ML17266A160

RO 335-80-13:on 800314,while Plant Was in Cold Shutdown, Field Leads to Excitors on Both Diesel Generator Units Were Found Undersized.Caused by Design Error.Field Leads Will Be Replaced & Permanent Repair Studied

ML17266A160
Person / Time
Site:	Saint Lucie
Issue date:	03/17/1980
From:	Wethy C FLORIDA POWER & LIGHT CO.
To:
References
NUDOCS 8004030167
Download: ML17266A160 (2)

Text

.-

ak. 894 P.O. OOX 5ZG, FT. PIP fICP., FL 3345(

~::epics To.'I;IH', JHB, CAQ, G'.1V, MZ

t. 0'+ii<"

.F,fsitc: AIIS, Jaa, CQl~, >~S,.RZuENu

~~w l. ~ <ffV g ygfffltlfI 'SLORIfffl PO'A'Eff IL UGHT Ca VPW Io+ Ifr, J. P. O'Railly, Director Kegiorf Tl gQN Uffice of Xnspection and Enforcef",.i'nt 'cb 17~ 1980 U. ST Nuclear Pcgulatory Co~issioT5.

Atlanta, Georgia 30303 rG. II. Vetlqr, Plant Manager YoTi+ y

t. Lucie Plant DPK 67 4y-" -f C:

gloxida Power 6 Lip'tft Cotlpany Ififcmi, l'lorida Lb)eat: k>UHO FOK FACSI'.IILE.'ERAIlSNISSiO." To Co".PIRIf PRO'=IPT REPO.".TABLP.

90 OCCUR)'1'llf'F. 335-80-l3 0 ~P5 I lg C)

Diesel Generator 'Field hiring Error ~ ~ - 3f")

u),;

."5 qir 5 One to a. design,error the field .'l.aads, to the cffcitors on both 0 units are undersized; The. pl.ant vaa in cold shutdufw when this was discovered.

i'aI i' ~

'On 3/14/80 tile D/G's vere run at design load for surveil?fiYice tasting., "A" D/G woulcl not accept full design load. During investioation of this proble;ii it was noted that the firld leads vere hot and thon, that the in"ulation was burnt. The leads wire) vere replaced and tha "A" D/G then accepted fulL '86 design load, The leads cn "8" D/G frere inspected and no daf.".agc cr I5igk teu'.perature fo',ind. 'lbs. engineering departrent vas asked to eva5uate thc problaf.-i ~ On. 3/L5/80 tha plant co~.".enced shut-dof'n and coal dovn for refueling."

On'/17/8Q (Ikoffday) at about 1,0500 ÃI, engineering reported t'llfft the leads are in ffcct unflarfcizad. They slfould be at least 3-oifpht size to handle the full field currant poiaible unde~ high load/

transient conditions. Tld.s vas confirned on the D/G units vendor prints but tive A/E instff33Iitiori draciinps incorrectly specified tice fI6 wtrei This affects the lonp terfff reliability of the D/G units.

Hovever, it sho>>ld be, noted that the A D/G wiring shof.cd darage only af ter 0 years of operation and 3 sti) 1 shows noffe. Also on 3/l6/SQ the integrated safeguards/Diesa) generator test was and both units accepted the loading sequence and (partial),

per-.'or".~cd load refection and restart, per the. applicable Tcchniea1 Specificati ons,

.oi rective Action:

1 5'>> The fÃe3d l.eadff 5:ill be im.".ediately replaced on at lefist" I D/G Due g'" to the size of the installed conduit it r:n>- be necessary to do this in a t'ai,porary r:armer. The perrfanent fix will be persued initially

~i on an erpidf-ted basis so the D/G cfcn be returned to full operability L

the Technical Specifications. The schedule for thip cannot be 'er acaiirately estimated at this tif..e. A}so, other design by the indi"iduals involved will be investigated but the. details, scope

.and schcdulc are currently unl'.nown V

I ~ ~ ~

g 8004030 I 6'Q

" . "<<~'~g~'g~tgg~-RKUlgg.A. S~f

~ 'g 'SfC7 ~Aggg,.ggggggfg!ggggggg Lm H E L P I tV G f3 I/

ggggFVAANAf~rr "A~p//gW// g 0

~

I f,. D ~

g 5fg,5ggg'eV5 t 0 TI 5 g ~

I O6

-.e'g