# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (4): 86

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

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

Kiet A. T. Hoang 1,2, Van-Chung Cao 3,4, Van-Khanh Hoang 5, Hoai-Nam Tran 1

1. 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, VNUHCMUniversity of Science, HCMC, Vietnam
5 Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Hanoi, Vietnam
• Contact: Hoai-Nam Tran E-mail:tranhoainam4@dtu.edu.vn
• Supported by:

This work was supported by Vietnam National Foundation for Science and Technology Development (NAFOSTED) (No. 103.04-2014.79).

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Kiet A. T. Hoang, Van-Chung Cao, Van-Khanh Hoang, Hoai-Nam Tran. Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores.Nuclear Science and Techniques, 2016, 27(4): 86
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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 have 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 in the APSD of ex-core detector; however, the increase in 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 dominates the ex-core neutron noise. This behaviour was found similar in both cores.