ML102910601
| ML102910601 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/23/2009 |
| From: | MACTEC Engineering & Consulting |
| To: | Chris Miller Office of Information Services, Progress Energy Co |
| References | |
| FOIA/PA-2010-0116, 6468-09-2535 | |
| Download: ML102910601 (3) | |
Text
FM 5.8 Exhibit 5a Page 1 of 3
?rfMACTEC engineering and constructing a better tomorrow December 23, 2009 Mr. Craig Miller Progress Energy
Subject:
Report of Petrographic Observations Crystal River Containment Wall Steam Generator Replacement Project Crystal River Nuclear Generating Facility, Florida MACTEC Project 6468-09-2535 Dear Mr. Miller MACTEC Engineering and Consulting, Inc. (MACTEC) is pleased to present this report of our petrographic observations performed on a concrete chunk that was shipped to our laboratory under chain of custody. It is our understanding the chunk is from an area of the containment wall where a fracture was discovered running parallel to the surface at a depth of approximately 8 to 9 inches. We understand the submitted chunk contains the subject fractured surface and a portion of the concrete that was cast against a tendon duct.
The purpose of our work was to perform a petrographic analysis of the sample to observe the fractured surface and the surface that was cast against the tendon duct for depth of carbonation and other similarities or differences.
PETROGRAPHIC OBSERVATIONS A Petrographic Analysis is a visual and microscopic analysis of cementitous materials performed by a qualified petrographer. Petrographic examinations are typically performed on polished sections or thin sections. Polished sections are generally cut sections that have been lapped (ground flat and smooth) and polished and are observed using reflected polarized light microscopes at magnifications of up to 80X.
Thin sections are samples mounted to glass slides and ground to specific thicknesses (generally 20, 30, or 40 microns depending on the application) and observed using transmitted polarized light microscopes at magnifications of up to 600X.
A petrographic evaluation may be performed to identify and describe a specific item of interest such as the presence or extent of distress in concrete, or to provide a general characterization and measure of MACTEC Engineering and Consulting, Inc.
9177 Sky Park Court, San Diego, CA 92123 - Phone: 858-278-3600 - Fax: 858-278-5300 www.mactec.com
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SUMMARY
OF PETROGRAPHIC OBSER VA TIONS OF HARDENED CONCRETE - ASTM C-856-04 I PROJECT NAME Crystal River Core Petrography Project PROJECT NUMBER 6468-09-2535 DATE SAMPLED RECEIVED 12-2-09 SAMPLE I.D.
21378 SAMPLE SIZE AND DESCRIPTION Chunk of Concrete identified as "small AS RECEIVED piece adjacent to sleeve". The chunk has a section that appears to have been cast against a tendon duct and reportedly has a section of the subject fractured surface adjacent to the surface cast against the duct.
OBSERVATIONS BY David Wilson CHARACTERISTICS OBSERVATIONS COARSE AGGREGATE:
Shape Angular to sub rounded Grading Approximately 3/4 maximum size Distribution Even. Approximately 50% of the aggregates appeared to be coarse aggregates with the remaining fraction being the fine aggregate.
Texture Fine Composition Carbonate Rock Types Limestone, fossiliferous limestone Alteration:
Not observed Degree Products Coatings Not observed L
Rims JNot observed
]
Internal Cracking Generally not observed except in the vicinity of the fractured surface.
Contamination Not observed FINE AGGREGATE:
Shape Generally sub-rounded to sub-angular Grading
- 4 and smaller Petrographic Observations, Sample I.D. 21378 Page I of 4 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal
II FM 59 Fxhihit 5a Paae 3 of 3 4MACTEC Distribution Even Texture Fine Composition Siliceous Rock Types Quartz Alteration:
Not Observed Degree Products Coatings Not Obssrved E Rims Not Observed Internal Cracking A few internal fractures were observed Contamination Not observed ICHARACTERISTICS OBSERVATIONS CONCRETE:
Air-Entrained or Not Appeared to have some air entrainment. Total air content based on visual observations appeared to be 2 to 3%
Air Voids:
Mostly small and spherical. Some air Shape void clustering was observed around a Size few coarse aggregate particles. The Distribution air void distribution was moderately un-even, some small areas lacked air entrainment. There was some limited mineral growth observed in some of the air voids. Calcium hydroxide was observed lining some air voids.
Bleeding Not Observed Segregation Not Observed Aggregate-Paste Bond Coarse and fine aggregates appeared to have a good bond to the cement paste with few openings. Some aggregate particles had increased calcium hydroxide in the paste surrounding the perimeter of the particle.
Fractures One long hairline crack was observed and is shown in the attached photograph #6.
Some minor fractures were observed near the portion that was cast against the duct and the portion that contained the fractured surface.
Embedded Items Not observed Shape Petrographic Observations, Sample LD. 21378 Page 2 of 4 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal