Events

ENSI subsumes events and findings under the term incidents. Both incidents with implications for nuclear safety (art. 21 para. 1 NEO and art. 38 para. 3 let. a and c NEO) as well as incidents of public interest (Art. 38 para. 3 let. b NEO) must be reported. The latter includes incidents on the site of the nuclear plant that are perceptible from outside of the plant regardless of whether they are significant in terms of nuclear safety.

Events in Swiss Nuclear Power Plants

A faulty resistor on an electronic card led to the failure of a module in the turbine control system. As a result, the control dampers on the low pressure turbines closed slowly. According to its design, the plant reacted by shutting down the turbines and automatically reducing the reactor power to 67% by inserting control […]

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News

Documents

In 2014, the licensees complied with their statutory obligations to provide ENSI with reports and nuclear safety at all plants was rated as good. There were 38 reportable events in the Swiss nuclear power plants: 5 events at each of the two Beznau units, 11 at Gösgen, 9 at Leibstadt and 8 at Mühleberg. During the year under review, there was one reactor scram, which […]

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In 2013, there were 34 reportable events in the Swiss nuclear power plants: 7 events at the two Beznau units, 7 at Gösgen, 7 at Leibstadt and 13 at Mühleberg. During operation, there were no reactor scrams recorded. On the INES scale, ranging from 0–7, ENSI rated all reportable events in nuclear power plants in 2013 as Level 0.   […]

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There were no incidents in Swiss nuclear power plants in 2012 that could have had a detrimental effect on the safety of people and the environment. This is evident from an evaluation   the results of over 400 inspections, both unannounced and announced, together with operating data and event notifications from plant operators.

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The central message of the 2011 Oversight Report of ENSI, the Swiss Federal Nuclear Safety Inspectorate is both clear and brief: There were no incidents in Swiss nuclear facilities during 2011 that could have compromised human safety. In recent years, such a rational statement had, for many, become routine. However, in 2011 that was no […]

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Since the catastrophic events at the Fukushima plant in Japan on 11 March 2011, there has been a fundamental shift in the way the public regards nuclear facilities in Switzerland. Just one month before Fukushima, the electorate in the canton of Bern had voted in favour of a replacement nuclear power plant at Mühleberg on […]

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In 2009, as in previous years, ENSI rated the operation of the Swiss nuclear facilities as safe. Nevertheless, it was not an optimal year for nuclear safety. After systematic safety reviews at the Leibstadt and Mühleberg nuclear power plants, ENSI awarded both facilities a «good» rating. Both facilities were able to maintain the high safety […]

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HSK became ENSI (Swiss Federal Nuclear Safety Inspectorate) on 1 January 2009 giving formal independence to nuclear regulation in Switzerland. In so doing it complied with the provisions of the Swiss Nuclear Energy Act and the international Convention on Nuclear Safety, both of which demanded formal and effective separation between the body responsible for nuclear […]

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2007 saw major changes to energy policy in Switzerland – a new national energy strategy, the new Federal Electricity Supply Act, the concept for a Master Plan for a deep geological repository and new legislation governing ENSI, the Swiss Federal Nuclear Safety Inspectorate, all of which will impact on the work of the Inspectorate. In […]

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This Surveillance Report is a part of a comprehensive system of reporting by the Inspectorate. In addition to this report, the Inspectorate publishes a separate Radiological Protection Report, a Research and Experience Report and a Management Report. These four reports appear each spring. The original language for all reports is German but the prefaces, introductions […]

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This Surveillance Report is a part of a comprehensive system of reporting by the Inspectorate. In addition to this report, the Inspectorate publishes a separate Radiological Protection Report, a Research and Experience Report and a Management Report. These four reports appear each spring. The original language for all reports is German but the prefaces, introductions […]

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