ML20079H969

Interim Part 21 & Deficiency Rept U-65 Re Mechanical Interlock on Ite Gould Motor Control Ctr two-speed Starters for Containment Cooling Fan Motors.Initially Reported on 831123.Final Rept Expected in 90 Days

ML20079H969
Person / Time
Site:	Callaway
Issue date:	01/06/1984
From:	Schnell D UNION ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-84-257-000 PT21-84-257, PT21-84-257-000, U-65, ULNRC-716, NUDOCS 8401240152
Download: ML20079H969 (1)

Text

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UNION ELECTRIC COM PANY 1908 GMATIOT STREET ST. Louis, MISSOU RI coNato r, ecNNatt "Yo" .^on ,"[.* *'

v.c......, January 6, 1984 .r. tou .. ui..ou m .. . ..

Mr. James G. Keppler Regional Administrator U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ell.yn, IL 60137 ULNRC- 716

Dear Mr. Keppler:

INTERIM 10CFR50.55 (e)/21 REPORT NO. U-C5 CALLAWAY PLANT UNIT 1 __

On November 23, 1983, Union Electric reported a 10CFR 50.55(e)/21 deficiency to Paul Pelke, NRC Region III. The deficiency involves the failure of a mechanical interlock on ITE Gould Motor Control Center two-speed starters for Contain-ment Cooling Fan Motors.

The failure involves the sticking and unreliable operation of the mechanical interlock between the 42T and 42S contactors in all four fan motor starters. This condition could prevent the fans from transferring from high speed (normal condition) to low speed (LOCA condition).

Union Electric has requested Bechtel to provide infor-mation on the failure and to determine if a generic problem exists with the mechanical interlock. ITE Gould will be con-tacted to provide information pertinent to the failure. A final report on this issue is expected to be submitted within 90 days of the date of this letter.

Very truly yours, P

Donald F. Schnell MAC/bjp cc: J. E. Konklin, NRC Region III Richard DeYoung, Director I&E NRC Resident Inspectors, Callaway Plant (2)

Missouri Public Service Commission B401240152 840106 ff//-

gDRADOCK 05000483 'I PDR

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