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Nuclear Safety Authority identified faults in Olkiluoto nuclear power plant

The Radiation and Nuclear Safety Authority (STUK) informed on its own
website on 14 April under the section Surveillance News that Teollisuuden
Voima, TVO, had detected and subsequently repaired defects and deficiencies in the
seals of the connectors of third unit (OL3) of the Olkiluoto nuclear power

The seals are required in the event of an accident. Should the seals
be missing, the measurements required for containing the accident could be
affected, compromising the safety functions of the plant.

As the incidentwas accompanied by inadequate guidance and the defect was detected in
several locations, TVO concluded that the incident falls under category one
on the International Nuclear and Radiological Event Scale (INES). According
to the INES, the incident was classified as an Anomaly. The absence of a
single seal as such is not a safety issue, but the recurrence of the error
increased the significance of the incident on the assessment scale. TVO
submitted its own assessment to STUK in connection with the incident report
in April, and STUK made a decision based on its own assessment, in which it
concurs with TVO’s INES assessment.

 STUK 15th May 2023


May 19, 2023 - Posted by | Finland, safety

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