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
At V. C. Summer if it were ever necessary to perform a manual calorimetric our procedure states that feedwater enthalpy is to be based on the enthalpy of saturated liquid from the saturated steam temperature table using feedwater temperature instrumentation.
William H. Bell, PE Chemical Engineer Reactor Engineering V. C. Summer Station South Carolina Electric & Gas Co. 803-345-4389
From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Kenneth R Pike Sent: Friday, October 15, 2010 9:10 AM To: pwrrm@retaqs.com 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
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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Kenneth R Pike