ENSI, the Swiss Fed­eral Nuclear Safety Inspec­torate is the national reg­u­la­tory body with respon­si­bil­ity for the nuclear safety and secu­rity of Swiss nuclear facil­i­ties.

Accord­ing to the leg­is­la­tion, nuclear safety is the respon­si­bil­ity of the operator. ENSI reviews their reports, conducts supervisory discussions and monitors nuclear plants – with over 400 inspections a year for instance.