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Nuclear safety and security

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  • Background articles, Posts

    Series of articles on barriers 4/6: The reactor pressure vessel (primary circuit part 1 of 2)

    The reactor pressure vessel, together with the water’s cooling circuit, is the second barrier for trapping radioactive substances.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 3/6: The fuel rod cladding tubes (fuel assemblies part 2 of 2)

    The fuel pellets are filled into metal tubes. Together with the nuclear fuel matrix, the cladding tubes are the first barrier for trapping radioactive substances in nuclear power plants.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 2/6: The nuclear fuel matrix (fuel assemblies part 1 of 2)

    The nuclear fuel is pressed into pellets and compacted using the sintering process before use in nuclear power plants. This process transforms the nuclear fuel into a ceramic material, which is able to retain the fission products that arise during operation in the nuclear fuel matrix.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Background articles, Posts

    Series of articles on barriers 1/6: Barriers protect people and the environment from radioactive substances

    The barrier concept aims to trap sources of radiation in nuclear facilities across several levels. Similar to the layers of an onion, independent barriers ensure that the risk from sources of radiation are minimised for people and the environment.

    Barrier Principle, Defense in depth, ENSI, Nuclear Power Plants, Nuclear Safety and Security, Radiation Protection, Security
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  • Oversight of Safety Culture in Nuclear Installations

    In this report, ENSI illustrates how it supervises safety culture. Based on a model for the over-sight of safety culture, it demonstrates that the supervisory authority cannot treat the entire content of safety culture in the same way. Part of this content can be observed and assessed with classical supervisory instruments, whereas other content –…

    Documents, ENSI, ENSI as regulatory body, Nuclear Safety and Security, Safety Culture, Strategy documents
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  • News, Posts

    After Fukushima, ENSI reviewed its own oversight culture and derived appropriate measures

    Analyses of the events in Fukushima revealed that the operator was not solely responsible for the failures in the run-up to the earthquake and tsunami, but rather that the supervisory authorities were also partly responsible. The Swiss Federal Nuclear Safety Inspectorate (ENSI) therefore took this opportunity to review its own oversight culture.

    ENSI, Integrated Oversight, Nuclear Safety and Security
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  • Oversight Culture 2015: ENSI Report on Oversight Practice

    Documents, ENSI, Human and organisational factors, Integrated Oversight, Nuclear Safety and Security, Other documents
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  • ENSI’s Remit

    ENSI monitors the operation of nuclear plants

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