• Nuclear Engineering and Technology
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• 제41권5호
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• pp.617-648
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• 2009

Under the government supported long-term nuclear R&D program, the severe accident research program at KAERI is directed to investigate unresolved severe accident issues such as core debris coolability, steam explosions, and hydrogen combustion both experimentally and numerically. Extensive studies have been performed to evaluate the in-vessel retention of core debris through external reactor vessel cooling concept for APR1400 as a severe accident management strategy. Additionally, an improvement of the insulator design outside the vessel was investigated. To address steam explosions, a series of experiments using a prototypic material was performed in the TROI facility. Major parameters such as material composition and void fraction as well as the relevant physics affecting the energetics of steam explosions were investigated. For hydrogen control in Korean nuclear power plants, evaluation of the hydrogen concentration and the possibility of deflagration-to-detonation transition occurrence in the containment using three-dimensional analysis code, GASFLOW, were performed. Finally, the integrated severe accident analysis code, MIDAS, has been developed for domestication based on MELCOR. The data transfer scheme using pointers was restructured with the modules and the derived-type direct variables using FORTRAN90. New models were implemented to extend the capability of MIDAS.

• Child Health Nursing Research
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• 제9권2호
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• pp.162-172
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• 2003

Purpose: The purpose of this study is to develop safety education program to prevent child accident and to improve the health of children by providing a safe environment. This program provide parents and children with information on how to prevent children from accident. Children especially can learn specific methods to avoid accident both at home, school and outside the home through safety education, which is based on problem solving. Method: This program was developed based on literature reviews, surveys and negotiation process. School aged children, parents, and teachers were interviewed to identify their educational needs based on their experiences related to child accident. During the 7th Annual Conference of Educational Courses in 1999, the Korean Educational Ministry examined the feasibility and compatibility of integrating the program into the current educational curriculum. Result: This program includes useful subjects such as safety education, preventive strategies, crisis management, guide for parent and teacher, resource persons, internet site and phone numbers of available hospital. Counseling is provided by researcher if needed. Conclusion: This program could be adequately utilized for prevention of child accident and creation of preventive strategies. It will also suggest an intervention strategy for injured children.

• 한국콘텐츠학회논문지
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• 제9권5호
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• pp.249-256
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• 2009

본 연구는 2007년 12원 7일 태안지역에서 갑자기 발생한 허베이 스피리트호 기름유출사고로 인한 재난 지역의 공동체 파괴와 재난취약성에 대한 극복 방안으로서의 재난에 강한 지역공동체 형성 전략 방안을 제시하는데 연구목적이 있다. 이러한 연구목적을 달성하기 위하여 본 연구에서는 지역맥락 접근, 거버넌스 전략, 지역사회 중심 접근 측면에서의 문제점을 도출하고 이를 바탕으로 재난에 강한 지역공동체 형성 전략 방안을 제시하였다. 분석결과 첫째, 스피리트호 기름유출사고 시 재난지역에 대한 지역연구의 부족과 지역안전관리계획의 비현실성 등이 문제점으로 지적되었고, 이를 극복하기 위하여 향후 지역연구의 활성화와 지역안전관리계획의 상향식 접근의 필요성 등을 제시하였다. 둘째, 자원봉사의 활성화가 이루어지는 계기가 마련되었지만, 여전히 거버넌스에 기반 한 효율적 재난관리의 문제점이 있었고 이를 극복하기 위한 방안으로 정부-기업-민간 부문의 상호 협력과 협조를 핵심으로 하는 네트워크 거버넌스를 구축하여 야 할 것이다. 셋째, 지역사회 중심의 재난에 강한 공동체를 형성하는데 있어서 사회적 네트워크와 사회적 관계를 의미하는 사회적 자본의 형성이 무엇보다 중요하다.

• 한국물환경학회지
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• 제23권1호
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• pp.103-110
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• 2007

An efficient operational strategy using expert system for metro water supply systems in case of emergency situations is developed in this study. The emergency situations of the water supply systems are classified into three categories : pipeline system accident, machinery and electric facility accident and water quality accident. A PC-based expert system is developed using CLIPS for Seoul metro water supply system, Phase 1 & 2 system and Phase 3 & 4 system. Broad professional knowledges and experiences from the experts in the water supply systems have been collected systematically to construct the knowledge base. Decision-making in case of an emergency is based upon the professional knowledge so that a rational and efficient operational management can be available even in the absence of experienced expert. Especially the expert model developed in this study also provides a guide for pumping operation in case of pipeline accident to confirm that the proper pressure to all nodes in the system is supplied. The pipe network simulator KYPIPE has been consecutively executed by trial and error fashion for each pipeline in the system. The results from KYPIPE were included in the knowledge base to supplement the knowledge of the field engineers.

• 한국압력기기공학회 논문집
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• 제17권2호
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• pp.90-100
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• 2021

Molten corium-concrete interaction (MCCI) is one of the most important phenomena that can lead to the potential hazard of late containment failure due to basemat penetration during a severe accident. In this study, MCCI analytical models of the CORQUENCH code were prepared through verification calculations of several experiments, which had been performed using concrete types similar to those of the calandria vault floor in CANDU-6 plants. The behaviors of thermal-hydraulic variables related to MCCI phenomena were analyzed under the conditions of dry floor and water flooding during the severe accident stemming from a hypothetic station blackout. Uncertainty analyses on the ablation depth were also carried out. It was estimated that the concrete ablation was not interrupted due to the continuous MCCI process under the dry condition but was terminated within 24 hours under the water flooding condition. It was confirmed that the water flooding as a mitigating action was effective to achieve the quenching and thermal stabilization of the melt discharged from the calandria vessel, showing that the present models are capable of reasonably simulating MCCI phenomena in CANDU-6 plants. This study is expected to provide the technical bases to the accident management strategy during the late-phase severe accidents.

• Nuclear Engineering and Technology
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• 제54권1호
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• pp.152-161
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• 2022

We analyzed mitigation strategies for steam generator tube rupture (SGTR) accidents using MARS code under both full-power and low-power and shutdown (LPSD) conditions. In general, there are two approaches to mitigating SGTR accidents: supplementing the reactor coolant inventory using safety injection systems and depressurizing the reactor coolant system (RCS) by cooling it down using the intact steam generator. These mitigation strategies were compared from the viewpoint of break flow from the ruptured steam generator tube, the core integrity, and the possibility of the main steam safety valves opening, which is associated with the potential release of radiation. The "cooldown strategy" is recommended for break flow control, whereas the "RCS make-up strategy" is better for RCS inventory control. Under full power, neither mitigation strategy made a significant difference except for on the break flow while, in LPSD modes, the RCS cooldown strategy resulted in lower break and discharge flows, and thus less radiation release. As a result, using the cooldown strategy for an SGTR under LPSD conditions is recommended. These results can be used as a fundamental guide for mitigation strategies for SGTR accidents according to the operational mode.

• 대한안전경영과학회지
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• 제15권1호
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• pp.169-176
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• 2013

A government needs the investment expansion for the industrial accident prevention of the disadvantage group workers in order to improve the external phase and reliability. In this study, we analyze the current status of the development for safety and health material which is necessary for education of the disadvantage group workers. Firstly we find the problems that may occur when applying in domestic safety and health management system and then we'll propose a new method for safety and health material development and supply.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 춘계학술발표회논문집(1)
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• pp.473-478
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• 1997

A severe accident management strategy, in-vessel retention corium through external reactor vessel cooling(ERVC) is being studied worldwide as a means to prevent reactor vessel failure following a core melt accident. An evaluation of feasibility of this ERVC for a large Advanced Light Water Reactor (ALWR) is presented. To account for the coolability of corium and metal in the reactor vessel, a thermal analysis is performed using an existing method. Results show that the peak heat flux along the inner surface of the reactor vessel lower head has a relatively smaller margin than a small capacity reactor such as AP600 in regards with the critical heat flux attainable at the outer surface of the reactor vessel lower head.

• International Journal of Reliability and Applications
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• 제3권2호
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• pp.61-80
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• 2002

Tree-harvesting worker data of 508 separate worker accidents are analyzed and an exploratory approach taken. The worker accident data cover a sample of five years. The scope of the study was the southeastern United States of America. As might be hypothesized, the chainsaw was the most hazardous type of tree-harvesting equipment. It accounted for 55％ of the tree-harvesting accidents. Most chainsaw accidents resulted in injuries to the lower extremities and were more frequent among younger employees. The probability of one or more chainsaw accidents occurring in any 30-day period was approximately 0.856. Chainsaw accidents were more likely to occur in late morning and early afternoon. We used statistical tools such as Pareto charts, c-charts and Ishikawa diagrams. Such tools are useful in diagnosing the root-cause of tree-harvesting worker accidents and help in developing preventive safety programs. Recommendations to help improve the quality of information of accident data collected by insurance companies and others are briefly given. The strategy and culture of continuous process improvements are stressed.

• 한국건설관리학회논문집
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• 제1권2호
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• pp.81-88
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• 2000

건설회사 본사차원의 안전관리 활동은 회사 전체의 안전관리업무 기획 및 조정 등을 하는 업무로서 건설회사의 안전수준을 향상시키는 데 있어 매우 중요한 요소 중의 하나이다. 이에 본 연구는 건설회사의 안전수준에 따라 합리적이고 효과적인 본사 안전관리 업무가 가능한 안전전략을 제안하는 목적으로 수행되었다. 국내 대형 건설회사 본사의 안전관리업무 실태를 파악하기 위하여 초일류기 업 인증제도의 안전부문 평가항목 및 기준 중 본사 차원에 해당되는 것을 안전관련 전문가를 통해 이의 유효성을 검증하도록 하였다. 이러한 과정을 통하여 채택된 평가항목 및 기준을 조사대상인 79개 건설회사에 대하여 설문조사를 실시하였다. 수집된 51개 건설회사의 설문조사 결과를 바탕으로 현재의 건설회사 안전수준에서 안전성과를 향상시킬 수 있는 안전전략을 79개 건설회사의 3년간 평균 재해율인 1.20을 기준으로 평균 재해율 이하와 이상인 건설회사 집단으로 구분하여 제안하였다.