JOYO MK-III performance test

Sekine, Takashi ; Maeda, Yukimoto; Aoyama, Takafumi ; Ariyoshi, Masahiko

The MK-III upgrading project was completed in the experimental fast reactor JOYO to increase irradiation capability for irradiation tests. After modification work of cooling system, the system function tests were carried out between August 2001 and March 2003. As a result of these tests, it was confirmed that the performance of whole plant included the modified components, which were the intermediate heat exchanger (IHX) and the dump heat exchanger (DHX) etc., was satisfied with the design. The performance tests were carried out from June 2003 as the last phase of MK-III modification work. During the performance tests, the reactor power was raised step by step as 20%, 50%, 75%, 90% and 100% (140MWt), while confirming the nuclear and thermal characteristics of MK-III core and the heat removal capability of IHX and DHX. All performance tests was successfully carried out and it was confirmed that the performance of JOYO MK-III plant was satisfied with the design. Certificate of pre-use inspection about JOYO MK-III was conferred from Ministry of Education, Culture, Sports, Science and Technology in 27th November 2003 and the MK-III modification work was completed. This report shows the results of the system function tests and the performance tests of JOYO MK-III.