Figure 1.
The panel a shows fuel pellet of uranium dioxide enclosed within a cladding tube, then placed inside a copper canister with cast iron insert, followed by surrounding bentonite clay within crystalline bedrock and final repository extending underground to 500 metres depth. Panel b shows dimensional layout of canister insert and surrounding materials, with total length 875 millimetres, insert length 475 millimetres, buffer sections of 50 millimetres, and a 10 millimetres void near copper canister wall, along with pre compacted bentonite ring, pellets, and wall rock forming buffer and geosphere regions.The KBS-3 disposal concept. (a) Diagram of the disposal system from fuel pellet up to the deep geological repository. (b) Cross-section sketch through the Lasgit deposition hole showing the canister, engineered void, pre-compacted bentonite ring, pellets, and wall rock. The bentonite ring and pellets make up the buffer, isolating the canister from the geosphere