DET and RELAP5 coupled dynamic characteristic analysis method based on universal auxiliary variable method

Abstract

The invention discloses a DET and RELAP5 coupled dynamic characteristic analysis method based on a universal auxiliary variable method, which comprises the following steps of: constructing a DET simulation model of a discrete dynamic event tree, and modifying an input file TRIP card in a manner of increasing universal auxiliary TRIP variables according to a DET simulation object state transition type; the universal auxiliary TRIP variable is a variable type or a logic type; the simulation time step length is controlled by setting the simulation time of the RELAP5 program, 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 modeling 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 based on a general-purpose auxiliary variable method coupled with DET and RELAP5. Background technique [0002] Traditional nuclear power plant safety analysis methods include deterministic safety analysis method and probabilistic safety assessment method; among them, deterministic safety analysis method generally adopts RELAP5 software; probabilistic safety assessment method is based on traditional event tree / fault tree method. A single deterministic or probabilistic method has limitations in analyzing the dynamic characteristics of nuclear power plant accidents. For example, the results of the nuclear power plant case analysis conducted by the French Electricity Group show that traditional analysis methods are not effective in estimating the frequency of radioactive releases caused by severe accidents in nuclear power pl...

AI Technical Summary

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 dynamic characteristic analysis method based on the general-purpose auxiliary variable method coupled with DET and RELAP5, which is more versatile and applicable The scope is wider, only need to distinguish whether the state transition of DET simulation object belongs to parametric state transition or logical state transition; there is no need to distinguish operation type or demand type, one-time transfer or multiple transfers, and transfer conditions for simulation objects logical judgment relationship

Images