• Title/Summary/Keyword: Alternative disposal option

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Deep Borehole Disposal Concept of Spent Fuel for Implementation in Korea (사용후핵연료의 심부시추공 처분 개념의 국내 적용성 분석)

  • Yun, SooHyun;Kim, Chang-Lak
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.11 no.4
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    • pp.303-309
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    • 2013
  • As an alternative of the spent fuel disposal in a geologic repository, a deep borehole disposal concept for disposal at the section of 3 - 5km deep in a borehole has been proposed in several countries. In this paper, the latest reports of Sandia National Laboratories on the borehole disposal researches are analyzed. For implementation of this disposal concept in Korea, a conceptual design of spent fuel disposal canister and a modified deep borehole concept are suggested along with a required disposal area.

ASSESSMENT OF THE COST OF UNDERGROUND FACILITIES OF A HIGH-LEVEL WASTE REPOSITORY IN KOREA

  • Kim, Sung-Ki;Choi, Jong-Won
    • Nuclear Engineering and Technology
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    • v.38 no.6
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    • pp.561-574
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    • 2006
  • This study presents the results of an economic analysis for a comparison of the single layer and double layer alternatives with respect to a HLW-repository. According to a cost analysis undertaken in the Korean case, the single layer option was the most economical alternative. The disposal unit cost was estimated to be 222 EUR/kgU. In order to estimate such a disposal cost, an estimation process was sought after the cost objects, cost drivers and economic indicators were taken into consideration. The disposal cost of spent fuel differs greatly from general product costs in the cost structure. Product costs consist of direct material costs and direct labor and manufacturing overhead costs, whereas the disposal cost is comprised of construction costs, operating costs and closure costs. In addition, the closure cost is required after a certain period of time elapses following the building of a repository.

KEY R&D ACTIVITIES SUPPORTING DISPOSAL OF RADIOACTIVE WASTE: RESPONDING TO THE CHALLENGES OF THE 21ST CENTURY

  • Miyamoto, Yoichi;Umeki, Hiroyuki;Ohsawa, Hideaki;Naito, Morimasa;Nakano, Katsushi;Makino, Hitoshi;Shimizu, Kazuhiko;Seo, Toshihiro
    • Nuclear Engineering and Technology
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    • v.38 no.6
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    • pp.505-534
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    • 2006
  • Ensuring sufficient supplies of clean, economic and acceptable energy is a critical global challenge for the 21st century. There seems little alternative to a greatly expanded role for nuclear power, but implementation of this option will depend on ensuring that all resulting wastes can be disposed of safely. Although there is a consensus on the fundamental feasibility of such disposal by experts in the field, concepts have to be developed to make them more practical to implement and, in particular, more acceptable to key stakeholders. By considering global trends and using illustrative examples from Japan, key areas for future R&D are identified and potential areas where the synergies of international collaboration would be beneficial are highlighted.

Mercury Emission Characteristics from Co-Combustion of Coal and Sludge (석탄과 슬러지의 혼합연소에 따른 수은 배출 특성)

  • Kang, Sin-Wook;Shim, Sung-Hoon;Jeong, Sang-Hyun;Jung, Jong-Hyeon;Lee, Sang-Sup
    • Journal of Korean Society for Atmospheric Environment
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    • v.28 no.2
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    • pp.182-189
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    • 2012
  • Co-combustion of sludge with coal is proposed as an alternative option for sludge disposal instead of ocean dumping. Because the combustion of sludge can cause emissions of various air pollutants, it is important to understand the characteristics of sludge combustion flue gases. Especially, very few studies are found to investigate mercury emissions from the co-combustion of sludge with coal. In this study, coal and sludge samples were prepared with different mixing ratios. These samples were combusted in a bench-scale combustor, and their flue gases were analyzed. Due to higher mercury content in the sludge sample, higher mercury emissions were found with an increase in a ratio of sludge to coal. Compared to the combustion flue gas of the coal sample, higher levels of mercury oxidation were found in the combustion flue gas of the samples including sludge.

Characteristics of Acidic Gas Emissions from Combustion with Preblending of Coal and Sludge (석탄과 슬러지의 예혼합연소에 따른 산성가스 배출특성)

  • Shim, Sung-Hoon;Jeong, Sang-Hyun;Min, Hyo-Ki;Lee, Sang-Sup
    • Journal of Korean Society of Environmental Engineers
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    • v.36 no.2
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    • pp.103-108
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    • 2014
  • Using dried sludge as a secondary fuel of a coal-fired power plant is proposed as an alternative option for sludge disposal. Because elemental contents of sludge are different from those of coal, different levels of acidic gas emissions are expected from the co-combustion of sludge with coal. In this study, sludge samples were obtained from 7 sewage treatment plants in Korea. Each sludge sample was combusted together with coal in a lab-scale combustor, and the concentrations of nitrogen oxides ($NO_x$), sulfur dioxide ($SO_2$), hydrogen chloride (HCl), chlorine ($Cl_2$) in the flue gas were analyzed. Compared to the combustion of coal only, $NO_x$ concentration was slightly higher in the flue gas from the co-combustion of coal and sludge. $SO_2$ emission increased with the combustion of sludge due to the higher content of sulfur in sludge than in coal. For most of the tested samples, the concentrations of HCl and $Cl_2$ were varied depending on the chlorine content in the sludge sample.