View source for PNO-IV-86-007, on 860301,reactor Tripped from 38% Power. Caused by Failure of Nonvital Electrical Transformer. Reactor Restarted.Resident Inspectors Monitoring Licensee Activities

{{Adams
| number = ML20154G920
| issue date = 03/03/1986
| title = PNO-IV-86-007:on 860301,reactor Tripped from 38% Power. Caused by Failure of Nonvital Electrical Transformer. Reactor Restarted.Resident Inspectors Monitoring Licensee Activities
| author name = Jaudon J
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000458
| license number = 
| contact person = 
| document report number = PNO-IV-86-007, PNO-IV-86-7, NUDOCS 8603100143
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:Harch 3, 1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-86-07 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 IV staff on this date.
FACILITY:                                 Licensee Emergency Classification:
Gulf States Utilities                       X   Notification of Unusual Event River Bend Station                              Alert St. Francisville, Louisiana                     Site Area Emergency Docket No.: 50-458                              General Emergency Not Applicable

==SUBJECT:==
REACTOR TRIP AND HOMENTARY SAFETY INJECTION On March 1, 1986, the River Bend Station tripped from 38% power at 6:40 a.m.
(CST). The sequence of events leading to the trip was initiated by the failure of a nonvital electrical transformer. This resulted in a voltage transient which caused the one feed pump which was operating to trip. The operators started the Reactor Core Isolation Cooling (RCIC) pump, but before feed from the RCIC Dump was effectively established, the reactor tripped on low water level. The High Pressure Core Spray (HPCS) system also started, but it was secured in about 1 minute since reactor vessel water level was reestablished and was being controlled by RCIC. The licensee reported the trip and subsequently determined that an unusual event had occurred because of the HPCS injection. The reactor was restarted late on March 1. The senior resident inspector was contacted by the licensee at the time of the trip. The resident inspectors are monitoring licensee activities.
The state of Louisiana has been informed.
There have been no press releases issued.
CONTACT:   J. P. Jaudon (FTS 728-8140)
DISTRIBUTION:
ItAIL:
H. St.                HNBB        E/W           Willste      XURIDMB (Original)
Chairman Palladino EDO             IE           NMSS         D0T:(Trans only)
Com. Zecn             PA          OIA           RES Com. Bernthal         ELD         AE0D                         FAX:
Comm. Roberts         MPA         VIB                          TTWO Com. Asselstine                                                NSAC ACRS                  Phillips                                 RRI SECY                  NRR                                      SP           (Air CA                    DCS                                                   Rights)
PDR                                                            LICENSEE:
Regional Offices                                    (ReactorLicensee) 4W RIV:DRSP              RA [ld EHJohnson/lk          RDMJrtin                                                       k 03/03/86              03/03/86~                                                        gk 0603100143 060303                                                             /
N[o-IN-56-007       PDR                                                      \
L}}

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