ML19256G552

LER 79-049/03L-0:on 791129,after Completing Surveillance Testing of Diesel Generator A,Auxiliary Trip Relay Annunciator Did Not Clear.Cause Undetermined.Phase a Target & Differential Lockout Reset

ML19256G552
Person / Time
Site:	Pilgrim
Issue date:	12/28/1979
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256G551	List: ML19256G550 ML19256G552
References
LER-79-049-03L, LER-79-49-3L, NUDOCS 7912310454
Download: ML19256G552 (1)

Text

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LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL MQUIRED INFORMATION) o i lu (Inlpls 1 GI ni nl d n oln n n l n n i n25 l@l 26 aLICENSE l ,ll iTYPE t l Joi @57 CAT l l 58 @

8 9 LICENSEE CODE 14 15 LICENSE NUMBER CON'T o 1 8

5O[RCE 60 l0!9 61 n! 10 2l9l1 hl1 11 I? l4 l7 lo h 1I9 l'l9 I7 Io Ih DOCKET NUMBER 68 69 EVENT DATE 74 ?S REPORT D ATE 30 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES h o 2 l On November 29. 1979. after comnioring vnnrino en m o411,nnn e.,ee4n3 nc "s" 94negl l Generator. The Aux. Trin Relav a nn+m c in c or did nne clo,r- Tnvoer43,rinn nf rho l 0 3 i 0 4 [_ diesel Renerator outnut brontcar roup, lod ,, nff#nennri,1 Un1,, ph,en "A" *,v3e e I o 5 l was dropped and the Differential Locteour trinnnd Tho dicen1 ganar,rne **,e

. 1 0 6 l declared inonerable and rodundant enceing cnnducenA in ,cnnrA,nco "4*k I O 7 l Technical Specification 3.9.B.4 Public Health and Safety were not affected. I o 8 I l

80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SU8 CODE SUBCODE 7

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lC l 1:' l 9 to 11 12 13 cl E N El RlA h lD 18 19 h Wh 20 SEQUENTI AL OCCURRENCE REPORT REVISION LER AO EVENT YEAR R EPORT NO. CODE TYPE N O.

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_ 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHVENT NPRD4 PRIME COMP. CCMPONENT TAKEN ACTION ON PLANT METHOD HOURS 22 SUBMITTED FORMbuB. SUPPLIER MANUFACTURER dhdh 33 34 dh 35 (7dh 36 3/

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44 11 !3 ln l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 o I Electric Lab ner<;onnal 4nuncrig,end nnee.hin causes for this event and vera l i 3 unable to find any electrical faults. The phase "A" target and Differential I

, 7  ; Lock Out were reset and diesel generator operability test nerformed with no

, 3 l recurrence of the trip. l i 4 I i

7 8 9 80 ST S  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTIO J i 5 El@ l 1 0 Olh 0 NA l l_Ajhl Onerational Event 7 8 9 10 12 44 45 46 80 ACTIVITY CONTENT

• RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I/ lei z

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45 NA 80 l

7 8 3 10 11 PERSONNEL EXPOSURES NUMBER DESCRIPTION i 7 l0 01 0lhlTYPEZlhl "

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'. L4 e ,eRso~~e N v h NUVBER DESCRIPTION 1657 188 7

1 a d 9 0l0l0lh! 11 12 NA 80 a

. LOSS OF CR OAMAGE TO FACILITY 43 TYPE DESCRIPTION 7 912 t31 O 1 9 d 9 I Zlh! 10 NA 80 7f PUBLICITY NRC USE ONLY

• ISSUED

[ 2J o_j l Nlh(DESCRIPTION NA l ll llllII IIIlI 7 8 9 10 68 69 80 5 NAME OF PREPARER Charles J. Mathis PHONE: (617T 746-79n0