小型长寿命核能系统燃料物理性能的研究

本文在简要说明世界上小型长寿命核能系统研究现状的基础上,提出了使用钍-铀燃料和铅-铋冷却剂构造小型长寿命堆芯的设想,并为此进行了一系列燃料物理性能的研究.对于长寿命核能系统的堆芯物理设计,使反应性随燃耗变动最小非常重要,同时应该尽可能地提高堆芯的燃耗以满足长寿命运行的需求.本文使用MCNP和MCBurn程序详细计算分析了使用不同的初始驱动燃料、不同栅格、燃料成分和类型、富集度条件下,燃料栅元的燃耗反应性变化等性能,并对其进行了能谱、转换比、富集度变化等方面的分析,经过对比初步确定了使用钍-铀燃料构造长寿命堆芯的物理条件,并以此为起点构造出一个堆芯,计算给出了反应性空泡系数等安全参数.

Research on Fuel Physical Characteristics in Small Long-Life Nuclear Power System

Based on the simple introduction of recent development status of the long-life small nuclear power systems in the world, this paper puts forward a new concept of building a long-life reactor core with Thorium-Uranium fuel and Lead-Bismuth coolant and conducts a series of research on the characteristics of the Th-U fuel. In the physics design of a long-life reactor, it is important to keep a small reactivity swing with burnup and a deep burnup core. The Program MCNP and MCBurn are used in the calculation of a Pin cell model with different initial driver fuels, p/d ratios, enrichments and fuel types to obtain some results for example neutron spectrum, the reactivity swing with burnup and initial conversion ratio, etc. On the analysis of these results, this paper concludes some physical requirements of a long-life reactor core and constructs a core design with some safety parameters such as void reactivity coefficient and other results.