United States Nuclear Regulatory Commission - Protecting People and the Environment

Event Notification Report for January 5, 2012

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
01/04/2012 - 01/05/2012

** EVENT NUMBERS **


46776 47564 47566 47569

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Part 21 Event Number: 46776
Rep Org: CURTISS WRIGHT FLOW CONTROL CO.
Licensee: CURTISS WRIGHT FLOW CONTROL CO.
Region: 1
City: HUNTSVILLE State: AL
County:
License #:
Agreement: Y
Docket:
NRC Notified By: TONY GILL
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 04/22/2011
Notification Time: 12:46 [ET]
Event Date: 04/22/2011
Event Time: [CDT]
Last Update Date: 01/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
Person (Organization):
PART 21 GROUP ()
JONATHAN BARTLEY (R2DO)

Event Text

POTENTIAL DEFECT IN SUBMERSIBLE VALVE POSITION SENSORS

"This letter is issued to provide notification of a potential defect in QualTech NP Top Potted Generation 3 Quick Disconnect Connector Pin Side assemblies installed on Topworx C7 and SV7 switches. All assemblies supplied prior to April 20, 2011 are potentially affected. These assemblies were supplied to Topworx [as] submergence qualified in accordance with our Test Report EGS-TR-23009-14. It was discovered during supplemental qualification testing that previously supplied assemblies may not properly seal against moisture intrusion if utilized in a submergence application.

"The recommended corrective action for existing assemblies is to pressure test and, if required, repair them. Corrective actions already implemented will be effective in preventing recurrence of this condition. Additionally, all future assemblies will be required to pass pressure testing prior to acceptance.

"It has been confirmed that all assemblies previously supplied are for use in Chinese Nuclear Power Plants and therefore, no US plants are affected." Most of the assemblies are still in this country and the remainder are in Switzerland awaiting shipment. All assemblies will be recalled and pressure tested.


* * * UPDATE RECEIVED VIA FAX FROM TONY GILL TO JOE O'HARA AT 1545 ON 8/12/11 * * *

"The purpose of this letter is to provide additional information concerning the status of all affected assemblies. As stated in the previous notifications all serial numbers affected by this defect have been identified and to date only 30 production units remain to be returned for testing/repair. We are still experiencing 100% success when repair is needed.

"It was previously reported that 'all affected assemblies were for use in Chinese Nuclear Power Plants and therefore no US Plants are affected'. This is no longer a correct statement. Our customer, Topworx, notified us on August 9 that one of their customers, Flowserve, had supplied valve packages containing 16 of these assemblies to Pilgrim Station in Plymouth, MA. It has been reported to us that these assemblies were never installed and are in the process of being returned for testing/repair.

"These 16 assemblies are included in the 30 production units remaining to be tested/repaired. It has been identified that 4 of the remaining assemblies are still in China and the other 10 were supplied to Flowserve.

"Additional information concerning these assemblies will be provided as it becomes available. A final letter will be issued once corrective actions for these 30 assemblies are complete."

Notified R1DO(Powell), Part 21 GRP via e-mail

* * * UPDATE RECEIVED VIA FAX FROM TONY GILL TO CHARLES TEAL AT 1623 EST ON 1/4/12 * * *

"On April 22, 2011 QualTech NP, Huntsville issued an initial notification letter to the Nuclear Regulatory Commission and our Customer Topworx concerning a potential defect in QualTech NP Top Potted Generation 3 Quick Disconnect Connector Pin Side assemblies installed on Topworx C7 and SV7 Switches. A total of three notification/status letters associated with this subject have been previously issued.

"As of this date all affected production units have been returned and tested/repaired. We have experienced 100% success when repair was needed.

"This letter provides the final status and closeout of the above referenced 10CFR21 notification."

Notified R1DO (Holoday) and Part 21 group via email.

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!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 47564
Facility: DIABLO CANYON
Region: 4 State: CA
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MICHAEL KENNEDY
HQ OPS Officer: BILL HUFFMAN
Notification Date: 12/31/2011
Notification Time: 11:53 [ET]
Event Date: 12/31/2011
Event Time: 02:00 [PST]
Last Update Date: 01/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
GREG WERNER (R4DO)

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

FIRE BARRIER RATING OF VITAL SWTICHGEAR WALLS MAY NOT MEET STANDARDS

"On December 31, 2011 at 0200 PST, a plant employee indentified the fire barrier material in each unit was potentially not qualified as a 3 hour rated fire barrier as specified by the Diablo Canyon power plant fire protection program. The fire barrier material in question is installed between the block wall portion of the barrier and the door frames in the walls separating three of the 480 Volt switchgear buses and separating the three vital instrument AC inverters. The condition was discovered by a plant employee who questioned the configuration while performing a routine tour of that area. Operators confirmed existing fire watches were in place and established additional fire watches as compensatory measures as required by the Diablo Canyon fire protection program.

"A review of the Appendix R fire protection analysis is in progress to confirm the rating of the installed configuration.

"The licensee has notified the NRC Resident Inspector."


* * * RETRACTION FROM CRAIG HARVEY TO DONALD NORWOOD At 1955 EST on 1/4/2012 * * *

"This is an update to EN 47564 reported on 12/31/11 where it was reported that plant personnel had identified rated fire barriers were not qualified as a three hour rated barrier as required by the DCPP Fire Protection Program.

"On 1/3/12 plant personnel provided barrier design drawings to the manufacturer of the DCPP fireproofing material. The manufacturer reviewed the design detail and confirmed that the barrier design depicted on the drawing is qualified as a 3 hour barrier. Therefore no unanalyzed condition that significantly degraded plant safety existed. This event is being retracted.

"The licensee notified the NRC Resident Inspector."

Notified R4DO (Vasquez).

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Power Reactor Event Number: 47566
Facility: COOK
Region: 3 State: MI
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: MARK ESSIG
HQ OPS Officer: PETE SNYDER
Notification Date: 01/03/2012
Notification Time: 03:33 [ET]
Event Date: 01/03/2012
Event Time: 04:00 [EST]
Last Update Date: 01/04/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
MARK RING (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

UNAVAILABILITY OF TECHNICAL SUPPORT CENTER VENTILATION DUE TO SCHEDULED MAINTENANCE

"At 0400 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems will be removed from service for scheduled maintenance.

"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary.

"TSC ventilation system maintenance is scheduled to be completed by 1500 EST on Tuesday, January 3, 2012.

"The licensee has notified the NRC Resident Inspector."


* * * UPDATE FROM BEN HUFFMAN TO DONALD NORWOOD AT 1645 EST ON 1/3/12 * * *

"The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1644 EST on 1/3/12."

The licensee notified the NRC Resident Inspector. Notified R3DO (Valos).

* * * UPDATE AT 0546 EST ON 1/4/12 FROM ESSIG TO HUFFMAN * * *

"UNAVAILABILITY OF TSC VENTILATION SYSTEM DUE TO DAMPER FAILURE

"This is an update to EN #47566.

"At 2300 EST on Tuesday, January 3, 2012, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration system volume damper 12-HV-TSC-SD-6, TSC Ventilation Normal Flow to and from Air Conditioner HV-TSC-AC-1 Volume Damper, did not reposition during surveillance 12-OHP-5030-028-007 TSC Ventilation Filtration System Functional Test. When the damper position was checked, damper remained open with system in Emergency mode. Per 12-OHP-5030-028-007, if any damper fails to reposition, the ventilation unit is considered non-functional.

"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary. TSC ventilation system maintenance had previously been performed to clean, inspect, and lubricate linkages associated with this damper on 1-3-2012. That work was completed at approximately 1700 EST on 1-3-2012.

"Following discovery, maintenance was contacted and discovered the linkage was loose for 12-HV-TSC-SD-6. Maintenance adjusted the linkage and damper was retested satisfactory at 0311 EST on 1-4-2012. TSC functionality has been restored.

"The licensee has notified the NRC Resident Inspector.

"This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility."

R3DO (Valos) notified.

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Power Reactor Event Number: 47569
Facility: PRAIRIE ISLAND
Region: 3 State: MN
Unit: [1] [2] [ ]
RX Type: [1] W-2-LP,[2] W-2-LP
NRC Notified By: MARK LOOSBROCK
HQ OPS Officer: VINCE KLCO
Notification Date: 01/05/2012
Notification Time: 05:18 [ET]
Event Date: 01/05/2012
Event Time: 03:53 [CST]
Last Update Date: 01/05/2012
Emergency Class: ALERT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED
Person (Organization):
NICK VALOS (R3DO)
CYNTHIA PETERSON (RA)
ERIC LEEDS (NRR)
SCOTT MORRIS (IRD)
STRANGFELD (DHS)
BLANKENSHIP (FEMA)
JACKSON (DOE)
KRAUS (USDA)
JENKINS (HHS)

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

SODIUM HYPOCHLORITE LEAK RESULTED IN AIRBORNE CONCENTRATIONS DANGEROUS TO LIFE AND HEALTH

"A section of piping between sodium hypochlorite tanks[tanks 121 and 122] broke and resulted in a unisolable leak in one of the tanks. The spill was contained within the berm of the chlorine house.

"The spill resulted in airborne concentrations exceeding Immediately Dangerous to Life and Health (IDLH) conditions in the chlorine house, which is contiguous to the plant screen house.

"Alert declared based upon HA3.1 - Report or detection of toxic gases within or contiguous to Table H-1 areas in concentrations that may result in an atmosphere Immediately Dangerous to Life and Health (IDLH)."

The licensee will remain in the Alert until IDLH conditions have been terminated. An offsite HAZMAT team has been notified and is expected to be on-site today at 0630 CST to clean up the spill.

The licensee will notify the Resident Inspectors.

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