Method and system for calculating and evaluating leakage rate of safety shell of nuclear power plant

Abstract

The invention discloses a method for calculating and evaluating the leakage rate of safety shell of a nuclear power plant, comprising the following steps of: obtaining uncertainty of a class A assessment for calculating the leakage rate of safety shell; obtaining uncertainty of a class B assessment for calculating the leakage rate of safety shell according to the real time measured data of the sensors in the safety shell; and synthesizing the uncertainty of the class A assessment and the uncertainty of the class B assessment into a uncertainty of the leakage rate of safety shell to evaluate calculation of the leakage rate of safety shell according to the uncertainty of the leakage rate of safety shell. The invention also discloses a system for calculating and evaluating leakage rate of safety shell of nuclear power plant. According to the method and system for calculating and evaluating the leakage rate of safety shell of a nuclear power plant, the reliability and accuracy of the evaluation can be improved.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a method and system for calculating and evaluating the containment leakage rate of a nuclear power plant. Background technique [0002] The mass conservation method is commonly used in the world to calculate the containment leakage rate. According to the ideal gas state equation, the standard volume of air (the volume at 0, ℃ 1.01325×105Pa) is equivalent to the air mass, and several standard volume changes DV in one day are used. H Linear fitting with time, the slope of the line is the leakage rate Q of the day ld . Containment leak rate Q ld Characterized by its best estimated value and uncertainty, the uncertainty of containment leak rate is an important index to measure the reliability of leak rate calculation results. [0003] In statistics, the uncertainty of containment leakage rate is composed of Type A assessment uncertainty and Type B assessment uncertain...

AI Technical Summary

Problems solved by technology

[0004] The existing technology generally adopts a known leak rate monitoring software to evaluate the calculation of the leak rate. The software defines the calculation method of the type A assessment uncertainty, but it is not the same as the calculation method of the slope uncertainty specified in statistics. Inconsistency, cannot judge its rationality, resulting in low reliability of this evaluation method

For Type B evaluation standard uncertainty, the software directly gives a fixed value, resulting in low accuracy of this evaluation method

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