ENS 51246

v t e ENS Event
21:53 Jul 21, 2015
Title	Single Emergency Siren Inadvertent Actuation
Event Description	On 7/21/2015, at approximately 1453 Pacific Daylight Time (PDT), while performing quiet testing of the early warning system, a Pacific Gas and Electric (PG&E) Telecommunications Technician identified that a single emergency response siren was making a full sound output when it should not have been. PG&E Technicians took action and deactivated the single siren. The siren sounded for approximately 1 minute. As a result, this issue is being reported under 10 CFR 50.72(b)(2)(xi) for notifications to other offsite government agencies as the licensee notified the County of San Luis Obispo of the siren deactivation. The San Luis Obispo County Sheriff Watch Commander has been notified of the need to implement alternate means of alert and notification for the areas affected by the deactivation of the single siren. This was accounted for in pre-planning efforts and neither the utility nor 911 received any calls [from the public] related to this matter. The source of the activation signal has not been determined and is being investigated. There was no impact to the health and safety of the public as a result of this event as the offsite response capabilities remain functional with a single siren failure. The site is operating normally with no emergency conditions present. The NRC Resident Inspector has been notified.

ENS 51246 +/-
Where
Diablo Canyon California (NRC Region 4)
Reporting

10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
Time - Person (Reporting Time:+-0.52 h-0.0217 days <br />-0.0031 weeks <br />-7.12296e-4 months <br />)
Opened:	Craig Harvey 21:22 Jul 21, 2015
NRC Officer:	John Shoemaker
Last Updated:	Jul 21, 2015
51246 - NRC Website
v • d • e

v t e Emergency Notification System
Diablo Canyon with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
WEEKMONTHYEAR2018-12-01T08:00:00 [Table view]
[ENS list for Diablo Canyon]

Navigation menu