Liquid Fuel Reactor Control via Inert Gas Displacement
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Solution Overview
Problem
Current nuclear reactors face challenges with complex designs, high pressure systems, mechanical control difficulties in hostile environments, limited fuel life due to gas buildup and radiation damage, and inefficient heat transfer from molten salt fuels.
Innovation Solution
A nuclear reactor design that uses liquids for fuel, neutron absorption, and neutron reflection, where primary liquids are moved by control fluids to control reactivity, with passages and reservoirs to manage gas evolution and heat transfer, allowing for safe, simple, and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high pressure water and steam are used to heat the core, then efficient heat transfer is achieved, but the risk of explosion and nuclear fallout increases
Solution Approach 1:
The patent changes the physical state parameter of the coolant from liquid (high pressure water) to gas (low pressure inert gas), eliminating the explosion risk while maintaining heat transfer capability through controlled gas circulation and heat exchange mechanisms
Solution Approach 2:
The patent replaces reactive high-pressure water with inert low-pressure gas, creating a chemically inert environment that eliminates the risk of explosive reactions while still enabling efficient heat transfer from the nuclear core to the surrounding system
2Reliability
If fuel pellets are sealed inside metal capsules and stacked in tubes, then fuel containment is achieved, but gas build-up limits fuel life and affects reactivity
Solution Approach 1:
The patent extracts the gaseous fission products from the fuel structure by using permeable membranes that allow gases to diffuse out while retaining the fuel particles, preventing pressure build-up and extending fuel life without compromising containment of the fissile material
Solution Approach 2:
The patent employs porous or semi-permeable membrane structures in the fuel element design that selectively allow gaseous fission products to pass through while retaining the solid fuel particles, thereby managing gas build-up and maintaining fuel integrity over extended periods
3Ease of operation
If mechanical control rods are used to control reactivity, then power adjustment is achieved, but mechanical control in hostile nuclear environment becomes difficult
Solution Approach 1:
The patent replaces the mechanical control rod system with a fluid-based or electromagnetic control mechanism that adjusts reactivity by controlling the flow or distribution of neutron-absorbing materials, eliminating complex mechanical moving parts while maintaining precise power adjustment capability
Solution Approach 2:
The patent uses pneumatic or hydraulic systems to control the movement of neutron-absorbing materials or coolant flow rates, providing smooth and precise reactivity control without requiring direct mechanical contact with the hostile nuclear environment
4Temperature
If molten salt fuel is used, then high temperature operation is achieved, but heat transfer from the salt becomes inefficient
Solution Approach 1:
The patent introduces an intermediary heat transfer medium or enhanced heat exchange surface between the molten salt fuel and the coolant system, facilitating efficient thermal energy transfer from the high-temperature salt to the working fluid without requiring direct contact between incompatible materials
Solution Approach 2:
The patent incorporates preliminary heat pre-conditioning zones or pre-heats the coolant before it contacts the molten salt, optimizing the temperature gradient and heat transfer efficiency while protecting downstream components from thermal shock
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 design enhances safety, simplifies operation, reduces fuel needs, and improves heat transfer efficiency, enabling stable and responsive power control without continuous mechanical control, while minimizing pressure and fuel distribution complexities.
Implementation Method 1
A system that moves liquid fuel into and out of a reactor core by moving a control fluid into and out of the core
Implementation Method 2
a liquid being moved (a primary liquid) may be the fuel for a reactor
Implementation Method 3
the fissile fuel is a molten salt and is mixed with a carrier salt
Implementation Method 4
Heat removed from the system causes the temperature to drop
Data Source
AI summary
A nuclear reactor controlled by moving a liquid fuel between a reservoir and chambers in the core is provided. No pumps or moving parts within the reactor vessel are needed to move the fuel. The control system moves the liquid fuel between the core and the reservoir by moving a separate control gas. It can monitor the internal state of the core through the control connections. The fuel chamber is shaped so that evolved gases escape the core and can be collected at the control connections. The core reverts to a safe state on power failure.