On-line subcriticality measurement using a pulsed spallation neutron source

被引:20
作者
Iwamoto, Hiroki [1 ]
Nishihara, Kenji [1 ]
Yagi, Takahiro [2 ]
Pyeon, Cheol-Ho [3 ]
机构
[1] Japan Atom Energy Agcy, Tokai, Ibaraki, Japan
[2] Nucl Safety Technol Ctr, Bunkyo Ku, Tokyo, Japan
[3] Kyoto Univ, Inst Res Reactor, Kumatori, Osaka, Japan
关键词
Pulsed neutron source method; area-ratio method; alpha-fitting method; pulsed spallation neutron source; subcriticality; on-line subcriticality monitoring; maximum-likelihood estimation method; Poisson distribution; accelerator-driven system; KUCA; ACCELERATOR-DRIVEN-SYSTEM; REACTIVITY DETERMINATION; UNCERTAINTY ANALYSIS; MINOR-ACTINIDE; DESIGN; JENDL-4.0; SENSITIVITY; PROTONS; IMPACT;
D O I
10.1080/00223131.2016.1274687
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
To investigate the applicability of the pulsed neutron source method using a pulsed spallation neutron source for an on-line subcriticality monitoring system of an accelerator-driven system, a subcritical experiment is conducted using the Kyoto University Critical Assembly in combination with the fixed-field alternating gradient accelerator. Reactivity values obtained from different traditional techniques, the area-ratio method and the -fitting method, are discussed with respect to the applicability to on-line subcriticality monitoring. The results show that the area-ratio method robustly and accurately monitors subcriticality in shallow subcritical states with negative reactivity of up to a few dollars; however, this method faces problems with temporal fluctuations, spatial dispersion, and sensitivity to the proton-beam current with increasing depth of subcriticality. On the other hand, it is shown that the -fitting method alleviates such problems in deep subcritical states. Moreover, a proposed fitting technique using the maximum-likelihood estimation method based on the Poisson distribution is robust enough to be applicable to on-line subcriticality monitoring for negative reactivity levels of up to roughly nine dollars.
引用
收藏
页码:432 / 443
页数:12
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