ML19254E207

Third Interim Deficiency Rept Re Circuit Separation Discrepancies in Power Generation Control Complexes.Will Make Determination on Reportability by 800131

ML19254E207
Person / Time
Site:	Grand Gulf
Issue date:	10/22/1979
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:
References
NUDOCS 7910310320
Download: ML19254E207 (1)

Text

, f MISSISSIPPI POWER & LIGHT COMPANY i s Helping Build Mississi pi P. O. B O X 16 4 0, J A C K S O N, Ml3SISSIPPI 39205 PRODUCTtON DtP&RTWENT Office of Inspection & Enforcemet.t October 22, 1979 U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 ATTENTION: Mr. J. P. O'Reilly, Director Gentlemen:

SUBJECT:

Grand ;u'f Nuclear Station File 02/0/15525/15526 Interim Report No. 3 for PRD-79/07 As Defined in 10 CFR 50.55(e)

AECM-79/117 On March 23, 1979, Mississippi Power & Light Company notified Mr. J. K. Rausch of your office of a potential reportable deficiency at the Grand Gulf Nuclear Station Construction site. The deficiency concerns circuit separation discrepancies found in the Unit 1 and Unit 2 Power Generation Control Complexes.

The problem specifically concerns redundant class IE wiring, Division 1 and Division 4, terminating on a common device FK-48B in panel 2H13692.

This design represents inadequate implementation of circuit separation as required by Regulatory Guide 1.75 entitled " Physical Independence of Electrical Systems."

General Electric is currently inspecting the subject paneJs for wir-ing discrepancies.

We expect to receive the inspection results from G. E. and make a determination on reportability by January 31, 1980.

Yours truly, f, W JRF/JDR:pa L. F. Dale Nuclear Project Manager cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Jr. , Director Division of Inspection & Enforcement b U. S. Nuclear Regulatory Comission D' Washington, D. C. 20555 ~5 025 Q O Member Middle South Utilities System h