View source for W3P84-1391, Forwards Nuclear Plant Island Structure Wall Hairline Cracks Evaluation, Per 840327 Onsite Review Meeting

{{Adams
| number = ML20090J741
| issue date = 05/16/1984
| title = Forwards Nuclear Plant Island Structure Wall Hairline Cracks Evaluation, Per 840327 Onsite Review Meeting
| author name = Cook K
| author affiliation = LOUISIANA POWER &amp; LIGHT CO.
| addressee name = Knighton G
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000382
| license number = 
| contact person = 
| document report number = W3P84-1391, NUDOCS 8405230202
| package number = ML20090J744
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 3
}}

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LOUISIANA            242 ouAnoNoe sincer P O W E R & L i G H T! P O Box 60G8
* NEW ORLE ANS. toutstANA                                                                                                                70174 e 1504) 360 2343 UrT00SvEU May 16, 1984 W3p84-1391 3-A1.16.07 Director of Nuclear Reactor Regulation Attention: Mr. G.W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U.S. Nucicar Regulatory Commission Washington, D.C. 20555

==SUBJECT:==
Waterford 3 SES Docket No. 50-382 Additional Information on NPIS Basemat Cracks

==Dear Sir:==

A technical review meeting was held on March 26, 1984 in Bethesda, Md. to discuss the Nucicar plant Island Structure Basemat and the hairline cracks observed in the top of the basemat. This meeting was continued on March 27, 1984 at the Waterford 3 site. During the site tour a number of hairline cracks were observed on the vertical surfaces of the ring wall and cooling tower storage pool wall.
LP&L agreed at the meeting to mapping of the vertical cracks and to initiate a review by Ebasco and liaratead Engineering Associates (llEA) to develop conclusions as to the origin of the hairline cracks and their significance to, or interrelationship with, the basemat cracks.
Following the meeting, Ebasco was instructed to prepare maps showing the location of the vertical hairline cracks and to ovaluate the significance.
This report Attachment I, was transmitted to llEA for their subsequent review and development of an independent position on the significance of the hairline cracks. The ilEA report is included as Attachment II.
Both Ebasco and llEA have concluded that the hairline cracks on the vertical surfaces are drying shrinkage cracks and not a result of any loading mechanism. The conclusion is "...it is concluded that a structural inter-relationship cannot be established between cracks on surf aces of wall and basemat."
If you have any questions concerning the attached report, please contact me.
Yours very truly, 44 /
K. W. Cook Nuclear Support & Licensing Manager g\
J 0405230202 040516                                                                                                                                                                   !
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