Objectives and status of the oecd/nea sub-group on uncertainty analysis in modelling (uam) for design, operation and safety analysis of sfrs (sfr-uam)

G. Rimpault (1) , L. Buiron (1) , N. Stauff (2) , Tk. Kim , Ta. Taiwo , Yk. Lee (1) , A. Aures (3) , F. Bostelmann (3) , E. Fridman , A. Kereszturi , B. Batki , Ia. Kodeli , K. Mikityuk (4) , R. Lopez , A. Gomez , F. Puente-Espel , E. del Valle , A. Peregudov , M. Semenov , G. Manturov , Y. Nakahara (5) , J. Dyrda (5) , . Ivanova T

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 ANL - Argonne National Laboratory [Lemont]
3 GRS
4 PSI - Paul Scherrer Institute
5 NEA - National Environment Agency [Singapore]

An OECD/NEA sub-group on Uncertainty Analysis in Modelling (UAM) for Design, Operation and Safety Analysis of Sodium-cooled Fast Reactors (SFR-UAM) has been formed under the NSC/WPRS/EGUAM and is currently undertaking preliminary studies after having specified a series of benchmarks. The incentive for launching the SFR-UAM task force comes from the desire to utilize current understanding of important phenomena to define and quantify the main core characteristics affecting safety and performance of SFRs. Best-estimate codes and data together with an evaluation of the uncertainties are required for that purpose, which challenges existing calculation methods. The group benefits from the results of a previous Sodium-cooled Fast Reactor core Feed-back and Transient response (SFR-FT) Task Force work under the NSC/WPRS/EGRPANS.Two SFR cores have been selected for the SFR-UAM benchmark, a 3600MWth oxide core and a 1000MWth metallic core. Their neutronic feedback coefficients are being calculated for transient analyses. The SFR-UAM sub-group is currently defining the grace period or the margin to melting available in the different accident scenarios and this within uncertainty margins.Recently, the work of the sub-group has been updated to incorporate new exercises, namely, a depletion benchmark, a control rod withdrawal benchmark, and the SUPER-PHENIX start-up transient. Experimental evidence in support of the studies is also being developed.

Mots clés: SFR; uncertainties; OECD benchmark; reactivity coefficients

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

G. Rimpault, L. Buiron, N. Stauff, Tk. Kim, Ta. Taiwo, et al.. Objectives and status of the oecd/nea sub-group on uncertainty analysis in modelling (uam) for design, operation and safety analysis of sfrs (sfr-uam). International Conference on Fast Reactors and Related Fuel Cycles (FR - 2017), Jun 2017, Kyoto, Japan. ⟨hal-02419676⟩