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Research Papers: Nuclear Power

Development of Local Heat Transfer Models for the Safety Assessment of High Temperature Gas-Cooled Reactor Cores—Part II: Prismatic Modular Reactors

[+] Author and Article Information
Richard Stainsby, Matthew Worsley, Frances Dawson, Joakim Baker, Andrew Grief, Paul Coddington

 AMEC Nuclear, Knutsford, Cheshire WA16 8QZ, UK

Ana Dennier

 AMEC NSS, Toronto, ON, M5G 1X6, Canada

J. Eng. Gas Turbines Power 132(1), 012907 (Oct 07, 2009) (8 pages) doi:10.1115/1.3126770 History: Revised October 17, 2008; Received November 28, 2008; Published October 07, 2009

This paper extends the work of Part I to be applicable to prismatic block fuel elements and presents a model developed for determining fuel compact and fuel block temperatures of a prismatic core modular reactor. The model is applicable both in normal operation and under fault conditions and is an extension of the multiscale modeling techniques presented in Part I. The new model has been qualified by comparison with finite element simulations for both steady-state and transient conditions. Furthermore, a model for determining the effective conductivity of the block fuel elements—important for heat removal in loss of flow conditions—is presented and, again, qualified by comparison with finite element simulations. A numerical model for predicting conduction heat transfer both within and between block fuel elements has been developed, which, when coupled with the above multiscale model, allows simulations of whole cores to be carried out, while retaining the ability to predict the temperatures of individual coolant channels and individual coated particles in the fuel if required.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Unit cell of one coolant and six fuel channels

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Figure 2

The supermesoscale domain

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Figure 3

The mesoscale domain

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Figure 4

Original hexagonal unit cell with supermeso- and mesoscale domains overlaid

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Figure 5

Multiscale temperatures along a line between the coolant channel and fuel compact at (a) 1.29 s and (b) steady state

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Figure 6

Region of fuel block and sector chosen for the FE model

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Figure 7

Steady-state temperature distribution as calculated by the FE model

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Figure 8

Two-sector and interblock gap model

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Figure 9

Two-sector and interblock gap temperatures (Variant 1) as predicted by FE calculations

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