A key element of the fuel channel life cycle management in CANDU® nuclear reactors is to prevent contact between the pressure tube (PT) and the calandria tube (CT) in a fuel channel. By preventing PT-CT contact, the development of hydride blisters and delayed hydride cracking of the PT can be avoided. The PT-CT contact is a result of in-reactor deformation due to irradiation induced creep of the fuel channel assembly. Excessive sagging of the PT can also interfere with the free passage of the fuel bundles when the channel is refueled. Contact of the CT with reactor control mechanisms located horizontally between the fuel channels can result from excessive sag of the CT. The prediction of dimensional changes due to in-reactor creep and the time of PT-CT contact is calculated using finite element modeling of the fuel channel with appropriate creep constitutive laws describing PT and CT deformation. The three-dimensional nature of creep deformation of fuel channels can be approximated by a one-dimensional finite element model (1D-FEM), which is a computationally tractable problem. However, the simplifications of a 1D-FEM model come at the expense of loss of prediction accuracy. This paper compares creep deformation analysis of fuel channels using 1D-FEM and 3D-FEM models. The comparison is based on PT and CT sag profiles as well as on PT-CT gap at different time intervals during service of the fuel channel. Results from the comparative analysis show that the 1D-FEM model predicts greater values of PT-CT gap. The difference in gap predicted between both FEM models increases rapidly when the minimum gap is located in the outlet span. At 250,000 equivalent full power hours, the 1D-FEM model overestimate the gap by 1.12 mm with respect to the 3D-FEM model.
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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5163-0
PROCEEDINGS PAPER
A Comparative Evaluation of Finite Element Modeling of Creep Deformation of Fuel Channels in CANDU® Nuclear Reactors
F. J. Tallavo,
F. J. Tallavo
University of Waterloo, Waterloo, ON, Canada
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M. D. Pandey,
M. D. Pandey
University of Waterloo, Waterloo, ON, Canada
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M. Jyrkama,
M. Jyrkama
University of Waterloo, Waterloo, ON, Canada
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N. C. Christodoulou,
N. C. Christodoulou
University of Waterloo, Waterloo, ON, Canada
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G. A. Bickel,
G. A. Bickel
Canadian Nuclear Laboratories, Chalk River, ON, Canada
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B. W. Leitch
B. W. Leitch
Canadian Nuclear Laboratories, Chalk River, ON, Canada
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F. J. Tallavo
University of Waterloo, Waterloo, ON, Canada
M. D. Pandey
University of Waterloo, Waterloo, ON, Canada
M. Jyrkama
University of Waterloo, Waterloo, ON, Canada
N. C. Christodoulou
University of Waterloo, Waterloo, ON, Canada
G. A. Bickel
Canadian Nuclear Laboratories, Chalk River, ON, Canada
B. W. Leitch
Canadian Nuclear Laboratories, Chalk River, ON, Canada
Paper No:
PVP2018-84982, V03BT03A017; 9 pages
Published Online:
October 26, 2018
Citation
Tallavo, FJ, Pandey, MD, Jyrkama, M, Christodoulou, NC, Bickel, GA, & Leitch, BW. "A Comparative Evaluation of Finite Element Modeling of Creep Deformation of Fuel Channels in CANDU® Nuclear Reactors." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 3B: Design and Analysis. Prague, Czech Republic. July 15–20, 2018. V03BT03A017. ASME. https://doi.org/10.1115/PVP2018-84982
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