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VVER-440 with IMF safety analysis of control rod ejection

VVER-440 with IMF safety analysis of control rod ejection. Petr DAŘÍLEK, Ctibor STRMENSKÝ, Radoslav ZAJAC, Jaroslav MAJERČÍK darilek@vuje.sk. AER Working Group F Meeting „Spent Fuel Transmutations“ Konferenční centrum AV ČR – zámek Liblice, Czech Republic April 2 6-29 , 20 11.

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VVER-440 with IMF safety analysis of control rod ejection

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  1. VVER-440 with IMFsafetyanalysisofcontrol rod ejection Petr DAŘÍLEK, Ctibor STRMENSKÝ, Radoslav ZAJAC, Jaroslav MAJERČÍKdarilek@vuje.sk AER Working Group F Meeting „Spent Fuel Transmutations“ Konferenční centrum AV ČR – zámek Liblice, Czech Republic April 26-29, 2011 VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  2. Content • VVER-440 fuel cycle with CFA • Full core evaluation • Control rod ejection • Conclusion VUJE , Inc., Okružná 5, SK 918 64 Trnava, Slovakia

  3. Pu - all isotopes * 5,0 % 440 - IMF VVER S UOX Reprocessing T Fabrication (IMF/UOX core) O R U FP A 0.1 % MA UOX VVER 440 - G IMF 0.1% Pu Fabrication (UOX core) E URT 0.1% U 4.87 % U - 235 Waste Enriched U * - mass concentration of Pu in mixture of PuO2 with Mo VVER-440 fuel cycle with CFA VVER-440 (self-cleaning) partially closed fuel cycle with IMF VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  4. VVER-440 fuel cycle with IMF • Full core evaluation • Control rod ejection • Conclusion VUJE , Inc., Okružná 5, SK 918 64 Trnava, Slovakia

  5. VVER-440 fuel cycle with CFA Fuel loadingpattern of CFA - BOC VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  6. VVER-440 fuel cycle with CFA Fuel loading assortment with CFA VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  7. Full core evaluation Critical boric acid concentration and group VI. position during the cycle VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  8. Full core evaluation Reactivity coefficients during the cycle VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  9. Full core evaluation Effective fraction of delayed neutrons Average neutron lifetime Efficiency of ejected control rod (peripheral group No6 rod, N=0%, TM=260° C) VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  10. Full core evaluation Fuel cycle parameters and indicators VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  11. VVER-440 fuel cycle with IMF • Full core evaluation • Control rod ejection • Conclusion VUJE , Inc., Okružná 5, SK 918 64 Trnava, Slovakia

  12. Control rod ejection Analysed cases VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  13. Control rod ejection Case A: Neutron power VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  14. Control rod ejection Case A: Fuel temperature VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  15. Control rod ejection Case A: Cladding temperature VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  16. Control rod ejection Acceptance criteria summary for U-pins (red – case maximum, dark red frame – criterion violation) Acceptance criteria summary for Mo-pins (* - limits for U-pins) VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

  17. VVER-440 fuel cycle with IMF • Full core evaluation • Control rod ejection • Conclusion VUJE , Inc., Okružná 5, SK 918 64 Trnava, Slovakia

  18. Conclusion • CFA (5% Pu): • equilibrium cycle with CFA’s too short • no problems at full core evaluation (stationary states) • two criteria were not fulfilled at one of four analysed cases of control rod ejection • Directions of problems solution: • higher Pu content → CFAI (10-14% Pu) • lower in-assembly power peaking → CFAI • reduction of ejected rod efficiency by core loading optimisation • specification of conservative ejected rod efficiency for cycles with CFAI’s • specification of conservative gas gap heat transfer coefficient VUJE , Inc., Okružná 5, 918 64 Trnava, Slovakia

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