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Dependence of Fast Reactor Fuel Burnup Characteristics on Nuclear Data Libraries

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大木 繁夫 ; 神 智之*

Oki, Shigeo; Jin, Tomoyuki*

高速炉の重金属組成に関する燃焼計算及び核データ感度解析を実施した。次の核データライブラリを比較した: JEF-2.2, ENDF/B-VI Release 5, JENDL-3.2, JENDL-3.3。主要重金属核種($$^{235}$$U, $$^{238}$$U, $$^{239}$$Pu, $$^{240}$$Pu, and $$^{241}$$Pu)についての相違は、それらの1サイクル燃焼後の個数密度がライブラリ間で1ないし2%を超えて変化せず、小さいものであった。マイナーアクチナイド核種については、特に$$^{236}$$U, $$^{237}$$Np, $$^{rm 242m}$$Am, $$^{243}$$Am, Cm同位体では、比較的大きな相違が見られた。それら核種の燃焼後の個数密度は、5%から50%にかけての顕著なライブラリ依存性を示した。一般化摂動理論に基づく燃焼感度解析システムにより、それら相違の原因核種・反応、エネルギー領域を定量的に明らかにした。

Burnup calculation and nuclear-data sensitivity analysis were carried out with respect to the heavy metal composition in fast reactors. The following nuclear data libraries were compared: JEF-2.2, ENDF/B-VI Release 5, JENDL-3.2, and JENDL-3.3. Differences for main heavy metal nuclides ($$^{235}$$U, $$^{238}$$U, $$^{239}$$Pu, $$^{240}$$Pu, and $$^{241}$$Pu) were small since the number densities after 1-cycle burnup did not change over 1 or 2% among those libraries. Relatively large differences were found for minor actinide nuclides, especially for $$^{236}$$U, $$^{237}$$Np, $$^{rm 242m}$$Am, $$^{243}$$Am, and curium isotopes. The number densities for these nuclides after burnup showed remarkable library dependence over 5% through 50%. A burnup sensitivity analytical system based on the generalized perturbation theory enabled us to find out quantitatively the causative nuclides and reactions, as well as their energy regions.

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パーセンタイル:17.6

分野:Nuclear Science & Technology

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