ML20090J750
| ML20090J750 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 04/30/1984 |
| From: | Hasan N, Liu P EBASCO SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20090J744 | List: |
| References | |
| NUDOCS 8405230206 | |
| Download: ML20090J750 (67) | |
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i 1 ! LOUISTANA POWER AND LIGHT COMPANY WATERFORD STEAM ELECTRIC STATION j UNIT NO.1 l' NPIS WALL HAIMLINE LRACKS EVALUATION i s > >\ 12- -75 TO
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BLOCK NUMBER BLOCK PLACEMENT (' [ 3-30-76 DATE ( caTt dA /td WATERFORD SES UNIT NO. 3 BASEMAT PLACDfENT SEQUENCE AhT DIFFERENTIAL SETTLEMENT CONTOURS Figure 1 EBASCO SERVICES INCORPORATED ,_
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EBASCO interoffice correspondence o V DATE 3/30/84 FILE REF. 6Q-p-g TO B Grant OFFICE LoOATION Waterford Site l I ROM E. S. Kowalski/P.C. Liu OFFICE LOCATION SUBJECTWATERFORD SES UNIT NO. 3 NUCLEAR PLANT ISLAND STRUCTURE WALL HAIRLINE CRACK MAPPING PROCECURE This subject procedure is attached for your use in mapping the wall hairline cracks of NPIS. O ESK/PCL:lh Attach. cc: J L Ehasz l G A Kanakaris A H Wern J J Costello Project File
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i RO -. March 30,.1984 LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 j WALL HAIRLINE CRACK MAPPING PROCEDURE
- 1. The exposed wall surfaces in the areas between Reactor Building and wet and dry cooling towers, and between Fuel Handling and Reactor Auxiliary Buildings shall be visually inspected for the presence of cracks.
- 2. The visual inspection shall cover the areas of wall surfaces up to ten (10) ft. from the top of basemat El. -35.0 ft.
- 3. Location maps shall be prepared to record the results of the inspection. These maps shall be elevation views of the wall with cracks drawn on them to scale location.
- 4. Each location map shall include items as follows:
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- a. Date l
i b. Inspector's name
- c. Checker's name
- d. Crack locations - end points and approximate paths
- e. Repair evidence
. f. Seepage indication 9 Dimensions of areas covered by leachate l h. If the crack is extended down to mat level, the distance j
to the near-by mat cracks (not more than two (2) ft.). l
- 5. A scale composite crack map shall be developed to show the general pattern of cracks on walls and the basemat.
- 6. The basemat crack maps which had been developed by Harstead Engineering Associates shall be utilized to develop the composite crack map.
- 7. Those basemat crack maps utilized shall be up-dated to
() include newly observed cracks, if any.
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- 8. 35mm photos shall be taken for all mapped areas.
- 9. Laitance shall not be removed. -
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2 ATTACHMENT II
H E A HARSTEAD ENGINEERING ASSOCIATES o INC. 169 KINDERKAMACK ROAD PARK RIDGE, N.J. 07656
- Phone:(201)3912115 Project No. 8304 April 26, 1984 W3-HE-LD-015 Louisiana Power & Light Co.
Waterford III Nuclear Plant P.O. Box B Killona, LA 70066 Attn: Mr. T. Gerrets
Subject:
Naterford III SES Analysis of Cracks and Water Seepage in Foundation Review of Wall Cracking
References:
(1) HEA Report No. 8304-1 dated 9-13-83 (2) Ebasco Report NPIS Nall Hairline Cracks Evaluation, dated April 1984. Gentlemen: 1.0 Introduction On Tuesday Acril 17, we received a copv of an Ebasco Report, Reference 2 A memo from J.Costello attached to the subiect Report requested HEA review with subsequent not-ification to Lcuisiana Power and Light Company. Dr. A.V. ( du Bouchet of our office has reviewed the Ebasco Report in conjunction with a site visit (conducted with the assistance
'of I.Safro of Ebasco) on April 21, 1904.
2.0 Purcose The purpose of the site visit was to confirm the validity of the wall crack maps generated by Ebasco (see Appendix B of the Ebasco Report). There are a total of 28 pages of crack maps' contained in Appendix B. The location key to each of these pagos is provided in Figure 3 of the Report, which details the locations of the concrete walls mapped by Ebasco with respect to the top of the NPI9 basemat at Elev. -35.00 ft. i l
e' 3.0 Site Review The following items were specifically reviewed at the site:
- 1. Each crack map contained in Appendix B was reviewed qualitatively for accuracy and completeness.
- 2. A notation was made for any wall crack spaced closer than 2 ft. to a basemat crack at the juncture of the wall and basemat.
- 3. Additional walls not specifically mapped by Ebasco were also reviewed to confirm the validity of the Ebasco scope of work.
With respect to Item 3, a continuous circuit was established in both the NE and NW quadrants of the basemat to verify the absence of any substantial cracking in walls not mapped by Ebasco. 4.0 Evaluation The following quantitative observations with reference to HEA Report 8304-1, Reference 1 can be made in order to confirm the validity of the Items extracted from Sections 5.3 and 5.4 of the Ebasco Report:
- 1. there are a total of 146 cracks mapped by Ebasco, of which 87 are directly observable; the remaining cracks can only be inferred from the presence of leachate;
- 2. there are a total of only 19 instances in which wall and mat cracks fall within a 2.0 ft.
dimension at the base of the mat and wall;
- 3. Ebasco mapped a total of approximately 700 linear feet of wall (these dimensions were scaled directly from Ebasco Drawings LOU-1564-G-499 Sol, 2 and 3) ;
- 4. the average spacing of observable cracks is therefore (700 ft./87 cracks) or about 8 ft. on center;
- 5. the average spacing of all cracks counted is therefore (700 ft./146 cracks) or about 4.8 ft. on center;
- 6. the percentage of wall cracks interacting with basemat cracks as a function of the total number of wall cracks is therefore (19x100/14 6) ; about 13 percent, or about 1 in 8 cracks.
e If we restrict ourselves to an evaluation of the Reactor Bldg walls alone, we then note that:
- 1. there are a total of 70 cracks mapped by Ebasco, of which 29 are directly observable; the remaining cracks can only be inferred from the presence of leachate;
- 2. there are a total of only 5 instances in which wall and mat cracks fall within a 2.0 ft. dimension at the base of the mat and wall;
- 3. Ebasco mapped a total of approximately 210 linear ft. of wall;
- 4. the average spacing of observable cracks is therefore (210 ft./29 cracks) or about 7.2 ft. on center;
- 5. the average spacing of all cracks counted is therefore (210 ft./70 cracks) or about 3.0 ft. on center;
- 6. the percentage of wall cracks interacting with basemat cracks as a function of the total number of wall cracks is therefore. (5x100/70) ; about 7 percent, or about 1 in 14 cracks.
5.0 Conclusions The cracks observed in the top of the foundation mat were discussed in detail in HEA Report 8304-1, Reference 1. We concur with the observation that the wall cracks are drying shrinkage cracks which form when the wall drys but is restrained from shrinking at the intersection of walls with the foundation mat. In some cases there may have been a predispotion of these wall shrinkage cracks to emanate from a pre-existing crack in the mat. However, the cracking as observed is not consistent with any possible loading mechunism. The incidence of wall and mat crack interaction as detailed in Items 6 above is not concidered significant enough to substantiate a wall-basemat crack interaction hypothesis. We therefore concur with the key Ebasco conclusion contained in Section 5.4 of their Report which notes that: -it is concluded that a structural inter-relationship cannot be established between cracks on sur-faces of walls and basemat."
p. In summary we concur with the observations and con-clusions described of the Ebasco Report, Reference 2. If we can provide any additional information or clar-ification with respect to our review of the subject Ebasco Report, please call us. Very truly yours, HARSTEAD ENGINEERING ASSOC., INC.
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- Gunnar A. Harstead President cc. J.Costello i
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