Study on Efficient Eddy Current Testing Method for Reactor Pressure Tube Spacing Based on Parameter Inversion

HAN Jie; CHEN Zhen-mao; CHEN Xing-le

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Study on Efficient Eddy Current Testing Method for Reactor Pressure Tube Spacing Based on Parameter Inversion

更新时间：2025-11-18

- Study on Efficient Eddy Current Testing Method for Reactor Pressure Tube Spacing Based on Parameter Inversion
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2025)
- 作者机构：
  
  1.核动力运行研究所,430074
  2.西安交通大学航天航空学院,陕西省西安市710049
  3.北京航空航天大学自动化工程与电气工程学院,北京市北京市100191
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG115.28
- Received：19 August 2025，
  
  Revised：2025-10-11，
  
  Accepted：15 October 2025，
- 稿件说明：
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HAN Jie, CHEN Zhen-mao, CHEN Xing-le. Study on Efficient Eddy Current Testing Method for Reactor Pressure Tube Spacing Based on Parameter Inversion[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025.
DOI：

HAN Jie, CHEN Zhen-mao, CHEN Xing-le. Study on Efficient Eddy Current Testing Method for Reactor Pressure Tube Spacing Based on Parameter Inversion[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025. DOI：

摘要

针对核电站重水反应堆压力管间距难以进行高效检测的问题，提出了一种基于参数反演的套管间距脉冲涡流检测方法，可用于重水堆压力管-排管、排管-停堆系统液体注入（LISS）管之间的间距检测，只需采用一种脉冲涡流检测法即可完成两类不同对象的间距检测。首先，基于双层套管建立脉冲涡流检测模型，采用最小二乘法进行参数反演；然后，利用数值迭代算法求解双层套管间距问题，得到参数反演结果，反演结果中的套管间距可直接用于检测压力管-排管的间距变化；接着，通过实验标定，拟合得到反演结果中外层排管的壁厚与排管-LISS管间距之间的指数函数关系；最后，利用该函数关系间接确定排管-LISS管之间的间距。实验结果表明：基于参数反演的压力管-排管间距检测误差可控制在±0.5 mm以内，排管-LISS管的间距检测误差可控制在±1.1 mm以内。检测结果能够满足反应堆压力管现场检测压力管-排管间距误差为±1 mm、排管-LISS间距误差为±2 mm的精度要求，可为压力管道的安全状态评估与风险管理提供可靠的决策依据。

Abstract

To address the challenge of efficient detection of pressure tube spacing in heavy water reactors (HWRs) of nuclear power plants

this paper proposes a pulsed eddy current testing method for casing spacing based on parameter inversion. This method is applicable to detecting the spacing between the pressure tube and calandria tube

as well as between the calandria tube and the liquid injection shutdown system (LISS) tube in HWRs. During the detection process

only one type of pulsed eddy current testing method is required to complete the spacing detection for these two distinct sets of objects. Firstly

a pulsed eddy current testing model was established based on the double-layer casing structure

and parameter inversion was performed using the least square method. Secondly

a numerical iterative algorithm is utilized

and its implementation determines the inter-layer spacing of the double-layer casing

obtaining parameter inversion results; the casing spacing in these results can be directly used to detect the spacing variation between the pressure tube and calandria tube. Then

through experimental calibration

an exponential function relationship was fitted between the wall thickness of the outer calandria tube (derived from the inversion results) and the spacing between the calandria tube and LISS tube. Finally

this functional relationship was used to indirectly determine the spacing between the calandria tube and LISS tube. Test results show that the detection error of the pressure tube-calandria tube spacing based on parameter inversion is within ±0.5 mm

and the detection error of the calandria tube-LISS tube spacing is within ±1.1 mm. The detection results meet the accuracy requirements for on-site detection of reactor pressure tubes

where the allowable error for pressure tube-calandria tube spacing is ±1 mm and for calandria tube-LISS tube spacing is ±2 mm

and can provide a reliable basis for decision-making for the safety assessment and risk management of pressure tubes.

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