Models of grain-boundary cracking and diffusion growth of integrain bubbles in rapidly heated irradiated fuel

Models describing the behavior of nonequilibrium grain-boundary bubbles with gas in irradiated nuclear fuel undergoing rapid heating in the absence of irradiation are proposed. Two mechanisms for the decrease in excess volume in bubbles are examined: a decrease due to cracking of the matrix along gr...

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Bibliographic Details
Published in:Atomic energy (New York, N.Y.) N.Y.), 1999-07, Vol.87 (1), p.490-495
Main Authors: Likhanskii, V. V., Matveev, L. V.
Format: Article
Language:English
Subjects:
Bubbles
Irradiation
Nuclear fuels
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Summary:Models describing the behavior of nonequilibrium grain-boundary bubbles with gas in irradiated nuclear fuel undergoing rapid heating in the absence of irradiation are proposed. Two mechanisms for the decrease in excess volume in bubbles are examined: a decrease due to cracking of the matrix along grain boundaries and a decrease due to diffusion entry of vacancies. A criterion for cracking onset and an expression for the finite size of cracks, determined by the internal volume in bubbles and the thermomechanical stresses in a pellet, are obtained. The dynamics of growth of supercompressed bubbles, which is determined by the diffusion fluxes of vacancies and interstices, is described for the case where cracking does not occur. 1 figure, 11 references.[PUBLICATION ABSTRACT]
ISSN:1063-4258
1573-8205
DOI:10.1007/BF02673207