Measurement of Thermal Neutron Flux in Unsteady State for ADS Venus Ⅱ

JIN Jin; ZHU Qingfu; WANG Zhiguang; ZHOU Qi; LUO Peng; KE Guotu

doi:10.11804/NuclPhysRev.35.02.210

Neutron flux measurements were carried out at VENUS-Ⅱ lead-based zero power reactor by neutron activation method combined with solid-state nuclear track detectors (SSNTD). This experimental method was proposed based on the principle of nuclear number conservation when a foil was irradiated in an unsteady-state neutron field. By this method, thermal neutron flux distributions inside the He-3 duct were measured when VENUS-Ⅱ was operated under unsteady-state. The neutron flux distributions were also calculated with MCNPX code and were consistent with the experimental data. In addition, the neutron fluxes in the outer layer of VENUSⅡ were measured under steady-state. These results would benefit the further study of experimental methods for neutron flux measurement and provide important support for the design of CiADS.

Measurement of Thermal Neutron Flux in Unsteady State for ADS Venus Ⅱ

1. China Institute of Atomic Energy, Beijing 102413, China;

2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 7300000, China

Funds: Strategic Priority Research Program of Chinese Academy of Sciences (XDA03010202); National Natural Science Foundation of China (91426301)

Received Date: 2017-08-06

Rev Recd Date: 2018-02-28

Publish Date: 2018-06-20

Key words:

Abstract: Neutron flux measurements were carried out at VENUS-Ⅱ lead-based zero power reactor by neutron activation method combined with solid-state nuclear track detectors (SSNTD). This experimental method was proposed based on the principle of nuclear number conservation when a foil was irradiated in an unsteady-state neutron field. By this method, thermal neutron flux distributions inside the He-3 duct were measured when VENUS-Ⅱ was operated under unsteady-state. The neutron flux distributions were also calculated with MCNPX code and were consistent with the experimental data. In addition, the neutron fluxes in the outer layer of VENUSⅡ were measured under steady-state. These results would benefit the further study of experimental methods for neutron flux measurement and provide important support for the design of CiADS.

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Reference (6)

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[4]	PELOWITZ D B. MCNPX User's Manual, Version 2.7.0. Los Alamos National Laboratory; 2011. LA-CP-11-00438.
[5]	ZHU Qingfu. The Detailed Design Physics Report of Critical Device[R]. Beijing:China Institute of Atomic Energy, 2014. (in Chinese) (朱庆福. 铀棒栅临界实验装置物理详细设计报告[R]. 北京:中国原子能科学研究院, 2014.)
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[1]	NIFENECKER H, MEPLAN O, DAVID S. Accelerator Driven Subcritical Reactors[M]. Grenoble (France):Laboratoire de Physique Subatomique et de Cosmologie, 2003:2.
[2]	ZENG Gang. The Accelerator Driven Evolution Research Project Proposal[R]. Beijing:Chinese Academy of Sciences, 2015. (in Chinese) (曾钢. 加速器驱动嬗变研究装置项目建议书[R]. 北京:中国科学院, 2015.)
[3]	SHI Yongqian. Neutronics Experimental Nuclear Reactor Technology[M]. Beijing:Atomic Energy of China Publishing House, 2011:65. (in Chinese) (史永谦. 核反应堆中子学实验技术[M]. 北京:中国原子能出版社, 2011:65.)
[4]	PELOWITZ D B. MCNPX User's Manual, Version 2.7.0. Los Alamos National Laboratory; 2011. LA-CP-11-00438.
[5]	ZHU Qingfu. The Detailed Design Physics Report of Critical Device[R]. Beijing:China Institute of Atomic Energy, 2014. (in Chinese) (朱庆福. 铀棒栅临界实验装置物理详细设计报告[R]. 北京:中国原子能科学研究院, 2014.)
[6]	VAN WIJK A J, VAN DEN EYNDE G, HOOGENBOOM J E. Annals of Nuclear Energy, 2011, 38:2496.

Measurement of Thermal Neutron Flux in Unsteady State for ADS Venus Ⅱ

doi: 10.11804/NuclPhysRev.35.02.210

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