ML20154N350

Submits Rev to Response to GL 97-04, Assurance of Sufficient Net Positive Suction Head for ECC & Containment Heat Removal Pumps

ML20154N350
Person / Time
Site:	Farley
Issue date:	10/15/1998
From:	Dennis Morey SOUTHERN NUCLEAR OPERATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-97-04, GL-97-4, NUDOCS 9810210259
Download: ML20154N350 (1)

Text

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'. Dave Morey (

Southern Nuclear

- Vice President

~ OptratiIg Compa:y -

farley Project :

. P0. Box 1295 Birmingham. Alabama 35201'

-l Tel 205.992.5131 i

I October 15, 1998 SOUTHERN COMPANY Energy to Serve YourWorld" Docket Nos.: 50-348' 10 CFR 50.54 50-364 U.S; Nuclear Regulatory Commission ATTN: Document Control Desk -

' Washington, DC 20555 Joseph M. Farley Nuclear Plant Revision to Response to Generic Letter 97-04," Assurance of Sufficient Net Positive

' Euction Head For Emergency Core Cooling And Containment Heat Removal Pumos" Ladies and Gentlemen:

. NRC Generic Letter 97-04 requested addressees to provide information pertaining to the i

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ECCS and containment spray pump NPSH calculations for the recirculation mode. The 90-

. day actions were completed by Southern Nuclear Operating Company (SNC), and the requested information was transmitted by SNC letter dated December 30,1997,

- As a result of this information request, SNC identified needed changes and enhancements to i

the' existing calculations. By letter dated June 1,1998, SNC revised the December 30,1997,-

SNC response to Generic Letter 97-04 to denote the changes to the existing calculations.

Subsequent to the June 1,'1998 submittal, SNC was informed of an error by the vendor in

. performance test data for the spare charging pump. This error has resulted in a change to the required NPSH for the charging pump as documented in the June 1,1998 submittal. The performance testing of the' spare charging pump with the corrected data establishes a required NPSH'of 94 feet at 712 gpm versus the required NPSH of 50 feet at 710 gpm previously

reported. Adequate margin still exists for the charging pumps as the available NPSH was L

j determined to be 166 feet at a flow of 708 gpm.

t Respectfully submitted,

\\ O f} 771ou Dave Morey l

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cc: Mr. L. A. Reyes, Region II Administrator Mr. J. I. Zimmerman, NRR Project Manager Mr. T. P. Johnson, FNP Plant Sr. Resident Inspector F ~ ~

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