PNO-I-99-012, on 990430,Unit 1 Operators Manually Tripped Main Unit Generator,Due to Problems with Generator Hydrogen Seal Oil Sys.Nrc Residents Observed Plant Shutdown & Continue Plant Activities: Difference between revisions

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#REDIRECT [[PNO-I-99-012, on 990302,Intl Paper,Inc Discovered & Informed NRC That Source Housing Containing 80 Mci of Am-241 Could Not Be Located.Commonwealth of PA Has Been Notified of Event.Region I Will Continue to Follow Incident]]
| number = ML20206F257
| issue date = 05/03/1999
| title = PNO-I-99-012:on 990430,Unit 1 Operators Manually Tripped Main Unit Generator,Due to Problems with Generator Hydrogen Seal Oil Sys.Nrc Residents Observed Plant Shutdown & Continue Plant Activities
| author name = Eselgroth P, Kern D
| author affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| addressee name =
| addressee affiliation =
| docket = 05000334
| license number =
| contact person =
| document report number = PNO-I-99-021, PNO-I-99-21, NUDOCS 9905060057
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION & AUDIT & I&E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:                  My  3, 1999~
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-I-99-021 JThic preliminary notification constitutes EARLY notice of events of POSSIBLE esdoty'or public interest significance.'The information is as initially rsesived without verification or evaluation, and is basically all that is known by Region I staff in King of Prussia, Pennsylvania on this date.
Facility                                          Licensee Emeraency Classification
  'Duqussne Light Co.                                  Notification of Unusual Event Bcavar Valley 1-                                   Alert Shippingport, Pennsylvania                          Site Area Emergency Dockots: 50-334                                    General Emergency X Not Applicable 1
Subj ct:    BEAVER VALLEY UNIT 1 SHUTDOWN GREATER THAN 72 HOURS On. April 30 at 8:52 p.m. with Beaver Valley Unit 1 at 10 percent power, operators manually tripped the main unit generator due to problems with the generator hydrogen seal oil system. The plant had recently ccmpleted
  -cn 18 day surveillance testing outage and was preparing to synchronize to the transmission grid when the generator hydrogen cooling panel trouble clarm activated. Field operators were dispatched and noted that the generator seal oil pressure was low. Because the hydrogen pressure inside the generator had decreased 6 psig from a pre-event value of 69 psig,
  -atation personnel evacuated the turbine building. Explosive gas surveys indicated no hydrogen accumulation present. Normal access to the turbine              l bu:,1 ding was . restored at 9 :16 p.m.
on May 1, another attempt to synchronize the main unit generator was attempted. Operators experienced continuing problems with maintaining scal oil system pressure and tripped the main unit generator at 6:08 a.u., prior to synchronization with the transmission grid. The Nuclear-Sh:.f t Supervisor directed operators to perform a normal reactor shutdown from 15 percent reactor power and achieved Mode 3 (hot standby) at 11:41 c.m. The unit remains in Mode 3 with the generator degassed of hydrogen.           -
! .Praliminary analysis indicates that impurities in the seal oil system clogged the in-line filters and resulted in a reduction in oil pressure
!  to the generator hydrogen seals. Investigation into the exact nature of the' impurities continues, but the licensee believes that the impurities
,  cre internal corrosion products. The licensee plans to meintain the plant              l in Mode 3 while they perform a generator hydrogen seal oil system flush              j End verify the condition of the main turbine lube oil system. Plant i
rantart is-scheduled for late this' week.                                            3
  -The NRC residents observed the plant shutdown and continue to monitor plant, activities, f
  .The contents of this PN have been communicated to-the Pennsylvania, Ohio end-West Virginia state governments.
  ~
 
==Contact:==
ESELGROTH, PETE          KERN, DAVID (610)337-5234            (724)643-2000 oL -
                                    ~
9905060057 990503 PDR  I&E PNO-I-99-021    PDR                                                    i Osuopg}}
 
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