Probabilistic Safety Assessment (PSA) of Inadvertent Opening Safety Valve of Pressurizer (SVP) Using SAPHIRE Code

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Kordalivand, Saeid | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46275 (46)
University: Sharif University of Technology
Department: Energy Engineering
Advisor(s): Ghofrani, Mohammad Bagher
Abstract:
Inadvertent opening safety valve of pressurizer (SVP) is one of the most common initiator events in Booshehr nuclear reactors with occurrence frequency of 1.1E-0.2. This event has the third rank in initiator event among 16 other events (Loop and Compensated LOCA were ranked as first and second respectively). So special attention must be paid to SVP and the operators need to have specific trainings on this matter. In this thesis, the SVP as initiator event is being considered and the sequence which lead to core damage (CD), according to design informations is being modeled moreover the qualitative and quantitative analysis is carried out. In the modeling process we have used the SAPHIRE code. In first, regardless of the common cause failures (CCF) the CD frequency in Booshehr reactor due to SVP is obtained as 3.263E-09. After that by adding CCF, the CD frequency obtained as 8.00E-009. In documents of BNNP, that was done by Risk Spectrum code, the CD frequency due to SVP is obtained as 1.002E-08. Finaly using importance analysis for knowing import basic events as well as we has given little suggestion to reduce core damage frequency from SVP
Keywords:
Reliability ; Bushehr Nuclear Power Plant ; Initiating Events Analysis ; Probabilistic Safety Assesment (PSA) ; SAPHIRE Software

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