W3P84-3319, Forwards Rev 2 to Summary Evaluation Structural Significance of Basemat NDT Results, Supplementing Addl Info Provided in & Per NRC 841120 Meeting.Cracks Do Not Affect Basemat Integrity

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Forwards Rev 2 to Summary Evaluation Structural Significance of Basemat NDT Results, Supplementing Addl Info Provided in & Per NRC 841120 Meeting.Cracks Do Not Affect Basemat Integrity
ML20099L249
Person / Time
Site: Waterford Entergy icon.png
Issue date: 11/28/1984
From: Cook K
LOUISIANA POWER & LIGHT CO.
To: Crutchfield D
Office of Nuclear Reactor Regulation
Shared Package
ML20099L252 List:
References
W3P84-3319, NUDOCS 8412010064
Download: ML20099L249 (2)


Text

a Louisiama ,.eoe - O~O 1 . .e -xeme P O W E R & L i G H T f NEW ORLEANS 70174-000.

LOUISIANA . (504)366-2345 MIDDLE SOUTH NES SWEM November 28, 1984 W3P84-3319 3-A1.16.07 A4.05 Director of Nuclear Reactor Regulation ATTN: Mr. Dennis M. Crutchfield, Asst. Director for Safety Assessment Division of Licensing U.S. Nuclear Regulatory Commission Washington, D. C. 20555

SUBJECT:

WATERFORD 3 SES ADDITIONAL INFORMATION ON BASEMAT IIAIRLINE CRACKS

References:

Letter W3P84-3142, K. W. Cook to D. M. Crutchfield, dated November 7, 1984.

Dear Mr. Crutchfield:

The purpose of this letter is to supplement the additional information provided in the referenced letter. This information was requested by the NRC and Brookhaven National Laboratory personnel at a meeting in Bethesda, Maryland on November 20, 1984.

Attached is Revision 2 of the report entitled " Summary Evaluation Structural Significance of Basemat Nondestructive Testing Results". This revision addresses questions discussed among parties at the November 20, 1984 meeting. Further infor-mation regarding the degree of confidence in NDT results, probable causes of cracks, mechanisms for deep narrow cracking, construction controls, shear considerations, slip resistance, etc.

Louisiana Power & Light remains firmly convinced that the cracks, as defined by NDT have no adverse affect on the structural integrity of the basemat. The basemat is fully capabic of functioning as required by the design in accordance with the pertinent codes.

Very truly yours,

f. a. Gra y K. W. Cook Nuclear Support & Licensing Manager KWC:plc ATTACllMENT
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