Diablo Canyon Unit's "x" values for 3.9 and 4.6 are the same as the Dominion Units.

3.9 Unplanned reactivity change caused by equipment problem or personnel error. * Reactor power change ≥ 0.5% RTP when > 5% RTP * Reactivity change ≥ 350 pcm when ≤ 5% RTP

4.6. Unplanned reactivity change caused by equipment problem or personnel error. * Reactor power change < 0.5% RTP when >5% RTP * Reactivity change < 350 pcm and > 150 pcm when ≤ 5% RTP

Ken Kargol DCPP Reactor Engineering 805 545-4075

________________________________

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Charlene N Chotalal Sent: Wednesday, December 29, 2010 5:24 AM To: PWR Reactivity Management Subject: Re: [Pwrrm] values of "x" for PI

This is what we use for the Dominion Units (Surry, Kewanee, North Anna and Millstone):

3.9 Unplanned Reactivity Change Caused by Equipment Problem or Personnel Error

* Reactor Power Change >0.5% RTP When >5% RTP

* Reactivity Change >350 pcm When <5% RTP

4.6 Unplanned Reactivity Change Caused by Equipment Problem or Personnel Error

* Reactor Power Change < 0.5% RTP When >5% RTP

* Reactivity Change <350 pcm and >150 pcm When < 5% RTP

Charlene Chotalal

Lead Reactor Engineer

Nuclear Analysis & Fuels, Surry Power Station

Dominion Generation

Phone: 757-365-2819; Fax: 757-365-2750

E-mail: Charlene.N.Chotalal @dom.com

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Fago, Carl D Sent: Wednesday, December 29, 2010 7:53 AM To: PWR Reactivity Management Subject: Re: [Pwrrm] values of "x" for PI

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

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