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Research Papers: Nuclear Power

Computational Analysis of Downcomer Boiling Phenomena Using a Component Thermal Hydraulic Analysis Code, CUPID

[+] Author and Article Information
Hyoung Kyu Cho

Thermal Hydraulics Safety Research Division, Korea Atomic Energy Research Institute, 1045 Daeduk-daero, Yuseong-Gu, Daejeon 305-353, Republic of Koreahkcho@kaeri.re.kr

Byong Jo Yun, Ik Kyu Park, Jae Jun Jeong

Thermal Hydraulics Safety Research Division, Korea Atomic Energy Research Institute, 1045 Daeduk-daero, Yuseong-Gu, Daejeon 305-353, Republic of Korea

J. Eng. Gas Turbines Power 133(5), 052914 (Dec 21, 2010) (9 pages) doi:10.1115/1.4002869 History: Received July 23, 2010; Revised August 02, 2010; Published December 21, 2010; Online December 21, 2010

For the analysis of transient two-phase flows in nuclear reactor components such as a reactor vessel, a steam generator, and a containment, KAERI has developed a three-dimensional thermal hydraulic code, CUPID . It adopts a three-dimensional, transient, two-phase and three-field model and includes various physical models and correlations of the interfacial mass, momentum, and energy transfer for the closure. In the present paper, the CUPID code and its two-phase flow models were assessed against the downcomer boiling experiment, which was performed to simulate the downcomer boiling phenomena. They may happen in the downcomer of a nuclear reactor vessel during the reflood phase of a postulated loss of coolant accident. The stored energy release from the reactor vessel to the liquid inside the downcomer causes the boiling on the wall, and it can reduce the hydraulic head of the accumulated water, which is the driving force of water reflooding to the core. The computational analysis using the CUPID code showed that it can appropriately predict the multidimensional boiling phenomena under a low pressure and low flow rate condition with modification of the bubble size model.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Interphase surface topology concept

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Figure 2

Schematic diagram of the DOBO facility

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Figure 3

Schematic diagram of the DOBO test section

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Figure 4

Local void fraction measurement results

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Figure 5

Two-dimensional void fraction distribution

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Figure 6

Gas and liquid velocity profiles

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Figure 7

Flow behavior in DOBO

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Figure 8

Computational mesh and boundary conditions

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Figure 9

Comparison of the DOBO test and the calculation result: void fraction

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Figure 10

Calculation result with the modified model: void fraction

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Figure 11

Calculation result with the modified model: gas and liquid velocities

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