ML18029A555

Clarifies Position That Leakage Monitoring Frequencies & out-of-svc Times in Tech Specs Sufficient to Detect Leaks Caused by through-wall Cracks in Timely Manner.More Restrictive Leakage Monitoring Limits Unwarranted

ML18029A555
Person / Time
Site:	Browns Ferry
Issue date:	05/22/1985
From:	Domer J TENNESSEE VALLEY AUTHORITY
To:	Vassallo D Office of Nuclear Reactor Regulation
References
GL-84-07, GL-84-11, GL-84-7, TAC-55590, TAC-55591, TAC-55592, NUDOCS 8505290155
Download: ML18029A555 (6)

Text

SUBJECTS Clarifies position that leakage monitoring frequencies 8

out-of svc times in Tech Specs sufficient to detect leaks'aused by through"wall cracks in timely manner.'More restrictive. leakage monitoring limits-unwarranted.

DISTRIBUTION CODE:

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ACCESSION NBR:8505290155 DOC ~ DATE'5/05/22 NOTARIZED:

YES DOCKET' FACIL:50-259 Browns Ferry Nuclear Power Stations Unit 1, Tennessee 05000259

$ 0-260 Browns Ferry Nuclear Power Station~

Unit 2E Tennessee 05000260 50-296 Browns Ferry Nuclear Power Stations Uni,t 3< Tennessee 05000296 AUTH ~ NAME 'UTHOR AFFILIATION DOMERpJ ~ AD Tennessee Valley Authority RECIP ~ NAME

'ECIPIENT AFFILIATION VASSALLOEDF 8'perating Reactors Branch 2

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l TENNESSEE VALLEYAUTHORITY CHATTANOOGA, TENNESSEE 37401 400 Chestnut Street Tower II May 22, 1985 Director of Nuclear Reactor Regulation Attention:

Mr. Domenic B. Vassallo, Chief Operating Reactor Branch No.

2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Vassallo:

In the Matter of the Tennessee Valley Authority Docket Nos. 50-259 50-260 50-296 By letter from H. R. Denton to H.

G. Parris dated October 12, 1984, NRC approved the startup of Browns Ferry. Nuclear Plant unit 3.

The letter also requested that TVA submit proposed technical specifications requiring monitoring of sump level for drywell leak detection every four hours and also reduction of allowable out-of-service time for inoperable leakage monitoring instruments from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

The Browns Ferry technical specificati.ons currently require drywell leakage measurement and recording every eight hours, and permit an allowable out-of-service time of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

These requirements were established by the NRC in the issuance of amendment Nos.

94, 87, and 60 to units 1, 2, and 3

licenses, dated December 27, 1983.

These requirements are more restricti.ve than those in effect before issuance of those amendments.

Subsequent to that time, NRC issued Generic Letter 84-11 dated April 19,

1984, which specified more restrictive leakage monitoring limits.

Our response dated June 7,

1984 indicated differences between Browns Ferry leakage monitoring procedures and those specified by the generic letter.

It is our position that, the leakage monitoring frequencies and out-of-service times currently in the technical specifications are suffi.cient to detect leaks caused by through-wall cracks in a timely manner.

We believe that more restrictive leakage monitoring limits are not warranted based upon the level of inspection and repairs which have been performed on the Browns Ferry units and the low probability that intergranular stress corrosion cracking (IGSCC) will result in a catastrophic piping fai.lure.

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Director of Nuclear Reactor Regulation May 22, 1985 If you need any additional information, please get in touch with us through the Browns Ferry Project Manager.

Very truly yours, TENNESSEE VALLEY AUTHORITY J. A. Domer, Chief Nuclear Licensing Branch Sworn t and ubscrib this HM day of ore me 1985 Nota Public My C mmission Expires F

CC:

U.S. Nuclear Regulatory Commission Region II Attn:

Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. R. J. Clark Project Manager Browns Ferry Nuclear Plant U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue

Bethesda, Maryland 20814

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