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Research Papers

Influence of Boundary Conditions, Vessel Geometry, and Simulant Materials on the Heat Transfer of Volumetrically Heated Melt in a Light Water Reactor Lower Head

[+] Author and Article Information
X. Gaus-Liu

Institute for Nuclear and Energy Technologies,
Karlsruhe Institute of Technology,
Hermann-von Helmholtz-Platz 1,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: xiaoyang.gaus-liu@kit.edu

A. Miassoedov

Institute for Nuclear and Energy Technologies,
Karlsruhe Institute of Technology,
Hermann-von Helmholtz-Platz 1,
Eggenstein-Leopoldshafen 76344, Germany
e-mail: alexei.miassoedov@kit.edu

1Corresponding author.

Manuscript received September 22, 2016; final manuscript received January 25, 2017; published online May 25, 2017. Assoc. Editor: Guoqiang Wang.

ASME J of Nuclear Rad Sci 3(3), 031003 (May 25, 2017) (11 pages) Paper No: NERS-16-1107; doi: 10.1115/1.4035853 History: Received September 22, 2016; Revised January 25, 2017

This study investigates heat transfer characters of a volumetrically heated melt pool in LWR lower plenum. Experimental restrictions on prediction reliability are discussed. These restrictions include cooling boundary conditions, vessel geometries, and simulant melt selection on general and localized heat transfer. A survey of existing heat transfer correlations derived from individual experimental definitions is presented. The inconsistency in parameter definitions in Nu–Ra correlations is discussed. Furthermore, the discrepancy of upward Nu depending on the existence of crust is stressed. Several serials of experiments with different combinations boundary condition of external cooling and top cooling were performed in LIVE3D and LIVE2D facilities. The experiments were conducted with simulants with and without crust formation. The influences of cooling boundary conditions, the vessel geometry, and the simulant material on overall heat transfer as well as on heat flux distribution are analyzed. This paper provides own explanations about the discrepancies among the exiting heat transfer correlations and recommends the most suitable descriptions of melt pool heat transfer under different accident management strategies.

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References

Figures

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Fig. 1

Turbulent regimes in a melt pool with top and side wall cooling

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Fig. 2

LIVE3D test facility. Top: with top insulation lid, bottom: with cooling lid.

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Fig. 3

Infrared image of the turbulent pattern on melt free surface

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Fig. 4

LIVE-Nuup in comparison with former predictions and experimental results

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Fig. 5

LIVE-Nudn in comparison with former predictions and experimental results

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Fig. 6

LIVE 3D normalized temperature distribution

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Fig. 7

LIVE 2D normalized temperature distribution

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Fig. 8

Melt temperature fit curves of LIVE3D and LIVE2D tests

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Fig. 9

Normalized heat flux distribution through vessel wall in LIVE 3D tests

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Fig. 10

Normalized heat flux distribution through vessel wall in LIVE 2D tests

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Fig. 11

Heat flux fit curves of LIVE3D and LIVE2D tests

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Fig. 12

Normalized heat flux distribution of LIVE 3D tests in comparison with other predictions

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Fig. 13

Heat balance between heat power input and the total heat rate through external cooling and top cooling lid in LIVE-L7V test

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