SITRON: Site risk assessment approach developed for Nordic countries

Ola Bäckström, Erik Cederhorn, Xuhong He, Jan-Erik Holmberg, Tero Tyrväinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional


    Currently, multi-unit risks have not typically been adequately accounted for in risk assessments, since the licensing is based on unit-specific PSA with focus on a reactor accident. Within Sweden and Finland a research project called SITRON on multi-unit risk has been ongoing since 2017. This paper outlines the approach, discussed within SITRON, on multi-unit risk taking into account various dependencies between the units, combination of plant operating states and relevant risk metrics to study. The approach has been developed with aid of two pilot studies made for two Swedish sites. The dependencies between units can be caused by external hazards, which can affect multiple units at the same time, shared operational and safety systems at the site and common staff who should manage the situations. The paper also presents high level results from the two pilot studies.
    Original languageEnglish
    Title of host publicationPSAM 14 - Probabilistic Safety Assessment and Management
    Subtitle of host publicationPapers
    Number of pages10
    Publication statusPublished - Sept 2018
    MoE publication typeD3 Professional conference proceedings
    Event14th Probabilistic Safety Assessment and Management Conference, PSAM 14 - UCLA Luskin Conference Center, Los Angeles, United States
    Duration: 16 Sept 201821 Sept 2018
    Conference number: 14


    Conference14th Probabilistic Safety Assessment and Management Conference, PSAM 14
    Abbreviated titlePSAM 2018
    Country/TerritoryUnited States
    CityLos Angeles


    • multi-unit
    • nuclear power plant safety


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