Effect analysis of ISLOCA pathways on fission product release at Westinghouse 2-loop PWR using MELCOR
| Autor: | Youngho Jin, Moosung Jae, Seungwoo Kim, Yerim Park, Dong Ha Kim |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nuclear fission product
Effect analysis 020209 energy Nuclear engineering TK9001-9401 02 engineering and technology ISLOCA Westinghouse 2-loop PWR 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Nuclear Energy and Engineering Accident management MELCOR Source term Heat exchanger 0202 electrical engineering electronic engineering information engineering Environmental science Nuclear engineering. Atomic power Release pathway Severe accident |
| Zdroj: | Nuclear Engineering and Technology, Vol 53, Iss 9, Pp 2878-2887 (2021) |
| ISSN: | 1738-5733 |
| Popis: | As the amount of fission product released from ISLOCA was overestimated because of conservative assumptions in the past, several studies have been recently conducted to evaluate the actual release amount. Among several pathways for the ISLOCA, most studies were focused on the pathway with the highest possibility. However, different ISLOCA pathways may have different fission product release characteristics. In this study, fission product behavior was analyzed for various pathways at the Westinghouse two-loop plant using MELCOR. Four pathways are considered: the pipes from a cold leg, from a downcomer, from a hot leg to the outlet of RHR heat exchanger, and the pipe from the hot leg to the inlet of RHR pump (Pathway 1–4). According to the analysis results, cladding fails at around 2.5 h in Pathways 1 and 2, and on the other hand, about 3.3 h in Pathways 3 and 4 because the ISLOCA pathways affect the safety injection flow path. While the release amount of cesium and iodine ranges between 20 and 26% in Pathways 1 to 3, Pathway 4 allows only 5% to the environment because the break location is submerged. Also, as more than 90% of cesium released to the environment passes through the personnel door, reinforcing the pressure capacity of the doors would be a significant factor in the accident management of the ISLOCA. |
| Databáze: | OpenAIRE |
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