1. 99.98%. We find it very easy to operate there and normally maintain based on a twenty minute smoothed value (automatically calculated by COLSS). 2. Combination. We use COLSS (Core Operating Limits Supervisory System) which calculates secondary calorimetric every thirty seconds and primary calorimetric every second. Turbine first stage pressure power is also updated once per second. 3. Don't know. 4. No. 5. No.

Clint Alday

Waterford 3

-----Original Message----- From: pwrrm-bounces@retaqs.com [mailto:pwrrm-bounces@retaqs.com] On Behalf Of WILLETT, JOSEPH E Sent: Wednesday, January 10, 2007 3:01 PM To: pwrrm@retaqs.com Cc: BLESSIE, WILLIAM J Subject: [Pwrrm] Reactor Power Control, Expectaions and Performance

Fort Calhoun Station is currently experiencing 3-5 MWth swings (peak-to-peak) in a one hour period to on our secondary calorimetric calculation. This last outage we replaced both S/Gs and refurbished our FW regulation valves. Prior to this outage our swings were normally 1 MW over 4 hour period. We attempt to keep power at a corporate goal of 1498 MWth (1500 MWth is our rated power level). We do not see these swings on the NI or Delta-T power indications that follow the secondary calorimetric swings.

We have not implemented Appendix K using ultrasonic flow measurement for feedwater as of yet.

Our Question(s)

1) What are other plants goals/expectations for maintaining power level? (=/- MW or goal); How easy is it to maintain?

Is there a band within which you operate?

2) How is your secondary calculation performed? (Averaging Inputs, Instantaneous values, combination) Is it a module

or program on you plant computer or is it an off-line routine?

3) Are your temperature and flow transmitters set specifically for this calculation? (dampening or bias settings)

4) Are any of your control loops (Feedwater) used in the secondary calorimetric calculation?

5) Have you had any issues related to power swings or related to your secondary calorimetric?

J. E. Willett

"Only those who will risk going too far can possibly find out how far one can go."

T.S. Eliot (1888-1965) ---------------------------------------------------- Joseph E. Willett, P.E. Principal Reactor Engineer, Nuclear Operations

E-mail: jwillett@oppd.com mailto:jwillett@oppd.com%20 OR Joseph_Willett@hotmail.com mailto:jwillett@uswest.net%20

Omaha Public Power District Phone: (402) 533-7213 P.O. Box 399 Pager: (402) 561-3899 Ft. Calhoun, NE 68023-0390 FAX: (402) 533-6747 Mail Station: FC-1-1 Plant

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