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A Fatigue Life Estimation Method for Nuclear Power Plant Piping

A fatigue life, nuclear power plant technology, applied in the field of nuclear power, can solve the problems of inability to more accurately grasp the failure of nuclear power plant pipeline failures, and inability to better grasp the thermal fatigue data of the power plant, so as to achieve the effect of preventing accidents

Active Publication Date: 2016-09-14
中广核工程有限公司 +1
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Problems solved by technology

[0011] However, currently available commercial fatigue analysis software does not take into account the effects of different reactor coolant environments, and designers cannot gain a better grasp of plant thermal fatigue when there are two or more types of stress cycles that produce effective stress fluctuations data and cannot more accurately capture trends in nuclear plant piping failures due to thermal fatigue

Method used

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  • A Fatigue Life Estimation Method for Nuclear Power Plant Piping
  • A Fatigue Life Estimation Method for Nuclear Power Plant Piping
  • A Fatigue Life Estimation Method for Nuclear Power Plant Piping

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Embodiment Construction

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] Such as figure 1 In the flow chart of the fatigue life estimation method for nuclear power plant piping shown, the following steps are included:

[0038] S1: Use a temperature sensor to measure the temperature of the outer wall of the nuclear power plant pipeline; specifically, the temperature sensor is a thermocouple; two thermocouples are respectively arranged above and below the outer wall of the nuclear power plant pipeline to measure the temperature of the nuclear power plant pipeline The temperature of the outer wall of the pipe of the nuclear power plant; at least three thermocouples are arranged at equal intervals on the same side of the outer wall of the pipe of the nuclear power plant to measure the tem...

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Abstract

The invention discloses a method for estimating the fatigue life of a pipeline of a nuclear power plant. The method comprises the following steps: S1, measuring the temperature of the outer wall of the pipeline; S2, calculating information on a temperature field of the inner wall of the pipeline; S3, counting the cycle index of an effective load, determining alternating stress, and amending an S-N curve; S4, calculating a fatigue coefficient and amending the fatigue coefficient; and S5, estimating the fatigue life. The method has the beneficial effects of helping a designer master relevant data of the nuclear power plant under a thermal fatigue environment, optimizing an operating standard and an inspection outline according to the estimated fatigue life, developing the design safety margin of the pipeline of the nuclear power plant and providing data support for the regular audit or lifetime extension of the power plant.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a method for estimating the fatigue life of pipelines in nuclear power plants. Background technique [0002] In nuclear power plants, the fatigue life of piping is one of the important indicators for evaluating its quality. In order to ensure the inherent reliability of piping, how to avoid fatigue failure is a common concern of engineers and technicians when designing fatigue life. [0003] Fatigue failure refers to the failure mode in which the damage of the local high-stress part of the material gradually accumulates under the action of cyclic load, and after a certain number of cycles, a crack is formed or the crack continues to expand under the action of cyclic load, resulting in a complete fracture. It is the failure mode of the nuclear power plant pipeline. One of the main forms, it can even cause unplanned shutdown of power plants in severe cases. [0004] The anal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 凌君何大宇王骄亚刘洪涛闫蔚彭华清秦戈
Owner 中广核工程有限公司
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