ML20083Q811

AO 73-11-17:on 731117,during Maint Work,Facility Experienced Loss of Offsite Power.Caused by Electrician Bumping 50FDS/SI Seal in Relay.Electricians Cautioned

ML20083Q811
Person / Time
Site:	Nine Mile Point
Issue date:	11/28/1973
From:	Perkins T NIAGARA MOHAWK POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20083Q808	List: ML20083Q806 ML20083Q811
References
AO-73-11-17, NUDOCS 8303140626
Download: ML20083Q811 (2)

Text

liR. JA"ES P. O'REILLY - USAEC - KIllG OF PRVSSIA, PATRO? q TO:

hTION SUPERIliTEllDE!!T - NINE MI( OINT F1

, FRGI: ,T. J. PERKI!iS AP.Nd'S%L OCCURRLiiCE # 73-11-17 L e

LO55 0F 0FF SITE P0'.!ER  ;

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i.J9W!T TO TECilNICAL SPECIFICATIONS 1.13 d M!D 3.6.3, UE ARE REP 03.TII G A" AB!iciC%L

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OCCUP. PENCE L'i!IC!! UAS TELEPHONED TO YOUR OFFICE ON 11/10/73 AT AP ,

ON i;0VE!3ER 17,10,3 7 AT 1626 ilRS., HIllE ItILE POI!!T liUCLEAR STATI0!l, UNIT fl EXPERIEf;CED A LO3S OF ALL OFF SITE POUER.

FOLLC?.'IliG OPEMTOR CRITICAL DERONSTPATIO'lS, THE REACTOR UAS II: THE JUST CRITICAL CONDITION, l'.0DE SUITCH Ill START-UP, l'0DEPATOR TEllPERATURE 207 F, HIill 0:iE 115 KV Ill Tile COURSE OF Tl!E RESERVE LIllE DE-Li'ERGIZED TO CONNECT THE 115 KV LINE TO JAFilPP.

RELINUORK ASSOCIATED HITil TilIS CONNECTIO!!, A PLNiT ELECTRICIAH BUMPED 50 FDS/SI, A SEAL Ili RELAY, URICil TRIPPED NID DE-ENERGIEED RELAY 9C CAUSIllG Tile LOSS OF THE REl%IllIN LINE.

A REACTOR SCRIJt OCCURRED 5.4 SECONDSILATER AS !!3 SETS (l131 A!!D #141 .

POWER 1:ERE C0fsSTIllG DOWN MlD TRIPPED AT 5511Z. MITHIll 9 SECONDS FRO'1 Till L ALL A.C., TiiE TUO DIESEL GENERATOR SYSTEMS HERE:VP NtD HAD EllER0IZED Tile Tl:0 CONTROL l

R0D DRIVE PU".FS TO IMlliTAlli LEVEL. REACTOR UATER LEVEL llEVER DECREASED MlD WAS 1%III-TAINED WITHIll Tile NOR",AL EXPECTED RAllGE FOR THIS TRA!!SIENT. ALL SYSTE!!S FUNCT10!iED AS DESIG:!ED UITH A LOSS OF 115 KV llITHOUT TiiE TURBINE-GENERATOR UNIT AVAILABLE.

Ti!E 115 KV LIl!E UAS AUTO?AiICALLY RESTORED TO SERVICE IH APPROXIl%TELY 10 THE REACTOR UAS RESTARTED AT APPROXIl%TELY 9 PM AFTER RESTORATI0li 0F BOTil 11 NiD 1102 %L CD:iDITIONS dSTABLISHED UITHIll Tile PLklT.

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Form AlC-H t Ro, Mn 16,19m AEOf 02 40 Note and return. For slenature. X For informa tion.

70 (Name and unst) thiTIALS Rf.M AR KS RO Chief, FSSEB NIAGARA MOHAWK RO:HQ (5)

RO Files oATE NINE MILE POINT NUCLEAR POWER STATION Central Mail & Files Regulatory Standards (3) DN 50-220 A0 73-11-17 TO (Name sad unst) INITIALS REMARK 5 Directorate of The above abnormal occurrence is forwarded Licensing (13)

Regional Directors, cATE for information. Distribution will be made (R0 11, III, IV)

OGC by this office to the PDR, Local PDR, NSIC, TO (Name and unit) wet 4ALS REMARKS DTIE, and State Representatives.

CATE F ROtf ame and unst) REMARKS

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.' J. Brunner Region I .

PHONE 9006 DATE ,

8-337-1246 11/28/73 USE OTHER $1DE FOR ADDITIONAL REMARKS h CPO t 19710 - 445 443

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