|
|
 |
|
|
Dry Storage Container Lid Clamps
The Project
After removal from the spent fuel storage bay, spent nuclear fuel can be stored in above ground Dry Storage Containers (DSC’S). These DSC’s are loaded with fuel underwater in the spent fuel bay, and the top of the DSC is capped with a lid. Prior to transfer of the DSC’s to an area where they can be dried and have their lids permanently welded into place, a temporary lid clamp must be installed to ensure that the DSC contents will be safely retained during all required handling and transportation activities.
|
|
In-Bay Clamp
|
The Solution
This Dry Storage container (DSC) lid clamp measures 33” high by 95” wide by 107” long, and weighs 4500 lbs. It has an actuation mechanism that swivels a series of dogs inward from each side of the clamp to engage the top flange of a DSC and hold its lid in place.
In order to meet stringent structural integrity requirements, Numet designed the clamp specifying very large welds at all adjoining sections. Extensive custom fixturing and carefully sequenced welding is required to ensure that the tight tolerances required across the clamp are not lost due to the warpage that typically would occur from a large welding heat input into this kind of configuration. These stainless steel clamps are fabricated with no post-weld machining.
Numet has supplied two versions of this clamp, one for use in the fuel bay, and one for outdoor transportation of the DSC’s. The In-bay version of the clamp has a single actuation mechanism that can be remotely actuated for attachment to a DSC underwater in a spent fuel bay, with the use of simple manual extension tooling. Dog sets on the Transfer clamp each have their own actuation mechanism to ensure that damage to a single mechanism during transportation on the site could not result in lost functionality of the clamp.
As part of the clamp supply Numet developed testing fixtures and fully demonstrated all functionality of the clamps by simulating actual loading conditions and verifying all mechanical operations.
|
|
Transfer Clamp
|
Project Responsibility Highlights
- Operation and Maintenance Manuals
|
|
'))
'))
