United States Nuclear Regulatory Commission - Protecting People and the Environment

Event Notification Report for October 12, 2012

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
10/11/2012 - 10/12/2012

** EVENT NUMBERS **


48374 48399 48400 48401

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Agreement State Event Number: 48374
Rep Org: TEXAS DEPARTMENT OF HEALTH
Licensee: BAYER MATERIAL SCIENCE, LLC
Region: 4
City: BAYTOWN State: TX
County:
License #: 01577
Agreement: Y
Docket:
NRC Notified By: ART TUCKER
HQ OPS Officer: HOWIE CROUCH
Notification Date: 10/04/2012
Notification Time: 15:58 [ET]
Event Date: 09/27/2012
Event Time: [CDT]
Last Update Date: 10/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
AGREEMENT STATE
Person (Organization):
DALE POWERS (R4DO)
FSME EVENTS RESOURCE (EMAI)

Event Text

AGREEMENT STATE REPORT - FIXED GAUGE SHUTTER STUCK OPEN

"On September 27, 2012, the Agency was notified by the licensee that the shutter on a Berthold nuclear gauge model number LB300L was found in the stuck open position during a routine inspection. The activity was not provided. The gauge shutter is stuck in the open position, which is the normal operating position. The licensee stated that the gauge does not create an increased exposure risk to any personnel. The manufacturer has been contacted and is scheduled to repair the gauge the first week in October.

"Additional information will be provided as it is received in accordance with SA-300."

Texas Incident # I-8992

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Power Reactor Event Number: 48399
Facility: HARRIS
Region: 2 State: NC
Unit: [1] [ ] [ ]
RX Type: [1] W-3-LP
NRC Notified By: TONY FULTZ
HQ OPS Officer: DONALD NORWOOD
Notification Date: 10/11/2012
Notification Time: 15:00 [ET]
Event Date: 10/11/2012
Event Time: 14:28 [EDT]
Last Update Date: 10/11/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
DEBORAH SEYMOUR (R2DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 98 Power Operation 98 Power Operation

Event Text

TECHNICAL SUPPORT CENTER OUT OF SERVICE DUE TO MAINTENANCE

"At approximately 1428 EDT on October 11, 2012, preplanned maintenance will be performed that will affect the Technical Support Center (TSC) ventilation system. This maintenance will be performed as part of an electric heater control panel inspection (DH-1). This maintenance is expected to be performed and completed within 4 hours. If an emergency condition should occur, the power will be restored, but potentially not within the time required for activation of the TSC. In addition, the Harris Nuclear Plant (HNP) emergency plan has procedural guidance for use of an alternate location in the event the TSC is not habitable.

"This event is reportable per 10CFR50.72(b)(3)(xiii) as described in NUREG-1022, Rev. 2 since this work activity affects an emergency response facility for the duration of the maintenance."

The licensee notified the NRC Resident Inspector.

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Power Reactor Event Number: 48400
Facility: DIABLO CANYON
Region: 4 State: CA
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MICHAEL QUITTER
HQ OPS Officer: STEVE SANDIN
Notification Date: 10/11/2012
Notification Time: 18:44 [ET]
Event Date: 10/11/2012
Event Time: 12:08 [PDT]
Last Update Date: 10/12/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
BOB HAGAR (R4DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 A/R Y 100 Power Operation 0 Hot Standby

Event Text

UNIT 2 EXPERIENCED AN AUTOMATIC REACTOR TRIP ON A 500KV LINE DIFFERENTIAL RELAY ACTUATION

"On October 11, 2012, at 1208 PDT, the Diablo Canyon Power Plant Unit 2 500kV line differential relay actuated, resulting in a unit trip. The unit trip actuated the turbine trip. With the turbine tripped and Unit 2 operating above the P-9 50% power permissive, a reactor trip was initiated from the reactor protection system. All plant equipment responded as designed.

"Unit 2 is stable at normal operating temperature and pressure. All power transferred to the plant startup source without incident. Condenser vacuum was maintained. The cause of the differential relay actuation is under investigation. Based on personnel observation it appears to have been initiated due to a flashover to ground across the phase 'A' main bank transformer capacitive coupled voltage transformer.

"PG&E will issue a press release regarding the Unit 2 trip.

"NRC Resident Inspectors have been informed of this event."

* * * UPDATE FROM DAN STERMER TO DONG PARK AT 2259 EDT ON 10/11/12 * * *

"This update to clarify the status of the auxiliary feedwater system during the above noted transient. Both motor driven pumps and the steam driven pump automatically started as expected.

"In addition, on October 11, 2012, at 12:26 PDT, the Diablo Canyon Power Plant Unit 2 turbine driven auxiliary feedwater pump was secured by plant operators manually closing the steam supply valve to the pump turbine. This action was performed in accordance with plant operating procedures after the operators had verified that the indicated steam generator levels were greater than the procedural requirement of 16%. However, because the steam generator low level bistables associated with the auxiliary feedwater actuation circuits had not yet cleared, the emergency safeguards actuation signal drove the steam supply valve back open, restarting the turbine driven auxiliary feedwater pump.

"Operators increased steam generator levels to clear the bistables and successfully reclosed the steam supply valve.

"The NRC Resident Inspector has been informed of this event."

Notified R4DO (Hagar).

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Power Reactor Event Number: 48401
Facility: PRAIRIE ISLAND
Region: 3 State: MN
Unit: [1] [2] [ ]
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: STEVE INGALLS
HQ OPS Officer: JOHN KNOKE
Notification Date: 10/12/2012
Notification Time: 00:55 [ET]
Event Date: 10/11/2012
Event Time: 21:07 [CDT]
Last Update Date: 10/12/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
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 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

OFFSITE NOTIFICATION DUE TO ONSITE SIRENS ALARMING DURING A DRILL

"On 10/11/12 the Prairie Island Nuclear Generating Plant (PINGP) Security Force was conducting scheduled force on force security drills from 2000 to 2330 CDT. At 2107 CDT the Licensee was notified by the Wisconsin State Radiological Coordinator (SRC) that an intern had contacted the Wisconsin State Patrol Duty Officer to say they had taken cover at the plant and that there were sirens going off in the background. The intern did state that he did not know whether this was a real event or a drill.

"The Wisconsin State Patrol contacted the office of Wisconsin Emergency Management and the SRC. The SRC then contacted the PINGP Control Room and was informed by control room personnel that this was a security force-on-force drill. Xcel Energy Communications has notified other government agencies of this event via an email. No press release is planned at this time. This event is reportable per 10 CFR 50.72(b)(2)(xi)."

The licensee has notified the NRC Resident Inspector.

Page Last Reviewed/Updated Friday, October 12, 2012
Friday, October 12, 2012