Fuel Component with Gradient Intermediate Layer
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Solution Overview
Problem
Fuel components in nuclear reactors face challenges with neutron absorber layers peeling off due to thermal stress, leading to power fluctuations and potential reactor shutdowns, and contamination risks from interactions with the outer surrounding, resulting in costly maintenance and energy losses.
Innovation Solution
A fuel component design featuring an intermediate layer with a material gradient between the fissile core and a neutron-absorbing layer, providing strong adhesion and reducing thermal stresses, while also being impermeable and corrosion-resistant to prevent gas escape and contamination, potentially reducing the thickness of cladding tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a layer of neutron absorbing material is applied on the surface of the fuel component, then the produced power can be limited during the first fuel cycle, but the layer can crack, peel off, or be abraded due to thermal stresses during irradiation
Solution Approach 1:
The patent applies a layer of neutron absorbing material on the surface of the fuel component, creating a localized region with different properties (higher neutron absorption) at the surface compared to the core. This allows power limitation during the first fuel cycle while maintaining the bulk fuel composition for subsequent cycles.
Solution Approach 2:
The fuel component is structured as a composite with a core material (fuel pellets) and a surface layer (neutron absorbing material). This composite structure combines the energy-generating properties of the fuel core with the power-limiting properties of the neutron-absorbing surface layer, resolving the contradiction between power control and layer stability.
2Object-affected harmful factors
If the cladding tube thickness is increased to prevent contamination, then the protection against interaction with outer surrounding is improved, but the reactor efficiency decreases due to increased neutron absorption
Solution Approach 1:
The patent changes the material composition parameter of the fuel component by incorporating neutron-absorbing materials in specific concentrations and configurations. This allows for optimized cladding tube thickness that provides adequate protection while minimizing neutron absorption losses, thereby maintaining reactor efficiency.
Solution Approach 2:
The neutron-absorbing material is concentrated in specific regions (surface layers or localized zones) rather than being uniformly distributed throughout the entire fuel component. This localized approach provides effective contamination protection while minimizing the overall neutron absorption that would reduce reactor efficiency.
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 material gradient ensures a stable neutron-absorbing layer that maintains power control and prevents contamination, enhancing reactor safety and efficiency by reducing the need for premature fuel element replacement and minimizing exposure to irradiation.
Implementation Method 1
During irradiation of the fuel element high temperatures arises in the fuel component. For example in boiling water reactors and pressurized water reactors temperatures of up to 1500°C arises in the fuel component during normal operational conditions. The transition from room temperature to high temperatures between the fuel cycles creates stresses between material with different thermal and elastic properties
Implementation Method 2
In order to limit the produced power neutron absorbers are used, which absorb neutrons. Thereby, the fission process is mitigated and the produced power is reduced
Implementation Method 3
Fuel components with neutron absorbers can be manufactured by either mixing neutron absorbing material into the fuel component or by applying the neutron absorbing material as a layer on the surface of the fuel component
Data Source
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AI summary
The invention relates to a fuel component (1) and a method for manufacturing of a fuel component (1). The fuel component (1) is adapted to be used in fission reactors. The fuel component (1) comprises a core (2) consisting of a first material, and a layer (3) consisting of a second material. The layer (3) encloses at least partly the core (2). The first material comprises a fissile substance. The fuel component (1) comprises an intermediate layer (4) between the core (2) and the layer (3). The intermediate layer (4) has a material gradient that comprises a decrease of the concentration of the first material from the core (2) to the layer (3) and an increase of the concentration of the second material from the core (2) to the layer (3).