International Affairs

In Switzerland, on-going activities regarding safety assessment of the different stages in the lifetime of nuclear installations consist of periodic assessments and assessments of long-term operation for existing Swiss NPPs.

When it comes to international affairs, Switzerland has signed the Convention on Nuclear Safety (CNS) on 31 October 1995. In November 2011, an IRRS Mission was conducted in Switzerland. The results of the mission are currently being implemented, and it is planned to have an IRRS Follow-Up Mission in 2015. In October 2012, an OSART Mission to the Mühleberg NPP was completed. Switzerland participated in the European Stress Test and its Follow-Up activities.


The continuous improvement of nuclear safety and security in Switzerland is the main concern of international cooperation. The regulatory exchange of information and experience plays an important role in this. The ENSI Board therefore updated and adopted the Strategy International Activities.

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Every six years, the EU Commission and the European Nuclear Safety Regulators Group (ENSREG) organise a Topical Peer Review (TPR): a thematically focused review of nuclear installations by international experts. The main topic of the 2023 TPR was fire protection in nuclear installations. Switzerland and numerous other European countries submitted a country report to ENSREG as part of the TPR. The interested public has now the opportunity to ask questions about these country reports.

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The conclusion of the experts from the International Atomic Energy Agency (IAEA) upon completion of the two-week review mission is that Switzerland has a robust nuclear security system. During the mission of the International Physical Protection Advisory Service IPPAS, from 30 October to 10 November 2023, the international team carried out a detailed examination of the national foundations and measures for the protection of nuclear installations, nuclear material and radioactive material against unauthorised intervention.

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