ML19319B926

Interim Deficiency Rept Re Cyberex 125 Volt Dc Battery Charger Operational Status at Facility.Program to Correct Deficiencies Being Established.Final Rept Will Be Submitted Upon Completion of Study

ML19319B926
Person / Time
Site:	Davis Besse
Issue date:	06/06/1975
From:	Roe L TOLEDO EDISON CO.
To:
References
NUDOCS 8001290662
Download: ML19319B926 (2)

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, June 6, 1975 Facehtees Development mai nss-s24a Docket No. 50-346 Dr. Donald F. Knuth, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. Knuth:

t This lettar is submitted as an Interim Report regarding the Davis-Besse

. Nuclear Fover Station Unit No. 1 Cyberex 125 volt D.C. Battery Charger problems related by telecon to Mr. J. W. Sutton, Office of Inspection and Enforcement, Region III on May 8, 1975.

A joint meeting was held at the Cyberex factory between Cyberex, Bechtel Company, our Architect Engineer and Toledo Edison Company to clarify certain n conditions affecting the operational status of the Cyberex 125 volt, 600 amp,

( I D. C. Bartery Chargers beirs installed at the Davic-Ecccc "ucicar I'cwer

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Station Unit No. 1. Additional testing was done by factory personnel at Cyberex and at the plant site.

As a result of these meetings and manufacturer performed tests, the following problems were delineated, and Cyberex is presently establishing a corrective program for the following deficiencies:

1)

Battery Charger output voltage unstable over load range of charger.

2) Excessive deenergized battery charger loading of D.C. bus.

The foregoing items are currently under review by the Applicant, and the vendor.

Upon completion of the establishment corrective action and verification of its results, a definitive report of the deficiency, analysis of the safety impli-cations ani! the corrective action taken will be submitted to your office in accord with 10CFR Part 50.55 (e).

Yours very truly, cc: J. G. Keppler, Regional Director A Office of Inspection and Enforcement Region III

{Q THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652