ML20141C170

Informs That Required Actions Completed Re GL 95-03, Circumferential Cracking of SG Tubes. TACs M92274 & M92275 Closed

ML20141C170
Person / Time
Site:	Sequoyah
Issue date:	05/15/1997
From:	Hernan R NRC (Affiliation Not Assigned)
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
GL-95-03, GL-95-3, TAC-M92274, TAC-M92275, NUDOCS 9705160181
Download: ML20141C170 (3)

Text

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j UNITED STATES NUCLEAR REGULATORY COMMISSION i

• WASHINGTON, D.C. 2006H001 l

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. May 15, 1997 j l

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l Mr. Oliver D. Kingsley, Jr.

l President, TVA Nuclear and l Chief Nuclear Officer l Tennessee Valley Authority 6A Lookout Place l 1101 Market Street l Chattanooga, TN 37402-2801 l 1

SUBJECT:

COMPLETION OF LICENSING ACTION FOR GENERIC LETTER 95-03, "CIRCUMFERENTIAL CRACKING OF STEAM GENERATOR TUBES," DATED APRIL 28, 1995, FOR SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 (TAC NOS. M92274 AND M92275)

Dear Mr. Kingsley:

On April 28, 1995, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 95-03, "Circumferential Cracking of Steam Generator Tubes," to all holders of operating licenses or construction permits for pressurized-water reactors. The NRC issued GL 95-03 for ihree principal reasons:

(1) Notify addressees about the safety significance of the recent steam generator tube inspection findings at Maine Yankee Atomic Power Station.

(2) Request that all addressees implement the actions described within the generic letter.

(3) Require that all addressees submit to the NRC a written response regarding implementation of the requested actions.

l In addition, GL 95-03 alerted addressees to the importance of performing comprehensive examinations of steam generator tubes using techniques and equipment capable of reliably detecting the types of degradation to which the steam generator tubes may be susceptible. The staff also noted that the performance of steam generator tube examinations is controlled, in part, by Appendix B to Title 10, Part 50, of the Code of federal Regulations (10 CFR Part 50).

In GL 95-03, the NRC staff also requested that licensees take the following actions: p}

(1) Evaluate recent operat%g experience with respect to the detection and t sizing of circumferential indications to determine the applicability to their plants.

[O (2) On the basis of the evaluation in Item (1) above, as well as past inspection scope and results, susceptibility to circumferential 9705160181 970515 o

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.Hr. Oy Kingsley cracking, threshold of detection, expected or inferred crack growth rates, and other relevant factors, develop a safety assessment l justifying continued operation until the next scheduled steam generator '

tube inspections.

(3) Develop plans for the next steam generator tube inspections as they pertain to the detection of circumferential cracking. The inspection plans should address, but not be limited to, scope (including sample I expansion criteria, if applicable), methods, equipment, and criteria (including personnel training and qualification).

To document the outcome of these actions, the NRC staff requested that addressees prepare and submit the following:

(1) A safety assessment justifying continued operation, predicated on the evaluation performed in accordance with requested actions 1 and 2 (above).

(2) A summary of the inspection plans developed in accordance with requested action 3 (above) and a schedule for the next planned inspection.

In response to GL 95-03, you provided letters dated June 27, 1995 for the Sequoyah Nuclear Plant. This submittal provided the information requested by GL 95-03; therefore TAC Nos. M92274 and M92275 are closed. For your information, the staff's findings regarding this issue are contained in NUREG-1604, "Circumferential Cracking of Steam Generator Tubes."

If you have any questions regarding this matter, please contact me at (301) 415-2010.

Sincerely, Original Signed by Ronald W. Hernan, Senior Project Manager Project Directorate II-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos. 50-327 and 50-328 cc: See next page DISTRIBUTION Docket File 0GC PUBLIC ACRS SQN Reading J. Johnson, RII S. Varga R. Hernan F. Hebdon S. Dembeck

8. Clayton K. Karwoski DOCUMENT NAME: G:\SQN\92774.LTR To receive a copy of this document, Indicate in the box C= Copy w/o attachment / enclosure E= Copy with attachment / enclosure N e No co W OFFICE PM:PD2-3<1E LA:PD2-3 E D:PD2-3 C NAME RHernan h'BClayt h FHebdonN DATE [//]/g7 h /pk/97 $~/h/g7 0FFICIAL RECORD COPY

! k. .Mr. Oliver D. Kingsley, Jr. SEQUOYAH NUCLEAR PLANT Tennessee Valley Authority-cc:

. Mr. O. J. ,Zeringue, Sr. Vice President Mr. J. T. Herron, Plant Manager Nuclear Operations Sequoyah Nuclear Plant l Tennessee Valley Authority Tennessee Valley Authority' 6A Lookout Place P.O. Box 2000

. 1101 Market Street . Soddy Daisy, TN 37379 l Chattanooga, TN 37402-2801

. Regional Administrator i Mr. Jack A. Bailey, Vice President U.S. Nuclear Regulatory Comission

Engineering & Technical Services Region II l Tennessee Valley Authority 61 Forsyth Street, SW., Suite 23T85 6A Lookout Place Atlanta, GA 30303-3415 1101 Market Street

Chattanooga, TN 37402-2801 Mr. Melvin C. Shannon i Senior Resident Inspector l Mr. R. J. Adney, Site Vice President Sequoyah Nuclear Plant i' Sequoyah Nuclear Plant U.S. Nuclear Regulatory Comission Tennessee Valley Authority 2600 Igau Ferry Road P.O. Box 2000 Soddy Daisy, TN 37379

Soddy Daisy, TN 37379

! Mr. Michael H. Mobley, Director

. General Counsel Division of Radiological Health

Tennessee Valley Authority 3rd Floor, L and C Annex ET 10H 401 Church Street 400 West Sumit Hill Drive . Nashville, TN 37243-1532 l Knoxville, TN 37902 County Executive Mr. Raul R. Baron, General Manager Hamilton County Courthouse Nuclear Assurance and Licensing Chattanooga, TN 37402-2801 Tennessee Valley Authority 4J Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Pedro Salas, Manager Licensing and Industry Affairs f

Tennessee Valley Authority 4J Blue Ridge 1101 Market Street Chattanooga, TN 37402-2801 Mr. Ralph H. Shell, Manager Licensing and Industry Affairs Sequoyah Nuclear Plant Tennessee Valley Authority P.O. Box 2000 .,

Soddy Daisy, TN 37379 l l

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