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Event Notification Report for November 17, 2009

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
11/16/2009 - 11/17/2009

** EVENT NUMBERS **


45499 45500

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Power Reactor Event Number: 45499
Facility: HARRIS
Region: 2 State: NC
Unit: [1] [ ] [ ]
RX Type: [1] W-3-LP
NRC Notified By: LEWIS ROGERS
HQ OPS Officer: DONG HWA PARK
Notification Date: 11/16/2009
Notification Time: 02:24 [ET]
Event Date: 11/15/2009
Event Time: 22:42 [EST]
Last Update Date: 11/16/2009
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
MARK LESSER (R2DO)

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

Event Text

MANUAL REACTOR TRIP DUE TO MAIN GENERATOR OIL LEAK

"At 2242 [EST] on 11/15/09, the reactor was manually scrammed from 100% power due to a large oil leak on the main generator seal oil system. Condenser vacuum was broken immediately following the reactor trip, and the main turbine stopped rotating at 2324 [EST]. Following the reactor trip, the 'B' steam generator Main Steam Isolation Valve (MSIV) failed to fully close on demand, but was closed due to field actions at 2303 [EST]. The reactor remained stable at NOP/NOT following the reactor trip. Offsite power remained available throughout the event.

"This condition is being reported as actuation of the reactor protection system in accordance with 10CFR 50.72(b)(2)(iv)(B)."

All control rods fully inserted and decay heat is being removed through the S/G relief valves to the atmospheric dumps. No known primary to secondary leakage exists. The plant remains stable in Mode 3.

The licensee notified the NRC Resident Inspector.

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General Information or Other Event Number: 45500
Rep Org: WARTSILA FRANCE S.A.S
Licensee: WARTSILA FRANCE S.A.S
Region:
City:  State:
County:
License #:
Agreement: N
Docket:
NRC Notified By: DANIEL DIETRICH
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 11/16/2009
Notification Time: 14:27 [ET]
Event Date: 11/16/2009
Event Time: [EST]
Last Update Date: 11/16/2009
Emergency Class: NON EMERGENCY
10 CFR Section:
21.21 - UNSPECIFIED PARAGRAPH
Person (Organization):
RAYMOND MCKINLEY (R1DO)
ERIC DUNCAN (R3DO)
PART 21 GROUP ()

Event Text

PART 21 NOTIFICATION - POTENTIAL FAILURE IN EMERGENCY DIESEL GENERATOR BEARINGS

The following report was received via facsimile:

"PART 21 involving Wartsila type SACM UD45 Emergency Diesel Generating [EDG] set big end bearings installed in the US nuclear power stations of Constellation Energy at Calvert Cliffs and Xcel Energy at Prairie Island.

"COMPONENT: Big end bearing DLT141885 all batches & DLT123351 batches A2, F2, J2 on Wartsila type SACM UD45 [EDG] sets.

"DISCUSSION: Three of four incidents which have been reported to Wartsila France are related to UD45 diesel engines operating at 1500 rpm in nuclear installations. Big end bearing damage can result in non-availability of the diesel engine. Wartsila France has been working on the root cause analysis after the first reported failure and has given an overall recommendation in October 2009 regarding the risks of using the above mentioned big end bearings on diesel engines running at 1500 rpm (50 Hz applications). An additional technical evaluation has been issued in November 2009 after testing a new big end bearing. The evaluation has determined that this is potentially a reportable defect as defined by 10CFR21.

"AFFECTED USERS: UD45 engines

"CORRECTIVE ACTION: Being unable to predict the occurrence of such a random event, Wartsila France has advised its customers to: identify the [EDG] sets equipped with big end bearings above referenced in COMPONENT, stop the utilization of big end bearings above referenced in COMPONENT, replace all above referenced in COMPONENT big end bearings by a new reference PAAG129161 which has been qualified after extensive running tests on a 1500 rpm engine. Wartsila has not recorded such a situation on other UD45 diesel engines running at a lower speed of 1200 rpm (60 Hz applications) which are installed as Emergency Generating sets in nuclear power plants. Nevertheless Wartsila France recommendation if components have also been identified in 1200 rpm units installed in US nuclear power plants or if such components are held in stock, is to replace them with the new reference big end bearing PAAG129161."

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