Comprehensive analysis method for steam explosion of nuclear reactors

Abstract

The invention relates to a comprehensive analysis method for steam explosion of nuclear reactors. The method mainly comprises the following steps of: 1, obtaining initial parameters of the steam explosion; 2, calculating the change of melt in the steam explosion process; 3, calculating the energy exchange on a phase interface; 4, calculating the mass transfer on the phase interface; 5, calculatingthe momentum exchange on the phase interface; 6, semi-implicitly solving energy and momentum equations; 7, full-implicitly solving a mass conservation equation and outputting distribution of pressurewaves; 8, carrying out geometric modeling on main components by using a finite element program ABAQUS; 9, creating material physical properties and analyzing and inputting by taking the pressure wavedistribution in the step 7 as a load; 10, carrying out grid dividing on the main components established in the step 8; and 11, submitting analysis and outputting the stress change of the main components. The comprehensive analysis method disclosed by the invention has the advantages that the distribution situation of the pressure waves and the impact effect of the pressure waves on the main components under steam explosion accidents of the nuclear reactors can be comprehensively analyzed, so that bases are provided for more comprehensively and effectively evaluating the safety of the reactors.

Description

Technical field [0001] The invention relates to the field of nuclear reactor serious accidents, and in particular to a comprehensive analysis method of nuclear reactor steam explosion. Background technique [0002] The Fukushima nuclear power accident in Japan has triggered new attention and research on serious reactor accidents. Steam explosions have become a hotspot and difficulty in serious accident research due to the coupling of phenomena at different time scales and spatial scales under high temperature and pressure. Steam explosion in the reactor will have a great impact on the early failure of the lower head of the pressure vessel and whether the lower head can be effectively cooled. A steam explosion outside the reactor may cause the containment to fail, and radioactive materials may leak out. Therefore, studying the phenomenon of steam explosion, understanding of the contact reaction of molten fuel and coolant, and assessing the integrity of safety barriers and the lea...

AI Technical Summary

Problems solved by technology

A large number of theoretical studies have also been carried out on steam explosion, and many sets of steam explosion models and programs have been developed. Most of the steam explosion programs can analyze the rough mixing process and steam explosion process, but there is no analysis of the reactor pressure vessel and reactor internal structure after the steam explosion occurs. analyze the impact

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