ML19320A803

Final Deficiency Rept Re Defects in Diesel Generator Control Panels Mfg by Intl Control & Switchgear Co.Equipment Being Repaired by Morrison-Knudsen.QA Activity Will Be Increased. Applicability of 10CFR21 Under Evaluation

ML19320A803
Person / Time
Site:	Grand Gulf
Issue date:	06/25/1980
From:	MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML19320A801	List: ML19320A800 ML19320A803
References
NUDOCS 8007020632
Download: ML19320A803 (1)

Text

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l Attachm:nt A to AECM-80/142 Page 1 of 1 FINAL REPORT, PRD-80/21 i .

, I. Description of Deficiency Power Systems Division of Morrison-Knudsen Company notified the NRC of deficiencies pertaining to diesel generator control panels which were considered reportable under 10CFR21. The generator control panels were manufactured by the International Control & Switchgear Company in Rocky Mount, North Carolina.

Morrison-Knudsen made an on-site inspection of the diesel gen-erator control panels on May 5 and 6, 1980. Of the defects reported to the NRC, the following defects were identified at Grand Gulf.

Defect #2 - There were instances in which 600 volt lugs were used on 4160 and 6900 volt cables. This could contribute to a degradation after a long period of time due to possible corona damage.

Defect #3 - There were AC rated fuses found in DC circuits.

An AC fuse may not adequately clear a DC fault due to the shorter gap in the AC fuse.

II. Safety Implications If these defects sere to have remained uncorrected, they could have affected adversely the safety of operation of the plant at any time throughout the expected lifetime of the plant.

The diesel generators are the emergency power source for the High Pressure Core Spray (EPCS) system.

III. Corrective Action Taken The equipment is being repaired per FDDR #JB1-940 under the supervision of Morrison-Knudsen. The action taken to preclude recurrence is (1) Morrison-Knudsen is increasing its QA activity and has since revised its entire QC/QA program and (2) General Electric is increasing its QA activities regarding surveillance of Morrison-Knudsen efforts.

Details of the corrective actions are delineated in Management Corrective Action Report, MCAR-GGNS No. 75.

8007020 f'i3