[en] To support safety and feasibility evaluations of the proposed repository construction and operation, an assessment is necessary of the potential for inflow of groundwater to the repository excavations from the surrounding saturated rock. This report provides preliminary estimates of groundwater inflow based on simple models appropriate to the current understanding of available data, and shows sensitivities in determining water inflow to uncertain parameters. Steady state inflow to the repository is estimated to be on the order of 100 gpm. An accident case of intersecting a 6 meter diameter drift with a flow top of high hydraulic conductivity (10^-5 m/s) shows an initial inflow of about 3,400 gpm, decreasing to less than 2,000 gpm after one hour. Based on available data, this is considered to be a bounding analysis. The calculated inflow is a value which is routinely dealt with in underground excavations. 7 figs