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  • News, Posts

    Findings on fuel elements in Leibstadt NPP: ENSI is classifying the incident as INES 1 and checking the submitted measures

    An inspection of fuel elements in Leibstadt NPP revealed that critical boiling states – so-called dryouts – had systematically occurred over several cycles. The Swiss Federal Nuclear Safety Inspectorate (ENSI) is classifying this incident as Level 1 on the International Nuclear and Radiological Event Scale (INES). It is currently checking the documents and actions submitted…

    Events, Leibstadt Nuclear Power Plant, Nuclear Facilities
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  • Background articles, Posts

    Dryout: Preventing inadequate cooling of fuel rods

    Heat is generated in the reactor as a result of nuclear fission. To guarantee optimum cooling of the fuel rods, their cladding tubes must always be covered with a film of water. If they are not completely covered with water in specific areas, this is referred to as “dryout”.

    Leibstadt Nuclear Power Plant, Mühleberg Nuclear Power Plant, Mühleberg nuclear power plant (decommissioned), Nuclear Facilities
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  • News, Posts

    Beznau and Gösgen nuclear power plants must check their steam generators

    The Swiss Federal Nuclear Safety Inspectorate (ENSI) requires that the Beznau and Gösgen nuclear power plants check the quality and design of the forgings of the steam generators in respect of adherence to the material specifications. In doing so, ENSI is reacting to information from France.

    Beznau Nuclear Power Plant, Gösgen Nuclear Power Plant, Nuclear Facilities
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  • News, Posts

    ENSI reviews reactor pressure vessel safety case submitted by Beznau 1

    Monday, Axpo submitted the documents for characterisation and assessment of the findings in the base material of the Beznau 1 reactor pressure vessel. The Swiss Federal Nuclear Safety Inspectorate (ENSI) will review these and decide whether Beznau 1 nuclear power plant will receive permission to restart. In its assessment, ENSI will be advised by the…

    Beznau Nuclear Power Plant, Nuclear Facilities
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  • News, Posts

    Swiss nuclear power plants are unaffected by irregularities at the Le Creusot Forge

    The Swiss nuclear power plants use forgings for the safety-relevant main components with fully documented manufacturing and material quality certificates. This was confirmed by the operators in response to an enquiry made by the Swiss Federal Nuclear Safety Inspectorate (ENSI).

    Beznau Nuclear Power Plant, Gösgen Nuclear Power Plant, Leibstadt Nuclear Power Plant, Mühleberg Nuclear Power Plant, Mühleberg nuclear power plant (decommissioned), Nuclear Facilities
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  • Background articles, Posts

    Unannounced inspections

    «I’m a site inspector for ENSI, responsible for the Beznau NPP. Every week I pay a control visit to the nuclear power plant without prior announcement. I’m interested in everything, including ladders that have fallen over and that you can trip over. Thanks to their training and experience, inspectors know what to look for. We…

    Domains/Sections, ENSI, Nuclear Facilities, Organisation
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  • Background articles, Posts

    A focus on upgrading

    «Nuclear power plants are periodically upgraded with modern technology, such as here in Beznau. Together with my section I check, in a multi-stage approval procedure, whether electrical and process control upgrades fulfil the legal requirements and can be implemented without reservation. Only then do we issue approval for operation. We do not allow ourselves to…

    Domains/Sections, ENSI, Nuclear Facilities, Organisation
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  • Allgemein

    Safe renaturalisation

    «After the cessation of operations nuclear power plants are demolished and the site renaturalised. The professional disassembly and of the installations takes many years. We ensure that the owners of nuclear installations comply with the legal requirements and that the safety of the population and the skilled workers involved is also guaranteed during decommissioning. For…

    Decommissioning, Nuclear Facilities
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  • Background articles, Posts

    Safety analyses: The latest methods

    «Nuclear power plants are among the most robust industrial constructions in Switzerland. We ensure that operators constantly question the safety of their installations, calculate any residual risk using the latest methods and constantly improve the resilience of the installations with targeted upgrading. ENSI’s requirements with regard to earthquake safety, for instance, are considered to be…

    ENSI, ENSI as an employer, Nuclear Facilities
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