ML19296B803

Deficiency Rept Re Circuit Separation Discrepancies.On 790323,improper Separation Noted W/Div 174 Wiring in Panel 2H13P692.Deficiencies Discovered on Panels 2H13P693 & 4.Wires Relocated & Redressed.Final Rept by 800515

ML19296B803
Person / Time
Site:	Grand Gulf
Issue date:	01/31/1980
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:
References
AECM-80-33, NUDOCS 8002210523
Download: ML19296B803 (2)

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-~m lF" MISSISSIPPI POWER & LIGHT COMPANY f

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') i Helping Build Mississippi P. O. B O X 16 4 0, J A C K S O N, MIS SI S S I P PI 3 9 2 0 5

..oouctio,.on ..vue e January 31, 1980 g Office of Inspection & Enforcement ,Q .fj U. S. Nuclear Regulatory Comission cd .7 .

Region II -e  !%

101 Marietta Street, N.W. , Suite 3100 NO Atlanta, Georgia 30303 D 6

ATTENTION: Mr. J. P. O' Reilly, Director i n.

SUBJECT:

Grand Gulf Nuclear Station File 0270/15525/15526 PRD-79/07, Status Report #4 J Inadequate Circuit Separation AECM-80/33 On March 23, 1979, Mississippi Power & Light Company notified Mr.

J. K. Rausch of your office of a potentially reportable deficiency at the Grand Gulf Nuclear Station construction site. The deficiency concerns circuit separation discrepancies found in Unit 1 and 2 Power Generation Control Complexes.

The deficiency, currently under investigation by the General Electric Company, initially concerned non-compliance with Regulatory Guide 1.75 and IEEE Standard 384 in that improper separation was noted with redundant class IE wiring Div.1 and Div. 4, terminating on comon device FK-483 in panel 2H13P692.

During the investigation the deficiency was noted also to exist on panels 2H13P693 and 2H13P694. Corrective actions, thus far, include wire redressing, conduit installation, and wire relocation. Fire tests have been conducted on relay FK-48B and its redundant counterparts to insure

, compliance with IEEE 384, specifically paragraph 5.6.2. Additional fire tests remain to be conducted. The preliminary evaluation indicates that safe operation would not have been adversely affected had this deficiency remained uncorrected.

Further investigation is required to evaluate the extent of this deficiency, required corrective actions, and safety implications. The detailed description of the work associated with this deficiency can be found in General Electric Design Record File (DRF) H13-79. -

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i 8002210 Member Middle South Utilities System OFFICIAL

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• i MISSISSIPPI POWER & LIGHT COMPANY Office of Inspection & Enforcement AECM-80/33 U. S. Nuclear Regulatory Comission Page 2 We expect to submit a determination of reportability and final report detailing the evaluation of this deficiency by May 15, 1980.

Yours truly, L. F. Dale Nuclear Project Manager JCC/JDR:bsh cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Victor Stello, Jr., Director Division of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 9

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