Sensitivity studies of air ingress accidents in modular HTGRs
| Autor: | Sydney J. Ball, Sergey Shepelev, Matt Richards |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Nuclear and High Energy Physics
Engineering Pebble-bed reactor Waste management business.industry Mechanical Engineering Nuclear engineering Flow (psychology) Modular design Nuclear reactor law.invention Core (optical fiber) Nuclear Energy and Engineering Nuclear reactor core law General Materials Science Sensitivity (control systems) Safety Risk Reliability and Quality business Waste Management and Disposal Reactor pressure vessel |
| Zdroj: | Nuclear Engineering and Design. 238:2935-2942 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2008.02.021 |
| Popis: | Postulated air ingress accidents, while of very low probability in a modular high-temperature gas-cooled reactor (HTGR), are of considerable interest to the plant designer, operator, and regulator because of the possibility that the core could sustain significant damage under some circumstances. Sensitivity analyses are described that cover a wide spectrum of conditions affecting outcomes of the postulated accident sequences, for both prismatic and pebble-bed core designs. The major factors affecting potential core damage are the size and location of primary system leaks, flow path resistances, the core temperature distribution, and the long-term availability of oxygen in the incoming gas from a confinement building. Typically, all the incoming oxygen entering the core area is consumed within the reactor vessel, so it is more a matter of where, not whether, oxidation occurs. An air ingress model with example scenarios and means for mitigating damage are described. Representative designs of modular HTGRs included here are a 400-MW(th) pebble-bed reactor (PBR), and a 600-MW(th) prismatic-core modular reactor (PMR) design such as the gas-turbine modular helium reactor (GT-MHR). |
| Databáze: | OpenAIRE |
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