Measurement of reaction rate of actinide in soft neutron field by D_2O moderator for fast transmutation

D_2O慢化剂快速嬗变测量锕系元素在软中子场中的反应速率

• 批准号: 07680520
• 负责人: IWASAKI Tomohiko
• 金额: $ 1.47万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680520/
• 关键词: transmutation; heavy water; Neptunium; neutron flux; critical assembly; 中性子; アクチニド

Nuclear characteristics of a reactor with a large D_2O reflector was studied experimentally using the Kyoto University Critical Assembly (KUCA). The following experimental data were measured with high accuracy : reaction rate distributions of Np237 in the D_2O reflector. multiplication factors for cores with various D_2O reflectors, neutron flux distributions in a core and the reflector. It should be noted that Np237 samples prepared and employed in this experiment are very valuable because of the sample mass more than I mg. In the analytical study using these experimental data, the followings can be concluded : the MVP code using JENDL3.2 library overestimates multiplication factor of a core with D_2O moderator. the C/E values of both MVP and the SRAC-CITATION codes are about 1.2 for reaction rate of Np237 in a D_2O reflector.

利用京都大学临界装置（KUCA）对带有大型D_2O反射器的反应堆的核特性进行了实验研究。高精度地测量了Np 237在D_2O反射器中的反应速率分布。计算了不同D_2O反射层堆芯的增殖系数、堆芯和反射层中的中子注量率分布。应该注意的是，由于样品质量超过1 mg，因此在本实验中制备和使用的Np 237样品非常有价值。在对实验数据的分析研究中发现：采用JENDL3.2库的MVP程序高估了D_2O慢化剂堆芯的增殖因子。MVP和SRAC-CITATION程序对Np 237在D_2O反射器中反应速率的C/E值均为1.2左右。