ENS 45738

v t e ENS Event
04:15 Feb 26, 2010
Title	Discovery of an After-The-Fact Unusual Event
Event Description	This is a one-hour report for the discovery of a condition that briefly met the emergency action level (EAL) for an Unusual Event but did not warrant declaration of an emergency classification. A detailed review of the conditions that existed at approximately 2315 EST on February 25 during a winter storm determined that the winds reached a speed of approximately 94 miles per hour for approximately four seconds. This wind speed exceeded the EAL value of greater than or equal to 90 miles per hour. However, because the condition cleared within approximately four seconds, a declaration of an Unusual Event would not have been warranted. The information examined during this detailed review was not the wind speed indication displayed in the control room and used by the operators for evaluating Emergency Action Levels. The additional analysis, which was performed following the winter storm, used data obtained by Engineering. The control room indication remained below 90 miles per hour at all times. This event is a one-hour report based on the guidance in NUREG-1022 for a condition that met an emergency plan EAL and the basis for the emergency classification no longer existed at the time of discovery. The [NRC] Resident Inspector has been informed of this notification and good neighbor notifications will be made to [the State of] New Hampshire and Massachusetts.

ENS 45738 +/-
Where
Seabrook New Hampshire (NRC Region 1)
Reporting
Emergency class:	Unusual Event
Other Unspec Reqmnt
Time - Person (Reporting Time:+108.42 h4.518 days <br />0.645 weeks <br />0.149 months <br />)
Opened:	Matthew Forrest 16:40 Mar 2, 2010
NRC Officer:	Dong Park
Last Updated:	Mar 2, 2010
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v • d • e

v t e Emergency Notification System
Seabrook with Other Unspec Reqmnt
WEEKMONTHYEAR2010-02-26T04:15:00 [Table view]
[ENS list for Seabrook]

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