Michael,

We often have to replace power range detectors during refueling outages. Turkey Point has a history of water leakage into the excore detector wells resulting in degradation to the excore detectors. We recently changed to titanium housed detectors on the intermediate range and power range detectors to improve the lifetime (more corrosion resistant).

Procedurally we require the Power Range High Flux Trip setpoint to be set at 55% and only after acceptable NIS Calibration of all the detectors (as developed from a flux map at 48%), do we reset the high flux trip setpoint to 108%.

If I can be of any help, please do not hesitate to call me at (305) 246-7327.

Bob Tomonto FPL Turkey Point Reactor Engineering

Michael_Fanguy@do m.com To: respvr@keffective.com, pwrrm@keffective.com Sent by: cc: Robert_A._Wright@dom.com respvr-bounces@re Subject: [Respvr] Question on Power Range NI Replacement taqs.com

01/31/2007 07:38 AM Please respond to "RE Supervisors"

This email is being sent out for North Anna Reactor Engineering.

North Anna (3 loop Westinghouse) is planning to replace a PRNI in their next outage. The question is do other utilities put any special measure in place for startup due to the new detector? Are your Hi Flux Trips extremely low? Is the startup performed with the NI channel in TRIP?

Any feedback would be appreciated. Please send your responses to Robert_A._Wright@dom.com.

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

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