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Research Papers: Nuclear Power

Development of Local Heat Transfer Models for Safety Assessment of High Temperature Gas-Cooled Reactor Cores—Part I: Pebble Bed Reactors

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

 AMEC Nuclear, Knutsford, Cheshire WA16 8QZ, UK

Ana Dennier

 AMEC NSS, Toronto, ON, M591X6 Canada

J. Eng. Gas Turbines Power 132(1), 012906 (Oct 07, 2009) (9 pages) doi:10.1115/1.3126775 History: Received November 28, 2008; Revised February 12, 2009; Published October 07, 2009

This and the subsequent paper present models developed for determining fuel particle and fuel element temperatures in normal operation and transient conditions in high temperature reactor cores. Multiscale modeling concepts are used to develop the models for both pebble bed and prismatic core types. This paper, Part I, presents the development of the model for pebble bed reactors. Comparison is made with finite element simulations of an idealized “two-dimensional” pebble in transient conditions, and with a steady-state analytical solution in a spherical pebble geometry. A method is presented for determining the fuel temperatures in the individual batches of a multibatch recycle refuelling regime. Implementation of the multiscale and multibatch fuel models in a whole-core computational fluid dynamics model is discussed together with the future intentions of the research program.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Sketch of part of the radial temperature distribution through a pebble

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Figure 2

A “microsphere” containing a single TRISO particle and its share of the surrounding graphite

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Figure 3

One-dimensional heated bar problem with three discrete heat sources

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Figure 4

(a) Power distribution and (b) decomposed power distribution

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Figure 5

Microscale domain

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Figure 6

Schematic representation of the cylindrical pebble

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Figure 7

Finite element prediction of the steady-state temperature distribution within the cylindrical pebble

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Figure 8

Comparison of steady-state radial temperature profiles predicted by finite element analysis and the multiscale model

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Figure 9

Comparison of transient temperature profiles at 0.165 s

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Figure 10

Comparison of transient temperature profiles at 0.66 s

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Figure 11

Radial temperature profile within a pebble passing through four specimen particles

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Figure 12

Development of the microscale temperature at the center of a particle

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Figure 13

Development of the mesoscale temperature at the center of the pebble

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Figure 14

Development of mesoscale temperature profiles with time

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Figure 15

Development of microscale temperature profiles within a coated particle with time

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