Measurements of effective delayed neutron fraction in a fast neutron reactor using the perturbation method

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Hao-Jun Zhou, Yan-Peng Yin, Xiao-Qiang Fan, Zheng-Hong Li and Yi-Kang Pu. Measurements of effective delayed neutron fraction in a fast neutron reactor using the perturbation method[J]. Chinese Physics C, 2016, 40(6): 068201. doi: 10.1088/1674-1137/40/6/068201
Hao-Jun Zhou, Yan-Peng Yin, Xiao-Qiang Fan, Zheng-Hong Li and Yi-Kang Pu. Measurements of effective delayed neutron fraction in a fast neutron reactor using the perturbation method[J]. Chinese Physics C, 2016, 40(6): 068201.  doi: 10.1088/1674-1137/40/6/068201 shu
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Received: 2015-06-29
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    Supported by Foundation of Key Laboratory of Neutron Physics, China Academy of Engineering Physics (2012AA01, 2014AA01), National Natural Science Foundation (11375158, 91326104)

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Measurements of effective delayed neutron fraction in a fast neutron reactor using the perturbation method

    Corresponding author: Hao-Jun Zhou,
  • 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
  • 3.  Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
  • 4.  Department of Engineering Physics, Tsinghua University, Beijing 100084, China
Fund Project:  Supported by Foundation of Key Laboratory of Neutron Physics, China Academy of Engineering Physics (2012AA01, 2014AA01), National Natural Science Foundation (11375158, 91326104)

Abstract: A perturbation method is proposed to obtain the effective delayed neutron fraction βeff of a cylindrical highly enriched uranium reactor. Based on reactivity measurements with and without a sample at a specified position using the positive period technique, the reactor reactivity perturbation Δρ of the sample in βeff units is measured. Simulations of the perturbation experiments are performed using the MCNP program. The PERT card is used to provide the difference dk of effective neutron multiplication factors with and without the sample inside the reactor. Based on the relationship between the effective multiplication factor and the reactivity, the equation βeff=dkρ is derived. In this paper, the reactivity perturbations of 13 metal samples at the designable position of the reactor are measured and calculated. The average βeff value of the reactor is given as 0.00645, and the standard uncertainty is 3.0%. Additionally, the perturbation experiments for βeff can be used to evaluate the reliabilities of the delayed neutron parameters. This work shows that the delayed neutron data of 235U and 238U from G.R. Keepin's publication are more reliable than those from ENDF-B6.0, ENDF-B7.0, JENDL3.3 and CENDL2.2.

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