View source for PNO-I-98-051, on 981112,licensee Shutdown Seabrook Station, After Visual Insp Indicated Damage to Main Generator a Phase Output bus.One-week Outage Planned to Troubleshoot & Repair Bus Ductwork.Licensee Did Not Issue Press Release

{{Adams
| number = ML20155K559
| issue date = 11/13/1998
| title = PNO-I-98-051:on 981112,licensee Shutdown Seabrook Station, After Visual Insp Indicated Damage to Main Generator a Phase Output bus.One-week Outage Planned to Troubleshoot & Repair Bus Ductwork.Licensee Did Not Issue Press Release
| author name = Cowgill C, Lorson R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| addressee name = 
| addressee affiliation = 
| docket = 05000443
| license number = 
| contact person = 
| document report number = PNO-I-98-051, PNO-I-98-51, NUDOCS 9811160019
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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November 13, 1998
    ~ PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-I-98-051 Thic' preliminary notification constitutes EARLY notice of events of POSSIBLE cafety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by Region I staff in King of Prussia, Pennsylvania on this date.
Engility                                                 Licensee Emeroency Classification New Hampshire Yankee                                       Notification of Unusual Event Saabrook 1                                                 Alert 1
Manchester,New Hampshire                                   Site Area Emergency Dockets: 50-443                                            General Emergency                1 X Not Applicable                    l l

==Subject:==
REACTOR SHUTDOWN IN EXCESS OF 72 HOURS The licensee shut down Seabrook Station on November 12, 1998, after a visual inspection indicated damage to the main generator "A" phase output bus. The bus degradation was detected during a routine predictive maintenance activity, which identified elevated temperatures external to                   i the bus'ductwork. The damage occurred on the ductwork and the flexible connections to the input of the generator step-up (GsU) transformer. This transformer and bus also serve as one of the offsite power sources. The
    . operators are in the process of placing the unit in the cold shutdown condition per the facility Technical Specification. The second offsite power supply and both emergency diesel generators are available. The                        t licensee formed an event team to determine the probable cause for the
    . damage and to supervise the bus repairs. A one-week outage is planned                  to troubleshoot and repair the bus ductwork.                                                   -
The resident inspector observed portions of the plant shutdown and                           {
initial visual inspections of the bus ductwork.                                              i i
The licensee did not issue a press release but did inform several members of the media.
Th~e state of New Hampshire and the Commonwealth of Massachusetts have been notified.

==Contact:==
R. Lorson                     C. Cowgill (603)474-3589                (610)337-5233 i
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