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Transients to be Analysed for the LBE–cooled XT-ADS and Lb–cooled EFIT designs

Transients to be Analysed for the LBE–cooled XT-ADS and Lb–cooled EFIT designs M. Schikorr (FzK) EUROTRANS-DM1-Safety Meeting Bruxells, 17 March 2006. Topics of this discussion: Types of Typical Plant Transient Initiators to be analyzed for the LBE / Lb – cooled ADS designs

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Transients to be Analysed for the LBE–cooled XT-ADS and Lb–cooled EFIT designs

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  1. Transients to be Analysed for the LBE–cooled XT-ADS and Lb–cooled EFIT designs M. Schikorr (FzK) EUROTRANS-DM1-Safety Meeting Bruxells, 17 March 2006 EUROTRANS DM1 Safety Bruxells, 17 March 2006

  2. Topics of this discussion: • Types of Typical Plant Transient Initiators to be analyzed for the LBE / Lb – cooled ADS designs 2. Summary of Results of the Transient Analyses of the 80 MW LBE – cooled XADS (ANSALDO Design) 3. List of Transients that were analyzed for the PDS-XADS 4. List of Transients to be analysed for XT-ADS and EFIT EUROTRANS DM1 Safety Bruxells, 17 March 2006

  3. 1. Typical Plant Transient Initiators for : - Protected case (with normal shutdown) and - Unprotected case (shutdown failure). 1. Loss of Flow (LOF) : pump failure 2. Loss of Heat Sink (LOH) : heat sink failure 3. Overpower Transient (TOP) : reactivity insertion 4. Loss of Coolant (LOCA) : primary system leak 5. Design specific transients : i.e. HX tube rupture, jet etc. EUROTRANS DM1 Safety Bruxells, 17 March 2006

  4. 2. Summary of XADS Safety Transient Analyses : 1. For the LBE-cooled 80 MWth XADS, as designed by ANSALDO, no transient could be identified that could lead to severe or catastrophic consequences. • For the worst combination of transients (ULOH+ULOF) the „grace“ time until excessive clad temperatures (> 1000 °C) are reached is between 30 and 60 minutes. 3. The dynamic response of the system is in general very benign to all transients considered, mainly due to it‘s : a. large heat sink / heat buffer capacitiy provided by the LBE coolant, and b. excellent natural convection characterisitics of the core/plant design (that is specfic to the Ansaldo XADS design !!!!) EUROTRANS DM1 Safety Bruxells, 17 March 2006

  5. 3a. List of Transients that were analyzed for the LBE-cooled 80 MW PDS-XADS (Ansaldo-Design) EUROTRANS DM1 Safety Bruxells, 17 March 2006

  6. 3b. List of Transients that were analyzed for the LBE-cooled 50 MW Myhrra (SCK-CEN Design) Source : D66 PDS-XADS EUROTRANS DM1 Safety Bruxells, 17 March 2006

  7. 3c. List of Transients that were analyzed for the Lb-cooled BREST Reactor Design Initiating events of ultimate accidents without scram (WS): EUROTRANS DM1 Safety Bruxells, 17 March 2006

  8. 3d. Preliminary List of Transients to be analyzed for the LBE- cooled XT-ADS Design. Preliminary List is currently defined as : EUROTRANS DM1 Safety Bruxells, 17 March 2006

  9. 3e. Preliminary List of Transients to be analyzed for the Lb-cooled EFIT Design. Preliminary List is currently defined as ! EUROTRANS DM1 Safety Bruxells, 17 March 2006

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