05000247/LER-1981-017-03, /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

/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: 05000247/LER-1981-017, Forwards LER 81-017/03L-0 05000247/LER-1981-017-03, /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
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8108100226
Download: ML20009H544 (2)

LER-1981-017, /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

Event date:
Report date:
2471981017R03 - NRC Website

text

W LICENSEE EVENT REPORT CONTHOL BLOCK: l l

l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI R l N l Yl I lP l S l2 l@[0_ l 0 l -l 0 l 0 l Ol 0 l0 l - l 0l 0 l@l 4 l1 l1l1l1l@l l

l 6-e a 9 ucENstE coni i4 a

uceNst NuvaEH 23 m

tu%t nn e.

.,u

.s 1 l8dlI

.u.i

',','[,";' l Ll@[_015_l0 l 0 l 012 l 4 l 7l@l01613 l 0 l811 l@l nl 71 3

0

.. i t,r..n E T NuvutH est 80 kVE"f T U ATE 14 4'

Ht P0H l u A l t N

f M

e4 L. I s

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.

l tie in of EDG No. 21 (Tech.

,nj.,j g ockout relay. prevented the automatic g,,,,, Spec. 3.7).

The normal feed breaker was reclosed restoring power to gogcjlthe affected bus section.

This event occurred on June 30 and July 8, 1981.

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 l E l El@ l El@ l Alh l Cl K l Tl B l Rl K lh Wh [Z_] h 9

10 lt 12 12 f tf t9 20 i

e SEQUENTI AL OCCURRENCE REPORT REvii0%

EVENT VE AR REPORT NO.

COOE TYPE NO tt e 40

@ ry.Lar 18111 l-l 10 l l i 71 1-1 10131 lL l l-l U

_ 21 22 23

4 26 27 23 2'J JJ at 3;

IJA i

E' 4

O ON PL NT

'E T HOURS SB si FOR 9 9.

SUPPLIE (A_j@lZ_j@

l Z l@

W@

l 0 l 0l q 0l lYl@

lN lg W@

[W l1 l2 0 33 J4 35 J6 31 40 41 42 43 44 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 and the subject breaker returned to normal service.

,., i i'

7 4 3 STA S

% POWE R OTHER STATUS DISCO Y

DISCOVERY DESCRIPTION 32 J@.l 1l0 l 0 l@l NA l

l A l@j Control Roon InstrumentaElon i a A TlVITY CONTENT AELEASED OF RELE ASE A\\tOUNT OF ACTIVITY LOCA? TON OF RELE ASE NA l

l NA [ZJ @

gl 1 6 44 45 f;

7 8 9 10 31 PERSONNEL FxPOSuut$

NUMBER TYPE DESCnlPTION 39

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

,ERSONNE t iNJu'JiES oESCRiPiiON@

NuenE n Q [ 0l 0 l 0J@l NA l

N 7

8 9 tt 12 LOSS OF On DAVAGE TO FACILITY TYPE DE:'CfiiPTION NA l

, 8 l ZJ@l t.?

7 8 9 _

IQ eSSUt t DESCHIPfiON I

i tiiiiiiii!il!

ETsliNiAl NA

' 8108100226 810730 se 69 rs PDR ADOCK 050002

. Margaret Offerle PHONE:( 914 ) 526-5256 o

.]

Pf Lin a

/

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 series over current tripping device associated with the West-i 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