The annual outages in the Olkiluoto nuclear power plant ended late Tuesday night when the Olkiluoto 2 (OL2) plant unit was connected to the national grid at 10:06 PM, said the owner of the plant Teollisuuden Voima Oyj (TVO) in a press release.
The annual outage at OL2 started on 25 May and took 30 days and 4 hours.
The most significant work activities carried out at OL2 included, leak tightness tests in the containment and on isolation valves, the replacement of electrical feedthrough modules in the containment as well as measurements related to the replacement of the steam separator and tests associated with the annual maintenance of the new fuel transfer machine.
This year, OL2 was the last one of the annual outages which started on 1 May.
At the Olkiluoto 3 (OL3) plant unit the outage was completed already on 29 April and the refuelling outage at the Olkiluoto 1 plant unit ended on 22 May.
During the annual outage of OL2, an incident related to radiation protection occurred on 1 June in connection with the handling of a control rod.
Due to malfunctioning equipment, the control rod was lifted too close to water surface.
Because of this, the employees working in the reactor hall were exposed to a higher than normal radiation dose.
However, the radiation doses were extremely low and did not cause any danger to the workers.
After the investigation of the incident and corrective actions, the annual outage could be continued as planned.
Also, the schedule of the maintenance activities at OL2 had to be extended due to some technical challenges connected with the new fuel transfer machine and the failure of the equipment used in reactor inspections.
As a result of this event, there was a possibility that some foreign material had ended up in the reactor that had to be located and retrieved, which took time.
- OL2
- Resumes
- Operation
Source: www.dailyfinland.fi
