Patent ID: 9287013
Filing Date: 2016-03-15
CPC Classification: G21C,Y02E

Claim Text:
1. A moderator temperature coefficient measurement apparatus, comprising: an input unit having at least one storage device, the input unit receiving plant data including a coolant temperature signal being time series data on a temperature of a coolant of a light water reactor, and a reactivity signal indicating time series data on a reactivity calculated based on a detection value of a neutron flux in the light water reactor; and a data processing unit programmed to decompose the coolant temperature signal into N time-dependent temperature components and the reactivity signal into M time-dependent reactivity components by a singular value decomposition method, wherein the data processing unit is programmed to generate at least one selected combination by selecting a temperature component from the N time-dependent temperature components and a reactivity component from the M time-dependent reactivity components for each of the at least one selected combination, each of the at least one selected combination consisting of the selected temperature component and the selected reactivity component, and wherein the data processing unit is programmed to calculate a moderator temperature coefficient based on auto and cross power spectral density functions obtained by applying a Fourier transformation to the at least one selected combination, wherein the data processing unit is programmed to extract combinations each of which has a strong correlation between the coolant temperature signal and the reactivity signal on a basis of an auto correlation function from N×M combinations of the N time-dependent temperature components and the M time-dependent reactivity components, and wherein the at least one selected combination is selected from the combinations extracted by the data processing unit.