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원자력시스템에서 순차적 다중실패상태의신뢰도 평가 방법에 관한 고찰
한석중 한국안전학회 2011 한국안전학회지 Vol.26 No.4
A study on reliability estimation of sequential-ordered multiple failure modes, which are sequentially ordered between failure modes in a considering system, was performed. Especially, an approach to estimate the probabilities of failure modes has been proposed under an assumption that failure modes are mutually exclusive and sequentially ordered by only a critical variable. A feasibility of the proposed approach were studied by a practical example, which is a reliability estimation of passive safety systems for a probabilistic safety assessment(PSA) of a very high temperature reactor(VHTR) that is under development as a future nuclear system with enhanced safety features. It is difficult to define a robust failure state of this nuclear system because of its enhanced radiation release characteristics, so the new approach is a useful concept to estimate not only its safety but also a PSA. A feasibility study applied two failure modes(e.g., small and large release of radioactive materials) with considering the integrated behavior of this nuclear system. It is expected that the multiple release states for a practical estimation can be easily extended to the aforementioned example. It was found out that the proposed approach was a useful technique to cover the unfavorable features of this nuclear system as to performing a VHTR PSA.
시볼트전복, Hallotis sieboldii 의 생물학적 영도와 사육수온에 따른 난 발생
한석중,김철원,Han, S.J.,Kim, C.W. 국립한국농수산대학교 교육개발센터 2011 현장농업연구지 = Journal of practical agricultural resear Vol.13 No.1
For the establishment of seed production technique of warm water abalone species Haliotis sieboldii, development of the fertilized eggs and its biological minimum temperature were determined. The durations of each development stages at the six rearing temperature regimes were expressed as an exponential equation: 4 celled stage 1/h = 0.1346T - 2.1709(r<sup>2</sup> = 0.88) Morula stage 1/h = 0.0176T - 0.2184 (r<sup>2</sup> = 0.89) Trochophore 1/h = 0.0063T - 0.0512 (r<sup>2</sup> = 0.98) Veliger 1/h = 0.0045T - 0.0295 (r<sup>2</sup> = 0.99) 2nd c.t. 1/h = 0.0008T - 0.0047 (r<sup>2</sup> = 0.99) According to the equation, the biological minimum temperature for Haliotis sieboldii was estimated to be 9.7 ℃.
MELCOR 코드를 이용한 원자력발전소 중대사고 방사선원항 평가 방법
한석중,김태운,안광일 한국안전학회 2012 한국안전학회지 Vol.26 No.6
For a severe accident of nuclear power plant, an approach to estimation of the radiological source term using a severe accident code(MELCOR) has been proposed. Although the MELCOR code has a capability to estimate the radiological source term, it has been hardly utilized for the radiological consequence analysis mainly due to a lack of understanding on the relevant function employed in MELCOR and severe accident phenomena. In order to estimate the severe accident source term to be linked with the radiological consequence analysis, this study proposes 4-step procedure:(1) selection of plant condition leading to a severe accident(i.e., accident sequence), (2) analysis of the relevant severe accident code, (3) investigation of the code analysis results and post-processing, and (4) generation of radiological source term information for the consequence analysis. The feasibility study of the present approach to an early containment failure sequence caused by a fast station blackout(SBO) of a reference plant (OPR-1000), showed that while the MELCOR code has an integrated capability for severe accident and source term analysis, it has a large degree of uncertainty in quantifying the radiological source term. Key insights obtained from the present study were: (1) key parameters employed in a typical code for the consequence analysis(i.e., MACCS) could be generated by MELCOR code;(2) the MELOCR code simulation for an assessment of the selected accident sequence has a large degree of uncertainty in determining the accident scenario and severe accident phenomena; and (3) the generation of source term information for the consequence analysis relies on an expert opinion in both areas of severe accident analysis and consequence analysis. Nevertheless, the MELCOR code had a great advantage in estimating the radiological source term such as reflection of the current state of art in the area of severe accident and radiological source term
고등어(Scomber japonicus ) 치어의 마취제로서 Clove oil, MS-222 및 2-Phenoxyethanol의 평가
한석중,김경민,최낙중,구준호,박충국,이원교,지승철 한국수산과학회 2011 한국수산과학회지 Vol.44 No.6
The efficiency of clove oil, MS-222, and 2-phenoxyethanol was evaluated as anesthetics in juvenile Scomber japonicus . Stage A5 of anesthesia was assumed to be sufficient for conducting routine aquaculture procedures in less than 3 min, with recovery (stage R5) in less than 5 min. The lowest effective doses of the three anesthetics were 50mg L^(-1) clove oil (anesthetic time of 71.3 s and recovery time of 167.0 s), 100 mg L^(-1) MS-222 (anesthetic time of 70.7 s and recovery time of 115.7 s), and 400 mg L^(-1) 2-phenoxyethanol (anesthetic time of 86.7 s and recovery time of 95.0 s). Anesthetic times decreased with increasing doses for all three anesthetic agents, and fish anesthetized with clove oil exhibited the longest recovery times. After 30 min, the highest plasma cortisol and lactate levels were detected with the use of clove oil, whereas the lowest values were observed with 2-phenoxyethanol. In addition, high glucose levels were maintained during recovery with clove oil, but the treatments did not significantly differ. The most effective of the three anesthetic agents was 2-phenoxyethanol, although all were considered acceptable for use in cultures of juvenile Scomber japonicus
원자력발전소 중대사고시 소외결말분석상에 방사선원항 특성의 영향
한석중 ( Seok Jung Han ),안광일 ( Kwang Ll Ahn ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.7
The effects of the radiological source term characteristics on an off-site consequence analysis owing to severe accident of a unclear power plants have been examined. The typical source tem features, i.e., (1) plume characteristics of release time and duration, (2) aerosol size, and (3) sensible heat, were derived from the MELCOR code as a severe accident code. Their effects on off-site consequence were examined according to a sensitivity analysis approach for each parameter. The results showed that the release time and duration had a considerable effect on a consequence, but the aerosol size and the sensible heat had a limited effect. Based on the obtained insights, it is recommended that it is necessary to apply the source term features to consequence analysis. A further study is recommended to utilize this key finding for a precise estimation of the source term.