• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.11 no.3
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• pp.253-257
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• 2013

Geology, hydrogeology, and geochemistry are the main technical siting factors of a geological repository for spent nuclear fuels. This paper evaluated the siting criteria of overseas geological repository with related to hydrogeologic properties, such as hydraulic conductivity, partitioning coefficient, dispersion coefficient, boundary condition, and water age. Each country establishes the siting criteria based on its important geological backgrounds and information, and social environment. For example, Sweden and Finland that have decided a crystalline rock as a host rock of a geological repository show different siting criteria for hydraulic conductivity. In Sweden, it is preferable to avoid area where the hydraulic conductivity on a deposition hole scale (~30m) exceeds $10^{-8}m/s$, whereas Finland does not decide any criterion for the hydraulic conductivity because of limited data for it. In addition, partitioning coefficients should be less than 10-1 of average value in Swedish crystalline bedrock. However, the area where shows 100 times less than average partitioning coefficients of radionuclides in crystalline rock should be avoided in Sweden. In German, the partitioning coefficients for the majority of the long-term-relevant radionuclides should be greater than or equal to $0.001m^3/kg$. Therefore, it is strongly required to collect much and exact information for the hydrogeologic properties in order to set up the siting criteria.

• Geophysics and Geophysical Exploration
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• v.24 no.1
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• pp.20-27
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• 2021

Subsurface rock produces heat from the decay of radioactive isotopes in constituent minerals and gamma-ray emissions, of which the magnitude is dominated by the contents of the major radioactive isotopes (e.g., U, Th, and K). The heat production is generally calculated from the rock density and contents of major isotopes, which can be determined by mass spectrometry of drilled core samples or rock fragments. However, such methods are not easily applicable to deep boreholes because core samples recovered from depths of several hundred meters to a few kilometers are rarely available. A geophysical logging technique for boreholes is available where the U, Th, and K contents are measured from the gamma-ray spectrum. However, this technique requires the density to be measured separately, and the measurement depth of the equipment is still limited. As an alternative method, a normal gamma-ray logging tool was adopted to estimate the heat production from the total gamma activity, which is relatively easy to measure. This technical report introduces the development of the proposed method for evaluating the heat production of a granitic rock mass with domestic commercial borehole logging tools, as well as its application to a ~2 km deep borehole for verification.

• Economic and Environmental Geology
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• v.56 no.5
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• pp.533-545
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• 2023

In this study, an investigation was conducted on the features, events, and processes (FEP) that could impact the long-term safety of the natural barriers constituting high-level radioactive waste geological repositories. The FEP list was developed utilizing the IFEP list 3.0 provided by the Nuclear Energy Agency (NEA) as foundational data, supplemented by geological investigations and research findings from leading countries in this field. A total of 49 FEPs related to the performance of the natural barrier were identified. For each FEP, detailed definitions, classifications, impacts on long-term safety, significance in domestic conditions, and feasibility of quantification were provided. Moreover, based on the compiled FEP list, three scenarios that could affect the long-term safety of the disposal facility were developed. Geological factors affecting the performance of the natural barrier in each scenario were selected and their relationships were visualized. The constructed FEP list and the visualization of interrelated factors in various scenarios are anticipated to provide essential information for selecting and organizing factors that must be considered in the development of mathematical models for quantitatively evaluating the long-term safety of deep geological repositories. In addition, these findings could be effectively utilized in establishing criteria related to the key performance of natural barriers for the confirmation of repository sites.

• 건강소식
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• v.37 no.2
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• pp.22-23
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• 2013

가족과 친척, 친지들이 모여 오순도순 이야기꽃을 피우고 정을 나누는 시간. 누구나 바라는 설날 풍경이다. 그런데 현실은 이와 다르기 일쑤다. 설날이 다가올수록 아내의 짜증지수는 치솟고 남편은 그런 아내 눈치 살피기에 전전긍긍한다. 심지어 설날 때마다 두통이나 복통을 호소하는 이도 적지 않다. 명절 이후 이혼상담 비율이 높아지는 것은 또 어찌 설명할까. 이른바 명절증후군이다. 그런데, 이 같은 명절증후군을 극복하고 정답고 행복하게 설날을 보낼 방법은 없을까.

• 건강소식
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• v.34 no.8
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• pp.26-27
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• 2010

바쁜 일상에 주위를 둘러볼 시간적 여유가 없는 도시인이라도 잠깐 눈을 돌려보면 주위에 다양한 식물들의 색다른 모습을 즐길 수 있다. 자귀나무는 가로수나 정원수로 많이 심지만 그리 많이 알려진 식물이 아니다 보니 그냥 지나치는 경우가 많다. 하지만 자귀나무에 대해 조금만 관심을 기울이면 그 매력에 푹 빠지게 된다.

• 전기의세계
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• v.42 no.2
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• pp.5-11
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• 1993

저자파가 인체에 미치는 영향을 개설하고 불필요한 전자파 잡음이 산업기기에 오동작을 일으켜 산업재해를 유발시킬 수 있다는 것을 간략히 설명하였다. 전자파가 우리들의 일상생활에 도움을 주기도 하며 건강을 해치기도 하고, 심지어는 불필요한 전자파가 2차재해를 유발하여 생산현장 근무자의 생명까지 앗아가기도 한다. 이러한 불요 전자파를 적절히 제어 운용하기 위하여 우리는 모든 지혜를 동원해야 할 것으로 생각된다.

• 대한치주과학회:학술대회논문집
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• 2005.11a
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• pp.210-211
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• 2005

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2003.11a
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• pp.388-393
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• 2003

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.458-463
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• 1998

고준위방사성페기물의 기준 처분시스템 (Reference Geological Disposal System)의 개념설정을 위하여 현재 국내 원전에서 발생되고 있거나 향후 2010까지 건설될 원전으로부터 발생될 모든 사용 후 핵연료연료의 특성(크기, 무게, 초기농축도, 연소도, 냉각기간 등)을 대표할 수 있는 기준 사용 후 핵연료를 선정하였다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2008.11a
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• pp.88-89
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• 2008