View source for PNO-II-80-037, investigation of 800226 Transient Revealed Power Failure Caused by Mismated Set of Connector Pins on Printed Circuit Board Between Electrical Cabinet & Solid State Subsys in Control & Indicator Circuits

{{Adams
| number = ML20126C017
| issue date = 02/06/1980
| title = PNO-II-80-037:investigation of 800226 Transient Revealed Power Failure Caused by Mismated Set of Connector Pins on Printed Circuit Board Between Electrical Cabinet & Solid State Subsys in Control & Indicator Circuits
| author name = Martin R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| addressee name = 
| addressee affiliation = 
| docket = 05000302
| license number = 
| contact person = 
| document report number = PNO-II-80-037, PNO-II-80-37, NUDOCS 8003250060
| 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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Jebruary 6,1980
     ~'itIII2iIKARY NCIlFJCATION G' EVINT OR LThl:5UAL D*CGP2FSCE PNO-II-80-37 His vreliminary notificatioc. constitutes EARI.T rectice of an event of POSSIBLE safet'r er pcblic icterest sirndicance. The izfornation present.ed is as initially receive-i vitbont veri f f rarion cr' evaluation and is ba sically all that is known by 27 = t.a f f a s o f t.his da te FAiILITY: Florida Pcver Corporat. ion                                                                                  .
Cryst.a1 River 3 l
Docket Fo. 50-302 Crystal River, Florida                                                                                 l l
SC:.ECT:         CAUSI 07 CKISTAL Rl?ER TRANSIIh7 DE"EEP511NED 3e lice.asee, during inves ti g A ti oD IDtO the Caus e of the FtDruary 26 transient c: the Crystal River 3 facility has established the source of the power failure I:: the Ken Nuclear Ic.strumentation (Kil) systes.                       A aismated set of connector U pics were found ou a. prtated circuit board.                        Tn.is be,a rd acts as an extension be . vee.c tie cent.a cts acu= ted in the electrical cabi:et and solid state electronic s ub s ys t+cs (buffers) used in control acd indicate: ci:cuits.                           The particular buffer involved was cae i ns ta ll e d a pp rc xima t e l y o n e :-a nth a go , and used as part of c e of the s ubco e l i ng r.-t e r s a t the pla=*..             '~he investigation indicates the is, 4 ting c.cct rred at th e ti.2e o f o r i gina l i r.s t_a l '. a t i c a . The particular sub-
::clict ce t e r invelved has pe rf orced e r atitil ly :; d:ce that installation.
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Re;e a ted atterpts to reecergize the po-er s u;pl.i e s during the transient are                                      -
     ;rer mci te have selted tr.e ccaducti:g ribbe: ci the board and cleared the f a :.11. Further inve s tig a t io t has f oun d a sini'ar eisea.ed connector pin set on m ::1.e r bu f fe r , b ut thi s : is su tin g ha d so: res uhed is a short.
     ~he re:eric aspects ei this type ins tall a tien fa .:lt are under active review by
:le EP,C staff.            ;~ e it.vestigation by the lice:.see into tbc mechanism which led t: -le short ci r cuit a t a time af t e r ins ta lla tie: is centinuing.
7:e licensee plans to is ste a press release. T e EC does not plan to issue e                                           I
     ; ess release. The State of Flcrida has bee:: inf o rmed .                                                             I 1
Feif=n II ( Atl ant a ) t e c e ive d cotifica tion of *.his occurrence by teleptone f rom                              l
     .E ::.si te p e r s o:cel a t 12 : C0 p . . c n Ma r ch 6 , 1"-50.                                                     l C::ta rt:     R. Ma rtis , RJI 212-5534; D. Quick, R11 242-5553
     !"h t rib: tion:               Tra:puxit.t e d H . S t .
C:.airca: Ahea rne                                  Cocaissioner Eet$rie              S. J. Chill, SECY Concissioner 3radford                               Co cissioner Ec::edy              C . C . Ka me rex , CA Cmrissioner Gi1 Nky                                ACRS                               (For Distribution)
     *irr:5.eit+.ed :      tike 3                        Phillips                          XOOh/d(IE:HQ Dist.)
V. J. Dirck.s, EDO                                  H. 2. Secto:, AE C. Michelt.on, AEOD                                R . C . DeYo ung , F.R JI. J. Ecucha rd , - PA                             R. J . Ma t.t.soa . E.R            Landow             (6 eda./page;
: 4. M. Ealler, fiPA                                 D. Yassallo, FRR                   J. J. Cumings , 01A
  -2. G.-Frfan, OSP                                     D. Eiseabot, KRR
  ' E. I. Simpa r. ELD                                  Villst.e             _
MAIL J. O. Da vi s , Kriss              R. Minogue, SD Cr:.her Eegional Offices                            S. Levise, 115                     XOOS                             <
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