Mechanistic Prediction of Transient Fission-gas Release from LWR Fuel. [UO2].
Mechanistic Prediction of Transient Fission-gas Release from LWR Fuel. [UO2].

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Published: 1978

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The steady-state and transient gas release and swelling subroutine (GRASS-SST) is a mechanistic computer code for the prediction of fission-gas behavior in UO2-base fuels. GRASS-SST treats fission-gas release and fuel swelling on an equal basis and simultaneously treats all major mechanisms that influence fission-gas behavior. The GRASS-SST transient analysis has evolved through comparisons of code predictions with the fission-gas release and physical phenomena that occur during reactor operation and transient direct-electrical heating (DEH) testing of irradiated light-water reactor fuel. The GRASS-SST steady-state analysis has undergone verification for end-of-life fission-gas release and intragranular bubble-size distributions. The results of GRASS-SST predictions for transient fission-gas release during DEH tests are in good agreement with experimental data.

Mechanistic Prediction of Transient Fission-gas Release from LWR Fuel. [UO/sub 2/].
Mechanistic Prediction of Transient Fission-gas Release from LWR Fuel. [UO/sub 2/].

Author:

Publisher:

Published: 1978

Total Pages:

ISBN-13:

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The steady-state and transient gas release and swelling subroutine (GRASS-SST) is a mechanistic computer code for the prediction of fission-gas behavior in UO/sub 2/-base fuels. GRASS-SST treats fission-gas release and fuel swelling on an equal basis and simultaneously treats all major mechanisms that influence fission-gas behavior. The GRASS-SST transient analysis has evolved through comparisons of code predictions with the fission-gas release and physical phenomena that occur during reactor operation and transient direct-electrical heating (DEH) testing of irradiated light-water reactor fuel. The GRASS-SST steady-state analysis has undergone verification for end-of-life fission-gas release and intragranular bubble-size distributions. The results of GRASS-SST predictions for transient fission-gas release during DEH tests are in good agreement with experimental data.

Mechanistic Prediction of Iodine and Cesium Release from LWR Fuel
Mechanistic Prediction of Iodine and Cesium Release from LWR Fuel

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Published: 1983

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A theoretical model (FASTGRASS) has been used for predicting the behavior of fission gas and volatile fission products (VFPs) in UO2-base fuels during steady-state and transient conditions. This model represents an attempt to develop an efficient predictive capability for the full range of possible reactor operating conditions. Fission products released from the fuel are assumed to reach the fuel surface by successively diffusing (via atomic and gas-bubble mobility) from the grains to grain faces and then to the grain edges, where the fission products are released through a network of interconnected tunnels of fission-gas-induced and fabricated porosity.

Mechanistic Prediction of Fission-gas Behavior During In-cell Transient Heating Tests on LWR Fuel Using the GRASS-SST and FASTGRASS Computer Codes
Mechanistic Prediction of Fission-gas Behavior During In-cell Transient Heating Tests on LWR Fuel Using the GRASS-SST and FASTGRASS Computer Codes

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Published: 1979

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GRASS-SST and FASTGRASS are mechanistic computer codes for predicting fission-gas behavior in UO2-base fuels during steady-state and transient conditions. FASTGRASS was developed in order to satisfy the need for a fast-running alternative to GRASS-SST. Althrough based on GRASS-SST, FASTGRASS is approximately an order of magnitude quicker in execution. The GRASS-SST transient analysis has evolved through comparisons of code predictions with the fission-gas release and physical phenomena that occur during reactor operation and transient direct-electrical-heating (DEH) testing of irradiated light-water reactor fuel. The FASTGRASS calculational procedure is described in this paper, along with models of key physical processes included in both FASTGRASS and GRASS-SST. Predictions of fission-gas release obtained from GRASS-SST and FASTGRASS analyses are compared with experimental observations from a series of DEH tests. The major conclusions is that the computer codes should include an improved model for the evolution of the grain-edge porosity.

Mechanistic Prediction of Fission-product Release Under Normal and Accident Conditions
Mechanistic Prediction of Fission-product Release Under Normal and Accident Conditions

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Publisher:

Published: 1983

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A theoretical model has been used for predicting the behavior of fission gas and volatile fission products (VFPs) in UO2-base fuels during steady-state and transient conditions. This model represents an attempt to develop an efficient predictive capability for the full range of possible reactor operating conditions. Fission products released from the fuel are assumed to reach the fuel surface by successively diffusing (via atomic and gas-bubble mobility) from the grains to grain faces and then to the grain edges, where the fission products are released through a network of interconnected tunnels of fission-gas induced and fabricated porosity. The model provides for a multi-region calculation and uses only one size class to characterize a distribution of fission gas bubbles.

Fission Gas Behaviour in Water Reactor Fuels
Fission Gas Behaviour in Water Reactor Fuels

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Publisher: Paris, France : Nuclear Energy Agency, Organisation for Economic Co-operation and Development

Published: 2002

Total Pages: 572

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Communicates the results of an international seminar which reviewed recent progress in the field of fission gas behaviour in light water reactor fuel and sought to improve the models used in computer codes predicting fission gas release. State-of-the-art knowledge is presented for both uranium-oxide and mixed-oxide fuels loaded in water reactors.