Detecting method and system for integrity of nuclear power station fuel element cladding

A fuel element and nuclear power plant technology, applied in the field of nuclear power plant instrumentation and control, can solve the problems of increasing the coolant or environmental gamma dose rate, unable to quantitatively monitor the damage rate of the fuel element cladding, affecting the reliability of the measurement method, etc., to achieve high feasibility and reliability. Sensitivity, the effect of avoiding false measurements

Inactive Publication Date: 2017-03-22
中广核工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The γ dose rate of the coolant or the environment will also increase due to damage to non-fuel components, which will affect the reliability of the measurement method;
[0007] 2) Existing methods can only qualitatively monitor the damage rate, but cannot quantitatively monitor the damage rate of fuel element cladding

Method used

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  • Detecting method and system for integrity of nuclear power station fuel element cladding
  • Detecting method and system for integrity of nuclear power station fuel element cladding

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Embodiment 1

[0051] figure 1 The flow chart of the detection method for the cladding integrity of nuclear power plant fuel elements in the present invention is shown, which specifically includes the following steps:

[0052]S1. Connect the fuel element cladding of the nuclear power plant to the primary cooling system; if the fuel element cladding is damaged, the radioactive fission and decay products contained in the fuel element will enter the coolant of the primary cooling system;

[0053] S2. Detect the primary loop coolant in the primary loop cooling system through detectors to determine the activity concentration of the radioactive fission gas in the primary loop coolant; the inert gas is produced in the nuclear fission process of the nuclear fuel inside the reactor, and the fission In the process, nuclear energy, fission products and decay products are released, wherein the fission products and decay products contain inert gas, therefore, the radioactive fission gas in the above step...

Embodiment 2

[0068] figure 1 A schematic diagram of the system structure of the detection method for the integrity of the nuclear power plant fuel element cladding in the present invention is shown, which specifically includes:

[0069] The detection assembly 6 is connected to the primary circuit cooling system 2 connected to the nuclear power plant fuel element cladding 1, and is used to detect and output the activity concentration of the radioactive fission gas contained in the primary circuit coolant of the primary circuit cooling system 2;

[0070] A comparison component 7, which is connected to the detection component 6, is used to receive the detected activity concentration output, and compare the detected activity concentration with the preset alarm threshold condition, if it meets alarm threshold condition, an alarm signal is generated and sent;

[0071] And an alarm component 8, which is connected to the comparison component 7, is used to receive the sent alarm signal, and give a...

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Abstract

The invention discloses a detecting method and system for integrity of a nuclear power station fuel element cladding. The detecting system comprises a detecting assembly, a comparing assembly and an alarm assembly, wherein the detecting assembly is used for detecting and outputting activity concentration of inert gas contained in loop coolant; the comparing assembly is used for receiving the output activity concentration obtained through detection, comparing the detected activity concentration with a preset alarm threshold value condition and generating and sending an alarm signal if the alarm threshold value condition is met; the alarm assembly is used for receiving the sent alarm signal and giving an alarm according to the preset alarm mode. The breakage rate of the fuel element cladding can be detected by monitoring the activity concentration of the inert gas contained in the loop coolant, the detecting system is higher in feasibility and sensitivity, and mistake measurement possibly caused by non-fuel element failure can be avoided; one or more alarm threshold values can be set, and the breakage rate limit value of the fuel element cladding concerned during safe operation of a nuclear power plant can be monitored quantitatively.

Description

technical field [0001] The invention relates to the field of instrumentation and control of nuclear power plants, in particular to a method and system for detecting the integrity of nuclear power plant fuel element cladding. Background technique [0002] Nuclear power plants have three protective barriers, of which the first barrier is the fuel element cladding. Therefore, online monitoring of the integrity of fuel element cladding in nuclear power plants in operation is required to ensure the safe operation of nuclear power plants. [0003] When the fuel element is not damaged, the radioactivity in the primary coolant mainly comes from activation products and corrosion products, and the gamma dose rate level produced by it is relatively low; if the fuel element cladding is damaged, the fission products contained in the fuel element ( Mainly inert gas) will also enter the primary coolant, at this time the gamma dose rate of the primary coolant will increase. [0004] In the...

Claims

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Application Information

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IPC IPC(8): G21C17/04
CPCG21C17/044Y02E30/30
Inventor 王骄亚孙瑜凌君周欣建刘洪涛李磊
Owner 中广核工程有限公司
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