The safety of Swiss nuclear power plants and their continuous inspection is one of ENSI’s most important areas of responsibility. ENSI instructed Switzerland’s nuclear power plant operators to participate in the EU stress test to compare all four sites with others in Europe and to have them inspected by ENSREG and the European Commission.

Directly after the accident in Japan’s Fukushima Dai-ichi nuclear power plant on 11 March 2011, ENSI ordered immediate measures for a review of the safety of the Swiss nuclear power plants. In parallel, an interdisciplinary team of experts from ENSI (the “Japan Analysis Team”) reconstructed the events of the accident and subjected them to in-depth analysis.

ENSI intends to maintain the highest standard of quality with regard to its work. For this reason, a group of experts from the International Atomic Energy Agency (IAEA) has carried out a thorough inspection at ENSI between 21 November and 2 December 2011.

Despite the known presence of fissures, the core shroud of the Mühleberg power plant (KKM) does not represent a risk until further notice. Further information about the core shroud in the Mühleberg nuclear power plant can be found in this dossier.

In order to ensure protection, the nuclear power plant operators are obliged to review the hazard at regular intervals on the basis of experience and the latest developments in science and technology. Additional information about external flooding as it affects Swiss nuclear power plants can be found in this dossier.