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Research Papers: Nuclear Power

Measurement and Analysis for Rewetting Velocity Under Post-BT Conditions During Anticipated Operational Occurrence of BWR

[+] Author and Article Information
Sibamoto Yasuteru1

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Sirakata-Sirane, Tokai, Naka, Ibaraki 319-1195, Japansibamoto.yasuteru@jaea.go.jp

Maruyama Yu, Nakamura Hideo

Nuclear Safety Research Center, Japan Atomic Energy Agency, 2-4 Sirakata-Sirane, Tokai, Naka, Ibaraki 319-1195, Japan

1

Corresponding author.

J. Eng. Gas Turbines Power 132(10), 102909 (Jul 06, 2010) (8 pages) doi:10.1115/1.4000622 History: Received July 27, 2009; Revised September 03, 2009; Published July 06, 2010; Online July 06, 2010

A series of experiments was performed for rewetting phenomena on dried-out fuel rod surfaces under post-boiling transition (post-BT) conditions with high-pressure and high-water flow rate simulating anticipated operational occurrences of a BWR. An analytical model for rewetting velocity, defined by a propagation velocity of a quench front, has been developed on the basis of the experimental results. The rewetting for the post-BT condition is characterized by the faster propagation of the quench front than that for reflood phase conditions during a postulated large-break loss-of-coolant accident. In order to provide an explanation of this characteristic, the present analytical model took an effect of a precursory cooling into account by modifying the existing correlation by Sun (1975, “Effects of Precursory Cooling on Falling-Film Rewetting,” ASME J. Heat Transfer, 97, pp. 360–365), which is based on a one-dimensional analysis in a flow direction during the reflood phase. The present model demonstrates that the precursory cooling can significantly increase the rewetting velocity by more than an order of magnitude. Applying the experimental correlation developed in the separately conducted experiment into the heat transfer coefficient in the present model at a wet and a dry region with precursory cooling, our data of the rewetting velocity as well as the wall temperature profiles for the variable flow rates are successfully predicted.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 5

Rewetting time versus thermocouple positions

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Figure 6

Comparison of predicted quench front velocity by Eq. 38 and the experimental data

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Figure 7

Comparison of axial wall temperature distribution

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Figure 1

Heat transfer coefficient for wall superheat in post-BT condition

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Figure 2

Schematic view of rewetting phenomena and precursory cooling ahead of rewet front

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Figure 3

Schematic view of test procedures

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Figure 4

Example of inverse problem analysis estimated by Eqs. 5,6

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