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Research Papers

Uncertainty Quantification of the RELAP5 Interfacial Friction Model in the Rod Bundle Geometry

[+] Author and Article Information
Ikuo Kinoshita

Institute of Nuclear Safety System, Inc. (INSS),
64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan
e-mail: kinoshita@inss.co.jp

Toshihide Torige

Institute of Nuclear Safety System, Inc. (INSS),
64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan
e-mail: torige.toshihide@inss.co.jp

Minoru Yamada

MHI Nuclear Engineering Co., Ltd. (MNEC),
3-3-1 Minatomirai, Nishi-ku, Yokohama, Kanagawa 220-8401, Japan
e-mail: minoru2_yamada@mnec.mhi.co.jp

1Corresponding author.

Manuscript received January 31, 2015; final manuscript received August 12, 2015; published online February 29, 2016. Assoc. Editor: Milorad Dzodzo.

ASME J of Nuclear Rad Sci 2(2), 021003 (Feb 29, 2016) (8 pages) Paper No: 15-1012; doi: 10.1115/1.4031377 History: Received January 31, 2015; Accepted August 12, 2015

Interfacial friction in the core affects the two-phase mixture level and the distribution of the dispersed gas phase during a small-break loss-of-coolant accident (LOCA). The RELAP5/MOD3.2 code uses the drift flux model to describe the interfacial friction force in vertical dispersed flow, and the Chexal–Lellouche drift flux correlation is used for the rod bundle geometry. In the present study, the RELAP5 model uncertainty was quantified for the bubbly–slug interfacial friction model in the rod bundle geometry by conducting numerical analyses of void profile tests in the Thermal Hydraulic Test Facility (THTF) of the Oak Ridge National Laboratory (ORNL). The model uncertainty parameter was defined as a multiplier for the interfacial friction coefficient. Numerical analyses were performed by adjusting the multiplier so that the predicted void fractions agreed with the measured test data. The resultant distribution of the multipliers represented the interfacial friction model uncertainty.

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References

Figures

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Fig. 1

Schematic of THTF at ORNL [12]

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Fig. 2

Pressure instrumentation [12]

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Fig. 3

Sectional view of the test section of the THTF [12]

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Fig. 4

Nodalization of the analyses

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Fig. 5

Comparison of predicted and measured void fraction profiles (Test 3.09.10J)

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Fig. 6

Comparison of predicted and measured void fraction profiles (Test 3.09.10K)

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Fig. 7

Comparison of predicted and measured void fraction profiles (Test 3.09.10M)

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Fig. 8

Comparison of predicted and measured void fraction profiles (Test 3.09.10N)

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Fig. 9

Comparison of predicted and measured void fraction profiles (Test 3.09.10AA)

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Fig. 10

Comparison of predicted and measured void fraction profiles (Test 3.09.10BB)

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Fig. 11

Comparison of predicted and measured void fraction profiles (Test 3.09.10CC)

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Fig. 12

Comparison of predicted and measured void fraction profiles (Test 3.09.10DD)

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Fig. 13

Comparison of predicted and measured void fraction profiles (Test 3.09.10EE)

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Fig. 14

Comparison of predicted and measured void fraction profiles (Test 3.09.10FF)

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Fig. 15

Comparison of measured and predicted void fraction for THTF test

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Fig. 16

Interfacial friction multiplier CM

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Fig. 17

Distribution of interfacial friction multiplier CM

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