Dry Uranium Fuel Kernel Forming for High-Density TRISO Particles
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Solution Overview
Problem
Conventional methods for producing TRISO fuel particles face challenges with low uranium density, incomplete carbon conversion, safety concerns due to high enrichment levels, and logistical issues related to liquid-based manufacturing processes, which complicate reactor operation and pose security risks.
Innovation Solution
A dry process is employed to produce uranium-based fuel kernels using enriched uranium, involving pelletization and thermal processing to achieve high burnup and low species migration, utilizing a press system with multiple compression stages to form spherical particles with precise dimensions and densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid-based manufacturing methods are used to produce uranium-bearing kernels, then high enrichment levels can be achieved to compensate for low overall uranium density, but safety and security risks are exacerbated
Solution Approach 1:
The patent changes the physical state parameter of the fissile material from liquid to dry/powder form. This fundamental parameter change allows achieving high uranium density through alternative means (particle concentration and packing) without requiring high enrichment levels, thereby reducing safety and security risks associated with handling concentrated liquid uranium solutions
Solution Approach 2:
The patent replaces the liquid-based chemical manufacturing system with a dry mechanical processing system. Instead of using liquid solutions and chemical precipitation, the invention uses dry powder handling, mechanical mixing, and thermal processing to form uranium-bearing kernels, eliminating the need for high enrichment liquid uranium and associated security risks
2Ease of manufacture
If conventional liquid-based methods are used for kernel production, then manufacturing can proceed with established processes, but logistical issues and operational complexity increase
Solution Approach 1:
The patent extracts and eliminates the liquid handling and chemical processing steps from the manufacturing process. By removing the liquid-based chemical precipitation and drying steps, the invention simplifies the manufacturing workflow to dry powder handling, mixing, and thermal processing, reducing logistical complexity while maintaining ease of manufacture
Solution Approach 2:
The patent changes the manufacturing approach from chemical-liquid-based to thermal-mechanical-based processing. This parameter change in the fundamental manufacturing methodology eliminates complex liquid handling, filtration, and drying operations, simplifying the overall manufacturing process and reducing logistical requirements
3Productivity
If high enrichment levels are incorporated to compensate for low uranium density, then burnup levels can be achieved, but safety concerns are exacerbated
Solution Approach 1:
The patent changes the approach to achieving burnup by modifying the physical form and concentration method of uranium rather than increasing enrichment levels. By using dry powder particles with controlled size distribution and packing density, high uranium density is achieved without requiring highly enriched uranium, thus maintaining productivity while reducing safety concerns
Solution Approach 2:
The patent employs composite particle structures where uranium-bearing particles are distributed within a matrix material. This composite approach allows achieving high effective uranium density and burnup levels through optimized particle concentration and packing, without requiring high enrichment levels of the uranium itself, thereby reducing safety concerns
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 method produces fuel kernels with high final density and controlled composition, enhancing fission product containment and reducing safety and security risks associated with liquid-based processes.
Implementation Method 1
the first tooling and the second tooling are configured to transition the first forming surface and the second forming surface from a first configuration for receiving an amount of dry fissile material for forming a bead between the first forming surface and the second forming surface
Implementation Method 2
thermally processing the particle to produce the fuel kernel
Data Source
AI summary
A method for producing a fuel kernel is provided. The method comprises producing a dry fissile material comprising enriched uranium, forming a particle from the dry fissile material, the particle having a diameter of 1 millimeter or less; and thermally processing the particle to produce the fuel kernel. A press system for dry fissile material is also provided.