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In-core neutron flux monitoring device and measuring circuit protecting method

A flux measurement and measurement circuit technology, which is applied in reactors, nuclear power generation, nuclear reactor monitoring, etc., can solve problems such as easily damaged secondary instrument measurement circuits, and achieve the effect of improving reliability

Active Publication Date: 2017-06-09
NUCLEAR POWER INSTITUTE OF CHINA
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AI Technical Summary

Problems solved by technology

[0006] The invention provides a core neutron flux measuring device and a measuring circuit protection method, which solves the technical problem that the measuring circuit of the secondary instrument is easily damaged by directly connecting the output terminal of the detector to the measuring circuit of the secondary instrument, and realizes Discharge the accumulated charge of the self-sufficient detector, thereby reducing the voltage at the output of the detector to the safe voltage that the secondary instrument measurement circuit can withstand, protecting the measurement circuit, and preventing the technical effect of high voltage damage to the measurement circuit

Method used

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  • In-core neutron flux monitoring device and measuring circuit protecting method

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Embodiment 1

[0029] In Embodiment 1, a core neutron flux measurement device is provided, please refer to Figure 1-Figure 2 , the device includes:

[0030] Self-sufficient energy detector, secondary instrument measurement circuit, wherein, a discharge device is connected between the self-supplied energy detector and the secondary instrument measurement circuit; the discharge device specifically includes: ESD protection diodes, resistors, capacitors One or more of them; the device also includes: a shielded cable, wherein the shielded cable is connected between the signal lead wire connection of the self-powered detector and the discharge device.

[0031] In the stack test, after the output end of the self-powered detector is placed in the air for a period of time, the measured voltage value of the self-powered detector can be close to 90V. The detector current charges this capacitor to a high voltage. If such a high voltage is not added to the front end of the secondary instrument measure...

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Abstract

The invention discloses an in-core neutron flux monitoring device and a measuring circuit protecting method. The device comprises a self-powered detector and a secondary instrument measuring circuit, wherein a releasing device is connected between the self-powered detector and the secondary instrument measuring circuit, so that technical effects that electric energy generated by the self-powered detector is released, the secondary instrument measuring circuit is protected and the in-core neutron flux monitoring device is not easy to damage are realized.

Description

technical field [0001] The invention relates to the field of nuclear power equipment core neutron flux measurement, in particular to a core neutron flux measurement device and a measurement circuit protection method. Background technique [0002] With the improvement of reactor design requirements, the core neutron flux measurement technology has developed from the original offline intermittent measurement mode of mobile neutron detectors to the online real-time measurement mode of fixed self-powered detectors. The emitter materials of self-powered detectors mainly include rhodium, vanadium, etc., which have the advantages of simple and reliable structure, can work at high temperature, and do not require bias voltage. [0003] However, once the self-powered detector is placed in the neutron field, a signal current will be generated. When the output terminal of the detector is suspended, the self-powered detector and the detector shell (i.e., the signal ground) will quickly g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/00G21C17/108
CPCG21C17/00G21C17/108Y02E30/30
Inventor 王银丽李昆曾少立罗庭芳杨戴博朱宏亮
Owner NUCLEAR POWER INSTITUTE OF CHINA
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