Secondary- None

In this section of the safety analysis report (SAR) the hydrogeologic design basis is developed to assure consideration in plant design of any potential hazard to the safety-related facilities due to the failure of upstream and downstream water con-trol structures. The areas of review include consideration of flood waves (bores) from severe breaching of upstream dams and the potential loss of water supply due to failure of a downstream dam, domino-type failures of dams, landslides, and effects of sediment deposition and erosion. When data are provided to show that seismic events will not cause failures of up-stream dams that could produce the governing flood at the plant, this section may contain additional data and other information to support a contention that the dams are equivalent to seismic Category I structures and will survive a local-equivalent of the safe shutdown earthquake (SSE) or will survive the operating basis earth-quake (OBE). In such cases the Geotechnical Engineering Section (GES) of HGEB, the Geosciences Branch (GB), and Structural Engineering Branch (SEB), as necessary, will evaluate the data necessary to justify such a classification. GES, GB, and SEB review procedures are outlined in the appropriate geosciences and structural SRP sections. The balance of this SRP section applies to the hydrologic analyses of dam failures or breaches. Where analyses are provided in support of either a conclusion that a probable maxi-mum flood (PMF) should be the design basis flood for a stream, or that a postulated or arbitrarily assumed dam failure flood is the design basis flood for a stream, the areas of review consist of the following: 1. Conservatism of modes of assumed dam failure and deposition of debris downstream