Oconee Nuclear Station operates at 100%FP as indicated. The uncertainty in power is accounted for in the safety analysis assumptions. The license condition for 2568 MWTh is interpreted as being the as-indicated condition (which I believe is consistent with standard T.S., too … that the value in the T.S. is the as-indicated condition and the appropriate analyses take into account uncertainties when ensuring the as-indicated value is safe.)

Carl

Carl D. Fago

Reactor Engineering Supervisor

Oconee Nuclear Station

Duke Energy Carolinas

Phone:  (864) 873-3047

Fax:  (864) 873-3374

Email:  Carl.fago@duke-energy.com

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Adina K Lafrance
Sent: Thursday, January 21, 2010 8:43 AM
To: RETAQS (pwrrm@retaqs.com)
Subject: [Pwrrm] Measured power and uncertanties

 Surry is trying to answer a question this morning regarding power level indications and uncertainties. 

We are stating that within a certain confidence level, that the calorimetric calculation will produce a reactor power output (at RTP) from 98.8 to 101.2% with the rightly calibrated process instrumentation in the calorimetric program (App K).  Half the time the operating power will be above 100%, half the time it will be below 100%.  The opposing opinion is that if we have a 1.2% RTP uncertainty that we operate at or below 98.8% so as to not exceed RTP.  The uncertainties in question relate to the plant computer-none of the redundant indications indicate higher than RTP (most notably delta Ts).  It is also noted that we were told that no other site operates the way we are with regard to uncertainties. 

Can you please tell us how your site operates with regard to uncertainties and your RTP? 

Thank you in advance. 

Adina LaFrance

The significant problems we face cannot be solved at the same level of thinking we were at when we created them.  -Albert Einstein

Nuclear Analysis & Fuel

Reactor Engineer

Surry Power Station

Email: Adina.K.LaFrance@Dom.com

Phone: 757-365-2658

Pager #: 4290

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