DDET and RELAP5 coupled dynamic characteristic analysis method based on auxiliary variable method

Abstract

The invention discloses a DDET and RELAP5 coupled dynamic characteristic analysis method based on an auxiliary variable method. The method comprises the following steps: constructing a DET simulation model of a discrete dynamic event tree, and modifying a TRIP card of an RELAP5 program input file according to a DET simulation object state transition type in a manner of adding auxiliary TRIP variables; the simulation time of the RELAP5 program is set, the step length of the simulation time of the RELAP5 program is controlled, and an output result file of each simulation step length of the RELAP5 program is analyzed; According to the DET simulation object state transition type, backtracking and executing the RELAP5 program. The method has the advantages that the setting process and method of the DET state transition object TRIP in the RELAP5 program input file needed by DET and RELAP5 program coupling are simplified, the modeling complexity is reduced, and the analysis efficiency is improved.

Description

technical field [0001] The invention relates to the field of nuclear power plant safety analysis, in particular to a dynamic characteristic analysis method coupled with DDET and RELAP5 based on an auxiliary variable method. Background technique [0002] Traditional nuclear power plant safety analysis methods include deterministic safety analysis methods and probabilistic safety assessment methods; among them, deterministic safety analysis methods generally use RELAP5 and other software; probabilistic safety assessment methods are based on traditional event tree / fault tree methods. The traditional single deterministic and probabilistic methods have limitations in analyzing the dynamic characteristics of nuclear power plant accidents. For example, the results of the case analysis of nuclear power plants carried out by the French Electricity Group show that the traditional analysis methods are not effective in estimating the radioactive release caused by severe accidents in nucl...

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Problems solved by technology

[0005] In order to solve the above problems and overcome the shortcomings of the single deterministic safety analysis and probabilistic safety evaluation of traditional nuclear power plants, the present invention provides a system dynamic characteristic analysis method based on auxiliary variable method DDET and RELAP5 program coupling, the analysis method can be Realize the independent coupling of the Dynamic Event Tree (DET) method with the deterministic safety analysis program RELAP5 / MOD4.0, obtain the dynamic characteristics of the nuclear power plant accident conditions more scientifically, and then analyze the nuclear power plant accident conditions The impact of random failures of systems, equipment or personnel on safety characteristics, reducing the conservatism in traditional analysis methods, can provide decision support for the design, operation and management of nuclear power plants, thereby improving the safety and economy of nuclear power plants; and the analysis The method is also applicable to the safety analysis of other complex systems utilizing the RELAP5 program

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