United States Nuclear Regulatory Commission - Protecting People and the Environment

Event Notification Report for June 13, 2011

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
06/10/2011 - 06/13/2011

** EVENT NUMBERS **


46946 46947

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Power Reactor Event Number: 46946
Facility: INDIAN POINT
Region: 1 State: NY
Unit: [2] [3] [ ]
RX Type: [2] W-4-LP,[3] W-4-LP
NRC Notified By: RICHARD ALEXANDER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 06/10/2011
Notification Time: 15:19 [ET]
Event Date: 06/10/2011
Event Time: 11:45 [EDT]
Last Update Date: 06/10/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
JOHN ROGGE (R1DO)

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

Event Text

TECHNICAL SUPPORT CENTER NON-FUNCTIONAL DUE TO MALFUNCTIONING VENTILATION SYSTEM

"The Technical Support Center (TSC) has been rendered non-functional due to a malfunctioning ventilation system. Investigation into elevated TSC temperature led to the discovery of a malfunctioning compressor. Repairs to TSC ventilation have commenced.

"Per Emergency Plan Procedure IP-EP-220, an alternate location for the TSC staff has been identified and communicated to the TSC staff if the Emergency Director determines that the TSC is uninhabitable during an event."

The licensee notified the State of New York Public Service Commission. The licensee will notify the NRC Resident Inspector.

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Power Reactor Event Number: 46947
Facility: OCONEE
Region: 2 State: SC
Unit: [1] [ ] [ ]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: SANDRA SEVERANCE
HQ OPS Officer: BILL HUFFMAN
Notification Date: 06/10/2011
Notification Time: 15:55 [ET]
Event Date: 06/10/2011
Event Time: 08:02 [EDT]
Last Update Date: 06/10/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
STEVEN RUDISAIL (R2DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 50 Power Operation 50 Power Operation

Event Text

ALL FOUR CHANNELS OF RPS OVERPOWER FLUX/FLOW IMBALANCE PROTECTION TRIP DISCOVERED TO BE INOPERABLE

"Event: During startup of Unit 1 on June 10, 2011, after increasing power to approximately 50 percent, it was noticed that power range nuclear instrumentation was not responding adequately to power imbalance differences. At 0802 EDT, all four channels of Reactor Protective System instrumentation were declared inoperable. TS 3.3.1., Reactor Protective System (RPS) instrumentation, Condition A, B, and C were entered. RPS Channel D was placed in trip per Condition A. Trouble shooting efforts were immediately initiated.

"Initial Safety Significance: This issue constitutes a loss of safety function because the nuclear overpower flux/flow imbalance trip function of RPS was not operable.

"Corrective Action(s): Trouble-shooting commenced. A wiring error was identified that affected all four RPS channels. At this time, all four channels have been restored to operability. All conditions of TS 3.3.1, Conditions A, B, and C have been exited as of 1438 EDT hours when all four channels of RPS were restored."

The licensee stated that the wiring error is associated with a modification package that was completed during the recent refueling outage.

The licensee has notified the NRC Resident Inspector.

Page Last Reviewed/Updated Thursday, March 29, 2012
Thursday, March 29, 2012