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Licensed Unlicensed Requires Authentication Published by De Gruyter June 24, 2022

Updating risk model for SGTR accident based on success criteria analysis

Meisam Mohammadnia, Seyed Mohsen Hoseyni ORCID logo and Kaveh Karimi
From the journal Kerntechnik


Success criteria analysis plays a key role in the development of realistic probabilistic safety/risk assessment (PSA/PRA) model because it provides supporting information regarding the response of complex nuclear power plant systems to different accident conditions. The current paper performs plant specific success criteria analysis for steam generator tube rupture (SGTR) accident in a typical pressurized water reactor (PWR) and demonstrates implementation of the obtained best estimate results on a risk model which has been initially developed based on expert judgment and general plant design data. The modifications on the risk model include configuration of the safety systems as well as the event tree structure. The updated PSA model shows 50% reduction in the plant core damage frequency (CDF) in comparison to the base case risk model. This highlights the importance of success criteria analysis for the development of a realistic PSA model in risk informed applications.

Corresponding author: Seyed Mohsen Hoseyni, Department of Basic Sciences, East Tehran Branch, Islamic Azad University, Tehran, Iran, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.


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Received: 2022-01-26
Published Online: 2022-06-24
Published in Print: 2022-08-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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