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

"WILLETT, JOSEPH E" <jwillett@oppd.co To m> respvr@retaqs.com, Sent by: pwrrm@retaqs.com respvr-bounces@re cc taqs.com Subject [Respvr] Secondary Calorimetric 02/06/2007 03:04 Feedback Needed (PWR) - Heat PM Balance (BWR)

Please respond to RE Supervisors <respvr@retaqs.co m>

To All,

I apologize, this is a repeat Request, but the HIT Team I’m working on needs more specific information regarding secondary calorimetric calculations. I could use a reply by February 15th.

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 Main 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? We try to maintain 100.00% power shift average. Pretty easy but I'm not an operator.

-Is there a band within which you operate? What is it? Is it maintained?

No we operate at 100.00%.

What procedure or guidance is provided to your operators?

Here is our procedure.

-Can I get a copy of the procedure? Here it is.

(See attached file: SU-PROC-000-1-OPT-RX-001.pdf)

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

-Is it a module or program on your plant computer or is it an off-line routine?

The calorimetric runs every second on the Plant Computer System

-What is the frequency of the calculations utilized? (1 sec, 1 minute, 10 minutes 30 minutes, etc…)?We calculate flow corrections every 5 seconds. We use 5 second average FW temperatures, constant FW pressure. After the flow is calculated, we calculate a 5 minute filtered average feed flow which is then used as the flow in the calorimetric. We use 1 minute average steam flows and 5 second average steam pressures.

-What is the frequency of the scan rate for input parameters utilized? (1 sec, 1 minute, 10 minutes 30 minutes, etc…)? Does it vary by parameter? Are they averaged, and for how long? (30 seconds, 60 seconds, etc...). We use 5 second average inputs, then average flows for 1 minute or 5 minutes for feedflow. We calculate an 8 hour shift average.

-What is there BASIS for the calculation? Is there supporting documentation? What is it? There is extensive basis for the calorimetric including uncertainties and methods of calculating flows, etc.

-What frequency do the operators control to? (2 minute average, 10 minute average, 30 minute average, etc….) When using Feed flow we control to the value obtained from the filtered average feed flow. When using Steam we use a 10-minute average. We verify the shift average does not exceed 100.00%

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

The only bias settings we have on both Steam and Feed is that we calibrate out the Static Pressure Zero Effect (SPZE).

4) Are any of your control loops (Feedwater) used in the secondary calorimetric calculation? I would say protection. They feed into steam flow/feed flow mismatch.

5) Have you had any issues related to power swings or related to your secondary calorimetric? When we place a polisher in service we get a small perturbation that hangs around for about 30 minutes. This is because of the 5 minute filter on feed flow. We use the 10 minute average on steam flow for smoothing.

6) Who has ownership/control of your program/logic? System Engineering, Design Engineering, Operations, Reactor Engineering or some other department? Reactor Engineering owns the calorimetirc.

J. E. Willett

----------------------------------------------------

Joseph E. Willett, P.E.

Principal Reactor Engineer-Fuel

Nuclear Operations Division

E-mail: jwillett@oppd.com

Omaha Public Power District Phone: (402) 533-7213

P.O. Box 99 Pager: (402) 561-3899

Ft. Calhoun, NE 68023-0390 FAX: (402) 533-6747

Mail Station: FC-1-1 Plant

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