United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2013 > December 13

Event Notification Report for December 13, 2013

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
12/12/2013 - 12/13/2013

** EVENT NUMBERS **


49616 49626

To top of page
Power Reactor Event Number: 49616
Facility: PALO VERDE
Region: 4 State: AZ
Unit: [1] [2] [3]
RX Type: [1] CE,[2] CE,[3] CE
NRC Notified By: JASON HILL
HQ OPS Officer: JEFF ROTTON
Notification Date: 12/08/2013
Notification Time: 10:53 [ET]
Event Date: 12/08/2013
Event Time: 08:00 [MST]
Last Update Date: 12/12/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
MICHAEL VASQUEZ (R4DO)
WILLIAM COOK (R1DO)

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 N 0 Cold Shutdown 0 Cold Shutdown
3 N Y 100 Power Operation 100 Power Operation

Event Text

LOSS OF ASSESSMENT DUE TO TECHNICAL SUPPORT CENTER UNINTERRUPTABLE POWER SUPPLY PLANNED REPLACEMENT

"The following event description is based on information currently available. If through subsequent reviews of this event additional information is identified that is pertinent to this event or alters the information being provided at this time a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.

"At approximately 0800 Mountain Standard Time on December 8, 2013, Palo Verde Nuclear Generating Station (PVNGS) removed the Technical Support Center (TSC) uninterruptable power supply (UPS) from service for a planned replacement. The outage disables the Emergency Response Facility Data Acquisition and Display System (ERFDADS) inside the TSC, remote meteorological data display in the emergency response facilities and control rooms, and transmission of plant data to the Emergency Operations Facility (EOF) and to the NRC's Emergency Response Data System (ERDS). The outage is expected to be completed within five days.

"The TSC and EOF remain functional during the outage. The outage does not affect the availability of normal power to the TSC or back-up power from the TSC diesel generator. Existing telecommunication systems provided for the emergency response organization (ERO) remain functional to provide the ERO within the TSC and EOF the necessary emergency assessment capabilities, as described in the PVNGS Emergency Plan. The ERFDADS system in each of the three unit control rooms and unit satellite TSCs remain functional and are not affected by the TSC UPS outage. Compensatory measures exist within emergency plan implementing procedures to obtain meteorological tower data locally and from the National Weather Service.

"The ERO has been briefed on the effects of the planned TSC UPS outage.

"The NRC Resident Inspector has been informed.

"PVNGS will inform the NRC after the outage has been completed and the functionality of affected equipment has
been restored."

* * * UPDATE FROM DAVE HECKMAN TO HOWIE CROUCH AT 1632 EST ON 12/12/13 * * *

"The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.

"This notification is an update to EN 49616 which provided notification of pre-planned maintenance activities on the Palo Verde Nuclear Generating Station (PVNGS) Technical Support Center (TSC) uninterruptable power supply (UPS) that disabled various Emergency Plan (E-Plan) data systems.

"At approximately 0915 Mountain Standard Time on December 12, 2013, PVNGS restored the affected data systems to service such that the functions of the E-Plan can now be performed without the use of alternate methods.

"The NRC Resident Inspector has been informed. "

Notified R4DO (Werner).

To top of page
Power Reactor Event Number: 49626
Facility: COLUMBIA GENERATING STATION
Region: 4 State: WA
Unit: [2] [ ] [ ]
RX Type: [2] GE-5
NRC Notified By: QUOC VO
HQ OPS Officer: HOWIE CROUCH
Notification Date: 12/12/2013
Notification Time: 12:44 [ET]
Event Date: 12/12/2013
Event Time: 04:36 [PST]
Last Update Date: 12/12/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
GREG WERNER (R4DO)

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

Event Text

BOTH TRAINS OF PRIMARY CONTAINMENT HYDROGEN AND OXYGEN MONITORS OUT OF SERVICE FOR MAINTENANCE

"This notification is being made due to a loss of emergency assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii). At 0436 (PST), on 12/12/2013 the Division 1 sample rack for monitoring primary containment oxygen and hydrogen atmospheric concentrations was removed from service for planned maintenance activities. The Division 1 sample rack is expected to be out of service for 14 hours. The redundant Division 2 sample rack was previously removed from service for maintenance and remains out of service for repairs. Compensatory measures to monitor primary containment for hydrogen and oxygen are available via grab samples using chemistry procedures."

The licensee has notified the NRC Resident Inspector.

Page Last Reviewed/Updated Friday, December 13, 2013
Friday, December 13, 2013