Although they are nearly at the final depth, the work thus far has been primarily to construct the 4-km long access tunnel. The facility is not scheduled to accept the nuclear waste until 2020 but once it does, it will have enough space for about 7 reactor’s worth of spent fuel for 100-years of their operation. That would put final sealing of the facility in 2120. One interesting thing that caught my attention is that according to Posiva, the agency responsible for facility, after 500 years the radiation dose standing next to one of the canisters would be equivalent to a CAT Scan. [Source: hs.fi via Ontario-geofish]
Regional
Finland’s Nuclear Waste Storage Plans
As the U.S. continues to fight over hurdles for its Yucca Mountain Nuclear Waste repository, Finland is on track to become the first country with a permanent storage facility for spent fuel rods from nuclear reactors. Their Onkalo tunnel, on the western coast of Finland will eventually stretch for 5-km (2-miles) and reach a depth of 500-m (1,600-ft) in solid granite bedrock. Once at depth a grid of horizontal tunnels will be constructed. Vertical storage holes will be excavated in these horizontal shafts, and the spent rods, encased in steel cannisters with copper corrosion protection, will be placed on layers of bentonite clay. The clay will cushion the cannisters and protect them against long term geologic movement. The clay also serves as a barrier to water, swelling in its presence to seal off any cracks or conduits for water that could potentially transport nuclear contamination in the distant future if the primary measures of protection are compromised. The tunnels will eventually be backfilled with bentonite and rock. The facility is projected to open in approximately 15 years at a cost of about 3 billion euros. The projected life of the facility is through 2100. Links after the break. (Illustration by BBC)
Share this:
Miscellaneous
France starts on nuclear waste storage project
Project Related
