ML20085G851

Final Deficiency Rept Superseding 741107 Rept Re Laminations in Main Steam Line Piping Tee.Initially Reported on 740909. Defective Tee Replaced Subsequent to Thorough Insp

ML20085G851
Person / Time
Site:	Browns Ferry
Issue date:	11/25/1974
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Knuth D US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G854	List: ML20085G851 ML20085G855
References
NUDOCS 8308290456
Download: ML20085G851 (4)

Text

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f TENNEGSEE CH ATTANCOGA, VALLEY ALITHOPITY L! ag' 7 q TENNESSEE g 374G'l .Jem .- .), a 1

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' November 25, 1974 . . .

ANN 4VCASARY 05ErY[ns/iU l

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Mr. Donald F. Knuth, Director

. Directorate of Pagulatory Operations ,

+ U.S. Atomic Energy Commission Washington, DC 20545 1

Dear Mr. Knuth:

3 l BROWNS FERRY NUCLEAR PLidiT UNIT 3 - POTENTIAL DEFICIENCY ON LAMINATIONS IN MAIN STEAM LINE PIPING TEE This report supersedes my November 7, 1974, letter concerning j the subject potential deficiency. Under the heading, "Cause i of Deficiency," of the November 7 report, we incorrectly j stated that M. W. Kellegg Company manufactured the defective

' tee. We submit the enclosed final report as the corrected i

response to the potential deficiency.

Very truly yours, l i AEUaf J. E. Gilleland Assistant to the Manager of Power l'

Enclosure p CC (Enclosure):

! Mr. Norman C. Moseley, Director i

Directorate of Regulatory Operations U.S. Atomic Energy Commission Region II - Suite 818 230 Peachtree Street, NW.

Atlanta, Georgia 30303 6

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' ENCLOSURE 6

BROWNS FERRY NUCLEAR PLANT UNIT 3 l

LAMINATION OF MAIN STEAM LINE "C" TEE l

1 FINAL REPORT - NOVEMBER 20. 1974 On September 9, 1974, an initial report was made on the subject deficiency by R. T. Rathcote to N. Economos, AEC-DRO Inspector, Region II, during an inspection by N. Economos.

Description of Occurrence On September 6, 1974, during weld preparation on the subject tee, an indication of a lamination waIs found in the veld prep area. A complete ultrasonic examination of the tee was performed on September 7 and 8.

Arrangements have been made to borrow a replacement tee from the Penn.sylvania Power and Light Company. The replacement tce has been subjected to nondestructive tests with satisfactory results. The replacement tee is currently being inspected again at the site and will be installed once it is determined that all these test results are satisfactory.

Cause of Deficiency The subject tee was f abricated from a rolled plate of carbon steel.

The laminations were originally caused by the rolling process which produced the carbon steel plate.

The defective tee was manufactured by the Tube Turn Company and furnished to the M. W. Kellog'g Company for incorporation in the piping assembly contracted for by General Electric as part of the Browns Ferry unit 3 piping system. The replacement tee was also supplied by the same subcontractors.

Safety Implication It has not been determined that the lamination, had it not been detected, would have caused cracking in the tee. Any cracking would have resulted in a steam release much smaller than that associated with the main steam line break accident. Results of the analysis of the main steam line break accident are presented in Section 14.6.5 of the Browns Ferry Nuclear Plant FSAR.

Corrective Action The defective tee was replaced with a tee of the same type from the 1 same manufacturer. The replacement tee, however, was thoroughly '

inspected before shipping and is being inspected again prior to its .

installation at Browns Ferry. The other main steam line tee in line "B" was ultrasonically tested uithsatisfactory results.

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i Means Taken to Prevent a Recurrence I The subject tee was originally procured according to a now outdated standard. The new standard requires testing on all such equipment and

! establishes maximum allowable limits on laminations.

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