Defective fuel rods removed from reactor at Olkiluoto 1– estimated duration of work one week

Defective fuel rods have been found at OL1 nuclear power plant unit. According to preliminary estimates, three fuel assemblies are to be removed from the reactor because of this and replaced with new assemblies. Electricity production at the plant unit will be stopped for the duration of the work on Monday 11 April 2016. The replacement is estimated to take approximately one week.

Radioactive substances are released to some extent from the defective fuel rods into the reactor water, but this causes no danger to the environment.

- Fuel damage is detected at nuclear power plants every now and then. Radioactive releases affect the radiation doses of the plant employees. Careful work planning and scheduling ensures that the accumulated radiation doses of the personnel remain low, despite the situation, explains Mikko Kosonen, Senior Vice President, Electricity Production.

There are a total of 500 fuel assemblies in the reactor core. Each assembly comprises almost one hundred fuel rods.

For more information, please contact:

Mikko Kosonen, Senior Vice President, Electricity Production,
Tel. +358 2 83 81 2100

Teollisuuden Voima Oyj is a nuclear power company founded in 1969 for safe and reliable electricity production for its shareholders, Finnish industrial and energy companies. Nuclear electricity generated at TVO's Olkiluoto plant covers approximately one sixth of the annual electricity consumption in Finland. Climate-friendly nuclear electricity not only benefits the Finnish society but also reduces the environmental impact of energy production.

About Us

Teollisuuden Voima Oyj has produced electricity for its shareholders, Finnish industrial and energy companies, safely and reliably for nearly 40 years. Nuclear electricity generated at TVO's Olkiluoto plant covers approximately one sixth, increasing to nearly one third once Olkiluoto 3 EPR is completed, of the electricity consumption in Finland. Climate-friendly nuclear electricity not only benefits society but also reduces the environmental impact of energy production. Moreover, the world's first final disposal facility for spent nuclear fuel is under construction in Olkiluoto.

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