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criticality

SCALE 5.1 - criticality and inventory calculation for VVER-440 fuel Vladimír Chrapčiak, VUJE, a.s. Radoslav Zajac, VUJE, a.s. criticality. experimental , 297 cases for fresh UO2 fuel triangular pitch pitch: 1.1 up 2.598 cm (202 ~ 1.27 cm) enrich.: 2.0 up 4.742% U235 (254 ~ 3.6%)

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criticality

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  1. SCALE 5.1 - criticality and inventory calculation for VVER-440 fuelVladimír Chrapčiak, VUJE, a.s. Radoslav Zajac, VUJE, a.s. VUJE, Inc., Okružná 5, 918 64 Trnava

  2. criticality experimental, 297 cases for fresh UO2 fuel • triangular pitch • pitch: 1.1 up 2.598 cm (202 ~ 1.27 cm) • enrich.: 2.0 up 4.742% U235 (254 ~ 3.6%) • boron conc.: 0 up 7.2 g/kg (251 ~ 0 g/kg) 93 cases for fuel with Pu and SM numerical, 37 cases • pin • assembly • cask VUJE, Inc., Okružná 5, 918 64 Trnava

  3. criticality SCALE 5.1 • KENO VI (sequence CSAS26) • library 44GROUPNDF5 or 238GROUPNDF5 • NITAWL or CENTRM • total neutrons = 500 000 (fresh) or 1000 000 (Pu+Sm), 2000 per generation, 10 skipped generation VUJE, Inc., Okružná 5, 918 64 Trnava

  4. criticalityFig.1.1 Interval of deviation VUJE, Inc., Okružná 5, 918 64 Trnava

  5. criticalityFig.1.2 Histogram of Kef deviation for KENO VI, 297 experiments.2s = 0.0084 VUJE, Inc., Okružná 5, 918 64 Trnava

  6. criticalityFig.1.3 Histogram of Kef deviation for KENO VI, 96 experiments.2s = 0.0102 VUJE, Inc., Okružná 5, 918 64 Trnava

  7. criticalityFig.1.4 Histogram of Kef deviation for KENO VI, 37 cases CB1,3,4. VUJE, Inc., Okružná 5, 918 64 Trnava

  8. nuclide composition experimental • Novovoronezh 1, 12 samples, 11 actinides • Novovoronezh 2, 8 samples, 16 actinides + 32 FP (=ISTC 2670 project) numerical • CB2, 6 cases, 11 actinides + 15 FP VUJE, Inc., Okružná 5, 918 64 Trnava

  9. nuclide composition SCALE 5.1 • SAS2, ORIGEN-S, TRITON • library 44GROUPNDF5, vver440(3.6) VUJE, Inc., Okružná 5, 918 64 Trnava

  10. nuclide compositionFig.2.1 Deviation of nuclide concentration, Novovoronezh 1 (12 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  11. nuclide compositionTab.2.2a. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  12. nuclide compositionTab.2.2b. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  13. nuclide compositionTab.2.2c. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  14. nuclide compositionTab.2.2d. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  15. nuclide compositionTab.2.2e. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  16. nuclide compositionTab.2.2f. Deviation (%) of nuclide concentration, Novovoronezh 2 (8 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  17. nuclide compositionFig.2.3a Deviation (%) of nuclide concentration, CB2 (6 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  18. nuclide compositionFig.2.3b Deviation (%) of nuclide concentration, CB2 (6 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  19. nuclide compositionFig.2.3c Deviation (%) of nuclide concentration, CB2 (6 samples) VUJE, Inc., Okružná 5, 918 64 Trnava

  20. criticality fresh 2s = 0.0084 with Pu + Sm 2s = 0.0102 nuclide composition (CF) conclusion VUJE, Inc., Okružná 5, 918 64 Trnava

  21. conclusion The new SCALE 5.1 system has requested accuracy for VVER-440 fuel for criticality and inventory calculation for BUC application. Some nuclides (isotopes of Eu and Gd155) have extremely high deviation between measured and calculated concentration. The new tools TRITON and STARBUCS are very useful for safety analyses. VUJE, Inc., Okružná 5, 918 64 Trnava

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