• Title/Summary/Keyword: 핵연료 프레팅

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Experimental Analysis of Fretting Wear Behaviors in Elastic Deformable Contacts (탄성변형 접촉에서 프레팅 마멸거동의 실험적 분석)

  • Lee, Young-Ho;Kim, Hyung-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.1
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    • pp.49-54
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    • 2010
  • Fretting wear behavior under elastic deformable contacts was experimentally examined by using a simulated dual cooled fuel rod and its supporting structure. As this fuel rod has larger outer diameter than the typical solid rod to accommodate sufficient internal flow, new supporting structure geometries should be designed and their reliabilities (i.e. vibration characteristics, fretting wear resistance, etc.) are also examined with both analytical and experimental methods. In this study, the supporting structure characteristics and fretting wear behaviors are analyzed and examined by using one of the supporting structure candidates which has an embossing shape. The supporting structure characteristics were examined by using a specially designed test rig and their results were compared with that of analytical method. Based on the test results, the relationship between the supporting structure characteristics and their fretting wear behaviors was discussed in detail.

Fretting Wear Characteristics of Nuclear Fuel Rod Material (핵연료봉재의 프레팅 마멸 특성)

  • 김태형;조광희;김석삼
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1996.04b
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    • pp.25-29
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    • 1996
  • The fretting wear characteristics for Zircaloy-4 tube used as fuel rod in the nuclear power plant have been investigated. The fretting wear tester was designed and manufactured for this experiment. This study was focused on main factors of fretting wear, cycle, slip amplitude and normal load. The worn surfaces were observed by SEM.

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A Study on the Sliding/Impact Wear of a Nuclear Fuel Rod in Room Temperature Air:(I) Development of a Test Rig and Characteristic Analysis (상온 핵연료봉 미끄럼/충격 마멸특성연구:(I) 장치개발 및 특성분석)

  • Lee, Young-Ho;Lee, Kang-Hee;Kim, Hyung-Kyu
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1859-1863
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    • 2007
  • A new type of a fretting wear tester has been designed and developed in order to simulate the actual vibration behavior of a nuclear fuel rod for springs/dimples in room temperature. When considering the actual contact condition between fuel rod and spring/dimple, if fretting wear progress due to the flow-induced vibration (FIV) under a specific normal load exerted on the fuel rod by the elastic deformation of the spring, the contacting force between the fuel rod and dimple that were located in the opposite side should be decreased. Consequently, the evaluation of developed spacer grids against fretting wear damage should be performed with the results of a cell unit experiments because the contacting force is one of the most important variables that influence to the fretting wear mechanism. Therefore, it is necessary to develop a new type of fretting test rig in order to simulate the actual contact condition. In this paper, the development procedure of a new fretting wear tester and its performance were discussed in detail.

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