Power Reactor

Event Number: 44154

Facility: HOPE CREEK
Region: 1 State: NJ
Unit: [1] [ ] [ ]
RX Type: [1] GE-4
NRC Notified By: MICHAEL REED
HQ OPS Officer: JASON KOZAL

Notification Date: 04/22/2008
Notification Time: 12:58 [ET]
Event Date: 04/22/2008
Event Time: 08:41 [EDT]
Last Update Date: 04/22/2008

Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)( v)(D) - ACCIDENT MITIGATION

Person (Organization) :
JOHN WHITE (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

Event Text

LOSS OF SAFETY FUNCTION DUE TO BLOWN FUSE

"At 0841, the Control Room received an alarm indicating an issue with the CD481 1E inverter. Upon walkdown, it was noted that the main power fuse had failed and the inverter channel was powered from a backup non-1E AC source. IAW HCGS procedures, the C EDG was declared inoperable because it would not start in response to a LOCA signal. Electrical output of the CD 481 inverter was available through the event and no transient or actuations occurred.

"All require Technical Specification surveillance tests for TS 3.8.1 were completed within the required time-frame.

"Additional equipment that was tagged for scheduled maintenance included the D EDG which is currently in an outage window and inoperable. This resulted in 2 of the 4 HCGS EDGs inoperable. With the C and D EDGs inoperable, both Control Room Emergency Filtration Systems (CREF) would be without diesel back-up power supplies in the event of a LOCA and thus inoperable. With no operable CREF systems, Technical specification 3.0.3 applies. A loss of both CREF systems would constitute a loss of function of a safety system designed to mitigate the consequences of an accident (10 CFR50.72(b)( 3)(v)(D)) .

"Replacement of the CD481 1E inverter main power fuse and assessment of inverter function was completed at 10:36. The inverter was placed back in its normal alignment. All related Technical Specification equipment is operable with the exception of the D EDG, which remains in the scheduled maintenance outage. "

The licensee notified the NRC Resident Inspector