{"title":"A control rods position recognition method based capacitance sensing principles within varying liquid level environments","authors":"Yanlin Li, Benke Qin, Hanliang Bo, Wen He","doi":"10.1016/j.nucengdes.2025.113921","DOIUrl":null,"url":null,"abstract":"<div><div>The real-time information of the control rods position should be provided by the rod position indicators. Therefore, the rod position indicators (RPIs) are the pivotal safety-related equipment of the nuclear reactors. According to the operating properties of the 200 MW nuclear reactor (NHR200-Ⅱ), the measuring channel of the RPIs fills with two-phase mediums, as the nitrogen and the water. The liquid level of the measuring channel is affected by the operating temperature of the NHR200-Ⅱ. Based on the coaxial type capacitance RPIs, the impact of the rod position and the liquid level on the output of the indicator are studied separately. The position solving model of the control rods is proposed. Based on the model, the dual-channel capacitance RPIs is designed, and the precision of the indicator is evaluated under the cold state and the ordinary pressure. Results indicate that the maximum error of the indicator is within ±4 mm.</div></div>","PeriodicalId":19170,"journal":{"name":"Nuclear Engineering and Design","volume":"434 ","pages":"Article 113921"},"PeriodicalIF":1.9000,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0029549325000986","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The real-time information of the control rods position should be provided by the rod position indicators. Therefore, the rod position indicators (RPIs) are the pivotal safety-related equipment of the nuclear reactors. According to the operating properties of the 200 MW nuclear reactor (NHR200-Ⅱ), the measuring channel of the RPIs fills with two-phase mediums, as the nitrogen and the water. The liquid level of the measuring channel is affected by the operating temperature of the NHR200-Ⅱ. Based on the coaxial type capacitance RPIs, the impact of the rod position and the liquid level on the output of the indicator are studied separately. The position solving model of the control rods is proposed. Based on the model, the dual-channel capacitance RPIs is designed, and the precision of the indicator is evaluated under the cold state and the ordinary pressure. Results indicate that the maximum error of the indicator is within ±4 mm.
期刊介绍：
Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology.
Fundamentals of Reactor Design include:
• Thermal-Hydraulics and Core Physics
• Safety Analysis, Risk Assessment (PSA)
• Structural and Mechanical Engineering
• Materials Science
• Fuel Behavior and Design
• Structural Plant Design
• Engineering of Reactor Components
• Experiments
Aspects beyond fundamentals of Reactor Design covered:
• Accident Mitigation Measures
• Reactor Control Systems
• Licensing Issues
• Safeguard Engineering
• Economy of Plants
• Reprocessing / Waste Disposal
• Applications of Nuclear Energy
• Maintenance
• Decommissioning
Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.
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