自給自足型溶融塩高速炉の特性

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  • Performances of Molten-Salt Fast Reactor with Self-Sustainability
  • ジキュウ ジソクガタ ヨウユウエン コウソクロ ノ トクセイ

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<p>　A study is performed on a molten salt fast reactor (MSFR) of 1.5 GWe output. The reactor is started up by using transuranium elements reprocessed from spent fuel of a BWR. The fuel salt of the reactor is the mixed fluoride salt NaF–KF–UF4–TRUF3, which is reprocessed almost continuously by an oxide-precipitation process during the reactor operation. By performing calculations using the nuclear analysis code PIJ–BURN in SRAC2006 and the nuclear data file of JENDL–3.3, the following results are obtained. (1) The burn-up characteristics of the reactor are mainly determined by the uranium inventory (Uinv) in the reactor and the reprocessing cycle (Lrep), which is the time interval necessary to reprocess all the fuel salt in the primary loop. (2) A large Uinv and short Lrep enhance the breeding performance of the reactor. (3) The period necessary to keep the radioactive waste under control will be about 400 years in the case of Lrep longer than 400 efpd. (4) Power stations consisting of 20 MSFRs (total output of 30 GWe) can operate for 600 years by utilizing 14,000 t of uranium obtained from the spent fuel of LWRs in Japan.</p>

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