Mike, We at Callaway have often see evidence of crud release from fuel following control rod exercises. Some others have as well, and I believe that the EPRI RFP, Working Group 1 on AOA/CIPS did a little looking into it, but never resolved what actually caused the crud release (i.e. local clad temperature changes, etc.)
Did RCS activity trend up, or did chemistry samples indicate a spike in Ni, Co or Fe?
Back in our AOA cycles, we would sometimes see an increase in AO (a temporary slight AOA recovery) following these exercises. I can't prove it, but I think it was due to release of Boron with the crud that was dislodged from the fuel.
How do your AO trends for the cycle look, and how do they compare to predictions? Was there an unexpected shift negative early in the cycle (i.e. 4-6 GWD/MTU?)
Jim McInvale 573-676-8247
-----Original Message----- From: respvr-bounces@retaqs.com [mailto:respvr-bounces@retaqs.com] On Behalf Of Michael_Fanguy@dom.com Sent: Friday, February 03, 2006 11:38 AM To: respvr@keffective.com; pwrrm@keffective.com Subject: [Respvr] CIPS / AO Help
Hi everyone,
We recently did our quarterly rod testing on Unit 1 and had some issue. First of all, we insert each bank 12 steps, then withdraw to 235 steps, reset the group demand counters to 230, then insert to our full out position. Following this test, delta flux trended up and peaked about 0.6-07% higher than the start. Tavg also was about .2 deg higher as well. The delta flux response was seen fairly equally on all the NIs and a flux map confirmed incore AO was close to excore. We are not used to seeing this at Surry. I am postulating that a group of rods was partially (~ 2 steps) inserted or that this may possibly be CIPS? Has anyone experience this? Any feedback would be appreciated.
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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