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...