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)

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

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P. O'Railly, Director Kegiorf Tl Uffice of Xnspection and Enforcef",.i'nt U.

ST Nuclear Pcgulatory Co~issioT5.

Atlanta, Georgia 30303

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t. Lucie Plant DPK 67 gloxida Power 6 Lip'tft Cotlpany Ififcmi, l'lorida Lb)eat:

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. OCCUR)'1'llf'F. 335-80-l3 0

I Diesel Generator 'Field hiring Error

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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.

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'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

'86 wire) vere replaced and tha "A" D/G then accepted fulL 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 per-.'or".~cd and both units accepted the loading sequence and (partial),

load refection and restart, per the. applicable Tcchniea1 Specificati YoTi+y

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.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 initially to do this in a t'ai,porary r:armer.

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

'er the Technical Specifications.

The schedule for thip cannot be 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 g I

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