Nuclear main pump system reliability analysis method based on probabilistic service life agency relationship

Abstract

The invention discloses a nuclear main pump system reliability analysis method based on a probabilistic service life agency relationship, and belongs to the field of nuclear reactor coolant pump design and manufacturing. The method comprises the following steps: fitting nuclear main pump part failure test data by using a Kriging agent model to obtain an explicit agent relationship of a part probability service life curve; obtaining a nuclear main pump part load probability distribution function by adopting the operation load data output by the nuclear main pump numerical simulation; processinga pump shell, an impeller, a heat shield, a flywheel, a pump shaft, a guide bearing, a thrust bearing, a shielding sleeve or a shaft seal according to a part linear cumulative damage rule, and establishing a nuclear main pump series system reliability model; and randomly drawing a nuclear main pump part operation load and probability service life curve, circularly calculating accumulated damage of each part, obtaining the service life of the nuclear main pump system, calculating a nuclear main pump system failure probability density distribution function, and finally obtaining the reliabilityof the nuclear main pump system. The method has the advantages that a nuclear main pump reliability ultra-small sample is analyzed in a high-precision manner, and universality is achieved.

Description

Technical field [0001] The invention relates to a nuclear main pump system reliability analysis method based on probabilistic service life agency relationship, and belongs to the field of nuclear reactor coolant pump design and manufacturing. [0002] technical background [0003] At present, researchers have conducted many studies on the reliability evaluation of electromechanical product systems. The main research methods include direct analysis of product service life, condition monitoring and evaluation, and evaluation methods based on stress-strength interference models. In 1989, Astridge reported the "Helicopter transmissions-design for safety and reliability" paper, using the service life direct analysis method to evaluate the life of the helicopter gearbox to obtain the life distribution, and then predict the service reliability of the gearbox through the life distribution. However, the direct analysis method of service life requires a large amount of statistical data on pr...

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Problems solved by technology

[0006] Purpose and task of the present invention: to overcome the existing electromechanical product reliability analysis method which mainly considers the data of the fatigue life curve, fails to fully consider the data of the probabilistic service life curve of complex system multi-failure modes, and requires a large number of test sample data and analysis accuracy and low efficiency, which cannot be used for the reliability assessment of the nuclear main pump system

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