ML19332A001

Final Interim Deficiency Rept Re Spray Header Attachment Lug re-evaluation.Lug Attachments for Containment Spray & RHR Sys Headers Not Properly Evaluated When Supports Reanalyzed for Steel Containment Vessel Dynamic Movements

ML19332A001
Person / Time
Site:	Sequoyah
Issue date:	08/07/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:
References
10CFR-050.55E, 10CFR-50.55E, NCR-SQN-SWP8009, NUDOCS 8009100284
Download: ML19332A001 (2)

Text

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, TENNESSEE VAULEY AUTHORITY CH ATTANOOGA. Ti(NNESSEE Jyt ,- {.;,

400 Chestnut Street Tower'rL;, .

August 7,f1980 g ,; g' ; 4 2 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Region II - Suite 3100 101 Marietta Street -

Atlanta, Georgia 30303

Dear Mr. O'Reilly:

SEQUOYAH NUCLEAR PLANT UNIT 2 - SPRAY HEADER ATTACHMENT LUG REEVALUATION - NCR SQN SWP 8009 - FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R. McFarland on July 9, 1980, in accordance with 10 CFR 50.55(e).

Enclosed is our final report.

If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.

Very truly yours, TENNESSEE VALLEY AUTHORITY Il\ fAJA L. M. Mills, Manager y"

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Nuclear Regulation and' Safety i l

Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuc1 car Regulatory Commission Washington, DC 20555 g \

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, An Equal Opportunity Employer S ,

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ENCLOSURE o ,

- SEQUOYAd NUCLEAR PLANT UNIT 2 SPRAY HEADER ATTACHMENT LUG REEVALUATION 10CFR50.55(e)

NCR NO. SQN SWP 8009 FINAL REPORT Description of Deficiency The support lug attachments in the containment dome for the containment spray and residual heat removal system headers were not properly evaluated when the supports were reanalyzed for steel con-tainment vessel dynamic movements during a design basis accident (DBA). .

Safety Implications It is imperative that the support lug attachments for the containment spray and residual heat removal system headers be properly evaluated during analysis to ensure seismic integrity of the support system.

Safety system failure and interaction with other safety systems could have resulted if the lug at. achments had come loose during a seismic event.

Corrective Action TVA has recently completed reanalysis of the support lug attachments tor the containuent spray an6 rTsidual neTt~Teticv3T cystecrteaders.

The support lug attachments will perform their designed functions.

TVA will enFure, in the future, that all support components making up a support assembly are considered when being evaluated.

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