The Development Of 3-D Transient Sealing Analysis Program System For The New Type Reactor Pressure Vessel

This paper comes from the project of"the 3-D Program Development for Transient Sealing Analysis in Reactor Pressure Vessel". This project is the subproject of the national defense key technology pre-research project on the program development of reactor design in the tenth Five-year Plan. The aim of this research project is to improve the design quality and level of nuclear-powered device in order to ensure the reliability of the sealing system in the advanced pressurized water reactor vessel and to ensure nuclear security.As the basic safe wall of nuclear reactor,the reactor pressure vessel not only bears high temperature and high pressure, but also contains radioactive working substance. The pressure vessel must keep good sealing performance to avoid the leak of working substance in service. Therefore, an increased demand for reliable sealing analysis for reactor pressure vessel is recognized. However, the sealing analysis is relevant with multiple nonlinear factors and multiple coupled-field effects in mechanics, there is no complete sealing analysis system characterized by value-stable, result reliable and approach versatile for reactor pressure vessel so far except this analysis program.Based on the research of this paper, the complete transient sealing analysis program system with self intellectual property rights has been developed which can be applied in any reactor pressure vessel with different shape. The thermo-elastic-plastic theory, transient and steady-state thermal transferring theory, non-linear temperature field theory, thermal contact theory and software engineering are used to build more realistic computational model during development. At the same time, multi-coupled factors are taken into consideration in the system.The major works of this thesis are listed as follow:1) An efficient linear equations solver is developed in order to solve large-scale sealing problem by FEM. It includes block elimination LDLT decomposition and solution program as well as a corresponding bandwidth optimization program, meanwhile, validated it with many instances.2) An adaptive block method and its high efficient memory access approach in block solution of large-scale linear equations are proposed and the corresponding program is developed. The adaptive block method can automatically block according to the size of memory and the scale of FEA model to improve the solving efficiency.