Measures to meet new regulations for restart and the irradiation capability of Joyo

Itagaki, Wataru  ; Saito, Hiroto; Yamamoto, Masaya; Takamatsu, Misao ; Maeda, Shigetaka   

JAEA applied for inspections of Joyo under the new regulation on March 30, 2017. It is undergoing NRA's safety review against core modification to MK-IV 100 MW irradiation core, measurement to natural disaster and BDBAs. The MK-IV core will have the maximum fast neutron flux (E 0.1 MeV) of 10 n/cms. This is a high-level fast neutron flux of the irradiation test facilities in the world. Joyo can further enhance its capabilities by tailoring neutron spectrum, decreasing or increasing the irradiation temperature. For an experiment, it is important to evaluate neutron flux, dpa and temperature. Joyo provides accurate evaluation of irradiation conditions based on calculations verified by previous characterization tests and measurement using dosimetry technique. In this presentation, measure to new regulation, schedule for restart and irradiation capability of Joyo are introduced.