Here is what Duke Energy (Oconee Nuclear Station, Catawba Nuclear Station, & McGuire Nuclear Station) uses:

A positive change in reactivity GREATER THAN OR EQUAL TO:

· 0.05% ΔK/K (50 pcm) beyond intended change or expected tolerance (Mode 2 only) OR

· 0.35% ΔK/K (350 pcm) beyond intended change or expected tolerance (Mode 3, 4, 5, and 6

only)

A negative change in reactivity GREATER THAN OR EQUAL TO 0.15% ΔK/K (150 pcm)

beyond intended change or expected tolerance (Mode 2 only)

Carl

Carl D. Fago

Event Recovery Manager

Oconee Nuclear Station

Duke Energy Carolinas

Phone:  (864) 873-3047

Fax:  (864) 873-3374

Email:  Carl.fago@duke-energy.com

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of ddgoff@aep.com
Sent: Tuesday, December 28, 2010 2:53 PM
To: pwrrm@retaqs.com
Subject: [Pwrrm] values of "x" for PI

What values of "x" are plants using for example criteria 3.9 and 4.6 in the PWR Reactivity Management Performance Indicator PI?

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