1. Calvert Cliffs has had positive MTC at BOC for about the past fifteen years. We design to get a 0 MTC core at 100% power at BOC. This means that when we reduce power MTC will go back positive, until around a burnup of 7000 or 8000 MWD/MTU. We give the operators placards every 1000 MWD/MTU (about once a month) showing them how many degrees of temperature is worth 1% of reactor power, both at 0% and 100% power. We also put on the placards at what boron concentration the MTC will switch from positive to negative. They get curves of HFP and HZP ITC versus burnup in the curve book too. If we measure an MTC that is too positive at BOC, then we will run with rods inserted enough to drive the MTC down.
2. The current Unit 2 cycle 16 is our first with IFBA. We do not have Hafnium inserts. We check our predicted relative power distributions before we start up, and adjust the Nis based on the predictions. We have been doing that since the early nineties, and it has worked well. - Nancy Cox Reactor Engineer Calvert Cliffs Nuclear Power Plant
-----Original Message----- From: pwrrm-bounces@retaqs.com [mailto:pwrrm-bounces@retaqs.com] On Behalf Of Michael_Fanguy@dom.com Sent: Friday, March 24, 2006 8:43 AM To: pwrrm@keffective.com Subject: [Pwrrm] IFBA Implementation
Hello to all,
I'm looking for some OE on IFBA implementation and have the following questions.
1. Has anyone had experience with a 0 MTC core? How did it affect normal ops at full power or transients? 2. We'll be loading more fresh fuel near the periphery because of IFBA and will be removing Hafnium inserts in front of our NIs, so we're expecting increases in our NI signals. Has anyone had problems with NIs being over-ranged or not being able to adjust NIs to the calorimetric of this type of activity?
Thanks for any help you can provide.
Michael J. Fanguy Nuclear Analysis & Fuel Lead Reactor Engineer Surry Power Station Email: Michael_Fanguy@Dom.com Phone: 757-365-2155 Pager #: 3453
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