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Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA)

EUROTRANS DM1 Safety Meeting 27-28 November, 2008 FZK , RFA. Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA) Cadarache Center gerald.rimpault@cea.fr. He-EFIT Core Neutronic characteristics (25/11/08)

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Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA)

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  1. EUROTRANS DM1 Safety Meeting 27-28 November, 2008 FZK , RFA Safety coefficients and sub-criticality levels EFIT and XT-ADS Gérald Rimpault, Commissariat à l’Energie Atomique (CEA) Cadarache Center gerald.rimpault@cea.fr CEA/DEN/DER Gérald Rimpault

  2. He-EFIT Core Neutronic characteristics (25/11/08) Results with ERANOS2.1 using JEFF3.1 Gérald Rimpault, Julian Murgatroyd, Frédéric Jean CEA/DEN/DER Gérald Rimpault

  3. He-EFIT Core Lay out CEA/DEN/DER Gérald Rimpault

  4. New Core Design – Detailed Characteristics (1/2) CEA/DEN/DER Gérald Rimpault

  5. New Core Design – Detailed Characteristics (2/2) • Under nominal conditions : • Large Margins on cladding temperature (120O °C under normal operating conditions) • Fuel max. temperature (1380 °C) respect the design criteria • To be cross-checked with CATHARE CEA/DEN/DER Gérald Rimpault

  6. IHX Design Blowers Design Decay Heat Removal Systems CEA/DEN/DER Gérald Rimpault

  7. Justification of He-EFIT operation reactivity CEA/DEN/DER Gérald Rimpault

  8. He-EFIT Feedback coefficients Axial expansion coefficient takes into account axial expansion and “doppler structure” effects. All feedback coefficients are negative except for the axial expansion coefficient which is positive (SiC cladding). Expansion of PuMAO2 much bigger than SiC in the temperature ranges of the system: Fuel expansion superseeds SiC axial expansion CEA/DEN/DER Gérald Rimpault

  9. XT-ADS CL-P0 Core Neutronic characteristics (13/11/08) Results with ERANOS2.1 using JEFF3.1 Gérald Rimpault, Frédéric Jean Two XT-ADS data (CL-P0 Core) cores : BOL Core : 68 S/A, Pth = 57 MW BOC Core : 75 S/A, Pth = 57 MW CEA/DEN/DER Gérald Rimpault

  10. XT-ADS CL-P0 BOL Core : 68 S/A, Pth = 57 MW, Fresh Core CEA/DEN/DER Gérald Rimpault

  11. XT-ADS CL-P0 BOC Core : 75 S/A, Pth = 57 MW, Equilibrium Core CEA/DEN/DER Gérald Rimpault

  12. XT-ADS CL-P0 Core Neutronic characteristics (13/11/08) • XT-ADS data (CL-P0 Core) : Values at Room Temperature i.e. 20°C d(U,Pu)O2 at 20°C = 10,55 g/cm3 (porosity = 0,9485) • XT-ADS data (CL-P0 Core) : Operating temperatures • K-Effective CEA/DEN/DER Gérald Rimpault

  13. XT-ADS data (CL-P0 Core) from room (20°C) to Operating temperatures: • Material densities : • Expanded Dimensions CEA/DEN/DER Gérald Rimpault

  14. Feedback coefficients : Theory Doppler effect Absorption and fission resonance widening. Fuel expansion Axial expansion Sodium expansion Spectrum effect + Leakage effect + Capture Steel expansion Axial expansion + Radial expansion Diagrid effectDiagrid expansion Differential expansionCore, vessel, rods expansion CEA/DEN/DER Gérald Rimpault

  15. XT-ADS Core BOL (68 S/A) Feedback calculations results (linked / not linked) : CEA/DEN/DER Gérald Rimpault

  16. XT-ADS Core BOC/EOC (75 S/A) Feedback calculations results (linked) : CEA/DEN/DER Gérald Rimpault

  17. XT-ADS Core BOL (68 S/A) and BOC/EOC (75 S/A) Feedback coefficients calculation : Gert currently checking his results for Axial Expansion CEA/DEN/DER Gérald Rimpault

  18. XT-ADS Core BOL (68 S/A) Reactivity void effects : CEA/DEN/DER Gérald Rimpault

  19. XT-ADS Core BOL (68 S/A) keff safety limits calculation (not linked) : CEA/DEN/DER Gérald Rimpault

  20. Pb-EFIT CERCER Core Neutronic characteristics (26/11/08) Results with ERANOS2.1 using JEFF3.1 Gérald Rimpault, Frédéric Jean CEA/DEN/DER Gérald Rimpault

  21. Pb-EFIT CERCER Core BOL Reactivity void effects : CEA/DEN/DER Gérald Rimpault

  22. Pb-EFIT Core keff safety limits proposal from ANSALDO CEA/DEN/DER Gérald Rimpault

  23. Pb-EFIT CERCER Core keff safety limits results Maximum value => enveloppe case Pb plays a shock absorber role Need to be discussed Under revision with 380°C as « Hot zero power temperature » CEA/DEN/DER Gérald Rimpault

  24. Pb-EFIT CERCER Core Feedback Coefficients Coolant expansion under scrutiny (core, reflector, density, expansion coefficient…) Massimo Sarotto made the calculation with a variation of 10% in Pb density, only in the active zone. That accounts for -48 pcm/ % density. CEA/DEN/DER Gérald Rimpault

  25. Extra Viewgraphs CEA/DEN/DER Gérald Rimpault

  26. Feedback coefficient calculations • Références:Notes techniques CEA: M.Vanier, JC Klein (SMFR) Thèse CEA Na Byung Chan, 1996 • Doppler effect : • Others feedback : linear variation : • Coolant expansion : CEA/DEN/DER Gérald Rimpault

  27. Feedback coefficient calculations • Steel expansion: Axial: Radial: • Fuel expansion: i = Fuel if not linked, i = steel if linked • Diagrid effect: CEA/DEN/DER Gérald Rimpault

  28. Feedback calculation method : CONDITIONS_DE_FONCTIONNEMENT MILIEU (EDL_MILSTD) REFERENCE_UNIT 'BBL_REF' DILATATION RADIALE 400.0 'MSTRU' AXIALE 350.0 'MSTRU' CALCUL LIE TEMPERATURE COMBUSTIBLE 875.0 FERTILE 384.0 STRUCTURE 384.0 CALOPORTEUR 350.0 ABSORBANT 384.0 Radial expansion (400°C  200°C) Axial expansion (350°C  200°C) Linked/not linked calculation Fuel expansion (875°C  200°C) Axial expansion (384°C  200°C) Coolant expansion (350°C  200°C) ECCO calculation : CELLULE 'CCOMB' EDITION MINI 'ASSEMBLAGE COMBUSTIBLE 1 INITIAL' TEMPERATURE 1 (TSTRU) 2 (TSTRU) 3 (TCALO) 4 (TCOMBDOP) 5 (TCOMBDOP) 6 (TSTRU) 7 (TSTRU) 8 (TCALO) 9 (TCALO) 10 (TSTRU) 11 (TCALO) Doppler (TCOMBDOP = 200°C) CEA/DEN/DER Gérald Rimpault

  29. XT-ADS Core BOL (68 S/A) Feedback coefficients calculation : Adding steel Doppler, Linked value become -0,673 Gerthas found -0.93 and iscurrently checking his results for Axial Expansion CEA/DEN/DER Gérald Rimpault

  30. Pb-EFIT CERCER core inner core: 42 assemblies;intermediate core: 66 assemblies; outer core: 72 assemblies, CEA/DEN/DER Gérald Rimpault

  31. Pb-EFIT CERCER core towards CERMET Core A Proposal CEA/DEN/DER Gérald Rimpault

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