Method for measuring insulation resistance of self-powered neutron detector online

A technology of self-sufficient energy detectors and neutron detectors, applied in the direction of impedance measurement, etc., can solve the problems of inability to test the insulation performance of self-sufficient energy neutron detectors, and achieve the effect of reducing the possibility of personnel being exposed to radiation

Active Publication Date: 2017-07-14
STATE NUCLEAR POWER AUTOMATION SYST ENGCO +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide an online method for measuring the insulation resistance of a self-supplied neutron detector to solve the problem that the insulation performance of the self-supplied neutron detector cannot be tested during the power operation of the reactor

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  • Method for measuring insulation resistance of self-powered neutron detector online
  • Method for measuring insulation resistance of self-powered neutron detector online
  • Method for measuring insulation resistance of self-powered neutron detector online

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, a method for online measurement of the insulation resistance of a self-powered neutron detector, the method specifically includes the following steps:

[0027] Step 1. Build a circuit for online measurement of the insulation resistance of the self-sufficient neutron detector;

[0028] In the self-sufficient neutron detector, a resistance R of MΩ level is connected in series 2 and switch K 1 The parallel structure, in which, when the self-powered detector is exposed to a certain rated neutron fluence rate level, it can be regarded as a constant current source I det , and the insulation resistance of the self-powered detector is R L , the resistance of the signal loop connected to the self-powered detector is R 1 And it is known that the external resistance R 2 Resistance is much greater than R 1...

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Abstract

The invention relates to the technical field of nuclear instrument and meter test, and specifically discloses a method for measuring the insulation resistance of a self-powered neutron detector online. The method comprises the following steps: (1) building a circuit for measuring the insulation resistance of a self-powered neutron detector; (2) getting a current generated on a signal loop of a self-powered neutron detector under the condition that no external resistor is connected; (3) getting a current generated on the signal loop of the self-powered neutron detector under the condition that an external resistor is connected; and (4) calculating the value of insulation resistance of the self-powered neutron detector according to the value of current on the signal loop of the self-powered neutron detector under the condition that no external resistor is connected and the value of current on the signal loop of the self-powered neutron detector under the condition that an external resistor is connected obtained in step (2) and in step (3). Through the method, self-powered neutron detectors can be monitored online during reactor power operation, personnel in the nuclear power plant are helped to monitor the operation state of self-powered neutron detectors, the efficiency of equipment maintenance and management can be improved, and the possibility that personnel is irradiated is reduced.

Description

technical field [0001] The invention belongs to the technical field of testing nuclear instruments and meters, and in particular relates to a method for on-line measuring the insulation resistance of a self-sufficient neutron detector. Background technique [0002] The currently used self-supplied neutron detector insulation testing technology mostly adopts the off-line method, and 50VDC is applied between the signal terminal of the self-supplied neutron detector and the ground to measure the insulation value of the detector. This off-line self-supplied neutron detector insulation method is very effective during the outage of nuclear power plants, but the detector cannot be disconnected during reactor power operation, especially in AP1000 nuclear power plant self-supplied neutron detectors and related The signal processing equipment is located in the reactor containment, and it is difficult for personnel to enter during the power operation of the reactor, so this method cann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/18
CPCG01R27/18
Inventor 李树成吴军汤仲鸣李连防杨清邓鹏周星杰刘文臻胡铸萱杨志军罗鸣文赵哲
Owner STATE NUCLEAR POWER AUTOMATION SYST ENGCO
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