Studies of prefailure fuel extrusion in metal fuel pins with EXTRUS
A SAS4A module, EXTRUS, available in a special version of SAS4A, has been prepared to deal with prefailure metal fuel extrusion in a slow TOP accident, as an alternative to the PINACLE module. Results of calculation of prefailure fuel extrusion for the TREAT M4 experiment as calculated in SAS4A by PINACLE and by EXTRUS have been compared. The questions of the importance for metal fuel of inpin axial fuel distribution on fuel motion reactivity effects and of dynamic effects on prefailure molten fuel extrusion have been investigated using the PINACLE and EXTRUS modules of SAS4A. Calculations with the EXTRUS module have been performed for the 1.9% burnup pin in the F2 M5 TREAT experiment to try to understand the low molten fuel extrusion of only 1 to 2% observed. The M6 experiment showed extrusion of 3 to 5%, considerably larger than that in M5. Fuel clad failure conditions and prefailure fuel extrusion for prototypical SAFR metal fuel pins have been investigated for a programmed power history typical of a .1$/sec transient overpower accident.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 714106
- Report Number(s):
- ANL-IFR--85; ON: TI88026517
- Country of Publication:
- United States
- Language:
- English
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