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Event Notification Report for March 10, 2015

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
03/09/2015 - 03/10/2015

** EVENT NUMBERS **


50873 50874

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Power Reactor Event Number: 50873
Facility: MILLSTONE
Region: 1 State: CT
Unit: [ ] [2] [ ]
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: NICK KOSTOPOULOS
HQ OPS Officer: JEFF HERRERA
Notification Date: 03/09/2015
Notification Time: 13:10 [ET]
Event Date: 03/09/2015
Event Time: 09:57 [EDT]
Last Update Date: 03/09/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
WILLIAM COOK (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

Event Text

MILLSTONE UNIT 2 SITE STACK RADIATION MONITOR SAMPLE PUMP TRIP

On March 9, 2015 at 0957 EDT, the Millstone Site Stack Radiation Monitor RM 8169 sample pump tripped. This resulted in a loss of assessment capability. Compensatory measures have been put in place to provide chemistry sampling. The cause is under investigation and the Instrument & Controls Department is troubleshooting and repairing the sample pump.

The NRC Resident Inspector, Connecticut Department of Environmental Protection, and the Town of Waterford have been notified.

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Power Reactor Event Number: 50874
Facility: FERMI
Region: 3 State: MI
Unit: [2] [ ] [ ]
RX Type: [2] GE-4
NRC Notified By: S. REITH
HQ OPS Officer: JEFF HERRERA
Notification Date: 03/09/2015
Notification Time: 17:38 [ET]
Event Date: 03/09/2015
Event Time: 15:21 [EDT]
Last Update Date: 03/10/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(i) - PLANT S/D REQD BY TS
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
STEVE ORTH (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 N Y 100 Power Operation 83 Power Operation

Event Text

TECH SPEC REQUIRED SHUTDOWN DUE TO SWING BUS AUTOMATIC THROWOVER FAILURE

"While performing a Technical Specification surveillance functional test of the [Low Pressure Coolant Injection] LPCI swing bus automatic throwover scheme, the throwover function failed, rendering LPCI Loop Select inoperable. Time of [the] event was 1521 [EDT]. Inoperable LPCI Loop Select results in entry into Tech Spec 3.0.3. Power reduction activities were briefed and power reduction commenced at 1615. Maintenance is currently implementing a contingency work order to correct the auto throwover failure.

"This report is made pursuant to 10 CFR 50.72(b)(2)(i), initiation of plant shutdown required by the plant's Technical Specifications; and 10 CFR 50.72(b)(3)(v)(D), an event or condition that could have prevented the fulfillment of the safety function of systems needed to mitigate the consequences of an accident."

Offsite and Emergency power remain available.

The NRC Resident Inspector was notified.

* * * UPDATE FROM KELLEY BELLENKY TO DANIEL MILLS AT 0123 EDT ON 3/10/2015 * * *

"On March 9, 2015, at approximately 1521 [EDT], while performing a functional test of the LPCI swing bus automatic throwover scheme, the throwover function failed, rendering LPCI loop select inoperable. Tech Spec 3.0.3 was entered and power reduction commenced at 1615 [EDT]. Power was lowered to approximately 80%. Maintenance led a troubleshooting process that found and corrected the equipment problem. At approximately 2311 [EDT], the limiting condition for operating was cleared and LPCI loop selected was declared operable. Tech Spec 3.0.3 was exited at that time."

The licensee notified the NRC Resident Inspector. The plant has returned to 100% power.

Notified R3DO (Orth).

Page Last Reviewed/Updated Tuesday, March 10, 2015
Tuesday, March 10, 2015