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Reactor nuclear power monitoring method and system

A monitoring system and reactor technology, which is applied in the field of reactor nuclear power monitoring based on neutron noise signals, can solve the difficulty of calculating the effective intensity of neutron sources, the uncertainty of neutron source reactivity value, and the unreliable measurement results, etc. problem, to achieve the effect of convenient and fast measurement, complicated solution process, and large error solution

Inactive Publication Date: 2017-10-03
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Other methods such as the source introduction method, due to the difficulty in calculating the effective intensity of the neutron source, and the uncertainty of the reactivity value of the neutron source, therefore, the measurement results are not very reliable

Method used

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  • Reactor nuclear power monitoring method and system
  • Reactor nuclear power monitoring method and system
  • Reactor nuclear power monitoring method and system

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Effect test

Embodiment 1

[0034] A reactor nuclear power monitoring method, comprising the following steps:

[0035] A. After the reactor power level stabilized, two symmetrically arranged neutron gamma compensated ionization chambers were used to measure the reactor neutral

[0036] sub-noise signal;

[0037] B. Calculate the FFT of the time signal for two sets of neutron noise signals, and calculate the cross power spectral density φ XY And normalized processing;

[0038] C. Fit the cross-power spectral density and calculate a specific frequency ω 1 The cross power spectral density φ′ when XY (ω 1 );

[0039] D. According to the parameters obtained by fitting, the fission rate F of the reactor is obtained, thereby obtaining the absolute power P of the reactor.

[0040] The measurement method is based on the statistical fluctuation of the average current or voltage caused by a large number of neutrons, and then determines the absolute and absolute value of the reactor dynamic parameters accordin...

Embodiment 2

[0064] Such as figure 1 Shown, a kind of reactor nuclear power monitoring system based on above-mentioned method comprises:

[0065] Two sets of neutron gamma-compensated ionization chambers for symmetrically distributed collection of character noise signals in the reactor;

[0066] A micro-current amplifier used to amplify the output current signal of the neutron γ-compensated ionization chamber and convert it into a voltage signal;

[0067] A signal conditioning circuit that processes the output signal of the microcurrent amplifier and converts the output DC level signal and neutron noise signal into a digital signal;

[0068] A data analysis and processing unit that analyzes and processes the nuclear power of the reactor according to the output signal of the signal conditioning circuit and realizes the control of the micro-current amplifier and the signal conditioning circuit.

[0069] Two sets of neutron gamma compensation ionization chambers constitute the primary instr...

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Abstract

The invention discloses a reactor nuclear power monitoring method and system. The method comprises A, after the reactor power level is stable, measuring neutron noise signals through two symmetrically arranged neutron gamma compensation ionization chambers, B, calculating time signal FFT through the two neutron noise signals, calculating cross-spectral density phi XY and carrying out normalization, C, fitting the cross-spectral density and calculating cross-spectral density phi XY (omega 1) at frequency omega 1, and D, according to the fitted parameters, acquiring a reactor fission rate F and reactor absolute power P. The method and system can realize parameter measurement without interference on normal operation of the reactor, is suitable for all reactors and realizes fast and convenient measurement.

Description

technical field [0001] The invention relates to the field of reactor nuclear power monitoring, in particular to a method and system for calibrating reactor nuclear power monitoring based on neutron noise signals. Background technique [0002] During the zero-power physical test of the reactor, in order to ensure that the operating power does not exceed the requirements of relevant nuclear safety regulations and operating limits and conditions, and to provide input parameters for checking theoretical calculations, the absolute power of the reactor needs to be known. [0003] In thermal neutron zero power reactors, the calibration absolute power usually adopts the activation analysis method, which has many correction factors and complicated data processing. If the absolute power is high, it must be calibrated frequently, which seems quite troublesome. There is also a method of calculating absolute power based on the temperature difference between the inlet and outlet of the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/104
CPCG21C17/104Y02E30/30
Inventor 刘才学彭翠云曾杰何攀
Owner NUCLEAR POWER INSTITUTE OF CHINA
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