TY - JOUR
T1 - An overall safety concept for nuclear power plants
AU - Hyvärinen, Juhani
AU - Vihavainen, Juhani
AU - Ylönen, Marja
AU - Valkonen, Janne
N1 - Funding Information:
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). The support is gratefully acknowledged.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12/1
Y1 - 2022/12/1
N2 - 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.
AB - 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.
KW - Defence-in-depth
KW - Institutional strength-in-depth
KW - Nuclear safety
KW - Overall safety
KW - Safety system design
KW - Sociotechnical systems view
UR - http://www.scopus.com/inward/record.url?scp=85135380727&partnerID=8YFLogxK
U2 - 10.1016/j.anucene.2022.109353
DO - 10.1016/j.anucene.2022.109353
M3 - Article
AN - SCOPUS:85135380727
SN - 0306-4549
VL - 178
JO - Annals of Nuclear Energy
JF - Annals of Nuclear Energy
M1 - 109353
ER -