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.


News

18.06.2015 Impact of permafrost on final disposal

Posiva has conducted thorough research on the impact of permafrost on the final disposal of spent nuclear fuel in the bedrock conditions of Olkiluoto. The Radiation and Nuclear Safety Authority of Finland (STUK) has assessed Posiva's research and in the safety assessment submitted by STUK in February to the Finnish Ministry of Employment and the Economy for the purposes of the construction licence of the final disposal facility, it concludes that final disposal can be implemented safely in accordance with Posiva's plan.

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22.05.2015 ONKALO hoist building reaches rooftop height

Work on the second phase of the ONKALO hoist building in Olkiluoto has reached rooftop height. After the second phase is complete, a personnel lift providing access to the underground facilities of ONKALO can be installed into the hoist building. The personnel lift will be the primary means of accessing the final disposal research tunnel for spent nuclear fuel, which reaches a depth of nearly 450 meters.

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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.

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

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

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