Dynamic Neutron Reflector Assembly for Molten Salt Reactor Control
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Solution Overview
Problem
Current breed-and-burn nuclear reactors face challenges in dynamically controlling reactivity and breed rate over their lifecycle, leading to suboptimal energy production and waste management, particularly in molten salt reactors where neutron spectrum management is complex.
Innovation Solution
A dynamic neutron reflector assembly is introduced, allowing for incremental control of reactivity by adjusting the composition, temperature, and volume of neutron reflector materials, including flowing neutron reflectors that can absorb, moderate, or reflect neutrons, enabling precise management of the neutron spectrum within the reactor core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static neutron reflector assembly is used in a molten salt reactor, then the reactor structure is simple and easy to manufacture, but the reactivity and breed rate cannot be dynamically controlled over the reactor lifecycle
Solution Approach 1:
The patent implements a dynamic neutron reflector assembly where the reflector material can change its properties over time. Specifically, the reflector assembly's composition, temperature, and volume are adjusted dynamically to control reactivity and breed rate at different stages of the reactor lifecycle, transforming a static component into an adaptive one that responds to operational requirements
Solution Approach 2:
The patent controls reactivity by changing key parameters of the neutron reflector assembly including its composition (mixing different reflector materials), temperature (heating or cooling the assembly), and volume (expanding or contracting the reflector). These parameter changes allow dynamic adjustment of neutron reflection characteristics to optimize breeding and power production at different operational phases
2Reliability
If the neutron reflector assembly is made more complex to enable dynamic control, then reactivity management improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The neutron reflector assembly is divided into multiple independent segments or zones that can be controlled separately. This segmentation allows different regions of the reflector to be adjusted independently, providing fine-grained control over neutron reflection patterns and reactivity distribution while maintaining manageable complexity through modular construction
Solution Approach 2:
The neutron reflector assembly is designed to perform multiple functions simultaneously: it reflects neutrons back into the core, serves as a thermal management system through integrated cooling channels, and acts as a structural support element. This multi-functionality reduces the need for separate dedicated components, simplifying overall manufacturing while achieving reliable reactivity control
3Ease of operation
If flowing neutron reflector materials are used to enable dynamic control, then operational flexibility improves, but the system complexity and control difficulty increase
Solution Approach 1:
The patent employs hydraulic or pneumatic systems to control the flow of neutron reflector materials through the reflector assembly. By using fluid pressure to move reflective materials into or out of the core region, the system achieves dynamic reactivity control through a relatively simple and reliable mechanism that avoids complex mechanical actuators or electronic control systems
Solution Approach 2:
The patent replaces complex mechanical control systems with thermal fields to manage the flowing reflector materials. By using temperature gradients and natural convection currents, the system controls material flow and distribution without requiring mechanical pumps or valves, thereby reducing moving parts and control complexity while maintaining operational flexibility
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 solution enables stable and high reactivity rates over extended periods, optimizing fuel breeding and burnup, reducing waste production, and mitigating proliferation risks, while maintaining operational efficiency and safety.
Implementation Method 1
flowing neutron reflectors that can absorb, moderate, or reflect neutrons
Implementation Method 2
flowing neutron reflectors that can absorb, moderate, or reflect neutrons
Implementation Method 3
flowing neutron reflectors that can absorb, moderate, or reflect neutrons
Implementation Method 4
adjusting the composition, temperature, and volume of neutron reflector materials
Implementation Method 5
The flowing neutron reflector material may be in thermal contact with the fuel
Implementation Method 6
The flowing neutron reflector material can extract heat from the molten fuel salt in a heat exchanger
Data Source
AI summary
A molten fuel salt nuclear reactor core assembly including a fluid neutron reflecting material defining a fast spectrum fuel volume configured to breed fissile fuel from fertile fuel, a first inlet channel, and a first outlet channel through which cooled molten fuel salt can enter and heated molten fuel salt can exit the fast spectrum fuel volume. The core assembly also includes a set of neutron absorbing members sized to fit within the fast spectrum fuel volume. The set of neutron absorbing members define a thermal spectrum fuel volume for a fission reaction of the fissile fuel, a second inlet channel, and a second outlet channel through which cooled molten fuel salt can enter and heated molten fuel salt can exit the thermal spectrum fuel volume.