NUHOMS® 61BT Dry Shielded Canister
The NUHOMS®-61BT Transportable DSC for BWR fuel. The canister has a stainless steel outer shell and is double seal welded to ensure 100% reliable confinement for the NUHOMS® 40 year design life and beyond. The DSC has shielding at both ends to provide low exposure rates during canister sealing operations and during the storage campaign. The 61BT stainless steel basket consists of tubular fuel compartments grouped together and wrapped by over-sleeves to form 9 and 4 compartment assemblies. The compartment assemblies are connected to perimeter rail assemblies. The rail assemblies provide the circular perimeter geometry that fits the basket inside the DSC shell. By incorporating the bundled tube and the tube-in-tube geometry features, the basket of this 61BT canister achieves superior structural rigidity, while minimizing welding. The 61BT rail assemblies surrounding the basket provide a wider footprint for distributing the mechanical loads from the basket under the most severe accidental conditions including drop scenarios. The rail assemblies also provide a path for thermal conduction from the basket to the shell with minimum gaps resulting in more efficient heat rejection and lower cladding and basket temperatures in the 61BT. Once loaded with fuel, the DSC is drained, vacuum dried, and backfilled with pure helium to provide an inert environment for the fuel and basket components during storage.
Payload
| BWR Fuel Assemblies |
61 |
Maximum Burnup |
40 GWd/MTU, (60 GWD/MTU by 2006) |
| Minimum Decay Time |
5 Years |
Maximum Enrichment |
4.4 w/o U235
(5 w/o by 2006) |
| Thermal |
18.3 kW, (up to 33 KW by 2008) |
Materials of Construction
| Shell and Cover Plates |
Stainless Steel |
| Shield Plugs |
Carbon Steel |
| Basket Assembly |
Stainless Steel
Aluminum |
Physical Data
| Outside Diameter |
67" |
| Outside Length |
196" |
| Cavity Length |
180" |
| Weight, Empty |
45,400 lbs. |
| Weight, Loaded |
88,400 lbs. |
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