[2H01-05] Molten Salt Reactor 1

[2H04] Feasibility Study of Integral Molten Chloride Salt Fast Reactor (III)

(4) Burn-up characteristics of a small molten-salt fast reactor

*Koshi Mitachi¹, Yoichiro Shimazu¹ (1. Beyond Energy Research & Development Association)

Keywords:molten salt fast reactor, chloride salt, Trans Uranium Elements, U-Pu fuel cycle

Burn-up characteristics of a small molten salt fast reactor (SMSFR) of 700MWth output was studied to utilize Trans Uranium Elements (TRU) and depleted uranium (U) effectively. The fuel salt used is a mixed salt of NaCl, CaCl₂, UCl₃ and TRUCl₃. This fuel salt is expected to have solidification temperature of about 500C and heavy-elements (TRU+U) solubility of about 30mol%. According to the analysis of this study, the conversion ratio (= Pu production / Pu burning) of SMSFR is 0.57 when natural chlorine is used as the chlorine of fuel salt, but the conversion ratio is improved to 0.81 when Cl-37 is used. However, it has not reached the conversion ratio of 1.0 for the 2.2GWth molten chloride salt reactor published in the JNST last year. These burn-up characteristics of SMSFR were analyzed by SRAC2006 with SRACLIB-JDL40.