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Event Notification Report for August 29, 2013

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
08/28/2013 - 08/29/2013

** EVENT NUMBERS **


49311 49312

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Power Reactor Event Number: 49311
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: JOHN SHOEMAKER
Notification Date: 08/28/2013
Notification Time: 03:20 [ET]
Event Date: 08/28/2013
Event Time: 01:48 [EDT]
Last Update Date: 08/28/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
ANTHONY MASTERS (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 SYSTEM 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 08/28/13 in the Technical Support Center (TSC) HVAC.

"The work includes performance of planned outside air intake valve electrical troubleshooting. The planned work activity duration is approximately 16 hours.

"If an emergency is declared requiring TSC activation during period, the TSC will be staffed and activated using existing emergency planning procedure 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 Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency.

"The NRC Resident Inspector has been notified.

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

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Power Reactor Event Number: 49312
Facility: MONTICELLO
Region: 3 State: MN
Unit: [1] [ ] [ ]
RX Type: [1] GE-3
NRC Notified By: ANGEL BRAY
HQ OPS Officer: JOHN SHOEMAKER
Notification Date: 08/28/2013
Notification Time: 05:16 [ET]
Event Date: 08/27/2013
Event Time: 21:52 [CDT]
Last Update Date: 08/28/2013
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
RICHARD SKOKOWSKI (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 94 Power Operation

Event Text

RECIRC PUMP RUNBACK AND POWER REDUCTION

"On August 27, 2013 at 2152 CDT, Monticello Nuclear Generating Plant (MNGP) experienced a runback of [the] 'B' Recirc pump from 87% speed to 71% speed. Operators took action to lock [the] 'B Recirc pump scoop tube. This runback resulted in a power reduction from 100% to 94% RTP [Rated Thermal Power]. With the resultant mismatch between total jet pump flows of the two loops greater than required limits, should a LOCA [Loss of Coolant Accident] occur, the core flow coastdown and resultant core response may not be bounded by the LOCA analyses. It has been determined that this is an unanalyzed condition as defined by 10CFR50.72(b)(3)(ii)(8).

"At 0121 CST on August 28, 2013, MNGP completed reducing power to 88% using 'A' Recirc pump to match total jet pump flows and [the plant] is no longer in an unanalyzed condition. The 'B' Recirc scoop tube remains locked pending investigation."

The licensee has notified the NRC Resident Inspector.

Page Last Reviewed/Updated Thursday, August 29, 2013
Thursday, August 29, 2013