ML20009H544

LER 81-017/03L-0:on 810630,feed Breaker for 480-volt Bus 5A Opened & Associated Lockout Relay Actuated.Caused by Defective Westinghouse DB-75 Breaker Tripping Device. Device Replaced

ML20009H544
Person / Time
Site:	Indian Point
Issue date:	07/30/1981
From:	Offerle M CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20009H541	List: ML20009H540 ML20009H544
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8108100226
Download: ML20009H544 (2)

Text

W . .

LICENSEE EVENT REPORT lh CONTHOL BLOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI l l 6-RlN e a 9 l Yl ucENstE I lP l coni S l2 l@[0_ i4 a l 0 l -l 0 uceNst l 0 lNuvaEHOl 0 l0 l - l 0l230 l@l m 4 tu%tl1nnl1l1l1l@l e. .. .,u .s

.u.i

',','[,";' 3 1 0 l8dlI f

.. i M

le4Ll@[_015_l0 l 0 l 012 l 4 l 7l@l01613 L. I t,r s ..n E T NuvutH est 80 l 0 l811 l@l nl Ht71 kVE"f T U ATE 14 4' P0H l u A l t N kV kNI UFbtHIPilON ANQ PHGo Autt CUN'iLOUENCES O'o y pg [During normal operation, feed breaker for 480V Bus SA opened and the This p l lockout relay associated with this bus section was actuated.

,nj.,j g lockout relay. prevented the automatic tie in of EDG No. 21 (Tech. _

g ,,,,, Spec. 3.7). The normal feed breaker was reclosed restoring power to This event occurred on June 30 and July 8, 1981.

gogcjlthe affected bus section.

lo Ii[ [ Similar event LCR 80-09, 1 O Id Il SYSTENT ;AUSE CAUSE COYP VALN E CODE CODE SuBCODE COYPONENT CODE SUSCODE SUSCOCi loI9l e

l E l El@ l El@ l Alh l Cl K l Tl B l Rl K lht9 Wh [Z_] h 9 10 lt 12 12 f tf 20 i

SEQUENTI AL OCCURRENCE REPORT REvii0%

EVENT VE AR REPORT NO. COOE TYPE NO

@ ry.Lar tt e 40 18111 l-l 23 10 l l i 71

4 26 1-1 27 10131 23 2'J lL l JJ l-l at U3;

_ 21 22 HOURS SB si FOR 9 9. SUPPLIE IJA .- ..

i E' 4 O ON PL NT 'E T (A_j@lZ_j@ l35Z l@ W@ l 0 l 0l q 0l 31 40 lYl@

41 lN lg W@ [W l1 l2 0 42 43 44 .

33 J4 J6 CAUSE CESCH4PTION AP.D COARECTIVE ACTICNS h li!,;iApparent cause was the premature operation of a series over current _

[i.;,jl tripping device associated with a Westinghouse type DB-75 breaker iresulting in normal' feed breaker opening and lockout relay actuation.

,,,,,lThe defectiveI tripping device has been replaced and tested satisfactorily

, ., i and the subject breaker returned to normal service.

i' 7 4 3 STA S  % POWE R OTHER STATUS DISCO Y DISCOVERY DESCRIPTION 32

i a J@ .l 1l0 l 0 l@l NA l l A l@j Control Roon InstrumentaElon A TlVITY CONTENT AELEASED OF RELE ASE A\tOUNT OF ACTIVITY LOCA? TON OF RELE ASE '

NA NA 1 6

[ZJ @ 10 gl 44 l l 45 f;

7 8 9 31 .

. PERSONNEL FxPOSuut$

! NUMBER TYPE DESCnlPTION 39

• NA

! Q [ 0l 0 l0 l@l Zl@l

' ,ERSONNE t iNJu'JiES NuenE n oESCRiPiiON@ l Q [ 80l9 0 l 0J@l NA 7 tt 12 ,

N LOSS OF On DAVAGE TO FACILITY TYPE DE:'CfiiPTION l

8 l 8ZJ@l 7 9_ IQ NA t.?

eSSUt t DESCHIPfiON ETsliNiAl

' 8108100226 810730 NA . I se 69 i tiiiiiiii!il!

. rs o

PDR ADOCK 050002 . Margaret Offerle PHONE:( 914 ) 526-5256 a

.] _ _ _ - _ _ _ _ _ _ _ _ _ _ Pf_Lin

/ ATTACHMENT Docket No. 50-247 Consolidated Edison Co. of N.Y., Inc.

LER-81-017/03L-0 Indian Point Unit No. 2 During normal operation an apparent premature operation of the i

series over current tripping device associated with the West-inghouse type DB-75 normal feed breaker for 480V Bus Section SA caused the autom,atic opening of the normal feed breaker-and the actuation of the bus lockout relay. . Emergency Diesel Generator No. 21 was prevented from tying in to Bus Section SA due to actuation of this lockout relay. The normal feed breaker was recl'osed in 5 minutes on June 30, 1981 and in 22 minutes on July 8, 1981 restoring power to the affected Bus Section. Following the event of July 8, 1981, tne lockout ,

relay for Bus Section SA was removed from service pending testing of the normal supply breaker.

The sudden trip of the subject breaker has been determined to be attributable to a defective over current tripping de-vice. The over current device has been replaced and teeted satisfactorily and the breaker and its associated lockout re-lay returned to normal service.

9

$$m -

S 9  ! g 4

- , - - - < e - - .-