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

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

ML20126C017
Person / Time
Site:	Crystal River
Issue date:	02/06/1980
From:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-80-037, PNO-II-80-37, NUDOCS 8003250060
Download: ML20126C017 (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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1. O O:3 PRELIMINARY NOTITICAT3ON - -

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