High earthquake protection of Beznau NPP confirmed

The Swiss Federal Nuclear Safety Inspectorate ENSI has published its report on the assembly deviation on two of six emergency diesel generators at the Beznau nuclear power plant (KKB). ENSI concludes that KKB was safe and protected against earthquakes despite the assembly deviation.

As a consequence of Fukushima, ENSI increased the earthquake protection requirements for all Swiss nuclear power plants in 2012. At that time, KKB provided the necessary verifications with a positive result. In 2020, however, the assembly deviations on the emergency diesels were discovered. As a result, it only became clear in retrospect that the formal requirements had not been fully met in the event of an earthquake, which is to be expected only once every 10,000 years. This resulted in a formal deviation during two months (April and May 2012). With the commissioning of two retrofitted diesel generators in June 2012, the requirements were met again according to the authority.

Thanks to various retrofits and other measures, ENSI certifies that the KKB has a very high level of earthquake safety. Over the past decades, Axpo has invested around CHF 2.5 billion in the reliability and safety of the plant. During the months of April and May 2012, the level of earthquake protection was the same as in the months and years before.

In the meantime, KKB has analysed the reasons for the non-detection of the assembly deviation and various measures are being implemented. For example, additional checks are being carried out on ongoing projects to determine whether the components supplied correspond to the design. In addition, existing processes are being analysed and adjusted if necessary.

More media releases

Show all

Wind power 26.11.2021

Axpo signs long-term PPA for three wind farms in Lithuania

Axpo expands its business activities in the field of long-term power purchase agreements (PPAs) for renewable energies to the Baltic countries by signing its first ever PPA in Lithuania. Under the agreement with the Taaleri SolarWind II fund, Axpo Nordic will hedge parts of the electricity gener-ated by the Anykščiai, Rokiškis, and Jonava wind farms currently under construction. The transac-tion supports the roll-out of wind energy in Lithuania and marks a major milestone for Axpo Nor-dic’s expansion plans in the Baltic region.

Read more

Hydropower 25.11.2021

Wägital power plant: first partner plant celebrates 100th anniversary

The City of Zurich and Nordostschweizerische Kraftwerke AG (today Axpo) jointly established AG Kraftwerke Wägital in the canton of Schwyz 100 years ago. It was Switzerland’s first example of a power plant established as a partnership with multiple owners. The plant continues to produce climate-friendly electricity for thousands of households today.

Read more

Renewable energy 15.11.2021

Axpo plans new green hydrogen production plant in Swiss town of Brugg

Plans to build another green hydrogen facility close to its run-of-river power plant in Brugg, Switzerland were announced by Axpo today, marking the latest development in the company’s rapid expansion of its green hydrogen business. A memorandum of understanding (MOU) has been signed with local partners, confirming Axpo’s intention to deliver climate-friendly hydrogen to filling stations in the region. The project will make an important contribution to decarbonisation in the Swiss mobility sector.

Read more