摘要
在聚变评价数据库FENDL/2的基础上,采用三维蒙特卡罗输运程序MCNP/4C,对核聚变装置HT-7U运行时的环境辐射剂量率进行了模拟计算及相关分析,着重研究了HT-7U硼水屏蔽层不同设计方案对环境剂量率的影响。计算结果表明,硼水层有效地减小了装置运行时周围环境的辐射剂量率,而浓缩硼水方案相对天然硼水方案,屏蔽效果提高不明显。同时本文也对聚变装置环境辐射剂量计算中的天空反(散)射效应进行了初步的研究,计算结果显示,当屏蔽大厅顶厚减至0.5m以下时,装置运行时大厅外辐射剂量分布呈现明显的阴影效应。
The environmental dose rate distribution of the fusion device HT-7U during operation was calculated and analyzed by using the three-dimensional Monte Carlo transport code MCNP/4C and the latest Fusion Evaluated Nuclear Data Library FENDL/2. The influence of filling materials of the double-wall vacuum vessel on the environmental dose rate was investigated. The results demonstrate that the borated water filled in the vacuum vessel significantly reduces the environmental dose level. However the shielding effect of the enriched borated water is not evident as compared with the natural borated water. In addition, the radiation skyshine was investigated and it was found that the shadow effect was clearly shown in the environmental dose rate distribution for the thickness of the concrete ceiling less than 0.5 m.
出处
《核技术》
CAS
CSCD
北大核心
2005年第1期83-88,共6页
Nuclear Techniques
