Surry is planning on implementing Westinghouse TB-00-003-R0 (Stationary/Movable Gripper Blocking Diodes) in our next outages. For plants who have removed blocking diodes from Rod Control, did you see increases in rod drop times? Were they in order with the 10 msec stated in the Tech Bulletin? If not what was the increase?

Michael J. Fanguy Nuclear Analysis & Fuel Lead Reactor Engineer Surry Power Station Email: Michael.Fanguy@Dom.com Phone: 757-365-2155 Pager #: 3453

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