ML20087L232

Final Deficiency Rept 146 Re A-490 Bolts for Framing Above Steam Generators.Initially Reported on 840203.Condition Determined Not Reportable Per 10CFR50.55(e)

ML20087L232
Person / Time
Site:	Waterford
Issue date:	03/15/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
146, W3K84-0612, W3K84-612, NUDOCS 8403270095
Download: ML20087L232 (3)

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9 LOUISIANA ua OuanONOE staar P O W E R & L 1 G H T! P O DOX 6000NEW ORLEAM LOUISIANA 70174 . (P4) 36G 2345 UTT00EsYIU Marct' 15. 1984 W3K84-0612

~ Q-3-A35.07 Ui_@ UR DW M T:

Mr. John T. Collins W202  !

Regional Administrator, Region IV U. S. Nuclear Regulatory Commission JU

[s' g 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

REFERENCE:

Telecon C. N. Hooper (LP&L) and D. Hunnicut (NRC) on February 3, 1984 Telecon C. N. Hooper (LPSL) and W. Crossman (NRC) on March 5, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Potentially Reportable Deficiency No. 146 "A-490 Bolts For Framing Above Steam Generators" Final Report On February 3, 1984, a problem with the bolting above the steam generators was reported as Potentially Reportable Deficiency No. 146. Further evaluation of the previously described condition indicates this condition is not considered reportable pursuant to tia requirements of 10CFR50.55(e).

EVALUATION This concerns twenty (20) 7/8" x 2-3/4" LG A490 bolts whose heat number is the same as the 1" x 2-3/4" LG A490 bolts that were replaced per NCR W3-5627.

After evaluation it is concluded that the incidealt is not reportable for the following reasons:

The 1" bolt failure may be attributed to excessive thread galling or introduction of bending on the bolt while calibrating impact tool wrenches. The replacement of the 1" was an expedient measure, in lieu of performing investigation into cause of failurm This investigation vould have been similar to that performed under NCR W3-6534, where bolts failed under similar conditions and were found to be satisfactory.

8403270095 840315 PDRADOCK05000g S

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'Mr.' John T. Collins March 15,-1984

-93K84LO612 Yage 2 Even themgh the 7/8" A490 bolts in question have the same chemical

- composition as the 1" A490 replaced bolts, the fabrication production process for different bolt sizes results in different physical strength

~

characteristics.- This can be readily.seen on the bolt certification sheets, therefore 7/8;' and 1" bolt behavior are not identical and common heat number alone. is insufficient reason to reject the other bolts.

We are unable to ascertain whether the 7/8" bolts in question were discarded with the 1" bolts, are misplaced, or have been installed on site; however, should the 7/8" bolts have been installed, the F installation had to adhere to site procedures, that is the bolts would be installed and inspected by either the turn of nut-method or torque method. In either case these bolts either failed on installation or are holding the desired pretensioning for friction type connectors.

One' characteristic of A490 class Lolts is bolt popping, that is when bolt failure occurs, this failure is immediate and total. Therefore, any bolts installed are satisfactory.

Very.truly yours.

T$k~kk$~

T..F. Garrets Corporate Quality Assurance Manager

.TFG:CNH:SSTG cc: ~ Director-Office of. Inspection & Enforcement U. S. Nuclear Regulatory Commission

- Washington, D.C. 20555 Director

- Office of Management

'e Information and Program Control ~

^

U. S.= Nuclear Regulatory Commission Washington, D.C. 20555

Mr.:E. L. Elake Shaw,- Pittman, Potts & Trowbridge-1800 M Street, N.W.

", ~ Washington, D.C.- 20036 h

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- + Mr. John T.. Collins March 15, 1984

- W3K84-0612 Page 3-l-

cc: Mr. W. M. Stevenson l

Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130 Records Center Institute of Nuclear Power _ Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 Mr. W. A. Cross 7910 Woodmont Avenue

-Suite 1200 Bethasda, Maryland 20814 1

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