In 1994, the Nuclear Energy Act came into force, according to which all nuclear waste must be treated, stored and disposed of in Finland. Before that some of the spent fuel was sent to Russia.(*01) Posiva Oy is responsible for the final disposal of spent nuclear fuel. It is established in 1995 by TVO and Fortum, two owners of nuclear power plants.(*02) Storage of spent fuel takes place on site until the final repository is finished. Finland hopes to begin with final disposal in granite around 2020-2025.

Onkalo
Preparations for the disposal of high level radioactive waste began in the late 1970s.(*03) In 1985, 102 potential sites were listed and in 1987 reduced to five for further research. This resulted in detailed site investigation at four sites from 1992 on, two of them at the Loviisa and Olkiluoto nuclear power plants. For all sites an environmental impact assessment was carried out and in May 1999, Posiva Oy proposed for a permit for the disposal at Olkiluoto in the municipality of Eurajoki. Local consent was highest in Olkiluoto and Loviisa, but at Olkiluoto a larger area was reserved for the repository and a larger part of the spent fuel was already stored there.
In January 2000 the town council of Eurajoki accepted the repository, followed by approval by the government and parliament in May 2001. In Finland the same disposal concept is applied as in Sweden.(*04) The construction application will be submitted in 2012, and operating license application in 2018. Posiva Oy expects that the first cannisters will go down in 2020 and final disposal will end in 2112. Around 2120, the repository is finally closed and sealed.(*05) Construction of an underground rock characterization facility (called Onkalo) started in 2004. This will later become (part of) the final repository.(*06)

In May 2010 it was found that the time schedule might not be met. The Finnish TV showed that there is still much research to be done before the application for the permit (scheduled end of 2012) can take place. The Director of the Research Department of Posiva Oy, Juhani Vira, stated his willingness to request the permit at a later date.(*07)
However, in the planned facility will not have enough space for the spent fuel from the already approved nuclear reactor at Pyhäjoki. In October 2011, TVO and Fortum stated that the repository could not safely be expanded to accommodate used fuel from Fennovoima’s planned plant.(*08) In March 2012, despite pressure from the government to make a deal, Posiva Oy maintains that it could not be extended any further without compromising its long-term safety.(*09)

Because Finland has the same disposal concept as Sweden, there is the same criticism on the stability of the granite and on the use of copper. Dr. Johan Swahn, Director of the Swedish NGO office for nuclear waste review, wrote in December 2009: “There is no way that anyone can honestly claim that Posiva has a completed robust safety case. The Posiva safety case has not been developed independently, but relies entirely on the Swedish safety case work. The final test of the Swedish safety case will not be done until the Swedish Radiation Safety Authority gives an approval of the safety analysis…This will not be the case before 2013-2014.” “Already now there is concern from the authority about the barrier systems of copper and clay. It is not clear if all relevant copper corrosion processes are known and the risk for clay erosion is still not understood. So an approval is not at all certain. And nothing can today be claimed to be robust.”(*10)

In 2010, the Swedish geologist Nils-Axel Mörner noted that there are many horizontal and vertical fractures around the planned repository. According to Mörner the safety is therefore not proven.(*11)
Geology Professor Matti Saarnisto, former Secretary-General of the Finnish Academy of Science and Letters, told in June 2010 Parliament that “an exaggeratedly positive image has been presented of the integrity of the structure of Olkiluoto’s bedrock”. He warns that a honeycomb of storage sites extending over an area of several square kilometres will weaken the bedrock, making it vulnerable to earthquakes, and that during an ice age permafrost could spread deep into the rock, potentially rupturing the canisters and releasing radioactivity into the groundwater.(*12)

“The matter of fact is that to some extent all of the research institutes involved are suffering from a hostage syndrome. They see it as essential that spent fuel be disposed of at Olkiluoto, because it has been planned that way for decades. There is no scientific basis for it,” Saarnisto said in 2009.(*13)

Sources
*01- Nuclear Monitor, Russian import of spent fuel imports stalled, 16 July 2004
*02- Posiva Oy: company website, visited 6 April 2012
*03- Posiva Oy Selecting the Site: the Final Disposal at Olkiluoto, company website, April 2012
*04- Mark Elam en Göran Sundqvist: The Swedish KBS project: a last word in nuclear fuel safety prepares to conquer the world?, In: Journal of Risk Research, Volume 12 Issue 7 & 8 2009, December 2009, p.969–988
*05- Posiva Oy, General Time Schedule for Final Disposal, website, April 2012
*06- NEA/OECD, Radioactive Waste Management and Decommissioning in Finland, 2011
*07- YLE (Finnish TV), 19 April 2010 and 25 May 2010.
*08- YLE: Posiva: No room for Fennovoima waste in nuclear cave, 4 October 2011
*09- World Nuclear News: No room at the repository, 9 March 2012. www.world-nuclear-news.org/WR-No_room_at_the_repository-0903127.html
*10- Swahn quoted in: House of Commons: Memorandum submitted by the Nuclear Waste Advisory Associates to UK Parliament, January 2010
*11- Mainpost: Endlager in Bergstollen statt unter der Erde (Repository in mountain tunnels, in stead of underground), 25 February 2011
*12- YLE: Posiva: No room for Fennovoima waste in nuclear cave, 4 October 2011
*13- IceNews: Finland set to become long-term nuclear waste dump, 29 August 2009