• 한국지하수토양환경학회지:지하수토양환경
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• 제22권6호
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• pp.104-111
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• 2017

As carcass disposal is increasing widely in Republic of Korea, there is a need to comprehensively analyze the impacts and subsequent damages of carcass disposal. Especially, since environmental policy aims to not only reduce environmental damages, but also enhance overall sustainability, we apply the concept of environmental welfare to assess the comprehensive impact of carcass disposal, especially focusing on the rural area. In specific, assessment criteria were suggested based on the four categories related to environmental welfare, which were 'environmental quality', 'level of environmental service', 'environmental safety', and 'participation, openness to public, and communication'. The results showed negative impacts of carcass disposal in environmental, social and economical elements. Overall decrease in environmental quality negatively impacts the other elements of environmental welfare. Furthermore, there were discrepancies of level of impacts and damages among stakeholder. In the end, we suggest critical elements that need to be applied in relevant policies and regulation to promote effective carcass disposal management.

• Nuclear Engineering and Technology
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• 제54권8호
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• pp.2828-2839
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• 2022

This study developed a safety assessment tool for geological disposal systems called APro, a systemically integrated modeling system based on modularizing and coupling the processes which need to be considered in a geological disposal system. Thermal, hydraulic, chemical, canister failure, radionuclide release and transport processes were considered in the current version of APro. Each of the unit processes in APro consists of a single Default Module, and several Alternative Modules which can increase the flexibility of the model. As an initial stage of developing the modularization concept and modeling interface, the Default Modules of each unit process were described, with one Alternative Module of chemical process. The computation part of APro is mainly a MATLAB workspace controlling COMSOL and PHREEQC, which are coupled by an operator splitting scheme. The APro model domain is a stylized geological disposal system employing the Swedish disposal concept (KBS-3 type), but the repository layout can be freely adjusted. In order to show the applicability of APro to the total system performance assessment of geological disposal system, some sample simulations were conducted. From the results, it was confirmed that coupling of the thermal and hydraulic processes and coupling of the canister failure and the radionuclide release processes were well reflected in APro. In addition, the technical connectivity between COMSOL and PHREEQC was also confirmed.

• 방사성폐기물학회지
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• 제20권4호
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• pp.501-510
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• 2022

The nuclear criticality analyses considering burnup credit were performed for a spent nuclear fuel (SNF) disposal cell consisting of bentonite buffer and two different types of SNF disposal canister: the KBS-3 canister and small standardized transportation, aging and disposal (STAD) canister. Firstly, the KBS-3 & STAD canister containing four SNFs of the initial enrichment of 4.0wt% ²³⁵U and discharge burnup of 45,000 MWD/MTU were modelled. The k_eff values for the cooling times of 40, 50, and 60 years of SNFs were calculated to be 0.79108, 0.78803, and 0.78484 & 0.76149, 0.75683, and 0.75444, respectively. Secondly, the KBS-3 & STAD canister with four SNFs of 4.5wt% and 55,000 MWD/MTU were modelled. The k_eff values for the cooling times of 40, 50, and 60 years were 0.78067, 0.77581, and 0.77335 & 0.75024, 0.74647, and 0.74420, respectively. Therefore, all cases met the performance criterion with respect to the k_eff value, 0.95. The STAD canister had the lower k_eff values than KBS-3. The neutron absorber plates in the STAD canister significantly affected the reduction in k_eff values although the distance among the SNFs in the STAD canister was considerably shorter than that in the KBS-3 canister.

• 방사성폐기물학회지
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• 제20권4호
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• pp.511-521
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• 2022

Decommissioning of nuclear power plants generates a large amount of radioactive waste in a short period. Moreover, Radioactive waste has various forms including a large volumes of metal, concrete, and solid waste. The disposal of decommissioning waste using 200 L drums is inefficient in terms of economics, work efficiency, and radiation safety. Therefore, The Korea Radioactive Waste Agency is developing large containers for the packaging, transportation, and disposal of decommissioning waste. Assessing disposability considering the characteristics of the radioactive waste and facility, convenience of operation, and safety of workers is necessary. In this study, the exposure dose rate of workers during the disposal of new containers was evaluated using Monte Carlo N-Particle Transport code. Six normal and four abnormal scenarios were derived for the assessment of the dose rate in a near surface disposal facility operation. The results showed that the calculated dose rates in all normal scenarios were lower than the direct exposure dose limitation of workers in the safety analysis report. In abnormal scenarios, the work hours with dose rates below 20 mSv·y^-1 were calculated. The results of this study will be useful in establishing the optimal radiation work conditions.

• 방사성폐기물학회지
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• 제4권4호
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• pp.393-400
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• 2006

고준위폐기물 심지층 처분장 설계시 주요한 고려인자는 완충재의 건전성 유지를 위하여 폐기물로부터 발생되는 열로 인하여 완충재의 온도가 $100^{\circ}C$를 넘지 않도록 하는 것이다. 본 연구에서는 이러한 요건을 만족하는 고준위폐기물 심지층 처분장 배치를 위하여 처분터널 및 처분공 간격에 대한 분석을 수행하였다. 이를 위하여, 기준 처분개념을 바탕으로 사용후핵연료의 냉각기간 및 처분터널/처분공 간격을 다양하게 설정하여, 처분시스템에서의 열적 안정성 해석 및 결과를 비교분석하였다. 분석결과, 처분장 열적 요건을 만족하는 배치는 처분터널의 간격 보다는 처분공 간격을 조절하여 배치하는 것이 유리한 것으로 판단되었다. 본 연구의 결과는 심지층 처분시설 설계시 활용될 것이다. 향후, 정확한 부지특성 자료를 통한 상세한 분석이 수행되면, 분석결과의 불확실성을 줄일 것이다.

• 방사성폐기물학회지
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• 제15권3호
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• pp.257-264
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• 2017

중저준위 방사성폐기물의 처분안전성 확보와 중저준위 방폐물관리 시행계획에 따른 안정적인 처분시설 개발을 위해 중준위 방사성폐기물 처분농도제한치에 대하여 IAEA 방법론에 따라 고찰하였다. 고찰결과 IAEA 방법론에 따라 도출된 결과는 1단계 동굴처분시설 중준위 방사성폐기물의 처분농도제한치로 사용하기 부적합하였다. 1단계 동굴처분시설은 다양한 준위 및 여러 종류의 방사성폐기물이 처분 대상이 되나, IAEA 방법론은 본래 천층처분시설의 처분농도제한치를 설정하는 방법으로서, 단일종류의 방사성폐기물로만 구성된 처분시설의 처분농도제한치를 설정하기 적합하기 때문이었다. 따라서 처분대상 방사성폐기물의 준위별 수량을 고려한 방사능 도출, 이에 대한 시나리오별 평가결과 및 성능목표치를 고려한 1단계 동굴처분시설 중준위 방사성폐기물 처분농도제한치 산출 방법의 개발 및 적용이 동굴처분시설의 안정적인 운영을 위해 필요하다.

• 대한토목학회논문집
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• 제26권3D호
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• pp.491-497
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• 2006

본 연구에서는 주민기피시설인 하수처리장 주변에 거주하는 주민들을 대상으로 설문을 통해 하수처리장에 대한 일반인식과 설치 후 환경변화에 대해서 어떻게 생각하고 있는지를 알아보고 지역별로 어떤 차이가 있는지를 다루고자 하였다. 또한 하수처리시설 입지에 영향을 미치는 요인을 실증 분석하고자 했다. 이러한 실증분석을 위해 다변량 분산분석과 다중회귀분석을 이용했으며 그 결과를 요약하면 다음과 같다. 전체적으로 하수처리시설은 사회적으로 필요한 시설이며 적절한 보상이 이루어진다면 긍정적으로 고려할 수 있는 시설이라는 의견이 높게 나타났다. 그러나 하수처리시설의 시행과정에 대한 평가는 전체적으로 만족스럽지 못하게 나타났다. 다음으로 하수처리장의 입지와 관련된 결과에서 하수처리장이 자신의 주거지 근처에 입지함에 따른 환경변화에 대한 인식은 지역별로 유의한 차이를 나타내지 않았지만, 그러한 인식에 영향을 끼치는 요인은 지역별로 다소 다르다는 것을 알 수 있었다. 이러한 사실은 앞으로 하수처리장뿐만 아니라 주민들이 기피하는 시설을 건설하고자 하는 경우에 어떤 절대적인 기준이 있는 것이 아니라 오히려 대상지역의 여건과 주민의 반향을 파악하여 그에 맞는 대책이 필요하다는 것을 의미한다.

• 가정과삶의질연구
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• 제15권1호
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• pp.27-40
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• 1997

This article focuses on the environmentally responsible consume disposal behavior and the effects of socio-demographic variables and the ecologically concerned. consumer attitudes on it. Data was collected from 458 housewives who live in Ulsan city. The results indicated as follows. First the ecologically concerned. Second the environmentally responsible consumer disposal behavior of household durables and semi-durables differs significantly according to wife's religion and occupation. Third the ecologically concerned consumer attitudes was positively correlated with the environmentally responsible consumer disposal behavior. Fourth as the ecologically concerned consumer attitudes was controlled the effects of wife's religion was disappeared.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.257-258
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• 2005

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.261-262
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• 2005