View source for PNO-III-88-015, on 880302,reactor Tripped Automatically from 93% Power.Caused by Fault in Electrical Distribution Bus Which Provides Power to Reactor Coolant Pumps & Main Feedwater Pumps.Similar Event Occurred on 870710

{{Adams
| number = ML20147G655
| issue date = 03/03/1988
| title = PNO-III-88-015:on 880302,reactor Tripped Automatically from 93% Power.Caused by Fault in Electrical Distribution Bus Which Provides Power to Reactor Coolant Pumps & Main Feedwater Pumps.Similar Event Occurred on 870710
| author name = Defayette R, Knop R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| addressee name = 
| addressee affiliation = 
| docket = 05000305
| license number = 
| contact person = 
| document report number = PNO-III-88-015, NUDOCS 8803080289
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:PRELIMINA Y NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-88-15 Date March 3, 1988 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without
  ' verification or evaluation, and is basically all that is known by the Region III staff;on this date.
Facility: Wisconsin Public Service Corp.               Licensee Emergency Classification:
Kewaunee-                                        Notification of an Unusual Event Kewaunee, WI 54216                               Alert Site Area Emergency General Emergenc.)
Docket No. 50-305                         xx     Not Applicable Subj:ct: REACTOR TRIP CAUSED 8Y FAULT IN ELECTRICAL SYSTEM At 1:48'p.m. on March 2, 1988, the reactor tripped automatically from 93 percent power as a result of a fault in an electiical distribution bus which provides power to the reactor coolant pumps and main feedwater pump,. All safety systerns functioned as designed during the shutdown. The_ turbine room filled with smoke, but there was no fire. The plant will remain shut down for a 36-day refueling outage which had originally been scheduled to begin March 4. The reactor trip ended a 235-day period of continuous operation.
A similar fault on an electrical bus caused a reactor trip on July 10, 1987.              Other electrical distribution bus problems occurred at Kewaunee in January 1980, November 1975, and April 1975.
The licensee is investigating the cause of the bus failure. Region III (Chicago) and the NRC Resident Inspector will monitor the licensee's evaluation and corrective actions.
The State of Wisconsin will be notified.
Region III was notified of this event.about 3:35 p.m., March 2, 1988, by the Headquarters Operation C ter. This           ormation is cu en         of 1      .m., March 3, 1988.
: 4.                                  .
                                                             /}
CONTACT:    R. ayet                        .    . Knop //
FTS 388-5767                  "' FTS 388-5547                                            x DISTRIBUTION:
H. St.                  NMBB           Phillips           E/W          WFN 1 Chairman Zech          KEDU            NRR                DIX          NMSS Com. Roberts            ARM                               01 Comm. Bernthal          ED0            AirRights                       Mail To:
Com. Carr               PA             SLITP /;.30                     DCS (Original)
Comm. Rogers            OGC                                            DOT (Trans. Only)
SECY OGC-H                   FAX T0:        Nicholson Lane                  Regions CA                      INPO /t        RES                             Region I GPA NSAC3,f[                                       Region II
<  ACRS                    Licensee J'O                                   Region IV POR                     Resident Inspector                             Region V HQS. Operations Officer / 'D, Region III Rev. November 1987 8803080289 880303
         % gif-88-015 DCD                                                                           0(
TEJV}}

{{PNO-Nav|region=III}}