APPARATUS, METHOD, AND PROGRAM FOR MONITORING NUCLEAR THERMAL-HYDRAULIC STABILITY IN NUCLEAR REACTOR

摘要

PROBLEM TO BE SOLVED: To provide a technique for monitoring nuclear thermal-hydraulic stability in a nuclear reactor, with improved monitoring accuracy and improved reliability.SOLUTION: A nuclear thermal-hydraulic stability monitoring apparatus 50 includes: a receiving unit 51 that receives LPRM signals S from a plurality of detectors 31 arranged in a reactor core 16; a cell allocation unit 52 allocating the LPRM signals S from the detectors 31 that adjoin OPRM cells M, where n=1, 2, ... N, set within the reactor core 16 and that are combined such that horizontal positions and height positions do not match, to the OPRM cells M; a selector 54 selecting one of the LPRM signals S allocated to the OPRM cells Mas a reference signal; a phase-difference correction unit 55 correcting a phase difference between the reference signal allocated to the OPRM cell Mand the other LPRM signals S; and a signal addition unit 56 outputting OPRM signals T, where n=1, 2 ... N, obtained by adding the phase-difference-corrected LPRM signals S to the reference signal.