Half-way reached in annual outages at Olkiluoto nuclear power plant
The maintenance outage at Olkiluoto 1 has been completed. The plant unit was re-started in electricity production at 01.02 on 29 May. The refuelling outage at Olkiluoto 2 will start on 1 June according to plans.
Activities carried out in the 35th maintenance outage at the OL1 plant unit included, among others, the replacement of low-voltage switchgears in two divisions, piping modifications in the auxiliary feedwater system and the replacement of the auxiliary transformer.
All in all, some 1 500 activities comprising about 4 000 different work phases were planned for in the schedule. In terms of time, the outage works took a total of ca. 160 000 person-hours.
Preparations for the refuelling outage are now under way at the OL2 plant unit. In addition to refuelling, maintenance and repairs activities as well as tests are to be carried out, and two main service water pumps will be replaced. OL2 is expected to be back in electricity production on 9 June.
In addition to TVO's own personnel, some 500 subcontractor employees are involved in outage works at OL2. The total amount of person-hours is estimated to be ca. 30 000.
As good as new
The refuelling and maintenance outages carried out in alternate years at the plant units ensure that Olkiluoto nuclear power plant is kept in pristine condition at all times.
The annual outages are executed on the basis of maintenance and replacement programmes specified in detail for each device and component. Good advance planning including scheduled replacement of important equipment and their components is utilised to prevent failures in them. Apart from this, extensive modernisation and maintenance projects are implemented at the plant units every five years or so.
For more information, please contact: Mikko Kosonen, Senior Vice President, Production, tel. +358 2 8381 2100.
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