D. C. Cook response:
Uncertainties are accounted for in the
accident analysis. We should operate the plant at a nominal 100%
power. However...
Our Ops procedure for at-power operation
states that the one-hour average thermal power must not exceed 100%. It
further states that if thermal power exceeds 100%, then a number of actions
must take place, including initiating a condition report per our CAP. The
management expectation concerning this second requirement is that it is
triggered if the ten-minute average exceeds 100%. The pain incumbent
with such a condition report has motivated our operators to drive the plant
such that the ten-minute average remains below 100%. This is exacerbated
by our feedwater control systems that tend to oscillate more than they
did in years past. The end result is that we operate near 99.7%.
David Goff
Reactor Engineer
Donald C. Cook Nuclear Plant
269-465-5901 x1465
Adina K Lafrance <adina.k.lafrance@dom.com>
Sent by: pwrrm@retaqs.com
01/21/2010 08:42 AM
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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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