Nuclear Reactor Flow Control Assembly for Traveling Burn Wave Management
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Solution Overview
Problem
Nuclear fission reactors face challenges in managing coolant flow due to differential thermal expansion and fuel rod swelling, leading to potential fuel pellet cracking and increased radiation levels, which can result in coolant flow obstructions and safety risks.
Innovation Solution
A flow control assembly system that includes an adjustable flow regulator subassembly with a first sleeve and a second sleeve, where the second sleeve has holes alignable with the first sleeve, allowing for variable coolant flow based on the alignment of these holes, and a carriage subassembly to adjust the flow regulator, ensuring optimal coolant distribution in response to the location of a traveling burn wave within the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coolant flow is increased to prevent fuel rod damage, then fuel rod safety is improved, but reactor power distribution control becomes more difficult
Solution Approach 1:
The flow control assembly uses movable flow control members that can dynamically adjust coolant flow rates in response to burn wave position and reactor conditions. This dynamic adjustment allows the system to optimize both fuel rod safety and power distribution control by adapting flow rates to changing thermal and operational conditions.
Solution Approach 2:
The system implements localized flow control by independently adjusting coolant flow to specific fuel assemblies or regions based on local thermal conditions and burn wave position. This allows different regions of the reactor to receive appropriate coolant flow rates tailored to their specific operational requirements, balancing safety and control.
2Ease of operation
If flow control mechanisms are added to manage coolant flow, then coolant flow control is improved, but device complexity increases
Solution Approach 1:
The flow control assembly is divided into modular components including flow control members, guide structures, and mounting mechanisms that can be independently designed, manufactured, and maintained. This segmentation reduces overall system complexity by allowing each component to be optimized separately while working together to achieve effective coolant flow control.
Solution Approach 2:
The flow control assembly is designed to perform multiple functions including coolant flow regulation, thermal management, and power distribution control within a single integrated structure. This multi-functionality reduces the need for separate systems and minimizes overall device complexity while achieving comprehensive flow control capabilities.
Data Source
AI summary
A nuclear fission reactor, flow control assembly, methods therefor and a flow control assembly system. The flow control assembly is coupled to a nuclear fission module capable of producing a traveling burn wave at a location relative to the nuclear fission module. The flow control assembly controls flow of a fluid in response to the location relative to the nuclear fission module. The flow control assembly comprises a flow regulator subassembly configured to be operated according to an operating parameter associated with the nuclear fission module. In addition, the flow regulator subassembly is reconfigurable according to a predetermined input to the flow regulator subassembly. Moreover, the flow control assembly comprises a carriage subassembly coupled to the flow regulator subassembly for adjusting the flow regulator subassembly to vary fluid flow into the nuclear fission module.