Säteilyturvakeskus (STUK)

The abnormal operational occurrence at Olkiluoto nuclear pover plant – the unit is stable

Share
A severe abnormal disturbance occurred at the Olkiluoto nuclear power plant Unit 2 today at 12.22 that led to reactor shut down. The disturbance was possibly caused by a fault in the purification system for the reactor water. The situation is now stable and the unit in a safe state. There was no radioactive release to the environment.

There is no need for protective measures due to the situation. There is no danger outside the unit and no radioactive release is expected. Iodine tablets shall not be taken, and it is no need for other actions as staying inside. The radiation situation outside the unit is normal.

The abnormal operation occurrence was initiated when the radiation measurement instrumentation inside the unit alarmed for increased radiation levels. The higher levels were detected in spaces where the levels are high even during normal operation. Consequently, there are no workers during operation. The personnel has not been exposed to radiation and there are no personnel injuries.

The containment building was isolated so that the plant and plant environment safety was ensured. Both the power company and STUK started their emergency organisations and activities according to emergency preparation plans. There is no indications of fuel leakage  and there are no more abnormal radiation levels at the unit.

The occurrence is an exceptional safety event. The safety systems functioned as designed. Consequently the risks for radiation exposure for personnel and environment was very low.

”STUK started the emergency activities immediately in full force due to exceptionally high radiation levels inside the unit. There are about 80 persons following the situation, but we do not see acute threat”, says Petteri Tiippana the director general for STUK.

STUK informs about the situation on Twitter and webpage.

To view this video from www.youtube.com, please give your consent at the top of this page.Ministry of social affairs and health and STUK press conference 10.12.2020 at 15.30.More videos

Keywords

Contacts

STUK Public Affairs, tel. +358 10 850 4761

About Säteilyturvakeskus (STUK)

Säteilyturvakeskus (STUK)
Säteilyturvakeskus (STUK)
Jokiniemenkuja 1
01370 Vantaa

Mediapalvelu: 010 850 4761http://www.stuk.fi

Säteilyturvakeskus (STUK) on sosiaali- ja terveysministeriön hallinnonalan viranomainen, joka valvoo säteily- ja ydinturvallisuutta Suomessa. Tehtävämme on ihmisten, yhteiskunnan, ympäristön ja tulevien sukupolvien suojelu säteilyn haitallisilta vaikutuksilta. 

Subscribe to releases from Säteilyturvakeskus (STUK)

Subscribe to all the latest releases from Säteilyturvakeskus (STUK) by registering your e-mail address below. You can unsubscribe at any time.

Latest releases from Säteilyturvakeskus (STUK)

Take part in scientific research – Submit an edible mushroom sample to the Radiation and Nuclear Safety Authority23.6.2025 14:58:25 EEST | Press release

From July until the end of November, the Radiation and Nuclear Safety Authority will organise the Mushrooms 2025 campaign, the aim of which is to examine radioactive cesium (Cs-137) concentrations and differences in concentrations in edible mushroom species in different parts of the country and in different mushroom species. During the campaign, the public can send edible mushroom samples from all over the country to the Radiation and Nuclear Safety Authority.

In our pressroom you can read all our latest releases, find our press contacts, images, documents and other relevant information about us.

Visit our pressroom
World GlobeA line styled icon from Orion Icon Library.HiddenA line styled icon from Orion Icon Library.Eye