Iodine Filter Leak Testing with Fluorine Reagent
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current leak testing methods for iodine filters, such as using Freon-112 or methyl iodide, face issues like ozone depletion, irreversible collection of non-radioactive methyl iodide, and inaccurate testing due to high moisture levels, which compromise the collection capacity and accuracy of radioactive iodine removal.
Innovation Solution
A leak testing method and device utilizing a fluorine-containing reagent with a boiling point of 70°C or higher, such as compounds like C6F13OCH3, CF3(CF2)5CH2CH3(C3F13H5), and (CH2CHFCF2CF2CF2), to detect leaks in iodine filters without decreasing their collection capacity, by measuring the reagent's concentration on both sides of the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Freon-112 is used for leak testing, then the leak detection can be performed, but it causes ozone depletion
Solution Approach 1:
The patent changes the chemical composition parameters of the testing agent from chlorine-containing Freon-112 to fluorine-containing compounds without chlorine, thereby maintaining leak detection capability while eliminating ozone depletion harm
Solution Approach 2:
The patent converts the harmful chlorine-containing compound into a beneficial fluorine-containing compound that provides the same detection function without environmental harm, turning a harmful testing method into an environmentally friendly one
2Measurement precision
If non-radioactive methyl iodide is introduced for leak testing, then the leak rate can be measured, but the collection capacity of the iodine filter decreases
Solution Approach 1:
The patent introduces fluorine-containing compounds as intermediary testing agents that do not interact with the activated carbon in the iodine filter, unlike methyl iodide which is irreversibly collected, thereby maintaining both measurement precision and filter collection capacity
Solution Approach 2:
The patent uses fluorine-containing compounds that are not permanently retained by the filter media, allowing them to pass through or be detected without depleting the filter's long-term collection capacity for radioactive iodine
3Reliability
If heavy water vapor is introduced for leak testing, then leakage can be detected, but accurate testing becomes difficult when moisture in air is high
Solution Approach 1:
The patent changes the physical state and chemical properties of the testing agent from heavy water vapor to fluorine-containing compounds with higher boiling points, which are less affected by ambient moisture conditions, thereby maintaining detection reliability and improving measurement precision across varying humidity levels
4Ease of operation
If a fluorine-containing reagent with low boiling point is used, then the testing can be performed, but the breakthrough time becomes short
Solution Approach 1:
The patent optimizes the boiling point parameter of the fluorine-containing reagent to be 70°C or higher, which balances ease of vaporization for testing performance with sufficient residence time in the system to maintain adequate breakthrough time for accurate measurement
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 approach maintains a long breakthrough time and allows for accurate leak rate testing of radioactive iodine, similar to conventional methods, while minimizing the decrease in iodine filter collection capacity and avoiding contamination, enabling reliable detection of leaks without affecting the filter's performance.
Implementation Method 1
an iodine filter removing radioactive iodine contained in gas to be treated by an iodine adsorbing material
Data Source
AI summary
A leak testing device 10 for an iodine filter according to the present embodiment includes an iodine adsorption unit 14 including an iodine filter provided in a chamber 13 provided in a duct 12, to which flue gas 11 containing radioactive iodine is fed, and including an iodine adsorbing material 24 that adsorbs radioactive iodine contained in the flue gas 11, a fluorine-containing-reagent feed unit 15 that feeds a fluorine-containing reagent 30 that does not contain chlorine into the duct 12, and a first fluorine-containing-reagent-concentration measurement unit 16 and a second fluorine-containing-reagent-concentration measurement unit 17 that measures a concentration of the fluorine-containing reagent 30 on an upstream side and a downstream side of the iodine filter 20.