05000333/LER-1981-004-03, /03L-0:on 810110,emergency Diesel Generator D Exhibited Load Swings (Hunting) & Tripped on High Circulating Current.Caused by Defective Regulator Droop Switch.Switch Replaced in Both Emergency Power Sys

/03L-0:on 810110,emergency Diesel Generator D Exhibited Load Swings (Hunting) & Tripped on High Circulating Current.Caused by Defective Regulator Droop Switch.Switch Replaced in Both Emergency Power Sys

ML20003B479
Person / Time
Site:	FitzPatrick
Issue date:	02/09/1981
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003B478	List: 05000333/LER-1981-004, Forwards LER 81-004/03L-0 05000333/LER-1981-004-03, /03L-0:on 810110,emergency Diesel Generator D Exhibited Load Swings (Hunting) & Tripped on High Circulating Current.Caused by Defective Regulator Droop Switch.Switch Replaced in Both Emergency Power Sys
References
LER-81-004-03L, LER-81-4-3L, NUDOCS 8102120227
Download: ML20003B479 (1)

LER-1981-004, /03L-0:on 810110,emergency Diesel Generator D Exhibited Load Swings (Hunting) & Tripped on High Circulating Current.Caused by Defective Regulator Droop Switch.Switch Replaced in Both Emergency Power Sys

Event date:
Report date:
3331981004R03 - NRC Website

text

NRC FORM 366 U. s NUCLE AR REcVLATORY COMMISSION (7,71)

LICENSEE EVENT REPORT (D

cONinct etoce l 1

l l

l l

l@

cPLE AsE PRINT OR TYPE ALL REQUIRED INFOnMATIONI v

l0 l1l lN lY !J l A lF l1 l@l010l-l0 10 l0 !O I-lO!01Ol@l4!1lIlIIil@l I

l

,,-u@

, 2 uCEssu =

14 ua.a sver a

a uasu - o c c*r T I3!'I C,] l L 1@l 0 [ 5 l0 l 0 l0 13 ! 3 13_J@l 01 1 [ l l 0 l 8 l 1 l@l 0l 2l 0l 9l 81 1l@

I 6>

61 D,)C A E T s.ve i a od 63 E v ENT O ATE 14 75 HE80 4T C AT E bJ EV ENT DNCPIPTICN ANO 8'90S ACLE CO'.0EQUENCES h la lil I Durin, normai operation. while conducting surveillance to satisfy Ts h_q 1 l

[o i ; ;

Emergency Diesel Generator D exhibited load swings (hunting) and then tripped on 1 lo !. ) I high circulating current.

Initial operation (startinc and force naralleling I

loit!I with EDG-B) was satisfactory.

The redundant emeroency diesel system and off-I i

l a i61 l site opwer were available and ope.rable at all rimos.

Nn significant hazarA I

l0 ! ! !

exis.ted.

]

i i-1 !

J ec e 3 S v 0 T F '.1 CAL!E Ca C E C048 VA a Y 000E 0.Z E SLS20 'E CO*7.NE'.TCOOE SL5CO;E SJ Z!

Ic!"1 i E! El@ [ El@ l Alh l C! K! Tl Bl Kl Rl@ l El@ l zl @

t s

9 1s 1e 1

12 13 is

• E GL.NTa A L CCCJ G P E NCE F E 'O s; T A E W 5 8 0 '.

@ A".;f,lL:.8 !1 I

,ina-E. E ', ' = E A A DES 0 *T NO CODE TYPE NC I

l-l I010! 4!

Iel 1 0! 3I LLJ l-!

l0l

4 u

u u

v n

A,

..,E E., m e. =. s Arms.E. T som: 4

,~ vE = v.

ev. E.T

'AE.

A;Ti;.

CN PLA'.T YET";;

HOLAS..

SLP.iTTED F O A M.w E.

SLPOUEH YANU aCT RE2

' C_jg( z l@

1zl@

l z l@

J 0 ! 01 01 al IN l@

l Y l@

! A l@)

lCI7I7lO!(

43 41 42 43 44 47 3

.2

.O

Ausc tE::cioTiON A.o ccaREcirn ACTecNs @

l1 i J.J '

Cause of the failurn was a dofociivo rogularne arnnn cutern Joeration under I

1~i 1I emergency conditions (LOCA or loss of normal onwer) would nnt havn hnon I

,,,,i effected because the switch is used only for test.

Switch was replaced in l

[ i,; l both emergency power systems.

No additional action is required.

LER 80-056 l

[... i t is a related event.

I 2

a 3 eo FA '

'v VETwCDOF ST AT A

% 60 EG CTaE R ST A TL5 O Ci;;0,59Y DiSCCVERY OE!;R'PTION --

I !a l lE j@ ll 10 l0 l@l NA l

l B !@l Surveillance l

7 s

)

9

12 13 44 45 46 PJ A ;TI V' T y C O N T L *.T DELI 45ES 088ELEAie AVCL%T CF ACT:W Tv "-

LOC ATION CF FEr.E UE -

('

C NO

• ! ?.

d 3 10 ft 44 db dJ PER50'.NELf*fC% AE5 350CNPT'CN @p NLvoEA TY3E I!>l10!c10j@!zl$1 nA I

7 d 3 11

'2 13 60 PU-LC%'.E L INJW E S

%..' ? F 4 O EC"P P T O'.

l' l- ! l 0 ! O ! G lhl NA ham l

',:n:' cL:h? l.? : "" @

b[

/1

[

l JJhi2 j

lt j > j l 2 6'l NA

'-~

- v so sbts;a.T c.O [2t j iNiui NA l

l!!!!III!l!'ll 7

3 w

65 69 50 3 W. O rne Childs

'41 c-3L 2 - 3 8 L O

?

e...cy

, g.g-8 4 o s i a c a. g

,m ;y,p