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Preparation for a new experimental program addressing core-material-relocation behavior during severe accident with BWR design conditions; Conduction of preparatory tests applying non-transfer-type plasma heating technology

プラズマトーチを用いた炉心物質移行挙動(CMR)模擬試験技術開発

阿部 雄太; 佐藤 一憲; 石見 明洋; 中桐 俊男; 永江 勇二

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

原子力機構では非移行型プラズマ加熱を用いたBWR体系での炉心物質の下部プレナムへの移行挙動(CMR)に着目した試験を検討している。この技術の適用性を確認するため、我々は小規模試験体(107mm$$times$$107mm$$times$$222mmh)を用いたプラズマ加熱の予備実験を行った。これらの予備実験の結果から、SA(シビアアクシデント)研究への非移行型プラズマ加熱の優れた適用可能性が確認できた。また我々は、2016年に中規模の予備実験(燃料ピン50ロッド規模)を準備し、まだ技術的な適用性が確認できていない制御ブレードやCMR自体に関する試験を実施予定である。

A new experimental program using non-transfer type plasma heating is under consideration in JAEA to clarify the uncertainty on core-material relocation (CMR) behavior of BWR. In order to confirm the applicability of this new technology, authors performed preparatory plasma heating tests using small-scale test pieces (107 mm $$times$$ 107 mm $$times$$ 222 mmh). Based on these preliminary results, an excellent perspective in terms of applicability of the non-transfer plasma heating technology to the SA (Severe Accident) experimental study was obtained. Furthermore, JAEA is preparing for the next step intermediate-scale preparatory tests in 2016 using ca. 50 rods and a control blade that would not only confirm its technical applicability, but also some insights relevant to the issue on CMR itself.

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