基于不同大气稳定度分类方法的核电厂事故剂量评价

摘要/Abstract

摘要： 利用PAVAN程序对四种不同的大气稳定度分类方法下的短期大气弥散因子进行计算,并计算选址假想事故下非居住区边界(500 m)和规划限制区边界(5 km)处的剂量。采用理查逊数法进行稳定度分类时的短期大气弥散因子值最小,采用ΔT/U法进行稳定度分类时的短期大气弥散因子值最大。比较四种稳定度分类方法得到的选址假想事故导致的在非居住区边界上公众(事故后2 h)可能受到的最大有效剂量以及整个事故持续期间内规划限制区边界(5 km)个人受照的最大有效剂量,四种分类方法计算得到的剂量结果均满足GB 6249—2011的要求,采用理查逊数法进行稳定度分类时的剂量值均最小,采用ΔT/U法进行稳定度分类时的剂量值均最大,最大值约是最小值的1.6倍。在核电厂环境影响分析时应重点关注不同的大气稳定度分类方法对选址假想事故剂量评价的影响。

关键词: 大气稳定度, 短期大气弥散因子, 选址假想事故, 剂量

Abstract: The short-term atmospheric dispersion factors under four different classification methods of atmospheric stability were calculated by using PAVAN program, and the dose at the boundary of exclusion area (500 m) and planning restricted area (5 km) under the postulated siting accident was calculated. The result shows that the value of the short-term atmospheric dispersion factor under the Richardson number method is the smallest, while the value under the ΔT/U method is the largest. The value of the maximum individual effective dose on the exclusion area boundary (2 hour after the accident) and value at the planning restricted area boundary during the postulated siting accident satisfied the requirement of GB 6249, and the value of the dose was also the smallest under the Richardson number method, the largest under the ΔT/U method. The maximum value is about 1.6 times the minimum value. For the environmental impact assessment, it should be paid more attention to the influence of different atmospheric stability classification method on the dose evaluation of postulated siting accident.

Key words: atmospheric stability, short-term atmospheric dispersion factor, postulated siting accident, dose

中图分类号:

王一川, 李帷, 王悦斌, 李洋, 巩建业. 基于不同大气稳定度分类方法的核电厂事故剂量评价[J]. 辐射防护, 2024, 44(6): 595-600.

WANG Yichuan, LI Wei, WANG Yuebin, LI Yang, GONG Jianye. Dose assessment for nuclear power plant accident based on different stability classification method[J]. RADIATION PROTECTION, 2024, 44(6): 595-600.

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