ML20247Q199

Responds to NRC Bulletin 88-004, Potential Safety-Related Pump Loss. Routine Maint,Insp & Surveillance Practices Will Be Continued to Detect Pump Degradation & to Prevent Future Concerns W/Turbine Driven Auxiliary Feedwater Pumps

ML20247Q199
Person / Time
Site:	Farley
Issue date:	09/21/1989
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-004, IEB-88-4, NUDOCS 8909280132
Download: ML20247Q199 (2)

Text

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Alabima Power Company I

40 inverness C:nter Parkway Post Office Box 1295

)-

Birmingham, Alabama 35201 L

Telephone 205 868-5581 W. G. Hairston, til Senior Vice President Nuclear Operations Alabama Power the Southern UectnC Syclem September 21, 1989 Docket Nos. 50-348 50-364 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Vashington, D.C.

20555 Gentlemen:

Joseph H. Farley Nuclear Plant Miniflow Evaluation - NRC Bulletin 88-04 NRC Bulletin No. 88-04, " Potential Safety Related Pump Loss," requires Alabama Power Company to investigate and correct, if applicable, two miniflow design concerns. The Bulletin requires that each safety-related system be evaluated for pump-to-pump interaction during miniflow operation and be evaluated for adequacy of the minimum flow bypass for safety-related centrifugal pumps with respect to damage resulting from operation and testing.

By letter dated November 30, 1988, as later modified by letter dated March 23, 1989, Alabama Power Company provided evaluations for all safety-related pumps except the auxiliary feedvater pumps. The auxiliary feedvater pump evaluation is attached. As a result of the evaluations performed for miniflow concerns, Alabama Power Company did not identify any long-term resolution actions. Thus, this response completes the requirements of Bulletin 88-04 for Farley Nuclear Plant.

The information provided herein is true to the best of my knowledge and belief. If there are any questions, please advise.

Respectfully submitted, H i st n, III l'I VCH,III/ REM:r.d 9.39 SVORN TO AND SUBSCRIBED BEFORE H Attachment THIS CS/

DAY OF V IfA; 1989 cc:

Mr. S. D. Ebneter

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I Hr. E. A. Reeves f

Hr. G. F. Maxwell L[llfi l'

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Nntary Public My Commission Expires:

Ed. cN. /Nb 8909280132 390921 m

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System:

Auxiliary Feedvater (AFW)

Pumps:

2 motor driven AFV pumps per. unit 1 turbine driven AFV pump per unit Miniflow

Description:

A continuously open miniflov line

-l from each AFV pump discharges.into-a j

-common miniflow header.

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Pump-to-Pump Interaction:

Pump-to-pump interaction is precluded i

by the use of a high resistance j

minimum flow orifice and check valve in'the miniflow line from each AFV l

pump. The miniflow orifice was i

supplied by the pump vendor and j

installed following the vendor's technical manual.

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Adequacy of Miniflow: The system designer, in conjunction with the pump vendor, has determined that the minimum flow for the motor driven AFV pumps is satisfactory,for all operations. For the turbine j

driven AFV pumps, the miniflow line l

is adequate for all modes of operation provided the duration of operation is minimized.

In order to prevent future concerns with the turbine driven AFV pump, a caution has been added to the operating procedures to limit minimum L

flow operation of the pump within an acceptable duration. Additionally, routine maintenance, inspection, and surveillance practices vill be i

continued to detect pump degradation.

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REM:md 9.39

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