Experimental fast reactor "JOYO" operation test; Operation history of auxiliarry core cooling system

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Experimental Fast Reactor "JOYO" completed its 75MWt power operation with the Mark-I core (breeding core) in Dec., 1981. The Auxiliary Core Cooling System (ACCS) has been operated satisfactorily since the first sodium charge in Jan., 1977. This paper describes the operation history until the end of Mark-I Operation. (1)Accumulated operation time of Primary Auxiliary Cooling System with circulating pump on during outages for annual inspection or others was only 530 hours, while the rest being occupied by the counterflow from main circulating punps. Auxiliary circulating pump experienced the automatical start only when the reactor scrammed and reactor sodium level lowered because of the failure of overflow make-up pump in July, 1981. (2)Secondary auxiliary cooling system had been operated approximately 39,140 hours in full flow rate, meanwhile circulating pump failed 4 times because of power loss.