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The Status and Prospect of Decommissioning Technology Development at KAERI
Jeikwon Moon,Seonbyung Kim,Wangkyu Choi,Byungseon Choi,Dongyong Chung,Bumkyoung Seo 한국방사성폐기물학회 2019 방사성폐기물학회지 Vol.17 No.2
한국원자력연구원에서 개발 중인 해체기술 현황 및 전망에 대해 기술하였다. 특히, 해체의 핵심기술인 제염, 원격절단, 해체 폐기물처리 및 부지 복원 분야를 중점적으로 다루었다. 제염기술로는 부품제염과 원자력시스템제염 부분을 고찰하였고, 원격절단기술 관련해서는 절단기술, 원격제어 및 해체공정 모사기술이 다루어졌다. 해체 폐기물처리기술 관련해서는, 비록 해체 후 다양한 폐기물이 발생하지만, 주 폐기물인 금속, 가연성폐기물과 난처리성 특수 폐기물인 고염 고방사성 폐액, 유기혼 성폐기물 및 우라늄 복합폐기물 처리기술 등을 주로 기술하였다. 마지막으로, 해체부지 복원 분야에서는 방사선 측정, 부지 재이용의 안전성평가 그리고 부지 복원기술 등을 중점적으로 기술하였다. The current status and prospect of decommissioning technology development at KAERI are reviewed here. Specifically, this review focuses on four key technologies: decontamination, remote dismantling, decommissioning waste treatments, and site remediation. The decontamination technologies described are component decontamination and system decontamination. A cutting method and a remote handling method together with a decommissioning simulation are described as remote dismantling technologies. Although there are various types of radioactive waste generated by decommissioning activities, this review focuses on the major types of waste, such as metal waste, concrete waste, and soil waste together with certain special types, such as high-level and high-salt liquid waste, organic mixed waste, and uranium complex waste, which are known to be difficult to treat. Finally, in a site remediation technology review, a measurement and safety evaluation related to site reuse and a site remediation technique are described.
Decontamination of radioactive soil wastes using an agglomeration-leaching process
Jeikwon Moon,Jung-Joon Lee,김계남,Kune-Woo Lee 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
An agglomeration-leaching process was evaluated to decontaminate Co-60 and Cs-137 from radioactive soils. Radioactive soils were screened based on the particle size of 0.075 mm. The soils with particle size of less than 0.075 mm were agglomerated by using a 2 wt% Na2SiO3 which had been predetermined to be an optimum reagent for an agglomeration. The agglomerated soils were mixed with the other soils with particle size bigger than 0.075 mm for leaching tests. Several leaching solutions were evaluated for their leaching performances for Co-60 and Cs-137from simulated soil wastes, and the 0.1 M HCl solution was shown to be the most effective one. Leaching tests for radioactive soils in a column showed that the radioactive soils contaminated with Co-60 and Cs-137 radionuclides could be decontaminated down to the potential release criteria (~100 Bq/kg) by using the appropriate conditions of an agglomeration-leaching process.
VSM 에 의한 단일기체 흡착등온선으로부터 혼합기체 흡착평형 예측
김재우,문제권,이한주 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.3
본 연구는 VSM 이론을 이용하여 단일기체 흡착등온선으로부터 혼합기체 흡착데이타를 예측하고자 한것이다. 제올라이트 5A 흡착제에 propane과 butane으로 등온 흡착실험을 하였으며 VSM에 의한 단일기체 흡착등온식에 있는 매개변수들(n₁^(s,∞), b₁, Λ_(13), Λ_(31))을 실험데이타에 의해서 비선형 회귀법과 최적화방법으로 구하였으며 이 매개변수들을 이용하여 시행착오법으로 혼합기체의 데이타를 예측하였다. 두 흡착질의 조성을 달리 하면서 혼합물 흡착실험을 하였으며 실험데이타는 VSM이론에 잘 부합하였다. This study is to predict adsorption equilibrium data for binary gas mixture systems using the vacancy solution model (VSM). The single component adsorption isotherms of propane and n-butane on a 5A molecular sieves (Davison C-625) were determined experimentally and from these isotherms the parameters in a single component adsorption isotherm equation by the vacancy solution model (n₁^(s,∞), b₁, Λ_(13), Λ_(31)) were calculated. A nonlinear regression method and an optimization method were employed in the calculation of the parameters. The parameters were then used in the prediction of the binary gas mixture adsorption equilibrium curve through a trial-and-error method. The experimental mixed-gas adsorption data for varying composition of propane-n-butane mixture were in good agreement with the predicted equilibrium curve based on the VSM.
Jeong, KwanSeong,Choi, ByungSeon,Moon, JeiKwon,Hyun, Dongjun,Lee, Jonghwan,Kim, IkJune,Kim, GeunHo,Kang, ShinYoung,Choi, JongWon,Jeong, SeongYoung,Ahn, SangMyeon,Lee, JungJun Elsevier 2016 Annals of nuclear energy Vol.94 No.-
<P><B>Abstract</B></P> <P>This paper is intended to suggest an approach to an estimation of the work time to optimize the trajectories of workers during decommissioning of nuclear facilities. The working times during decommissioning for nuclear facilities have a great effect on safety and costs. The key feature of this work is to analyze and to evaluate the working times in virtual decommissioning environments. The measured data are statistically analyzed into the mean and variance work time and radiation exposure dose. It is expected that the safety of decommissioning will be improved and decommissioning costs can be reduced. It can be concluded that this work will make it possible to efficiently establish the ALARA plan for decommissioning of nuclear facilities.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Estimation on work time to optimize the trajectories of workers. </LI> <LI> The scenario-based system in virtual decommissioning environments. </LI> <LI> Statistical analysis and evaluation of work time and radiation exposure dose. </LI> </UL> </P>