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During the operation of pressurized water reactor(PWR), vibrations of in-core components could cause fluctuations in the neutron macroscopic cross-section, which in turn induce neutron noise. Existing studies mainly focus on the calculation methods of neutron noise and inversion diagnosis of noise sources, while insufficient attention is paid to the correlation between its propagation characteristics and core design. As an advanced third-generation reactor type independently developed in China, analyzing the propagation characteristics of neutron noise in the core of HPR1000 is crucial for accurate in-core anomaly detection. To this end, this paper establishes a high-precision calculation method of neutron noise based on the transient neutron diffusion equation and Fourier transform technology. The propagation characteristics are analyzed by simulating the noise source, solving the transient neutron diffusion equation and performing Fourier transform. The numerical results based on the first cycle and equilibrium cycle core of HPR1000 indicate that the neutron noise induced by noise sources at different positions mainly propagates to adjacent components, and its propagation characteristics are irrelevant to the amplitude and frequency of the noise source's neutron macroscopic cross-section fluctuations, but mainly depend on the position of noise source and core layout.
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Basic Information:
DOI：10.20190/j.cnki.02580918.202603005
China Classification Code:TL351.1;TL421.1
Citation Information:
[1]GUO Lin,ZHU Yuxiang,HE Mingtao ,et al.Research on Calculation Method and Propagation Characteristics of Core Neutron Noise in PWR[J].Nuclear Science and Engineering,2026,46(03):559-567.DOI:10.20190/j.cnki.02580918.202603005.
Fund Information:
国家自然科学基金资助项目（No.U24B2010）
2026-06-15
2026-06-15