Spherical Steel Capsules for Uranium Waste Disposal
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Solution Overview
Problem
Current methods for disposing of uranium hexafluoride (UF6) waste are inefficient, as they involve cumbersome, slow, and expensive processes that are difficult to scale up for large quantities, and existing surface storage poses environmental and safety risks due to leakage and long-term stewardship challenges.
Innovation Solution
The development of spherical capsules made of steel or copper, engineered to house uranium waste products, which are then deposited in deep geological repositories within human-made caverns or lateral wellbores, utilizing a protective medium to minimize hydrostatic pressures and provide long-term containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UF6 is stored in surface or near surface facilities in tanks, then the waste can be stored accessible and manageable, but the environmental safety and long-term containment are compromised due to leakage risks and corrosion
Solution Approach 1:
The waste storage system is segmented into multiple protective layers: the UF6 waste itself, an inner corrosion-resistant container (copper or stainless steel), an outer structural container (steel or concrete), and surrounding backfill material. This segmentation isolates the hazardous UF6 from the environment while maintaining manageable access through the hierarchical structure.
Solution Approach 2:
The patent implements a nested containment structure where the UF6 waste is placed inside an inner corrosion-resistant container, which is then placed inside an outer structural container, with both nested within a excavated cavity in bedrock. This nested arrangement provides progressive protection while maintaining a compact, manageable storage unit.
2Ease of manufacture
If conventional cylindrical capsules are used for waste containment, then the construction process can be established, but the process becomes cumbersome, slow, and difficult to scale for large quantities of waste
Solution Approach 1:
The patent transitions from cylindrical to spherical capsule geometry. Spheres are more efficient to manufacture at scale through rotational molding or spherical shell fabrication, have lower surface-area-to-volume ratios reducing material usage, and can be more easily handled and emplaced. This geometric change enables scaling while maintaining construction feasibility.
Solution Approach 2:
The patent modifies key parameters of the containment system: changing from cylindrical to spherical geometry, using corrosion-resistant alloys (copper, stainless steel) instead of conventional materials, and implementing a dual-container nested structure. These parameter changes collectively improve manufacturability and scalability for large-scale waste disposal.
3Reliability
If deep geological repositories are used for waste disposal, then long-term containment and environmental protection are improved, but the complexity of emplacement and hydrostatic pressure management increases
Solution Approach 1:
Spherical capsules are optimally suited for deep geological repositories as they distribute hydrostatic pressure uniformly across their surface, unlike cylindrical containers that experience stress concentration at corners and edges. This geometric advantage simplifies pressure management while maintaining long-term containment integrity in deep underground environments.
Solution Approach 2:
The patent employs composite material structures: inner containers of copper or stainless steel for corrosion resistance, outer containers of steel or concrete for structural strength, and surrounding backfill material for mechanical support and pressure distribution. This composite approach manages both corrosion and hydrostatic pressure complexities.
Data Source
AI summary
Steel and/or copper spherical capsules are specifically engineered and manufactured for housing uranium waste products. The uranium waste products are placed within the spherical capsules. Human-made cavern(s) and/or substantially lateral wellbore(s) are constructed for receiving the uranium waste containing spherical capsules. The human-made cavern(s) and/or the substantially lateral wellbore(s) are deeply located in specific types of geologic rock formations thousands of feet below the Earth's surface. These uranium waste containing spherical capsules are loaded from the Earth's surface into the human-made cavern(s) and/or into the substantially lateral wellbore(s). The emplaced spherical capsules are surrounded by an immersive protective medium within the given human-made cavern(s) and/or within the substantially lateral wellbore(s). The given human-made cavern(s) and/or the given substantially lateral wellbore(s), with the uranium waste containing spherical capsules, are sealed off.