View source for PNO-III-92-045, on 920908,unit Shut Down Due to High Generator Vibrations.Cause Undetermined.Licensee Will Remove & Inspect Generator Rotor

{{Adams
| number = ML20127D957
| issue date = 09/09/1992
| title = PNO-III-92-045:on 920908,unit Shut Down Due to High Generator Vibrations.Cause Undetermined.Licensee Will Remove & Inspect Generator Rotor
| author name = Jorgensen B
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| addressee name = 
| addressee affiliation = 
| docket = 05000316
| license number = 
| contact person = 
| document report number = PNO-III-92-045, PNO-III-92-45, NUDOCS 9209150233
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:-_ _ _- - - _ _ _ - -                                                                             -
Date: September 9, 1992          bc6 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PN39245 This preliminary notification constitutes EARLY notice of events                                                               '
of POSSIBLE safety or public interest significance                                                             The information is as initially received without verif' .ation or evaluation, and is basically all that is known by the Region III staff on this date.
Facility: Indiana Michigan                                                             Licenseem Emeroency Classificatio_n Power Company                                                General Emergency Columbus, Ohio                                                                  Site Area Emergency                 .
Alert D. C. Cook, Unit 2                                                              Unusual Event                h/g Docket No. 50-316                                                           X _N/A Subjects    UNIT SilOTDOWN DUE TO IIIGli GENERATOR VIBRATIONS On September 8, 1992, at 4:13 p.m., the licensee commenced a power reduction of Unit 2 from 87 percent power after vibration levels on the #6 generator bearing increased from approximately 6 to 11 mils. The high vibrational levels persisted during the power reduction; therefore, the unit was removed from the grid and the turbine was manually tripped at about 9:00 p.m. from 8 percent
                      -power. The unit had previously been paralleled to the grid on September 2, 1992, following an extended period troubleshooting the high vibration on the main turbine and generator bearings.
The reactor is currently being held at 8 percent power and the licensoc is evaluating the root cause of the vibrational problems.                                                                     ,
The licensee's current focus is on generator eccentricity and shaft runout evaluations. Although the root cause remains to be determined, the licenseo has decided to remove and inspect the generator rotor. An outage of approximately three to four weeks is expected.
The State of Michigan will be notified. The information in this Preliminary Notification has been reviewed with licensee management.
Region III was n9tified of this event at about 4:00 p.m.,
September _8,-199S, This information is current as of 11:30 a.m.
(CDT), Se                                   ber 9, 1992.
CONTACT:/,B.Jorgensen                                                            fjg915{g33920909 708/388-5689                                                         PNO-Ill           PDR                    Jigg p DISTRIBUTION:
HEADOUARTERS OFFICES                                                                   REGIONS _            MAIL TO:          !O NMSS              Region I              DCS (Orig)
                       'Comm. Rogers                                                             OSP               Region II             DOT (Trans Comm. Curtiss                                                            OPA                Region IV                 Only)
Comm. Remick Comm. de Planque OCA 14002'0 "Si "V EDO Gen. Counsel                                                             OCAA'                      FAX TO:
NRR                                                                 Research       The Chairman /EW             INPO /2 62 AEOD                                                                IRM            NSAC /.2/ .5 7   LIC    />d5 NRC OPS CTR /JU59 Enforcement                                                         ACRS           PDR (8/634-3343) /.R ? 5V OIG /JF 4#
                       -OIG'                                                                              ilQ Public Af f airs /2 J47 LSSA                                                                              A. Byrdsong, NRR /2.'4' Region V
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