Study On Integrated Simulation Methodology And Technology For Nuclear And Radiation Safety

How to predict radiation dose of staff and reduce the radiation harm is one of the key issues of radiation protection. Simulation technology which connects theory and experimental study has been widely used in planing, evaluation and optimization of radiation-related activities. With the development of modern information technologies, such as, network and communication, high-performance computing, virtual simulation and visualization in scientific computing, high fidelity simulation of the operation process in nuclear and radiation environment and efficient development of nuclear technologies have been widely studied.In this thesis, a systematic and deep study on how to achieve high fidelity simulation of the operation process in nuclear facilities repair and reduce occupational irradiation dose as much as possible, has been conducted by applying the advanced information technologies. Main work and innovations are as follows:1) Based on the deep investigation of existing nuclear and radiation safety simulation approaches and system, a component based multi-layer framework for nuclear and radiation safety integrated simulation has been prensented. In this framework, the component technology and hybrid service mode coupling with C/S and B/S approaches were adopted. And requirements on scheme’s interaction design and simulation analysis, scheme and worker’s historical dose remote management, virtual operating and training and so on, are well satisfied in this framework.2) According to the requirement on real-time rendering of large scale complex scenes in stand-alone device, an octree based real-time rendering method has been presented. The method optimizes the data field and model simulation scene visualization process. Meanwhile, according to the needs of superimposed visualization of irregular data field and model, the author develops the large irregular data field visualization method and the model superposition based on programmable GPU. The method avoids data regularization operation and improves the efficiency of real-time rendering of simulation data.3) Giving consideration to easy use, excellent expansibility and high fidelity comprehensive simulation, an integrated system RVIS has been developed and applied to the evaluation and optimization of ITER PF4coil maintenance, the simulation result received ITER organization recognition. And this proposed method and system provide a useful approach to guide the analysis and optimization of ITER maintenance.