ENSI, the Swiss Federal Nuclear Safety Inspectorate is the independent regulatory body with responsibility for the nuclear safety and security of Swiss nuclear installations.
ENSI’s organisation is governed by the ENSI Act (ENSIA).
ENSI’s executive bodies comprise:
- the ENSI Board,
- the Executive Board,
- the auditors.
The ENSI Board is ENSI’s independent strategic and internal regulatory body. The members of the ENSI Board are elected by the Federal Council and report directly to it. The Federal Council also nominates the President of the ENSI Board.
As the operational management body, the Executive Board is chaired by the Director General.
The auditors are elected by the Federal Council for a period of four years. The term of office may be extended once for a further four years.
ENSI is divided into divisions and sections. The organisational regulations define the tasks, responsibilities, organisation and management of ENSI.
The Organisational Chart forms part of the organisational regulations.
News
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Change in Leadership of the Nuclear Power Plants Division at ENSI
Dr. Annette Ramezanian is stepping down from her position at the Swiss Federal Nuclear Safety Inspectorate ENSI and will leave ENSI on October 30, 2026.
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Federal Council approves ENSI Board’s 2025 activity and business report
The ENSI Board considers ENSI’s oversight of Swiss nuclear installations to be responsible, effective and of high quality.
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New Chief of Staff of the Directorate Division
On 25 March, the Board of the Swiss Federal Nuclear Safety Inspectorate (ENSI) appointed Patrick Tschudin as the new Chief of Staff of the Directorate Division. He will take up his post on 1 August this year. The lawyer and current head of the Legal Section succeeds Andreas Schefer, who will continue to work for…
Background articles
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Ten years on from Fukushima, the ENSI Board still holds that safety has priority over political or economic interests
Where there are conflicts of interest between politics, safety and profitability, safety must always take priority. This is one of the most important lessons learnt from the Fukushima nuclear accident.
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Prevention of sabotage and theft: an overview
«The protection of nuclear installations and nuclear materials against sabotage, violent actions or theft has to be based on an in-depth defence system which involves structural, technical, organisational, personnel and administrative measures. In my section we examine the measures in effect at nuclear installations on the basis of national and international requirements. To determine the…
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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…