From Oconee...

N/A for AREVA B11 or HTP fuel.
Non-corrected value. Though we use the B-10 sample results to assist in monitoring the anomaly.
Yes. Our procedure has a review criteria of ~350 pcm and an acceptance criteria of ~500 pcm (the procedure uses ppmB to measure the anomaly so that’s why the “~”). We’re expected to enter results not meeting review or acceptance criteria into our corrective action program. The CAP response would be commensurate with the failure (trending, apparent cause, root cause, etc.)

Carl

Carl D. Fago

Reactor Engineering Supervisor

Oconee Nuclear Station

Duke Energy Carolinas

Phone: (864) 885-3047

Fax: (864) 885-3374

Email: cdfago@duke-energy.com

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Adina.K.Lafrance@dom.com
Sent: Friday, January 16, 2009 7:51 AM
To: pwrrm@retaqs.com
Subject: [Pwrrm] Reactivity anomaly calculation

1)
Surry uses IFBA fuel. Core modeling is performed using the CASMO-4/SIMULATE-3 computer codes. In making comparisons between measured and predicted boron concentrations (corrected for B-10, power, xenon, rod position, and RCS temperature), we notice a tendency to for the core models to underpredict the measured critical boron between 2 and 4 GWD/MTU by 10-20 ppm (about 80-160 pcm) more than at other times in life (such as at BOC equilibrium xenon or between MOC and EOC). Have you observed this tendency at your plant?

2)
For the monthly reactivity anomaly calculation, is a B-10 corrected value used to meet Tech Spec requirements, or is the non-corrected value used? (Surry uses the non-corrected value)

3)
Does your anomaly procedure have a threshold (such as +/-500 pcm) at which the anomaly would be documented in the corrective action system?

Adina LaFrance

It's a healthy thing now and then to hang a question mark on the things you have long taken for granted. -Betrand Russell

Nuclear Analysis & Fuel
Reactor Engineer
Surry Power Station
Email: Adina.K.LaFrance@Dom.com
Phone: 757-365-2658
Pager #: 4290

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