Filtered Containment Venting System pH Buffering
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Solution Overview
Problem
Conventional filtered containment venting systems face challenges in preventing the decomposition of organic iodine removers and compounds under high-temperature and high-dose radiation conditions, leading to reduced efficiency in collecting organic and inorganic iodine during reactor accidents.
Innovation Solution
A filtered containment venting system incorporating an organic iodine remover and an alkalizing agent to buffer the pH value of scrubbing water, preventing decomposition and enhancing the collection efficiency of both organic and inorganic iodine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pH value of scrubbing water is increased to prevent decomposition of reductant under high-temperature and high-dose radiation, then the stability of reductant is improved, but the decomposition of organic iodine remover is accelerated
Solution Approach 1:
An alkalizing agent is introduced as an intermediary substance that mediates between the scrubbing water and the organic iodine remover. The alkalizing agent buffers the pH value to prevent excessive acidification that would decompose the organic iodine remover, while also preventing the pH from becoming too high to avoid decomposing the reductant. This intermediary buffering system resolves the contradiction by controlling the chemical environment.
Solution Approach 2:
The pH value parameter of the scrubbing water is actively controlled and adjusted through the addition of alkalizing agent. By changing and maintaining the pH within an optimal range, the system prevents decomposition of both the reductant and organic iodine remover under high-temperature and high-dose radiation conditions, resolving the stability contradiction.
2Device complexity
If conventional filtered containment venting systems are used without pH buffering, then the structure remains simple, but the organic iodine remover and reductant decompose under high-temperature and high-dose radiation
Solution Approach 1:
The scrubbing water system is enhanced to provide self-service pH buffering capability through the inclusion of an alkalizing agent. This allows the system to automatically maintain optimal pH conditions without requiring external control mechanisms or complex monitoring systems, thus preserving structural simplicity while improving reliability.
Solution Approach 2:
The scrubbing water is transformed into a composite chemical system comprising water, reductant, and alkalizing agent working together. This composite formulation provides both the reducing function and pH buffering function within a single integrated medium, maintaining system simplicity while enhancing the reliability of radioactive material collection under extreme 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 prevents the decomposition of organic iodine removers and compounds, maintaining high performance in collecting organic and inorganic iodine, even under extreme conditions, thereby ensuring effective radioactive material containment.
Implementation Method 1
an alkalizing agent for adding an action of buffering a pH value to the scrubbing water
Implementation Method 2
an organic-iodine remover such as silver zeolite and activated carbon
Implementation Method 3
ionized inorganic iodine (elemental iodine) and aerosols are dissolved into the scrubbing water
Implementation Method 4
By reaction with the chemical solution, ionized inorganic iodine (elemental iodine) and aerosols are dissolved into the scrubbing water
Implementation Method 5
a part of aerosols discharged through the scrubbing water to a gas phase adheres to or collides with, and then collected by, the fiber filter
Data Source
AI summary
A filtered containment venting system includes a filtered containment venting tank having: an organic iodine remover for collecting organic iodine; scrubbing water for collecting inorganic iodine; and an alkalizing agent for adding an action of buffering a pH value to the scrubbing water.