ML19254F245

Final Deficiency Rept Re Emergency Diesel Generator 2H Cylinder Exhaust Temps Which Exceeded Max Temp of 1,100 F During 24-h Test.Caused by Insulation Matl in Air Intake Sys.Matl Removed & Units Tested Satisfactorily

ML19254F245
Person / Time
Site:	North Anna
Issue date:	10/17/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
843, NUDOCS 7911070420
Download: ML19254F245 (3)

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23261 ro,0 ,. W?INI z A ELECTRIC AND POWER COMP ANY. RICHMQMD, VIRGINI A

[ T lg October 17, 1979 Mr. dJnes P. O'Reilly, Director Serial No. 843 Office of Inspection & Enforcement PSE&C/SCJ

mac: wang U. S. Nuclear Regulatory Commission Region II Docket No. 50-339 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

On October 12, 1979, a rrsort was made under the provisions of 10CFR50.55(e) concerning the Emergency Diesel Generator.

In accordance with the reporting requirements of 10CFR21, the following infonnation is submitted:

A. Name and address of reporting individual:

Mr. E. A. Baum, Executive Manager Licensing and Quality Assurance Virginia Electric and Power Company P. O. Box 26666 Richnond, Virginia 23261 B. Facility, activity and/or component affected:

North Anna Power Station, Unit 2 Emergency Diesel Generator C. Name of firm constructing the facility or supplying the component, activity or service:

Fairbanks Morse, Inc.

Power System Division - Colt Industries 701 Lawton Avenue Belofo, Wisconsin 53511 1 ') r3 p j g gi Y9

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D. Description of defect, deficiency, or failure to comply:

On August 30-31, 1979, approximately 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> into the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> test run on the 2H Emergency Diesel Generator, the cylinder exhaust temperatures (cylinders #5, #7, #8, #10, & fil) exceeded the maximum temperature of 11000F. The diesel was immediately unloaded and later shut down.

Upon inspection of the diesel, insulation material was found packed in the turbocharger fan blades and then was later found on top of the inner cooler coils. The Fairbanks Morse representative indicated that the insulation materia'. was not part of the diesel combustion air intake system. Had the insulation in the turbocharger and inner cooler gone undetec6ed, the potential would have existed for the Emergency Diesel Generator to be incapable of performing its intended safety function during an accident condition.

E. Date of determination of reportability:

October 12, 1979 F. Similar components, activities, or services:

North Anna Unit 1 G. Corrective action which has been, is be g or will be taken, the ind vidual responsible and the length or time to complete the action:

All insulation material was removed from Unit 2H. Unit 2J was inspected and found to be free of any insulation material. On October 13, 1979, both Emergency Diesel Generator Units 2H & 2J were satisfactorily tested for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. On October 14, 1979, the factory representative reviewed the diesel logs and inspected the diesels.

The factory representative was satisfied with the performance of Emergency Diesel Generator Units 2H & 2J. Vepco concurs with the factory representative's assessment and therefore considers this problem resolved.

H. Other information:

Since no other actions will be required to correct the problem described in section D of this report, we consider this to be the final report ander the provisions of 10CFR50.55(e).

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• Should you requirt further information, please contact this office.

Ve y trul yours, llf "Vit Sam C. Br

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Senior Vice Presi'ent - Power Station Engineering and Construction ec: Director, Office of Inspection and Enforcement (3) l'"2 196 O