Paper Title:
Annealing Effect of Thermal Conductivity on Thermal Stress Induced Fracture of Nuclear Graphite
  Abstract

Graphite materials are used for structural components in the core of high temperature gas-cooled reactors (HTGRs) because of their excellent thermo/mechanical properties. When the core temperature is raised at an accident, the thermal stress of the components is induced, and it enhances the fracture probability of them. In general, the thermal conductivity of graphite is decreased by neutron irradiation due to irradiation-induced defects preventing heat conduction by phonon. It is hence expected that decreased thermal conductivity is recovered to some extent by thermal annealing at the accident. Therefore, the consideration of the thermal annealing effect is placed as much important subject in the fracture/strength evaluation of the graphite components at the accident. In the present study, the thermal stress and the fracture probability of graphite components influenced by the thermal annealing were investigated by a finite element method (FEM) analysis. It was shown that the annealing effect decreases the thermal stress and a certain level of the fracture probability.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
1698-1703
DOI
10.4028/www.scientific.net/KEM.297-300.1698
Citation
J. Sumita, T. Shibata, M. Ishihara, T. Iyoku, N. Tsuji, "Annealing Effect of Thermal Conductivity on Thermal Stress Induced Fracture of Nuclear Graphite ", Key Engineering Materials, Vols. 297-300, pp. 1698-1703, 2005
Online since
November 2005
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$32.00
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