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※ 半角英数字
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軽水炉使用済み燃料の核種インベントリ

Nuclide inventories of spent fuels from light water reactors

奥村 啓介; 岡本 力

Okumura, Keisuke; Okamoto, Tsutomu

軽水炉使用済み燃料の貯蔵,輸送,再処理,処分の安全性検討において、臨界性,崩壊熱,放射能,毒性等を評価するためには、正確な核種別インベントリの情報が重要となる。そこで、最新の核データライブラリ(JENDL-4.0)と高精度な格子燃焼計算コード(MOSRA-SRAC)を使用して、日本の商用軽水炉における燃料仕様と運転条件を網羅する多数の格子燃焼計算を実施し、核特性やバックエンドの観点から重要と考えられる21の重核種と118の核分裂生成核種に対して、燃焼による核種インベントリの変化とその範囲を明らかにした。

Accurate information on nuclide inventories of spent fuels from Light Water Reactors (LWRs) is important for evaluations of criticality, decay heat, radioactivity, toxicity, and so on, in the safety assessments of storage, transportation, reprocessing and waste disposal of the spent fuels. So, a lot of lattice burn-up calculations were carried out for the possible fuel specifications and irradiation conditions in Japanese commercial LWRs by using the latest nuclear data library JENDL-4.0 and a sophisticated lattice burn-up calculation code MOSRA-SRAC. As a result, burn-up changes of nuclide inventories and their possible ranges were clarified for 21 heavy nuclides and 118 fission products, which are important from the viewpoint of impacts to nuclear characteristics and nuclear fuel cycle and environment.

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