Mechanistic prediction of transient fission-gas release from LWR fuel. [UO/sub 2/]

Conference · Sun Jan 01 04:00:00 EST 1978

OSTI ID:6865297

Rest, J.; Gehl, S. M.

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.

• Research Organization: Argonne National Lab., Ill. (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6865297
• Report Number(s): CONF-780342--1
• Country of Publication: United States
• Language: English

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