• Nuclear industry
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• v.26 no.11 s.285
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• pp.82-93
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• 2006

• 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.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1998.10a
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• pp.377-380
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• 1998

방사능 핵폐기물 처분장 부지선정을 위해서는 암반의 특성화 작업이 선행되어야 한다. 특성화 작업이 선행되어야 한다. 특성화 작업은 암반은 열적, 역학적 및 수리적 거동 특성을 분석할 수 있는 수치모델을 개발하여, 국내 환경에 적합한 설계안을 조기에 설립할 수 있는 Program을 포함해야 한다. 이러한 목적을 달성하기 위한 초기단계로서, 현대엔지니어링 주식회사는 이 분야에 40년 이상의 경험과 기술을 축적하고 있는 세계적인 핵관련 연구소인 미국 샌디아 국립연구소 (Sandia National Laboratories)와 공동연구 등을 통해 서로간의 기술간의 기술을 공유하자는 "상호 기술협정(MOU)"을 '98년 5월 21일 맺었다. 본 연구는 이러한 취지하에 진행하고 있는 전체 Program의 일부로서 기본계획을 발포하여 향후 기술개발에 참여할 수 있는 산학연 협동체 구성 및 역할 분담을 통한 기초연구를 수행하고, 2000년 초반기에 한국에서 대구될 수 있는 처분장 처리문제를 미리 수행하려는데 일차적인 목적이 있다.적인 목적이 있다.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.2
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• pp.107-114
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• 2007

Islanding of PV systems occurs when the utility grid is removed but the PV systems continue to operate and provide power to local loads. Islanding is one of the serious problems in an electric power system connected with dispersed power sources. This can present safety hazards and the possibility of damage to other electric equipments. In the passive method, the voltage and frequency of PCC are measured and it determines islanding phenomena if their values excess the allowed limits. If the real and reactive power of RLC load and those of the PV system are closely matched, islanding phenomena can't be detected by the passive methods. Several active methods were proposed to detect islanding operation in the region where the passive method can not detect it. The most effective method is SFS method which was suggested by Sandia National Laboratory. In this paper, a new islanding detection method using automatic phase-shift is proposed and its validity is verified through the simulation and experimental results.

• Tunnel and Underground Space
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• v.12 no.1
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• pp.52-69
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• 2002

The WIPP (Waste Isolation Pilot Plant), located 42km east of Carlsbad, New Mexico (NM), in bedded salt 655m below the surface, is a mined repository constructed by the US DOE for the permanent disposal of transuranic (TRU) wastes generated by activities related to defence of the US since 1970. Its historical disposal operation began in March 1999 following receipt of a final permit from the State of NM after a positive certification decision for the WIPP was issued by the EPA in 1998, as the first licensed facility in the US for the deep geologic disposal of radioactive wastes. The CCA (Compliance Certification Application) for the WIPP that the DOE submitted to the EPA in 1966 was supported by an extensive performance assessment (PA) carried out by Sandia National Laboratories (SNL), with so-called 1996 PA. Even though such PA methodologies could be greatly different from the way we consider for HLW disposal in Korea largely due to quite different geologic formations in which repository are likely to be located, a review on lots of works done through the WIPP PA studies could be the most important lessons that we can learn from in view of current situation in Korea where an initial phase of conceptual studies on HLW disposal has been just started. The objective of this art report is an overview of the methodology used in the recent WIPP PA to support the US DOE WIPP CCA and some relevant results completed by SNL.