Dual Shock-Absorption Layout for Compact Radioactive Packaging
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Solution Overview
Problem
Existing internal damping systems for radioactive material packages are oversized due to a need to absorb maximum decelerations, leading to a compromise between size, cost, and performance, particularly in axial direction, and do not effectively manage deceleration forces on closure systems during axial falls.
Innovation Solution
A dual damping system is implemented, with independent first and second damping devices tailored to the specific deceleration needs of the storage device and radioactive elements, respectively, allowing for differentiated deceleration values and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single internal damping system is used to protect both the storage device and radioactive elements during axial fall, then the system must accommodate the lower of the two maximum decelerations, but this leads to significant oversizing of the damping system and the entire packaging in the axial direction
Solution Approach 1:
The internal damping system is segmented into two independent damping devices: a first damping device positioned between the storage device and the lid, and a second damping device positioned between the radioactive elements and the lid. Each damping device is independently sized according to the specific deceleration requirements of the component it protects, eliminating the need to oversize the entire system based on the lower of the two deceleration values.
Solution Approach 2:
Each damping device is designed with local quality tailored to its specific protective function. The first damping device has properties optimized for the storage device's deceleration requirements, while the second damping device has properties optimized for the radioactive elements' deceleration requirements. This allows each component to be precisely sized for its specific protective need rather than being constrained by a uniform design approach.
2Reliability
If the internal damping system is oversized to protect both components, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The damping system is divided into two independent, functionally distinct devices with different design criteria. This segmentation allows each device to be optimized for its specific protective role, reducing overall system complexity compared to a single oversized device that must accommodate both protection requirements simultaneously.
Solution Approach 2:
Instead of designing a single damping system based on the more restrictive (lower) deceleration requirement, the invention inverts the approach by designing two separate systems, each based on the specific deceleration requirements of the component it protects. This inversion eliminates the need to accommodate the more restrictive requirement across the entire system.
3Device complexity
If a single damping system is used, then device simplicity is maintained, but the forces transmitted to the lid fixing device during axial fall are not effectively limited
Solution Approach 1:
The damping system is segmented into two independent devices that independently limit forces transmitted to the lid fixing device. The first damping device limits forces from the storage device, while the second damping device limits forces from the radioactive elements. This segmentation ensures that both force transmission paths are independently controlled, effectively protecting the lid fixing device without requiring a complex unified system.
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 dual damping system optimizes compactness and performance by accounting for the varying deceleration resistance of storage devices and radioactive elements, reducing overall size while effectively absorbing potential energy without risking system failure.
Implementation Method 1
The internal damping system comprises a first plastic deformation damping device for dampening the storage device
Data Source
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AI summary
The invention relates to a package comprising radioactive content and to packaging for transporting and/or storing said content, the packaging comprising an internal shock-absorption system (22) housed in the confinement chamber between the radioactive content and an axial blocking member of the chamber, the radioactive content comprising a storage device and one or more radioactive elements. The internal shock-absorption system (22) comprises a first shock-absorption device (40) for absorption by plastic deformation in order to provide shock absorption for the storage device (30), and a second shock-absorption device (50a-50f) for absorption by plastic deformation associated with a radioactive assembly formed of one or more radioactive elements, the first and second shock-absorption devices being designed to operate independently of each other and to take account of the maximum decelerations that can be withstood by the storage device and the radioactive elements accommodated in said device.