Fission-gas Release from Uranium Nitride at High Fission-rate Density
Fission-gas Release from Uranium Nitride at High Fission-rate Density

Author: Michael B. Weinstein

Publisher:

Published: 1973

Total Pages: 68

ISBN-13:

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A sweep gas facility has been used to measure the release rates of radioactive fission gases from small UN specimens irradiated to 8-percent burnup at high fission-rate densities. The measured release rates have been correlated with an equation whose terms correspond to direct recoil release, fission-enhanced diffusion, and atomic diffusion (a function of temperature). Release rates were found to increase linearly with burnups between 1.5 and 8 percent. Pore migration was observed after operation at 1550 K to over 6 percent burnup.

A Fission Gas Release Correlation for Uranium Nitride Fuel Pins
A Fission Gas Release Correlation for Uranium Nitride Fuel Pins

Author: Michael B. Weinstein

Publisher:

Published: 1973

Total Pages: 68

ISBN-13:

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A model was developed to predict fission gas releases from UN fuel pins clad with various materials. The model was correlated with total release data obtained by different experimentors, over a range of fuel temperatures primarily between 1250 and 1660 K, and fuel burnups up to 4.6 percent. In the model, fission gas is transported by diffusion mechanisms to the grain boundaries where the volume grows and eventually interconnects with the outside surface of the fuel. The within grain diffusion coefficients are found from fission gas release rate data obtained using a sweep gas facility.