Passive Radioactive Material Capture Filter with Pressure-Absorbing Media
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Solution Overview
Problem
Current systems for radioactive material capture in nuclear power plants are inefficient, require operator intervention, and have high maintenance costs, with limitations in changing the decontamination factor (DF) and susceptibility to blockages, especially during severe nuclear accidents.
Innovation Solution
A passive system for radioactive material capture that includes particulate, water, and radionuclide removal devices using engineered filter media, such as activated alumina and charcoal, arranged in sequence to mechanically remove particulates and water, and filter radioactive aerosols and gases, with features to reduce thermophoretic forces and absorb pressure increases, allowing for independent operation without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active systems with pumps and cooling are used for radioactive material capture, then the decontamination factor can be maintained, but the system requires operator intervention and has high maintenance costs
Solution Approach 1:
The filter system is designed to operate passively using natural forces (pressure differential, thermophoresis, gravity) without requiring pumps, external cooling, or operator intervention. The system serves itself by utilizing the inherent properties of the gas flow and filter media to achieve decontamination, thereby eliminating the need for active control systems and reducing maintenance requirements
2Reliability
If charcoal adsorption beds are used to capture radioactive materials, then the decontamination factor is improved, but the system is susceptible to blockages and requires water removal prior to filtration
Solution Approach 1:
The system changes the physical parameters of the gas flow by utilizing thermophoresis (temperature gradient-driven particle movement) to separate particulates from the gas stream before they reach the charcoal adsorption beds. This parameter change prevents blockages while maintaining the decontamination function of the charcoal beds
3Reliability
If engineered filter media are used to remove radioactive aerosols and gases, then the decontamination factor is improved, but thermophoretic forces can cause blockages
Solution Approach 1:
The system converts the potentially harmful thermophoretic forces (which could cause blockages) into a beneficial separation mechanism. By strategically positioning filter media and utilizing temperature gradients, the thermophoresis effect is harnessed to direct particulates away from critical filtration zones, preventing blockages while maintaining effective decontamination
4Reliability
If pressure increases occur during severe nuclear accidents, then the system must handle elevated pressures, but this can compromise system integrity and release radioactive materials
Solution Approach 1:
The system incorporates pressure-absorbing features and robust filter housing designs that can withstand pressure increases before they compromise system integrity. These pre-designed pressure management capabilities cushion against pressure surges, preventing catastrophic failures and radioactive material release during severe accident conditions
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
The system effectively captures radioactive materials, reduces thermophoretic forces, and absorbs pressure increases, enabling efficient and independent operation during severe nuclear accidents, overcoming the limitations of existing systems by improving DF and reducing maintenance costs.
Implementation Method 1
removing radioactive aerosols and reactive radioactive gases from the flow using filter media
Implementation Method 2
mixing of the flow may reduce thermophoretic forces within the flow
Implementation Method 3
allowing the stored filter media to move toward the outlet when pressure at the inlet increases
Data Source
AI summary
A system configured to passively filter radioactive materials from a flow may include one or more particulate removal devices; one or more water removal devices; and/or one or more radionuclide removal devices. At least one of the one or more particulate removal devices may mechanically remove particulates of the radioactive materials from the flow. At least one of the one or more water removal devices mechanically may remove water from the flow. At least one of the one or more radionuclide removal devices may remove radioactive aerosols, reactive radioactive gases, or radioactive aerosols and reactive radioactive gases from the flow using engineered filter media. A filter may include a body, including an inlet and an outlet. The body may be configured to store filter media, to contain pressure from gas explosions, and/or to allow the stored filter media to move toward the outlet when pressure at the inlet increases.