ML20052B700

Clarifies Reasons for Plugging Three Steam Generator Tubes Per Encl Description to Util Ltr W3K-82-0092 & Two Addl Tubes w/through-wall Discontinuity Indications

ML20052B700
Person / Time
Site:	Waterford
Issue date:	02/26/1982
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins, Morvant J, Woodward J FACTORY MUTUAL ENGINEERING CORP., LOUISIANA, STATE OF, NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
W3K-82-0120, W3K-82-120, NUDOCS 8205030471
Download: ML20052B700 (5)

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f LOUISIANA P O W E R, & L I G H T 242 OEunON m Srn m P O BOX 6008

• NEW OnLEANS. LOUISIANA 70174 . (504) 366-2345 NuSO5vsE February 26, 1982 W3K-82-0120

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9 Mr. John T. Collins, Regional Administrator, Region IV j gN U. S. Nuclear Regulatory Commission

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611 Ryan Plaza Drive, Suite 1000 ^ ('. d'.p Arlington, Texas 76012 e 3,

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Mr. John Woodward , ')

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,9 Factory Mutual Engineering s v . ,Q 12 Perimeter Center East, Northwest A'-

Suite 1200 Atlanta, GA 30346 . kp.,N(yi i 2 N f Md Mr. J . W. Motvant Louisiana Department of Labor

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P. O. Box 44063 Baton Rouge, LA 70804 3,

Subject:

Waterford SES Unit #3 Repair Program for the Steam Generator Tube Plugging Re: 1) Docket No. 50-382

2) LP6L Letter W3K-82-0092 Centlemen:

The purpose of this letter is to further clarify the reasons for plugging the three (3) steam generator tubes as described in the enclosure attached to the letter in reference 2. In addition, this letter describes the reasons for plugging two (2) additional tubes which had reportable through wall discontinuity indications.

Also a revised traveler is attached for your information.

s A preservice multifrequency eddy current examination of Steam Generators #1 and #2 were performed in October and November 1981 at the Waterford Steam Electric Station, Unit #3. The examination was requested by Ebasco Services, Incorporated, an agent for Louisiana Power S Light Company, to provide information on the preservice condition of the tubing and establish a baseline for future inservice examinations in these steam generators.

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0 February 25, 1982 W3K-82-0120 The u-tube steam generator bundle consists of 9,350 three-quarter inch l (3/4") outside diameter, .048" average wall thickness nickel-chromium-l rion (inconel) alloy tubes. The examination was performed with the steam generators installed in the containment building in their designed operational (vertical) position using remote fixturing and probe pushing equipment.

In steam generator #1 there was one (1) tube, Row 1 Line 173; and two (2) tubes in steam generator #2; Row 1 Line 165 and Row 1 Line 169 which were obstructed in the u-bend . area and could not be examined. The examination l was originally f rom the inlet tube sheet and those tubes were re-examined from the opposite end to the obstruction in the u-bend. These three (3) tubes will be plugged as no baseline inspection could be established in this area.

One (1) tube in steam generator #1, Row 90 Line 34, had a 21% through wall discontinuity indication originating on the outside diameter of the tube.

The indication was located at the fif th egg crate up from the tube sheet on the outlet side minus one (1) Inch. All other tubes examined in steam j generator #1 were acceptable under the provisions of the United States

! Regulatory Commission Regulatory Guide 1.83.

One (1) tube in steam generator #2, Row 91 Line 61, had a 32% through wall discontinuity indication originating on the outside diameter of the tube. The indication was located at the seventh egg crate up from the tube sheet on the outlet side minus eighteen (18) inches. All other tubes examined were acceptable under the provisions of the United States Regulatory Commission Regulatory Guide 1.83.

l Louisiana Power & Light has evaluated the conditions described above and has

! decided to plug the two (2) additional tubes with reportable through wall discontinuities as dispositioned on nonconformance report W3-3179. If there are any questions regarding this activity, please advise.

Yours very truly, k dyJ,sf/

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ktTLD T. I'. Gerrets Quality Assurance Manager TFG :RAll:gr f l

I cc: L. L. Bass W. M. Morgan, J. Woods, L. A. Stinson, L. V. Maurin, D. B. Lester, R. K. Stampley, P. V. Prasankumar, F. J. Drummond, l Central Records, Nuclear Records l

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