A Reliability Analysis Method for Nuclear Power Core Water Level Monitoring System

Abstract

The present invention relates to a reliability analysis method for a nuclear power core water level monitoring system. The analysis method includes: step 1, dividing the water level monitoring system into multiple functional units according to the current and signal transmission process, and establishing a structural diagram of the water level monitoring system; step 2 , after analyzing the nuclear power core water level monitoring system, combined with the specific application of whether the key functions of the water level monitoring system are affected, the system is divided into four states, and the Markov model of the water level monitoring system is established; Step 3, Substitute into the Markov model Relevant parameters, solve the probability distribution of each unit in the system in each state in step 2; step 4, draw the corresponding GO diagram of the water level monitoring system, and substitute the probability distribution of each state of each functional unit into the GO diagram to solve the system states The probability distribution of and the availability of the system. This method can objectively and truly evaluate the reliability of the water level monitoring system, and prevent a series of serious consequences caused by the possible lack of reliability of the system.

Description

technical field [0001] The present invention relates to the technical field of reliability analysis of a nuclear power reactor core water level monitoring system, in particular to a method for analyzing the reliability of a water level monitoring system based on the Markov model and the GO method. According to the working principle and internal logical relationship of the water level monitoring system, The system is divided into several modules to realize the reliability analysis of the water level monitoring system. Background technique [0002] The nuclear power core water level monitoring system is a special tool for real-time and accurate water level measurement of nuclear reactors. The water level detector adopts the principle that the heat transfer efficiency of water is higher than that of steam to meet the requirements of water level measurement through temperature difference. The nuclear reactor water level monitoring system is used to monitor the reactor. The inter...

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Problems solved by technology

The defects of these methods are also obvious: the RBD block diagram method tends to analyze the impact of the failure of system parts on the whole, and is based on the traditional series-parallel model. Generally, there are only two states of normal and failure in the RBD block diagram. The impact of different failure modes on the system; the fault tree analysis method, which is a bottom-up analysis of the tree-like logic diagram, will cause the fault tree to be too complicated when it is applied to a system with a large number of parts such as a water level monitoring system The Monte Carlo method needs to establish a reasonable probability model, and then obtain the system reliability based on the statistical simulation of random numbers. It has no rules for the failure distribution of parts and cannot clearly indicate the transition of the system state

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