Method for signal compensation through prompt gamma signals of self-powered detector

Abstract

The invention relates to a method for signal compensation through prompt gamma signals of a self-powered detector. The method comprises the following steps that 1, neutron fluence rate distribution in a nuclear reactor is measured through the self-powered in-reactor detector; 2, the percent K of the gamma signals in signals collected by the self-powered in-reactor detector is determined; 3, the signals collected by the self-powered in-reactor detector are subjected to compensation, the self-powered in-reactor detector is a vanadium-based self-powered in-reactor detector, and the compensation function is shown in the specification, wherein T1 / 2 is the half-life period of an emitter material of the self-powered in-reactor detector, and S is a Lapras operator. The collected signals are subjected to compensation through the compensation function, and therefore the precision degree of axial power deviation measurement on the compensated signals can be improved.

Description

technical field [0001] The invention belongs to the field of axial power offset measurement, and in particular relates to a method for signal compensation using a self-powered detector instantaneous gamma signal. Background technique [0002] Advanced nuclear power plants often use lower-value control rod groups to deal with changes in xenon transients and fuel consumption, and use higher-value rod groups to control axial power distribution, which can significantly reduce the need for boron adjustment during load-following operation. The frequency of boron adjustment in base load operation greatly reduces the discharge of boron-containing radioactive waste liquid. This frequent movement of control rods has brought significant negative impacts on traditional nuclear power plant methods based on seldom changing control rods and using calibrated signals from out-of-nuclear reactor tests for core protection and axial power deviation control. Although self-powered in-pillar dete...

AI Technical Summary

Problems solved by technology

This frequent movement of the control rods has brought significant negative impacts on traditional nuclear power plants based on the seldom changing of the control rods and using the calibrated signals from the out-of-nuclear reactor test for core protection and axial power deviation control.

Although self-powered in-pillar detectors (such as vanadium-based detectors) are widely used, they can accurately give the distribution of neutron fluence rate in the heap, but the neutron response delay of detectors up to several minutes prevents them from being directly used in axial offset control

These delayed self-energy detectors can respond quickly to the γ fluence, but because these signals are relatively weak compared to the current of the β delayed effect, they are generally regarded as interference signals

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