• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2016.10a
• /
• pp.455-456
• /
• 2016

• Journal of the Korean Society of Radiology
• /
• v.11 no.1
• /
• pp.1-8
• /
• 2017

The U.S. NRC establishes a radiological criteria with regard to restricted or unrestricted use of nuclear plant site after decommissioning in NUREG-1757. According to this, a nuclear plant site can be released in a restricted way or unrestricted way only if a licensee demonstrates that the dose criteria is fulfilled after the site decontamination and remediation. In order to prove compliance with the radiological criteria of site release, LTP(License Termination Plan) must include the site release criteria, site characterization, final survey plan with major radionuclides and DCGL(Derived Concentration Guideline Levels), etc. Based on the decommissioning case of Rancho Seco nuclear power plant in the United States, this paper analyzed a method of setting the DCGL that can be applied to Kori NPP Unit 1 which will be permanently disabled in 2017.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.5 no.4
• /
• pp.427-434
• /
• 2017

The generation of construction waste can be divided into a decommissioning phase and a new construction phase, and most of the waste is generated at the decommissioning stage. However, recently, domestic new construction construction has expanded to 150 trillion yards per year, so construction work is increasing rapidly. Especially, as the size of the construction work with much waste of construction waste exceeds 100 trillion, the management of the amount of construction waste in the new construction site is required. Unlike the dismantling work site, the new construction site can separate waste generated by each property, and relatively low foreign matter content is generated. The purpose of this study was to investigate the amount of construction waste generated by new construction sites and to calculate the unit amount of construction waste based on this. In addition, since the existing unit cost is centered on concrete and mixed waste, we set the basic unit by setting synthetic resin, waste wood, and waste board as additional items. The basic unit survey was carried out to investigate the wastes according to the characteristics of each construction period. As a result of the survey, the new construction site showed that most wastes were discharged in the first 30% and after 70% of the process, and the ratio of mixed construction waste was as high as 45%. As a result of this study, it was found that about twice as much waste was produced as compared with the conventional standard product.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
• /
• v.17 no.2
• /
• pp.213-226
• /
• 2019

Regulatory agency and licensee are preparing for the site restoration of Kori unit 1, the first commercial NPP in Korea, scheduled for 2031. Developing regulatory guidelines and strategies is essential for effective restoration work. Unfortunately, Korea does not have experience of site restoration of commercial NPPs. Therefore, it is important to review cases from experienced countries to establish a strategy and regulatory standards. The U.S. has had numerous soil remediation experiences using RESRAD and MARSSIM. However, formalized evaluation methodologies for subsurface soil have not yet been established in MARSSIM. This survey focused on subsurface soil remediation by reviewing the five decommissioned NPPs under regulation of the US NRC. Overall process of remediating a contaminated subsurface soil and groundwater was reviewed to identify considerations and lessons that could be applicable in Korea. In addition, an applied methodology for evaluation of contaminated subsurface soil and related major issues between regulatory agency and licensees were reviewed in detail to support establishment of remediation strategy for Kori unit 1.

• Korea journal of population studies
• /
• v.27 no.2
• /
• pp.61-89
• /
• 2004

1990년 이후 중국 조선족 사회는 급격한 변화의 소용돌이에 휩싸여있다. 그 핵심에는 조선족 공동체의 총체적인 재구조화가 자리하고 있다. 조선족 집거지로부터 대규모의 이촌 현상이 나타나고 있으며 동북3성에 집중되어 있던 조선족은 전 중국으로 흩어지고 있다. 이러한 조선족의 이동은 조선족 공동체의 해체현상으로 이해되는 경향이 있다. 이 연구는 바로 인구이동이 조선족 사회와 공동체에 어떠한 영향을 주는지에 대한 물음에서 출발한다. 그리고 영향은 이동의 기원지인 농촌과 다양한 목표지의 현황과 조건, 이를 둘러싼 사회경제적 상황을 중심으로 다룬다. 이를 위해 사례연구를 실시하였으며, 필요한 자료는 선택된 마을의 방문과 현지에서의 심층면접을 통해 수집하였다. 연구의 결과는 조선족의 대규모, 원거리 이동이 조선족 공동체의 해체를 뜻하는 것은 아니라는 점을 명백히 보여준다. 인구유출로 도시 또는 조선족 중심지에서 떨어진 농촌 마을에서 공동체의 해체는 빠른 속도로 이루어진다. 그러나 조선족은 새로운 목표지에서는 새로운 유형의 집중현상을 보인다. 한마디로 조선족의 이동은 조선족 사회의 도시화의 경향과 함께, 보다 넓은 지역으로의 공동체의 분산과 공동체내에서의 높은 민족 집중성을 특징으로 전개되고 있다. 또한 조선족 도시 공동체는 거주지역의 격리보다는 민족성을 기초로 한 문화적 정체성에 대한 강조를 특징으로 한다.

• Resources Recycling
• /
• v.28 no.4
• /
• pp.51-58
• /
• 2019

Dismantlement of lithium primary batteries without explosion is required to recycle the lithium primary batteries which could be exploded by heating too much or crushing. In the present study, the optimum discharging condition was investigated to dismantle the batteries without explosion. When the batteries were discharged with $0.5kmol{\cdot}m^{-3}$ sulfuric acid, the reactivity of the batteries decreased after 4 days at $35^{\circ}C$ and after 1 day at $50^{\circ}C$, respectively. This result shows that higher temperature removed the high reactivity of the batteries. Because loss of metals recycled increases when the batteries are discharged only with the sulfuric acid, discharging process using acid solution and water was newly proposed. When the batteries were discharged with water during 24 hours after discharging with $0.5kmol{\cdot}m^{-3}$ sulfuric acid during 6 hours, the batteries discharged were dismantled without explosion. Because decrease in loss of metals was accomplished by new process, the recycling process of the batteries could become economic by the 2-step discharging process.

• Survey Research
• /
• v.11 no.3
• /
• pp.1-18
• /
• 2010

How much do people living in different communities vary in their survey responses? A few studies have examined the effect of the social environment on survey response. Making generalizations from these studies by looking at the effect of social environment on survey response is complicated due to differences in survey dimensions, including incentives, survey mode, types of response rates, and geographic levels. Using the 2000 Census Final Response Rates(CFRR) and the 2002 General Social Survey Response Rates(GSSRR) linked with the 2000 Census in the United States, we attempt to understand how community characteristics associated with survey cooperation vary between data sets. We found that people living in poor area are less likely to cooperate with the Census but more likely to cooperate with GSS, while people living in an area with more minors under 18 is more likely to cooperate with both Census and the GSS. By using two data sources with contrasting survey dimensions within the United States, our findings have implications for survey field operations and hopefully will invigorate studies about response rates in a Korean context.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2008.11a
• /
• pp.45-46
• /
• 2008

• Explosives and Blasting
• /
• v.9 no.3
• /
• pp.3-9
• /
• 1991

On Influence of ground Vibration occured when smoky-chimney is demolished. The Shock Energy by falling down of smoky-ehimney(60m height ) demolition spread mainly to the breaking reinforced concrete and to ground Vibration.

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2009.11a
• /
• pp.79-80
• /
• 2009