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MELCOR 코드를 이용한 원자력발전소 중대사고 방사선원항 평가 방법
한석중 ( Seok Jung Han ),김태운 ( Tae Woon Kim ),안광일 ( Kwang Li Ahn ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 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 radio-logical source term, it has been hardly utilized for the radiological consequence analysis mainly due to a lack of un-derstanding 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 pro-cedure: (1) selection of plant condition leading to a severe accident(i.e, accident sequence), (2) analysis of the rele-vant severe accident code, (3)investigation of the code analysis results and post-processing, and (4) generation of radio-logical 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; and (3) the generation of source term infor-mation for the consequence analysis relies on an expert opinion in both areas of severe accident analysis and conse- quence 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.
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.
자바리, Epinephelus bruneus의 난 발생과 부화에 미치는 수온의 영향
양문호,최영웅,정민민,구학동,오봉세,문태석,이창훈,김경민,한석중,Yang, Moon-Ho,Choi, Young-Ung,Jung, Min-Min,Ku, Hag-Dong,Oh, Bong-Sae,Moon, Tae-Seok,Lee, Chang-Hoon,Kim, Kyong-Min,Han, Seock-Jung 한국발생생물학회 2007 발생과 생식 Vol.11 No.2
This study examined temperature effect in egg development and hatching of longtooth grouper, Epinephelus bruneus. Fertilized embryos was not growth after morula stage at $15^{\circ}C$, at 18, 21, 24 and $27^{\circ}C$, the required time from fertilized embryos to hatching were 70 h. 30 min., 44 h. 10 min., 29 h. 10 min. and 24 h. 30 min., respectively. The hatching rates at $24^{\circ}C$ were higher than the other conditions and the hatching was not occurred at $15^{\circ}C$. These results suggest that the water temperature range of egg development and hatching was $18{\sim}27^{\circ}C$. 이 연구는 실내 사육수조에서 자연산란 후 수정된 난을 대상으로 수온에 따른 난 발생속도와 부화율을 조사하였다. 부화에 이르기까지 각 수온조건에서 소요된 시간은 $15^{\circ}C$에서 상실기 이후 발생이 진행되지 않았고, 18, 21, 24, $27^{\circ}C$에서 각각 70시간 30분, 44시간 10분, 29시간 10분 그리고 24시간 30분이 소요되었다. 부화율은 $15^{\circ}C$에서 0%였고, 18, 21, 24 그리고 $27^{\circ}C$에서 각각 $8.3{\pm}1.2%$, $18.0{\pm}6.2%$, $24.0{\pm}4.0%$ 그리고 $17.0{\pm}7.2%$로 뚜렷한 차이 없이 $24^{\circ}C$에서 다소 높았고 21와 $27^{\circ}C$에서 비슷한 경향이었으며 $18^{\circ}C$에서 가장 낮게 나타났다. 이러한 결과에서 자바리의 난발생 수온범위는 $18{\sim}27^{\circ}C$로 제안된다.