ENS 42820

v t e ENS Event
19:30 Aug 31, 2006
Title	Plant Required Shutdown Due to 'A' and 'B' Edg Inoperable.
Event Description	On August 31, 2006 at 1530 EST Seabrook Station initiated a plant shutdown in accordance with TS 3.8.1.1 Action (f). On August 28, 2006 the Train 'A' Emergency Diesel Generator (EDG) was removed from service for planned maintenance. During the planned maintenance, an emergent issue [suspected diode failure on the control circuitry] was discovered. That required starting the Train 'B' EDG in accordance with the provisions of TS 3.8.1.1 Action (b). During the start of the Train 'B' EDG a voltage control anomaly was discovered that required the Train 'B' EDG to also be declared inoperable. With two EDG's inoperable, TS 3.8.1.1 requires a plant shutdown. This event is reportable pursuant to 10CFR50.72(b)(2)(i) as the initiation of plant shutdown required by the plant's Technical Specifications. The Station currently has all three offsite power supplies and the Supplemental Emergency Power System operable. The licensee is in the process of shutting down and is currently at 60% power at a 20%/hr ramp rate with the intention of entering Mode 3. The licensee notified the NRC Resident Inspector.

ENS 42820 +/-
Where
Seabrook New Hampshire (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
Time - Person (Reporting Time:+-2.92 h-0.122 days <br />-0.0174 weeks <br />-0.004 months <br />)
Opened:	Ken Brown 16:35 Aug 31, 2006
NRC Officer:	Jason Kozal
Last Updated:	Aug 31, 2006
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v • d • e

v t e Emergency Notification System
Seabrook with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2006-08-31T19:30:00 [Table view]
[ENS list for Seabrook]

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