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<p>Ni and NiO are important corrosion-related phases observed in CRUD (Chalk River Unidentified Deposits) formed in PWR primary circuits. To study their dissolution in PWR primary coolant during oxidizing shutdown stage, dissolution experiments were carried out in H<sub>3</sub>BO<sub>3</sub>-H<sub>2</sub>O<sub>2</sub> solutions at 80&#xa0;°C. Acidity plays a key role in dissolution, and the hydrogen ion reaction order was determined to be 0.22 for Ni and 0.28 for NiO. H<sub>2</sub>O<sub>2</sub> might alter the dissolution pathway of Ni by&#xa0;forming NiO/Ni(OH)<sub>2</sub> passivation layer on the Ni powder surface. This research provides key kinetic parameters for understanding their dissolution and optimizing water chemistry strategy during the oxidizing stage of PWR cold shutdown.</p>

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Dissolution behaviors of Ni and NiO in the oxidizing stage during PWR cold shutdown

  • 期刊论文

  • 发表日期：

    2025年10月4日

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  • Zhenyu Jiang,
  • Hengtao Liu,
  • Yuelong Pan,
  • Runcun Guo,
  • Haiying Chen,
  • Weifeng Lv,
  • Mingliang Kang,
  • Danwen Qin

摘要

Ni and NiO are important corrosion-related phases observed in CRUD (Chalk River Unidentified Deposits) formed in PWR primary circuits. To study their dissolution in PWR primary coolant during oxidizing shutdown stage, dissolution experiments were carried out in H3BO3-H2O2 solutions at 80 °C. Acidity plays a key role in dissolution, and the hydrogen ion reaction order was determined to be 0.22 for Ni and 0.28 for NiO. H2O2 might alter the dissolution pathway of Ni by forming NiO/Ni(OH)2 passivation layer on the Ni powder surface. This research provides key kinetic parameters for understanding their dissolution and optimizing water chemistry strategy during the oxidizing stage of PWR cold shutdown.