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This report describes preliminary results of comparison disassembly calculations for a representative LMFBR model (2100i voided core) and arbitrary accident conditions. The analytic 1 methods employed were the computer programs: FX2-P00L, PAD,and VENUS-II. Calculations were performed at Argonne National Laboratory, Brigham Young University,and Los Alamos Scientific Laboratory. The calculated fission energy depositions are in good agreement, as are measures of the destructive potential of the excursions, kinetic energy, and work. However, in some cases the resulting fuel temperatures are substantially divergent. Differences in the fission energy deposition appear to be attributable to residual inconsistencies in specifying the comparison cases. In contrast, temperature discrepancies probably stem from basic differences in the energy partition models inherent in the codes. Although explanations of the discrepancies are being pursued, the preliminary results indicate that all three computational methods provide a consistent, global characterization of the contrived disassembly accident. N O T I C C P i i i tepoit was prepared a i i n account of work faoosored by the t inted Suits G o m m e n t Kbthei the United States not the United S u t a Energy Uneven snd Deiriopment AdnarauratHMi. * " an> of their employees, no! any or their conltactoi). subcontractor!, ot thrit employees, nates any warranty, express or implied, or a a u i e i any legal Kaodilf or mpoiHfbiJtt> for the accuracy, tumpIctenfti or usefulness of any information, apparatus, product ot proccaa diadoted. ot represents that its uat urould not inrtinie privately owned rchts.