Hi, Ken!

The procedures at D. C. Cook each have a lookup table based on variable FW temperature and an assumed FW pressure of 930 psig (Unit 1) and 1000 psig (Unit 2).

We have an engineering evaluation addressing the insensitivity of enthalpy to varying FW pressure in the range 650 psig - 1010 psig (Unit 1) and 650 psig - 1050 psig (Unit 2). The assumed FW pressures are an approximate average of the nominal full power and 15% power FW pressures.

Differences are due to the two different secondary plants.

David Goff
Reactor Engineer
Donald C. Cook Nuclear Plant
269-465-5901 x1465

"Kenneth R Pike" <kpike01@comcast.net>
Sent by: pwrrm@retaqs.com

10/15/2010 09:09 AM

Please respond to
Kenneth R Pike <kpike01@comcast.net>; Please respond to
PWR Reactivity Management <pwrrm@retaqs.com>

To	<pwrrm@retaqs.com>
cc
Subject	[Pwrrm] Manual calorimetric Feedwater Enthalpy determination

What method do you use to assign an Enthalpy to Feedwater, given FW Temperature and S/G pressure when using your backup Manual calculation?

Do you use compressed liquid steam tables at a single pressure and iterate on the temperature to assign a value, or iterate on both temp and pressure.

If you use a single value of pressure, is it nominal full power S/G press or something different?

Ken Pike
(610) 277-8991 Ext.253_______________________________________________

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