Olli Nummi, Fortum, Finland

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Presentation transcript:

Olli Nummi, Fortum, Finland Implications of the CAST results for the disposal systems in crystalline host rocks Olli Nummi, Fortum, Finland The project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 604779, the CAST project.

Repository concepts (I) SKB’s repository for short-lived low and intermediate level waste, Forsmark, Sweden Low and intermediate level waste repository, Loviisa, Finland

Repository concepts (II) Repository concept for spent fuel and low and intermediate level long lived waste (including i-graphite) in Lithuania Czech repository concept for spent fuel and intermediate level waste

Crystalline rock Stable Fractured Flow in open fractures Reference scenario of Posiva’s TURVA-2012 safety case (Posiva 2012-12)

Safety functions Waste form Engineered barriers Repository location in bedrock (Bedrock properties)

Sensitivity analysis - LEI Release from irradiated graphite

Sensitivity analysis – Fortum Release from solidified ion-exchange resins into host rock

Sensitivity analysis – SURAO Release from intermediate level waste into host rock Equivalent flow rate between backfill and rock Sorption coefficient in rock Sensitivity indices Porosity of rock Porosity of the backfill Sorption coefficient in backfill

C-14 release & migration Release rate (corrosion, leaching…) Sorption (C-14 speciation) Barrier performance Groundwater flow In the repository In bedrock …

Impact of CAST results Inventory Release rate C-14 speciation More realistic inventory Release rate Low steel corrosion rates Updated release model (graphite) C-14 speciation Confirmation of earlier assumptions? Sorption of organic C-14 Communication between CAST members

Reduction of conservatism LEI - release from irradiated graphite

Outlook Integration between experimental work and safety assessments Transfer of the results Longer term experiments – steel corrosion not not stabilized? Sorption of C-14, change of speciation?