Total safety modernisation of Oskarshamn 2 completed before the turn of the year

Pressrelease Friday, March 13, 2015

It is now believed that the ongoing safety modernisation of Oskarshamn 2 (O2) will be completed before the turn of the year. The reason behind this assessment and the revised schedule is greater precision in the estimate of the time required for the remaining works and additional analytical works.

As better progress has been achieved in the safety modernisation of Oskarshamn 2 (O2), there is greater awareness of how long the remaining measures are expected to take. A summary of the milestones passed so far reveals that there is now about nine months work remaining before O2 can resume production. This is clearly a miscalculation compared with the original time estimate for these works, which were started in June 2013.

– Neither the underestimate of the complexity of the ongoing works nor the additional works mean that there is any less confidence that it will be possible to achieve the project's ultimate objective, observes MD Johan Svenningsson. We now have the very extensive installation work behind us and are moving into the final phase of the project. This is where we will primarily be conducting the comprehensive trials and tests to verify that the plant satisfies the requirements for a modernised nuclear power plant.

Based on the Swedish Radiation Safety Authority's approval of OKG's ongoing safety reports earlier this year, a major step has been taken towards being able to start trial operation of the plant once the works have been completed. This can be viewed as acknowledgement of the authority's confidence in the organisation's ability during work in the remaining nine months to meet the short-term and long-term commitments documented in the regular safety reports.

The modernisation process has so far involved the implementation of several major, complex stages. For example, a high volume of cabling has been laid in the existing plant, a new control room and a new simulator are now in place and operator training programmes have started. The focus from now on will primarily be on commissioning, testing and analysis.

– In projects such as this, there are always very strict demands on safety and quality in implementation, and time must be allowed for this. When we resume operation at the plant, according to the revised schedule on 20 December, we will have moved from a level that was already high to an exceptionally high level in terms of the plant's safety, concludes Johan Svenningsson.


  • The safety modernisation process began on 1 June 2013 and is the second last stage planned in the modernisation of O2. The ultimate objective is a plant with a safety upgrade, a higher power output and a technical service life of sixty years.
  • It has been calculated that after the project is completed, the plant will be able to deliver electricity for at least another 20 years.
  • The modernisation process creates added value for both electricity consumers and the environment, by replacing fossil-based electricity production in the European energy system equivalent to 1 million tonnes of carbon dioxide a year.
  • When the works have been completed, 800 tonnes of new components will have been installed in the plant. More than 1,100 kilometres of cables will also have been laid. The work affects around 7,000 items in the plant and the heaviest lifting process is 158 tonnes. Approximately 100,000 electrical connections and 20,000 welds will have been completed. In total, more than 3,000 people from several European countries are involved in the project.
  • The modernisation project will be concluded with a power increase from 660 MW to 840 MW.

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Page updated Friday, March 13, 2015