Open-access content [Tanya Weaver](/authors/tanya-weaver) — Wed 12 Mar 2025
**Finnish nuclear power company TVO has reported a radioactive reactor coolant leak at Finland’s Olkiluoto 3 (OL3) nuclear power plant.**
In a statement posted on its website, the company said that about 100 cubic metres of radioactive reactor coolant had leaked into containment rooms at OL3 during the reactor’s annual outage for maintenance activities.
The leaked reactor coolant flowed from the containment rooms into the floor drain system, which has been designed to collect and drain any reactor coolant leakages.
TVO said this area is closed to the environment.
The incident occurred as a result of a “human error through a hatch of the reactor pool that had not been closed properly”.
The statement underlines that the incident did not pose any risk to personnel, the environment or nuclear safety.
Cleaning work commenced soon after the leak was found, with personnel instructed about necessary changes in accessible areas.
TVO said it has initiated an investigation into the incident and will implement necessary actions to prevent it happening again.
The radioactive wastewater will be handled in accordance with appropriate procedures.
TVO’s statement also said that the annual outage work at OL3 will continue as planned.
In January 2025, Sweden announced it had broken ground on a [repository](https://eandt.theiet.org/2025/01/17/sweden-breaks-ground-final-repository-bury-radioactive-waste-nuclear-power-plants) to bury radioactive waste from nuclear power plants.
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Paragraphs Gated content: restricted Add "paragraphs" to build your page. Types of paragraph include headings, a WYSIWYG (rich text) field, images, galleries, and so on. Section Specify a custom text colour? No Text colour #000000 Specify a custom background colour? No Background colour #ffffff Background image position center Background size cover Tile background image? No Padding 0 Remote video (e.g. Youtube, Vimeo) WYSIWYG (rich text) Sikorsky has successfully flown its drone prototype that lifts off vertically like a helicopter but cruises like an airplane.
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