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Safety approach for plasma anomaly events in fusion reactor: Code development and assessments

T. Honda, H.-W. Bartels, N.A. Uckan, Y. Seki, T. Okazaki1998年Fusion Engineering and DesignIF 1.7出版社

AbstractA safety assessment method for plasma transients, including thermal response of in-vessel components, was provided. We developed a plasma physics model for safety analysis which has been implemented in a safety analysis code (SAFALY). The SAFALY code consists of a zero-dimensional plasma dynamics model and a 1.5-dimensional thermal behavior model of in-vessel components in the thickness direction. The code can treat hydraulic accidents using the results from a hydraulic code and analyze a passive plasma shutdown due to the impurity release from the wall. The abnormal events in the International Thermonuclear Experimental Reactor (ITER) calculated here are: (i) loss of plasma control, and (ii) large ex-vessel loss of coolant accident (LOCA) in the first wall and large ex-vessel LOCA in the divertor. The plasma transient and thermal response of in-vessel components in such events have been assessed using the code.

日本語訳

プラズマ過渡現象に対する安全評価手法を、真空容器内機器の熱応答を含めて提示した。我々は安全解析用のプラズマ物理モデルを開発し、これを安全解析コード(SAFALY)に実装した。SAFALYコードは、プラズマ動特性のゼロ次元モデルと、真空容器内機器の厚さ方向の熱挙動を表す1.5次元モデルから構成される。本コードは、熱流動コードの結果を用いて水力的事故を扱うことができ、壁からの不純物放出による受動的プラズマ停止を解析することができる。ここで計算した国際熱核融合実験炉(ITER)における異常事象は、(i)プラズマ制御の喪失、および(ii)第一壁における大規模な冷却材喪失事故(LOCA)とダイバータにおける大規模な冷却材喪失事故である。これらの事象におけるプラズマ過渡現象と真空容器内機器の熱応答を、本コードを用いて評価した。

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