ML20087N344

Final Potentially Reportable Deficiency 157 Re Broken/ Cracked Corbel Supporting Missile Shield Above Main/ Emergency Feed Line.Initially Reported on 840224.Condition Not Reportable Per 10CFR50.55(e)

ML20087N344
Person / Time
Site:	Waterford
Issue date:	03/22/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
157, W3K84-0668, W3K84-668, NUDOCS 8404030356
Download: ML20087N344 (2)

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I OUISIANA 242 octAnoNot sincer P O W E R & Li G H T! P O BOX 6008 . NcW ORLFANS. tOUISIANA March 22, 1984 70174

• (504) 366 2345 W3K84-0668 Q-3-A35.07 Mr. John T. Collins M@20WM3 Regional Administrator, Region IV U. S. Nuclear Regulatory Commission i N 611 Ryan Plaza Drive, Suite 1000 ,

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Arlington, Texas 76012 --

REFERENCE:

Telecon C. Hooper (LP&L) and D. Hunnicut (NRC IV) on February 24, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Potentially Reportable Deficiency No. 157 "Possible Missile Hazard Above Main / Emergency Feed Line" Final Report On February 24, 1984, a problem with a broken / cracking corbel supporting the missile shield above the Main / Emergency Feed line was reported as PRD No. 157.

Further evaluation of the previously described condition indicates this condition is not considered reportable pursuant to 10CFR50.55(e).

EVALUATION The item consists of cracked and spalling concrete areas of the vertical walls directly below two beam seats for the missile protection grating (RAB elevation, 70.50 Penetration Area).

The beam seat described in NCR-7118 was installed projecting past (overhanging) the face of the wall, resulting in cosmetic concrete spalling from the loaded corner at the edge of the wall. The spalling has no structural significance and the reinstallation of corner concrete and beam seat grout per original design (i.e., not bearing on the corner) will prevent recurrence. There is no safety-related equipment under this beam seat which would be impacted by falling concrete fragments so no missile hazard existed.

The beam seat described in NCR-W3-7269 was installed on a reinforced concrete corbel. Based on observation of partially exposed bars in the spalled area, the reinforcing apparently suffered local mechanical damage which displaced the bars from the design location. This led to cracking of concrete in the 8404030356 840322 PDR ADOCK 05000382 S PDR b37 0

r i:

Mr. John T. Collins -

March 22 1984 W3K84-0658.

-Page 2-plane of the anchor bolts, but no loss of structural support for the beam since it rests on sound concrete inside the anchor bolts. To prevent recurrence the repair will modify the beam seat so that no load is carried outside the anchor bolts. There is no safety-related equipment under this beam seat which would be impacted by falling concrete fragments so no missile hazard exist.

Based on the above evaluation.this condition is not considered reportable.

Very truly yours,-

M T. F. Gerrets Corporate Quality Assurance Manager TFC:CNH:VBR cc: Director Office of; Inspection & Enforcement U. S. Nuclear Regulatory Commission-Washington, D.C. 20555 (15 copies)

Director-Office of-Management Information and Program Control

-U. S.; Nuclear Regulatory-Commission Washington, D.C.- 20555 Mr. E. L. Blake Shaw, Pittman, Potts & Trowbridge

.1800 M Street, N.W.

Washington, D.C. 20036 Mr. W..M. Stevenson 1 Monroe & Lemann.

1424 Whitney Building New Orleans, Louisiana 70130 Mr. We A. Cross 7910 Woo'dmont Avenue Suite: 1200 Bethesda. Maryland 2'0814 L