Measurement and calculations of angular neutron flux spectra from iron slabs bombarded with 14. 8 MeV neutrons
Measurement and calculations of angular neutron flux spectra from iron slabs bombarded with 14. 8 MeV neutrons
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DOI：
10.13182/nse93-a35519
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发表时间：
1993-09
影响因子：
1.2
通讯作者：
Y. Oyama;K. Kosako;H. Maekawa
中科院分区：
文献类型：
--
作者：
Y. Oyama;K. Kosako;H. Maekawa
在下一步实验性氘-氚（D-T）燃烧聚变反应堆（例如国际热核聚变实验反应堆（ITER））中，铁是用于保护超导磁体免受辐射加热的屏蔽部件中的关键材料。本文用飞行时间技术测量了600 mm以下不同厚度铁板的中子角通量谱。计算结果与MCNP蒙特卡罗程序和DOT 3.5二维离散纵坐标程序的计算结果进行了比较。在DOT 3.5计算中，还应用了具有自屏蔽校正因子的横截面集来检查其效果。结果表明，基于两个文件的MCNP计算对深穿透中子能谱的主要部分吻合得很好，但没有自屏蔽修正的DOT 3.5程序低估了高能通量和随板厚增加的共振能区通量。自屏蔽修正因子改善了低估，但计算的通量仍然小于MCNP计算。
In a next step experimental deuterium-tritium (D-T) burning fusion reactor such as the International Thermonuclear Experimental Reactor (ITER), iron is a key material in the shielding component for protecting the superconducting magnet from radiation heating. In this paper, angular neutron flux spectra leaking from iron slabs with various thicknesses up to 600 mm have been measured by the time-of-flight technique. The results are compared with calculations by the MCNP Monte Carlo code and the DOT3.5 two-dimensional discrete ordinates code with the JENDL-3 nuclear data file and wit ENDF/B-IV. In the DOT3.5 calculations, a cross-section set with a self-shielding correction factor is also applied to examine its effect. The results show that the MCNP calculations based on both files agree very well for the main part of the deeply penetrating neutron spectrum, but the DOT3.5 code without a self-shielding correction underestimates the high-energy flux and the flux in the resonance energy range with increasing slab thickness. The self-shielding correction factor improves the underestimation, but the calculated flux is still smaller than the MCNP calculation.