Reactor core neutron flux prediction method based on detector measurement value

Abstract

The invention discloses a reactor core neutron flux prediction method based on a detector measurement value. The method comprises steps of reading and recording measured values of the in-reactor detectors at different positions of the reactor core from the in-reactor detection system at different time points; fitting the in-reactor detector measurement values at the past time point and the currenttime point, extrapolating the in-reactor detector measurement values, simulating and calculating neutron fluxes at different time points by adopting a reactor core fuel management program, carrying out intrinsic orthogonal decomposition, and calculating a reactor core neutron flux prediction value at a future time point. The method is advantaged in that a measured value of an in-reactor detectoris predicted, a reactor core neutron flux online reconstruction method is combined, a core algorithm of an original reactor core neutron flux online monitoring system is prevented from being changed,and fitting extrapolation only containing one independent variable dimension is independently carried out on the measured value of the in-reactor detector at each position, so the prediction precisionis ensured, overall failure of prediction calculation caused by failure of individual or local detectors is reduced, and accurate prediction of the neutron flux of the reactor core is realized.

Description

technical field [0001] The invention relates to the field of prediction means of nuclear reactor core neutron flux in a power plant, in particular to a method for predicting core neutron flux based on detector measurement values. Background technique [0002] Nuclear reactor core power distribution online monitoring system of power plant, also known as nuclear reactor core neutron flux online monitoring system, its function and role should include four aspects, namely tracking, monitoring, prediction and alarm, in order to realize the monitoring of neutron flux in the core. The full utilization of the existing equipment in the flux online monitoring system is of great significance to ensure the operation and safety of the reactor core and improve the economic benefits of the nuclear power plant. [0003] In order to realize the on-line monitoring of the neutron flux in the nuclear reactor core, it is necessary to additionally install in-core neutron detectors and signal proc...

AI Technical Summary

Problems solved by technology

[0006] However, there are few studies on the prediction of nuclear reactor core neutron flux, and there are few reports on the state of the nuclear reactor core alarm; core neutron flux prediction calculation and core neutron flux The biggest difference between online monitoring and calculation of neutron flux in nuclear reactor core is that the prediction calculation of nuclear reactor core neutron flux is a kind of calculation including time dimension, which is a description of time variable. The method is used in predictive calculations. Except for the harmonic synthesis method based on the function expansion idea and the intrinsic orthogonal decomposition method that can introduce time variables, other calculation methods cannot introduce time variables, and the early developed core neutron The core algorithm of the flux online monitoring system has been determined, and changing the algorithm does not meet the original intention of making full use of the existing equipment in the system

Images