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Stepwise Release of Fission Gas from UO2 Fuel

M. J. F. Notley, J. R. MacEwan

Nuclear Technology

Volume 2 / Number 6 / December 1966 / Pages 477-480


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Measurements of the fission-product gas pressure in UO2 fuel elements during irradiation have shown that a significant amount of gas is released during power transients. The gas appears to he released as the element power is decreased to zero during reactor shutdown; little release occurs as the power is raised at startup. It is postulated that gas trapped in bubbles or in a central void is released by cracking or stress-induced movement during the power transient.

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