CASTOR Ic-DIORIT Cask 21 Years After Its Commissioning

A SUCCESSFUL SOLUTION TO A LONG-TERM PROBLEM The CASTOR Ic-DIORIT transport and storage cask is the oldest cask under continuous normal operation worldwide and has now completed over 21 years of storage without a single problem since its commissioning in April 1983. This is the result of extensive studies made at the Paul Scherrer Institut since 1979 including international know-how exchange and the start of the assessments for the dry storage of 349 spent fuel elements of the former PSI reactor DIORIT, which was closed down in 1977 for final decommissioning.