ML19207B452

LER 79-023/03L-0 on 790724:during Surveillance Test,Diesel Generator 1 Output Breaker Failed to Close When Control Switch Was Actuated.Caused by Sticking Pinion on Air Motor. Pinion Assembly Cleaned,Exercised & Satisfactorily Tested

ML19207B452
Person / Time
Site:	Beaver Valley
Issue date:	08/23/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19207B453	List: ML19207B452 ML19207B458
References
LER-79-023-03L, LER-79-23-3L, NUDOCS 7908290472
Download: ML19207B452 (1)

Text

-

LICENSEE EVENT REPORT ,

CONTROL BLOCK: l 1

l l l l l 6

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI i

7 o

8 9 l P l LICLVSEE A l B CODE l V l S l 1 15l@l 0 l0 l- l uCENSE 14 0 l0 NUMdER l 0 l 0 l 0 l- l0 l250 l@l4 26 l1 l1 l1 l1 l@l57 CAT LICENSE TYPE Jo l /l$$ @

CON'T 0

7 1

8 S$Rc 60l L hl 610 l 5 l 0DOCKET l 0 lNUMB 0 l ER3 l 3 l 468 @l690l7 EVENT l 2 l DATE 4 l 7 l 9 74l@l750 l 8REPORT l 2 l DATE 3 l 7 l 980 l@

EVENT OESCRIPUON AND PROBABLE CONSEQUENCES h l'oTTI l At 0315 hotirs during performance of a surveillance test, the No. 1 Diesel Generator I ITTTl I output brea..cr failed to close when the control switch was actuated. In addition, an l ITTTl I alarm was re< sived indicating a failure of the No.1 Air Start Motors to starc the l ITlT] [ Diesel Generatet,. The diesel started on the No. 2 air start motors. The No. 2 l o e [ Emergency Diesel Generator remained operable throughout the period. I MI I o a l l 7 8 9 60 SYSTEM CAUSE CAUSE COMP- VALV E CODE CODE SUSCODE COMPONENT CODE SU8C00! SU8 CODE o 9 s

l El El@ l X l@ l 7, l@ l Z l Zl Z l Z l Z l Z l@ ]@ l Zl @

9 10 11 12 13 18 19 20 SE QUCNTI AL OCCURRENCE REPORT REVISION LE R/Ro EVENT YE A R REPORT NO. CODE TYPE No.

h Rf gu l7 l9 l l-l l0 l2 l 3l l/l [0 l 3l l30 Ll l-l 0l

_ 21 22 23 24 26 27 28 29 31 32 1K N AC 30 ON PLANT ME HOURS S8 IT D FOR1 8. 5 PPLIE MA FACTURER

[_X_j@l X l@

33 34 lZl@

3b l36Z l@ l 0l 0l Ol 0l 31 l41 Nl@ [y@ l43Z l@ Zl9l9l9l@

40 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The air start motor failure resulted from a sticking pinion on the a4.r notor. The l g l pinion assembly was cleaned, exercised, and satisfactorily tested. The test circuit I m l installed to monitor break. r control circuitry indicated the failure occurred in the I g g l canual start relays. Re.,eated cycling of these relays did not produce any failures. l 3 .; } DLC Engineering is investigating the replacement of these relays. l a 9 8a STA  % POWER QTHER STATUS dis O R olSCoVERY DESCRIPTION i s lG l@ l 0 l 0 l 0 l@l N/A l lBl@lSurveillancetesting l ACTivlTY CONTENT RELEAw o OF RELEASE AMOUNT OF Ar TIVITY LOCATION OF RELEASE i 6 l Z j @ l Zl@l N/A l l N/A l 8 9 10 II 44 45 80 PERSONNEL EXPOSURES NUM5J E R TYPE DESCRIPTION 39I 3 l0l0l0l@lZl@l N/A l PERSONNE L INJU IES NUMBER DESCRIPTION 1 a 8 9 l0l0l0!@l 11 12 N/A ,

EO l

LCSS OF ra OAMAGE To FACILITY43O Tut otSCniPTios V 7 9082 904 Q 1 3 8 3 lZl@l 10 N/A $h 722

.s l 80 l

TSU E

• 2 o Ld8lDE CRIPTION N/A I LLU i I I I I I I I I I 8 9 10 68 69 80

• T.

NAME OF PREPARER PHONE: 412-643-1258