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Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design

WP1.5 Progress Meeting KTH / Stockholm, May 22-23, 2007. EUROTRANS – DM1. Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design. G. Bandini, P. Meloni, M. Polidori. Italian Agency for new Technologies, Energy and Environment, Advanced Physics Technology Division

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Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design

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  1. WP1.5 Progress Meeting KTH / Stockholm, May 22-23, 2007 EUROTRANS – DM1 Preliminary T/H Analyses for EFIT-MgO/Pb Reactor Design G. Bandini, P. Meloni, M. Polidori Italian Agency for new Technologies, Energy and Environment,Advanced Physics Technology Division Via Martiri di Monte Sole 4, 40129 Bologna, Italy

  2. Objectives Support the design phases of EFIT reactor with safety analysis at nominal and accidental conditions starting from: development of a Neutronic/Thermal-Hydraulic coupled model of EFIT Subcritical Reactor for PARCS v1.01 /RELAP5 3.2.2b code, just widely used in PDS-XADS project adaptation of the model for the new versions of the codes to take advantage of the multigroup diffusion equation solution in hexagonal geometry of PARCS v2.4 and the upgrade at the RELAP5 mod3.3 EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  3. Target Inner Fuel Middle Fuel Outer Fuel Box Dummy EFIT Core Section • Target Unit 19 Central Positions • Active Zone Positions 180 • Inner Zone 42 FA • Intermediate Zone 66 FA • Outer Zone 72 FA • Reflector Zone 252 Positions • For Dummy Assemblies and Absorber Elements EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  4. Neutronic Design EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  5. RELAP5 Model of EFIT Core Inner, Mid, Outer zones and dummy+bypass are representedAverage and hot hydraulic channel for Inner, Middle and Outer core with equivalent flow area coupled with corresponding pin heat structuresThe hydraulic channels are chocked to correctly distribute mass flowrateAverage pin, hot SA and hot pin modelled with 12 axial nodes to simulate axial and radial power distributionCERCER Fuel properties for Inner (57%MgO 43%MOX), Middle and Outer (50%MgO 50%MOX) are consideredCladding material is a ferritic-martensitic steel (T91) with aluminium coatingGap conductivity tuned with SIM-ADS codeLead heat transfer coefficient Subbotin correlation EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  6. Upper Branch Reflector/Bypass Avg. Outer Zone Avg. Inner Zone Avg. Mid Zone Hot Outer Zone Hot Inner Zone Hot Mid Zone Lower Branch tmpdjun RELAP5 Nodalization Scheme of EFIT Core AREVA Lyon October 10-11 , EUROTRANS – DM 1 - WP 1.5 Progress Meeting EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  7. Three Zone Core Main Parameters AREVA Lyon October 10-11 , EUROTRANS – DM 1 - WP 1.5 Progress Meeting EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  8. RELAP5 Calculations Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions. Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions. EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  9. Steady State at ERANOS Nominal Conditions (*) At max linear power elevation (**) At max core elevation EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  10. SS ERANOS Nominal Conditions – Inner Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  11. SS ERANOS Nominal Conditions – Mid Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  12. SS ERANOS Nominal Conditions – Outer Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  13. RELAP5 Calculations Steady state calculation at ERANOS Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin not simulated, - BOC conditions. Steady state calculation at MCNPX Code nominal conditions:- Axial and Radial Form Factor simulated,- 100% Power and Mass Flowrate, - Hot Pin simulated, - BOC conditions. EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  14. Steady State at MCNPX Nominal Conditions (the whole Power generated in fuel pellets) (*) At max linear power elevation (**) At max core elevation EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  15. SS MCNPX Nominal Conditions Inner Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  16. SS MCNPX Nominal Conditions Mid Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  17. SS MCNPX Nominal Conditions Outer Zone EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

  18. Steady State at MCNPX Nominal Conditions (in the hotpin only the Power generated in pellets) (*) At max linear power elevation (**) At max core elevation EUROTRANS-DM1 – WP1.5 Progress Meeting KTH - Stockholm, May 22/23 2007

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