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1. Upgrading the older generation: Bohunice Power Plant Imrich Krajmer, Kamil Libošvár Slovenské Elektrárne NPP Bohunice Technical Changes Department IAEA Regional Workshop on Modernization Projects of NPP Instrumentation and Control Systems Related to Power Uprates and Licence Renewals, Portorož 14-18.4.2008
2. Enel international presence*
3. Slovenské Elektrárne generation fleet We own an optimal production portfolio comprised of nuclear, thermal and hydroelectric power plants
The nuclear power plant Bohunice is located in Western Slovakia.
Electricity is generated here in two 440 MW units that had gradually been connected to the power network over the period between 1984 and 1985.
We own an optimal production portfolio comprised of nuclear, thermal and hydroelectric power plants
The nuclear power plant Bohunice is located in Western Slovakia.
Electricity is generated here in two 440 MW units that had gradually been connected to the power network over the period between 1984 and 1985.
4. Slovenské Elektrárne SE is the second largest utility company in the Central and Eastern Europe.
SE enjoys a strategically important position in the Slovak Republic’s power sector.
Investment plan: 2,7 billions € is a challenging investment program to be carried out inside outages constrains with the highest commitment on budget, timing, performances. Main projects: Bohunice upgrading, Vojany capacity enhancement, EMO 3-4
SE is the second largest utility company in the Central and Eastern Europe.
SE enjoys a strategically important position in the Slovak Republic’s power sector.
Investment plan: 2,7 billions € is a challenging investment program to be carried out inside outages constrains with the highest commitment on budget, timing, performances. Main projects: Bohunice upgrading, Vojany capacity enhancement, EMO 3-4
5. Bohunice nuclear power plant About V1: The construction in Jaslovské Bohunice began on 24 April 1972. Nuclear island is primarily by Russian technology and supplies with VVER reactors type 230; V1 Units were respectively put into trial operation on December 1978 and March 1980,.
About V2: the contraction started in 1976 and was completed in 1985; the VVER reactors are the 213 type with higher safety standards in comparison with the 230 type of V1.
About V1: The construction in Jaslovské Bohunice began on 24 April 1972. Nuclear island is primarily by Russian technology and supplies with VVER reactors type 230; V1 Units were respectively put into trial operation on December 1978 and March 1980,.
About V2: the contraction started in 1976 and was completed in 1985; the VVER reactors are the 213 type with higher safety standards in comparison with the 230 type of V1.
6. Upgrading of Bohunice
The upgradeability of VVER type reactors was proved as feasible in the 1990´s on the V1 plant.
As concerns V2, the upgrading is based on three main pillars:
the modernization
the power up-rate
the ageing monitoring program
I’m now going to share some more details on each of these three projects
The upgradeability of VVER type reactors was proved as feasible in the 1990´s on the V1 plant.
As concerns V2, the upgrading is based on three main pillars:
the modernization
the power up-rate
the ageing monitoring program
I’m now going to share some more details on each of these three projects
7. Upgrading: Modernization
8. Upgrading: ageing monitoring Equipment qualification The third pillar of the upgrading of Bohunice V2 power plant is the ageing monitoring which is a first step of a wider Lifetime Extension project.
The main goals of the ageing monitoring programme are:
A safe and reliable operation of the power plant
The minimization of the unavailability
The proper maintenance or refurbishment of SSCs (systems, structures and components)
To prepare reliable basis for the lifetime extension of the power plant beyond design data
Lifetime evaluation of main primary components is carried out regularly, after each fuel campaign, for the following components:
Reactor Pressure Vessel,
Steam Generator,
Pressuriser,
Reactor Coolant Pump,
Main Isolation Valve,
Primary Piping (Main Circulation Pipeline),
Pressuriser Piping including Effect of Stratification.The third pillar of the upgrading of Bohunice V2 power plant is the ageing monitoring which is a first step of a wider Lifetime Extension project.
The main goals of the ageing monitoring programme are:
A safe and reliable operation of the power plant
The minimization of the unavailability
The proper maintenance or refurbishment of SSCs (systems, structures and components)
To prepare reliable basis for the lifetime extension of the power plant beyond design data
Lifetime evaluation of main primary components is carried out regularly, after each fuel campaign, for the following components:
Reactor Pressure Vessel,
Steam Generator,
Pressuriser,
Reactor Coolant Pump,
Main Isolation Valve,
Primary Piping (Main Circulation Pipeline),
Pressuriser Piping including Effect of Stratification.
9. NPP V2 Bohunice - THE POWER UPRATE THE POWER UPRATE ist performing on two steps :
Increase of secondary equipment efficiency
Increase of Reactor thermal power up to 107 %
The target ist increasing the unit electric power from real achieved 425 MWe to minimum on 490 MWe
The order how achieving this target status :
The achiev design electrical power 440MWe improvement efficiency of the thermal cycle:
with changes on the Main condensers
Two condensers out of four are already in operation after up-rating modifications
With modifications on The Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
with the changes measuring jet decreasing losses of the pressure on the steam lines betwin SG and TG accessories
10. NPP V2 Bohunice - THE POWER UPRATE THE POWER UPRATE ist performing on two steps :
Increase of secondary equipment efficiency
Increase of Reactor thermal power up to 107 %
11. Power uprate NPP V2 and new typ of fuel Gd II This changes results in better nuclear fuel cycle economy and reduction of neutron flux on reactor vessel.
The new typ of fuel Gd II was start change in 2006 on both units.
The close changes of fuel cycle is expected in connection with increase of the reactor power:
-104% (2008 3.unit) wil be change in core 3/5 new fuel Gd II
-105%(2009 4.unit) wil be change in core 4/5 new fuel Gd II
-107%(2010 3 and 4. unit).
The close changes of the fuel cycle in Bohunice V-2 NPP is expected in connection with increase of the reactor power to 107% in 2010
- Choice of supplier and fuel licensing took aproximately four years.
- Diferencies between theoretical(BIPR7) and experimental values measured during physical start-up are not significant.
- Diferencies between theoretical(BIPR7) and „experimental“(SCORPIO-MOBYDICK) values are not significant up to the moment.
12. NPP V2 Bohunice - THE POWER UPRATE The thermal power reactor increasing on 104% Nnom
The the thermal power improvement efficiency will be achieved with the next changes:
The Turbines HP and LP
Generators and their auxiliary systems
The first generator replacement is planned during the general outage this year
The units transformes and accessories
The thermal power increasing on 107% Nnom
The time Schedule
13. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
14. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
15. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
16. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
17. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
18. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
19. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
20. Power up-rate Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
Actions planned on primary and secondary systems to create the technical conditions for power uprate:
Implementation of calibration systems for a more accurate reactor power control in terms of temperature and neutron flux
Upgrade of turbines:
High Pressure part
Modification of external casing
Replacement of inner casing and diaphragms in the stator
Replacement of rotors
Modification of shaft seals
Modification of inlet steam control valves
Low Pressure part
Modification of inner casing in the stator
Replacement of diaphragms in the stator
Replacement of rotors
Replacement of shaft seals
We are going to replace most of the inner components of the original equipment
Main condensers
Two condensers out of four are already in operation after up-rating modifications.
General arrangement was changed into a modular, complete retubing was performed, water chambers were reinforced and original springs were readjusted in order to compensate higher weight of condensers after modification
Cooling towers
All 4 cooling towers are nowadays in operation after replacement of the cooling system. Preliminary measurements confirmed increased efficiency of cooling
Generators
The first generator replacement is planned during the general outage this year.
The complete scope of work is the following:
Stator
Modification of external frame
Replacement of internal frame
Stator rewinding
Rotor
Rotor rewinding
Replacement of rings and keys
Accessories
Empowerment of cooling systems
New diagnostic system
Unit transformer
Original soviet type transformers will be modified (3 over 4 in operation) and a new one will be purchased.
Scope of modification is:
Replacement of winding
Replacement of bushings
Replacement of cooling system
New diagnostics system
Connections to the grid must be modified in relation with the uprate of generator and unit transformers in the following extent:
Modification of encapsulated wires
Modification of power output connections to generator and to transformer
Replacement of generator disconnectors
Instrumentation and control system
Replacement of turbine and generator protection systems
Replacement of feed water flow meters in the SG to increase the precision of the measurement of reactor power output
Replacement of steam flow-rate sensors and installation of moisture separators in the secondary circuit
Replacement and functional enlargement of automatic regulation system of turbine (the old system was hydraulic, the new one will be electronic)
Upgrading of instrumentation and automatic controllers both in the primary and secondary circuit
21. Power uprate and the safety analysis The results of the safety analysis showed, that the NPP V2 units with new and modified safety systems (mechanical, electrical and I&C) are to be able manage all of the designing initial events for the power of reactor increasing on 107% Nom.
Ongoing activities ending 2008:
The PSA study level 1. and 2 will be updated on the power of reactor increasing on 107% Nom
Will be worked analysis of the behaviour of the unit during severe accident after power uprate on 107%Nnom
Will be worked the specific structrual analysis of the integriti hermetic area during condition the severe accident
Will be worked the analysis on the degradation leakage Ra – materials to environtment
22. Power uprate and the safety analysis
Evaluation of potential change in radioactive releases within LOCA and under operation on uprated power level –Intention and Report on Power Uprate environmental influence
Computational analyses of severe accidents influenced by unit uprated power;
Strength calculations in order to verify applicability of technological systems under operation on uprated power level
Programs, inspections and tests necessary to perform after power uprate
List of updated documents, operating procedures and personnel training related to Power Uprate
Quality assurance system within Power Uprate implementation
23. Supporting documentations for power uprate: The Safety Concept (SC) for The V-2 NPP Upgrading and Safety Enhancement Programme, Task of modernization V9 – Power uprate – VÚJE Trnava, 2000
The Project Analys for The Power Uprate Units NPP V2 – VÚJE Trnava, 2005
The Final evaluation of the Nonstandart tests energy start up after the ending The modernization programme – VÚJE Trnava, 2007
The Uncertainty to estimate of the Reactor thermal Power, - VÚJE, 2007
The Methodics of measurement and determination of the Reactor thermal power and flow of the cooling water through the Reactor
24. Supporting documentations for power uprate: The account of the SG streghnt after the Power Uprate 109(107)% NPP V2 – ÚAM Brno, 2007
The acount on RPV, MCP and others equipment of primary after Power Uprate – ÚJV Rež, 2007
The Thermal – hydraulic analysis for the Power Uprate on 107 anad 109% NPP V2 – Energovýzkum, 2007
The Estimation of the impact the Power Uprate on on instrumentation seccondary part I&C, - ÚJV Rež, 2007
Measurement of fluid flow by means of pressure diferential devices inserted in circular – cross section conduits running full
The Estimation of the reserve sufficient of feed water systems on 107 and 109% Power level – EGP Praha, 2008
The acount estimate of secondary pipe lines and equipments after the Power Uprate on 107 and 109%NPP V2 – ÚJV Rež, 2007
Report on Evaluation Prepared by course of the Law of the National Council of SR on Environmental impacts evaluation, the number of 127 /1994 Coll. Power Uprate NPP V2, VÚJE – 2004
Bohunice 3&4 SAR Chapters 4 and 15 upgraded to 107 + 2% reactor power level
Chapter 4 (Reactor) within contract on fuel - TVEL company – April 2007
Chapter 15 (Safety Analyses) within contract with VUJE on MOD V2 General Contractor 2007
25. Upgrading: Power Up-rate As previously mentioned, the second lever of the upgrading of the Bohunice V2 power plant is the POWER UP-RATE.
The uprate project started in 2006 and will be completed by the end of 2010.
The benefits of this project in terms of capacity will be the achievement of additional total 122 MW both by the increase of capacity of the reactor (up to 107%) and the modifications of the following equipment:
Condensers
Cooling towers
Turbines
Generators
Unit transformers
The modification to the equipments are and will be performed enlarging planned ordinary outages optimized in such a way to reduce the loss of generation. As previously mentioned, the second lever of the upgrading of the Bohunice V2 power plant is the POWER UP-RATE.
The uprate project started in 2006 and will be completed by the end of 2010.
The benefits of this project in terms of capacity will be the achievement of additional total 122 MW both by the increase of capacity of the reactor (up to 107%) and the modifications of the following equipment:
Condensers
Cooling towers
Turbines
Generators
Unit transformers
The modification to the equipments are and will be performed enlarging planned ordinary outages optimized in such a way to reduce the loss of generation.
26. Expected power increase from the overall power up-rate
27. Project Management Model Slovenské Elektrárne acts as a General Contractor
A dedicated specific project team is in place with the strongest commitment to meet all deadlines without exceeding the planned budget and constantly meeting all safety and security requirements
A General Designer elaborates design, safety, quality and operational documentation
A large number of suppliers is managed and coordinated also in connection with planned outages (peak presence: 1250 external workers)
A big effort and commitment for the Slovak community (Slovenské Elektrárne and Slovak suppliers) supported by ENEL in a project of international importance
28. Upgrades: approach and decision levers Both Modernization and Uprate projects were/are/will be implemented during operation as far as possible and during planned outages - eventually extended – ensuring and increasing a full safe operation and without threatening the cash flow of the power plant
A close cooperation is in place with the Nuclear Regulatory Agency of the Slovak Republic regarding solutions approvals and permissions for the implementation phase
The power uprate project is a profitable project: the major modifications optimize the Net Present Value and set the stepping stone for lifetime extension
Both Modernization and Uprate projects are fully funded by SE own sources
