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  • Background articles

    Non-Destructive Measurements on the Containment

    Feasibility Study for Non-Destructive Measurements on the Steel Pressure Shell of the Primary Containment of Nuclear Power Plants: the primary circuit, including the reactor pressure vessel, is enclosed by a steel pressure shell as part of the defence-in-depth safety barriers. Depending on the structural design of the nuclear power plant, this is directly surrounded by…

    Nuclear Facilities, Nuclear Power Plants
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  • Background articles

    PISA

    PISA, Pressure Vessel Integrity and Safety Analysis: in connection with the long-term operation of the Swiss nuclear power plants, it must be proven that the integrity of the reactor pressure vessel (RPV) continues to be guaranteed during normal operation and also in case of operating faults and postulated incidents. The PISA project was launched in…

    Nuclear Facilities
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  • Background articles

    ENSI Report on Fukushima IV: Radiological Effects

    Nine months after the disaster at the Fukushima nuclear power plant, Japan is working to contain radiation exposure in the region of the accident. The challenges confronting the country in this endeavour are shown by the new ENSI report on the radiological effects of the accident on 11 March 2011. ENSI already deduced some “Lessons…

    Chernobyl, ENSI, Fukushima
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  • Background articles

    ENSI Report on Fukushima III: Lessons Learned

    The analysis of the accidents at Fukushima confirms that Swiss nuclear plants are safe. However, the Swiss Federal Nuclear Safety Inspectorate (ENSI) has identified a variety of findings (Lessons Learned) from Fukushima which should now be utilised to continue optimising the safety of Switzerland’s nuclear power plants. All the measures that need to be implemented…

    ENSI, Fukushima
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  • Aufräumarbeiten Fukushima
    Background articles

    ENSI Report on Fukushima II: Analysis (People and Organisation)

    Inadequate technical design against tsunamis was indisputably a key factor in the accident at the Fukushima Dai-ichi nuclear plants on 11 March 2011.

    ENSI, Events abroad, Fukushima
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  • Background articles

    The 12 IRRS mission modules

    During the two-week IRRS mission, the IAEA experts will investigate how ENSI performs its supervisory duties. To ensure that this scrutiny of ENSI is conducted in an orderly and systematic manner, the IAEA has developed a list containing about 2000 questions.

    ENSI, International, IRRS Mis­si­on 2011/2015, Multilateral Cooperation
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  • Background articles

    ENSI Report on Fukushima I: Event sequences (Chronology)

    Immediately after the first live images of the accident in the Fukushima Dai-ichi nuclear power plant were broadcast all over the world on 11 March 2011, the Swiss Federal Nuclear Safety Inspectorate (ENSI) convened a group of internal experts comprising engineers, geophysicists, nuclear physicists and psychologists.

    ENSI, Fukushima
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  • Aktionsplan Fukushima 2012
    News

    ENSI presents its first Action Plan based on the Lessons Learned from Fukushima

    The Swiss Federal Nuclear Safety Inspectorate (ENSI) intends to continue improving the safety of Switzerland’s nuclear power plants. After its analysis of the events at Fukushima, ENSI therefore defined follow-up measures for the current year relating to eleven key topics.

    ENSI, EU Stress Test, Fukushima, Fukushima Action Plan
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  • ENSI kann Ausbreitung radioaktiver Stoffe berechnen
    News

    ENSI can calculate the dispersion of radioactive substances

    The dispersion calculation can be used by the responsible emergency organisations (in particular ENSI and the National Emergency Operations Centre, NEOC) to predict the direction in which a radioactive cloud will move after its release from a nuclear power plant.

    Emergency Preparedness, In the Event of an Incident, Propagation
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