Annual outages were completed at the Olkiluoto nuclear power station in Finland at 05:52 local time on 18 June when the Olkiluoto-2 plant unit was reconnected to the national grid, owner and operator Teollisuuden Voima Oyj said.
The outage for Unit 1 consisted of refuelling and a number of tasks which were postponed from last year’s annual outage because of the Covid-19 epidemic. The work included replacement of the main transformer and a pressure test of the reactor primary circuit. The refuelling outage started on 25 April and ended on 11 May.
The outage for Unit 2 started on 16 May and ended on 18 June. In addition to refuelling, major work included pump and piping replacements in the cooling system, replacement of containment electrical penetration modules, feedwater system recirculation line modification, a containment leak-tightness test and inspection and vacuum cleaning of the reactor pressure vessel bottom.
