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Activation analysis for sequential reactions of a fusion Demo-reactor

シーケンシャル反応に対する核融合Demo炉の放射化解析

山内 通則; 西谷 健夫; 西尾 敏; 堀 順一*; 川崎 弘光*

Yamauchi, Michinori; Nishitani, Takeo; Nishio, Satoshi; Hori, Junichi*; Kawasaki, Hiromitsu*

Demo炉では種々の低放射化材料が用いられるが、中性子と材料の核反応で大量に生成される荷電粒子と材料の2次的な反応(シーケンシャル反応)によって生じる放射化が問題となる可能性がある。そこで本研究では、Demo炉の候補材に対し、原子力機構で核融合炉用に開発したACT4コードを用いてこの放射化問題を検討した。材料としては、ブランケット構造材としてF82Hとバナジウム合金,遮蔽材として水素化バナジウム,液体増殖材としてFLiBe,リチウム鉛及び液体リチウムに着目し、Demo炉の想定照射条件で放射化量を計算した。その結果、中,長期の冷却でシーケンシャル反応による放射能からの$$gamma$$線量率が問題になる場合が多々あり、取り出し後の機器の処分,保守作業,液体増殖材ループの遮蔽設計等で考慮が必要なことがわかった。

Low activation material is one of the important factors for constructing high power fusion reactors in future. Unexpected activation, however, may be produced through sequential reactions due to charged particles created by primary neutron reactions. In the present work, the effect of the sequential activation reaction was studied for candidate low activation materials of a fusion demo-reactor. The calculations were conducted by the ACT4 code developed in JAEA for the activation analysis of fusion reactor designs and revised for dealing with the sequential activation reactions. The results say that the real dose rate around vanadium alloy which may be used as structural material becomes larger after the cooling for 3 years by considering the reaction. Although metal hydrate is regarded as an excellent low activation shield material, the reactions due to recoil protons are influential and the dose rate around vanadium hydrate is several orders of magnitude larger than the value calculated without the sequential process after 2 weeks cooling. In case of liquid breeders, the effect of sequential reactions is popularly observed and it affects the shield design of circulation loop.

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分野:Nuclear Science & Technology

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