Abstract
Abstract A central repository for low- and medium-level radioactive waste from the Swedish nuclear power plants has been constructed at Forsmark, Sweden. The most active waste will be disposed of in a rock cavern, designed as a silo 69 m high and 30 m in diameter. Because the rock stability requirements are stringent, pre-investigations were very extensive. The initial rock stresses were measured at several points. Based on these investigations, an analysis of the behavior of the silo was performed using the Finite-Element Method. During construction, the behavior of the rock mass around the silo was monitored with extensometers. Very small deformations of a few millimeters were measured; these were comparable with the calculated results.
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