• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.8 no.2
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• pp.167-172
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• 2010

CANDU spent fuel is to be disposed of at repository finally rather than recycled because of its low fissile nuclide concentration. But the difficult situation of finding a repository site can not help introducing a interim storage in the short term. It is required to find an optimum timing of geological disposal of CANDU spent fuels related to the interim storage operation period. The major factors for determining the disposal starting time are considered as safety, economics, and public acceptance. Safety factor is compared in terms of the decay heat and non-proliferation. Economics factor is compared from the point of the operation cost, and public acceptance factor is reviewed from the point of retrievability and inter-generation ethics. This paper recommended the best solution for the disposal starting time by analyzing the above factors. It is concluded that the optimum timing for the CANDU spent fuel disposal is around 2041 and that the sooner disposal time, the better from the point of technical and safety aspects.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.17 no.4
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• pp.405-418
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• 2019

Based on spent fuels characteristics from domestic nuclear power plants and a disposal scenario from the current basic plan for high-level radioactive waste management, an improved disposal system has been proposed that enhances disposal efficiency and economic effectiveness compared to the existing disposal system. For this purpose, two disposal canisters concepts were derived from the length of the spent fuel generated from the nuclear power plants. In the disposal scenario, the acceptable amount of decay heat for each disposal container was determined, taking into account the discharge and disposal times of spent fuels in accordance with the current basic plan. Based on the determined decay heat of the two types of disposal canisters and the associated disposal system, thermal stability analyses were performed to confirm their suitability to the proposed disposal system design requirement and disposal efficiency assessment. The results of this study confirm 20% reduction in the disposal area and 20% increase in disposal density for the proposed disposal system compared to the existing system. These results can be used to establish a spent fuel management policy and to design a viable commercial disposal system.

• KOREAN POULTRY JOURNAL
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• v.53 no.8
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• pp.120-123
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• 2021

지난해 11월부터 올해 4월까지 약 5개월간 발생한 고병원성 조류인플루엔자로 산란계는 184농가에 16,745천수로 전체 23%에 해당되는 마리수가 살처분되면서 산업이 여전히 불안정한 상황이다. 특히나 정부는 AI 발생농장 외에도 반경 3km의 농가 모두 예외 없이 살처분을 감행했고, 입식 시점에서는 턱없이 부족한 정부 보상 기준과 현실에 맞지 않는 정책으로 그 고통은 농가가 고스란히 떠안고 있다. 본회 채란위원회 차원에서 조직 활동 중인 'AI 살처분 농가 비상대책위원회' 황승준 AI 비대위원장을 만나 최근까지 활동과 농가의 요구사항에 대해 인터뷰한 내용을 정리했다.

• The Journal of the Korea Contents Association
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• v.13 no.5
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• pp.223-233
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• 2013

As the injunctive effect on the real estate gets announced in public once the seizure register gets exercised in terms of auction and the action of disposal by the real estate owner afterwards becomes nullified in the relationship with a seizure creditor or a successful bidder, the register performed by the cause of disposal action that cannot confront with the seizure or provisional seizure, becomes cancelled in virtue of a registration officer's office. Accordingly, in case of being a singular successor who relatively loses property in a relationship toward the successful bidder due to the injunctive effect of provisional seizure, the identity with building owner and land owner as the precondition of establishing legal superficies according to the custom must be decided based on the time of provisional seizure. The Supreme Court Decision 2010Da52140 delivered on October 18, 2012 has great significance from the fact that it has settled inconsistency in existing precedent cases with such purpose.

• Tunnel and Underground Space
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• v.16 no.4 s.63
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• pp.307-312
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• 2006

Radionuclide released from corroded container migrates through groundwater flow pathway in the underground rock. Therefore it is important to study the groundwater flow analysis for total system performance assessment of a HLW repository. In this study assuming a geological change of underground rock in future, the two dimensional groundwater flow analysis is done by the NAMMU, the assessment code for groundwater flow in porous media. Assuming the hypothetical repository with the reactivation of fault in the vicinity of it, the effect of change in aperture and permeability by reactivation of fault around a repository on groundwater pathway is studied.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.17 no.2
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• pp.183-202
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• 2019

For design and performance assessment of a high-level radioactive waste (HLW) disposal system, it is necessary to understand the characteristics of coupled thermo-hydro-mechanical (THM) behavior. However, in previous studies for the Korean Reference HLW Disposal System (KRS), thermal analysis was performed to determine the spacing of disposal tunnels and interval of disposition holes without consideration of the coupled THM behavior. Therefore, in this study, TOUGH2-MP/FLAC3D is used to conduct THM modeling for performance assessment of the Korean Reference HLW Disposal System (KRS). The peak temperature remains below the temperature limit of $100^{\circ}C$ for the whole period. A rapid rise of temperature caused by decay heat occurs in the early years, and then temperature begins to decrease as decay heat from the waste decreases. The peak temperature at the bentonite buffer is around $96.2^{\circ}C$ after about 3 years, and peak temperature at the rockmass is $68.2^{\circ}C$ after about 17 years. Saturation of the bentonite block near the canister decreases in the early stage, because water evaporation occurs owing to temperature increase. Then, saturation of the bentonite buffer and backfill increases because of water intake from the rockmass, and bentonite buffer and backfill are fully saturated after about 266 years. The stress is calculated to investigate the effect of thermal stress and swelling pressure on the mechanical behavior of the rockmass. The calculated stress is compared to a spalling criterion and the Mohr-Coulumb criterion for investigation of potential failure. The stress at the rockmass remains below the spalling strength and Mohr-Coulumb criterion for the whole period. The methodology of using the TOUGH2-MP/FLAC3D simulator can be applied to predict the long-term behavior of the KRS under various conditions; these methods will be useful for the design and performance assessment of alternative concepts such as multi-layer and multi-canister concepts for geological spent fuel repositories.

• The Korean Society of Law and Medicine
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• v.20 no.1
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• pp.25-43
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• 2019

This study analyzed the problem of the time difference of medicine price cut in Korea according to the administrative and judicial process and sought to present the amendment in the related law to achieve substantial fairness. We considered unfairness of medicine price cut caused by the administrative and judicial process in three situations, the approval-patent linkage system, realistic differences in the practice of administration and suspension of price cut execution. Based on it, we reasoned out the solution to get substantial fairness in the administrative and judicial process of medicine price cut in Korea. Although each step of the administrative and judicial process is lawful and reasonable, the time difference of medicine price cut according to the administrative and judicial process can result in damages or windfall to both of pharmaceutical company and National Health Insurance Service. In the present legal system of Korea, it is unable to be correct. Thus, we present the amendment to correct the damages and windfall when it happens.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.447-452
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• 1998

우리나라에서도 고준위폐기물 처분시설의 장기안전성 확보를 위한 기초연구가 시작되고 있어 안전성 기준에 대한 논의가 필요한 시점이다. 여기서는 고준위폐기물 처분시설의 안전성 기준에 대한 국제기관들의 권고하는 기준들을 조사하고, 현재 여러 나라에서 제안되거나 개정중에 있는 기준들을 비교 분석하였다. 안전성기준에서의 큰 차이점은 유도기준의 필요성(현재 미국만의 유도기준을 사용), ALARA 적용문제, 종합적 위험도 적용방법론의 문제, 위험도 수준등에서 나타나고 있으며, 특히 미래 상황의 불확실성 때문에 현재 및 개 국가에서 제시하고 있는 안전성평가기간 (10,000면)은 계속 논란이 일 것으로 보인다. 미래 예측이 어느 정도 가능한 최소한의 기간(수천년 혹은 만년)까지는 위험도를 기준으로, 그리고 그 이후는 지표로의 누출율을 기준으로 정하는 것도 바람직한 대안이 될 것으로 생각된다. 또한 안전성기준은 설계자로 하여금 대안분석을 통한 최적화를 방해하는 구체적인 유포기준보다는 융통성을 어느 정도 부여하는 방향으로 설정되는 것이 바람직한 것으로 사료된다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.14 no.3
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• pp.253-266
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• 2016

In accordance with the classification system of radioactive waste in Korea, all the disused sealed radioactive sources (DSRSs) fall under the category of EW, VLLW or LILW, and should be managed in compliance with the restrictions for the disposal method. In this study, the management and disposal method are drawn in consideration of half-life of radionuclides contained in the source and A/D value (i.e. the activity A of the source dividing by the D value for the relevant radionuclide, which is used to provide an initial ranking of relative risk for sources) in addition to the domestic classification scheme and disposal method, based on the characteristic analysis and review results of the management practices in IAEA and foreign countries. For all the DSRSs that are being stored (as of March 2015) in the centralized temporary disposal facility for radioisotope wastes, applicability of the derivation result is confirmed through performing the characteristic analysis and case studies for assessing quantity and volume of DSRSs to be managed by each method. However, the methodology derived from this study is not applicable to the following sources; i) DSRSs without information on the radioactivity, ii) DSRSs that are not possible to calculate the specific activity and/or the source-specific A/D value. Accordingly, it is essential to identify the inherent characteristics for each of DSRSs prior to implementation of this management and disposal method.

• The Korean Journal of Financial Studies
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• v.3 no.2
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• pp.187-201
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• 1996

IPO주의 단기성과에 대한 연구는 많이 진전이 되었다. 그러나 장기성과에 대한 연구는 아직 미진한 상태이다. IPO주가 단기적으로는 초과수익을 실현한다는데 대하서는 거의 합일점을 찾은 듯하다. 한국 시장의 경우도, IPO주의 장기성과에 대하서는 3편 정도에 그치고 있다. 본 연구는 IPO주의 장기성과와 대주주의 지분변과의 관련성을 검증하는데 초점을 두었다. 실증 결과로는, 기업은 공개시점을 대체로 그 기업의 기업가치의 최대점으로 잡아 공개를 결정한다는 것과 공개후 5개월이란 시점에서 누족초과수익이 가장 정점을 이루며, 21개월 후에 안정을 찾는데는 경향을 알아내었다. 또한 대주주의 지분을 많이 처분하는 기업의 장기성과가 떨어짐을, 그리고 공개후 시간이 지날수록 장기성과가 떨어짐을 조심스럽게 추론할 수가 있었다.