ML20245B288

Advises That Util 890208 Response to NRC Bulletin 88-009, Thimble Tube Thinning in Westinghouse Reactors, Acceptable

ML20245B288
Person / Time
Site:	Sequoyah
Issue date:	06/15/1989
From:	Black S Office of Nuclear Reactor Regulation
To:	Kingsley O TENNESSEE VALLEY AUTHORITY
References
IEB-88-009, IEB-88-9, TAC-72682, NUDOCS 8906230116
Download: ML20245B288 (4)

Text

,'

04

{

}

.. wnou o

UNITED STATES NUCLEAR REGULATORY COMMISSION n

h.' '

WASHINGTON, D. C. 205$5 o

8

,o June 15, 1989

• ...+

Docket No. 50-328 Mr. Oliver D. Kingsley, Jr.

Senior Vice President, Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801

SUBJECT:

THIMBLE TUBE THINNING IN WESTINGHOUSE REACTOR (BULLETIN 88-09, MPA X8-09) (TAC 72682) - SEQUOYAH NUCLEAR PLANT, UNIT 2 By letter dated July 26, 1988, the staff issued NRC Bulletin 88-09, " Thimble Tube Thinning in Westinghouse Reactors."

In the Bulletin, the staff requested each licensee for Westinghouse-designed nuclear power reactors that utilize bottom mounted instrumentation, establish an inspection program to monitor thimble tube performance.

Sequoyah is such a reactor.

In its letter dated February 28, 1989, the Tennessee Valley Authority (TVA) submitted its thimble tube inspection program for Sequoyah, Unit 2, and the results of its first inspection on Unit 2.

This inspection was conducted during the recent Unit 2 Cycle 3 refueling outage.

The Unit 1 thimble tubes will be first inspected in the upccning Unit 1 Cycle 4 refueling outage scheduled for the spring of 1990.

TVA stated that the wear acceptance criteria for the Unit 2 thimble tubes are dS follows:

(1) Wear equal to or greater than 60-percent through-wall loss requires thimble tube plugging, (2) wear equal to or greater than 30-percent and less than 60-percent through-wall loss requires repositioning the thimble by a minimum of one and one half inch, and (3) less than 30-percent through-wall loss requires no corrective action for the next fuel cycle.

The inspection frequency has been established for Unit 2 by TVA as each refueling outage until a data base is established and the inspections will be accomplished by eddy current testing.

TVA provided a list of the 16 tubes with equal to or greater than 30-percent through-wall loss, their location, and their most severe through-wall loss percentage.

TVA stated that these tubes will be evaluated in accordance with the wear criteria provided above and dispositioned in accordance with the program.

The staff has reviewed the thimble tube wear acceptance criteria, inspection frequency, and inspection methodology provided in TVA's letter dated February 28, 1989 and concludes that they are acceptable and adequately h

I gg62run Dge Q

L Mr. Oliver D. Kingsley, Jr. address the actions requested in the bulletin.

Records generated during the development of the thimble tube inspection program and of the results of the inspections at Unit 2 shall be documented and maintained in accordance with plant procedures.

These records may be the subject of a future inspection.

This closes out the staff's review on Bulletin 88-09 for Sequoyah, Unit 2.

?

The staff's evaluation of the' bulletin for Unit I will be the subject of a separate letter.

i Sincerely, 1

~0riginal signed by Suzanne _ Black, Assistant Director for Projects TVA Projects Division Office of Nuclear Reactor Regulation l

cc: See next page j

i 1

Distribution Docket File J. Donohew l

NRC PDR GPA/CA Local PDR B. Hayes ACRS(10)

ADSP Reading GPA/PA D. Crutchfield B. Grimes B. D. Liaw E. Jordan S. Black L. Watson R. Pierson M. Simms B. Wilson B. Ruckley T. Quay G. Georgiev J. Brady D. Terao K. Jenison OGC SQN Rdg. File j

KEccleston l

j l

l l

l

• SEE PREVIOUS CONCURRENCE 1

0FC

NRR:TVA/LA* :hRR:TVA/PM* :NRR:TVA/PM* :NRR:EMEB/BC* NRR:TVA/BC*:TVA: AD/TP* :TVA: AD/h

.....:......--....:___..........:........-__:-__-__...-_:.___......:.......____:....A4f'A...

i NAME :MSimms

JDonohew:as

GGeorgiev

LMarsh

DTerao RPierson SBlacT DATE :6/1/89

6/1/89

6/1/89

6/12/89

6/1/89

6/2/89

6/j'f[89 0FFICIAL RECORD COPY

j Mr. Oliver D. Kingsley, Jr. cc:

General Counsel Mr. Kenneth M. Jenison-Tennessee Valley Authority Senior Resident Inspector 400 West Summit Hill Drive Sequoyah Nuclear Plant E11 833

.U.S. Nuclear Regulatory Connission Knoxville, Tennessee. 37902 2600 Igou' Ferry. Road Soddy Daisy, Tennessee' 37379 j

Mr.:F. L. Moreadith Vice President, Nuclear: Engineering Mr. Michael H. Mobley, Director Termessee Valley Authority Division of Radiological Health 400 West Summit Hill Drive T.E.R.R.A. Building, 6th Floor W12 A12 150 9th Avenue North Knoxville, Tennessee 37902 Nashville, Tennessee 37219-5404 Dr. Mark 0. Medford

'Dr. Henry Myers Science Advisor

)

Vice President'and Nucleer

. Committee on' Interior Technical-Director and Insular Affairs Tennessee Valley Authority

.U.S. House of Representatives-SN 157B Lookout Place Washington, D.C.

20515 6

Chattanooga, Tennessee '37402-2801 Tennessee. Valley Authority Mr. M. J. Ray, Acting Director Rockville Office

.)

Nuclear Safety and Licensing 11921 Rockville Pike j

Tennessee Volley Authority Suite 402.

20852 1

SN 157B Lookout Place Rockville, Maryland Chattanooga, Tennessee 37402-2801 Mr. John L. LaPoint Site Director Sequoyah Nuclear Plant Tennessee Valley Authority P. O. Box 2000 Soddy Daisy, Tennessee 37379 Mr. M. Burzynski Acting Site Licensing Manager Sequoyah Nuclear Plant P. O. Box 2000 1

Soddy Daisy, Tennessee 37379 County Judge Hamilton County Courthouse Chattanooga, Tennessee 37402 i

Regional Administrator, Region II U.S. Nuclear Regulatory Connission 101 Marietta Street, N.W.

Atlanta, Georgia 30323

-.3 l

l l

\\

i Mr. Oliver D. Kingsley, Jr. The staff has reviewed the thimble tube wear acceptance criteria, inspection frequency, and inspection methodology provided in TVA's letter dated February 28, 1989 and concludes that they are acceptable and adequately address the actions requested in.the bulletin.. Records generated during the development of the thimble tube inspection program and of the results of the -

inspections at Unit 2 shall be documented and maintained in accordance with plant procedures. These records may be subject of a future inspection. This i

I closes out the staff's review on Bulletin 88-09 for Sequoyah Unit 2.

The staff's evaluation of the bulletin for Unit I will be the subject of a separate letter.

Sincerely, i

Suzanne C. Black, Assistant _ Director TVA Projects Division l

Office of Nuclear Reactor Regulation

]

cc: See next page DISTRIBUTION Docket File J. Donohew NRC PDR GPA/CA l

Local PDR B. Hayes l

Projects Rdg.

ACRS(10)

ADSP Rdg.

GPA/PA D. Crutchfield B. Grimes B. D. Liaw E. Jordan S. Black L. Watson R. Pierson M. Simms B. Wilson B. Buckley T. Quay G. Georgiev J. Brady D. Terao K. Jenison 0GC SQN Rdg. File KEccelston NRR EST EMEB

[b.M

/ /

II

/

NRR:EMEB/BC

. 6.

hr LMarsh

/

I

(,, /I2489 0FC _:NRR:TVA/LA NR M

NRR:TVA/P

TVA:

P

NRR:TVA/BC :

R:PD2/P :TVA:AD/P l

l

....:........ gf:...

...__:. __.., g : _.

MME :MSimms

JD ew:as

GGeorgi /i/ :RPi on

DTerao.

BBuc ey

SBlack i

DATE ', /89

6/(f89

6// /89

6/3 /89

6/ / /89

/89

6/ /89 i

OFFICIAL RECORD COPY I

l

_ _ ____ _ _ - _ - - -