ML17207A808

RO 335-80-4:on 800124,feeder Breaker from Startup Transformer B to 4160-volt Vital Bus B Was Open.Caused by Improperly Labeled Breaker.Breaker Cubicles a & B Were Locked & Are Checked Daily

ML17207A808
Person / Time
Site:	Saint Lucie
Issue date:	01/25/1980
From:	Wethy C FLORIDA POWER & LIGHT CO.
To:
References
NUDOCS 8002110517
Download: ML17207A808 (4)

Text

REGULATORY 'ORMATION DISTRIBUTION SYS (RIDS)

ACCESSION NBR;8002110517 DOC DATE: 80/01/25 NOTARIZED; NO DOCKET ¹ FACIL:50-335 St. Lucie Planti Unit

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ii Florida Power 50-389 St ~ Lucie Planti Unit 2i Florida Power 8 Light Light Co. 05000335 05000389 L Co.

AUTH ~ NAME AUTHOR AFFILIATION HETHYzC ~ MD Florida Power 3 Light Co, RECIP,NAME RECIPIENT AFFILIATION

SUBJECT:

RO 335 80 Agon 800124: feeder breaker (284 5) f r om B star tup transformer to B 4160V vital bus was open, Caused by improperly labeled br esker,Breaker cubicles A 8 B have been locked II are survei ed dai y 1 1 1 ~

DISTRIBUTION CODE>> M007S COPIKS RECEIVED:LTR L ENCL + SIZE>>

TITLE: LER (Backf i t)

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NOTES. A RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL INTERNAL: EG FILE 02 NRC PDR 04 AEOD NSIC

'PA R IRELAND S HANAUER EXTERNAL: 03 LPDR

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TOTAL NUMBER OF COPIES REQUIRED: LTTR 10 ENCL tq

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POST OFF IC X 128, FT. PIERCE, FLORIDA 33450 CMW-PSL Ltr Bk f/ 837  :

Copies to: CtR, JHB, CAW, GMV, RRJ c FLORIDA POWER BIGHT COPIIPANY Offsite: ADS, JRB, COW, MAS, REU, KNH I7 I January 25@.980 To: Mr. J. P. O'Reilly, Director, Region II Office of Inspection and Enforcement ~i 0 U. S. Nuclear Regulatory Commission Atlanta, Georgia 30303 From: Mr. C. M. Wethy, Plant Manager St Lucie Plant DPR 67

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Florida Power 6 Light Company Miami, Florida

Subject:

hiEMO FOR FACSIMILE TRANSMISSION TO CONFIRM PROMPT REPORTABLE OCCURRENCE 335-80-4 IMPROPER ELECTRICAL LINEUP This memo is to confirm the telephone notification made to Mr. Martin of your office on 1/24/80.

At about 3:00 PM on 1/24/80 it was noted that a feeder breaker (2B4-5) from the B Startup transformer to the B 4160V vital bus was open. This condition had existed since 5:00 PM on 1/18/80 and was not in compliance with T.S. 3.8.1.1. Action a. regarding offsite A.C. power supplies which require testing of the "B" Diesel Generator (D/G) every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> when the "B" Startup transformer is out of service and limits the out of service period to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Additionally for 5-1/2 hours on 1/24/80 the A D/G was taken out of service for periodic maintenance. The sur-veillance requirements and time limits of T.S. 3.8.1.1. Action b. were met. Also the B D/G was tested satisfactorily on 1/18/80 and again on 1/24/80 so it was operable during the period in question as was the "A" "A" D/G.

Startup transformer, and (except for the period on 1/24/80)

The breaker was closed by 3:15 PM on 1/24/80. The apparent cause is an improperly labeled breaker. For interim protection until this matter has been thoroughly investigated, the A and B breaker cubicles have been locked and are being surveilled daily. (The breakers were checked every 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> until this action was completed.) Also, no switching orders on this system will be performed until we are sure the problem has been thoroughly investigated and is fully understood. Investigation and eval-uation will be continued and final results including further corrective action will be reported.

ethy Pl nt Manager St. Lucie Plant CMW:RRJ:bmh 699@TI~

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