A Two Dimensional Simulation of Coupled Thermal and Hydraulic Behavior of Rocks with Two Excavated Holes Using Finite Element Method

• Main Authors: Yi-han Tseng, 曾憶涵
• Other Authors: Chihsen T. Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/03068747150480722118

碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 100 === The issue of final disposal of high-level radioactive waste has been highly concerned in the advanced countries using nuclear energy because the nuclide existing in the waste having the character of extremely long half-life endangers the environment for a very long period. Therefore, the waste has to be completely isolated from the biosphere. However, as the high-level radioactive waste has been always produced with the generation of nuclear power, the relevant research and development work have to be continuously processed. As the hard work has been conducted all over the world for a long time, the research results related to several fields, such as safety, technology, and economics, demonstrate that the Deep Geologic Disposal method is the most secure and efficient method for the final disposal of high-level radioactive waste. In this research, a 2-D coupled thermo-hydraulic analysis using finite element method had been conducted using the FEHM (Finite Element Heat and Mass transfer code) program originally developed by US Los Alamos National Laboratory in 1988. In addition, the layout of conceptual design of disposal site, Swedish KBS-3V, and the material parameters related to thermal and hydraulic properties obtained from SKB and JNC was employed were employed. This research is composed of three categories of numerical analysis using the FEHM program. (1) The verification of the FEHM program was conducted by comparing the Avdonin analytical solution and numerical solution. (2) The temperature and pressure distributions with time in the disposal site were obtained through the numerical simulation of the disposal of nuclear waste in the deep underground rocks. (3) The sensitivity analysis of the coefficient of permeability of bentonite (buffer) for the temperature and pressure distributions in the disposal site was conducted.