ML19261A582

Final Deficiency Rept Re Class 1E Station Battery.Corrected by Release of Approved Design Change Adding Isolation Bars to Battery Racks.Specific Process Correction Unnecessary. Seismic Qualification Testing to Be Completed by Jan 1980

ML19261A582
Person / Time
Site:	Midland
Issue date:	01/31/1979
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
HOWE-37-79, NUDOCS 7902050074
Download: ML19261A582 (2)

Text

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' k\ $$(h, $rU U Stephen H. Howell Senior Vice President

.m M Geners' Of fices: 1945 West Pernall Road, Jackson, Michigan 49201 . (517) 788 4453 January 31, 1979 Hove-37-79 Mr J G Keppler, Regional Director Office of Inspection and Enforcement Recion III U3 Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAID NUCLEAR PLAITI UNIT NO 1, DOCKET NO 50-329 UNIT NO 2, D0clar NO 50-330 CLASS lE ST/, TION BA7fERY

Reference:

1) Letter, S H Howell to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Class IE Station Battery; Howe-235-78;. dated November 17, 1978

2) Letter, S H Howell to J G Keppler; Midland Nuclear Plant; Unit No 1, Docket No 50-329; Unit No 2, Docket No 50-330; Class lE Station Battery, Hove-3-79; dated January 5, 1979 The referenced letters were interim 50 55(e) reports which described the nonconformance and the proposed part corrective action.

4 This letter is the final report. The reportable design deficiency has been corrected, as proposed, by the release of an approved design change which adds isolation bars to the battery racks. The design is now in conformance to requirements.

Specific process corrective action is unnecessary since the anomaly was identified by the vendor's existing program and there is no reason to suspect deficiencies in their design process. The battery racks were originally tested by Wyle Laboratory for use in four and five foot segments. Computer analysis revealed the inadequacy of the design for segments of greater length.

Aside from the above, the seismic qualification testing of Exide's prototype G cell and battery rack assembly is expected to be completed by January, 1960.

Inntallation of the battery racks to the new des 16 n can ecmcence in early March, 1979

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(y CC: Mr John G Davis, Acting Director LDirector, Office of ManaCecant Office of Inspection & Enforcement, U3NRC (15) Information and Program Control, USNHC (1) h 9

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