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Device and method for calibrating neutron sensitivity of out-of-pile detector

A technology for calibrating devices and detectors, applied in measurement devices, neutron radiation measurement, instruments, etc., can solve the problems of inability to display the exact value of the thermal neutron flux rate outside the reactor, and inability to provide detector sensitivity data, etc. Reliable measurement guarantee, easy operation and accurate measurement results

Pending Publication Date: 2021-12-31
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the lack of sensitivity calibration specifications for these types of detectors, the sensitivity data of the detectors cannot be provided when the detectors are replaced, resulting in the detectors being unable to display the accurate value of the thermal neutron fluence rate outside the heap

Method used

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  • Device and method for calibrating neutron sensitivity of out-of-pile detector

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Embodiment 1

[0050] Such as figure 1 As shown, the present invention is a neutron sensitivity calibration device for an ex-core detector, which includes: a line neutron source 12, a source storage container 13, a shielding body 2, a moderator 3, a detector positioning hole 5 and a calibration tunnel ; when the calibration device is in a non-working state, the line neutron source 12 is located in the source storage container 13; the source storage container 13 is arranged in a deep underground pit, and the concrete around the deep pit can be used for radiation protection; the detection The device positioning hole 5 is set on the top of the calibration hole;

[0051] The line neutron source 12 is used to generate fast neutrons;

[0052] The shielding body 2 is used to shield the neutron source 12 of the line when the calibration device is in working state, so as to reduce the neutron radiation level;

[0053] The moderator 3 is used to moderate the fast neutrons generated by the line neutr...

Embodiment 2

[0070] Such as figure 1 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a neutron sensitivity calibration method for an ex-core detector, and the calibration method is applied to the neutron sensitivity of an ex-core detector described in Embodiment 1. Sensitivity calibration device; the calibration method includes:

[0071] S1: Accurately measure the thermal neutron injection rate value Φ at the calibration position by the gold activation sheet method (unit: cm -2 ·s -1 );

[0072] S2: Place the detector on the detector displacement positioning device, and move it to the calibration position to obtain the reading N of the detector at this time (unit: A or cps);

[0073] S3: Using the neutron sensitivity calculation formula, calculate the neutron sensitivity S of the detector at the value of the thermal neutron fluence rate (unit: cps / cm -2 ·s -1 or A / cm -2 ·s -1 ); where, the formula for calculating neutron sensitivity...

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Abstract

The invention discloses a device and a method for calibrating the neutron sensitivity of an out-of-pile detector. The device comprises a linear neutron source, a source storage container, a shielding body, a moderation body, a detector positioning hole and a calibration hole channel, wherein the linear neutron source is used for generating fast neutrons; the shielding body is used for shielding the linear neutron source when the device is in a working state; the moderation body is used for moderating fast neutrons generated by the linear neutron source into thermal neutrons; the calibration hole channel serves as a space where a thermal neutron field formed by thermal neutrons is located and is used for reflecting the thermal neutrons and improving the thermal neutron fluence rate; the out-of-pile detector is placed in the thermal neutron field of the calibration device through the detector positioning hole, and the detector can move up and down along the detector hole channel according to an instruction sent by verification personnel through the control system. The device is simple and convenient to operate, is the only device for calibrating the neutron sensitivity of the out-of-reactor detector in China at present, and can generate a thermal neutron field meeting requirements for calibrating the neutron sensitivity, thereby providing reliable metering guarantee for safe operation of a reactor.

Description

technical field [0001] The invention relates to the technical field of ionizing radiation measurement, in particular to a neutron sensitivity calibration device and method for an ex-core detector. Background technique [0002] In the design of nuclear reactors, the state of the core is monitored by arranging radiation detectors (or external detectors) for the nuclear measurement system at different positions outside the reactor, which is also commonly used to measure the neutron flux rate of the core online. horizontal approach. It mainly has two functions: running function and safety function. The operation function means that the neutron fluence rate level and fluence rate changes in the nuclear reactor can be given at any time to guide the opening and operation of the nuclear reactor. The safety function refers to the ability to provide emergency shutdown and alarm signals so that nuclear reactor control operators can take effective measures in a timely manner to preven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00G01T7/00
CPCG01T3/00G01T7/005Y02E30/30
Inventor 任敏杨毓枢王旭张劲松钟军陈嘉浪刘吉珍漆明森程瑛江常玉王军成周春林
Owner NUCLEAR POWER INSTITUTE OF CHINA
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