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Volume 44 Issue 3
Jun.  2023
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Li Fuhai, Lin Yunliang, Lin Zijian, Lin Genxian, Guo Zifang, Fang Jun, Lin Mingzhang. Research on Calculation of Coolant Radiolysis Products in Operating Conditions during the Shutdown of PWRs[J]. Nuclear Power Engineering, 2023, 44(3): 202-209. doi: 10.13832/j.jnpe.2023.03.0202
Citation: Li Fuhai, Lin Yunliang, Lin Zijian, Lin Genxian, Guo Zifang, Fang Jun, Lin Mingzhang. Research on Calculation of Coolant Radiolysis Products in Operating Conditions during the Shutdown of PWRs[J]. Nuclear Power Engineering, 2023, 44(3): 202-209. doi: 10.13832/j.jnpe.2023.03.0202

Research on Calculation of Coolant Radiolysis Products in Operating Conditions during the Shutdown of PWRs

doi: 10.13832/j.jnpe.2023.03.0202
  • Received Date: 2022-07-05
  • Rev Recd Date: 2023-04-13
  • Publish Date: 2023-06-15
  • The control of radioactive source of the activated corrosion products during the shutdown of PWRs is one of the most effective means to reduce the CRE. The effect of coolant radiolysis should be taken into account. In this paper, a coolant radiolysis kinetic model was developed based on water radiolysis reaction kinetics. The main radiolysis products such as H2O2, O2 and H2 under different conditions were obtained through the kinetic calculations. The reaction mechanism was also discussed. The results showed that: ① during the shutdown, as the temperature of coolant decreases from 310℃ to 60℃, and the concentration of dissolved H2 decreased to 0, the coolant changes from reductive to oxidative. The radiolysis generation of H2O2 and O2 is significantly promoted;② the generation of radiolysis products is affected by the chemical parameters, such as concentrations of B/Li, dissolved H2, dissolved O2 and H2O2; ③ the generation of H2O2 and O2 are mutually promoted by each other. The presence of H2 can inhibit the generation of H2O2 and O2 to some extent. The presence of high concentration of H2O2 will protect H2 from the consumption of ·OH. The results in this paper may provide important references and guidances for the selection of operating parameters under different conditions during the shutdown of PWRs and the control of activated corrosion products.

     

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