Efficacy assessment of independent severe accident mitigation measures in OPR1000 using MELCOR code
- Title
- Efficacy assessment of independent severe accident mitigation measures in OPR1000 using MELCOR code
- Author
- 김성중
- Keywords
- Severe accident; OPR1000; accident management; MELCOR; effectiveness and adverse effects; hydrogen risk; Shapiro diagram
- Issue Date
- 2017-01
- Publisher
- TAYLOR & FRANCIS LTD
- Citation
- JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY, v. 54, no. 1, page. 89-100
- Abstract
- In-vessel and ex-vessel mitigation strategies have been revisited to improve the severe accident management (SAM) for operating nuclear power plants. Because independent mitigation measures tend to produce positive and adverse effects simultaneously, it is necessary to investigate the efficacy of individual measures by means of proper quantification. Thus, in the present study we investigated the overall efficacy of existing SA mitigation strategies prepared for the Optimized Power Reactor 1000MWe (OPR1000) by means of MELCOR 1.8.6 code. The numerical evaluation showed that the Mitigation-01, feeding water into the steam generators, is the most effective among the other mitigations. In addition, Mitigation-02, reactor coolant system depressurization, could not mitigate the SA sufficiently when applied individually. Among the four ex-vessel mitigation strategies, execution of containment spray was effective in removing most of the aerosol fission product but also intensified hydrogen combustion by increasing the partial hydrogen pressure owing to steam condensation. Mitigation-07, operation of passive autocatalytic recombiners (PARs), could reduce the hydrogen concentration, though the catalytic reaction was predicted to increase the containment pressure. In conclusion, this study suggests that mitigation measures should be carefully selected, and that counteracting measures should be prepared to minimize potential adverse effects.
- URI
- https://www.tandfonline.com/doi/full/10.1080/00223131.2016.1213670https://repository.hanyang.ac.kr/handle/20.500.11754/112454
- ISSN
- 0022-3131; 1881-1248
- DOI
- 10.1080/00223131.2016.1213670
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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