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Kafe 바로가기주관연구기관 | 한국지질자원연구원 Korea Institute of Geoscience and Mineral Resources |
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연구책임자 | 김유홍 |
참여연구자 | 권창우 , 김명선 , 김은경 , 김태희 , 김형찬 , 남욱현 , 박인화 , 석희준 , 송원경 , 양기창 , 이병춘 , 이성곤 , 이영민 , 정병주 , 진광민 , 채병곤 , 천대성 , 현성필 , 오석훈 , 이광률 , 최정해 |
보고서유형 | 1단계보고서 |
발행국가 | 대한민국 |
언어 | 한국어 |
발행년월 | 2021-12 |
과제시작연도 | 2021 |
주관부처 | 과학기술정보통신부 Ministry of Science and ICT |
등록번호 | TRKO202200010202 |
과제고유번호 | 1711133991 |
사업명 | 한국지질자원연구원연구운영비지원(R&D)(주요사업비) |
DB 구축일자 | 2022-10-06 |
키워드 | 고준위방사성폐기물.심층처분.암종.심부시추연구.핵심평가인자.high-level radioactive waste.deep geological disposal.rock type.deep drilling research.key evaluation parameters. |
Ⅳ. 연구개발결과
1. 화강암 평가인자 DB구축
◦ 기존 사업에서 선정한 부지선정 일반평가인자 100여개 중에서 중요성에 따라서 화강암의 분야별 주요평가인자 선정 완료
◦ 원주, 춘천 시추공과 시추코어를 이용하여 지질분야, 역학분야, 물리탐사분야, 지화학분야, 수리지질분야, 지열분야 별 화강암 주요평가인자 DB 구축 완료
2. 화강암 조사·분석 표준절차서 작성
◦ 주요평가인자에 대한 이론, 실험장비, 실험절차, 평가방법 등을 정리 완료
◦ 주요평가인자의 평가를 위해서 화강암 심부시추조사 시에 필요한
Ⅳ. 연구개발결과
1. 화강암 평가인자 DB구축
◦ 기존 사업에서 선정한 부지선정 일반평가인자 100여개 중에서 중요성에 따라서 화강암의 분야별 주요평가인자 선정 완료
◦ 원주, 춘천 시추공과 시추코어를 이용하여 지질분야, 역학분야, 물리탐사분야, 지화학분야, 수리지질분야, 지열분야 별 화강암 주요평가인자 DB 구축 완료
2. 화강암 조사·분석 표준절차서 작성
◦ 주요평가인자에 대한 이론, 실험장비, 실험절차, 평가방법 등을 정리 완료
◦ 주요평가인자의 평가를 위해서 화강암 심부시추조사 시에 필요한 현장실험, 실내실험 조사·분석 표준절차서를 6개 분야별로 기술 완료
3. 화강암 핵심평가인자 분포범위 기술보고서 작성
◦ 화강암 암종에 대한 핵심평가인자로 암종, 단열밀도, 일축압축강도, 원위치 응력, 절리분포, 암반분류, 물리검층, 지화학인자, 수리전도도 등을 선정
◦ 핵심평가인자에 대한 처분 선도국의 연구현황, 기존 국내 연구 결과, 현 사업의 시추공을 이용하여 획득한 자료 등의 분포범위 기술 완료
4. 화강암과 퇴적암 750 m 급 시추공 2공 확보
◦ 원주 KSRS, 춘천 강원대 화강암 부지에 각각 757.3 m, 751.2 m 시추조사 완료
◦ 진주 경상대, 대구 경북대 퇴적암 부지에 각각 754.3 m, 750.9 m 시추조사 완료
5. 화강암반 대상의 국제 프로젝트 참여와 모델링 수행
◦ MaCoTe 국제공동 프로젝트에 참여하여 국내 화강암 암종의 지화학적 장기안정성 평가를 위한 키감 모듈 1 제작
◦ 고정밀도 핵종 물질 수지 계산을 위한 새로운 포트란 알고리즘을 완성
◦ 심부 지하수-지열 연동 개념 모델 개발을 위한 단열대 시추자료 통계분석에 근거한 단열망 모델링 수행
(출처 : 요약문 8p)
Detailed surface geological and deep drilling investigations were conducted focusing on Jurassic granites (Wonju and Chuncheon granites) and Cretaceous sedimentary rocks (Jinju and Daegu Formations) for understanding the deep geological characteristics. Various studies have been conducted on the fou
Detailed surface geological and deep drilling investigations were conducted focusing on Jurassic granites (Wonju and Chuncheon granites) and Cretaceous sedimentary rocks (Jinju and Daegu Formations) for understanding the deep geological characteristics. Various studies have been conducted on the four 750 m drilling cores recovered through drilling. Various information on characteristics of geology and geological structures in depth was produced through the detailed logging and various analyzes on the recovered drilling cores such as age dating, rock formation, sedimentation environments, fractures and faults, etc. This information will facilitate the evaluation of the parent rock characteristics of the HLW geological disposal.
To trace the history of sea-level fluctuations in the past, drilling samples from the estuaries of the Seomjin River and Nakdong River were comprehensively reviewed. There is a 15m difference between the elevations of the sedimentary surfaces of about 9000 years ago and 6,000 years ago between the Seomjin River and the Nakdong River. As the reason, the difference in the original topography or the effect of uplift-subsidence can be considered.
A specification for geoscientific investigation for the evaluation of deep geological properties of granite and mudstone rocks was prepared, and 750 m deep drilling was performed in granite and mudstone bedrock using this. As key and major parameters in rock mechanics, four parameters were selected, such as uniaxial compressive strength, in situ stress, joint distribution, and rock mass classification, and the survey was conducted according to the proposed standard procedure(draft), and the distribution range along with the DB for each parameter was estimated.
Geophysical logging was conducted to obtain geophysical properties of the granite(Wonju, Chuncheon) and sedimentary(Jinju, Daegu) rock formation. The investigation program includes the following methods: 1) 3-Arm Caliper, 2) fluid temperature and electrical conductivity with natural gamma radiation, 3) normal resistivity and single point resistance(SPR), 4) gamma-gamma density, 5) full waveform sonic, 6) spectral gamma, and 7) acoustic televiewer imaging. The database of the primary geophysical properties with depth in the rock formations were constructed from the geophysical logging data through a series of data processing techniques. The data processing procedures for geophysical logging are depth alignment (length adjustment) with core lithology and fractures, standard data correction and conversion, fracture extraction and feature analysis, and velocity analysis estimation for the secondary geo-environment assessment factor, such as dynamic elastic properties of the rocks. Geophysical properties for deep geo-environment assessment factors for Wonju and Chuncheon Granite and the range of those values are also presented.
The geochemistry team performed a series of R & D activities during 2020 and 2021 to secure the technology required for the geochemical evaluation of a site for deep geological disposal of high-level radioactive waste. First, we identified the necessary parameters in evaluating the geochemical characteristics of a site. Fourteen parameters for hydrogeochemical and mineralogical evaluation and four for radionuclide behavior were selected based on a literature survey. Among them, we determined dissolved oxygen (DO) and adsorption distribution coefficient as the critical parameters considering their significance in the safety function of a site. Second, we drafted a standard procedure for a deep hydrochemical investigation. Third, we conducted deep hydrochemical investigations using a deep borehole drilled in a model granite body in Wonju, Korea. The in situ water quality parameters were measured, and groundwater samples for lab measurements of water quality parameters were collected from eight test sections in the 750-m borehole. We compiled the water quality parameter values to build a granite hydrochemical database. Four, we monitored long-term changes in the hydrogeochemical parameters from the Wonju granite borehole. Five, we conducted a preliminary investigation of the hydrochemical properties of a model mudstone borehole system in Jinju, Korea. We used a newly-developed gas-pressurization groundwater sampling system. Finally, we continued to participate in the multi-national MaCoTe project organized by Nagra. The KIGAM module of MX-80 bentonite loaded with carbon steel and copper coupons treated with sulfide or sulfate was inserted in the Grimsel Test Site borehole in 2021. Our research will contribute to technologies and standard procedures necessary for evaluating a disposal site, leading to the transparent implementation of the HLW disposal project.
To optimize placing high-level radioactive waste sites, we selected critical hydrogeological parameters and described surveying and modeling methods for these parameters, including similar examples from leading countries. We also statistically evaluated characteristics of hydraulic conductivity in shallow aquifer at granite areas and performed various hydraulic tests for obtaining in-depth hydraulic conductivity at KSRS site in Wonju city in granite area. Then we estimated the hydraulic conductivity of the granite bedrock on-site based on a statistically-similar fracture network model for improving the accuracy of a coupled groundwater flow and heat transport model. Besides, we made practical manual on theories and methods of various hydrogeological field test for deep hydrogeological characterization. A new algorithm technique of local mass balance calculations for modeling the behavior of nuclides was developed, which would be useful tool in the design of future risk assessment and monitoring of high-level radioactive waste sites.
(source : SUMMARY 9p)
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