Start up test of expeimental fast reactor "JOYO"

Yamamoto, Hisashi*; not registered; Hirose, Tadashi*; Sanda, Toshio*; not registered

On April 24th, 1977, the initial criticality of JOYO was achieved and on July 5th, 1978, the reactor output reached rated power of 50 MW for the first time. The testing was conducted as criticality test, low power test and power raise test, through the testing about 40 different test items were conducted to assure characteristics of both reactor core and plant system. All tests were conducted as scheduled, and completed on September 16th, 1978. Results of the tests proved that JOYO is operated at 50 MW with safe and stable characteristics. This report presents brief description of test results from the initial criticality through the power up test.