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 M FLORIDA POWER & LIGHT CO.
To:
References
NUDOCS 8004030167
Download: ML17266A160 (2)

Text

.-ak.894 P.O.OOX 5ZG, FT.PIP fICP., FL 3345(Io+Ifr, J.P.O'Railly, Director Kegiorf Tl Uffice of Xnspection and Enforcef",.i'nt U.ST Nuclear Pcgulatory Co~issioT5.

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.OCCUR)'1'llf'F.

335-80-l3 0I Diesel Generator'Field hiring Error~~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 i'a 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'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 1,0500ÃI, 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-f C: 90~P5 lg C)-3f")u),;."5 qir 5 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 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.

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