华龙一号核电机组主泵化学去污工艺研究

doi:10.11902/1005.4537.2024.204

中国腐蚀与防护学报

2025, Vol. 45

Issue (3): 739-746 CSTR: 32134.14.1005.4537.2024.204 DOI: 10.11902/1005.4537.2024.204

研究报告

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华龙一号核电机组主泵化学去污工艺研究

张鼎纹¹, 张冀兰¹, 于义军¹, 任科¹, 丁强¹, 史慧梅¹, 杨新辉¹, 王元伟¹, 张雪峰¹, 吴多东¹, 刘锋², 冯兴宇³, 刘朋帅⁴, 匡文军³^,⁴(

)

^1.华能海南昌江核电有限公司昌江 572733
^2.西安热工研究院有限公司西安 710054
^3.华南理工大学材料科学与工程学院广州 510641
^4.西安交通大学材料科学与工程学院西安 710049

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

引用本文:

张鼎纹, 张冀兰, 于义军, 任科, 丁强, 史慧梅, 杨新辉, 王元伟, 张雪峰, 吴多东, 刘锋, 冯兴宇, 刘朋帅, 匡文军. 华龙一号核电机组主泵化学去污工艺研究[J]. 中国腐蚀与防护学报, 2025, 45(3): 739-746.
Dingwen ZHANG, Jilan ZHANG, Yijun YU, Ke REN, Qiang DING, Huimei SHI, Xinhui YANG, Yuanwei WANG, Xuefeng ZHANG, Duodong WU, Feng LIU, Xingyu FENG, Pengshuai LIU, Wenjun KUANG. Chemical Decontamination Process for Main Pump of Hualong One PWR[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 739-746.

全文: PDF(14116 KB) HTML

摘要:

压水堆一回路部件放射性去污是核电站大修期间的重要工序，而部件表面含活化腐蚀产物的有效清除直接关系到检修人员安全。为此，本文针对华龙一号机组压水堆核电站的冷却剂主循环泵材料X3CrNiMo13-4，通过对模拟氧化膜的溶解腐蚀实验，对比分析了溶液组成和工艺参数对氧化物清除效果的影响。同时，结合扫描电子显微镜(SEM)，评价了去污工艺对合金基体的损伤，并优化了去污处理工艺。结果表明，用柠檬酸+ DTPA溶液清洗与酸性高锰酸钾氧化工艺交替进行可实现对氧化膜的有效清除。与碱性高锰酸钾相比，酸性高锰酸钾溶液对材料腐蚀产物的清除效果更好且不会损伤合金基体。

关键词 ：压水堆, 一回路, 氧化物, 去污工艺

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

收稿日期: 2024-07-09 32134.14.1005.4537.2024.204

ZTFLH:

TG174

基金资助:华能集团科技项目(HNKJ21-HF329)

通讯作者: 匡文军，E-mail：20241150@scut.edu.cn，研究方向为核材料环境损伤及新材料研发

Corresponding author: KUANG Wenjun, E-mail: 20241150@scut.edu.cn

作者简介: 张鼎纹，男，1987年生，工程师

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	张鼎纹
	张冀兰
	于义军
	任科
	丁强
	史慧梅
	杨新辉
	王元伟
	张雪峰
	吴多东
	刘锋
	冯兴宇
	刘朋帅
	匡文军
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https://www.jcscp.org/CN/10.11902/1005.4537.2024.204 或 https://www.jcscp.org/CN/Y2025/V45/I3/739

图1 模拟氧化试验样品示意图

表1 化学去污工艺及实施步骤

图2 X3CrNiMo13-4表面氧化膜的SEM图和面扫结果

图3 X3CrNiMo13-4氧化膜横截面形貌

图4 工艺1和2实施前后试样表面形貌和去污处理后溶液颜色变化

图5 工艺3实施过程中试样宏观形貌变化

图6 工艺4实施过程中试样宏观形貌变化

图7 工艺5实施过程中试样宏观形貌变化

图8 工艺6实施过程中试样宏观形貌变化

图9 工艺4和6柠檬酸溶液中Fe离子和Cr离子浓度变化

图10 实施工艺4后材料SEM像

图11 实施工艺4后表面元素信号强度沿深度方向分布

图12 原始试样实施工艺4前后光学显微形貌

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