View source for PNO-I-87-070, on 870730,reactor Trip Occurred Due to High Pressure Signal Caused by Closure of Msiv.Caused by Air Loss Due to Leakage.Shutdown Initiated to Repair Equipment

{{Adams
| number = ML20236G390
| issue date = 07/30/1987
| title = PNO-I-87-070:on 870730,reactor Trip Occurred Due to High Pressure Signal Caused by Closure of Msiv.Caused by Air Loss Due to Leakage.Shutdown Initiated to Repair Equipment
| author name = Bateman, Blough
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| addressee name = 
| addressee affiliation = 
| docket = 05000219
| license number = 
| contact person = 
| document report number = PNO-I-87-070, PNO-I-87-70, NUDOCS 8708040238
| 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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DCS No: 50219870730 Date: July 30, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-87-70 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 I staff on this date.
Facility:                                           Licensee Emergency Classification:
GPU Nuclear Corporation                                                    Notification of Unusual Event Oyster Creek Nuclear Generating Station                                    Alert Docket No. 50-219                                    ,_ _ Site Area Emergency Forked River, New Jersey                                                  General Emergency X                           Not Applicable

==Subject:==
REACTOR TRIP AND SHUTDOWN FOR GREATER THAN 48 HOURS A reactor trip occurred at 0456, 7/30/87, due to a high pressure signal caused by closure of a main steam isolation valve (MSIV). The MSIV closed shortly after the air supply to the valve (NS-04A) was lost due to air leakage which became evident immediately upon initiating the routine MSIV 5 percent closure test. In anticipation of the trip, operators had commenced a load reduction and were able to reduce load from full power to about 70% before the MSIV went fully closed. No relief valves lifted.
Plant response was normal and reactor water level was in control at all times.                                                                       The shutdown may last three days while repairs to equipment are made. The licensee intends to issue a press release. The State of New Jersey has been informed.
CONTACT:              Bateman                 Blough (609) 693-0717                 488-1146 DISTRIBUTION:
H. St.                         MNBb            Phillips                    E/W                                      Willste      Mail: ADM:DMS Chairman Zech                  EDO             NRR                                                                  NMSS                 DOT:Trans only Comm. Bernthal                 PA                                        OIA                                        RES
  'Comm. Roberts                    OGC                                       AEOD                                                    NRC Ops C:t Comm. Carr ACRS                            Air Rights                                  INPO----
SECY                            SP                                        NSAC----
CA POR                            Regional Offices                                                                TMI Resident Section RI Resident Office Licensee:    ~
(Reactor Licensees)
Region I Form 83 (Rev. July 1987) l gBog38870730                                                                                                                                           I PNO-1-B7-070       PDR                                                                                                                         ,lO. [O ,
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