Analysis of Sentitivity of Fission Product Iodine in Containment to Various Factors under Severe Accidents

Hu Wenchao; Pan Xinyi; Zhang Pan; Zhao Chuanqi; Sun Haixu; Yi Yan

doi:10.13832/j.jnpe.2021.05.0182

Volume 42 Issue 5

Sep. 2021

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Hu Wenchao, Pan Xinyi, Zhang Pan, Zhao Chuanqi, Sun Haixu, Yi Yan. Analysis of Sentitivity of Fission Product Iodine in Containment to Various Factors under Severe Accidents[J]. Nuclear Power Engineering, 2021, 42(5): 182-188. doi: 10.13832/j.jnpe.2021.05.0182

Citation:

Hu Wenchao, Pan Xinyi, Zhang Pan, Zhao Chuanqi, Sun Haixu, Yi Yan. Analysis of Sentitivity of Fission Product Iodine in Containment to Various Factors under Severe Accidents[J]. Nuclear Power Engineering, 2021, 42(5): 182-188. doi: 10.13832/j.jnpe.2021.05.0182

Citation:

Hu Wenchao, Pan Xinyi, Zhang Pan, Zhao Chuanqi, Sun Haixu, Yi Yan. Analysis of Sentitivity of Fission Product Iodine in Containment to Various Factors under Severe Accidents[J]. Nuclear Power Engineering, 2021, 42(5): 182-188. doi: 10.13832/j.jnpe.2021.05.0182

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Analysis of Sentitivity of Fission Product Iodine in Containment to Various Factors under Severe Accidents

doi: 10.13832/j.jnpe.2021.05.0182

1.
Nuclear and Radiation Safety Center, Mnistry of Ecology and Environment, Beijing, 100082, China
2.
Harbin Engineering University, Harbin, 100051, China

Received Date: 2020-07-09
Rev Recd Date: 2020-08-13
Publish Date: 2021-09-30

Abstract

Abstract

The most serious consequence of reactor accident is that the radioactive fission products are dispersed into the environment. To study the distribution characteristics of radioactive fission product iodine in the containment under severe accident conditions, this paper assumes that the fission product iodine is released from the primary system into the containment due to the occurrence of severe accident in the nuclear power plant (NPP). Then, using the accident source term evaluation code (ASTEC), this study builds a containment construction model for the NPP, sets the boundary conditions, and calculates the chemical form, chemical properties, distribution, and change trends of different compounds, of the fission product iodine under different pH values, with or without silver (Ag) injection and under gaseous radiation conditions. The results show that the production of volatile iodine in the containment can be inhibited under alkaline conditions; the silver can promote the iodine trap in the liquid phase and reduce the iodine volatility; and the gaseous radiation environment can promote the formation of gaseous CH₃I and IO_x. As a result, this study can provide guidance for the removal of radioactive iodine in the containment under serious accidents.
- ASTEC,
- Severe accident,
- Iodine,
- pH,
- Ag,
- Gaseous radiation

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References(7)

References

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