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Fire Probabilistic Safety Assessment (Fire-PSA)Level 1 in Auxiliary Building ofIR-360 Nuclear Power Plant

Hassanian, Amir | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42164 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani , Mohammad Bagher; Yousefpour, Faramarz; Karimi, Kaveh
  7. Abstract:
  8. Fire is one of the most important events in nuclear power plants which has a large share of total core damage frequency. For example, the core damage frequency in Bushehr nuclear power plant from fire accidents is 6.1E-6/ year which is equivalent to about 63 percent of core damage frequency from all internal accidents. However, due to the unavoidable presence of flammable materials, e.g. Electrical equipment, cables, gas, flammable liquids, …), it is impossible to prevent fires in these plants . Fire at nuclear power plants may be caused directly or indirectly by one or more initiating events, which the following accidents in turn would threaten the safety of the plant. In this project, Fire-PSA is used to analyze fire, which includes deterministic and probabilistic parts. In fire deterministic analysis, various scenarios are simulated using the CFAST code, which could be benchmarked against the FDS code. On the other hand, in the probabilistic fire analysis one would use event trees in conjunction with the RiskSpectrum code. It should be noted that no fire simulation code has been previously executed for the Bushehr Nuclear Power Plant. Here, we aim at obtaining more accurate analysis of the fire accident which would ultimately lead to more realistic values of core damage frequency. In this project, the safety of IR-360 nuclear plant is considered after a fire accident in parts of auxiliary building. The results indicate the core damage frequency to be equal to 5.1E-5 in this situation. Based on the obtained results, some proposals have been provided, which reduce the risk of fire in the investigated parts. As a result, the total core damage frequency has been reduced slightly.
  9. Keywords:
  10. Probabilistic Safety Assesment (PSA) ; Event Tree ; Fire Accident ; Fire Probabilistic Safety Assesment ; CFAST Code ; Non-Supperssion System

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