Corrosion assessment for spent nuclear fuel disposal in crystalline rock, using variant cases of hydrogeological modelin
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Corrosion assessment for spent nuclear fuel disposal in crystalline rock, using variant cases of hydrogeological modeling Chi-Che Hung1 • Fraser King2 • Yun-Chen Yu1 • Chi-Jen Chen1 • Yuan-Chieh Wu1 Wei-Ting Lin3
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Received: 10 July 2020 / Revised: 10 September 2020 / Accepted: 14 September 2020 China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract This paper presents a corrosion assessment of copper spent nuclear fuel disposal canisters in crystalline rock, using hydrogeological modeling. A simplified approach is considered, to avoid complex and time-consuming computer simulations. This simplified case is presented as a base case, with changes in the hydrogeological parameters presented as variant cases. The results show that in Taiwan’s base case, decreasing the hydraulic conductivity of the rock or decreasing the hydraulic conductivity of dikes results in a shorter transport path for sulfide and an increase in corrosion depth. However, the estimated canister failure time is still over one million years in the variant cases. Keywords Spent nuclear fuel disposal Corrosion assessment Hydrogeological modeling
This work was supported by the Taiwan Power Company (TPC) (No. 0780509001). & Wei-Ting Lin [email protected] 1
https://www.iner.gov.tw
2
https://www.prci.org/Research/PRCIDirectory/9974.aspx
3
https://www.niu.edu.tw
1 Introduction The Taiwan Power Company (Taipower) is currently in the process of demonstrating the feasibility and capability of deep geological disposal of the country’s spent nuclear fuel. The current concept is based on the Swedish KBS-3 approach, suitably modified for Taiwanese conditions. In collaboration with the Institute of Nuclear Energy Research (INER), a reference case is being developed to demonstrate the feasibility of the concept, as part of the Feasibility Assessment Report for the Spent Nuclear Fuel Final Disposal Technology in Taiwan (abbreviated as ‘‘SNFD2017’’). The disposal facilities are designed on the principle of using crystalline rock as a natural barrier. The sub-surface facilities consist of engineered barriers (copper shell canister, buffer, backfill, closure, and plug) around the underground disposal locations. The floor of the deposition tunnel is designed at 500 m depth. The nearest distance between the repository and the Taiwushan fault is 350 m, and the Taiwushan fault-branch is at least 550 m away. The alignment of the deposition tunnel is perpendicular to a dolerite dike, and the distance between dike and repository is 100 m. The repository has a total of 62 tunnels. Each disposal tunnel is 300 m in length and can accommodate 44 deposition holes [1]. In any geological disposal environment, the canister will be subject to corrosion, and it is necessary to assess the rate and extent of corrosion over long periods of time, with the aim of confirming the primary
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