ML20206M282

Forwards Revised marked-up Pages to Proposed Tech Specs Re Criterion for Plugging Steam Generator Tubes Reflecting Change in Wording of Proposal.Changes Not Functionally Different from Changes in 860813 Submittal

ML20206M282
Person / Time
Site:	Mcguire, McGuire
Issue date:	08/18/1986
From:	Tucker H DUKE POWER CO.
To:	Harold Denton, Youngblood B Office of Nuclear Reactor Regulation
References
TAC-61775, TAC-61776, NUDOCS 8608210061
Download: ML20206M282 (6)

Text

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DUKE POWER GOMPANY P.O. BOX 33180 CHAMLOTTE, N.C. 28242 HAL II. TUCKER TELEPHONE vsce emessman (704) 373-4531 wouman emonimmm August 18, 1986 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S Nuclear Regulatory Conunission Wasaington, D.C. 20555 ATTENTION: Mr. B.J. Youngblood, Director PWR Directorate No. 4 Suyect: McGuire Nuclear Station, Units 1 and 2 Docket No. 50-369, 50-370 Steam Generator Tube Plugging Criteria

Dear Mr. Denton:

By letter dated June 24, 1986 and supplemented July 1, 1986, July 23, 1986, August 5, 1986 and August 13, 1986, Duke Power proposed changes to the steam generator tube plugging criteria in the McGuire Nuclear Station Technical Specifications to incorporate the F* criteria for steam generator (S/G) tube plugging. Per dis-cussions between our respective staffs, please find attached revised pages of the proposal. Only the affected pages are attached and the changes from the August 13, 1986 letter are minor wording changes and clarifications - no change to the intent of the proposal is made.

This submittal supplements an earlier proposal, thus no license fees are enclosed.

Duke Power believes that sufficient information has been submitted and discussions between our respective staffs have been sufficient to assure prompt, positive technical closure of this issue to support the scheduled August 19 entry into Mode 4 (Hot Shutdown), however, please feel free to contact us if you require any additional information.

Very truly yours, gM Hal B. Tucker JBD/66/jgm Attachment 8608210061 860018 \

PDR ADOCK 05000369 P PDR h) .

Mr. Harold R. Denton August 18, 1986 Page 2 xc: w/ attachment.

Dr. J. Nelson Grace Mr. Dayne Brown, Chief Regional Administrator Radiation Protection Branch U.S. Nuclea.: Regulatory Commission Division of Facility Services Region II Dept. of Human Resources 101 Marietta Street, NW, Suite 2900 P.O. Box 12200 Atlanta, Georgia 30323 Raleigh, N.C. 27605 Mr. W.T. Orders Mr. Darl Hood, Project Manager NRC Resident Inspector Division of Licensing McGuire Nuclear Station Office of NRC Washington, D.C. 20555

> 0 e e ATTACID0DIT I

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REACTOR COOLANT SYSTEM SURYEILLANCE REquiantENTS (Continued) 4.4.5.4 Acceptsase Criteria

a. As used in this specification:

1)

Imperfection means an esception to the dimensions, finish or contour of a tube from that required by fabrication drawings specifications. tube us11 thickness, if detectable, may be considered as aa=4==1 imperfections:

2)

Dearsdation means a service-induced cracking,

wastage, wear or general corrosiest occurring on either inside or outside of a tube; 3)

Desraded Tube means a tube containing imperfections greater thsa or .

equal to 20% of the naminal wall thickness caused by degradation;

% Degradation means the percentage of the tube wall thicknees 4) affected or removed by degradationg Defect means an imperfection of such severity that it aseeeds the 5) plugging limit. A tube containing a defect is defectiver 6)

Plusains Limit means the imperfection depth at or beyond which the tube shall be removed from service Thisand is equaldoes definition to 40%

not of the to apply nominal tube wall thickness.tubesheet region below the Fe distance provided -t/u "

the area of the! ca. no in&canm y crack >ng) .0Hvn rh r clamnce.

is nordrgruoiro j

7) Unserviceable describes the condition of a tube if it leaks or l contains a defect large enough to affect its structural integrity in the event of an Operating Basis Earthquake, a loss-of-coolant accident, or a stesa line or feedwater line break as specified in -

4.4.5.3c, above; Tube Inspection means an inspection of the steam generator tube

8) from the point of entry (hot les side) completely around the U-bend to the top support of the cold leg; and NOTE 1r The application of F* exp/<ws are the enc /of the /effd, fee / cp/e 4,*,. gaef f.especpyye utti7:

3/4 4-14 McGUIRE - UNITS 1 and 2

REACTOR COOLANT SYSTEN SURVEILLANCE REQUIREMEN 3 (Continued) 9)

Preservice T==ection means an inspection of the full length of each tube in each steam generator performed by addy dition of current techniques the tubing.

prior to service to establish a baseline conThis in hydrostatic test and prior to initial POWER OPERATION using the equipment and techniques expected to be used during subsequent inservice inspections.

Fe Distance is the distsace.into the tubesheet f' romlower the top face of

10) the tubesheet or the top of the last hardroll, whichever is i (further into the tubesheet) that has been conservatively chosen to l' h

f 0 (Insen be2 inches.h o teac. hec d ,

b. The steam generator shall be determined CFEIAB '

all tubes containing chrough-wall cracks) required by Table 4.4-2. .

4.4.5.5 Reports f

a.

Within 15 days following the completion of each inservice inspection o steam generator tubes, the number of tubes plugged in each steam generator shall be reported to the Commission in a Special Report pursuant to Specification 6.9.2; b.

The complete results of the steam generator tube inservice inspection shall beThis submitted to the Commission in a Speci Special Esport shall include:

inspection.

I 1)

Number and extent of tubes inspected, Location and percent of umil-thickness penetration for each 2) indication of an imperfection, and 3)

Identification of tubes plugged.

results of inspeertons of F" tube.s shall le. repor-rectthe. to

! c. The to the, hc. tor 3 ONRR pr < or- to tbt (Om M (SS (O n. In a re pcet re.p ort shall of -the unrt-fo llowing the. inspection , This reston in clude :

1. tubes, and 0 Idenuhc.arcors el F of the, de.gca dation.

2) Locotton and s, p_ I Amendment No. (Unit 1)

Amendment No. (Unit 2)

.7/9 4-IS McGutte - units i and 2

..?..

l F* TUBE is a tube with degradation equal to or greater than 40% below the F*

distance and not degraded U.e.. no lodIcarecyns of cructic.q } ret flu F# destance-l

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