近场核素释放率对缓冲材料参数的敏感性研究

辐射防护 ›› 2019, Vol. 39 ›› Issue (5): 403-409.

近场核素释放率对缓冲材料参数的敏感性研究

凌辉,王驹,刘月妙,高玉峰,陈伟明,佟强

中核集团核工业北京地质研究院,北京 100029

收稿日期:2018-11-12 出版日期:2019-09-15 发布日期:2019-10-14
作者简介:凌辉(1986—),男,2008年本科毕业于江西师范大学数学与应用数学专业;2012年硕士毕业于南华大学市政工程专业;2018年博士毕业于核工业北京地质研究院地质资源与地质工程专业,工程师。E-mail:lhui1986@126.com

Sensitivity analysis of near-field radionuclide release rate for buffer material parameters

LING Hui, WANG Ju, LIU Yuemiao, GAO Yufeng, CHEN Weiming, TONG Qiang

Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029

Received:2018-11-12 Online:2019-09-15 Published:2019-10-14

摘要/Abstract

摘要： 缓冲材料对高水平放射性废物(高放废物)地质处置库的安全至关重要。本文在处置库关闭后预期演变情景分析的基础上,运用蒙特卡罗随机模拟方法,对缓冲层厚度、缓冲材料密度、核素在缓冲材料中的分配系数这三个参数进行敏感性分析。结果表明,处置库关闭后1 000 a内,近场核素释放率对缓冲层厚度较敏感,超过1 000 a 后敏感性较低;近场核素释放率对缓冲材料密度不敏感;核素在缓冲材料中的分配系数不断提升的情况下,对应的参数敏感度也逐渐加大。上述敏感性分析结果可为缓冲材料工程设计提供参考。

关键词: 高放废物, 地质处置, 缓冲材料, 情景, 敏感性分析

Abstract: The buffer material is critical to long-term safety for geological repository of high level radioactive waste disposal. Based on safety analysis of long-term evolution scenario for repository, this paper focuses on sensitivity analysis of buffer material parameters such as the buffer thickness, the density of buffer material, and the distribution coefficient of radionuclide in buffer material through the Monte Carlo stochastic simulation method. The simulated results indicate that the near field radionuclide release rate is sensitive to the buffer thickness within 1000 years after closure of a disposal repository, and less sensitive thereafter. The near field radionuclide release rate is not sensitive to the density of buffer material. When the distribution coefficient of radionuclide in buffer material increases continuously, the corresponding sensitivity increases gradually. The results show that the sensitivity analysis can provide feedback guidance for the design of buffer material.

Key words: high level radioactive waste, geological disposal, buffer material, scenario, sensitivity analysis

凌辉,王驹,刘月妙,高玉峰,陈伟明,佟强. 近场核素释放率对缓冲材料参数的敏感性研究[J]. 辐射防护, 2019, 39(5): 403-409.

LING Hui, WANG Ju, LIU Yuemiao, GAO Yufeng, CHEN Weiming, TONG Qiang. Sensitivity analysis of near-field radionuclide release rate for buffer material parameters[J]. RADIATION PROTECTION, 2019, 39(5): 403-409.

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