ML19260D615

LER 80-002/03L-0:on 800107,during Surveillance Test of Diesel Generator D-1,relay Misoperation Occurred Which Would Have Prevented Automatic Synchronization of Generator Onto Bus 15.Caused by Stuck Relay Plunger.Plunger Freed

ML19260D615
Person / Time
Site:	Prairie Island
Issue date:	02/06/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19260D605	List: ML19260D604 ML19260D615
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002110507
Download: ML19260D615 (1)

Text

NRC FORM 366 U. 5. NUCLEAR REGUL ATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK- l 1

l l l l l lQ 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI lo Iil8lM

1. 9 l NLICENSE l P El CODE Il Nll l@l 0 l 0l -l 0 l 0LKENSE 14 15 l 0 H 0 l- l 0 l 0 l@l 464 1LICE l 0 NvVME /$

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NSE TYP( JJ 57 LAT $$

COYT 10lil NE l L l@l 0l Sl0 l010 l 218 l 2 @l OEVENT l 110 71810l@l0l2lOl6l810l@

bu 6' DOCK ET NVV8E R 68 6'l DATE 74 75 REPOR T DATE H3 EVENT DESCRIPTION AND PROH ABLE CONSEQUENCES h o 2 lDurinn surveillance test of D1 Diesel Generator, a relay misoperation occurred l 10131 t which would have prevented automatic synchronization of the generator onto Bus 15. l o 4 1 Manual synchronization was available. Redundant power supplies were all operable. l l

0 5 Not recetitive. No effect on nublic health and safety.

l_O 16 l l 1 e i l l 0 H 7 8 9 HQ SYSTEM CAUSE C AUS E CO9P CODE VALVE CODE SU8 CODE CCVPO*.E NT CODE SUBCODE SUBCODE 7

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lE lB lh dh Wh lR lE lI,l Al Yl Xlh Wh Uh 9 to 11 12 13 18 19 10 SEOVENTI AL OCCU A RE NCE REPORT REVISION LE EVENT YE AR REPORT NO. CODE TYPE NO.

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AMEN A T ON ON PL AN T T4 HOURS S 8 li D FOR US SUPPLIE MAN FACTLRER W@LtJ@

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40 42 43 41 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l Relav plunger stuck. Plunger was freed and tested satisfactorily several times. l t i l Search is beina made for a more reliable replacement relay, l i 121 l I i 3 1 I i 4 I i 1 8 9 80 STh S  % POWER OTHER ST ATUS ISCOV RY DISCOVERY DESCRIPTION I i I s" I Lr.J@ l i I o I o 181 m I Laj@l m,rvem - rest I A! Tivi TY colTE NT red ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE NA NA Ii Ic Hi 1LzJ @ LzJ@l 1 10 11 44 l l 45 80 PERSONNEL E XPOSVRES NUVRE R TYPE DE SCRIPTION -

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'2 o a0 NUveER DESCn: PriONe . 194J l65 li la 8l l9 ol 01 Ol@L 1 11 12 NA l R0 L OSS OF OR DAM AGE TO FACILITY TYPE DESCRtPTION NA l 1 8 9 10

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NAME OF PREPARER A A Hunstad pggyg 61F W W M g 8002110 50%