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

By combining the acid generation and mass transfer model, pH model and iodine water chemical model, the migration and transformation of iodine in the containment are dynamically simulated, which solves the problem of inaccurate iodine concentration estimation in existing technologies and improves the credibility and engineering applicability of accident consequence assessment.

CN120652049AActive Publication Date: 2025-09-16XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202510818445.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-09-16
Estimated Expiration
2045-06-18

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately assess the concentration of gaseous iodine in the containment after a serious accident in a nuclear power plant, resulting in an underestimated effect of radioactive iodine removal, affecting the credibility of accident consequence assessments and engineering applicability.

Method used

By connecting the acid generation and mass transfer model, pH model, iodine-silver model and iodine-water chemical model in series, combined with hydrogen, ozone and radiolysis reduction coefficients, the physical migration, chemical transformation and interfacial mass transfer processes of iodine in the containment are dynamically simulated. By iteratively updating the gas/liquid phase iodine concentration and wall deposition, continuous prediction of the time-varying behavior after the accident is achieved.

Benefits of technology

It improves the prediction accuracy of iodine volatilization risk, supports the optimized design of iodine removal measures in the containment, provides real-time data support, and provides a reliable basis for emergency decision-making.

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Abstract

The invention discloses a method and system for estimating the concentration of radioactive iodine species in a containment after an accident, and the method comprises the steps: inputting the content of gaseous iodine in the atmosphere of the containment, and calculating the acid content in the wall surface of the containment and the liquid phase of a pit; on the basis of the content of acid in the pit liquid phase and the content of a medicine added into the pit in advance, the pH value in the pit liquid phase is calculated through a pH model; determining the content of iodine which enters the liquid phase of the pit and does not participate in the chemical reaction of the liquid phase; on the basis of the content and the pH value of iodine which can be subjected to chemical reaction in the pool, combining an iodine water chemical equation, and calculating through a liquid phase chemical reaction model to obtain the concentrations of different iodine species in a liquid phase; calculating the mass transfer amount of gaseous iodine in the gas phase between the containment atmosphere and the pit water based on a pool mass transfer model; the content of gaseous iodine in the containment atmosphere is calculated through a gaseous iodine radiolysis and ionization model; determining the content of iodine deposited on the dry wall surface of the containment based on a gaseous iodine deposition model; and finally outputting the concentration of each iodine species in the gas liquid.
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