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Probabilistic Safety Assessment of A UF6 Production Process

Ebrahimi, Behrooz | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42006 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani, Mohammad Bagher
  7. Abstract:
  8. Identification of different hazards in a UF6 production process, and evaluation of the risk originated from these hazards is the main objective of this project. A number of hazards are present in a typical UF6 production process, such as leakage of chemical gases like HF and F2 and also radioactive UF6 gas release. In order to evaluate risk due to these hazards, probabilistic approach has been used. Due to lack of probabilistic safety criteria (PSC) for chemical releases, only for UF6 gas release risk assessment has been done. As a first step in PSA of this process eight groups of initiating events have been identified using HAZOP study, and for each initiating event, event tree analysis (ETA) has been performed. Safety system reliability estimation is done using fault tree analysis (FTA) and results have been used in event trees. For safety systems with redundant parts common cause failure (CCF) analysis is considered. Results of the PSA study show poin estimates frequency of 3.77E-04 1/yr for radioactive gas relaease which is acceptable according international PSC. Another significant result of the study is ranking of systems, components and accidents according to their contribution to the overall risk of the process. Importance analysis results show great contribution of CCFs and human errors to the risk of the plant. Finally based on these results a series of suggestions for safety improvement of the process has been proposed
  9. Keywords:
  10. Importance Analysis Method ; Probabilistic Safety Assesment (PSA) ; Common Cause Failure

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