Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor
Under some unexpected conditions, drive rods and control-rod assemblies may not be disconnected. If this situation is not detected, the control rod will be lifted out of the reactor core together with the upper reactor internals. This situation will seriously affect the follow-up work and reduce the...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/22/8805 |
| _version_ | 1797463976687173632 |
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| author | Zhi Li Jianqiang Hu Zhangxiang Zhou Jin Wang Xianen Zhou Qing Zhu Shaonan Chen Yaonan Wang |
| author_facet | Zhi Li Jianqiang Hu Zhangxiang Zhou Jin Wang Xianen Zhou Qing Zhu Shaonan Chen Yaonan Wang |
| author_sort | Zhi Li |
| collection | DOAJ |
| description | Under some unexpected conditions, drive rods and control-rod assemblies may not be disconnected. If this situation is not detected, the control rod will be lifted out of the reactor core together with the upper reactor internals. This situation will seriously affect the follow-up work and reduce the economy and safety protection of the nuclear power plant. To ensure safety, the tripping status must be checked after tripping. Follow-up work can be carried out after checking and confirming that all drive rods are in the tripping status. There are many problems for traditional inspection methods, such as misjudgment, low accuracy, and labor consumption. This paper proposes a visual inspection system for the uncoupling state of the control-rod drive rod of the nuclear reactor. The proposed method is based on the fitting model of the ellipse parameter of the drive-rod head and the height of the drive rod. The ellipse of the drive-rod head is firstly accurately detected. Then, a mathematical model between the ellipse parameter and the height of the drive rod is established. The measurement error caused by the swing of the head of the drive rod is eliminated. The accurate measurement of the height difference before and after the tripping of the drive rod is computed. Finally, the status of the uncoupling of the drive rod is judged according to the difference. Many experiments are carried out with our developed system. The experimental results show that the proposed system realizes remote operation, ensures the quality of trip-status inspection, improves work efficiency, and reduces the workload of staff. |
| first_indexed | 2024-03-09T18:01:20Z |
| format | Article |
| id | doaj.art-b917f54883704791b0ef24a6a0bf6d0f |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T18:01:20Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-b917f54883704791b0ef24a6a0bf6d0f2023-11-24T09:56:04ZengMDPI AGSensors1424-82202022-11-012222880510.3390/s22228805Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear ReactorZhi Li0Jianqiang Hu1Zhangxiang Zhou2Jin Wang3Xianen Zhou4Qing Zhu5Shaonan Chen6Yaonan Wang7China Nuclear Power Technology Research Institute Co., Ltd., Shenzhen 518000, ChinaChina Nuclear Power Operations Co., Ltd., Shenzhen 518000, ChinaChina Nuclear Power Operations Co., Ltd., Shenzhen 518000, ChinaNational Engineering Research Center for Robot Visual Perception and Control Technology, Hunan University, Changsha 410082, ChinaNational Engineering Research Center for Robot Visual Perception and Control Technology, Hunan University, Changsha 410082, ChinaNational Engineering Research Center for Robot Visual Perception and Control Technology, Hunan University, Changsha 410082, ChinaChina Nuclear Power Technology Research Institute Co., Ltd., Shenzhen 518000, ChinaNational Engineering Research Center for Robot Visual Perception and Control Technology, Hunan University, Changsha 410082, ChinaUnder some unexpected conditions, drive rods and control-rod assemblies may not be disconnected. If this situation is not detected, the control rod will be lifted out of the reactor core together with the upper reactor internals. This situation will seriously affect the follow-up work and reduce the economy and safety protection of the nuclear power plant. To ensure safety, the tripping status must be checked after tripping. Follow-up work can be carried out after checking and confirming that all drive rods are in the tripping status. There are many problems for traditional inspection methods, such as misjudgment, low accuracy, and labor consumption. This paper proposes a visual inspection system for the uncoupling state of the control-rod drive rod of the nuclear reactor. The proposed method is based on the fitting model of the ellipse parameter of the drive-rod head and the height of the drive rod. The ellipse of the drive-rod head is firstly accurately detected. Then, a mathematical model between the ellipse parameter and the height of the drive rod is established. The measurement error caused by the swing of the head of the drive rod is eliminated. The accurate measurement of the height difference before and after the tripping of the drive rod is computed. Finally, the status of the uncoupling of the drive rod is judged according to the difference. Many experiments are carried out with our developed system. The experimental results show that the proposed system realizes remote operation, ensures the quality of trip-status inspection, improves work efficiency, and reduces the workload of staff.https://www.mdpi.com/1424-8220/22/22/8805drive roddisconnection detectiondisplacement measurementellipse detectionfitting |
| spellingShingle | Zhi Li Jianqiang Hu Zhangxiang Zhou Jin Wang Xianen Zhou Qing Zhu Shaonan Chen Yaonan Wang Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor Sensors drive rod disconnection detection displacement measurement ellipse detection fitting |
| title | Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor |
| title_full | Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor |
| title_fullStr | Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor |
| title_full_unstemmed | Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor |
| title_short | Visual Inspection System for Uncoupling Status of Control-Rod Drive Rod in Nuclear Reactor |
| title_sort | visual inspection system for uncoupling status of control rod drive rod in nuclear reactor |
| topic | drive rod disconnection detection displacement measurement ellipse detection fitting |
| url | https://www.mdpi.com/1424-8220/22/22/8805 |
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