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Research Papers

Analysis of Focusing Effect of Light Metallic Layer in Stratified Molten Pool Under IVR-ERVC Condition

[+] Author and Article Information
Xi Wang

State Nuclear Power Research Institute,
Building 1, Compound No. 29, North 3rd Ring Road, Xicheng District, Beijing 100029, China
e-mail: wangxi@snptc.com.cn

Xu Cheng

State Nuclear Power Research Institute,
Building 1, Compound No. 29, North 3rd Ring Road, Xicheng District, Beijing 100029, China
e-mail: chengxu@snptc.com.cn

1Corresponding author.

Manuscript received March 14, 2014; final manuscript received January 11, 2015; published online March 24, 2015. Assoc. Editor: Richard R Schultz.

ASME J of Nuclear Rad Sci 1(2), 021007 (Mar 24, 2015) (7 pages) Paper No: NERS-14-1001; doi: 10.1115/1.4029619 History: Received March 14, 2014; Accepted January 15, 2015; Online March 24, 2015

The main failure mechanism of in-vessel corium retention through external reactor vessel cooling (IVR-ERVC) happens when the local heat flux through reactor pressure vessel (PRV) wall exceeds the critical heat flux (CHF). High local heat flux in the molten pool is usually caused by the metallic layer focusing effect due to stratification. In this paper, depending on experimental correlations, both the lump parameter method and computational fluid dynamic method are used to investigate the mechanism of focusing effect. The concentration factor varying with the height of metallic layer is studied. The results show that the lump parameter method probably overestimates the wall heat flux of metal layer.

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Figures

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Fig. 1

Energy though metallic layer in stratified molten pool

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Fig. 2

Temperature varying with the ratio of height to radius (qb=0.5  MW/m2)

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Fig. 3

Temperature varying with the ratio of height to radius (qb=1.0  MW/m2)

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Fig. 4

Temperature varying with the ratio of height to radius (qb=2.0  MW/m2)

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Fig. 5

Ratio of upward heat flux and bottom heat flux varying with the height radius ratio

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Fig. 6

Concentration factor varying with height to radius ratio at different boundary conditions

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Fig. 7

Test section of MELAD experiment design [5]

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Fig. 8

Temperature field and velocity field of MELAD experiment simulation

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Fig. 9

Upward Nusselt number varying with Rayleigh number in metallic layer

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Fig. 10

Sideward Nusselt number varying with Rayleigh number in metallic layer

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Fig. 11

Temperature and velocity field of metallic layer (H/R=0.3,0.2,0.1, R=2.5  m)

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Fig. 12

Heat flux shape at upper surface along the cross section of metallic layer

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Fig. 13

Concentration factor varying with ratio of height and radius, R=2.5  m

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