MODERATOR TEMPERATURE COEFFICIENT MEASURING DEVICE

摘要

A moderator temperature coefficient measuring device comprises an acquiring section for acquiring plant data including a coolant temperature signal which represents time-series data on the temperature of the coolant of a light-water reactor and a neutron flux signal which represents time-series detected values of neutron flux generated from the light-water reactor, a singular value decomposing section for decomposing the coolant temperature signal into N components T'₁(t) to T'_N(t) by the singular value decomposition method and decomposing the neutron flux signal into M components ?'₁(t) to ?'_M(t) by the singular value decomposition method, a combining section for making a selected component combination of T'_i(t) selected from the N components T'₁(t) to T'_N(t) and ?'_j(t) selected from the M components ?'₁(t) to ?'_M(t), and temperature coefficient calculating section for calculating the moderator temperature coefficient by using auto- and cross-power spectrum density function obtained by Fourier transform of the selected component combination. With such a structure, the moderator temperature coefficient can be detected with high sensitivity without varying the plant state.