An overall safety concept for nuclear power plants

Juhani Hyvärinen, Juhani Vihavainen, Marja Ylönen*, Janne Valkonen

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    13 Citations (Scopus)

    Abstract

    A comprehensive understanding of the “safety” of nuclear reactors is essential for effective and efficient safety management by licensees and regulation by authorities. Nuclear reactors are designed subject to incomplete knowledge of factors that affect their safety. The idea of defence-in-depth has evolved to combat the threat of the unknown; it is implemented by means of technical artefacts, leading to a complex set of technical safety requirements to prevent accidental radioactive releases. Nuclear power plants have thus become systems of technical systems. Similarly, significant human and organizational aspects are involved in nuclear power plant construction and operation; a nuclear power plant is an organization of organizations. Earlier studies have identified the need for holistic understanding of safety and accounting for the technical and organizational aspects simultaneously (Harvey and Stanton, 2014). This paper seeks to clarify the concept of defence-in-depth using the Overall Safety Concept (ORSAC) developed at LUT (Hyvärinen et al., 2016), and the sociotechnical systems view in the nuclear power industry context, extending defence-in-depth thinking to the organizational context in one transparent framework. We show how organizational and technical aspects affect each other in the operation of nuclear power plants. This paper paves the way for systematic modelling of how technical and organizational aspects affect each other.

    Original languageEnglish
    Article number109353
    JournalAnnals of Nuclear Energy
    Volume178
    DOIs
    Publication statusPublished - 1 Dec 2022
    MoE publication typeA1 Journal article-refereed

    Funding

    The work was funded by the Finnish Research Programme on Nuclear Power Plant Safety (SAFIR 2022) in project OSAFE (Development of overall safety framework, 2019-2020).

    Keywords

    • Defence-in-depth
    • Institutional strength-in-depth
    • Nuclear safety
    • Overall safety
    • Safety system design
    • Sociotechnical systems view

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