Investigating the propagation noise in PWRs via closed-loop neutron-kinetic/thermal-hydraulic noise calculations

Based on the discretized governing equations and the proposed solving procedure, the closed-loop noise calculations have been performed (using NOISIM) for the case study of a typical VVER-1000 reactor core and the numerical results are presented and analyzed for different scenarios. The noise sources include the inlet coolant temperature and velocity fluctuations, in addition to the power density noises. Moreover, the space- and frequency-dependence of the propagation noise are studied in this paper.