Based on the way we interpreted the PWROG criteria, this would be a level 3 event due to an unplanned entry into reactivity-related TS that was corrected within the time requirements.

At FCS, reactivity-related Technical Specifications include Shutdown Margin, Core Reactivity, Moderator Temperature Coefficient, Rod Group Alignment Limits, Rod Group Insertion Limits, Rod Position Indication, Rod Position Indication, Physics Tests Exemptions, Linear Heat Rate, Peaking Factors, DNB, and Tilt.

Barton P. Schawe, P.E.

Principal Reactor Engineer

Omaha Public Power District

Tel: 402-533-7211

email: bschawe@oppd.com

From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Adina K Lafrance
Sent: Tuesday, December 15, 2009 10:34 AM
To: RETAQS (pwrrm@retaqs.com)
Subject: [Pwrrm] RM grading: exceeding DNB

I am wondering: how other sites would have classified exceeding DNB margin in reactivity management space.?

Details: The plant had tripped with the TCBs closed when the cold leg temperature was exceeded. The temperature was exceeded for less than 10 seconds. The Technical Specification action statement was met in the specified time. The event was originally graded as an incident.

Also, does your site consider the Tech Spec on DNB a reactivity management TS?

Thank you in advance!

Adina LaFrance

The significant problems we face cannot be solved at the same level of thinking we were at when we created them. -Albert Einstein

Nuclear Analysis & Fuel

Reactor Engineer

Surry Power Station

Email: Adina.K.LaFrance@Dom.com

Phone: 757-365-2658

Pager #: 4290

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