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Decay heat measurement of fusion related materials in an ITER-like neutron field

ITER模擬中性子スペクトル下における核融合炉材料の崩壊熱測定

森本 裕一*; 落合 謙太郎; 前川 藤夫; 和田 政行*; 西谷 健夫; 竹内 浩

Morimoto, Yuichi*; Ochiai, Kentaro; Maekawa, Fujio; Wada, Masayuki*; Nishitani, Takeo; Takeuchi, Hiroshi

崩壊熱を正しく予測することは、ITERの事故時安全性の確保のうえで重要である。特に、銅,ステンレス鋼,タングステンの崩壊熱については精度15%以内で予測する必要がある。本研究では、これらのうち銅とステンレス鋼をITERを模擬した中性子スペクトル下で照射し、その崩壊熱を全エネルギー吸収スペクトロメーターで測定した。測定結果を中性子輸送計算コードMCNPによる予測値と比較した結果、崩壊熱を正しく評価するには、銅及びステンレス鋼ともに共鳴吸収に対する自己遮へい効果を適切に考慮する必要があることがわかった。

Decay heat is one of the most important factors for the safety aspect of ITER. Especially, prediction of decay heat with uncertainty less than 15% for the three most important materials, i.e., copper, type-316 stainless steel (SS-316) and tungsten, is strongly requested by designers of ITER. To provide experimental decay heat data needed for validation of decay heat calculations for SS316 and copper, an experiment was conducted as the ITER/EDA task T-426. An ITER-like neutron field was constructed, and decay heat source distributions in thick copper and SS316 plates were measured with Whole Energy Absorption Spectrometer. The measured decay heat distributions in the thick sample plates were compared with the predicted values by MCNP calculations. It was found that the use of an effective activation cross section calculated by MCNP was needed to consider the self-shielding effects and, for both cases, MCNP calculations could predict decay heat adequately.

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