Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Preliminary importance analyses on model for pH in the presence of organic impurities in the aqueous phase for a severe accident of a nuclear power plant

  • Yoonhee Lee (Department of Quantum System Engineering, Jeonbuk National University) ;
  • Yong Jin Cho (Korea Institute of Nuclear Safety)
  • Received : 2023.07.19
  • Accepted : 2024.01.13
  • Published : 2024.06.25
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Abstract

In this paper, a model is developed for calculating pH in the presence of organic impurities due to dissolution of paint and/or continuous injection of organic impurities in the sump. The model is implemented in the AnCheBi code for the analysis of chemical behaviors of the iodine in the containment when the pH changes during a severe accident. Validation of the model is performed with P10T2 and P11T1 experiments carried out by AECL in Canada under the BIP project. Importance analyses of the pH calculation model in the AnCheBi code are then performed with the aforementioned experimental data via Latin hypercube sampling on the reaction coefficients, sensitivity analyses of AnCheBi, and calculation of the correlation coefficients between the reaction coefficients and figure of merits (the pH and the concentrations of the various iodine species). From the importance analyses, we provide the sensitivity of the pH calculation model to the change of pH and the concentrations of the various iodine species and the reaction coefficients related with the dominant phenomena underlying the change of pH and the concentrations of the species.

Keywords

Acknowledgement

This work was supported by the Nuclear Safety Research Program through the Korea Foundation Of Nuclear Safety (KoFONS) using financial resources granted by the Nuclear Safety and Security Commission (NSSC) of the Republic of Korea (No. 2106007). The authors would like to thank the researchers for providing the experimental results on P10T2 and P11T1 as part of the international cooperative research project BIP. The authors also would like to thank the reviewers for giving very detailed and useful reviews to strengthen the paper.

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