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Spent Nuclear Fuel Waste has highly radioactive and residual decay heat. In order to avoid the influence that Spent Nuclear Fuel may cause to the environment, and consider safety function, technology and economy, the method of deep geologic disposal is regarded as the most safety and effectively way.
In this study, near field analysis is based on the concept of deep geological disposal. Considering the properties of heater, buffer, backfill, rock, EDZ (evaluation damage zone) and gap in the reference from Sweden and Finland. Using finite element method software-ABAQUS to build the model with those properties and conditions for coupled thermo-hydro-mechanical analysis.
To discuss the effect cause by EDZ and gap done to disposal hole, changing the size and the hydro-mechanical properties of EDZ, or the thermal properties of gap, and then modeling the peak temperature, maximum stress and time-scale of hydration of disposal hole. In the case of multi-disposal holes with local differences between each disposal hole, this research consider different thermal properties of gap, then discuss the influence of heterogeneity in disposal holes.
According to the research, EDZ won’t make big effect to peak temperature. The difference between results of saturation analysis is because of the size of EDZ cases. EDZ will effectively reduce the impact of stress on buffer. Gap has great influence on the result of temperature analysis, even make it higher than 100 oC; However, gap cause little effect to stress and time-scale of hydration. About the analysis result of multi-disposal holes, gap cause little effect to the difference between disposal holes, because of the size is small.
This research studies the foreign papers, and obtains the orientation of the review and analysis according to the content of the papers, and provides some preliminary suggestions for establishment of the domestic review method. | en_US |