Perforated Metallic Impact Limiters for Nuclear Cask Protection
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Solution Overview
Problem
Current impact limiters for nuclear waste transport casks are either expensive to manufacture, scarce in supply, or have drawbacks such as being non-homogeneous and flammable, necessitating the need for improved impact protection systems.
Innovation Solution
The proposed solution involves the use of detachably coupled cylindrical impact limiters with deformable and crushable annular metallic perforated impact barrels, which absorb impact forces by radially collapsing and deforming, thereby reducing the g-load and protecting the nuclear waste storage vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional impact limiters (honeycomb structures, wood, plastic foams) are used, then impact protection is provided, but they are expensive to manufacture, scarce in supply, or have drawbacks such as being non-homogeneous and flammable
Solution Approach 1:
The invention changes the material parameter from traditional honeycomb/wood/foam structures to a solid metallic material (aluminum, magnesium, or zinc alloy). This parameter change maintains impact protection effectiveness while dramatically improving ease of manufacture, as the solid metal can be extruded continuously and is not subject to supply constraints or flammability issues.
Solution Approach 2:
The invention uses a composite structure combining a solid metallic outer shell with an inner core of crushable honeycomb or foam material. This composite approach provides the homogeneity and fire resistance of metal while retaining the energy-absorbing characteristics of the inner core, resolving the contradiction between reliability and ease of manufacture.
2Ease of manufacture
If solid metallic impact limiters are used, then ease of manufacture and homogeneity are improved, but the ability to absorb impact energy through deformation is reduced compared to crushable materials
Solution Approach 1:
The invention segments the impact limiter into two functional zones: an outer solid metallic shell that provides structural integrity and fire resistance, and an inner crushable core (honeycomb or foam) that absorbs impact energy through deformation. This segmentation resolves the contradiction by assigning each material's optimal function to the appropriate zone.
Solution Approach 2:
The composite structure combines the advantages of solid metal (ease of manufacture, homogeneity, fire resistance) with crushable materials (energy absorption). The metal shell maintains structural integrity while the inner core deforms to absorb impact energy, simultaneously satisfying both requirements.
3Reliability
If impact limiters with larger diameter are used, then impact protection effectiveness is improved, but the cask package width increases causing clearance issues in tunnels and bridges
Solution Approach 1:
The invention uses a thin-walled solid metallic shell as the impact limiter, which provides adequate structural strength and impact protection while maintaining a compact diameter. The thin-walled design allows the cask package to fit within tunnel and bridge clearance constraints while still providing effective impact protection through the shell's structural integrity and deformation characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The new impact limiter design effectively reduces the peak g-load during impact events, minimizing physical damage to the cask and its contents, while also being more economical and easier to manufacture compared to existing solutions.
Implementation Method 1
The proposed solution involves the use of detachably coupled cylindrical impact limiters with deformable and crushable annular metallic perforated impact barrels, which absorb impact forces by radially collapsing and deforming
Implementation Method 2
The proposed solution involves the use of detachably coupled cylindrical impact limiters with deformable and crushable annular metallic perforated impact barrels, which absorb impact forces by radially collapsing and deforming
Data Source
AI summary
A nuclear waste cask with impact protection includes impact limiters comprising deformable energy-absorbing perforated sleeves. An impact amelioration system for nuclear fuel storage components includes impact limiter assemblies at the bottom cask to canister interface including impact limiter plugs frictionally engaging corresponding plug holes formed in the cask closure plate. A nuclear waste fuel storage system includes an unventilated cask including a heavy free-floating radiation shielding lid loosely coupled the top end of the cask in a movable manner via the anchor bosses which provides cask overpressurization protection. A nuclear waste cask includes an axially elongated rectangular cuboid cask body having a cavity for holding nuclear waste materials and cask locking mechanism including first locking protrusions on the lid which are selectively interlockable with mating second locking protrusions on the cask body to lock the lid to the cask body.