Method for on line monitoring fatigue damage of nuclear grade equipment and pipelines

A fatigue damage and equipment technology, which is applied in the field of nuclear power equipment safety research, can solve the problems of conservative cumulative fatigue utilization coefficient, complex fatigue design of nuclear-level equipment and pipelines, and reduce the conservativeness of fatigue calculation, so as to simplify the technical effect and reduce the conservativeness. Effect

Inactive Publication Date: 2017-11-10
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0005] The invention provides a method for on-line monitoring of fatigue damage of nuclear-grade equipment and pipelines, which solves the problem that the cumulative fatigue service coefficient calculated by the method for calculating fatigue damage of nuclear-grade equipment and pipelines in the prior art is relat

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  • Method for on line monitoring fatigue damage of nuclear grade equipment and pipelines
  • Method for on line monitoring fatigue damage of nuclear grade equipment and pipelines
  • Method for on line monitoring fatigue damage of nuclear grade equipment and pipelines

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[0056] Example one:

[0057] In the first embodiment, a method for online monitoring of fatigue damage of nuclear equipment and pipelines is provided. Please refer to Figure 1-Figure 7 , The method includes:

[0058] First, use finite element analysis software to generate Green's function of the analysis position;

[0059] Then, apply finite element analysis software to generate the structure's response to unit pressure and unit mechanical load;

[0060] Then, monitoring and recording the fluid temperature and pressure within a range of less than or equal to the first preset distance from the analysis position by the monitoring device, where the calculation period is the first preset period;

[0061] Then, take the monitored real-time temperature and pressure data of nuclear power plants as input, apply the Green's function method to calculate the thermal stress, and calculate the pressure stress and mechanical external load stress, and the cumulative stress will get the total stress ...

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Abstract

The invention discloses a method for on line monitoring fatigue damage of nuclear grade equipment and pipelines. The key of the method for achieving on-line calculating of a fatigue using coefficient is to calculate the thermal stress field quickly; based on the principle of linear superposition, the Green function method can be used to calculate the thermal stress of structures quickly; on this basis, the fatigue using coefficient can be calculated on line, and the real-time on-line monitoring can be realized; the fatigue using coefficient of the nuclear grade equipment and pipelines can be calculated by using the Green function method; fluid temperature and pressure data needed by calculation are measured in real time by existing or newly added monitoring equipment, and finally fatigue damage assessment results can be output in real time in a display terminal of a main control room; therefore, the technical effects of reducing the conservatism of fatigue calculation and simplifying the fatigue design of the nuclear grade equipment and pipelines are achieved.

Description

technical field [0001] The invention relates to the field of nuclear power equipment safety research, in particular to a method for on-line monitoring of nuclear-level equipment and pipeline fatigue damage. Background technique [0002] During the service of nuclear power plants, the fluctuation of operating temperature and pressure produces alternating stress on nuclear equipment and pipelines. When the alternating stress reaches a certain level, it will cause fatigue damage to nuclear equipment and pipeline systems. In the design stage of nuclear power plants, the operating transients suffered by equipment and pipelines are design transients. The design transients are generated based on idealized calculation models, which are more severe than the actual transients, and the sequence of these design transients ( That is, the transient history) is unknown, so the most unfavorable transient history can only be assumed in the fatigue design analysis of nuclear-level equipment a...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2113/14G06F2119/06G06F2119/08
Inventor 谢海张毅雄艾红雷郑连纲崔怀明卢喜丰曾忠秀
Owner NUCLEAR POWER INSTITUTE OF CHINA
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