ML20009F633

Final Deficiency Rept Re Fl Steel Corp Undersized Fillet Welds W/Craters,Excessive Undercut,Lack of Fusion & Porosity Initially Reported 801121.Welds Repaired by Fl Steel Following Insp

ML20009F633
Person / Time
Site:	Yellow Creek
Issue date:	04/21/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8107310369
Download: ML20009F633 (2)

Text

,

f

' LI*COPV TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 37401 400 Chestnut Street Tower II *

';l.1 ,. t.l -

April 21, 1981

[p.,g/p g -

h$~hlh 0h/ ' f /,

//

Mr. James P. O'Reilly, Director -- 4 Office of Inspection and Enforcement j. 4 D? ggg\# ;

U.S. Nuclear Regulatory Commission - -

Region II - Suite 3100 C o S 101 Marietta Street Atlanta, Georgia 30303  %'Q/g 6'

Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - FLORIDA STEEL DEFICIENT WELDS -

NCR YC-124 - FINAL REPORT The subject deficiency was initially reported to NRC-OIE Inspector M. Thomas on November 21, 1980, in accordance with 10 CFR 50.55(e).

This was followed by our first interim report dated December 20, 1980.

Enclosed is our final report. We consider 10 CFR 21 applicable to this deficiency.

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

. M. Mills, Manager Nuclear Regulation and Safety s

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

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 2055 g

s of 8107310369 810421 PDR ADOCK 05000566 PDR An Eaual Opportunity Employer S

s O

~

e6

~ ~

ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 -

FLORIDA STEEL DEFICIENT WELDS NCR YC-124 10 CFR 50.55(e)

FINAL REPORT Description of Deficiency ,

Structural members were shipped from Florida Steel Corporation to the Yellow Creek site. The members appeared to have undersized fillet welds, craters, excessive undercut, lack of fusion and porosity. In addition, some land dimension exceeded design dimension at welds connecting beams to flanges.

Safety Implications Had the structural steel members failed because of inadequate welds, the structures that contained these members (floors, elevator shafts, and walls of the containment as well at the Auxiliary BuildLig) could have failed.

The possibility of failures of this nature represent an unacceptable degradation of the overall safety of the plant.

Corrective Action During the period from March 9 through April 6, 1981, representatives of Florida. Steel Corporation were at Yellow Creek Nuclear Plant repairing the matarial of the subject deficiency. All welded members of the structural steel floor framing, elevator framing, and columns inside containment for the Reactor Buildings were 100 peceent inspected by the Yellow Creek Quality Control Welding NDE Inspectors. Following the inspection, repairs were made by Florida Steel employees, and the repairs were reinspected and judged acceptable by TVA NDE inspectors.

Poorly welded structural steel was released for ship wnt from the vendor's plant after receiving a surveillance inspection by a TVA source inspector.

TVA is investigating its program of source inspection in a separate nonconformance report, YCN QAB 8101.

p . .r- -

.:.g

.q%hm. 6 m ==miA_.A. * --~ _a h_l. _+