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 15^th.

       

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?

 

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

-What procedure or guidance is provided to your operators?

-Can I get a copy of the procedure?

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?

-What is the frequency of the calculations utilized? (1 sec, 1 minute, 10 minutes 30 minutes, etc…)?

-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...)

-What is there BASIS for the calculation? Is there supporting documentation? What is it?

-What frequency do the operators control to? (2 minute average, 10 minute average, 30 minute average, etc….) 

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?

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

J. E. Willett

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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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