Waterford is a CE-NSSS and we have defeated it for reactivity management concerns - it is turned off except for following a Reactor Power Cutback when an immediate operator action is to turn it on.

Reactor Power Cutback is dropping the lead group or two lead groups on a turbine trip or feedwater pump trip - allows us to remain at a reduced power. Last used in February 2004 for a turbine trip which allowed us to remain at >20% - we were critical that entire cycle although not quite a breaker-to-breaker in the normal sense.

Clint Alday Waterford 3

-----Original Message----- From: respvr-bounces@retaqs.com [mailto:respvr-bounces@retaqs.com] On Behalf Of Hugh_E_McKenney@dom.com Sent: Monday, February 06, 2006 12:29 PM To: RE Supervisors Subject: [Respvr] Westinghouse NSSS Auto Rod Withdrawal Question

How many of us with Westinghouse NSSS systems have defeated the Auto Rod withdrawal function (NOT Auto Insertion)???

For those that have defeated this function was it driven by reactivity management concerns or Power Uprate issues???

Thanks in advance for your responses

Regards

Hugh McKenney Dominion Resources Services, Inc. Reactor Engineering Supervisor Phone: 8-759-2359 or 860 447-1791 x2359 Email: Hugh_E_McKenney@Dom.com

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