Description
The canisters reach their maximum temperature in the repository after about 10 years. TIf the radial gap between the cast iron insert and the copper is closed at this temperature due to creep or plastic deformation (see FEP C04), cooling down to ambient temperature will cause a tensile strain in the copper shell due to the fact that the copper will shrink more than the cast iron when the temperature is decreasing.
SKB Number
SKB FEP Number
C05
Main Category
Main category for FEP
Internal process
System Component
System component to which the FEP applies
Cast iron insert and copper canister
Handling
Explanation of how the FEP is treated
Intact canister. Neglected since the thermal expansion will cause negligible strains in the materials.
Failed canister. Neglected.
References
Bibliographic references to obtain more information
SR-Site Fuel and canister process report, TR-10-46, Section(s) 1.10, 3.4.4