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)
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.
Calculation of the ex-core neutron noise induced by individual fuel assembly vibrations in two PWR cores
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.
Neutron noiseFuel vibrationex-core noiseAPSDPWR
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