Research Papers: Seismic Engineering

A Modeling Approach for Interlinked Feeder Pipes in CANDU® Reactors

[+] Author and Article Information
Nima Zobeiry, Wolf Reinhardt

 Atomic Energy of Canada Limited, Mississauga, ON, L5K1B2, Canada

CANDU is a registered trade-mark of Atomic Energy of Canada Limited.

J. Pressure Vessel Technol 131(4), 041802 (Jun 26, 2009) (6 pages) doi:10.1115/1.3109985 History: Received December 14, 2007; Revised August 13, 2008; Published June 26, 2009

The feeder pipes of a typical CANDU® reactor supply each of the 380 fuel channels with coolant and are individually connected to the large bore primary piping. In some designs, the longer pipes are interlinked with spacer rods, which mitigate vibrations and prevent contact between adjacent feeder pipes. Under severe loading conditions, the spacer rods will yield, which will prevent overstressing the pipes as the stiffness of the coupling gets reduced. Spacer yielding also provides increased damping for dynamic loads. It has recently become practicable to model the entire interlinked system in a single model. This paper presents the modeling approach for seismic analysis and for the fuel channel creep (a radiation induced slow unidirectional anchor motion). Results with and without spacer bars are compared to illustrate the effect of spacers. The importance of representing spacer yielding in the model is discussed.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Primary heat transport system—typical feeder arrangement

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Figure 2

Positions of spacers on a feeder

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Figure 3

Schematic of a spacer model and the stiff beam connecting the end of spacer to the corresponding node on the feeder

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Figure 4

Flowchart of modeling for the feeder assembly

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Figure 5

Complete model of the horizontal feeders in a quadrant of a reactor face

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Figure 6

View of the lower segment of the horizontal feeders and spacers, as modeled in ANSYS®

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Figure 7

Changes in the feeder stress intensities as a result of removing the spacers and creep loading

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Figure 8

Schematic of the reduced modulus approach (adapted from Ref. 8). The modulus is reduced, depending on the value of q.

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Figure 9

Flowchart of feeder stress analysis using the reduced modulus approach

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Figure 10

Variation in the difference between spacer stresses and yield point throughout the iterations for the reduced modulus approach

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Figure 11

Changes in the feeder stress intensities as a result of removing the spacers and seismic loading




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