Changes of the surface-to-volume ratio and diffusion coefficient of fission gas in fuel pellets during irradiation
Short-lived fission gas release from fuel pellets during irradiation was investigated based on the experimental results of the gas-flow rigs irradiated in the Halden Heavy Water Reactor (HBWR). The release-to-birth ( R/ B) rates of short-lived fission gas were measured by means of gas-flow measureme...
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Published in | Journal of nuclear materials Vol. 402; no. 2; pp. 108 - 115 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
31.07.2010
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Short-lived fission gas release from fuel pellets during irradiation was investigated based on the experimental results of the gas-flow rigs irradiated in the Halden Heavy Water Reactor (HBWR).
The release-to-birth (
R/
B) rates of short-lived fission gas were measured by means of gas-flow measurement during the irradiation experiments. Surface-to-volume (
S/
V) ratios of fuel pellets and diffusion coefficients of short-lived fission gas release were evaluated from the obtained (
R/
B) values. The increase of (
S/
V) ratio agreed well with the point where the fuel temperature exceeded the threshold of 1% fission gas release. This indicates that the interlinkage of fission gas bubbles occurred there. The evaluated diffusion coefficients scattered in the range between 10
−23 and 10
−17
m
2/s, and the effects of fuel type (UO
2 or MOX) were not clearly observed. In addition, it is likely that the restructuring effect of fuel pellet on the diffusion coefficients of short-lived fission gas at least in the fuel pellet matrix is negligible in high burnup region where the rim structure forms in the fuel pellet. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0022-3115 1873-4820 |
DOI: | 10.1016/j.jnucmat.2010.05.004 |