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- Cask design (2)
- Interim storage (2)
- Aircraft crash (1)
- BAM GGR 007 (1)
- Crushing test (1)
- Dry storage (1)
- Ductile iron (1)
- Dynamic crushing characteristics (1)
- Fracture mechanics (1)
- Hankinson's formula (1)
- Impact load (1)
- KOBAF (1)
- Lagerung (1)
- Lateral constraint (1)
- Leak tightness (1)
- Leakage rate (1)
- Lid-seal system (1)
- Metallic seal (1)
- Multiaxial stress state (1)
- Operating procedures (1)
- Package (1)
- Radioactive material storage (1)
- Radioactive material transport (1)
- Regulation (1)
- Safety (1)
- Safety assessment (1)
- Simulation (1)
- Spent fuel (1)
- Spruce wood (1)
- Storage (1)
- Storage cask (1)
- Transport (1)
- Transport casks (1)
Extended drop tests of DCI casks with artificial flaws demonstrating the existing safety margins
(1995)
An extensive series of large deformation crushing tests with spruce wood specimens was conducted. Material orientation, lateral constraint and loading rate were varied. Regarding material orientation, a reduction in the softening effect and the general force level was observed with a higher fiber-load angle. A comparison with characteristics gained by application of Hankinson's formula showed discrepancies in compression strength and the beginning of the hardening effect. Lateral constraint of the specimens caused a multiaxial stress state in the specimens, which was quantified with the applied measuring method. Further, a higher force level compared to specimens without lateral constraint and significant hardening effect at large deformations resulted. Thus, the influence of a multiaxial stress state on the force level could be determined. An increase in the loading rate led to higher force levels at any displacement value and material orientation.
Mechanical and thermal safety analyses and demonstrations for cubic DCI multipurpose containers
(1997)
German approach and feedback on experience of transportability of SNF packages after interim storage
(2014)
In Germany, the concept of dry interim storage of spent fuel in dual purpose metal casks is implemented, currently for periods of up to 40 years. The casks being used have an approved package design in accordance with the international transport regulations. The license for dry storage is granted on the German Atomic Energy Act with respect to the recently revised 'Guidelines for dry interim storage of irradiated fuel assemblies and heat-generating radioactive waste in casks' by the German Waste management Commission. For transport on public routes between or after long term interim storage periods, it has to be ensured that the transport and storage casks fulfil the specifications of the transport approval or other sufficient properties, which satisfy the proofs for the compliance of the safety objectives at that time. In recent years, the validation period of transport approval certificates for manufactured, loaded and stored packages were discussed among authorities and applicants. A case dependent system of 3, 5 and 10 years was established. There are consequences for the safety cases in the Package Design Safety Report, including evaluation of long term behaviour of components and specific operating procedures of the package. The present research and knowledge concerning the long term behaviour of transport and storage cask components have to be consulted as well as experiences from interim cask storage operations. Challenges in the safety assessment are e.g. the behaviour of aged metal and elastomeric gaskets under IAEA test conditions to ensure that the results of drop tests can be transferred to the compliance of the safety objectives at the time of transport after the interim storage period. Assessment methods for the material compatibility, the behaviour of fuel assemblies and the aging behaviour of shielding parts are issues as well. This paper describes the state of the art technology in Germany, explains recent experience on transport preparation after interim storage and points out arising prospective challenges.