Summary report of the decommissioning plan for the Olkiluoto power plant

The decommissioning plan for the nuclear power plant units TVO I and II at Olkiluoto is based on approximately 40 years of operation and 30 years old safe storage prior to dismantlement. A handing chamber for the segmentation of the activated reactor vessel and its internal components will be built in each reactor hall. The segmented activated waste will be packed in concrete containers with thick walls. The contaminated components will be dismantled, segmented and packed in lighter concrete boxes. Large contaminated components will be disposed of as such, segmented into smaller size according to transport limitations. The waste will be disposed of in the bedrock of Olkiluoto by extending the VLJ repository. For the activated waste, a separate bedrock silo will be excavated and inside it a reinforced concrete silo will be built. The contaminated waste will be placed in two shotcreted bedrock silos. The time required for the dismantlement of the two power plant units, conditioning of the spent reactor internals and disposal of the waste totals approximately 15 years. The actual dismantlement will take about 7 years. (28 refs., 19 figs., 23 tabs.)