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  • IAEA Building in Vienna
    Background articles, Posts

    Ten Years on from Fukushima (5/6): Switzerland’s International Position

    After the accident at Fukushima, there was an increasing demand for international safety standards and their international monitoring. Switzerland, and in particular ENSI, was committed to mandatory backfitting on a global basis. Even if such safety principles are still not legally binding, the reactor accident acted as a booster for a new safety awareness amongst…

    ENSI, Ten Years on from Fukushima
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  • Background articles, News, Posts

    Ten Years on from Fukushima (4/6): The Consequences for Swiss Nuclear Power Plants and the Oversight Activities

    After the events in Fukushima Daiichi, ENSI ordered immediate actions and additional safety tests for the Swiss nuclear power plants. Moreover, from the accident analysis and the EU stress test, ENSI derived a need for action to improve nuclear safety in Switzerland: the “Fukushima Action Plan”.

    ENSI, Fukushima, Fukushima Action Plan, Ten Years on from Fukushima
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  • Background articles, Interviews, News, Posts

    Ten Years on from Fukushima (3/6): the EU Stress Test

    The tests at the time confirmed that, in international comparison, Swiss nuclear power plants have a high safety level. Despite these learnings, it is important to remain attentive at all times, to keep the proofs of safety up to date, to live a strong safety culture and to systematically analyse events.

    ENSI, EU Stress Test, Fukushima, Ten Years on from Fukushima
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  • Background articles, Interviews

    What Oskar Grözinger learned from his international reviews

    Oskar Grözinger has spent most of his working life in nuclear regulation. During the EU stress test, the physicist was deputy chairman of the “Topic 1 – External Influences” division.

    ENSI, EU Stress Test, Ten Years on from Fukushima
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  • Background articles, Interviews

    How Nils Cordua companioned the EU stress test at ENSI

    Nils Cordua was the project leader at ENSI during the EU stress test in Switzerland. He has been working at ENSI since 2010 and is now a specialist in systems engineering.

    ENSI, EU Stress Test, Ten Years on from Fukushima
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  • Background articles, Interviews

    How Jukka Laaksonen initiated the EU stress tests

    Jukka Laaksonen was Chairman of the Western European Nuclear Regulators Association (WENRA) and Director General of the finnish nuclear safety authority Säteilyturvakeskuksen (STUK) when the events in Fukushima took place. He has held nuclear safety expert positions within the International Atomic Energy Agency (IAEA), the Organization for Economic Co-operation and Development (OECD) and the European…

    ENSI, EU Stress Test, Ten Years on from Fukushima
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  • Containment

    Containment comprises the primary and secondary containment. Primary containment is the containment building that surrounds the nuclear part of a nuclear power plant. Containment forms a part of the safety barriers which, in the event of an accident, prevent the uncontrolled release of radioactive substances into the environment. For more information, see the sixth part of…

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  • INES 7

    According to a guideline issued by the International Atomic Energy Agency (IAEA), an accident is classified as INES 7 if there has been a release of more than 50,000 terabecquerels of radioactivity. This value was exceeded at Fukushima. The becquerel (Bq) is the unit used to measure the activity of a radioactive material. 1 Bq…

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  • Core meltdown

    The radioactive decay of fission products generates heat which, if there is no cooling, results in impermissible overheating of the fuel. Then a core meltdown occurs when the fuel heats up until its melting point is reached.

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