ML20148D442

Submits Request for Addl Info Re Core Spray Weld Flaw Evaluation

ML20148D442
Person / Time
Site:	Browns Ferry
Issue date:	05/28/1997
From:	Williams J NRC (Affiliation Not Assigned)
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
TAC-M98059, NUDOCS 9705300206
Download: ML20148D442 (4)

Text

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p-E UNITED STATES NUCLEAR RES.ULATORY COMMISSION -

h g WASHINGTON. D.C. 20666 4001 l

%, . . . . . p' May 28, 1997 Mr. Oliver D. Kingsley, Jr.

President, TVA Nuclear and Chief Nuclear Officer Tennessee Valley Authority 6A Lookout Place 1101 Market Street Chattanooga, TN 37402-2801

SUBJECT:

BROWNS FERRY NUCLEAR PLANT UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION REGARDING CORE SPRAY WELD FLAW EVALUATION (TAC NO. M98059)

Dear Mr. Kingsley:

On March 7, 1997, the Tennessee Valley Authority (TVA) submitted a description of flaws identified during an inspection of core spray piping within the reactor vessel at the Browns Ferry Nuclear Plant (BFN) Unit 3. TVA's submittal included an evaluation of the effect of those flaws on the structural integrity of the core spray piping. Supplemental information was provided by TVA in letters dated March 9 and March 10, 1997. On March 11, 1997, the NRC staff indicated that no technical issues had been identified that would prevent restart of BFN Unit 3 from its refueling outage.

The staff indicated in its letter of March 11, 1997 that it would complete a detailed evaluation of the information provided by TVA after BFN Unit 3 restart. As part of this effort, the staff has identified a concern regarding the structural integrity of weld P9 since it has not been inspected, has been ground and, at least to some extent, is creviced. To address this concern, the staff will require additional information to complete its safety evaluation. The information required is as follows:

1. Provide a plant-specific system assessment assuming complete failure of weld P9 considering that the structural integrity of weld P8 is not assured.

2. Discuss the implications from risk perspective, including effect on core melt frequency, if weld P9 is assumed to fail considering that the structural integrity of weld P8 is not assured.

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9705300206 970528 PDR ADOCK 05000296 i P PDR l

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Mr. O. D. Kingsley Your prompt response will assist the staff in resolving this concern and documenting its findings in a safety evaluation in a timely manner.

Therefore, we request you provide your response within 14 days of receipt of this letter.

Please contact me at (301)415-1470 if you have any questions on this topic. ,

Sincerely, i Joseph F. Williams, Project Manager l Project Directorate 11-3 i Division of Reactor Projects - I/II  !

Office of Nuclear Reactor Regulation ,

I Docket No. 50-296 cc: See next page I

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Mr. 0! D. Kingsley - 7. -

Your prompt response will assist the ',taff in resolving this concern and documenting its findings in a safety evaluation in a timely manner.

Therefore, we request you provide your response within 14 days of receipt of this letter.

Please contact me at (301)415-1470 if you have any questions on this topic.

Sincerely, JoNh0YW!lffamsfY Pf6%WMnager Project Directorate II-3 i Division of Reactor Projects - I/II l Office of Nuclear Reactor Regulation Docket No. 50-296 cc: See next page i l

Distribution Docket File- PUBLIC BFN Rdg. Reading SVarga 0GC ACRS JJohnson, RII DOCUMENT NAME G:\BFN\M98059.RAI To receive a copy of this document, indicate in the box: "C" - Copy without attachment / enclosure "E" - Copy with attachment / enclosure "N" - No copy Off!CE PDII 3/PM g, lcI PDII-3/LA ,,y l l PDII-3/D , ) l CL l l NAME JWilliams [M BClayton (# FHebdon 't1 DATE 05/2f/97 // 05/g W 97 05/,7.7/97 OFflCIAL RECORD COPY l

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be Sr. 01'iver C. Kingsley, Jr. BR0'4NS FERRY NUCLEAR PLANT Tennessee Valley Authority cc: i Mr. O. J. Zeringue, Sr. Vice President Mr. Timothy E. Abney, Manager Nuclear Operations Licensing and Industry Affairs Tennessee Valley Authority Browns Ferry Nuclear Plant 6A Lookout Place Tennessee Valley Authority '

1101 Market Street P.O. Box 2000 Chattanooga, TN 37402-2801 Decatur, AL 35609 Mr. Jack A. Bailey, Vice President Regional Administrator 1 Engineering & Technical Services U.S. Nuclear Regulatory Commission  ;

Tennessee Valley Authority Region 11 '

6A Lookout Place 61 Forsyth Street, SW., Suite 23T85 ,

1101 Market Street Atlanta, GA 30303-3415 '

Chattanooga, TN 37402-2801 Mr. Leonard D. Wert Mr. C. M. Crane, Site Vice President Senior Resident Inspector Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant <

Tennessee Valley Authority U.S. Nuclear Regulatory Commission )

P.O. Box 2000 10833 Shaw Road  !

Decatur, AL 35609 Athens, AL 35611 i General Counsel Chairman Tennessee Valley Authority Limestone County Commission ET 10H 310 West Washington Street 400 West Summit Hill Drive Athens, AL 35611 Knuville, TN 37902 State Health Officer Mr. Raul R. Baron, General Manager Alabama Department of Public Health Nuclear Assurance and Licensing 434 Monroe Street Tennessee Valley Authority Montgomery, AL 36130-1701 4J Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Masoud Bajestani, Plant Manager Browns Ferry Nuclear Plant Tennessee Valley Authority P.O. Box 2000 Decatur, AL 35609 Mr. Pedro Salas, Manager Licensing and Industry Affairs Tennessee Valley . Authority 4J Blue Ridge 1101 Market Street i Chattanooga, TN 37402-2801 l

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