Alert

Due to a lapse in appropriations, the NRC has ceased normal operations. However, excepted and exempted activities necessary to maintain critical health and safety functions—as well as essential progress on designated critical activities, including those specified in Executive Order 14300—will continue, consistent with the OMB-Approved NRC Lapse Plan.

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 **

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

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.

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).

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 Thursday, March 25, 2021