我国和瑞典高放废物地质处置库中缓冲材料性质分析

ANALYSIS ON CHARACTERISTICS OF BUFFER MATERIALS IN GEOLOGICAL DISPOSAL REPOSITORIES FOR HIGH-LEVEL WASTES IN CHINA AND SWEDEN

缓冲材料是高放废物地质处置工程屏障系统的重要组成部分。基于瑞典缓冲材料MX-80膨润土的物理性质,对设计要求的主要参数如渗透系数、膨胀力、材料成分开展分析,并以缓冲材料饱和密度作为长期安全性评价指标分析主要影响因素(外间隙宽度、砌块和小球的干密度),为我国高放废物地质处置库缓冲材料的设计提供参考。

Buffer materials are important parts of barrier systems in geological disposal of high-level radioactive wastes.Based on the physical properties of MX-80 bentonite,a Swedish buffer material,the design parameters such as permeability coefficients,swelling forces and material composition were analyzed.The saturated densities of buffer materials were taken as the long-term safety evaluation indexes to analyze the main influencing factors(outer clearance widths,densities of blocks and pellets),which could provide reference to design of buffer materials in geological disposal for high-level wastes in China.