Review of Fast Reactor Program in Japan; Prepared for IAEA/IWGFR 19th Annual Meeting

Matsuno, Yoshiaki

This report covers the activities of the experimental fast reactor JOYO from April 1985 to March 1986. After completion of the 7th duty cycle operation at the end of March 1985, special operation was carried out for the in-vessel performance test of the failed fuel detection and location system(FFDL)by ir-radiating slitted pins, natural circulation test from 30 MWt, and in-core measure-ment of coolant flow rate of each core subassembly during April 1985. The 5th annual inspection was carried out from the end of April 1985 to the beginning of December 1985, including disassembly and inspection of the double rotating plugs. Works for modification of the plant were done on such system as the control panel of the reactor protection system in order to enable inspection of the scram circuit during reactor operation, exchange of the cool-ing towers for the auxiliary service system and ventillation system, liquid waste processing system, and replacement of one of the in-vessel sodium level