Experimental fast reactor "JOYO" operational test; Temperature distribution test of rotating plugs

not registered; not registered; not registered; Inoue, Teruji*; not registered; not registered; not registered

The reactor power of the Experimental Fast Reactor Joyo was raised to 50 MW in July, 1978 and then to 75 MW in July, 1979. This report discribes the temperature distributions of the rotating plugs of Joyo measured from April, 1978 through December, 1981. The following results were obtained. (1)The overall temperature distributions of the large rotating plug the samll rotating plug, and the upper-core-structure have a tendency to become higher in this order and become steady state within about a week. (2)The temperature distributions of the rotating plugs have no tendency to change periodically within either a few days or longer period, and unusual temperature distributions due to imbalanced sodium vapor deposition have not been detected.