ML102920144

5.8 Exhibit 5b Petrographic

ML102920144
Person / Time
Site:	Crystal River
Issue date:	12/08/2009
From:	MACTEC Engineering & Consulting
To:	Chris Miller Progress Energy Co, Office of Information Services
References
FOIA/PA-2010-0116
Download: ML102920144 (7)

Text

FM 5.8 Exhibit 5b Page 1 of 7 MA'CJTEC engineering and constructing a better tomorrow December 8, 2009 Mr. Craig Miller Progress Energy (352) 795-6486 ex 1026 Craig.miller@pgnmail.com

Subject:

Report of Petrographic Observations Crystal River Containment Wall and Dome Concrete Samples Steam Generator Replacement Project Crystal River Nuclear Generating Facility, Florida MACTEC Project No. 6468-09-2535

Reference:

Report of Petrographic Observations Crystal River Containment Wall and Dome Concrete Samples Steam Generator Replacement Project Crystal River Nuclear Generating Facility, Florida MACTEC Project No. 6468-09-2535 Dated November 11, 2009

Dear Mr. Miller:

MACTEC Engineering and Consulting is pleased to present this report of our petrographic observations performed on two concrete cores that were shipped to our laboratory under chain of custody. One core, Core #7 (MACTEC laboratory number 21271 A), was previously analyzed and the results were contained in our November 11, 2009 report. An additional core, identified as core #87 was received under chain of custody for petrographic analysis.

Core #87 was assigned MACTEC laboratory number 21329. It is our understanding that sample 21271A is from the containment wall near the fracture (as referenced in our November 11, 2009 report. It is our understanding that sample 21329 is from an area in the dome that was repaired several years ago. The purpose of our observations was to evaluate the similarities and/or differences in the coarse aggregate of the two samples to attempt to determine if the coarse aggregate used in sample 21329 is similar to coarse aggregate used in sample 21271A.Additionally, as requested, parameters of the air void system were evaluated for sample 21271A in general accordance with the ASTM C 457-08 Standard Test Method for Microscopial Determination of Parameters of the Air-Void System In Hardened Concrete.MACTEC Engineering and Consulting, Inc.9177 Sky Park Court, San Diego, CA 92123

• Phone: 858-278-3600

• Fax: 858-278-5300 www.mactec.com Page 1 of 7 DCN CR-017 ? ii FM 5.8 Exhibit 5b Page 2 of 7 Crjstal Rivetr Steam Generator Replacement Project December 8, 2009 Report of Petrographic Observations MACTEC Project No. 6468-09-2535 Crystal River Nuclear Generating Facility, Florida Aggregate Sample 21271A The coarse aggregate generally consisted of a natural carbonate crushed rock with a maximum size of 3/4 inch. The rocks types observed included limestone, fosiliferous limestone, and a few particles of chert and/or limestone and chert. The particles were generally angular to sub-tounded in shape and fairly evenly distributed.

The coarse aggregate appeared to comprise approximately 50% of the total aggregate quantity with the remaining fraction being fine aggregate.

The coarse aggregate had a moderate amount of void space. The limestone and fosiliferous limestone had a Mohs hardness of approximately 3.On sample 21271, there were 4 coarse aggregate pieces on the cut surface of the core that retained moisture longer than other portions of the sample. A thin section was prepared from one of these pieces and this piece contained microcrystalline quartz and radial silica and exhibited localized evidence of alkali silica reaction Sample 21329 The coarse aggregate generally consisted of a natural carbonate crushed rock with a maximum size of 3/4 inch. The rocks types observed included limestone and fosiliferous limestone.

The particles were generally angular to sub-rounded in shape and fairly evenly distributed.

The coarse aggregate appeared to comprise approximately 50% of the total aggregate quantity with the remaining fraction being fine aggregate.

The coarse aggregate had a moderate amount of void space. The limestone and fosiliferous limestone had a Moh's hardness of approximately 3.DISCUSSION Photographs comparing the features of the coarse aggregate in samples 21271A and 21329 are shown on pages 10 and 1I.The aggregates from both samples have the same general similarities.

• Both coarse aggregates have a Moh's hardness of about 3* Both coarse aggregates are a fosiliferous limestone with similar fossils a Both coarse aggregates have some particles with a moderate amount of void space 0 Both fine aggregates are predominately quartz with a similar particle shape A few limestone particles were observed in sample 21271A that contained microcrystalline quartz and radial silica (chert). Chert was not observed in sample 21329. Chert is found in association with some limestones in Florida. The material is formed by the replacement of calcium carbonate with silica that is.carried in the ground water. The lack of chert in sample 21329 does not necessarily mean that the coarse.3 Page 2 of 7 DCN CR-017 FM 5.8 Exhibit 5b Page 3 of 7 Crstal River Steam Generator Replacement Project Report of Petrographic Observations Crystal River Nuclear Generating Facility,, Florida December 8, 2009 MA CTEC Project No. 6468-09-2535 aggregate in sample 21329 is from a different source than the coarse aggregate in sample 21271A. In MACTEC's November 11, 2009 report, a petrographic analysis was performed on two samples (21271A and 21269A). It is our understanding samples 21271A and 21269A (both from the containment wall) are expected to be from the same source, however, chert was observed in sample 21271 A and was not observed in sample 21269A.It appears the coarse aggregate in both samples (21271 A and 21329) could be from the same source or from the same general geologic deposit. It cannot be said with 100% certainty that both coarse aggregate samples came from the same source, however, we didn't see indications to suggest they are from different sources..PARAMETERS OF THE AIR VOID SYSTEM The parameters of the air void system were evaluated in general accordance with the ASTM C 457-08 Standard Test Method for Microscopial Determination of Parameters of the Air-Void System In Hardened Concrete.

For this evaluation the modified point count method was utilized.In our analysis, a total of 1,667 points were counted and each point was classified as a void, paste, coarse aggregate, or fine aggregate.

Additionally, the number of voids that were traversed when going from point to point was recorded.

The results are as follows: Number Of Voids Intersected 327 Points In voids 52 Points In Paste 434 Points In Coarse Aggregate 683 Points In Fine Aggregate 498 Total Number of Points 1667 Following the calculations in ASTM C 457-08, the parameters of the air void system are as follows: Air Content = 3.1%Air content is the proportion of the total volume of the concrete that is air voids; expressed as a percentage by volume.Void Frequency

= 3.1 per inch Void frequency is the voids per unit length of traverse; the number of air voids intercepted by a traverse line divided by the length of that line; the unit is a reciprocal length.4 Page 3 of 7 DCN CR-017 FM 5.8 Exhibit 5b Page 4 of 7 A%1,MACTEC I

SUMMARY

OF PETROGRAPHIC OBSERVATIONS OFI IHARDENED CONCRETE -ASTM C-856-04I PROJECT NAME Crystal River Core Petrography Project PROJECT NUMBER 6468-09-2535 DATE SAMPLED RECEIVED 10-25-09 SAMPLE I.D. 21271A SAMPLE SIZE AND DESCRIPTION Concrete core, approximately 3 3/4 inches in AS RECEIVED diameter, approximately 7 to 8 inches long.OBSERVATIONS BY David Wilson C RACTERISTICS OBSERVATIONS' COARSE AGGREGATE:

Shape Angular to sub rounded Grading Approximately N4 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, a few with siliceous deposits Rock Types Mostly limestone and fossiliferous limestone.

4 coarse aggregate particles on the cored surface retained moisture much longer than the other particles and one of these paticles had a darkened rim Alteration:

Not observed-Degree-Products Coatings Not observed Rims Not observed except for one particle internal Cracking Generally not observed except in the vicinity of the fractured surface. One of the particles that retained moisture longer than the other particles (referenced in rock type section) was observed in thin section and contained microcrystalline quartz and Petrographic Observations, Sample I.D. 21271A Page I of4 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal npri 4 nf 7 D------- -.. .. .. .... ... ... ..... ..........

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FM 5.8 Exhibit 5b Page 5 of 7 SMACTEC radial silica (essentially chert) with the limestone, several cracks were observed going through the portion which was predominately chert. There appeared to be minor amounts of ASR gel but a positive identification could not be made due to the small amounts present.Contamination Not observed FINE AGGREGATE:

Shape Generally sub-rounded to sub-angular Grading #4 and smaller Distribution Even Texture Fine Composition Siliceous Rock Types Quartz Alteration:

Not Observed-Degree-ProductsNot Obser,,e, L Rims Not Observed I Internal Cracking A few internal "ractures were observed Contamination Not observed O CHRACTERISTICS I 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 void-Shape clustering was observed around a few-Size coarse aggregate particles.

The air void-Distribution 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 Petrographic Observations, Sample I.D. 21271A Page 2 of4 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal Pnge .Of 7-D~CN CRO-1 7~

.FM 5.8 Exhibit 5b Page 6 of 7...MACTEC

SUMMARY

OF PETROGRAPHIC OBSERVATIONS OF PROJECT NAME Crystal River Core Petrography Project, PROJECT NUMBER 6468-09-2535 DATE SAMPLED RECEIVED 11-20-09 SAMPLE I.D. 21329.SAMPLE SIZE AND DESCRIPTION Concrete core, approximately 1 3/4 inches in AS RECEIVED diameter, 2 pieces, each approximately 6 inches long.OBSERVATIONS BY David Wilson iiCHARACTERISTIC I- 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 and fossiliferous limestone.

Alteration:

Not observed-Degree-Products Coatings Not observed Rims Not observed 1 -1Wu al % Jkacking Nut ubsei ved Contamination Not observed FINE AGGREGATE:

Shape Generally sub-rounded to sub-angular Grading #4 and smaller Distribution Even Texture Fine.Composition Siliceous Rock Types Quartz Alteration:

Not Observed*Petrographic Observations, Sample I.D. 21329 Page 1 of 3 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal-------- ............................................

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DCN C R-0 17 FM 5.8 Exhibit 5b Page 7 of 7-%MACTEC Degree Products Rims Not Observed ii .A. " N1 O iere iliI ~rlVt.few intemal fiactams were-obscm IContamination Not observed IiCHRACTERISTICS

-7OBSERVATIONS 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.

Generally-Shape fairly evenly distributed

-Size-Distribution 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 Not observed Embedded Items Not observed-Shape-Size-Location-Type Alteration:

Not observed-Degree & Type-Reaction Products-Location-Identification Nature and Condition of Surface Not observed Treatments Estimated water-cement ratio (based on Appeared to have a moderately low w/c visual observations only) ratio possibly in the range of 0.4 to 0.5 Estimated cement content (based on visual Appeared to have a moderately high observations only) cement content PASTE: Color (GSA rock color chart 1991) Medium light gray Hardness Appeared moderately hard when scratched Petrographic Observations, Sample I.D. 21329 Page 2 of 3 Form Reviewed and Approved for Use on Crystal River Cores Project 6468-09-2535 J. Allan Tice, Project Principal P~nn 7 nf 7 ULIN UI--Ui t