Power Reactor Event Number: 40891
Facility: SALEM
Region: 1 State: NJ
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: S. SAUER
HQ OPS Officer: ARLON COSTA
Notification Date: 07/22/2004
Notification Time: 13:15 [ET]
Event Date: 07/22/2004
Event Time: 07:10 [EDT]
Last Update Date: 07/22/2004
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
JOHN KINNEMAN (R1)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 23 Power Operation 23 Power Operation

Event Text

LOSS OF POWER TO PRIMARY AND BACKUP OFFSITE SIREN SYSTEM

"At 0710 hrs on 7/22/04 it was discovered by the Salem County 911 Center dispatcher that the primary and backup Alert Notification System (offsite siren system) activation controllers (computers) had lost power. The Salem County Siren computers are the activation controllers for all 34 offsite sirens located in the New Jersey portion of tile 10-mile EPZ. The 37 Delaware Sirens wore not affected. As per instructions, siren technicians were notified at 0748 hours and responded to the 911 Center at 0815 hours. Power was restored to the primary computer at 0835 hours. Subsequent investigation and troubleshooting has determined the following:

"Exact time of power loss is unknown. Last know/verified computer availability was at 1104 on 7/21/04 when a biweekly siren test was successfully completed. An automatic siren poll scheduled for 0645 on 7/22 did not occur which indicates that the loss of power occurred sometime between 1104 on 7/21 and 0645 on 7/22/04.

"Cause of loss of power was determined to be a failed UPS unit that both the primary and backup siren computers were powered from. The failed UPS was removed and primary computer re-powered directly from 911-center normal 120-volt house power. A siren poll was done and. The siren system was declared back in service at 0835 hours on 7/22/04.

"Two separate UPS units will be connected to the Siren activation computers by the end of day today, 7/22/04."

The licensee notified State of New Jersey and the NRC Resident Inspector.