On 25 July 2006, Forsmark Unit 1 experienced a short circuit in the offsite 400kV switchyard causing the inoperability of two emergency diesel generators.
This event identified weaknesses in the electrical system design that could be generic for nuclear power plants. In January 2008, the NEA CSNI formed the Defence in Depth Electrical Systems (DiDELSYS) task group.
This report is a status report of the country actions and responses to the vent in short term and to the up-to-date responses to the DIDELSYS task group findings in long term.
NEA (2011), Status of Country Regulatory Response to the Forsmark-1 Event 25 July 2006 and CSNI DiDELSYS Task Group Report Recommendations, OECD Publishing, Paris
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