View source for PNO-IV-87-051, on 870927,plant Tripped from 85% Power.Caused by High Negative Flux Rate After Control Rods Fell Into Core.Cause of Dropped Rods Not Determined.Planned Shutdown for Refueling Outage Scheduled for 871001

{{Adams
| number = ML20235K506
| issue date = 09/28/1987
| title = PNO-IV-87-051:on 870927,plant Tripped from 85% Power.Caused by High Negative Flux Rate After Control Rods Fell Into Core.Cause of Dropped Rods Not Determined.Planned Shutdown for Refueling Outage Scheduled for 871001
| author name = Hunter D
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000482
| license number = 
| contact person = 
| document report number = PNO-IV-87-051, PNO-IV-87-51, NUDOCS 8710050120
| 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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September 28, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PN0-IV-87-51 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: Wolf Creek Nuclear Operating                 Licensee Emergency Classification:
Corporation                                   Notification of Unusual Event Wolf Creek Generating Station                   Alert Burlington, Kansas                              Site Area Emergency                a DN:   50-482                                    General Emergency X Not Applicable                         ~

==SUBJECT:==
UNPLANNED SHUTDOWN GREATER THAN 48 HOURS On September 27, 1987, at 2:32 a.m. (CDT) Wolf Creek tripped from 85 percent                            ',
power. The cause of the trip was high negative flux rate after control rods fell into the core when the reactor operator moved the controlling rod group one step in the out direction. All ESF equipmerct actuated properly. The cause of the dropped rods has not yet been determined.                                                      ,
The planned shutdown for a refueling outage was scheduled for Thursday, October 1,1987; therefore, the licensee entered the refueling outage early.
The outage is scheduled to last 49 days and will include: safety and relief valve testing, NDE to look for pipe wall thinning, M0 VATS testing, and change out of 52 fuel assemblies.
Neither the licensee nor the NRC plans to issue a press release.                                      i The state of Kansas will be informed.
Region IV received notification of this occurrence by telecon from the SRI at 7:30 a.m.       Region IV has informed NRR/PA.
This information has been confirmed with a licensee representative.
CONTACT:       D. R. Hunter (FTS 728-8103)
DISTRIBUTION:
MAIL:                                   '
H. St.                    MNBB        E/W          Willste          XURIDMB (Original)
Chairman Zech             ED0         OIA          NMSS             DOT:(Trans only)
Conn. Bernthal            PA          AEOD         RES Comm. Roberts             OGC         VIB                            FAX:
Conn. Rogers              MPA         OE                             WO Conn. Carr                            01                             NSAC ACRS                                                                 GPA          (Air SECY Rights)
CA                       Phillips                                   RRI POR                     NRR                                        NRC OC DCS                                        LICENSEE.:
(Reactor Licensee)
Regional Offices              goog2O870928                                     [
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                                                                                  ~ W-87-051         PDR Transmitted 1:15p 9/28/87 - jc f
9/9 /87                  9p /87                                                            O i
________}}

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