Finland is leading the world when it comes to permanently disposing of spent nuclear fuel in a deep geologic repository. Their Onkalo facility recently completed excavation of the first of five final disposal tunnels, a 1.7 km long tunnel. Ground Engineering magazine has a nice article about the project and the recent milestone, but there is a very cool article by BusinessInsider.com where their science reporter got a tour of the facility and has lots of great photos and videos. If you really want to see how the facility will operate, check out that article. One of the videos is shown below, an animation of how the waste capsules will be stored in vertical shafts extending below the main disposal tunnels.
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A stretch of tunnel on Eastbound I-70 in scenic Glenwood Canyon Colorado was closed last March because of a 70-foot long crack in the ceiling. Since then the two-lane westbound bore has been handling both eastbound and westbound traffic while repairs to the damaged segment were undertaken. This project has a little of everything: heavy excavation, rockfall, slab reinforcing, geofoam, and even geogrid! Read on for more details, a map and photos. (Photo by Concrete Works Of Colorado)
TBM Stuck on Pittsburgh North Short Connector Project
ENR reports that a Tunnel Boring Machine or TBM is stuck for the second time in two weeks on Pittsburgh’s light rail expansion project dubbed the North Shore Connector Project. As we described in a previous post, the project will consist primarily of a tunnel underneath the Allegheny River. The drilling began the week of March 3 and has been progressing at a rate of 30-ft/day or 5-ft/day faster than the original goals. Read on for a location map of the project, or download the Google Earth KMZ file showing the project area. (File photo of TBM)