View source for PNO-V-85-077, on 851113,blown Fuse in Water Level Control Sys Resulted in Reactor Feedpumps Overfeeding & Reactor Trip.Caused by Faulty Inverter.Facility Shut Down to Allow Installation of Instrumentation to Monitor Vibrations

{{Adams
| number = ML20136B074
| issue date = 11/13/1985
| title = PNO-V-85-077:on 851113,blown Fuse in Water Level Control Sys Resulted in Reactor Feedpumps Overfeeding & Reactor Trip.Caused by Faulty Inverter.Facility Shut Down to Allow Installation of Instrumentation to Monitor Vibrations
| author name = Qualls P, Toth A
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000397
| license number = 
| contact person = 
| document report number = PNO-V-85-077, PNO-V-85-77, NUDOCS 8511200124
| 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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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-85-77                       Date: 11/13/85 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public intsrest significance. The information presented is as initially received without verification
          'or Gvaluation and is basically all that is known by Region V staff on this date.
FACILITY: Washington Public Power Supply System                              Licensee Emergency Classification WHP-2                                                               Notification of Unusual Event Docket No. 50-397                                                   Alert Site Area Emergency General Emergency XX Not Applicable.

==SUBJECT:==
TRIP OF WNP-2
         ' On November 13, 1985 at 6:02 am (PST), while operating at 50% power, a blown fuse in the wztsr level control system resulted in Reactor Feedpumps overfeeding the reactor vessel.
Thia condition resulted in high reactor vessel water level which properly tripped the
          ' turbine, thus leading, as expected, to a reactor trip. The licensee has experienced over "th2 past months- vibration problems with fast speed operation of the "B" recirculation pump This has necessitated plant operation below 73% power. The licensee has opted as a result of this. trip to stay shutdown for several days to allow the installation of additional instrumentation to monitor. vibration of the "B" recirculation pump. This vibration problem appears to have had no input into the plant trip. The licensee expects to resume plcut operation in 3 or 4 days. After the trip, the licensee's investigation revealed that a fculty inverter may have caused the blown fuse.                                                  -
        - CONTACT:      P. Qualls                                    A. Toth FTS 463-3759                                 (509)-377-2627 DISTRIBUTION:
        . H St.T                      MNBB          Phillips          E/W       Willste    Air Rights       Mail:
Ch irman Pa111dino- EDO                     NRR             IE         NMSS                      ADM:DMB Comm.-Zech                  PA                          ,
OIA        RES                       DOT:Trans Only
        . C:mm. Bernthal               MPA                             AEOD Comm. Roberts               ELD Comm. Asselstine                            Regions:
SECY                                         INPO /.*S1 NSAC.7 :, :2_
ACRS                                         Licensee: 2.'o9 CA                    ''                      (Reactor Licensees)            REGION V: FORM 211 PDR                                         Resident Inspector _                  (Revised 3/14/83)
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851120 124 851113
                                    .      PDR        IsrE            PDR                                        I !
PNO-V-85-077      -    -
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