ML19270G986

LER 79-041/03L-0 on 790606:2B Recirculation Motor Generator Set Field Circuit Breaker Tripped Open.Caused by Failure of Potential Transformer in Voltage Regulator Circuit. Transformer Replaced

ML19270G986
Person / Time
Site:	Dresden
Issue date:	06/15/1979
From:	Dunbar J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A926	List: ML17173A925 ML19270G986
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7906220291
Download: ML19270G986 (1)

Text

....%.t. .. m . . . . . . .. . . _ .17-778'

i. . LICENSEE EVENT REPORT CONTROL BLOCK:  ! l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 6 lo t l I l L l D l R l S l 2_j@l 0l0 l- l Ol 0l 0l 0l 0 l -l 010 25l@l 264 l I l 1 l 1 l 1 l@l57 C lA1 53 @

7 8 9 LlCENSEE CCOE 14 13 ucENSE NUMt;ta LICENSE TYPE .10 CCN'T 7

0 1 d

5$0c W hl0l5l0l0l0l2l3 l7 hl0 l6 In IAI7l0lh 0lAlt !4!7 l o lh 60 61 DOCKET NuveEn G3 G9 Ev tint CATC 74 75 REPORT DATE a0 EVENT CESCRIPTION AND PROGABLE CCNSEQUENCES h o I y 1 l During normal unit operation the 2B recire MG set field circuit breaker tripped open. l o 3 l In accordance with Tech Spec 3.6.H4 the speed of the remaining recire pu=p was l n 4 [ immediately reduced to less than 65%. This event has minimal safety significance l ois 1since the 2A recire pump rem ined operating. No previous occurrences of this nature  ;

o is i L have been reported. l oI7 l l 0l8 l l 7 8 g 60 SYSTEtt CAUSE CAUSE - Cov P. VAtvE COCE CODE SU3 CODE COM?ONENT CODE SUSCOCE SUCCOCE

_p ! O l C l 3 lh lE lh l A lh l II N l S l T l R l U lh lE lh lZj @  ? G 9 10 11 12 13 18 la SECUE N TI AL OCCURRENCE REFCRT HEVIS' Oft LE A RO EVENTYEAR REPCHTr 0. .

CCCE TYPE NO.

h,REPC u BE l7 4 [--j l 014l1 l l/l l013 l l Ll l-l 0l 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT Swi tTDC'.%N ATTACHMENT P.Pn D-4 PRIVE CCitP. CO V P C '.' E NT T AK E's ACTICN O! PLANT METHOO HOURS SUOWTTE D PCH Ni bCB. SUPTI.tER MANUFACTURER

[A,j@l2l@

33 34 l35 Bl@ lZ lh 10 l 0l 118l lNl@ lYl@ l N lh 3G 37 40 41 42 43 l44H l 1 ! 5 l 71@ 47 CAUSE CESCRIPTION AND CORRECTIVE ACTICNS h i 3 ICause was the field circuit breaker tricoinz open due to failure of notential I i i itram former in voltate reau'lator circuit. Faulty transfor er was reolaced and the I i 12 l pumo restarted satisfactorily. No additional corrective -action necessary due to I i a j singular occurrence. I i a [ l 7 s 9 80 ST 3  % PC AER OTHER STATUS CIS O RY DISCOVERY DESCRIPTION 1 5 l Elh l0 l 9 l4 'Jhl "N/A l l A lhl Operator Observation l A Tivt TY CO TENT RELEASED OF PELE ASE AuGUNT OF ACTIVITY LOCATION OF RELEASE 1 6 l Z! l2l N/A l l N/A l 7 a 3 10 1 44 45 80 pen 00NNEL EyPOSUHES PdUUtiE R TYPE DEScaiPTIC;4 D '

1 I 7 l [ _01 0 l oj@[,,;j@l n/A l

? 8 9 11 12 13 80 PinSONNE L iNJUmES NUve tit DESCRIPTION ,

1 4Il0l0lOlhl N/A 2548 740 l

? tl 0 11 12 80 LO;3 CF Oa D AM AGE TO F AC;LtTY C.,

• TYPC OE SCniP fiON v 2 o N/A a I Zl@{3 2 33 7 906 2 20 c2 6) /

I 2 n

_ esuI'hl"StEmcN OG l ')

N/A h l 66 69

[tlIIIIIi1lIlI 30 7 na?.tr or PnroARFR John Dunbar pggu. 489 E,