METHOD AND APPARATUS FOR MEASUREMENT AND COMPUTING OF PHYSICAL QUANTITY OF BOILING WATER NUCLEAR REACTOR

摘要

PROBLEM TO BE SOLVED: To accurately obtain and evaluate the capacity of inlet of a reactor core and temperature of the cooling material by repeating the converting computing of a heat balance method and a pump part pressure difference measuring method. SOLUTION: In a method for measuring and computing the physical quantity of boiling water reactor, a capacity of inlet of reactor core MCF is expressed as a function of the cooling material densityρby a pump part pressure difference measuring method on the basis of the measurement value (detection value) of the number of revolution n1 of an internal pump and a pump part pressure differenceΔP, and on the other hand, enthalpy h1n of the inlet of the reactor core is expressed as a function of the capacity MCF by the heat balance method on the basis of the measurement value of the water supply capacity MFW and water supply enthalpy hFW, and the heat balance method and the pump part pressure difference measuring method complement the unknown quantity (mass flow of reactor core and cooling material density) with each other. Converging computing of the heat balance method and the pump part pressure difference measuring method is repeated so as to obtain the convergence integral of the unknown quantity, and the capacity of inlet of reactor core MCF and temperature of the cooling material are finally obtained from the convergence integral for evaluation.