Posiva is an Expert Organisation in Nuclear Waste Management

Posiva Oy is an expert organisation responsible for the final disposal of spent nuclear fuel of the owners.
Posiva has been established in 1995.

Why is copper a suitable material for final disposal canisters?

Copper endures the anoxic conditions deep inside the bedrock and will not corrode. There have been findings in the natural environment of metallic copper which is many millions of years old and it has retained good protective characteristics.

When will final disposal begin?

The final disposal of spent nuclear fuel is intended to begin in 2022.

What is the current location of the spent nuclear fuel?

At the moment, the spent nuclear fuel is stored in water basins in interim storage facilities at the Olkiluoto and Loviisa power plants. The water cools down the fuel assemblies and provides protection against radiation.

What will be the total amount of spent fuel?

According to existing plans, the Loviisa 1–2, Olkiluoto 1–2 and Olkiluoto 3 plant units will produce electricity for 50–60 years. Production results in about 5,500 tonnes of spent fuel. In addition, the operation of the planned Olkiluoto 4 unit for 60 years will increase the total amount of spent fuel up to 9,000 uranium tonnes.

How long will the final disposal of the spent fuel take?

The final disposal of spent fuel from the existing nuclear power plant units and the Olkiluoto 3 unit currently under construction will take about 100 years.

Have the effects of permafrost and a possible ice age been observed in planning the final disposal?

Yes. In the past, ice ages have been regular events and they are expected to also occur in the future. As a result, ice age conditions will be taken into account when planning the final disposal. Posiva carries out research in Greenland in permafrost conditions.


Posiva is granted construction licence for final disposal facility of spent nuclear fuel

The Finnish Government has today granted a licence to Posiva for the construction of a final disposal facility for spent nuclear fuel. After an extensive and multidisciplinary research and development work Posiva can now proceed to construction of the final disposal facility in Olkiluoto according to the concept it has developed. The final disposal of the spent fuel generated in the Olkiluoto and Loviisa nuclear power plants into the Finnish bedrock is planned to start in the early 2020's.

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05.11.2015 Posiva sets sights on export markets

Posiva Oy, a Finnish expert company in nuclear waste management, has developed a final disposal solution for spent nuclear fuel within a pioneering R&D initiative. The solution attracts wide global interest and Posiva is now about to convert the expertise accumulated over several decades into a business opportunity. To this end, Posiva aims at offering expertise services on global markets.

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Photos of ONKALO
ONKALO etusivunkuva en
Take a look at the image gallery and watch videos about final disposal and ONKALO.

What is final disposal about?
Onkalo maisemassa etusivunkuva
How will the final disposal of spent nuclear fuel be carried out in practise?

Posiva Core Question
Core Question Quiz
Play Posiva Core Question, the quiz and learn more on the safe management of spent fuel disposal.

Canister 1
Disposal of spent fuel has been studied for decades. Reports can be found on our website.

Demo2 etusivunkuva
Underground research facility ONKALO is at Olkiluoto. What happens there?

Nettisivuille etusivulle videokuva 2
Take a look at the video of the Time Travel to Final Disposal.