Nuclear power plant fuel element cladding failure monitoring method and system

A technology for fuel elements and nuclear power plants, which is used in nuclear power generation, nuclear reactor monitoring, nuclear engineering, etc., and can solve the problems of inability to continuously monitor online and to accurately diagnose the damaged shape of fuel element cladding.

Active Publication Date: 2015-09-23
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

[0008] The present invention aims at the technical problems existing in the prior art, which cannot be continuously monitored online, or cannot accurately diagnose defects such as the damaged shape of the fuel element cladding, and provides a nuclear power plant fuel element cladding damage monitoring method and ...

Method used

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  • Nuclear power plant fuel element cladding failure monitoring method and system
  • Nuclear power plant fuel element cladding failure monitoring method and system
  • Nuclear power plant fuel element cladding failure monitoring method and system

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Embodiment 1

[0064] During the operation of a nuclear power plant (such as a pressurized water reactor nuclear power plant), when the fuel element cladding of the nuclear power plant is damaged, the characteristic nuclides produced by nuclear fuel fission, such as iodine (I), xenon (Xe) and other nuclides, in the primary circuit coolant Release, migration and deposition, and according to the size and location of the crack in the shell, and because of the different physical and chemical properties of each nuclide, the amount of the characteristic nuclide released from the crack is also different.

[0065] Please refer to figure 1 The embodiment of the present application provides a nuclear power plant fuel element cladding damage monitoring method, which is used for monitoring and diagnosing the number of damaged fuel element claddings, the damaged size and the burnup area of ​​the damaged component when the nuclear power plant fuel element cladding is damaged. The monitoring method compris...

Embodiment 2

[0099] Based on the same inventive concept, please refer to figure 2, the embodiment of the present invention also provides a nuclear power plant fuel element cladding damage monitoring system, which is used for monitoring and diagnosing the number of damaged fuel element claddings, the size of the damage and the burnup area of ​​the damaged component when the nuclear power plant fuel element cladding is damaged , when the nuclear power plant fuel element cladding is damaged, the characteristic nuclides produced by nuclear fuel fission are released, migrated and deposited in the primary coolant, and the monitoring system includes:

[0100] The data acquisition module 10 is used for online monitoring and acquisition of core operating status data and radioactivity concentration data of characteristic nuclides in the primary coolant;

[0101] The actual diagnostic data calculation module 20 is used to perform N cycles of iterative calculations to obtain the cladding based on the...

Embodiment 3

[0122] Please refer to Figure 4 According to the fuel cladding damage diagnosis model described in Embodiment 1 and the properties of radionuclides in the primary circuit coolant of the nuclear power plant, the embodiment of the present invention also proposes another nuclear power plant fuel element cladding damage monitoring system, including: A data acquisition module 41 for detecting radionuclides in the chemical and volume control system (RCV) pipeline in the primary circuit coolant, and a data processing module 42 connected with the data acquisition module 41 . The data acquisition module 41 is composed of a detection component unit 411 (such as a GEM P-type coaxial HPGe detector), a gamma spectrometer 412, a probe cooler 413 and a 4π lead shield (not shown in the figure). Specifically, the detection component unit 411 includes a detection pipeline and a gamma spectrum probe (not shown in the figure), considering reducing the interference of the surrounding environment ...

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Abstract

The invention discloses a monitoring method and a monitoring system of nuclear power plant fuel element cladding failures. With prior arts, online continuous monitoring is not possible, or defects such as fuel element cladding failure shapes cannot be diagnosed accurately. With the method and the system, the technical problems are solved. The monitoring method comprises the following steps: S1, online monitoring is carried out, such that reactor core operation status data and radioactivity concentration data of a characteristic nuclide in a primary coolant are obtained; S2, N times of loop iteration calculations are carried out based on the reactor core operation status data, the radioactivity concentration data and cladding failure empirical data, such that an Nth set of actual diagnosis data of cladding failure is obtained; S3, when the convergence coefficient of the Nth set of actual diagnosis data and an (N-1)th set of actual diagnosis data obtained by the (N-1)th loop iteration calculation is smaller than or equal to a preset value, the (N-1)th set of actual diagnosis data is determined as a final monitoring diagnosis result. Therefore, online continuous monitoring and diagnosis of fuel element cladding failure existence, failure traits and fuel consumption area location are realized.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant fuel element cladding integrity monitoring, in particular to a nuclear power plant fuel element cladding damage monitoring method and system. Background technique [0002] Fuel element cladding is responsible for containing the fission products of fuel pellets. If the fuel element cladding is damaged, the fission products will be released into the primary coolant through the breach, which will have a potential impact on the safe operation of the nuclear power plant. It is of great contribution to the safe and economical operation of nuclear power plants to timely and accurately determine whether the fuel element cladding is damaged, the size of the breakage and the location of the breakage during operation. [0003] Existing methods for monitoring fuel element cladding damage in nuclear power plants mainly include: total gamma (ray) on-line monitoring method, nuclear sampling system p...

Claims

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Application Information

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IPC IPC(8): G21C17/04
CPCG21C17/04Y02E30/30
Inventor 单陈瑜贾运仓吕炜枫熊军唐邵华潘跃龙杨林君
Owner 中广核工程有限公司
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