Canister Design 2012

This report summarises the design of the Posiva disposal canister for spent nuclear fuel. The report presents the design bases, the reference design, and summarises the performance analyses carried out for the design. The report mainly addresses the long-term properties of the canister, but operational safety aspects are also included because they may affect long-term safety. Report presents the detailed design of the reference canister (for BWR fuel) and in more general terms the variant designs for the other nuclear fuel types (VVER and EPR/PWR). The design report also describes the main features of the canister manufacture, encapsulation and handling. This report addresses aspects concerning the manufacture, quality control, mechanical strength, chemical resistance, nuclear engineering analyses, thermal dimensioning, canister handling and material ageing phenomena. Interaction of canister and other engineered barriers are included in the study. The evolution of repository and its main drivers are considered if they have an impact on the canister performance. This report fulfils the requirements of the preliminary safety analysis-report (PSAR) concerning the description of the disposal canister and of its performance qualification in the expected repository conditions during its long-term evolution.