PNO-III-85-063A, investigation Concluded That Vibration in South Reactor Feeder Pump Turbine,Plus Inadequate Securing of Outboard Bearing Cap Caused Turbine Failure.Study of Problem Continuing: Difference between revisions

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{{Adams
#REDIRECT [[PNO-III-85-063, on 850723,reactor Shut Down to Repair Thrust Bearing Housing on Feedwater Pump,Damaged During 850722 Demonstration Testing.Further Exam Underway]]
| number = ML20133P583
| issue date = 08/05/1985
| title = PNO-III-85-063A:investigation Concluded That Vibration in South Reactor Feeder Pump Turbine,Plus Inadequate Securing of Outboard Bearing Cap Caused Turbine Failure.Study of Problem Continuing
| author name = Chrissotimos N, Wright G
| author affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
| addressee name =
| addressee affiliation =
| docket = 05000341
| license number =
| contact person =
| document report number = PNO-III-85-063A, PNO-III-85-63A, NUDOCS 8508140377
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION & AUDIT & I&E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-85-63A        Date August 5, 1985 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or DMb public interest significance. The information is as initially received without veri-          [op fication or evaluation, and is basically all that is known by the staff on this date.
Facility: Detroit Edison Company                          Licensee Emergency Classification:
Fermi 2 Nuclear Plant                              Notification of an Unusual Event Newport, MI 48166                                  Alert Site Area Emergency Docket No: 50-341                                  General Emergency XX  Not Applicable
 
==Subject:==
SHUTDOWN TO REPAIR FEEDWATER PUMP (UPDATE)
The licensee's investigation has concluded that vibration in the South Reactor Feed Pu'ip (SRFP) turbine, coupled with the recent inadequate securing of the outboard bearing ct.p. was the cause of the turbine failure.
Licensee documentation shows the SRFP turbine has had vibration problems since 1983 and the condition has steadily deteriorated. During pre-operational testing, the turbine vibrated 7 to 8 thousandths of an inch between 1600 and 1700 rpm. Normal vibration is less than one thousandth of an inch. The vibration decreased however, during normal running speeds of 5000 to 6000 rpm. The vendor, Transamerica DeLaval, Inc.,
told the licensee that the SRFP turbine rotor is bowed approximately 20 thousandths of an inch.
The licensee and the vendor continue to study the problem.
The North Reactor Feed Pump (NRFP) has no history of vibration problems. The licensee has inspected the bearings and instrumented the turbine and believes the NRFP can be operated safely.
The Senior Resident Inspector continues to monitor the licensee's activities.
The State of Michigan will be notified.
The Senior Resident Inspector was notified of this updated information at 6:15 a.m., (CDT), August 5, 1985. This information is current as of 11 a.m.(CDT),
August 5, 1985.
CONTACT:      . Wright          I    rs(Mimos FTS 388-5695      FTS 388-5716 DISTRIBUTI)N:
H. St.M                    MNBB 317        Phillips3/=10      E/W .3.Dh        Willste d'A3 Chairman Palladino        ED0            NRR                IE              NMSS Conn. Roberts              PA                                OIA              RES Conn. Asselstine            MPA                                AEOD Comm. Bernthal              ELD            AirRights1/M                        MAIL:
Comm. Zech                                SP                INP03.,29        ADM:DMB            ,
SECY                                                          NSAC M '        D0T: Trans Only    !
A PDR        Regions I .I.']), pplicable Resident Sited /OII3/QO, IVJi@I, V3;f L                    '
8508140377 850805                                            Rev. 07/06/84
                              -I    85-063 PDR                                                      j}}
 
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