Experimental fast reactor "JOYO" operation report; Operation experience of auxiliary core cooling system

not registered; not registered; not registered; not registered; not registered; not registered; not registered

This report presents an operation experience of the auxiliary cooling system from January, 1982 to September, 1986. Outline of the operation experience is following ; (1)There has not been any serious trouble on the primary auxiliary cooling system in the term. Operation time of the primary auxiliary cooling system to remove reactor core residual heat during the reactor shut down outage (refueling outage) was about 3400 hours. The primary auxiliary circulating pump has been automatically started 65 times on the scheduled tests. Total operation time of the primary auxiliary cooling system was about 3900 hours after initial sodium filling of the cooling system. (2)Operation time of the secondary auxiliary cooling system with 100% flow rate was about 34000 hours. The secondary auxiliary circulation pump was tripped 11 times during about 34000 hours operation by; (a)Loss of commercial power and various tests, -10 times (b)High temperature of circulation pump coil, - 1 time. High temperature of circulation pump coil was caused by loss of cooling air with the obstacles in the cooling pump filter in May, 1982. This caused no influence to the plant at that time since the reactor decay heat had been sufficiently cooled down. The secondary auxiliary cooling system has been in no trouble except for the trip by high temperature of circulation pump coil. Total operation time of the secondary cooling system after initial sodium filling of the system was about 73000 hours.