Improvement of the experimental validation of the DARWIN code system due to the JEFF3.1 library for UOX spent fuel inventory and decay heat calculation - synthesis of the tendencies obtained with theMALIBU international benchmark and the French Post-IrradiationExamination database.

摘要

This paper deals with the experimental qualification of the French package DARWIN for the PWR UOX fuel inventory calculation, focused on the isotopes involved in Burnup Credit (BUC) applications and decay heat calculation. The calculation - experiment (C/E-l) discrepancies are calculated with the latest European Evaluation File JEFF3 associated with the SHEM energy mesh, and compared with the previous results obtained with JEF2.2. An overview of the tendencies for the JEFF3 / JEF2 comparison is obtained on a complete range of burnup from 10 to 70 GWd/t, from the French Post Irradiation Examination (P.I.E.) database and the experimental results obtained in the framework of the international benchmark MALIBU. For the most previously unsatisfactory isotopes (236U, 242Pu/243Am, 143Nd, ""•150' 152Sm, 155Gd and 153> 154> 155Eu), the (C/E-l) trends are considerably reduced. Uncertainty on decay heat calculation is systematically reduced with JEFF3, especially for short and very long cooling time, up to 40 % compared to JEF2.2