[2H14-18] Criticality Management 1

[2H14] Criticality control technique development for Fukushima Daiichi fuel debris

(19)policy of critilcality control

*Makoto Nakano^1,2, Yasuhiro Harada^1,2, Yamato Hayashi^1,3, Hiromi Maruyama^1,4 (1.International Research Institute for Nuclear Decommissioning, 2.Mitsubishi Heavy Industries, LTD., 3.Toshiba Corporation Energy Systems & Solutions Company, 4.Hitachi-GE Nuclear Energy,Ltd.)

Keywords:Fukushima NPP SA, molten nuclear fuel, fuel debris, criticality safety, neutron absorber

We summarized the criticality risk considering fuel debris retrieval method at Fukushima NPP. We suggest the reasonable criticality control method using MS(Preventing System) and MS(Mitigation System) system while the nuclear fuel debris retrieval work at Fukushima NOO.