| 摘要: | 用過核子燃料(Nuclear Fuel)，具高放射性與殘存衰變熱，為降低其對生物安全與環境品質的威脅，國際間一般認為「深層地質處置」是較為安全與可靠的處置方式。
近場分析研究以深層地質處置之概念為基礎，參考瑞典、芬蘭相關文獻，考慮熱源、緩衝材料、回填材料、母岩、擾動帶及間隙之材料特性，以有限元素軟體ABAQUS進行耦合熱-水-力學之分析。
個別分析討論處置孔中間隙與擾動帶對處置孔周圍造成的影響。改變擾動帶的大小與水-力學參數，或是改變間隙熱傳相關參數，在熱-水-力耦合下，模擬處置場峰值溫度、最大應力、與再飽和階段完成時間，之後再針對間隙問題，在整個處置場多孔設施中有局部差異的情況下，探討各處置孔間異質性對彼此交互作用的影響。
研究結果顯示，擾動帶對處置場溫度影響不大；而對飽和度分析結果影響，則因擾動帶範圍而異；且會有效降低應力對緩衝材料的影響。間隙對溫度的影響很大，甚至超過設計標準之100 oC，然而再飽和時間與應力方面影響不大。多孔幾何配置分析上，間隙因範圍小對處置孔與處置孔間影響不大。
研析國外文獻，根據文獻內容，從中獲得審查分析之方向，為國內審查機制的建立，提供一些初步的建議。
;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. |
