ENS 45528

v t e ENS Event
15:45 Nov 29, 2009
Title	Trip from Intermediate Range Due to Rod Group Demand Counter Discrepancy
Event Description	During startup physics testing, the reactor operator identified a discrepancy between Group 1 & Group 2 Step Demand Counters for control bank 'B'. Research identified the issue to be associated with failure of a card in the rod control power cabinet. Failure of the card impacts group step counters for control bank 'B', control bank 'D' and shutdown bank 'B.' Inoperability of more than one group step counter per bank placed Unit 2 in a 6-hour clock to hot shutdown as of 0808 hrs 29 November 2009. Consequently, at 1045 hrs, the decision was made to trip Unit 2 reactor. The decision was based on time required to make repairs, complete post maintenance testing requirements, and maintaining proper control of reactivity. All systems functioned as required on the trip and initiation of any auxiliary or emergency systems was not required. Current heat removal is via normal plant alignment following refueling outage activities: steam generator blowdown, main feedwater, and steam generator PORV. All control rods fully inserted on the manual trip. The licensee notified the NRC Resident Inspector.

ENS 45528 +/-
Where
Surry Virginia (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.23 h-0.0929 days <br />-0.0133 weeks <br />-0.00305 months <br />)
Opened:	Geoffrey Hill 13:31 Nov 29, 2009
NRC Officer:	Pete Snyder
Last Updated:	Nov 29, 2009
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v • d • e

v t e Emergency Notification System
Surry with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
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