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State-of-the-art report on in-situ validation research of high-level nuclear waste disposal at KAERI

State-of-the-art report on in-situ validation research of high-level nuclear waste disposal at KAERI

authors: J.S. Kim, G.Y. Kim, C. Lee, S-H. Ji, K.W. Park, Y.C. Choi, S. Yoon, W.J. Cho, J.O. Lee, M.S. Lee, N.Y. Ko, D.K. Park, S.Y. Lee, J.S. Kwon, J.K. Lee, D.K. Cho

Korea Atomic Energy Research Institute·2020-01-01

  • 188쪽
  • 210×297mm
  • 기술과학

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책 소개

Validating the performance of a nuclear waste disposal system greatly contributes to decreased uncertainty in the long-term safety of high-level waste repositories. It also improves public confidence in nuclear safety. The in-situ performance of a waste disposal system, including its primary components, such as the engineered barrier system (EBS), should be verified to enhance the credibility of nuclear safety. In this context, this report summarizes various in-situ tests conducted in the Korea Atomic Energy Research Institute (KAERI) Underground Research Tunnel (KURT) and numerical analyses since 2006. A coordinated research program on numerical analysis and code development is also introduced. The report is divided into two parts: Phase I, covering research carried out before the KURT expansion, and Phase II, covering research conducted after the expansion. Various in-situ tests have been performed to validate the EBS performance. These tests include borehole heater tests to investigate the thermal, hydraulic, and mechanical behaviors of the near-field rock mass, excavation damage zone characterization, and observation of elastic wave propagation through the rock mass. In addition, the In-situ Demonstration of Engineered Barrier System test is currently underway to analyze the thermo-hydro-mechanical coupled behaviors of the EBS in KURT. The natural barrier was also studied via in-situ tests, such as solute migration tests, tests on major water-conducting features, tracer tests, monitoring of hydro- and geochemistry, and evaluation of groundwater colloids. This report will be continuously updated according to the current and future in-situ tests in KURT and explains the past and present status of in-situ validation technologies of waste disposal at KAERI.

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Summary Chapter 1. IntroductionChapter 2. In-situ Validation of Waste Disposal: Phase ISection 1. Characterization of Near-field Rock Mass I1. Mechanical properties of Near-field Rock Mass2. Hydraulic properties of Near-field Rock Mass3. Thermal properties of Near-field Rock Mass4. Dynamic properties of Near-field Rock Mass5. In-situ Evaluation of Solute Migration in Fractured Rock 6. Characteristics of Major Water-Conducting Features 7. Monitoring Hydraulic and Geochemical Properties Section 2. Characterization of Engineered Barrier of Disposal System 1. KENTEX Experiment2. Heater Test3. Long-term Disposal Canister Corrosion4. Heat Transfer Properties of Tunnel Atmosphere 5. Microbial Processes in Buffer and Rock Interface Chapter 3. In-situ Validation of Waste Disposal: Phase IISection 1. Characterization of Near-field Rock Mass and Natural Barrier II1. Physical Properties of Discontinuities in Near-Field Rock Mass2. Heater Test Over-coring 3. Tracer Test4. KURT-LOT Experiment5. In-situ Elastic Wave Propagation and Attenuation 6. In-situ Estimation of Dynamic Properties7. Quantitative Assessment of Rock Integrity 8. In-Situ Demonstration of Engineered Barrier System Test Site Properties Section 2. Characteristics of Engineered Barrier System II1. KENTEX-C Experiment2. Laboratory thermo-hydro experiment 3. LOT Experiment 4. In-DEBS Experiment5. Basic Properties of Bentonite Buffer 6. Bentonite Buffer Properties under Coupled THM Conditions 7. Evaluation of Low-pH Cement Grout PropertiesChapter 4. Numerical Modeling of Disposal SystemSection 1. Numerical Modeling of Natural Barriers 1. Site Descriptive Modeling 2. Rock Mechanics Modeling of KURT Expansion AreaSection 2. Numerical Analysis of Engineered Barriers1. Numerical Modeling of Excavation Damaged Zones2. Numerical Modeling of Borehole Heater TestChapter 5. International Cooperation Section 1. International Joint Research on Numerical Analysis1. SKB Task 7 Project2. SKB Task 8 Project3. SKB Task 9 Project4. DECOVALEX-2011 5. DECOVALEX-2015 6. DECOVALEX-2019 Section 2. International Joint Research on In-situ Validation1. Sandia Nation Laboratory 2. Nuclide Behavior In-situ Validation Test (Colloid Formation and Migration)3. Natural Analogue Working GroupChapter 6. Conclusions and Future Plans

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