ML19208C441

Deficiency Rept Re Emergency Diesel Generator Fan Cooling Sys Which Appears to Be Inadequately Designed.Alternatives Presented at 790911-12 Meeting of S&W,Vepco & Colt Industries Currently Being Evaluated to Determine Solution

ML19208C441
Person / Time
Site:	North Anna
Issue date:	09/14/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
747, NUDOCS 7909260434
Download: ML19208C441 (2)

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9 VIRGINI A ELECTRIC AND POWER COMP ANY, RICt:*.4CND, VIRGl*fl A 23261

'9 EiP I7 alg: g g September 14, 1979 Mr. James P. O'Reilly, Director Serial No. 747 Office of Inspection & Enforcement PSE&C/SCJ:mac: wang U. S. Nuclear Regulatory Conrnission Region II Docket No. 50-339 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

On September 10, 1979, a report was made under the provisions of 10CFR50.55(e) concerning the Emergency Diesel Generator Fan Cooling System.

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 Richmond, 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 s 701 Lawton Avenue Beloit, Wisconsin 53511 1012 356 D. Description of defect, deficiency, or failure to comply:

The Emergency Diesel Generator Fan Cooling System for North Anna Unit 2 appears to be inadequately designed. For any given fan blade pitch setting there is an associated ambient temperature range through which the Fan Cooling System can satisfactorily operate. Analysis of local meteorological data indicates that ambient temperature ranges exist which exceed the capability of the current Fan Cooling System.

For instance, if the fan blade is pitched for adequate cooling at high ambient temperatures and low ambient temperatures occur, the fan drive system could be overloaded. Similar11y, if the system is pitched for low ambient tem eratures and hi h ambient temperatures occur, the Diesel Engine wi 1 be inadequate y cooled. gf sjw!_L COPY 79092606 % 1 5

r E. Date of determination of reportability:

September 10, 1979 F. Similar components, activities, or services:

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

A meeting held September 11 & 12 between Colt Industries, Stone &

Webster, and Vepco representatives determined that various technical alternatives are available to solve the problem identified in Section D. These alternatives are currently being evaluated to determine the most feasible solution.

H. Other infomation:

None Any information not availOle at this time will be submitted in a follow-up letter as a 30-day report.

Should you require further information, please contact this office.

Very truly yours,

$ d M. A m 4 ,-

P Sam C. Brown, Jr.

Senior Vice President - Power Station Engineering and Construction cc: Director, Office of Inspection andEnforcement(3) i

, 10.12 357

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