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原子力機構TIARA遮蔽実験を用いたFENDL-3.0ベンチマークテスト

FENDL-3.0 benchmark test with shielding experiments at JAEA/TIARA

今野 力  ; 太田 雅之; 浅原 浩雄; 落合 謙太郎; 佐藤 聡

Konno, Chikara; Ota, Masayuki; Asahara, Hiroo; Ochiai, Kentaro; Sato, Satoshi

IAEAは中性子入射汎用データのエネルギーを20MeVから60MeV以上に拡張し、陽子,重陽子入射の汎用データ及び放射化データを含めた、核融合炉用核データライブラリーFENDL-3.0を2012年に公開した。今回、原子力機構TIARAでの40MeV, 65MeV準単色中性子による鉄、コンクリート遮蔽実験の解析を行い、FENDL-3.0の中性子入射の20MeV以上の汎用データの妥当性を調べた。その結果、FENDL-3.0を用いた計算は鉄遮蔽実験を良く再現するものの、$$^{16}$$Oの弾性散乱外断面積が小さすぎるためコンクリート遮蔽実験を過大評価することがわかった。FENDL-3.0の$$^{16}$$Oデータは修正が必要である。

IAEA released a new version of Evaluated Nuclear Data Library (FENDL), FENDL-3.0 in 2012 in order to extend the neutron energy range of neutron-induced reactions from 20 MeV to more than 60 MeV and to include general purpose and activation data libraries for proton- and deuteron-induced reactions up to more than 60 MeV. We have carried out benchmark tests of the general purpose data library for neutron-induced reactions in FENDL-3.0 by using iron and concrete shielding experiments with the 40 and 65 MeV neutron sources at TIARA in JAEA. As a result, it was found out that the calculations with FENDL-3.0 agreed with the measured ones for the iron experiment well, while they overestimated the measured ones for the concrete experiment more for the thicker assemblies because of the smaller non-elastic scattering cross sections of $$^{16}$$O in FENDL-3.0. The $$^{16}$$O data in FENDL-3.0 should be revised.

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