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TRU GENERATION SUPPRESSION BY HALEU FUEL WITH FIXED DISCHARGE BURNUP USING BURNABLE POISON

2023; Japan Society Mechanical Engineers; Volume: 2023.30; Linguagem: Inglês

10.1299/jsmeicone.2023.30.1546

2424-2934

Kouji Hiraiwa, Rei Kimura, Satoshi Wada, Tsukasa Sugita, Kenichi Yoshioka, Satoshi Takeda, Takanori Kitada,

Nuclear reactor physics and engineering

Effects of burnable poison (BP) addition on radiotoxicity by TRU were investigated for FORSETI fuel, which is assumed to be loaded into a BWR plant. Since the purpose of this study was to confirm the relative change in radiotoxicity due to TRU, the weight ratio of TRU was used as an index of the relative magnitude of radiotoxicity. The weight fraction of TRU nuclides with 235U enrichment from 3.8 wt% to 20 wt% was examined with and without BP. The weight fraction of TRU nuclides in the spent fuel decreased by about 60% for 238Pu, 240Pu, and 241Pu. The results of these nuclides are almost the same between with and without BP. On the other hand, 239Pu, which is not dominant in the toxicity of TRU, is slightly increased by the addition of BP. The relative difference in TRU weight fraction between with-BP and without-BP by increase of 235U enrichment does not exceed 20wt% except for 239Pu.It is desirable to consider the error in the amount of TRU generation when evaluating without BP for analytical simplicity.