Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores

A.T. Hoang Kiet; Van-Chung Cao; Hoang Van-Khanh; Tran Hoai-Nam

doi:10.1007/s41365-016-0103-9

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Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2021-02-23

- Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores
- Nuclear Science and Techniques Vol. 27, Issue 4, Article number: 86(2016)
- Affiliations：
  
  1.Institute of Research and Development, Duy Tan University, K7/25 Quang Trung, Da Nang, Vietnam
  2.American Polytechnic College, Trung Son KDC, Binh Chanh, HCMC, Vietnam
  3.Research and Development Center for Radiation Technology, VINATOM, Thu Duc, HCMC, Vietnam
  4.Faculty of Physics and Engineering Physics, VNUHCM-University of Science, HCMC, Vietnam
  5.Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Hanoi, Vietnam
- Author bio：
  
  Corresponding author, tranhoainam4@dtu.edu.vn
- Funds：
- DOI：10.1007/s41365-016-0103-9
  CLC：
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A.T. Hoang Kiet, Van-Chung Cao, Hoang Van-Khanh, et al. Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores. [J]. Nuclear Science and Techniques 27(4):86(2016)
DOI：

A.T. Hoang Kiet, Van-Chung Cao, Hoang Van-Khanh, et al. Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores. [J]. Nuclear Science and Techniques 27(4):86(2016) DOI： 10.1007/s41365-016-0103-9.

摘要

Abstract

Calculation of the neutron noise induced by fuel assembly vibrations in two pressurized water reactor (PWR) cores has been conducted to investigate the effect of cycle burnup on the properties of the ex-core detector noise. An extension of the method and the computational models of a previous work has been applied to two different PWR cores to examine a hypothesis that fuel assembly vibrations cause the corresponding peak in the auto power spectral density (APSD) increase during the cycle. Stochastic vibrations along a random two-dimensional trajectory of individual fuel assemblies were assumed to occur at different locations in the cores. Two models regarding the displacement amplitude of the vibrating assembly have been considered to determine the noise source. Then, the APSD of the ex-core detector noise was evaluated at three burnup steps. The results show that there is no monotonic tendency of the change of the APSD of ex-core detector, however, the increase of APSD occurs predominantly for peripheral assemblies. When assuming simultaneous vibrations of a number of fuel assemblies uniformly distributed over the core, the effect of the peripheral assemblies dominate the ex-core neutron noise. This behaviour was found similar in both cores.

关键词

Keywords

Neutron noiseFuel vibrationex-core noiseAPSDPWR

references

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Related Institution

Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University

Department of Computer & Information Sciences, Pakistan Institute of Engineering & Applied Sciences (PIEAS)

Department of Physics & Applied Mathematics, Pakistan Institute of Engineering & Applied Sciences (PIEAS)

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School of Mechanical Engineering, Shanghai Jiao Tong University

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