ML19323C080
| ML19323C080 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/14/1980 |
| From: | Igne E Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-SM-0179, ACRS-SM-179, NUDOCS 8005150009 | |
| Download: ML19323C080 (1) | |
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O ITf' THIS DOCUMENT CONTAINS P00R QUM.lTY PAGES
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March 14, 1980 l
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mms Mesters j
ACRS Technical Staff i
ERS Fellows
SUBJECT:
CAUSE & CR'lSTAL RIVCR 3 TRA.*SIDfr I
ne cause of the Crystal River 3 Transient has been determined by the Licensee to be a mismatch set of connector pins found on a printed circuit board. Se circuit board was installed only about a month ago and is used as part of the 8
circuit for the subcooling meters.
We generic aspects of this type of installation fault are under review by the
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t e preliminary notification of this event is attached.
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t i E. Igne il Staff Engineer Attac!r.ent:
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4..' PRELIMINARY NOTIFICATION '
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PNO-II-80-37 a(303 PRELDi1 NARY WOTIFICATIM OF EVENT OR UNUSUAL OCCURRENCE O.
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]~- },..This preliarinary notification constitutes EARLY noti y.
The information presented.is as initially saf ety or public interest significarde.
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Qm, 3'sd' h._ a.,g fp*Q".. -SUBJECT.:gl CAUSE.Of CRYSTA.L RIVER TRA.NS a.7 a :
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,during investagstion
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...w CM~m,.,.7,+ 4..- >. s Ff;. irf The, licensee;y.m
.t*.,. nny.g..,4~1nto ~the-cause of the February 26 ' transient-.
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Fit:yT:enJ.heJrysYa'11Rivei?3'-facility has' established the sourcT of the power fail a
e E-d.. i. irJ.'the 'Non Ndelesi~lnst'rEMtattois.(10TI).systas. 'A mismated set of connector
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an estension M.r~5 FiisTv7e e Yound oc 'aP printed ' circuit besidF This board. acts ' as
@.Jf4'i.tdtv7en the~ contacts aountsid in the electrical cabinet an The particular P
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- .': ' M irstems~ (buf ferW used".in control and indicator circuits.
iId~*" bufuf involied was' one ins'taned approximately one month ago, and used as pa
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The investigation indicates the of one" of the subcooling ' meters at the plant.
of original _insIts11ation. The particular sub.
[Q-E =f=== ting ocentred.:nt the time
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erratically since that installation.
N be - *coolids meter -invbhed i hasi performedthe power supplies during the transient are reenergize d and cleared the :
$,Zh Repeated attempts: to3.,..O.a f ault. Further_. investigation has found 's, similar mismated connector pin N.-,-;p presumed to.have. melt'edxthe - conducting ~ ribbon on the boar
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W-...,..anothe.r buffe_r, bu.t this mismating had not resulted in a short.
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~'"7 W Th~e "sinerie aspectii'of this type installation fault are under act ve a".'r ' the NRC s ta f f.-
The NRC does not plan to issue a
@b.. e_td the short c..ircuit.at a cime af ter installa. tion.is continuin
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N b IFM..1 Teen ~see'.'P a'ns_to lss. de i pr~ess reles.s.e.The State of Florida has
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rence by telephone from
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.M-Region U (Atlanta) received notification' of th s occur KS NRC onsite personnel at 12:00 p.m. on March 6,1980.
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Coassissioner Hendrie-
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Coassissicar Kennedy.
Distri%+. ion) 3 Commissioner Bradford 55-.-
.c. '?. Commissioner" Gilins.ky 7.~
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Sg Phillips
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Traosmitted: MNBB~
r-M. R. Denton, MRR V. J. Dircks EDO R. C. DeYoung, NRR (6 min./page}l Landow C. Michelson, AEOD R. J. Mattsen, NRR J. J. Cummings, CIA J. J. Fouchard, PA D. Vassallo, NRR 4
N. M. Haller, HPA D. Eisenhut, WRR i'
- 2. G. Ryan,.OSP.
Villste_.,_
.R. Minogue, SD R. K. Shapar, ELD J. G. Davis, itMSS KOOS S. Levine, RES Other Regional Offices C/R DIST. CHM.CMRS.PE.GICA. ~~f SE0Y. HIST. REC 3DS.
.PRELIMINART NOTirICATION g -3
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