SiC Fiber-Reinforced Channel Box for BWR Hydrogen Suppression
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Solution Overview
Problem
Channel boxes in nuclear reactors face challenges in suppressing hydrogen generation due to moisture reactions, and they require a balance between strength, fracture toughness, and fracture energy to withstand accidental loads and thermal shocks without instant failure.
Innovation Solution
A channel box design featuring a layered structure with a silicon carbide first layer for strength, a silicon carbide fiber-reinforced second layer for toughness and energy absorption, and an intermediate solid lubricant layer to weaken bonding and separate the layers, ensuring effective fracture resistance and hydrogen suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional mixing bowl is used, then it can accommodate various mixing tasks, but it requires manual stabilization and cannot securely hold beaters or mixing attachments
Solution Approach 1:
The patent introduces a vertical dimension of stability by adding a central column and base support structure. The mixing bowl transitions from a simple open container to a structured assembly with vertical support elements that extend downward to a base, creating a stable footprint on the countertop and eliminating the need for manual stabilization.
Solution Approach 2:
The patent introduces an intermediary mounting structure consisting of a central column, mounting plate, and securing mechanism. This intermediary structure mediates between the mixing bowl and the beaters/mixing attachments, providing secure mechanical connection and stable operation during mixing tasks.
2Ease of operation
If a mixing bowl with integrated support structure is created, then stability during mixing is improved, but the device becomes more complex and harder to clean
Solution Approach 1:
The patent divides the mixing system into separate, modular components: a removable mixing bowl, a central column, a mounting plate, and a base. This segmentation allows each component to be manufactured independently using standard processes and assembled together, reducing overall manufacturing complexity while maintaining structural stability.
Solution Approach 2:
The patent employs a nested arrangement where the mixing bowl sits on top of the central column, which in turn is mounted on the base. The beaters and mixing attachments nest within the bowl and connect to the mounting structure. This nested design consolidates multiple functions into a compact vertical arrangement without significantly increasing manufacturing complexity.
3Adaptability or versatility
If a multi-functional mixing station is designed, then versatility is improved, but the device occupies more space and becomes more complex
Solution Approach 1:
The patent incorporates a adjustable mounting mechanism that allows the central column to accommodate different types of beaters and mixing attachments. The mounting plate can be adjusted or reconfigured to suit different mixing tasks, providing versatility without requiring multiple separate devices. This dynamic adaptability allows one compact unit to perform multiple functions.
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 layered structure effectively balances strength, fracture toughness, and fracture energy, preventing instantaneous failure under accidental loads and thermal shocks while minimizing hydrogen generation, thus enhancing safety and performance.
Implementation Method 1
a silicon carbide fiber-reinforced second layer for toughness and energy absorption
Implementation Method 2
an intermediate solid lubricant layer to weaken bonding and separate the layers
Implementation Method 3
achieving a balance among strength, fracture toughness, and fracture energy to withstand accidental loads and thermal shocks
Data Source
Figure 1
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AI summary
A channel box in an embodiment provides a channel box suppressing generation of hydrogen due to a reaction with moisture, and achieving a balance among strength, fracture toughness, and fracture energy. The channel box in the embodiment includes a tubular portion. A side wall part of the tubular portion includes a first layer, a second layer, and an intermediate layer. The first layer contains silicon carbide as a major component. The second layer is stacked on the first layer and contains silicon carbide fibers and silicon carbide complexed with the silicon carbide fibers. The intermediate layer is arranged between the first layer and the second layer and has a solid lubricant.