Molten Salt Sampling Tank Pressure Control for Stable Fluid Levels
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Solution Overview
Problem
Conventional molten salt reactors (MSRs) face challenges in accessing nuclear fuel and other fluids without shutting down the reactor for experimental purposes like materials testing and metrology, necessitating an effective fluid level control system.
Innovation Solution
A method and system using pressure transducers, level sensors, and electronic proportional regulators to control fluid levels in an experimental tank by calculating set pressures and circulating fluid among tanks, with an inert gas system to maintain desired fluid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional MSR designs are used, then reactor safety is maintained, but access to nuclear fuel and fluids requires shutdowns
Solution Approach 1:
The system divides the MSR into separate functional zones: an experimental tank for fuel sampling, a sump tank for fluid collection, and a drain tank for waste fluid. This segmentation allows the experimental tank to be accessed independently without shutting down the entire reactor, enabling continuous operation while maintaining safety.
Solution Approach 2:
The sump tank acts as an intermediary between the experimental tank and the drain tank, providing a buffer zone that allows fluid transfer without direct exposure to the reactor core. This intermediary structure enables safe access to nuclear fuel while maintaining reactor integrity during operation.
2Measurement precision
If fluid level is not controlled in experimental tank, then system complexity is reduced, but experimental accuracy deteriorates
Solution Approach 1:
Pressure transducers continuously monitor the headspace pressure in each tank, and level sensors detect fluid levels. This feedback information is used by the control system to automatically adjust fluid transfer operations, maintaining precise control of fluid levels in the experimental tank without requiring complex manual intervention.
Solution Approach 2:
The system replaces complex mechanical level control mechanisms with pressure-based control. By monitoring headspace pressure and using electronic proportional regulators to control inert gas flow, the system achieves precise fluid level control without complex mechanical linkages or moving parts.
3Manufacturing precision
If inert gas system is added to control fluid levels, then fluid level precision is improved, but system complexity increases
Solution Approach 1:
The system controls fluid levels by changing the pressure parameter in the headspace of each tank. Electronic proportional regulators adjust inert gas flow to maintain target pressures, which directly controls fluid levels through the hydrostatic pressure relationship. This parameter-based control achieves precise fluid level management with relatively simple equipment.
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
Enables continuous monitoring and control of fluid levels in MSRs, allowing experimental access without shutdowns, ensuring precise fluid management and safety.
Implementation Method 1
determining an initial pressure of a headspace of an experimental tank using a first pressure transducer
Implementation Method 2
operating an inert gas system configured to deliver and to receive an inert gas from each of the headspace of the experimental tank, the headspace of the sump tank, and the headspace of the drain tank
Implementation Method 3
causing the fluid to circulate through the fluid circuit and among the experimental tank, the sump tank, and the drain tank
Data Source
AI summary
A molten fuel salt reactor system includes a fluid level control system configured to circulate a molten salt through a molten salt loop including an experimental tank, a sump tank, and a drain tank. The fluid level control system further includes a plurality of level sensors, pressure transducers, and electronic pressure regulators fluidically coupled with the fuel salt reactor system. The fluid level control system is configured to receive cover gas pressures in the headspaces of the tanks and calculate target fluid height setpoints for each of the tanks. The fluid level control system further invokes the electronic pressure regulator to iteratively adjust the cover gas pressures of the tanks to achieve and maintain a target fluid level in the experimental tank.