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L. Mansani mansani@nuc.ansaldo.it

L. Mansani mansani@nuc.ansaldo.it. EFIT Design. Core Section. Target Unit 19 Central Positions Active Zone Positions 222 Inner Zone 48 FA Outer Zone 174 FA Reflector Zone 210 Positions For Dummy Assemblies and Absorber Elements

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L. Mansani mansani@nuc.ansaldo.it

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  1. L. Mansani mansani@nuc.ansaldo.it EFIT Design

  2. Core Section • Target Unit 19 Central Positions • Active Zone Positions 222 • Inner Zone 48 FA • Outer Zone 174 FA • Reflector Zone 210 Positions • For Dummy Assemblies and Absorber Elements • 24-30 Dummy Positions can allocate FA for Core Design flexibility

  3. Fuel Assembly

  4. Lead flow-path during fuel handling Fuel Assembly Features (1/2) Wrapper thickness increased in the Active Core mid-plane (from 4 to 5 mm) Inlet Orifice

  5. Fuel Assembly Features (2/2) Positioning Device Type 1 Positioning Device Type 2 Locking Device Disengaged Locking Device Engaged

  6. Dummy Assembly

  7. Absorber Element

  8. Target: Main Constraints • Target Unit Type: • Windowless with Mechanical Pumps • Derived from PDS-XADS Design • Heat Sink below Free Level • Proton Beam: • 800 MeV; 20 mA • Proton Travel Depth in Lead about 43 cm • Deposited Power and Irradiation Damage: • 70% Proton Beam Power (11.2 MW) • Max dpa 100 to 130 • Max Coolant Velocity: • About 1 m/s (except around the pump impeller) • Low Pressure Losses • About 50÷60 kPa • Temperature: • Primary Coolant Inlet 400°C • Max Average Target Coolant 520°C

  9. Target Unit: Windowless Concept

  10. Target Unit: Main Thermo-hydraulic data Primary Pb Coolant inlet Temperature (°C) 400 Primary Pb Coolant outlet Temperature (°C) 450 Primary Pb d Coolant Flowrate (kg/s) 1500 Target Pb Coolant Cold Temperature (°C) 419 Target Pb Coolant Hot Temperature (°C) 515 Target Pb Coolant Flowrate (kg/s) 800 Target Extimated Pressure Loss (kPa) 50

  11. Target Pump Dimensions & Characteristics Pumps number 2 Casing ID diameter (mm) 303.5 Hub diameter (mm) 105 Blades number 3 Rated Flowrate (kg/s) 800 Pump Head (kPa) 300 Relative Pb Speed at Blade tip (m/s) 5.2 Rotational Speed (rpm) 320

  12. Target Heat Exchanger Dimensions & Characteristics Exchanged Power (MW) 11.2 Tube length (m) 1 Tube ID (mm) 10 Tube number 1378 Tube Pitch (mm) 16 Internal Shell OD (mm) 328 External Shell ID (mm) 760 Tube side Pb speed (m/s) 0.7 Shell side Pb Speed (m/s) 0.66

  13. Target Unit

  14. Reactor Block 1 Reactor Core 2 Active Zone 3 Diagrid 4 Primary Pump 5 Cylindrical Inner Vessel 6 Reactor Vessel 7 Reactor Cavity 8 Reactor Roof 9 Reactor Vessel Support 10 Rotating Plug 11 Thermal Shielding 12 Above Core Structure 13 Target Unit 14 Steam Generator Unit 15 Fuel Handling Machine 16 Filter Unit 17 Core Instrumentation 18 Rotor Lift Machine 19 DHR Dip Cooler

  15. Reactor Block 1 Reactor Core 2 Active Zone 3 Diagrid 4 Primary Pump 5 Cylindrical Inner Vessel 6 Reactor Vessel 7 Reactor Cavity 8 Reactor Roof 9 Reactor Vessel Support 10 Rotating Plug 11 Thermal Shielding 12 Above Core Structure 13 Target Unit 14 Steam Generator Unit 15 Fuel Handling Machine 16 Filter Unit 17 Core Instrumentation 18 Rotor Lift Machine 19 DHR Dip Cooler

  16. Reactor Block 1 Reactor Core 2 Active Zone 3 Diagrid 4 Primary Pump 5 Cylindrical Inner Vessel 6 Reactor Vessel 7 Reactor Cavity 8 Reactor Roof 9 Reactor Vessel Support 10 Rotating Plug 11 Thermal Shielding 12 Above Core Structure 13 Target Unit 14 Steam Generator Unit 15 Fuel Handling Machine 16 Filter Unit 17 Core Instrumentation 18 Rotor Lift Machine 19 DHR Dip Cooler

  17. Reactor Block 1 Reactor Core 2 Active Zone 3 Diagrid 4 Primary Pump 5 Cylindrical Inner Vessel 6 Reactor Vessel 7 Reactor Cavity 8 Reactor Roof 9 Reactor Vessel Support 10 Rotating Plug 11 Thermal Shielding 12 Above Core Structure 13 Target Unit 14 Steam Generator Unit 15 Fuel Handling Machine 16 Filter Unit 17 Core Instrumentation 18 Rotor Lift Machine 19 DHR Dip Cooler

  18. Primary System Main Process Parameters • Primary System Design Power (MW) 416 • Present Core Power (MW) 395 • Maximum Power from Spallation (MW) 11.2 • Primary System Flowrate (kg/s) 36000 • Primary Coolant Target Flowrate (kg/s) 1500 • Core Flowrate (kg/s) 34500 • Fuel Assembly Flowrate (kg/s) 33300 • Dummy Assemblies Flowrate (kg/s) 400 • Absorber Elements Flowrate (kg/s) 150 • Core Bypass Florate (kg/s) 650 • Nominal Core inlet Temperature (°C) 400 • Nominal Core outlet Temperature (°C) 480 • Primary Circuit Pressure Loss (kPa) 150÷200 • Core Pressure Loss (kPa) 100÷150 • SG Pressure Loss (kPa) 40 • Reactor Pressure (cover gas plenum) (MPa) 0.11

  19. Secondary System Main Process Parameters • Steam Pressure (MPa) 14 • Water/Steam Flowrate (kg/s) 257 • Feedwater Temperature (°C) 335 • Steam Temperature (°C) 450 • Steam Superheating (K) 116

  20. SG & Pump Group Number of SG & Pump Groups 4 Number of SGs per Group 2 Number of Pump per Group 1 Design Power per Group 104 MW Design Power per SG 52 MW Design Lead Flow per Group 9000 kg/s

  21. SG Main Dimensions (data of one SG)

  22. SG Main T/H Parameters (data for 1 SG of 52 MW)

  23. SG & Pump Group

  24. Primary Pump Dimensions & Characteristics Casing ID (mm) 850 Hub diameter (mm) 425 Blade number 4 Rated Flow-rate (kg/s) 9000

  25. Core Decay Heat

  26. 4 independent loops partially filled with organic, diathermic fluid (oil), that dissipate the decay heat to the atmosphere by natural convection circulation Oil boiling point determined by superimposed pressure of inert gas Each loop consists of a dip cooler (Decay Heat eXchanger, DHX) immersed in the cold pool, where the oil partially vaporizes, of an Air Vapor Condenser (AVC) with stack chimney and interconnecting piping Installed decay heat removal power 26.6 MW (6.67 MW per loop) Safety-related DHR System

  27. DHR Dip Cooler (DHX)

  28. DHR System: DHX (1/2) • There are 4 dip coolers (DHX), one for each DHR loop, located in the annular space between the cylindrical inner vessel and the Reactor Vessel • DHX is of cylindrical shape and oval cross section • Tube bundle is an array of 931 bayonet tubes, each ~3 m long, arranged on a triangular pitch of 40 mm • A bayonet tube consists of a pair of concentric tubes, the outer of which (ID=27 mm, 1.5 mm thick) has one end sealed • The tube-plate of the inner tubes (ID=18.3 mm,1.5 mm thick ) is welded to the inlet duct which is inside and concentric to the outlet duct

  29. DHR System: DHX (2/2) • Lead enters radially the DHX through a window provided in the cylindrical shell and leaves axially the DHX through the open bottom end of the shell • Each DHX is rated ~6.7 MW at DHR condition • Heat transfer takes place by partial vaporization of the diathermic fluid • At normal operating conditions it removes the heat losses from SGs and Inner Vessel (a few 100 kW) to keep cold (~400°C) the upper part of the reactor vessel

  30. DHR System Performances Normal Condition: All 4 Loops in Operation Degraded Condition: 3 Loops out of 4 in Operation Performance of One DHR loop at ~3 minutes (20 MW) and at ~ 1 hour (16 MW) after reactor shutdown Normal Degraded One DHR loop at steady-state 3m 1h 3m 1h • Oil Flow Rate (kg/s) 271 253 288 277 • DHX Oil Inlet Temperature (°C) 405 405 405 405 • DHX Oil Outlet Temperature (°C) 409 409 409 408 • AVC pressure in the (MPa, abs) 1.14 1.13 1.14 1.13 • Ratio of Critical to Rated Heat Flux 1.76 2.48 1.20 1.77 • Lead Inlet Temperature (°C) 448 441 451 444 • Lead Outlet Temperature (°C) 407 406 408 407 • Lead Flow Rate (kg/s) 848 786 1073 995

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