235U enrichment detection system for nuclear fuel rod based on compact D-D neutron generator
235U enrichment detection system for nuclear fuel rod based on compact D-D neutron generator
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基于紧凑型D-D中子发生器的235U核燃料棒浓缩检测系统
DOI：
10.1007/s11431-021-1893-5
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Zheng Wei
中科院分区：
文献类型：
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作者：
K. Wu;Xingyu Liu;Xu Yang;Changqi Liu;D. Huo;Xiaohou Bai;C. Han;Qi Jiang;Hang Zhang;Jinqiu Peng;Yu Zhang;Junrun Wang;Z. Yao;Zheng Wei
研制了一种基于紧凑型D-D中子发生器的可靠的235 U富集均匀性检测系统，用于检测同一核燃料棒中不同燃料元件的235 U富集均匀性。高产量紧凑型D-D中子发生器提供2.45 MeV D-D中子，通过慢化剂减速为热中子或超热中子，从而诱导235 U裂变产生高激发态裂变碎片，这些碎片通过γ射线发射进行去激发。该系统通过测量γ射线，建立γ射线计数率与核燃料中235 U富集度之间的关系，检测核燃料棒中235 U富集度的均匀性。在235 U相对富集度偏差为10%、中子产额为5 × 108 n/s的条件下，系统的置信概率为99.99%，探测精度随中子产额的增加而提高。该系统能够满足核燃料生产过程的质量控制要求，促进核电安全发展。
A reliable235U enrichment uniformity detection system based on a compact D-D neutron generator is developed to detect the235U enrichment uniformity of different fuel elements in the same nuclear fuel rod. The high-yield compact D-D neutron generator provides 2.45 MeV D-D neutrons, decelerated by a moderator to thermal neutrons or epithermal neutrons, thereby inducing235U fission to produce highly excited state fission fragments that undergo de-excitation via γ-ray emission. The system detects the235U enrichment uniformity of a nuclear fuel rod by measuring γ-rays and establishing a relationship between the γ-ray count rate and235U enrichment in nuclear fuel. The proposed system yields a confidence probability of 99.99% for a relative235U enrichment deviation of 10% and a neutron yield of 5 × 108n/s, and the detection accuracy increases with increasing neutron yield. Furthermore, the developed system can satisfy quality control requirements for nuclear fuel production to promote the safe development of nuclear power.