Final disposal

Final Disposal

The disposal of spent nuclear fuel must be organised in a way that is not harmful to organic nature. Spent nuclear fuel from the nuclear power plants of Teollisuuden Voima and Fortum will be packed in copper canisters and embedded in Olkiluoto bedrock at a depth of 400-450 metres.

Final Disposal Concept

The final disposal of spent nuclear fuel is based on the use of multiple release barriers, which ensure that the nuclear waste cannot be released into organic nature or become accessible to humans. A deficiency of a single barrier or a predictable geological or other change will not endanger the performance of the insulation. The release barriers include the physical state of the fuel, the disposal canister, the bentonite buffer, the backfilling of the tunnels and the surrounding rock.

Final Disposal Facility

The spent nuclear fuel is packed into the disposal canisters at the encapsulation plant. The canisters are then transported by a lift to the underground repository.


The spent nuclear fuel is stored in the interim stores at Fortum's power plant in Hästholmen in Loviisa and at TVO's power plant in Olkiluoto in Eurajoki. The fuel is transported from the power plants to the encapsulation plant in special casks as special transports.

Total Schedule for Final Disposal

Plenty of time has been reserved for the preparatory stage and the implementation stage of final disposal. Thorough preparations and implementation will ensure the safety of final disposal. The final disposal of spent nuclear fuel is planned to start in 2020's and will continue for almost a hundred years.

More Posiva's videos in here or Posiva's YouTube channel.

Share article:
This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.


To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.