05000302/LER-1990-005, Provides Details of Resolution Util Will Pursue Re Reactor Bldg Flooding Detailed in Encl LER 90-005.Mod Will Be Installed to Add Alarm in Main Control Room to Indicate When Flood Level Reaches Point & Operator Action Begins

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• 05000302/LER-1990-005, :on 900329,util Found Operating Outside Design Basis.Caused by Oversight of A/E Performing Original RB Flood Level Calculation.Rb Instrumentation & Equipment Relocated to Higher Elevation