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http://dx.doi.org/10.5050/KSNVN.2006.16.11.1115

Vibration Characteristics of a Nuclear Fuel Rod in Uniform Axial Flow  

Jeon, Sang-Youn (한전원자력연료(주))
Suh, Jung-Min (한전원자력연료(주))
Kim, Kyu-Tae (한전원자력연료(주))
Park, Nam-Gyu (한전원자력연료(주))
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.16, no.11, 2006 , pp. 1115-1123 More about this Journal
Abstract
Nuclear fuel rods are exposed to axial flow in a reactor, and flow-induced-vibration due to the flow usually causes damage in the fuel rods. Thus a prior knowledge about dynamic behavior of a fuel rod exposed to the flow condition should be provided. This paper shows that dynamic characteristics of a nuclear fuel rod depend on axial flow velocity. Assuming small lateral displacement, the effects of uniform axial flow are investigated. The analytic results show that axial flow generally reduces fuel rod stiffness and raises its damping in normal condition. Also, the critical axial velocities which make the fuel rod behavior unstable were found. That is, solving generalized eigenvalue equation of the fuel rod dynamic system, the eigenvalues with positive real part are detected. Based on the simulation results, on the other hand, it turns out that the ordinary axial flow in nuclear reactors does not affect to stability of a nuclear fuel rod even in the conservative condition.
Keywords
Nuclear Fuel Rod; Vibration Characteristics; Axial Flow; Stability; Critical Velocity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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