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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (3): 739-746    DOI: 10.11902/1005.4537.2024.204
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Chemical Decontamination Process for Main Pump of Hualong One PWR
ZHANG Dingwen1, ZHANG Jilan1, YU Yijun1, REN Ke1, DING Qiang1, SHI Huimei1, YANG Xinhui1, WANG Yuanwei1, ZHANG Xuefeng1, WU Duodong1, LIU Feng2, FENG Xingyu3, LIU Pengshuai4, KUANG Wenjun3,4()
1.Huaneng Hainan Changjiang Nuclear Power Co., Ltd., Changjiang 572733, China
2.Xi'an Thermal Power Research Institute Co., Ltd., Xi'an 710054, China
3.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
4.School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Cite this article: 

ZHANG Dingwen, ZHANG Jilan, YU Yijun, REN Ke, DING Qiang, SHI Huimei, YANG Xinhui, WANG Yuanwei, ZHANG Xuefeng, WU Duodong, LIU Feng, FENG Xingyu, LIU Pengshuai, KUANG Wenjun. Chemical Decontamination Process for Main Pump of Hualong One PWR. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 739-746.

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Abstract  

The radioactive decontamination of the primary circuit components of the pressurized water reactors (PWRs) is an important process during the overhaul of the nuclear power plant. The effective removal of activated corrosion products on the surface of structural components is directly related to the safety of maintenance personnel. Herein, the X3CrNiMo13-4 steel, used in the main coolant circulating pump of Hualong One PWR, was oxidized in an autoclave to form a pre-oxide scale, as a simulation of the oxide scale formed on its surface in the PWR. Then the influence of the composition of decontamination solution and the process parameter on the removal effectiveness of the simulated oxide scale was compared and analyzed, meanwhile the possible deterioration effect of the decontamination process on the steel matrix was also evaluated using scanning electron microscopy (SEM). The results show that the simulated oxide scale can be effectively removed through alternative treatments of citric acid + DTPA solution cleaning and acidic potassium permanganate oxidation. Compared with alkaline potassium permanganate, the acid potassium permanganate solution has a better removal effect on the corrosion products of the X3CrNiMo13-4 steel without damaging the alloy steel matrix.
Key words:  pressurized water reactors      primary loop      oxide      decontamination process     
Received:  09 July 2024      32134.14.1005.4537.2024.204
ZTFLH:  TG174  
Fund: Technology Project of Huaneng Group(HNKJ21-HF329)
Corresponding Authors:  KUANG Wenjun, E-mail: 20241150@scut.edu.cn
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Articles by authors
ZHANG Dingwen
ZHANG Jilan
YU Yijun
REN Ke
DING Qiang
SHI Huimei
YANG Xinhui
WANG Yuanwei
ZHANG Xuefeng
WU Duodong
LIU Feng
FENG Xingyu
LIU Pengshuai
KUANG Wenjun

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.204     OR     https://www.jcscp.org/EN/Y2025/V45/I3/739

Fig.1  Schematic of the sample used for oxidation test
NumberSolution and implementation timeProcess steps (PS)
12.0% Citric acid + 0.1% Sodium Ascorbate, 24 h-
21.5% Citric acid + 0.5%DTPA + 0.1% Sodium Ascorbate, 24 h-
3①1.5%HNO3 + 1.5%KMnO4, 4 h①→②→①→②→①→②
②1.5% Citric acid + 0.5%DTPA + 0.1% Sodium Ascorbate, 4 h
4①1.5% Citric acid + 0.5%DTPA + 0.1% Sodium Ascorbate, 4 h①→②→①→②→①
②1.5%HNO3 + 1.5%KMnO4, 4 h
5①1.5% Citric acid +0.5%DTPA + 0.1% Sodium Ascorbate, 4 h①→②→①→②→①
②1.5%NaOH + 1.5%KMnO4, 4 h
6①2.0% Citric acid + 0.1% Sodium Ascorbate, 4 h①→②→①→②→①
②1.5%HNO3 + 1.5%KMnO4, 4 h
Table 1  The chemical decontamination process and implementation steps
Fig.2  SEM image of X3CrNiMo13-4 surface oxide film (a) and EDS maps of Fig.2a (b-d)
Fig.3  Cross-sectional morphology of oxide film on X3CrNiMo13-4
Fig.4  Surface morphologies of samples before and after the implementation of process 1 and 2 (a) and color change of solution after decontamination process 1 and 2 (b)
Fig.5  The changes in the macroscopic morphology of sample during the implementation of process 3
Fig.6  The changes in the macroscopic morphology of sample during the implementation of process 4
Fig.7  The changes in the macroscopic morphology of sample during the implementation of process 5
Fig.8  The changes in the macroscopic morphology of samples during the implementation of process 6
Fig.9  The changes in concentrations of Fe (a) and Cr (b) ions in citric acid solutions for process 4 and 6
Fig.10  SEM image after the implementation of process 4
Fig.11  The element distribution in depth direction of the sample surface after the implementation of process 4
Fig.12  The optical microscopic photos of the sample surface before (a) and after (b) the implementation of process 4
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