研究堆退役中的快速辐射传输计算方法研究

Study on Fast Radiation Transport Calculation Methodology in Decommissioning of Research Reactor

研究堆退役过程中需要强大的模拟工具来分析辐射场分布,本文针对其辐射场计算过程中结构复杂及大尺度厚屏蔽的特点,探讨了采用确定论方法和随机性方法进行计算的优缺点。在分析辐射场耦合计算趋势的基础上,选取蒙特卡罗与点核耦合的计算方案,对退役过程中放射性废物储存容器所在的大尺度厚屏蔽房间的辐射场分布进行了计算。结果表明,耦合计算在保证计算精度的前提下,相对于蒙特卡罗计算可节约大量时间。

A powerful simulation tool is required during the decommissioning of research reactor to give the radiation field. Based on the features of complex geometry and largescale bulk shield, the advantage and disadvantage of deterministic and stochastic methods were discussed in this paper. By analyzing the tendency of the coupled simulation, the coupled Monte Carlo-point kernel transport calculation method was adopted. The radiation field in a large-scale room with bulk shield where the radioactive waste is stored during the decommissioning was calculated. The result shows that under the premise of ensuring the precise, the coupled calculation greatly reduces the computation al time comparing with the Monte Carlo calculation.