舱室内γ外照射剂量快速估算方法的比较  

A Comparative Study of Different Methodologies for Fast Estimation of External Gamma Radiation Doses inside Compartments

作　　者：杨章灿 何莹钊 王帅 Yang Zhangcan;He Yingzhao;Wang Shuai(Department of Nuclear Engineering and Technology,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China;China Ship Development and Design Center,Wuhan,430064,China)

机构地区：[1]华中科技大学能源与动力工程学院核工程与核技术系,武汉430074 [2]中国舰船研究设计中心,武汉430064

出　　处：《核动力工程》2021年第1期95-99,共5页Nuclear Power Engineering

摘　　要：舱室内γ外照射剂量的快速估算对于核动力船舶核事故后果评价、核应急决策等具有重要意义,但是目前对于舱室内γ外照射剂量的快速估算尚无明确的标准或统一公式。采用MCNP程序计算结果作为基准,对烟羽浸没公式和点核积分公式这2种快速估算方法进行了评估,详细分析了这2种估算方法在不同形状、不同体积舱室情况下的估算结果误差及原因。结果表明,舱室的形状越偏离半球体形状、体积越大,公式估算结果与MCNP程序计算结果偏差越大:有限烟羽浸没公式的误差约为30%,点核积分公式的误差约为10%。因此,在实际工程应用时,点核积分公式可提供更为准确和快速的估算结果。For nuclear-powered ships, the fast estimation of external gamma radiation dose is important for accident consequence evaluation and emergency response plan. However, currently there is no standard for the fast estimation of external gamma radiation dose in compartments. In this study, the results by MCNP calculations are used as a baseline to evaluate the accuracy of two methodologies, namely the finite cloud immersion method and the point-kernel integral method. Comparisons are performed for compartments with different shapes and volumes. The results show that the errors become larger if the shape of a compartment is more different from a hemisphere, or the volume of a compartment is larger;the error of the finite cloud immersion method is about 30%, while the error of the point-kernel integral method is about 10%. Therefore, the point-kernel integral method can provide more accurate and fast estimation for practical applications.

关 键 词：核动力船舶 γ外照射 烟羽浸没公式 点核积分方法 MCNP 

分 类 号：TL72[核科学技术—辐射防护及环境保护]