Nuclear Fuel Assembly Hydrogen to Uranium Ratio Optimization
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Solution Overview
Problem
Nuclear reactors face challenges in minimizing the frequency and cost of refueling and maintenance due to the depletion of fissile material, which requires optimizing the fission chain reaction and neutron moderation to maintain efficient energy generation.
Innovation Solution
A nuclear fuel assembly for pressurized water reactors with a hydrogen to uranium ratio greater than 4.0, optimized for 24-month fuel cycles, incorporating annular fuel pellets and advanced cladding to enhance energy extraction and reduce uranium requirements, while maintaining safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fuel assemblies are used with standard hydrogen to uranium ratio, then refueling frequency is maintained at traditional intervals, but energy extraction per unit mass of fissile material is limited
Solution Approach 1:
The patent applies parameter changes by modifying the hydrogen to uranium ratio in the fuel assembly from conventional values to greater than 4.0. This parameter change optimizes neutron moderation and fission chain reaction efficiency, enabling extended burnup periods and increased energy extraction per unit mass of fissile material, thereby resolving the contradiction between productivity and time loss.
2Duration of action of stationary object
If fissile material inventory is depleted to extend fuel cycle life, then refueling frequency is reduced, but maintenance operations become more complex and costly
Solution Approach 1:
By changing the hydrogen to uranium ratio parameter to greater than 4.0, the fuel assembly achieves optimized neutron economy that extends fuel cycle life to 24 months. This parameter optimization allows for longer operational periods between refueling, reducing the frequency and complexity of maintenance operations while maximizing the utilization of fissile material.
3Quantity of substance
If higher burnup is achieved through optimized fission chain reaction, then energy density increases, but safety protocols and temperature control become more challenging
Solution Approach 1:
The patent utilizes parameter changes in the hydrogen to uranium ratio to optimize neutron moderation, which enhances fission chain reaction efficiency and increases energy density. The optimized ratio facilitates better heat distribution and temperature control mechanisms, allowing higher burnup levels while maintaining safety protocols and preventing excessive temperature rise.
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
This configuration allows for increased energy extraction from a given mass of fissile material, reducing the need for frequent refueling and lowering operational costs by extending the time between refueling cycles and optimizing fuel burnup.
Implementation Method 1
the free neutrons produced by fission of the fissile material contribute to the generation of energy by sustaining a fission chain reaction
Implementation Method 2
the free neutrons produced by fission of the fissile material contribute to the generation of energy
Data Source
AI summary
Provided herein is a nuclear fuel assembly for a pressurized water reactor. The nuclear fuel assembly comprises: a plurality of nuclear fuel rods configured to contain a fissile material, wherein the nuclear fuel assembly is configured such that a hydrogen to uranium ratio for the fuel assembly, when coolant and the fissile material are present under operating conditions, is at least 4.0. Also provided herein is a method for refueling a pressurized water nuclear reactor comprising a nuclear fuel assembly of the present disclosure.