Event Notification Report for March 07, 2004
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/06/2004 - 03/07/2004
EVENT NUMBERS
40574
Power Reactor
Event Number: 40574
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: GRANT FERNSLER
HQ OPS Officer: CHAUNCEY GOULD
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: GRANT FERNSLER
HQ OPS Officer: CHAUNCEY GOULD
Notification Date: 03/07/2004
Notification Time: 09:01 [ET]
Event Date: 03/07/2004
Event Time: 02:01 [EST]
Last Update Date: 03/07/2004
Notification Time: 09:01 [ET]
Event Date: 03/07/2004
Event Time: 02:01 [EST]
Last Update Date: 03/07/2004
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
MOHAMED SHANBAKY (R1)
MOHAMED SHANBAKY (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
START OF THE "A" EMERGENCY DIESEL GENERATOR DURING EMERGENCY SERVICE SUPPLY BUS OUTAGE
At 0201 on 03/07/2004, with Susquehanna Unit 1 in its 13th Refueling and Inspection Outage, the 'A' Emergency Diesel Generator auto started during preparations for a scheduled 1A ESS(Emergency Service Supply) Bus outage. While performing the procedure for removal of the ESS Bus from service, two incorrect fuses were removed. This caused the normal supply breaker to open on sensed undervoltage deenergizing the 1'A' ESS Bus. The alternate breaker also attempted to close as designed, but tripped open immediately due to the sensed undervoltage. With all breakers open, the 'A' Emergency Diesel Generator auto started and loaded onto the bus. All leads had previously been removed from the bus per the procedure.
The 'A' Emergency Diesel Generator is operating as designed and is available to supply Unit 2 'A' ESS Bus if required.
The auto start of a Emergency Diesel Generator is reportable as an event that results in the valid actuation of a system designed to mitigate the consequences of significant events per 10CFR50.72(b)(3)(iv)(A).
The licensee notified the NRC Resident Inspector.
At 0201 on 03/07/2004, with Susquehanna Unit 1 in its 13th Refueling and Inspection Outage, the 'A' Emergency Diesel Generator auto started during preparations for a scheduled 1A ESS(Emergency Service Supply) Bus outage. While performing the procedure for removal of the ESS Bus from service, two incorrect fuses were removed. This caused the normal supply breaker to open on sensed undervoltage deenergizing the 1'A' ESS Bus. The alternate breaker also attempted to close as designed, but tripped open immediately due to the sensed undervoltage. With all breakers open, the 'A' Emergency Diesel Generator auto started and loaded onto the bus. All leads had previously been removed from the bus per the procedure.
The 'A' Emergency Diesel Generator is operating as designed and is available to supply Unit 2 'A' ESS Bus if required.
The auto start of a Emergency Diesel Generator is reportable as an event that results in the valid actuation of a system designed to mitigate the consequences of significant events per 10CFR50.72(b)(3)(iv)(A).
The licensee notified the NRC Resident Inspector.