View source for PNO-V-81-025, on 810426,onsite Seismic Trigger Tripped Alarm. Some Licensee Personnel Stated That Slight Earthquake Was Felt During Time of Alarm Trip.Upon Insp of Facility,No Damage Was Found

{{Adams
| number = ML20198R580
| issue date = 04/27/1981
| title = PNO-V-81-025:on 810426,onsite Seismic Trigger Tripped Alarm. Some Licensee Personnel Stated That Slight Earthquake Was Felt During Time of Alarm Trip.Upon Insp of Facility,No Damage Was Found
| author name = Chaffee A, Sternberg D
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000206
| license number = 
| contact person = 
| document report number = PNO-V-81-025, PNO-V-81-25, NUDOCS 9711130323
| 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      h                                         [ ctrl.N PREllMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V: 81-25 Date: April 27,1981 This preliminary notiNcation constitutes EARLY notice of events of POSSIBLE safety or public
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             !st significance. The infomation"present'ed'is a's"iWitially received without veriflcatior                "'
luationhand is basically all that is know'njb7TEls,taff on this date.
Facility:       Southern California Edison Company San Onofre Nuclear Generating Station Unit No.1 San Clemente, California Docket No. 50-2D6 i

==Subject:==
EARTHQUAKE AT SAN ONOFRE UNIT 1 The Resident Inspector at San Onofre Unit I was informed by the licensee at approximately 5:15 a.m. on April 26, 1981, that the onsite seismic trigger tripped an alam (.0lg) at 5:12 a.m. Some licensee personnel stated that they felt a slight earthquake at that time.
Tha Cal Tech Seismological Lab has been quoted in the media as recording a earthquake of Richter magnitude 5.6 at 5:09 a.m. in Westmorland, California, approximately 125 miles east by southeast of the Unit. The licensee inspected the facility in accordance with its procedure. No damage was found.                                                                                        <
San Onofre Unit 1 has been shutdown since April 11, 1980. for repair.
This item is closed for purposes of updating.
Media interest (in this earthquake) has been high, but not directed at this facility, pqRC does not plan on issuing a news release.
    /       T (Inspectorat0830on4/27/81.jn              V (San This      Francisco) information         received is current as of notification 0830 on 4/27/81. of this occurrence from the CONTACT:      A. E. Chaffee, FTS 463-3746                      D.M.Sternberg,FTS4g-3737 FO          w          in
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* PNO-V-81-025         PDR                                             %n .'       -          5 N          =
Distribution:                    Transmitted H St.
Chaiman Hendrie                  Comissioner Ahearne                S. J. Chilk,-SECY Commissioner Gilinsky            Commissioner Bradford              C. C. Kamerer, CA ACRS                                (ForDistribution)
Transmitted:            MNBB: li t oA _ ,      P. BLDG: ll 100        IE: TAS                     (IE:HQOist.)
W. J. Dircks EDO                               H. R. Denton, NRR C. Michelson, AEOD                            R. H. Vollmer, NRR         MAIL: R. G. Smith, 50 J   l. Fouchard, PA                           T. E. Murley, NRR                 *S. Ebbin
      /      \ Haller, MPA        ,.                 D. F. Ross, NRR                       IE:TAS                          ,'
f       j Kerr, SP W K. Shapar, ELD J     -1 U           D. Eisenhut, NRR                      Document Mgt. Br.              '
S. H. Hanauer, NRR                    (For PDR/LPDR)          g ]
REGIONAL OFFICES:
Willste Bldg:
J. G. Davis, NMSS                                           h               I R. B. Minoque, RES _
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PRELIMINARY NOTIFICATION
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