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

非移行型プラズマ加熱を用いたシビアアクシデント時の炉心物質移行挙動解明試験の計画

佐藤 一憲 ; 中桐 俊男  ; 阿部 雄太 ; 石見 明洋 ; 永江 勇二 

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

BWR体系でのシビアアクシデント時の炉心物質移動挙動には大きな不確かさがある。この課題に対応するために、非透過型プラズマトーチを用いた新たな高温実験技術を開発中である。われわれは小規模試験体を用いた予備試験を実施し、試験対象物の溶融を実現した。試験体に対するX線トモグラフィーにより非破壊検査手法として過渡後の詳細な物質分布の状況を把握できることが示された。また過渡後の試験体に対し多様な測定手法を用いて対象物質の特性を調べた。これらの結果から目標とする試験への本技術の適用性について良好な見通しを得た。

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.

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