ML20004C350

LER 81-004/03L-0:on 810306,during Normal Operation,Relay 27x3/1G Found de-energized.Cause Unknown.Relay Replaced. Operation Verified.Corresponding Relay for Redundant Sys Found Operable

ML20004C350
Person / Time
Site:	Cooper
Issue date:	04/02/1981
From:	Bednar L NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20004C349	List: ML20004C348 ML20004C350
References
LER-81-004-03L, LER-81-4-3L, NUDOCS 8106030232
Download: ML20004C350 (1)

Text

__

, o N.~M PORM 364 U. S. NUCLEAR 7.EGULATORY COMMIS$40N 87 7H ,

• LICENSEE EVENT REPORT CONTROL 8 LOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INPoRMATION) 7 O i 8 9 l Nl El Cl Pl Rl 1l@l16 0l 0l - l 0 lLICENSE LICENSEE CODE le 0 l 0NUMaER l Ol -l 0l 01 0'@l 2h 4l1 26 l 1l 1l 1l@l57 CAf LeCENSE TYPE Jo l J@64 CON'T .

E i 8 0% i Li@l015 60 46 l0 l OOCKET 010 NUMBER l 2 l 9 l 8 64l@l6901 31 01 61 81 ll@l 0l REPORT EVENT OATE 74 7S 410l DATE 21 81 80il@

EVENT DESCRIPTION ANO PROSA8LE CONSEQUENCES h O During normal operation while performine a desinn modificsefon. ir una noted ehne l E frelay 27X3/1G was deenergized. The relay coil was found open. No other significant l ITTTI loccurrence took place. Redundant systems were operable. This event presented no ad- 1 IOlsi iverse ef fects upon public health and sa,fety. The failed time delav relay could have l E In11nt. rad ehn no nuenne hvenker en einem nur nf aannanen vieh the correspondine FDR I O 7 lbreakers to the critical power bus. l I O I st 1 l l 7 se s0 06 4006 SL,sc E COMPONENT CODE busCODE EU F

O 9 8 9 I E l E l@ [E,J@ y @ lR l El Ll Al Yl Xl@ ]@ @ @

10  : IJ 13 til 19 Ju SEQUENTI AL OCCURRENCE REPORT REVISION

,_ EVENT YEAR REPORT NO. CODE TYPE NO.

@ ,=LE R,Ro 1 81 11 21 22 L--J 23 101014l 24 46 Ld 27 1 01 31 28 29 i LI 30 l-J J1 l 01 32 TA kN A O ON P NT U T HQURS 58 11 POR b. SUP L MANUP CTURER LCJ@l_Gj@

JJ J4 L Zj@

JS L.Z.j@ l 0l 01 0l 0l 37

[N_J@ l l@ lA l@ K[ p p l@

36 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i 10 I IThe cause of the Agastat Model 702*?C relay coil failure could not be determined. l i i IThe relay was replaced and its operation verified. The corresponding celay for the I i , Iredundant system was checked operable. The two relays have been included in a sur- l L2 L ] Iveillance orocedure scheduled each refueling outage. l i 4 l I 1 e o so STANs *.POWE R OTHERSTATUS 015 RY OISCOVERY DESCRIPTION yl $@ l 0l 9l 2l@l NA l l Clgl Electrician Observation l

' Adriviiv CO4 TENT LOCATION OF RELEASE @

t l 6 RELEASE @O OF 8 3 iO 11 AMOUNT RELE NA Ast@lOF ACTIVITY 44 l

45

@l _ ,

NA l 80 PER$0NNEL f xPO$URTS NOV8ER TYPE DESCRIPTION LLI7]Io10l0l@l hl" NA l PERsONNd'iNJUdits NucaER DEscriPfiON@

i n NA

' te l O l 0 l 0l@l

't 18 i2 l '

80 L u'.S Of Fi OAMAGE 13 P ACILITV TYPE DE $CHtP TION LLI2J t 4 l_zJ@l

'6 10 NA I 30 3*.? Ut i 184 GillPIlON * '

I'7Tiil L.sJ'81 NA l lIllIlliIIIl!i t a 3 to 68 69 80 5 L.F. Bednar 402-825-3811 o NAME CF PAEPARER PHONE: $

8le6030J Y