Improved availability evaluation method for nuclear power design phase

Abstract

An improved availability evaluation method for a nuclear power design phase comprises S1, screening out a system in which a fault may cause the reactor tripping and the turbine tripping of a unit; S2,performing FMEA analysis on the equipment in the system screened out in the step S1 to determine all single and dual failure modes that cause the reactor tripping and the turbine tripping of the unit; S3, taking an event that the system is unavailable and causes the unit to stop and reduce the power as a top event, and for each failure mode, determining the minimum cut set by fault tree modeling;S4, determining a failure rate and a mandatory unavailable time of each minimum cut set; S5, calculating an annual unplanned shutdown frequency of a nuclear power plant by using the failure rate of each minimum cut set and the annual number of times / annular time of the fault; and calculating the annual mandatory unavailable time of the nuclear power plant based on the failure rate and the mandatory unavailable time of each minimum cut set; and S6, determining the availability of the nuclear power plant based on the annual unplanned shutdown frequency and the annual mandatory unavailable time.The method can quantitatively predict the availability of the nuclear power plant.

Description

technical field [0001] The present invention relates to the technical field of reliability of nuclear power plants, in particular to an improved availability evaluation applied to nuclear power plant availability quantitative prediction and quantitative evaluation, using unplanned outage frequency and unplanned outage time as evaluation indicators for nuclear power design stage method. Background technique [0002] The power production of nuclear power plants is centered on the safety and reliability of the unit, with the goal of economical operation. The more times of unplanned outages and the longer the unplanned outage time, it means that the reliability of nuclear power units is worse, and the goal of economic operation cannot be achieved. Therefore, in the design stage of the power plant, it is necessary to test whether the availability of the power plant can meet the requirements of the owner or industry standards. [0003] The determination of the availability of ex...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, aiming at the defects that the above-mentioned experience reference and feedback method of the prior art cannot be applied to different new nuclear power plants and equipment operation and maintenance experience in the design stage, and is not easy to popularize, a method for nuclear power design stage is provided. The improved usability evaluation method of

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