POSIVA Report 2012-10



Safety Case for the Disposal of Spent Nuclear Fuel at Olkiluoto - Biosphere Assessment 2012


Posiva Oy



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Biosphere Assessment sits within Posiva Oy’s safety case “TURVA-2012” report portfolio and has the objectives of presenting the assessment methodology, a summary of the surface environment at the Olkiluoto site and an assessment of the surface environment scenarios that have been identified in Formulation of Radionuclide Release Scenarios.


A base scenario, variant scenarios and disturbance scenarios are considered. For the base scenario, a Reference Case has been identified and analysed. For the other scenarios, a range of biosphere calculation cases has been identified and analysed. All calculation cases, except cases addressing inadvertent human intrusion, are based on repository calculation cases, assessed in Assessment of Radionuclide Release Scenarios, in which failure of a single spent fuel canister gives radionuclide releases to the biosphere within the dose assessment time window of ten millennia. The biosphere calculation cases take into account uncertainties in the development of the terrain and the ecosystems, land use, location of the releases to the surface environment, radionuclide transport properties and dietary profiles.


The resulting annual doses to humans for all calculation cases for the base and variant scenarios are below the radiation dose constraints for most exposed people and other people, as set out by the Finnish regulator, generally by more than two orders of magnitude. The resulting absorbed doses rates to plants and animals for all calculation cases imply that any radiological impacts of these releases will be negligible.


Safety case, safety assessment, biosphere assessment, spent nuclear fuel repository, Olkiluoto, TURVA-2012, BSA-2012


Safety Case for the Disposal of Spent Nuclear Fuel at Olkiluoto - Biosphere Assessment 2012 (pdf) (18.1 MB)


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