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?
-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
-------------------------------------------------
Joseph E. Willett, P.E.
Principal Reactor Engineer, Nuclear Operations
E-mail: jwillett(a)oppd.com <mailto:jwillett@oppd.com%20> OR
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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