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http://dx.doi.org/10.3795/KSME-A.2015.39.3.249

Simulation of Asymmetric Fuel Thermal Behavior Using 3D Gap Conductance Model  

Kang, Chang Hak (Dept. of Mechanical Engineering, KAIST)
Lee, Sung Uk (Dept. of Mechanical Engineering, KAIST)
Yang, Dong Yol (Dept. of Mechanical Engineering, KAIST)
Kim, Hyo Chan (LWR fuel technology division, Korea Atomic Energy Research Institute)
Yang, Yong Sik (LWR fuel technology division, Korea Atomic Energy Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.3, 2015 , pp. 249-257 More about this Journal
Abstract
A fuel assembly consists of fuel rods composed of pellets (UO2) and a cladding tube (Zircaloy). The role of the fuel rods in the reactor is to generate heat by nuclear fission, as well as to retain fission products during operation. A simulation method using a computer program was used to evaluate the safety of the nuclear fuel rods. This computer program has been called the fuel performance code. In the analysis of a light water reactor fuel rod, the gap conductance, which depended on the distance between the pellets and cladding tube, mainly influenced the thermomechanical behavior of the fuel rod. In this work, a 3D gap element was proposed to simulate the thermo-mechanical behavior of the nuclear fuel rod, considering the gap conductance. To implement the proposed 3D gap element, a 3D thermo-mechanical module was also developed using FORTRAN90. The asymmetric characteristics of the nuclear fuel rod, such as the MPS (missing pellet surface) and eccentricity, were simulated to evaluate the proposed 3D gap element.
Keywords
Gap Conductance; Nuclear Fuel Rod; Finite Element Analysis; 3D Gap Element; Missing Pellet Surface; Eccentricity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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