Both units at Fortum’s Loviisa nuclear power plant are back in production upon completion of their annual outages. The annual outage of Unit 2 lasted nearly 26 days, until 13 September 2019, and the maintenance outage of Unit 1 lasted 20 days, until 27 September. Both units underwent a refuelling outage, during which about one quarter of the fuel was replaced.
The planned duration of Unit 2’s refuelling outage was exceeded by about eight days because of the repairs made during the annual outage to the cooling piping of two of the four emergency generators where leaks had been discovered in the periodic test carried out in July. Additional inspections and tests were conducted also on the cooling piping of the two other generators; they didn’t require additional measures.
In addition to the normal periodic maintenance tasks and refuelling, tasks related to maintenance and continuous improvement, such as modification of the primary water purification system’s filtering, was carried out on both units. The modification enables more effective filtering of impurities in the primary circuit; this is expected to lead to a significant reduction in radiation doses during future annual outages. During the annual outage a new fibre optic connection to the containment building was deployed to enhance process system monitoring and accelerate data transmission in the future.
In addition to the 500 Fortum employees who participated in the Loviisa annual outage that began in August, there were also about 800 external workers. Some 90 per cent of the workers are Finns.
Thomas Buddas, Deputy Director, Loviisa power plant, tel. +358 10 455 3710
Loviisa power plant
In 2018, the load factor at Fortum’s fully-owned Loviisa nuclear power plant was 88.4%. On an international scale, the load factor was among the best in the world for pressurised water reactor power plants. The plant produced a total of 7.79 terawatt hours (net), which is more than 11% of Finland’s total electricity production. The Loviisa power plant employs more than 500 Fortum employees and nearly 100 permanent employees of other companies working in the plant area every day. In 2018, Fortum invested about EUR 100 million in the Loviisa nuclear power plant. www.fortum.com/loviisa