An Experimental program addressing core material relocation behavior during severe accident using non-transfer type plasma heating

Sato, Ikken ; Nakagiri, Toshio  ; Abe, Yuta  ; Ishimi, Akihiro ; Nagae, Yuji 

There is a large uncertainty in core material relocation behavior with the BWR design condition during severe accident. In order to address this issue, a new high-temperature experimental technology using non-transfer type plasma torch is under development. Authors have conducted preparatory tests with small scale test pieces and realized melting of simulated core materials. It was also confirmed that computed tomography with X ray as non-destructive means provide precise information on material distribution after the transient. Characteristics of materials after the transient was also studied by various measurement means. These results are showing an excellent perspective for applicability of this new technology to the intended experimental program.