ML19329F905

LER 80-008/03L-0:on 800606,during Normal Operation,Testing Revealed That Relay 1-247/AO2X in Train B Would Not Drop Out to Initiate Undervoltage Trip Function.Cause Not Determined. Relay Replaced & Tested Satisfactorily

ML19329F905
Person / Time
Site:	Point Beach
Issue date:	07/03/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329F900	List: ML19329F899 ML19329F905
References
LER-80-008-03L, LER-80-8-3L, NUDOCS 8007110340
Download: ML19329F905 (2)

Text

- -- - - - - - - - o - -- - -

(7 77)

LICENSEE EVENT REPORT CONTROL BLOCC l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

[O [Il l W l Il p l B l H l 1 l@l 0 l 0 l- l 0 l 0 l 0 l 0 l 0 l- l 0 l 0 l@l 4 l1 l1 l1 l 1 l@l l l@

7 8 9 LICENSEE CODE le 15 LICENSE NUMBER 26 26 LICENSE TYPE Jo 57 CAT 58 CON'T E7 8 a

Sgy l L j@l 0 l 5 l 0 l 0 l 0 l 2 l 6 l 6 ]@l 0 l 6 l 0 l 6 l 8 l 0 l@l l l l l l l@

60 61 DOCKET NUM8ER 68 63 EVENT OATE 74 75 REPORT D ATE 80 EVENT DESCRl* TION AND PROBABLE CONSEQUENCES h f 0 Til I During normal operation on 06-06-80, Unit 1 testing IAW ICP 2.13 i r6Ti1 I (4160 V undervoltage test) revealed that relay 1-274/A02X in Train "B" l 10141 l would not drop out to initiate an undervoltage trip function. The l

[TTT1 l redundant system Train "A" was immediately tested and found to be l l o le I 1 operational. This event is reportable in accordance with Technical l 1017 l l Specification 15.6.9.2.B.1. l l 0 l0 l l l 7 8 g . * . 80 E CODE SUSC E COMPONENT CODE SUSC O'E SU E l0l9l 7 8 lE lB l@ W@ W@ l RlE lL l A lY lX l@. W@ W @

9 10 11 12 13 18 19 20 SEQUENTI A L OCCURRENCE REPORT CVISION Lgg RO EVENTVEAR R EPORT NO. CODE TYPE NO.

@ ,aEg 9 l218l0l 22 l-l 23 l0l0l7l 24 26 l/l 27 l0l3l 28 29 lLj 30 b

31 W32 TAK N A O ON PL NT ME FOURS 22 58 IT FOR 8. MAN FACTURER Wg SUPPLI l33A lgl34Z lg 35 l36Z l@

l 0 l 0 l 0 lU l 3/ 40 l Ylg l Y lg l N jg lW l Il2 l 0 lg di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h LLI.o_J l The relay was replaced on 06-06-80 and Train "B" was tested satisfactort-g lily. The cause of the failure of the Westinchouse tvoe NBFD665,,,glay I

, , , ,1 l could not be determined. Bench testing of the relay proved it to be l

, 3 l fully functional under simulated operating conditions. l i 4 l l 7 8 9 80 SA S  % POWER OTHER STATUS IS RY DISCOVERY DESCRIPTION i s W @ l0l8l0l@l ' '*

N/A l g gl Technician observation l

' " " 88

' elTiviTY CO0 TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 KELEASE@D OF RELEASE @ll N/Al N/A l PERSONNEL EXPOSURES NUM8ER TYPE DESCRIPTION i

1 7 l010l0l@[,Z_j@l N/A i l

PERSONN E L INJURIES NuM8ER oESCRiPTiON@

i a 8 9 l 0 l0 l 0 l@l12 N/A l 7 11 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION 1 9 [_Z_j@l N/A l 7 8 9 to .

80 DE CRIPTION

• 2 o W ISSUED @l N/A _____ 3ND l lllllllllllll$

7 8 9 10 D WKL1U T 68 69 80 5 NAME OF PREPARER

• Y PHONE:

e, -

ATTACHMENT TO LICENSEE EVENT REPORT NO. 80-008/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 During normal operation on June 6, 1980, Unit 1 testing in accordance with ICP 2.13 (4160 volt undervoltage test) revealed that relay 1-274/A02X in train "B" would not drop out to initiate an undervoltage trip function. The redundant system train "A" was immediately tested and found to be opera-tional. This event is reportable in accordance with Technical Specification 15.6.9.2.B.1.

The.undervoltage trip logic is set up to trip the reactor when an undervoltage condition exists on both the A01 and._A02 4160 volt buses. The redundant undervoltage relay in train "A" - (1-273/A02X) was fully functional to operate in coincidence with either train relay from bus ,A01 to initiate a reactor trip.

The relay was replaced on June 6 and train "B" for A02 was tested satisfactorily. The cause of the failure of the Westinghouse type NBFD665 relay could not be determined. Repeated bench testing of the relay could not duplicate the failure condition. The relay operated successfully in all tests.

,