[en] NUSCO has performed a sensitivity study of steam generator secondary modeling for loss of all feedwater coincident with the loss of offsite power. One, two, and three volume steam generator secondary models were used in conjunction with a common primary side nodalization in a two loop model. the importance of flow area of the secondary side for this incident has been investigated, along with a comparison of two loop and one loop models. Finally, the choice of equilibrium or non-equilibrium pressurizer models was assessed