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Research Papers: Nuclear Power

Transient Three-Dimensional Stability Analysis of Supercritical Water Reactor Rod Bundle Subchannels by a Computatonal Fluid Dynamics Code

[+] Author and Article Information
M. Sharabi

Dipartimento di Ingegneria Meccanica Nucleare e della Produzione, Università di Pisa, Via Diotisalvi 2, 56126 Pisa, Italy

W. Ambrosini

Dipartimento di Ingegneria Meccanica Nucleare e della Produzione, Università di Pisa, Via Diotisalvi 2, 56126 Pisa, Italywalter.ambrosini@ing.unipi.it

S. He

School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UKs.he@abdn.ac.uk

Pei-Xue Jiang

Department of Thermal Engineering, Tsinghua University, Beijing 100084, Chinajiangpx@mail.tsinghua.edu.cn

Chen-Ru Zhao

Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

J. Eng. Gas Turbines Power 131(2), 022903 (Jan 05, 2009) (6 pages) doi:10.1115/1.3032437 History: Received July 29, 2008; Revised July 31, 2008; Published January 05, 2009

The paper describes the application of computational fluid dynamics (CFD) in simulating density wave oscillations in triangular and square pitch rod bundles. The FLUENT code is used for this purpose, addressing typical conditions proposed for supercritical water reactor (SCWR) conceptual design. The RELAP5 code and an in-house 1D linear stability code are also adopted to compare the results for instability thresholds obtained by different techniques. Transient analyses are performed both by the CFD code and RELAP5 , with increasing heating rates and constant pressure drop across the channel, up to the occurrence of unstable behavior. The obtained results confirm that the density wave mechanism is similar in rod bundle and in axisymmetric configurations.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Subchannels of triangular and square pitch assemblies in SCWRs

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Figure 2

View of the grid adopted for triangular and square pitch assemblies

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Figure 3

Transient system response for the triangular pitch assembly obtained by stopping the power increase at 10 s

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Figure 4

Transient system response for the triangular pitch assembly obtained by stopping the power increase at 20 s

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Figure 5

Transient system response for the triangular pitch assembly obtained by stopping the power increase at 30 s

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Figure 6

Transient system response for the square pitch assembly obtained by stopping the power increase at 30 s

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Figure 7

Onset of oscillations in terms of NTPC for the triangular and square pitch assemblies

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Figure 8

Onset of instability based on NTPC as predicted by the RELAP/MOD3.3 for the triangular and square pitch assemblies

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Figure 9

Stability map for the triangular pitch assembly (Λ=8.0, Fr=0.15, and maximum Courant number=0.9)

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Figure 10

Stability map for the square pitch assembly (Λ=6.7, Fr=0.03, and maximum Courant number=0.9)

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Figure 11

Mass flow rate distribution along the axial coordinate for the triangular pitch assembly

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Figure 12

Mass flow rate distribution along the axial coordinate for the square pitch assembly

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Figure 13

Temperature contours during oscillations for the triangular pitch assembly

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Figure 14

Temperature contours during oscillations for the square pitch assembly

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