ML20003B678

Interim Deficiency Rept Re Motor Terminal Block Voltage Ratings in Limitorque Valve Controls,Initially Reported on 810121.Blocks Will Be Replaced by Bolted lug-to-lug Taped Termination.Final Rept Will Be Sent by 810715

ML20003B678
Person / Time
Site:	LaSalle
Issue date:	02/20/1981
From:	Delgeorge L COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 81-01, NUDOCS 8102250163
Download: ML20003B678 (2)

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. A3Jfk'[rt: 'f ,[ t %M Ot C0 dC-( Id7 cr.:cm, m.nois Q,630 February 20, 1961 Mr. James G. Xeopler, Director Directorate of Inspection anc Enforcement - Regica III U.S. Nuclear Regulatcry Commission 799 Rcosevelt Roao Glen Ellyn, IL 60137 Suoject: LaSalle County Station Units 1 and 2 Motor Terminal Slock Voltage Ratings in

, Limitorcue Valve Controls 10 CFR 50.55(e) 30 Day Report LSCS 50.55(e) #SI-01 NRC Occket Nos. 50-373/374

Dear Mr. Keppler:

1. On January 21, 1981, Cocoonaealth Ecison notifisc your office that two olfferent types of terminal biccks (TS), both rated at 300 volts, were found in the 480 volt power circuits of Limitorque Valve Controls. That notification was made in accordance '

with 10 CFR 50.55(e). This letter fulfills tne 30-day reporting requirement of tnat . regulation.

Commonwealtn' Edison Stancards C-2325 ano EM-19622 require

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-these TB's to be rateo at 600 volts in this apolication. Tne two types were icentifiec as'the Marathon 300 series anc a auchannen medium cuty " phenolic". . hao these terminal biccxs remainec in service, it.'is pocsicle tnat the valves affecteo coulc nave malfunctioneo oue to arcing on the terminal blocks. .

La'alle County Station Project Constructicn issuea Nonconform; ;e Report 1488 with a recommencation tnat the 78's in the 480 volt pcwar circuit ce-replacen witn a colted '.ag tc lug taped termination. Ccmmonwealth Ecison Project' Engineering is in agreement witn this recommencation.

Project Construction'will initiate a two part insoection/ replacement program. .'ine first part will ccnsist of an jf inspection of Unit 1,anc Unit 2 Limitorque-Va'lve Cont cis oy the H. $

P. Foley Cuality control.00partment to identify.tne valves wnica have the 300~voit ratec TS's. The secona part will ce tne reasoval

'of tne1TS ano the installation of a . bolted lug to lug taped j ()

termination. This. termination will ce installed in accorcance witn 4- H. P. Foley work. Instruction-500, Terminations. In adcition, both P

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a Mr. J.aes G. x colar, Cirector Februar/ 10, 1931 Page 2 H. C. Foley and CECO. CAD nave ceen instructcc tnat any future a80 Voit power terminations in Limitorcue Vaive Contrais ce coiteo lug to Aug tdcea terninations.

Tne inspections ano installations are seneouled to take place as folicas:

Part 1: The inspect 2cn of thc Limitorque valve controls by H. P. Foley:

Unit 1 - Complete by May 1, 1981 Unit 2 - Complete oy June 1, 1981 Part 2: Tne inst 911ation o f the colted lug to lug taped terminations:

Unit 1 - Complete by June 1, 1981 (prior to fuel load)

Unit 2 - Complete oy July 1, 1931 We anticipate submitting a final 10 CFR 50.55(e) report by July 15, 1981.

Please address any questions you may have 'in this regard to this office.

Very truly yours,

, c. 4] syc/m W

/

L. O. DelCeorge Nuclear Licensing Acministrator cc: Director of Inspection ano Enforcement ' ' .

Wasningtcn, CC RIII Inspector - LaSalle 07238