Segmented Waste Rods for Nuclear Fuel Disposal
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Solution Overview
Problem
Nuclear power plants face challenges in safely handling and disposing of spent nuclear fuel and related waste, which remains radioactive for several years, requiring specialized containment and handling due to its hazardous nature.
Innovation Solution
The development of segmented waste rods and waste rod segments that can contain and recycle materials from spent nuclear fuel, allowing for safe storage and disposal by mimicking the structure of conventional fuel rods, enabling them to be integrated into fuel bundles for efficient disposal or storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spent nuclear fuel and waste are placed in specialized hazardous materials landfills for disposal, then safe containment of radioactivity is achieved, but the volume of disposal facilities required increases and handling complexity increases
Solution Approach 1:
The patent integrates waste rod segments containing spent fuel and waste materials within the structure of reusable fuel assembly components (cladding, end plugs, support plates). These waste-containing segments are nested inside the fuel assembly framework, allowing dual functionality: the framework provides structural support for fresh fuel while simultaneously containing waste materials, thereby eliminating the need for separate disposal facility volume.
Solution Approach 2:
The fuel assembly structure is designed to serve multiple functions: it supports fresh fuel rods during operation, contains waste rod segments during storage and disposal, and provides radiation shielding. This multi-functionality allows the same structural components to handle both operational and waste disposal roles, reducing the need for dedicated disposal infrastructure.
2Reliability
If spent nuclear fuel is stored in spent fuel pools for decay, then radioactivity levels decrease over time, but storage space requirements and handling complexity increase
Solution Approach 1:
The patent combines waste storage functionality with the fuel assembly structure itself. Waste rod segments are integrated into the fuel assembly framework, merging the storage function with the structural support function. This eliminates the need for separate spent fuel pool space for waste storage, as the same structure serves both purposes.
Solution Approach 2:
Waste materials are nested within the fuel assembly structure, specifically within cladded waste rod segments that are positioned within the assembly framework. This nesting approach allows waste to be contained within the existing structural footprint of the fuel assembly, minimizing additional storage space requirements.
3Ease of operation
If conventional fuel rod structures are used for waste containment, then handling and storage procedures are simplified, but the ability to recycle materials from spent fuel is reduced
Solution Approach 1:
The fuel assembly is divided into discrete waste rod segments that can be independently handled, stored, and processed. Each segment contains specific waste materials and can be separated from the rest of the assembly for targeted recycling or disposal. This segmentation maintains ease of handling while enabling selective material recovery from different waste streams.
Solution Approach 2:
The patent facilitates the recovery of recyclable materials from spent fuel by integrating waste rod segments that can be selectively removed and processed. The segmented structure allows for efficient separation of recyclable components (such as cladding materials and structural elements) from non-recyclable waste, enabling material recovery programs to operate efficiently within the existing fuel assembly framework.
Data Source
AI summary
Example embodiments and methods may provide segmented waste rods capable of containing and disposing of waste generated from spent nuclear fuel, including elements left over from fuel that has been harvested for desired isotopes produced in the fuel. Example methods may provide methods for forming and using example embodiment segmented waste rods.