核与辐射安全集成仿真方法与技术研究

发布时间：2018-02-22 02:16

本文关键词： 核与辐射安全集成仿真实时渲染实时剂量评估国际热核聚变实验堆　出处：《中国科学技术大学》2014年博士论文　论文类型：学位论文

【摘要】：如何准确预知核与辐射环境下从业人员受到的辐射剂量,尽量降低核与辐射危害一直是辐射防护领域关注的重要问题。仿真科学将理论和实验研究连接起来,己被广泛应用于计算机模拟核与辐射环境下应用方案的设计、评估和优化,其分析过程一般表现为跨平台、跨领域、多用户协作之间的迭代优化。随着网络与通信、高性能计算、虚拟现实、可视化等信息技术的快速发展,为从整体行为上高保真集成仿真核与辐射环境下的作业过程、高效开展核设计和分析提供了可能。本文在此背景下结合当前相关先进信息技术与理论,就如何高保真模拟核与辐射环境下作业过程、尽可能降低职业辐照剂量等相关问题展开了系统深入地研究。主要工作以及创新点描述如下： 1)在充分调研国内外研究现状的基础上,系统分析了核与辐射安全集成仿真需求,结合当前先进信息技术,构建了一套支持多种服务模式、基于组件技术的面向核与辐射安全集成仿真的层次化、模块化系统架构,提供了作业方案交互设计、仿真和分析、人员剂量管理、虚拟培训等多种服务需求的集成仿真解决方案； 2)提出并发展了基于自适应八叉树与视锥体裁剪技术的大规模复杂场景实时渲染方法和基于GPU的不规则数据场与任意几何体叠加可视化方法,从简化渲染数据量、避免数据规则化处理等多个环节对耦合辐射数据场的大规模复杂仿真场景交互式渲染过程进行了优化,提高了仿真场景渲染的效率解决了大规模复杂仿真场景难以在单机上实时渲染的问题； 3)在上述研究基础上,完成了核与辐射安全集成仿真系统RVIS2.0系统的设计与开发,为从整体行为上高保真集成仿真核与辐射环境下的作业过程,高效保障“知剂量”优化决策提供了可能。在国际合作框架协议支持下,将RVIS2.0应用于国际热核聚变实验堆ITER极向场线圈PF4维修剂量的仿真与分析中,给出了优化的屏蔽和维修方案,对辅助ITER维修优化具有积极意义。
[Abstract]:How to accurately predict the radiation dose to the workers in the nuclear and radiation environment and minimize the nuclear and radiation hazards has always been an important concern in the field of radiation protection. It has been widely used in the design, evaluation and optimization of application schemes in computer simulation nuclear and radiation environments. The analytical process is generally characterized by iterative optimization between cross-platform, cross-domain, multi-user collaboration. The rapid development of information technology such as high performance computing, virtual reality and visualization makes it possible to integrate the operation process under the environment of nuclear and radiation from the overall behavior of high fidelity integrated simulation, and to carry out nuclear design and analysis efficiently. In this context, combining with the current relevant advanced information technology and theory, this paper discusses how to simulate the operation process in nuclear and radiation environment with high fidelity. Related issues, such as minimizing occupational radiation doses, have been systematically and deeply studied. The main work and innovations are described as follows:. 1) based on the research status at home and abroad, the integrated simulation requirements of nuclear and radiation safety are analyzed systematically, and a set of supporting service modes is constructed combining with the current advanced information technology. Based on component technology, the hierarchical and modular system architecture of integrated simulation for nuclear and radiation safety provides interactive design, simulation and analysis of operation scheme, personnel dose management, etc. Integrated simulation solution for many kinds of service requirements such as virtual training; 2) the real-time rendering method of large-scale complex scene based on adaptive octree and visual cone clipping technology and the method of overlay visualization of irregular data field and arbitrary geometry based on GPU are proposed and developed to simplify the rendering data volume. The interactive rendering process of large-scale complex simulation scene with coupled radiation data field is optimized by avoiding the regularization of data processing and other links. The efficiency of simulation scene rendering is improved, and the problem that large-scale complex simulation scene is difficult to render on single machine is solved. 3) on the basis of the above research, the design and development of the integrated nuclear and radiation safety simulation system (RVIS2.0) is completed. Under the support of international cooperative framework agreement, RVIS2.0 is applied to the simulation and analysis of the maintenance dose of ITER poloidal field coil PF4 in the international thermonuclear fusion test reactor. The optimized shielding and maintenance scheme is given, which is of great significance to the optimization of auxiliary ITER maintenance.
【学位授予单位】：中国科学技术大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TP391.9;TL7

【参考文献】