Posiva signs a contract on the ONKALO tunnel project with Destia Oy
Posiva has signed a contract with Destia Oy on further contracting related to ONKALO. The work comprises excavation of the access tunnel down to the level of technical facilities at the depth of 437 metres, and testing and demonstration facilities built at the final disposal depth (420 m). It is estimated that the project will be completed in spring 2011.
So far, the ONKALO access tunnel has been excavated for 4,200 meters to the depth of about 400 metres. The contract on tunnel project five covers the excavation of the last section of ONKALO to the depth of 437 metres. “After competitive bidding, reviews, and negotiations, Destia Oy was chosen to implement the last tunnel project related to ONKALO,” says Reijo Sundell, President of Posiva.
“On the basis of Destia's rock construction experience, the excavation of ONKALO is expected to proceed as planned so that the excavation will be completed in spring 2011. The contractor is currently being inducted to the ONKALO working methods and techniques, and the excavation activities with the new contractor will be launched after Easter,” says Pertti Huovinen, in charge of the project at Posiva's end.
Once the access tunnel has been excavated at the technical level at the depth of 437 metres, the ONKALO ventilation shafts can be drilled to their full length. After this, ONKALO's ventilation will be carried out through separate air intake and exhaust shafts.
In early March, Posiva signed a contract with Rakennustyöt Ville Kauppi Oy on the ventilation and hoisting equipment building project. It is estimated that the project will be completed by early April 2011. The plan is for the new ventilation building to take over the ventilation of ONKALO as of summer 2011.