Experimental validation of unique combination numbers for third- and fourth-order neutron correlation factors of zero-power reactor noise

Experimental validation of unique combination numbers for third- and fourth-order neutron correlation factors of zero-power reactor noise
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零功率反应堆噪声三阶和四阶中子相关因子唯一组合数的实验验证

DOI:
10.1080/00223131.2019.1580625
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发表时间:
2019
影响因子:
1.2
通讯作者:
Cheol Ho Pyeon
Cheol Ho Pyeon
中科院分区:
工程技术4区
文献类型:
--
作者:
Tomohiro Endo;Akio Yamamoto;Masao Yamanaka;Cheol Ho Pyeon

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零功率反应堆噪声对于次临界测量是有用的。本文从核反应堆物理和中子探测理论出发,从理论上阐明了三阶和四阶中子关联因子可以表示为二阶中子关联因子的函数。特别是,如果中子计数门的宽度足够大,对于源驱动的次临界系统,饱和值和几乎等于唯一的组合数‘3’和‘15’,其中次临界小于10,000×10,000×10,000×10,000×10,000。这些独特的组合数字‘3’和‘15’在京都大学临界性大会上进行了实际零功率反应堆噪声测量,并得到了验证。在这项研究中,估计了统计误差和不同门宽之间的相关性由于聚束方法,实现了移动块自举方法。对于一个足够长的稳态和无扰动状态下测量的反应堆噪声,可以通过统计量化测量值与唯一组合数之间的差值来进行评估临界状态和次临界绝对测量的统计检验。
Zero-power reactor noise is useful for subcriticality measurements. Based on the nuclear reactor physics and the theory of neutron detection, this paper theoretically clarifies that the third- and fourth-order neutron correlation factorsandcan be expressed as functions of the second-order neutron correlation factor. In particular, if the neutron-counting gate width is sufficiently large, the saturation valuesandare almost equal to the unique combination numbers, ‘3’ and ‘15,’ for a source-driven subcritical system, where the subcriticality is less than 10,000 pcm. These unique combination numbers, ‘3’ and ‘15,’ forandwere validated using actual zero-power reactor noise measurements carried out at the Kyoto University Criticality Assembly. In this study, the estimation of statistical errors and correlations between different gate widths owing to the bunching method was achieved by the moving block bootstrap method. For a sufficiently long measured reactor noise in a steady and unperturbed state, a statistical test for the evaluation of the critical state and the absolute measurement of subcriticality can be carried out by statistically quantifying the difference between the measurement value ofand the unique combination number.
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