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SCALE6.2.1の遮蔽用AMPX多群ライブラリテスト

Test of AMPX multigroup library for shielding in SCALE6.2.1

今野 力; 多田 健一

Konno, Chikara; Tada, Kenichi

SCALE6.2.1は2016年に公開され、世界中で使われている。SCALE6.2.1にはENDF/B-VII.0とENDF/B-VII.1から作られた新しい形式のAMPXライブラリ(多群ライブラリ, 連続エネルギーライブラリ、ORIGENライブラリ等)が付属している。今回、SCALE6.2.1システム付属のENDF/B-VII.1から作られた新しい形式の遮蔽用AMPX多群ライブラリ(scale.rev12.xn200g47v7.1, 中性子200群, $$gamma$$線47群)で以前指摘した分離共鳴領域の自己遮蔽補正の問題が解決しているかどうかを調べるとともに非分離共鳴の自己遮蔽補正も調べた。そのため、中心に20MeVの中性子源のある半径1mの鉄あるいはヒ素の球内の中性子, $$gamma$$線スペクトルをANISNコードで計算した。その結果、scale.rev12.xn200g47v7.1の分離共鳴領域の自己遮蔽補正が十分でないことがわかった。一方、非分離共鳴領域の自己遮蔽補正はNJOYよりもFRENDYに近い結果を示した。

SCALE6.2.1 was released in 2016 and has been used worldwide. It includes new AMPX libraries (multigroup, continuous energy, ORIGEN, etc.) of ENDF/B-VII.0 and ENDF/B-VII.1. Now we investigate whether the self-shielding correction problem for resolved resonances, which was pointed out before, is revised in the AMPX multigroup library (scale.rev12.xn200g47v7.1, neutron 200 groups and $$gamma$$ 47 groups) for shielding. We also examine the self-shielding correction for unresolved resonances. Neutron and $$gamma$$ spectra inside an iron or arsenic sphere of 1 m in radius with a 20 MeV neutron source at the center were calculated with a one-dimensional Sn code ANISN. As a result, it was verified that the self-shielding correction of scale.rev12.xn200g47v7.1 for resolved resonances was not still correct. It was shown the self-shielding correction for unresolved resonances was similar to that with FRENDY, not NJOY.

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