ML20236H037

Forwards Safety Evaluation Re Util Justification for Calculated motor-driven Auxiliary Feedwater Pump Operability.Justification Acceptable & Procedures Sufficient for Mode 3 W/O Any Decrease in Plant Safety

ML20236H037
Person / Time
Site:	Sequoyah
Issue date:	11/02/1987
From:	Zwolinski J NRC OFFICE OF SPECIAL PROJECTS
To:	White S TENNESSEE VALLEY AUTHORITY
Shared Package
ML20236H040	List: ML20236H037 ML20236H059
References
TAC-00060, TAC-00061, TAC-60, TAC-61, NUDOCS 8711030399
Download: ML20236H037 (3)

Text

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\._ . #psMouqf'o,, UNITED STATES 8 o NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 7; j '

l November 2, 1987 Docket Nos. 50-327 and 50-328 l

Mr. S. A. White Manager of Nuclear Power  ;

Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801

Dear Mr. White:

SUBJECT.: AUXILIARY FEE 0 WATER PUMP PRESSURE DROP REQUIREMENTS AND f OPERABILITY (TAC 00060,00061)

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Re: Sequoyah Nuclear Plant Units 1 and.2 Plant modifications were performed by the Tennes'see Valley Authority (TVA) to the auxiliary feedwater pump dischrge lines to replace the existing pressure control valves with cavitating venturis. These modifications changed the system resistance of the auxiliary feedwater flow' path and- thus raised a concern regarding the adequacy of the existing Technical Specification (TS) J surveillance requirement (differential pressure of greater than or equal to 1397 psid on recirculation flow) to demonstrate full flow capability.

By letters dated December 23, 1986, supplemented on June 25, 1987, and September 24, 1987, TVA submitted its proposal for demonstrating auxiliary feedwater system operability for Mode 3. This included plans to reestablish an appropriate surveillance requirement pressure drop based on calculations, to be confirmed by verification testing once in Mode 3, and subsequent submittal of a request for a TS change to incorporate a new surveillance requirement if any TS changes were warranted. -

The NRC staff has completed it evaluation of TVA's methodology, calculations .

and procedures for addressing auxiliary feedwater operability and concludes.  ;

that they are acceptable and would support entry into Mode 3 Within 60 days' j of completion of the verification testino in Mode 3, TVA is required to submit  ;

either the above-mentioned proposed TS change request or a letter documenting  :

the acceptability of the existing TS. Enclosed is the staff Safety Evaluation.

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1 Mr. S. A. White -2 November 2,1987

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If you should have any questions with regard to-the above, please contact Mr.

Thomas S.'Rotella, Project Manager;.at 301-492-9043.

Sincerely, John A. Zwolinski, Assistant Director for Projects .

~TVA Projects Division-Office of Special Projects

Enclosure:

Safety Evaluation cc w/ enclosure:

See next page Distribution Docket.' E1)e yy

. C. Jamerson NRC PDR T. S. Rotella local PDR OGC-Bethesda Projects Reading F. Miraglia J. Keppler/J. Axelrad E. Jordan S. Ebneter J. Partlow S. Richardson ACRS(10)

J. Zwolinski TVA-Bethesda B. D. Liaw SON File G. Zech JRutberg J. Clifford E. McKenna J. Kelly f

OSP:TVA/LAh OSP:TVA , b }P OSP:AD/P TRote11 s BDLiaw .JZwolinski CJamerson@ m/ 36 7 6 /go/87 y/t/87.

\o/30/87

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Mr. S. A. White Sequoyah Nuclear Plant Tennessee Valley Authority CC:

General Counsel Regional Administrator, Region 11 Tennessee Valley Authority U.S. Nuclear Regulatory Commission )

101 Marietta Street, N.W.

400 West Summit Hill Drive Atlanta, Georgia 30323 1 E11 B33 j Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NP Mr. R. L. Gridley c/o U.S. Nuclear Regulatory Commission {

J Tennessee Valley Authority 2600 Igou Ferry Road SN 1578 Lookout Place Soddy Daisy, Tennessee 37379 Chattanooga, Tennessee 37402-2801 l

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Mr. Richard King Mr. H. L. Abercrombie c/o U.S. GA0 Tennessee Valley Authority 1111 North Shore Drive Sequoyah Nuclear Plant Suite 225, Box 194  :

P.O. Box 2000 Knoxville, Tennessee 37919 j Soddy Daisy, Tennessee 37379 Tennessee Department of Mr. M. R. Harding Public Health 3 Tennessee Valley Authority ATTN: Director, Bureau of I Sequoyah Nuclear Plant Environmental Health Services l P.O. Box 2000 Cordell Hull Buildir,g Soddy Daisy, Tennessee 37379 Nashville, Tennessee 37219 l Mr. D. L. Williams Mr. Michael H. Mobley, Director Tennessee Valley Authority Division of Radiological Health 400 West Summit Hill Drive T.E.R.R.A. Building W10 B85 150 9th Avenue North Knoxville, Tennessee 37902 Nashville, Tennessee 37203 County Judge Dr. Henry Myers, Science Advisor j Hamilton County Courthouse Committee on Interior l' Chattanooga, Tennessee 37402 and Insular Affairs U.S. House of Representatives Washington, D.C. 20515 I

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