Beaver Valley Response
In 2008, while at 15% reactor power, Operators were transferring the EH control to First Stage Pressure Feedback Mode and experienced a plant transient that resulted in exceeding the low RCS temperature and pressure DNB Tech Spec limits. The Tech Spec action statement was exited within the 2 hour time limit (20 minutes). This was classified as a Level 3 reactivity event. - operation beyond Tech Spec limits but corrected within Tech Spec time requirement. Therefore, yes we consider the DNB Tech Spec a reactivity management TS.
Anthony (A.R.) Burger Supervisor, Reactor Engineering FENOC - Beaver Valley Power Station Phone: (724) 682-4108 Cell: (724) 601-3224 FAX: (724) 682-4250 Email: aburger@firstenergycorp.com
Adina K Lafrance <adina.k.lafrance @dom.com> To Sent by: "RETAQS (pwrrm@retaqs.com)" pwrrm@retaqs.com pwrrm@retaqs.com cc
12/15/2009 11:34 Subject AM [Pwrrm] RM grading: exceeding DNB
Please respond to PWR Reactivity Management <pwrrm@retaqs.com >
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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