Method and system for estimating concentration of radioactive iodine species in post-accident containment

By cascading an acid generation and mass transfer model, a pH model, and an iodine water chemistry model, the migration and transformation of iodine within the containment vessel are dynamically simulated. This solves the problem of inaccurate iodine concentration estimation in existing technologies, enables accurate estimation of iodine species concentration after an accident, and improves the reliability of risk prediction and emergency decision-making.

CN120652049BActive Publication Date: 2026-06-23XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Filing Date
2025-06-18
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately assess the concentration of gaseous iodine inside the containment vessel after a serious nuclear power plant accident, leading to an underestimation of the effectiveness of radioactive iodine removal and affecting the credibility of accident consequence assessments and engineering applicability.

Method used

By employing a series of acid generation and mass transfer models, pH models, silver iodide models, and iodine water chemistry models, combined with hydrogen, ozone, and radiolysis reduction coefficients, the physical migration, chemical transformation, and interfacial mass transfer processes of iodine within the containment are dynamically simulated. By iteratively updating the gas/liquid phase iodine concentration and the wall deposition amount, the post-accident iodine species concentration can be accurately estimated.

Benefits of technology

It improves the accuracy of predicting iodine volatilization risks, supports emergency decision-making and the optimized design of iodine removal measures within containment, overcomes the limitations of traditional static models, and provides real-time data support.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a method and system for estimating the concentration of radioactive iodine species in a post-accident containment, inputting the content of gaseous iodine in the containment atmosphere, and calculating the content of acid in the containment wall surface and the pit liquid phase; based on the content of acid in the pit liquid phase and the content of the medicine added to the pit in advance, the pH value of the pit liquid phase is calculated through a pH model; the content of iodine that does not participate in the liquid phase chemical reaction into the pit liquid phase is determined; based on the content of iodine that can undergo chemical reaction in the pool and the pH value, combined with the iodine water chemical equation, the concentration of different iodine species in the liquid phase is calculated through a liquid phase chemical reaction model; the mass transfer amount of gaseous iodine in the gas phase between the containment atmosphere and the pit water is calculated based on a pool mass transfer model; the content of gaseous iodine in the containment atmosphere is calculated through a gaseous iodine radiation and ionization model; the content of iodine deposited on the dry wall surface of the containment is determined based on a gaseous iodine deposition model; and finally, the concentration of each iodine species in the gas-liquid is output.
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