用過核燃料深地層處置場近場之熱－水－力學耦合效應分析

ANALYSIS OF THE NEAR-FIELD T-H-M COUPLING EFFECTS IN DEEP GEOLOGIC REPOSITORIES FOR SPENT NUCLEAR FUEL

張瑞宏(Jui-Hung Chang) ； 黃偉慶(Wei-Hsing Huang) ； 黃敬哲(Jing-Jeh Huang) ； 洪祥銘(Shang-Ming Hung) ； 萬明憲(Ming-Hsien Wan)

《中國土木水利工程學刊》 29卷2期 (2017/06) Pp. 63-73

https://doi.org/10.6652/JoCICHE.201706_29(2).0001

摘要

本研究根據我國用過核燃料最終處置的初步設計概念，分析多重障壁系統近場設施之熱－水力－力學（T-H-M）耦合效應，觀察用過核燃料衰變熱對處置場溫度、飽和度、及有效應力的影響。研究中考慮「深地層多孔處置設施」之空間配置，以「代表體積單元」之概念建立三維有限元素數值模型；並採行一迭代運算方案，求解T-H-M 耦合之複雜行為。在分析的參數方面，觀察熱傳導材料參數對處置場尖峰溫度之影響，並討論處置孔間距尺寸對耦合行為的影響，據以評估適合之尺寸，期能提供處置場設計參考。

關鍵字

用過核燃料 ； 深地層處置場 ； 熱－水力－力學耦合效應 ； 代表體積單元

並列摘要

The aim of this research is to analyze the transient T-H-M coupling behavior for a multiple geologic barrier system in the near field of deep spent nuclear fuel repositories, where preliminary design concept for the disposal project in Taiwan was proposed by the Institute of Nuclear Energy Research. In order to properly simulate the multiple barrier system, a three-dimensional numerical model based on the idea of ‘representative volume unit’ is presented. Also, an effective iterative computational scheme is adopted for solution of the complicated transient T-H-M coupling behavior. Finite element analyses are first carried out to predict the effects of the influencing factors resulting from in-situ thermal material properties. Also, by varying the extent of space between deposition holes, a series of calculations are conducted to evaluate the distributions of temperature, saturation, and effect stresses. The numerical results are anticipated to be applicable for future reference in practical engineering design.

並列關鍵字

spent nuclear fuel ； deep geologic repositories ； T-H-M coupling effect ； representative volume unit