Experimental fast reactor "JOYO" operation report; Operation results of secondary cooling system

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The secondary cooling system of Experimental Fast Reactor "JOYO" has been operated about for 52,000 hours as operation time since the initial sodium charge time in 1976 till the end of Reactor Run 6th 75MW in Dec., 1981. at the same time, the reactor has been operated about for 12,800 hours, the secondary pumps operated about for 40,000 hours and main blowers operated about for 10,000 hours. During the period we acquired some valuable operational experiences such as the motor brush's wear of the secondary main pump (A) and natual wear of main air coolers. But except them we could operate the system without severe problems. The report describes generally the operation and maintenance history of Secondary main pumps, the operation history of the main blowers and the temperature differences two IHX's of the secondary systems.