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Event Notification Report for March 26, 2014

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
03/25/2014 - 03/26/2014

** EVENT NUMBERS **


49956 49958

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Power Reactor Event Number: 49956
Facility: CATAWBA
Region: 2 State: SC
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: THOMAS GARRISON
HQ OPS Officer: JEFF ROTTON
Notification Date: 03/24/2014
Notification Time: 21:30 [ET]
Event Date: 03/24/2014
Event Time: 23:00 [EDT]
Last Update Date: 03/25/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
SCOTT SHAEFFER (R2DO)

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 100 Power Operation 100 Power Operation

Event Text

TECHNICAL SUPPORT CENTER VENTILATION OUT OF SERVICE DUE TO PLANNED MAINTENANCE

"This is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 03/24/14 starting at approximately 2300 [EDT] to the Technical Support Center (TSC) ventilation system.

"The work includes performance of planned carbon bed filter sample. The planned work activity duration is approximately 5 hours.

"If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures.

"The NRC Resident Inspector has been notified.

"This event poses no threat to the public or station employees."

* * * UPDATE FROM THOMAS GARRISON TO HOWIE CROUCH AT 0325 EDT ON 3/25/14 * * *

The TSC was returned to service at 0325 EDT on 3/25/14. The licensee will be notifying the NRC Resident Inspector.

Notified R2DO (Shaeffer).

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Power Reactor Event Number: 49958
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [ ] [ ]
RX Type: [1] GE-6
NRC Notified By: DAN HUNT
HQ OPS Officer: DONALD NORWOOD
Notification Date: 03/25/2014
Notification Time: 22:44 [ET]
Event Date: 03/25/2014
Event Time: 19:42 [CDT]
Last Update Date: 03/25/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
BILLY DICKSON (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 M/R Y 46 Power Operation 0 Hot Shutdown

Event Text

MANUAL REACTOR SCRAM DUE TO LOSS OF CONDENSER VACUUM

"The plant was stable at 85 percent power when off-gas flow started lowering. The operating crew entered the loss of vacuum off-normal procedure and commenced an emergency power reduction to attempt to slow/halt the loss of vacuum while attempting various prescribed actions in the off-normal procedure. When vacuum reached 24 in. Hg, a rapid plant shutdown was performed as prescribed in the off-normal procedure. Power was at 46 percent when a rapid plant shutdown was commenced with the mode switch placed in shutdown at 1942 CDT. All control rods fully inserted on the scram, no emergency core cooling system injected or was required, no safety/relief valve(s) lifted and all systems responded as expected on the scram. The plant will remain in mode 3 with normal makeup from the feedwater system and pressure control on the turbine bypass valves with the main condenser available as a heat sink. All vital and non-vital electrical busses are powered from reserve off-site sources and no emergency diesel generators started on the scram. The cause of the loss of vacuum is under investigation."

The licensee notified the NRC Resident Inspector.

Page Last Reviewed/Updated Wednesday, May 14, 2014
Wednesday, May 14, 2014