Summary of 75MW power ascension test of experimental fast reactor "JOYO"

Yamamoto, Hisashi*; Sekiguchi, Yoshiyuki*; Tamura, Seiji*; not registered; not registered; Sasaki, Makoto; not registered

The 75MW power ascension test of "JOYO" was started in July, 1979, followed by the successful 50MW power ascension test and two cycles of rated power operations. In the 75MW test reactor power was raised up to 65MW at first in order to confirm the characteristics of the plant stability and safety. On July 16th, 1979, the reactor out put reached the rated power of 75MW for the first time. Through the tests for the core, plant it self, radiation shield and plant monitoring, the results proved satisfactory operation characteristics at 75MW. The power ascension test was completed, except for the 100 hour nominal power continuous operation which is scheduled in January, 1980. This report presents the summary of the main results obtained in the test conducted untill August 1979.