ML091400470

IR 0553792-02, Drywell Structural Integrity Basis from 1R21 Inspections

ML091400470
Person / Time
Site:	Oyster Creek
Issue date:	04/17/2009
From:	- No Known Affiliation
To:	Office of Information Services
References
FOIA/PA-2009-0070
Download: ML091400470 (29)

Text

IR 0553792-02, Drywell Structural Integrity Basis from 1R21 Inspections Reasons for Evaluation/Scope The purpose of this .Technical Evaluation is to present current and projected (until 1R22) margin in Drywell Vessel Thicknesses and the bases to further confirm that the drywell structural integrity continues to maintain design basis requirements as established in references 1 through 3. The intent of this evaluation is to demonstrate that the Drywell Vessel thicknesses are adequate to satisfy current licensing and design bases requirements.

This Technical Evaluation was developed in accordance with CC-AA-309-101, Revision 7.

A prejob brief for this Technical Evaluation was performed by Howie Ray in accordance with HU-AA-1212 Rev 1. The risk rank of this Technical Evaluation was concluded to be a "4", since the acceptance criteria have already been established and approved through existing design analysis.

Therefore a third party review is not required.

Background

In the 1R21 Outage a series of UT thickness measurements were performed of various elevations of the Drywell Vessel in accordance with specification OC-IS -328277-004. The purpose of these UT inspections is to measure corrosion rates of the Drywell Vessel and further confirm that the vessel meets the design basis.

This is accomplished by inspecting the same locations over time.

In the mid 1980's a survey was performed of the Drywell Vessel at the Sandbed elevation (11' 3").

As a minimum at least one inspection location (also referred to as a grid) was selected in each of the 10 Drywelf Bays and permanently marked. These were then selected for repeat inspection and entered into the Drywell Thickness Monitoring Program.

UT Inspection of locations with the most thinning consisted of obtaining 49 individual UT thickness readings in a 7 by 7 pattern spaced on 1 inch centers. These measurements were taken using a stainless steel template. The template was designed to ensure that the 7 by 7 grid is located in the same area with repeatability of a 1/16".

The program then performed UT inspections over time at these same locations from 1987 to 1996.

The corrosion rates were developed using a standard regression analysis and establishment of the.

9 5 % confidence intervals to capture increasing variance depending on the projection of ongoing corrosion and the number of inspections. This methodology is based on the following references:

1) Applied Regression Analysis, Second Edition, N.R. Draper & H. Smith, John Wiley and Sons 1981

2) Statistical Concept and Methods, G.K. Bhattacharyya & R.A. Johnson, John Wiley and Sons 1977, IR 553792 Assignment 02

3)' Experimental Statistics, Mary Gobbons Natrella, John Wiley and Sons 1966 (Reprint, National Bureau of Standards Handbook 91)

4) Fundamental Concepts in the Design of Experiments, Charles C Hicks, Saunders College Publishing, Fort Worth, 1982 .

Each time UT inspections are perfor-med the distribution of the individual readings is checked to confirm the original distribution evaluation.

Inspections of the Drywell above the sandbed have been performed up to 2006. Corrosion rates have been calculated in calculation C-1302-187-E310-037 Revision 2 and ECR 05-00575.

Corrosion in the sand bed region was addressed by removing sand, water, and corrosion byproduct in the sandbed and applying a coating on the exterior of the vessel in 1992.

Comparison of UT inspections performed in 1992 and 1994 as documented in C-1302-187-5300-030 shows that the sandbed region continues to meet design basis requirements.

This Technical Evaluation will compare the 2006 UT inspection data to these earlier calculations to further confirm conclusion that the drywell vessel continues to meet design basis.

Detailed Evaluation Methodology C-1302-187-E310-037 Revision 2 and C-1302-187-5300-030 identify the locations whichare the most critical with respect to thinning (see table 1). These are located at five different elevations 11' 3, 50' 2", 51' 10", 60' 10", and 87' 5".

These calculations developed corrosion rkte projections for these critical locations. The mean of the 2006 inspection of the same critical locations plotted on the earlier projections to determine if those projections are still valid and bound the current inspection results.

Elevation 11' 3 Refer to the data in attachment 3 and the projection curve for location 19A in attachment 2.

Calculation C-1302-187-5300-030 identified location 19A as the most critical since it was the thinnest area in the sandbed. However the calculation concluded with 95% confidence that this location and the other sandbed region locations were not experiencing corrosion. Figure 1 provides a trend of the mean values for!this location. Figure 1 also provides curves showing the calculated standard error of plus or minus 0.0034 inches for the means. The 2006 mean is also plotted on figure 1 and shows that this value is well within the standard error band.

Table I provides a breakdown of the mean thickness measured in 2006 and associated current margin.

IR 553792 Assignment 02 2

Elevation 50' 2" Refer to the data in attachment 3 and the projection curves for locations 5-5 and 13-23 in attachment 2.

The 2004 calculation identified locations 5-5HI and 15-23HI as the most critical since they were the thinnest at this elevation. The calculation concluded that these locations are experiencing corrosion rates of 0.0003 and 0.0004 inches per year with 95% confidence. Figure 2 and Figure 3 provide trends of the means of data collected from 1987 through 2004 for these locations taken '

from calculation C-1302-187-E310-037 Revision 2. The 2006 means for each location are plotted on these figures. These show that the 2006 means are consistent with and are bounded by the 2004 projections. Therefore the margins and projections from 2004 remain valid and bounding. Table 1 provides the means and margin calculated in 2004.

t Table I provides a breakdown of the mean thickness measured in 2004 and associated current margin for these two locations.

Elevation 51' 10" Refer to the data in attachment 3 and the projection curve for location 13-32 in attachment 2.

The 2004 calculation identified location 13-32 as the most "critical since it was the thinnest at this elevation. However the calculation concluded with 95% confidence that the location was not experiencing corrosion. Figure 4 provides a trend of the means of data collected from 1987 through 2004 for this location taken from calculation C-1302-187-E310-037 Revision 2. The 2006 mean for this location is plotted on this figure. Figure 4 also provides curves showing the 2004 calculated standard error of-/+ 0.0053 inches for the data from 1987 to 2004. The 2006 mean is well within the 2004 standard error band.

This shows that the 2006 mean is consistent with and bounded by the 2004 projection, which concluded that this location is not corroding. Therefore the margin and projection from 2004 remains valid and bounding. Table I provides the means and margin calculated in 2004.

Table I provides a breakdown of the mean thickness measured in 2004 and associated current margin.

Elevation 60' ' 10" Refer to the data in attachment 3 and the projection curve for location 5-22 in attachment 2.

The 2004 calculation identified location 5-22 as the most critical since it was the thinnest at this elevation. However the calculation concluded with 95% confidence that the location was not experiencing corrosion. Figure 5 provides a trend of the means of data collected from 1992 through 2004 for these locations taken from calculation C-1302-187-E310-037 Revision 2. The IR 553792 Assignment 02 3

2006 mean for this location is plotted on this figure and shows that this value has virtually not changed since 2004.

Figure 4 9lso provides curves showing the 2004 calculated standard error of the data from 1987 to 2004. The 2006 mean is well within the 2004 standard error band.

Table 1 provides a breakdown of the mean thickness measured in 2004 and associated current margin Elevation 87' 5" Refer to the data in attachment 3 and the projection curve for location 9-20 in attachment 2.

The 2004 calculation identified location 9-20 as the most critical since it was the thinnest at this elevation. The calculation concluded that this location was experiencing a corrosion rate of 0.00075 inches per year with 95% confidence. Figure 6 provides the trend of the means of data collected from '1987 through 2004 for these locations taken from calculation C- 1302-187-E3 10-037 Revision 2. The 2006 mean for this location is plotted on this figure. This shows that the 2006 mean is consistent with and is bounded by the 2004 projection. Therefore the margin and projection from 2004 remain valid and bounding. Table 1 provides the means and margin calculated in 2004.

Table I in attachment 1 provides a breakdown of the mean thickness measured in 2004 and associated current margin for these two locations.

Bay 15 Grid at Elevation 71' 6" In 1R21 Oyster Creek performed first time inspections of two 6" by 6" areas above the transition weld at elevation 71' 6". The results of the 6" by 6" area in bay 15 showed several local readings less than the inspection specification acceptance criteria (ref. 4). The intent of the criteria in the specification was to provide a low threshold for inspection results so that unexpected readings would be evaluated. As a result IR 00556049 was issued. Review of the inspection results showed that the thinnest local reading was 0.449 inches.

The inspection specification criteria were purposefully set well above the design basis criteria. The minimum required design basis local thickness for this elevation is 0.300 inches (reference 2).

Therefore the as found thickness at this location meets the design basis requirements. In addition even when assuming a 1 mil per year corrosion rate, this location will continue to meet design basis until well past 2008. Comparison of this new location to an existing monitored location that has been determined to be the most critical for the plates at this elevation (location 9-20) shows that the projections for the previously monitored location are bounding (refer to attachment 3 page 11).

Bay 17 Grid at Elevation 23' 76" In 1R21 Oyster Creek performed first time inspections of two 6" by 6" areas above the transition weld at elevation 23' 6". The results of the 6" by 6" area in bay 17 showed several local readings IR 553792 Assignment 02 4

4.

less than the inspection specification acceptance criteria (ref. 4). The intent of the criteria in the specification was to provide a low threshold for the inspection results so that unexpected readings would be evaluated. As a result IR 00548459 was issued. Review of the inspection results showed that the thinnest local reading was 0.628 inches.

The inspection specification criteria were purposefully set well above the design basis criteria. The minimum required design basis local thickness for this elevation is 0.360 inches (reference 2).

Therefore the as found thickness at this location meets the design basis requirements. In addition even when assuming a 1 mil per year corrosion rate, this location will continue to meet design basis until well past 2008. Comparison of this new location to an existing monitored location that has been detennined to be the most critical for the plates at this elevation (location 15-23) shows that the projections for the previously monitored location are bounding (refer to attachment 3.page 14).

Conclusions Table 1 demonstrates that current and projected margin in critical Drywell Vessel locations based on the comparison of recenily obtained 2006 UT data and previously approved calculations remain adequate to continue to satisfy design bases requirements until 1R22. Comparison of the 2006 data to previously approved calculations, demonstrates that the conclusions in the previous calculations are still bounding the current data.

References

1) C-1302-187-E310-037 Revision 1

2) ECR 05-00575

3) C-1302-187-5300-030 Revision 1

4) Specification IS-328227-004 Rev. 13 Attachments

1) Margin Table - 1 page

2) Review of 2006 means value to previous projections - 6 pages

3) Drywell UT Inspection Data - 16 pages IR 553792 Assignment 02 5

-a Summary of Oyster Creek Drywell Corrosion Monitoring Program Controlling Locations Elevation/ Location Measur When Criteria Margin Percent Measured .-Preliminary Reference.

Plate with ement in 2006 Corrosion Projected (Nominal Mean (inches) Rate. - margin in Thickness thinnest 2029 based Inches) Inches/ on 95%

year confidence interval around the corrosion rate 11'3, 19A 0.8066 10/2006. 0.73.6 0.0706 9.6% None 9.6% C-1302-187-5300-030 (1.154")

• 50' 2" Bay 5 0.7556 10/2004 0.541 0.2146 39.7% 0.0003 36.5% C-1302-187-Location E310-037 Rev (0.770") 5-HI 2 50' 2" Bay 15. 0.7573 10/2004 0.541 0.2163 40% 0.0004 36.4% C-1302-187-Location E310-037 Rev (0.770") 23-HI .... _2 51 10" Bay 13 0.6872 10/2004 0.518 0.1692 32.7% None 32.7% C-1302-187-Location E310-037 Rev (0.772' 32 Lo 2 60' 10" Bay 5 0.6928 10/2004 0.518 0.1748 33.7% None 33.7% C-1302-187-Location E310-037 Rev (0.722") 22 __2 87 '5" Bay 9 0.6123 10/2004 0.452 0.1603 35.4% 0.00075 33.6% C-1302-187-location E310-037 Rev (0.640") 20 - 2

ý_R' CA4-4 I Q5 4~(. f

Prepared by Pete Tamburro I have performed an independent technical review of this technical evaluation in accordance with Section 4.3 of CC-AA-309-101, Revision 7. I have confirmed the correctness of the inputs, mathematics, and outputs. I have verified the methodology and compliance with design bases criteria are appropriate. The results accomplish the stated purpose.

Independent Review By Frank Stulb Date: 11/06/06 Manager Comments:

This technical evaluation was prepared and reviewed by qualified personnel to provide a summary of the 1R21 Drywell Inspection results performed in 2006. The conclusions demonstrate that the structural"integrity of the drywell shell, based on its measured thickness at representative locations, remains acceptable based on the previously approved methodologies and acceptance criteria.

Approved for Use: Ray, F.H. 11/6/2006.

IR 553792 Assignment 02 6

AmerGen Calculation Sheet Appendix 10 System No. Sheet No.

Subject:

Calc. No. Rev. No.  % 187 11 of 15 Drywell Corrosion C-1301-187-E310-InAftOff5O73 Lf (

F MSR MSE L~VV\ ~~-)'~ 02.

F actaul a :=0.05 F.critical := qF( 1 - a, DegreeFree reg, DegreeFree ss) QC~e of F actaul

-F ctal F ratio F critical F ratio= 1.715"10-3 Therefore the curve fit of the means does not have a slope and the grandmean is an accurate measure of the thickness at this location i := 0.. Total means I igrand measured: mean(ui measured) rgrand measured agrand measured: Stdev (9 measured)

GrandStandard To r°Ttal means The minimum required thickness at this elevation is Tminjgen SB. :=736 (Ref. Calc. SE-000243-002)

Plot of the grand mean and the actual means over time 840 I

820 xX 11measured XXX pgrand measured 800 Tmin.gen SB medown 780 09 meup w.03(

760 6:0I '

740 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 Dates

AmerGen Calculation Sheet Appendix 2 Bay 5.Area 5

Subject:

Sheet No.

Drywell Corrosion A2- 27 of 32 upperf:= Thick predictf (year predictf Thick actualman) 2

+qt I Total means lower' :=Thick predict, at Total ear predict - Thick actualm

+ - qt I - ,Total means- 2 Standard erro r 1 .- (m )

2 (d-I- I) sum General area Tmin for this elevation .in the Dryweil Tmin-gen 51  :=541 (Ref. Caic. SE-000243-002) f m = 0.246 IIIII I I I max(upper)+30 K 0c,.oo sr-rA*,7, 750 Thick predict 700-upper lower 650 "-

I measured Tmin..gen 51 743 00 600 -

550 min (Tmin..gen 51) - 30 I. I I 1985 1990 1995 2000 2005 2010 2015 2020 2025 21030 1..985-10 3 Year predict, year predict, Year predict, Dates, year predict, 2006.8 2.029.103

/ Ooi33 75. -o-t A_ a Qcj.~Of 6

AmerGenl Calculation Sheet Appendix 4 Bay 15 Area 23

Subject:

Calc. No. System No. Sheet No.

Drywell Corrosion C-1301-187-E310-037 187 A4- 28 of 32 Coo ý-S3 '92. -L For the thicker points (2 ec)e=3 of upperf: Thick highpredictf Ivear.. - Thick2 1 pIU~pLuLectf -- ctualmean)

+ qt I t, Total means 2) -Standrd+ (d-+1) sum i2 lowerf : Thick highpredictf ...

t Total means-2 .Standard higherror 1... (year predictf- Thick actualmean I+

(d+ 1) sum j m hijh = -0.418 5~ 3 Thick highpredict p9 high measured lower upper Tmin.gen 51 760 00 1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 Year predi, Dates,year predict,Year predictYear predict,2006.8

AmerGen Calculation Sheet Appendix 5 Bay 13 Area 32

Subject:

Drywell Corrosion Standard error*K mean(olow measured) = 5.291 FTotal means mean(alow measured) ag medown :j lowhgrand measured - ________measured) 5/Total means,

" . ~mean(alow,measured) og meup =ilowhgrand measured T oal meas JTotal means

~Loe.c fc,, 13- 13 700 I 695 690 glaow measured xXX plowhgrand measured

__ X 685 a' medown X

.X

• 9 meup m m fzG~nX 1990 1995 2000 2005 Dates

AmnerGen Calculation Sheet Appendix 6 Bay I Area 50-22

Subject:

Calc. No. Rev. No ystem No. Sheet No.

Drywell Corrosion C-1 301-187-E31 0-037 187 A6- 12 of 16 2-0 o 3 -2,c,'2

• QC)Q~ f ~ f Standard error mean(o measured) -11.865

ýTotal means'

-mean (ameasured) og medown :igrand measured

/Total means g9meup :=pgrand measured tmean(a measured) gTotal means

,7,)n I SOII L zo C X ~ ~ 2tZO 710 measured x X 4 e-xxx 700t-11grand measured 0

g medown 690 x

0g meup 680 I-

• Tll I I I I I I I I 1994 .1996 1998 2000 2002 2004 2006 2008 Dates

AmerGen Calculation Sheet Appendix 7 Bay 9 Area 20

Subject:

- System No. Sheet No.

Drywell Corrosion 187 A7- 23 of 23, The minimum req Calc. SE-000243-002) m s = -0.754 Location Curve Fit Projected to Plant End Of Life 650 I I I I I I I I 600 I

Thick predict upper 550 F-lower I' measured Tmin-sen 86 7170 500o-450 C

422 1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 Year predict, Year predict, Year predict, Dates, year predict, 2006.8 2030 1.985.103 year predict = 2.0099103 Thickpredict1 2 = 604.115 Therefore the regression model shows that even at the lower 95% confidence band this location will not corrode to below Drywell Vessel Minimum required thickness by the plant end of life.

No Pits have been identified for this location (o 3-('COG.

.y3-79 -9

(It PErofrf W %PZ%LV.'-001- P5 oS General Electric File Name: WA ter cree ii _"Ultrasonic Thickness Measurement Date: 1018/2006 I M Data Sheet UT Procedure: .R-AA-335-004 Refueling Outage -

PanA I f 5] Specific~ation: IS1-328227-004 Examiner. Matt Wilson Level: I1 Instrument Type: Panametrics 37DL Plus Examiner: Leslie Richter

• Level: II Instrument No: 031125409 Transducer Type: DV 506 Seial t 072561 Size: 0.438" Freq: 5 Mhz Angle:

'_196200" Soundsfe Batch No .:

Type: Panametrics Length: 5' Coupla nt Transducer CableType: CIS Step Wedge Calibration Block Block Number1 CAL-STEP-088 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks Final Cal. Time, Coarse Range: 2.0" I 0100 See Data See Data 14:32 Coarse Delay. N/A Calibrated Sweep Range = 0.300" Inches to 1.500" Inches Delay Calibt N/A Thrmometer 246647 Comp.  : 72": Block Temp, 81" Range Calib: N/A W/O Number R2090917 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 67db 254 m Internal UT Inspectlon.L DampIngA. WA N/A, , "- D E VA F ".

Reject: B C .*I N/A Template aligned toVStamps.

N/A A 'I 3-2 12 ) F ITO 0 0"0 0 s- 37'" 2 -0 2 - Thickness readings taken at holes 2 010 0 0 located in template.

40 40 0O0 0 0 Location ID9

• Bay 9 Elev. 113" 0 ,0 0 0 0 1- B -' D E F " 000 00 O 0 1 1-005! 10-' 0.986 1.133 1.132 1.136 1.1017Q 00 0

.2 . 6.--- 27 1.067 1.037 0.974 1.077 1.069e jij 0 "0;0 0 0 3 F606.75j 0.883 0.975 1.071 1.033 1.105 1.123 A,___-I__-__

4 0.993 0.949 0.984 0.995 1.022 1.041 5 0.980 0.968 0.936 0.942 0.880 0M927 0.998 al iration Chek: 10:15 6 0.960 0.869 0.976 0.987 0.967 0.965 0.949 Tscr, AV _ "

7 0.968 0.967 0.963 1.004 0.947 0.892 0.943 .6 (0.98 EocationiID B6V 1 Elev. 11 COMMENTS: .

A B C D E F C C05. WM4130& jlocatedatC04.

1 0.905 0.832 0.829 0.803 0.830 0.812 0.737 at

2. 0.797 30.20 0.825 0.834

_*._*,0.888 0.822 0.731 0.895 0.782 0.79586 0.783 -'0:71 M:O 4 0.739 1 7,0.806 o -0.821 0.890 5 08.43 *1600) 4 O8, 0.879 0.854 0.817o Cec: 0 6 0.741 8 0.890 0.907 0.3 0.810 0.826-0.842 v I 7 0.875-. 0.89 0.92D 0.886 0.871

-" -A 42

-,Ug .62 COMMENTS: File Specific Comments located to right of readings.

Location ID 1 IC: The following template holes were painted onto the plate using the template. The readings were then taken with the template removed. This was done due to the Drywell Vent Attachment weld obstructing the template. Row 1 A through G, Row 2 A through C, Row 7 C through D.

-U Reviewed by. Lee Stone 4J,,_ Level Level 11 II Date Date 10/18/2606.'

10/18/2006

I R11 LA- 00 1 P5 z cir C,

• ~

Thickness M easur ement aml KA I

General Electric -

nDae: IOil Wr2008 Oyster Creek UT Procedure: ER-AA-335-004 Refueling Oultage - 1R21 Data Sheet IS-3227-O04 Gd Procd r Page 2 of. 5 11C Bay 111 Elev. V3" Calibration Check: 10:46 1 Location ID G COMMENTS: Ao0 obstrued duo to D.W

.A/

.__ _D_ _

F 0.912 * .767* 0.858 0.886 Vent attnc weld. B01 eadIn taken adjacent to I1 OBST. 0.771 0.803 0.984 1.094 1.118 1.029 D.W. aftadmeritWWd.

2 1.056 1.046 1.002 0.935 0.942 0.888 0.853 Se. Comments abow.

3 1.073 1.113 0.836 0.790 0.874 0.834 0.846 0.838 4 0.837 0.825 0.869 0.889 0.833 0.866 0.875 5 5 0.850 I 0.572 I0.876 0.844 Tscr. IAVWL 0.829 a 0.856 0.840 710.8611 0.8B77 1.0.8'79 10-885 0U.864 1 0.880 j0.849 10.876 I .62808 a ~

11* 3" ICal lb

-In heckrl:02 I ,,A BaY I13 IElev.

Location IU1 .. ....

1 Ele I.

A 1 (;; D E . F 0; 1 0.887 0.833 0.887 0.908 1.04,- 0.961 0.922 5*~37~2- Qt 0.883 0.774 0.826 0.897 0.870 0.783 I I 2 0.823 0.798 0.823 0.746 0.769 0.768 3 0.760- 0.913 0:898 0.876 0.848 0.78.8 0.799 0.852 4 0.848 0.869 0.798 I0.848 0-B4a 5 0.8801 0.811 1 0.861 jI 810.896 0.924 0.824

_ 1( 0.785 0870- Tj ou:

6 0816 0.8131 0.869 01 o 4 0.763 0.838 0.895 0.885j 0.863 .20 7

13D Bay T 13 Eley. 11 Callbraaon Check:

LocationlD -

A B C D E- F G 1.117 1.132 1.083 1.068 1.106 1.119 1 1.114 1.041 0.999 1.061 1.007 1.117 1.100 2 0.950 0.950 0.837 0.833 0.949 1.088 1.085 3 0.986 0.977 0.878 0.851 0.911 0.958 0.997 4 1.005 0.907 0.874 0.874 0.915 0.916 0.905 5 0.960 Tscr AV.

0.947 0.897 0.887 0.920 0.865 0.8921 6 0.944 .- 25, 0.939 0.929 0.968 0.944 0.832 0.821 7 0.996 Bay 15 Eley. Ill'r Ca lbra1on Ch Location -t -

B C 0 E F G A

1.133 1.133 1.141 1.148 1.145 1.144 1 1.133 1.109 1.087 1.142 1.129 1.119 1.131 2 1.094 1:02 1.043 1.081 1.095 1.085 1.0906 3 1.0401.

0.948 T0497 1.029 1.030 1.096 1.068 4 0.978 0.969 0.977 1.069 1.013 1.067 1.041 5 0;976 AVG.

1.0311.037 1.017 1.059 1.051 Tscr.

6 0.930 0.979 0.9968* 1.031 1.006 1.033 1.052 .620 7 0.922 0.972 17 Eley. 111 3 " Calibration ch 1 Location 1 17A Bay SA B CF G 1.149 1.164 1.138 1.130 1.170 1.169 1 1.110 1.159 1.114 1.14 1.134 1.148 1.123 2 1.121 1.073 1.111 1.114 1.094 1.083 1.053 3 1.068 0.991 0.980 1.030 ."0 0.99 0.9560 4 0.976 0.926 0.909 0.950 0.869 0.938 0.967 5 0.962 AVG.

0.891 10.835 0.802 0.950 0.963 Tscr.

6 0.9031 0.956 0

.877 0.890 0.875, 0.891 0.948 .623 7 0.964 0.972 P

S Examined by Matt Wilson Examined by Leslie Richter Ad,~L Level Level U

II Date Date 10/18/2006 10118/2006 Level II Date 10/18/2006 Reviewed by: Lee Stone ,4L. ~-

I.

"L,

~eI U C-001oI 3 oir-File Name:I WA General Electric Oyster Creek

] Ultrasonic Thickness Measurement UT Procedure:

Date:l 10/18/2000 ER-M-335-DO4 Refueling Outag - I R21 .1 Data Sheet

/ Speciqation: 18-328227-004 Pa" 3 of k5 _L.

i

~1~ .f -~ I -.....-

I~ - -~

Elev. 11"3" Calilration ?!Neck: '11:bU 1 LOcation IMl I .-

17D, Bay 17

-- .. .- - . -" ' -- I -- ' " .

A Af I ~ - 1) E= F IJi COMMENTS:

0.861 0.894 0.930 0.888 0.702 Cor plug located at A03, A94rnd B03, 04.

2 I 0.49 0.828 Jo~eo6J0.802,I 0.717 0.806 0.736 0.766 0.648

• 7E-7*

2o.702o726 73 - -0 O 674, -I!

-07r42 0.8`12 0.8`12 0.803 0O.79f~

4 0.856 0-869 R f.814 I 0.041 "1 0.8550 0.816 0.852 0.846 0.888 0.856 0.800 Tscr. AVG.I 6 0.792 _0.829 0.888 1 0.837 0.887 0.8911 0.935' 1 88.63I .028 7 I0.824 0.897 17111W Bav I 17 Elev 11 3" uaiiDration i.diOcK: 12:12 I Location ID Calibratio n. ..........

I

-" '- I

..... n- w I- I., U I E= Sp U 55-373,7 2 -

A

• 1____ , 0.9691 0.962 - o0.945- 0.931 10.96 , 0.960 0.928 01L 2

3 0.972 0.977.

0.974 0.959' 0.959 1.004 0.963, 0.991 0.987 0.974

_0.98 0.967 0.982 0.993 0.965 0.996 0.985 0.937 0.924 0.952 1qtf 03

4. .....

.0.962 I 091 0.950 0.343 0.982 0.501 5 I 0.9tU i ~ 0.901Z

~L~E AVU. I

= - 96 0.994 0 .952 0.929 0.917 0.962 1.001 I S 1 1.001 I I - - - -- -_l I"i IVA i Bay I . 19 I Flay 14' ~' I Calibration Ch.ek~ I2~2R1 Ln,£tlztin ID I

• I 9A Bay 19 Elev lie 3" Calibration Check: 12:26 Location ID I v I _ l_ I* r- 'U COMMENTS: .1 J*

0.648 io-699,0 0.736 0.747 0.724 0.702 0.735 0.773 core Plug located at 04 , and C_, c05

.2__ _ ;807 6s2-i 0.774.0.788 0.845 0.743

-J I 4 0o.91__

813 6"0".8831ý 0.812 0. 0.808 .0.777 0.861 0.792 0.6 0.806 10 782 173 0_873 I O.904( I' D.542~JK1 160 I-O:801 .80 I AVG. I

. 0873 0.904 I 0.851 0.83L 0_R57 Tscr.

R I ORAA I 0.755 19~5J44-@.558

`1913 Ba 19 Ele. Calibration Check: I".2 LocatlonID 1 B C: D E IF 6

_ _ A 0.862 0872 0.932 0.947 0.992 0.802 1 0.866 0.780 0.840 0.916 0."7 0.8" 2 042 0.883 0.906 0.838 0.898 0.974, 0.930 0.3 3 0.861 4 i 0.883 0.76 0.834 0.774 5 0.811 0.770 0.786 0.788 0.799 0.731 0.778 0.891 0.934 0.834 0.736 Tecr.. I AVG. I 8 0.828 0.787 0.885

. 004 0828 .43 0875 0.871 .

7 072

-- U- - - -

- I Y

Bay I

I 13 Flait 41.f~w Calibration Ch.ek~ I2,A~I Location.lJf

• _ 1~ I IV3" Calibration Check 12:63-1 BaY 119 Elev 1

Locatl r. 'U

! &'I W I v' U'

'COMMENTS:.

1.069 0.968 0.9611 0.920 Core Plug located at G 04 F03 1 0.8091 0.768 -0.8621 2 Io:679'p0.745 0.695 10 I81 M -f L Tn*. -- 0.e5 obstructed due to surfaceb 0.870 0 .871 0863 0.8 A41A07.taken-on-V6rtic Wald 3 11+o:: 0.776 4 0.791 P10:66 - , 1.1i.1 I I I"4. Vo. 9-s I 1=0787*- 0.796 o.81l 0.781 0.73 15- °7652,I 0.867 0.796 -1scr.

• I AVG. I 6 110.866 , 0.830 I 0.880 l10.767 1- 0.867 J 0.750 7:804-0.753 I AVQL 0.760 0.763 -1scr.

.6528 0.840 1 7 110.8011 0.794 1 0.862 1 0.841 h 0.901 '1 0.906 Examined by Matt Wilson Examined by Leslie Richter L~jZ~2i 7 Level Level II II Date Date 10/18/2006 10/1W12006 10118/2006 Reviewed by:. Lee Stone A - Level II Date I II

4. .tý I~e2ILe.do, (oc~

General Electric File Name: NIA IOysterCreek jUltrasonic Thickness Measurement Dae: 10/0

.Refue Outa e- I R21 Data Sheet UT Proceure:

Spec1ifiption:

E-M-33-oo4 IS-328227-0O4 Pope 4 of 5 Locat on- Bay I Elev. 111'3" Caliration Ceck:1

'A 1fC DIE IF G 1 0.8511 /1.166 1 1.104 1 .124 11.134 1.093 11 ____________

.628

/ L- ,\

0 ej e Locaton 13DBay 3 Elev. 11'3" Caibaton Chck:134 A' I. O IC EM D -E IF -G

1. 199 1.189 1.187 1.173 1.156 1.187 1.166 Tscr 'L AVG I .628 Location 10 1 1 Bav Elev. 11'3" Calibraton Check: 13:23 A B' C D E F G 1 11.174] 1.191 11.186 1.187 1.187 1.184 1.184 Tscr" _ _V_.

I sc.. AVG-Location Ba 7 E1ey. 11'3 Calbration *C

[ Al B IC¢I DI E IFe I Gi 11.1441 .1.147 1.14 38 1.102 1.135 1 1.116 _ TsC,. _ _V _

. Ba 9 Elev. 13" C libration Ch IA I B C D E S IF 1_ 1 I.1e8 1.619 1.162 1.169 1.159 1.15 1.130

[ 628 1.4

)*#1*_f.lf"/J -./ "*"'ef /,0 ..20-0(

Examined by Malt Wilson Level II Date 10118/2006 Examined by Leslie Richter Level II Date 10/18/2006 Reviewed by. Lee Stone Level II Date 10/18/2006

40- /1Xe52/Lt -O6 o." I-General Electric F-lie Name: MA Oyster Creek Ultrasonic Thickness Measureme -- JL aeI .10/18200 Reifn uae-IIR2i 1 Data Sheet UT Procedure: ER-AA-335-004 II "

Paoe 5 ocation ID of 5 13C Bay 13 Elev. 11'3" i Specifipation:l Calibration Check: 13:

IS-328227-004

_.Al B I C D, E IF G.

1 1.146 1.148 1.148 1.149 1.144 1.128 1.134 Tscr. I AVG.

.628 Location ID 15A Bay 16 Elev. Calibration Check:4:

] A B C D E F G 1 I1.180 1.129l 1.136 1.129 1.146 1.077 1.049 Tscr. AVG.

.628 1.121 Pe.5e S, 2C O(

Examined by Matt Wilson Level 11 Date 10/18/2006 Examined by Leslie Richter Level II Date 10/18/2006 Reviewed by: Lee Stone Level II. Date- 10/18/2006 I -

0 General Electric File Name:::

0 ter Creek Ultrasonic Thickness Measurement Daate: *orMooe efueling Outage-, 1R21 Data Sheet UT Procedure: ERW-335-004 Page 1 of 1 Specification: S-328227-004 Examiner.- Graham McNabb Level: II Instrument Tye: Panametrics 37DL Plus Examiner. N/A Level: N/A Instrument No: 031124309 Transducer Type: DV 506 Serial. 012202 Size: 0.438" 1 Freq: 5 Mhz Angrle: (r Transducer Cable Type: Panametrics Length:. 5! Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number CAL-STEP-139

.. _______ SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. rime Calibration Checks Final Cal. Time I 50" 1:00 See Data See Data 2:20 Coarse Range: . I Coarse Delay' N/A Calibrated Sweep Range a 0500" Inches to 1.000" Inches Delay Calib: NIA Thermometer 246672 Cornp. Temp: 86" Block T  : 72" Range Caflb: N/A W/O Number R2091258  :

Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

55 db Af 48.0 Internal UT Inspections.

Gain:

Damping: N/A ' _'_".

Rejec: NIA Template aligned to V Stamps. v Filter N/A A B C 0 E F Thickness readings taken at holes 1 OrO 0 0 0 0 0 located in template. 2 0 00 40 0 0 0000 0 Location ID 86-20 Bay 9 Elev. 87'6" ' 6 0 0 0 0 0.0 A AS.B D E F GI70000000 1 0.621 0.62i 0.628 0.606 0.620 0.606 0.633 AI 2 0.611 0.619 0.623 0.607 0.634 0.699 0.641 A n _ I 3 0.605 0.603 0.688 0.623 0.630 0.621 0.622 4 0.614 0.604 0.615 0.586 0.620 0.630 0.623 5 0.623 0.599 0.640 0.639 0.617 0.632 0.602 Calibration Check: 14:30

6. 0.602 0.631 0.611 0.624 0.619 0.628. 0.638 Tscr. AVG.

7 0.693 0.696 0.696 0.585 0.629 0.636 0.620 0.545 0.617

- -'s - - -,,

AeI COMMENTS: Upper Elevation Inspection Location 9/20 (8-20) 4qo*,i&L 40 Reviewed by* Lee Stone Level 11 Date 10/23/2006.

ReieedbiieeSon Lvl I ae 1/320

File Name: WA General Electric Oyster Creek Ultrasonic Thickness Measurement Date: 1/220oo8 Refuelin Outage- 1iR21 Data Sheet UT Pr!ure: _ER-A335-o04 Page 1 of 2 Specification:: IS-328227-004 Examiner: Leslie Richter Level: II Instrument Ty: e Panametrics 37DL Plus Examiner: Matt Wilson Level: II Instrument No: 031120708 Transducer Type: DV 506 " Serialt. 012202 Size: 0.438" FM: 5Mhz n Transducer CableType: Panametrics Length: 5' Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number: CAL-STEP-123 SYSTEM CALIBRATION INSTRUMENT SETTINGS* Initial Cal. Tinme Calibration Checks Final Cal. Time Coarse Range: 2.0" 14:12 See Data See Data 15:19 Coarse Delay. N/A Calibrated Sweep Range = 0.300" Inches to 1.000". Inches Delay Calb . N/A Thermometer: 246497 CorP. Tern: 86" 1BIock T.rap: 720 Range Calib: N/A W/O Number: R2091258 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

62 db 61 mr Internal UT Inspections.

Gain:

Damping: N/A..__,

R~e:N/A CD' Filter Flert: N/O NTemplate aligned to V Stamps. ,0 A .8 O 0. 0 0 0 Thickness rea*dings taken at holes "200 O O O O.

located in template.e3

• 40 000 0 0

> 400O0O0 00 Location ID 86-28 (13/28) Bay 13 Elev. 87' 5" 50 0 0 0 0-0 0 I 1 A

0.605 0.610 0.646 C D 0.642 E

0.648 F

0.644 G

0.616 60000000 70 0 0 '0 0 0: 0 2 0.634 0.642 0.649 0.650 0.624 0.639 0.622 _ ___

3 0.636 0.643 0.649 0.610 0.647 0.653 0.654 A A 4 0.607 0.637 0.636 0.563 . 0.601 0.653 0.653 1 a 5 ,0.632 0.624 0.639 0.626 0.649 0.656 0.658 Calibration Check: 14:25 6 0.597 0.640 0.639 0.656 0.652 0.640 0.654 Tscr. AVG.

0.658 0.652 0.640 0.648 0.545 1 .63N 7 0.636 0633 0.630

-i *7 r 2 o0 2.

Location ID 86-31 (15/31) Bay 16 Elev. 87' 5 A B C D E - F G c 1 0.631 0.644 0.628 0.638 0.607 0.621 0.638 2 0.655 0.642 0.640 0.631 0.647 0.638 .0.634 3 0.634 0.652 0.643 0.632 0.645 0.618 0.636 4 4 0643 0.653 0.600 0.628 0.6151 0.628 0.633 S 0.655 0.642 0.659 0.618 0.630 0.563 0.633 Calibration Check: 14:31 6 0.645 0.627 0.622 0.605 0.623 0.606 0.618 Tscr. AVG.

7 0.653 6 0.613 0.640 0.622 0.620 0.642 0.545 0.631 COMMENTS:

Readings found below the minimum acceptance criteria, see page 2 (50- 22).

m Reviewed by. Lee Stone (* Level II Date 10/23/2006

-I-- I File Name: N/A

• i1~Lsenera, Iecmnc IOyster Creek IRefuelinq Outage- 1R21 HUltrasonic Thickness MeasuremenlL Data Sheet Date:

UT Procedure:]

MA.

10.18/2006 ER-AA-335-004 7]

mE Grid Procedure: IS-328227-O04 SPage 2 of 12 111111111111111F.-

Location ID 50-22 Bay I Elev. 60' Calibration Check: 15:05

__ A B C . D E F G 1 0.685 0.711 0.679 0.682 0.681 0.668 0.707 2 03715 0.703 0.703 0.703 0.716 0.722 0.658 3 0.725 0.696 0.706 0.723 0.720 0.709 0.723 4 0.697 0.661 0.675 0.720 0.726 0.712 0.623 5 0.672 0.646 0.689 0.687 0.690 0.668 0.695 6 0.665 0.652 0.675 0.700 0.667 0.636 0.650 Tscr. AV.G A

7 0.681 0.739 0.725 0.699 0.676 0.559 0.729 .625 0.68 1 2 -at

/9i-4

.I. I Date. 10/23/2006 Examined by Leslie Richter Level II Date 10/23/2006 Examined by Matt Wilson ' Level II Date 10/23/2006 Reviewed by: Lee Stone Level II

• IC-?'oe It JR~i,2 e 00a t~j -

General Electric .,File Name: W/A ster reelk Ultrasonic Thickness Measurement Date: 10/18/2006 Refueling Outage - 1R21 Data Sheet UT Procedure: ER-AA-335-004 Page 1 of 2 Specification: 1I-328227-004 Examiner. Lee Stone C -' Level: II Instrument Type: Panametrics 37DL Plus Examiner. N/A Level: N/A Instrument No: 031125009 Transducer Type: DV 506. Serial t. 072362 Size: 0.438" Freq: 5 Mhz An le: ("

Transducer Cable Type: Panametrics Length: 5! Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge I Block Number. CAL-STEP-123 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks I FinalCal. Time

• Coarse Range: 2.0" 14:30 See Data See Data 17:50 Coarse Delay:. N/A Calibrated Sweep Range = 0.300" Inches to 1.500" Inches Delay Calib: N/A Thermometer 246534 Comp. Temp: 72 1Block Termp: 79" Range Calb: N/A W/O Number. R2091258 - * .

Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 58 db 20.2 mr~ , Internal UT Inspections.

Damping: N/A __'_ _.-_,__ _,'

Reject N/A E F G Filteri N/A Template.aligned to V Stamps. IOOA B C 00 D 0 Thickness readings taken at holes 2 t'g a located in template.

40 0 0 0 0 0 0 Location ID 61-6 Bay a Elev. 50'2" 5000 0 00 0 A S C D E F G 60 0 0 0 0 00 1 0.739 0.665 0.734 0.765 0.768 0.769 0.716 70 0 0 0 0 0 0 2 0.762 0.747 0.7568 0.748 0.774 0.772 0.716 1 s I 3 0.769 0.755 0.650 0.678 0.756 0.759 0.7568 "

4 0.739 0.761 0.690 0.660 0.704 0.766 0.772 5 0.693 0.755 0.707 0.767 0.750 0.770 0.750 Calibra on eck: 14:30 6 1 0.768 0.761 0.725 0.715 0.729 0.767 0.724 Tscr. I AVG.WL 7 0.768 0.763 0.764 0.732 0.772 0.761 0.766 0.620 0.741 Location ID 61-mD:1 Bay 5 Elev. 60' 2" COMMENTS:

A B C D E F G F4 obstructed by Core Plug hole.

1 0.763 0.726 0.762 0.737 0.749 0.760 0.746 E4 and F5 readings taken on Core Plug.

2 0.748 0.683 0.750 0.739 0.755 0.718 0.737 3 0.756 0.764 0.755 0.743 0.742 0.743 0.745 4 0.764 0.741 0.737 0.692 1.160 OBST. 0.739 5 0.757 0.758 0.756 0.745 0.734 1.160 0.736 Calibration Check: 14:

6 0.767 0.748 0.743 0.732 0.730 0.739 0.726 Tscr. AVG.

7 0.748 0.747 0.748 0.751 0.742 0.745 0.749 0.620 0.760 COMMENTS: File Specific Comments located to right of readings.

Rio b.0 -2 e t Reviewed by: Kimberly Werl Level II Date 10/1 8/2006

'-.. /

/d'2/eA'-oo.~ P5 2c~!2 rile .~arne:; I General Elecrc "UltrasonicThickness Measurement F ile Name:I Date:

WA 10/18/2006 Oyster Creek R21o 3 UT 'Procedure:I ER-*-5-OA4 Refueling Outae- 1R21 Data Sheet Grid Procedure:~ IS-328227-004 Page 2 of ]2 __"

Fe 0 Location 10 61-13 Bay 13 Elev. 50' 2" Calibration c:15:

A B c D E F G 1 0.702 .64 0.771 0.751 0.765 0.774 0.777 2 0.697 0.627 0.768 0.763 0.741 0.763 0.772 3 0.649 0.66 0.766 0.730 0.743 0.768 0.765 4 0.699 0.701 0.758 0.699 0.771 0.768 0.769 5 0.629 0.768 0.689 0.763 0.768 0.772 0.763 .

6 0.730 0.720 0.687 0.776 0.766 0.762 0.771 Tscr. AVG.

7 0.772 0.771 0.739 0.774 0.764 0.733 0.769 .620 0.740 ocation ID 62-13 Bay 13 Elev. 61'10" albraon 1heck:

15:6 A B C D E F G 1 0.713 0.712 0.716 0.712 0.698 0.709 0.705:

2 0.712 0.711 0.691 0.696 0.714 0.670 0.702 3 0.717 0.667 0.713 0.684 0.712 0.623 0.672 4 0.711 0.613 0.714 0.617 0.713 0.712 0.562 5 0.717 '0.700 0.718 0.716 0.717 0.716 0.6793 *sr Am. I Rt tI 711 O.712 0.720 0.719 0.716 0.719 0.681 Tser. r----- AVG. l 0.718 0.713 0.720 0.720 0.717 0.717 0.713 .675 0.699 Location ID 51-16 Bay 16 Elev. 60'T2- araon ec:

IAl- aw - C; D.... E F I ___ Gi

_ 0.735 0.740 0.750 0.766 1 0.55 0.731 0.72 0.767 I0.742 0.756 0.764 1 0.738 0.718 0.760

-ii. ...... 7 .. .. .7 L 0.-732. 0-760 0.7z2 0.764 0.742 0.740-0.5-7 I I L . .. - I 4 I .769 ________

0.758 0.754 0.745 0.638 0.763 0.764 0.768 54-10.769 0.753 0.736 0.769 0.759 0.672 0.745 0.741 kI "

85 0.765 0.768 0.727 0.762 0.717 I 0.702 ' 0.769 Tscr. I AVG. l 7 6 -

0.768 - -

0.766 ,

0.734 0.767

~

0.702 0.737 i 0.760 .620 10.7145 I 7

Y7 2- o eo Examined by Lee Stone . Level *11 Date 10/18/2006 Examined by N/A Level N/A Date N/A Reviewed by: Kimbery Wertl '".- T.- Level II Date 10/18/2006

AmerGen Calculation Sheet Appendix 7 Bay 9 Area 20 Subject., Calc. No. Rev. No. System No. Sheet No.

Drywell Corrosion C-1301-187-E310-037 1 187 A7- 23 of 23 -

The minimum required thickness at this elevation is Tmingen 86 :=452 (Ref, Caic. SE-000243-002)

Location Curve Fit Projected to Plant End Of Life rnS -0.754 *.II

.. n . -

650 I. ,$#fea^ of Thickprd I'll, 0 upper lower

• measured 0

Tmin-Scm S6 617 600II **

00 626 4

422 1995 2000 2005 2010 2015 2020 2025 2030 year prodict,year predict,year predict,Dates ,year pdict,2006.8,2006. 2030 year predict12 =2.009@10~ Thick predict1 2 7 604.115 Therefore the regression model shows that even at the lower 95% confidence band this location will not corrode to below Drywell Vessel Minimum required thickness by the plant end of life.

No Pits have been identified for this location

,I

• ,, /A'./e - 0 3-3 /%ý ,-

General Electric File Name:

Oyster Creek Ultrasonic Thickness Measurement lor2moos Date:

Refuelin Outa- - 121 Data Sheet UT Procedure: ER-AA335.-4 page .1 of /I3-328227-M Specification:

Examiner. Jeremy Tuttle . Level: II Instrument Type: Panametrics 37DL Plus Examiner. N/A V Level: NIA Instrument No: 031124309 Transducer Type: D7908 Seral V. 338302 Size: 0.200"1 Freq: 7.5 Mhz Angle: 0.

Transducer Cable Type: Panametrics Length: 56 Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number: CAL-STEP-123 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks Final Cal. rime I Coarse Range: 2.0"- 5.0" 3:10 See Data See Data . - 4:25 Coarse Delay: N/A Calibrated Sweep Range  : 0.500" Inches to 4.000" Inches Delay Calib: N/A Thermometer 246518 Comp. Temp: 62" 1Block Temprn 6C4 Range Callb: N/A W/O Number R2091258 I Instrument Freq. N/A Total Crew Dose Drywall Containment Vessel Thickness Examination 60-65 db 40.0 mr InternallUT Inspections.

Gain:

Damping: N/A Reject NA 71' 6"Weld Scan I a Filter. N/A -___1__________

isp .61"6666656-A a B D E F G X 1 0.634 . 7 0.650 0.667 0.637 0.578 0.690 2 0.638 0.612 0.620 0.638 0.616 0.538 0.627 4 O r~e 3 0.625 0.660 0.609 0664 0.624 0.514 0.631 Mi. 50*) 0 0 0 0 Belo 0.615 0.659 0.649 0.643 0.678 0.661 0.659 .4.49" 585 6 0.638 0.637 0.647 0.665 0.665 0.665 0.6726 yo ý 1 6 0.612 -0.639 0.645 0.628 0.593 0.633 0.628,M ' I 7 0.662, -C 49 0.618, 0.60 0.449 0.547 0.611

-l- ----- ibraton C--------

0.6"Weld Tscr.

.1 0.624 oA.BC 10 O0 0 D E.F G Avg.

LocationlO 71-15 welddn Bay 1I Elev. 71'6" '20 0 0 0 0 0 A B C E F G 3000000 "2.527 2.Z7 2.518 2.560 2.620 2.64" 3 0 0 0 020 1

2 2.536 2.529 .471 2.597 2.5665 -2.633 2.656 4 Q 0 0 0 0 3 2534 4 (f4W6 .2.613 2.662 2.527 5' 0 0 0 4 2.509 2.45 2.514 2.549 2.528 .O 0 0 0 5 2.549 2.508 2.536 2.618 2.481 2.530 2.526 60.0 0 0 0 6 2.512 2.513 4 5 1 2.548 52.53 2.489 70 0 0 0 0 00 2.601 2.530 M2.536 2.533 2.515 45" 2.4-33s

-rat- e

.. .*.. zr,4 2.530 Max. 2.658T

• Avg.

COMMENTS:

Forty nine (49) readings were taken using the 8"x 8" template to determine the average reading.

A 100% scan within the 8"x 8" area to determine the minimum and the maximum thickness.

A scan of the uppermost 1" of horizonal weld was performed, the minimum reading on the weld was 0.700" the maximum reading on the weld was 0.893". Unable to obtain readings on the lower part of weld due to rough and non-parallel surfaces.

kspection area centered 13" right of vertical seam weld between plate 71-1 and plate 71-2, looking outward. Reference Rawing 2E-187-29-001 RO.

7e1.L i- lo -z7-o Reviewed by: Lee Stone Level II Date 10/26/2006

/,~,t,'034 4ýAS c General Electric File Name:

ter Creek Ultrasonic Thickness Measurement Date: 10/2612oo6 efuel* n e- _DataSheet ... UT Procedure: ER-AA-335-04 page Iof' Specification: is-3282,7-004 Examiner Jeremr Tuttsle &, f 7,Al I Level: ,I 1Instrument Tpe : Panametrics 37DL Plus Level: N/A Instrument No: 031124309 Examiner: N/A ,

Transducer Type: D7908 ISenal 9 338302 1 Size: 0.200".1 Freq: 7.5 Mhz Angle: C?

Transducer Cable Type: Panametrics Length:. 5' lCouplant Soundsafe Batch No: " _ _19620 Calibration Block Type: C/S Step Wedge -BlockNumber: CAL-STEP-123 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial CaL T**e Calibration Checks I Final Cal. Time.

Coarse Rahge: 2.0" - 5.0" 5:01 See data see data 5:48 Coarse Delay: N/A Calibrated Sweep Range = . 0.50r" Inches to 4.000" Inches Delay Cal: NIAb Thrmometer 246518 Comp. Temr: 62' Block Ternp: 64' Range'Calib: 'N/A W/O Number: R2091258 I Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel ThIckness Examination.

Gain: 60-65 db 40.0 mr Internal UT Inspectios..

Damping: N/A 71' 6" Weld Scan a I Reject N/A 0 0 0 0 Filter: N/A 0.554 *1 20 0 -0 dUP Ba o 19 Elev. 71w6" 6 Location ID 1-19w A B C D E F G 1 0.6241 0.621 0.632 0.638 0.601 0.621 0.639 2 0.6.411 0.648 0.620 0.636 0.591 0.626 0.613 40 0 01* .

3 0.633 0.634 0635 0.631 0.643 0.606 0.641 Max. 50 0.639 0.644 0.617 0.605 0.629 0.554 4 0.6171 0.645 0.656 0.663 0.628 0.690 60 0 0.0 0 0 0 55 0.635 0.641 6 0.644 0.612 0.62 0.642 0.626 0.598 0.622 70 O O

-7 0.68

- - 0.6221 0.61

- "e;7c 0.624

- o0 0.612 allraon 0.636 0.603

0o5:27

-c 6= .........--

S 5"T.3 I* *--I.6-5 0c Weld R 3.,Avg. 0.626 A B O00O C D E 00 G

_1 Location ID 71,,19weddn Bay 19 Eley. 71'6" 2 0 0 0 0 S A B C D E F a.--"* MF O O O O O O 1 2.634 2.644 2.658 2.655 2.639 2.642 2.659 2.59 2 2.64 2,641 2.637 2.670 2.654 2.651 2.654 40.0 0 0 0 0.

3 2.636 2.622. 2641 2.659 2.642 2.628 2.660 50 00 0 0 0 00 4 634 2.636 2630 2648 2.662 2.64 2.628 6 2.629 2.639 2.649 2.656 2.667 2.651 2.6960 0 0 0 0 6 2660 2.633 2.642 2.64 2.6U 2.642 2.686 70 0'0 0 0 0/0 7 2.640 2.650 2.664 2.639 2.660 2.67 2.671

- - brat 9,c: 05:25

"_r. . 2.680 6Max. 2.6 Ays. 12.648 COMMENTS:

Forty nine (49) readings were taken using the 8"x 8" template to determine the average reading.

ýA 100% scan within the 8"x 8n area to determine the minimum and the maximum thickness.

A scan of the uppermost 1" of horizonal weld was performed, the minimum reading on the weld was 0.717" the maximum reading on the weld was 0.911". Unable to obtain readings on the lower part of weld due to rough and non-parallel surfaces.

Ipspection area centered 4" left of vertical seam weld between plate 71-2 and plate 71-3, looking outward. Reference rawing 2E-187-29-001 RD.

Reviewed by: Lee Stone C

• Level II Date 10/26/2006

AmerGen Calculation Sheet Appendix 4 Bay 15 Area 23

Subject:

Calc. No. Rev. No. System No. Sheet No..

Drywell Corrosion C-1301-187-E310-037 .1 187 A4- 27 of 321

. I For the overall mean upperf Thick predictfr...

2 (year predictf- Thick 4ctualmean)

+qt I S a--,Total 2 means- 2 Standard

. *.rror

.. 1+ (d*l) sum I

[ql lowerf :=Thick predict","

-at,Ttmen l2tadadror+ I (year Thidk actualmean) 2 2

• J (d 1)

SUMI I'

General area Tmin for this elevation in the Drywell Tmin_.gen 51  :=541 (Ref. Calc. SE-000243-002) j/L2I'L'~~~=

'? SS./ =-0.777 I I I I I max(upper) +30 750 Thidc predict 700 upper lower A memurd 650

.0 Tmin.gen 51 TrA .'ei~ft actd.

758 ".0 ka'A 5 0 6001 550 I I I I I I min (Tmini.gen 51) - 30 1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 20 0 6 year predict,year predictyear predict,Daes,year predict, .8 ..2.029.103 1.985.103

0/0 9 - PI&1.F1 rime rierrue;g General Electric I FilNae I

NM

1. /.4 r

I Date: 10)23/2006 Oyster Creek Ultrasonic Thickness Measurement UT ".Procedure: ER-AA-335-004 2C-C& /*-Y//, I I--Sheet If,'-,7Ca efueling Outage 1R21 [I Date:i 1012312000

,'Spedifc-atonI IS-328227-004 ridPae I U* I; rExaminer: Jeremy Tuttle Level: II Instrument Type: Panametrics 37DL Plus Level: N/A linstrument No. 031.120708 Examiner N/A Transducer Typb: 7908 YSerial # 338302 Size: 0.200" F  : 7.5 Mhz Angle: 0" Transducer Cable Type: Panametrics Length:V 5' Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S .StepWedge Block Number. CAL-STEP-108 SYSTEM CALIBRATION INSTRUMENT SETTINGS - Initial Cal. Time n . Calibration Checks Final Cal. Time 2.0"- 5.0" 22:10 See Data See Data 23:24 '

Coarse Range:

Coarse Delay: N/A Calibrated Sweep Range = 0.500= Inches to 1.500" Inches Delay Calib: NIA Thermometer. 246518 Conmp. Temp: 52° Block Temp: 56" Range Callb: N/A W/O Number: R2091258 I Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 70 rib 22.0 mr Internal UT Inspections.

Damping: NIA 1 1/2 Blow N/A N/A 2' 66 Wel S 3

Area weldtotoe along 1/2" 740" Rej.t .ne*.. ] ru*

ZN/A l [~~below.740r, ' // ** . E Filte' Bay 17 Elev. '23' 6 0 M 0 (52 Location* IDA B weldup 23-17 1C ýD E F G2bMa 01 0.781 0.773 0.770Z 0.760 0.767 0.760 0.707 2 0.765 0.769 0.765 0.762 0.761 0.758 0.76i .40 0 0Q 0 0 3 0.761 0. 0.7 74, 0.777 0.765 0.716 0.707 i

4-0.7761 0.768 0.773 0.764 0.781 0.777 0.760 II Ne 5 0.763 .0.764 0.775 0.774 0.776 0.771 0.762 M6.

6 0.771 0.763 0.761 0.774 0.772 0.762 *.*28-0.758108 7 0.763 0.745 0.652 0.742 0.6831 0.745 0.673 Calibration Check: 22:53 L Weld e~sr 5"r-3'2-'~ Ts~cr.

Avg.,,,

0.740,A 0.7581 CE 0 0 0 0 0 0 0G Locationl l 23.17 welddn Bay Eev. 23'6" 2 017 0 0 0 0 0

_i_ BB c D EI F G i 300 0000.

1 1 .1571.169 1.141 1.154 1.168 1.162 1.147 M.

2 1.1761 1.170 1.161 1.162 1.156 1.171 1.160 0 140 0 0 0 0 3 1.175 1.183 1.170 166I 1.165 1.162 1.176 50- 0 0 0 0*0 4 1.172 1.189 1.188 1.881 r 1.190 1.171 1.151 6 0 00 0 0 0 0 5 1.190 1.195 1.185 1.192 1.192 1.195 1.189 6 i1.195- . 1.188 1.190- 1.184 1.193 1.180 7 0 0 0 0 0 7 71.177 1.17-5 1.180 1.181 1.183 1.199 1.192 I -ICalibration ~Tscr. Check: 0 22:48

.960 Ar oea 'l'° '

.. -i 3/8.1 along weld toe 3.-, I I4 M .1 Avg.below .960" COMMENTS:

Forty nine (49) readings were taken using the 8"x 8" template to determine the average reading.

100% scan of the weld and 100% scan within the 8"x 8" area to determine the minimum and the maximum thickness.

Minimum reading on weld was 0.689", Maximum reading on weld was 0.918".

Inspection area centered 55" left of vertical seam weld between plate 23-19 and plate 23-20, looking outward. Reference drawing 2E-187-29-001 RO. " -

Reviewed by:. Lee Stone CL.

• Level II Date 10/23/2006

• . . " 1*'mwzoe- 0,00r i .,-

File Name: ALI/A

'General Electric Measurement. Date:. io/24/2006 ster C Ultrasonic Thickness Data Sheet UT Procedtre: ER:AA-335-O4 Reuel- ot Specification:. IS-328727-.004 Page I E d A Level: I1. Instrument Type: Panametrics 37DL Plus Examiner. Jerem Tuttle Level: NIA Instrument No: 031120708 Examiner: N/A Transducer Type: D7908 . V ISerial :A 338302 1 Size: 0.200"I Freq: 7.5 Mhz I Angle: 0 Couplant Soundsafe Batch No: I - 1%920 Transducer Cable Type: Panametrics Length: 5' *0 Block Number. CAL-STEP-108 Calibration Block Type: C/S Step Wedge SYSTEM CALIBRATION

.0 Initial Cal. Time. Calibration Checks I Final Cal. Time I INSTRUMENT SETTINGS 2:28 See Data See Data . 3:27 Coarse Range: 2.0"- 5.0" Calibrated Sweep Range = 0.500" Inches to 1.500" Inches -I Coarse Dela)r. N/A 246518 . =Comp. Temp:, 52" Block Terpp: 56"'

Delay Calib: NIA: Thermometer" R2091258 I L Range Calm: N/A W/O Number.

Dose Drywell Containment Vessel Thickness Examination.

Instrument Freq. NIA Total Crew 9 Internal UT inspections.

Gain: 60 db Damping:

Reject Filter. '

N/A N/A N/A 2; 6" Wild Scan ' .

"- ] , d I -" I ,

23' J&6662 0 0 0 0 Location ID 23.15 weldup Bay 15 Elev. 6w A

-A .B C D E F G0 0.728 0.827 0.759 0.813 0 0 0 0 1 0.792 0.773 0.757  ! -

0.796 0.765 0.770 0.765 0.827 0.738 0.831 M0 0 0 0 0 0 2 r 50 0 0 c(: N0G, 3 0.745 0.7 28 0.655 0.787 0.827 0.826 0.823 0.826 0.832 0.829 .Max.

4 0.798 0.795 0.786 0.810 0.832 0.825 0.822 0.830 60 0 0 0.0 10.832" 5 0.799 0.790 0.789 0.799 0.811 7"0 0 0 0 .0 832 6 0.7991 0.7981_.792 0.825 0.813 0.803 0.805 I 7 0.791 0.794 0.797 0.828 0.808 Calibration Check: 03:04 L Weld ,

e 5 ',t T~~)Tscr. Avg.

0.740 0.79 10 A 0 0 0 -E0 F0 BC.D G 20 0 0 0 0 0 0 Bay 15 Elev. 23'6" Location ID 23.15 welddn E F G Mn. 3000000 0 A B C D 1.154 1.153. 1.149 1.154 1.156 1.187 1.147 40 0 0 0 0 0 1.1561 1.160 1.165 1.154 1.150 1.165 16 1 sO- 0 3 1.154 1.160 1.158 1.154 1.157 1.153 1171 1.149 1.18 1.165 60.0 0 0 0 0 0 4 1.157 1.161 1.149 1.160 5 1.167 1.156 1.145 1.170 1.167 1.160 1.150 1.158 1.167 1.157 1.164670 0 0 0 0 0 6 1.175 1.157 7 1.175 1.177 1.177 1.168 1.154 1 1671186

- - Calibration 0Chec

03.

Tscr. 0.960 Max. 1.186" Avg. [.160 COMMENTS:

reading..

Forty nine (49) readings were taken using the 8*x 8" template to determine the average and the maximum thickness.

weld and 100% scan within the 8"x 8" area to determine 'the minimum 100% scan of the Minimum reading on weld was 0.865", Maximum reading on weld was 1.029" and plate 23-19, looking outward. Reference nspection area centered 15" left of vertical seam weld between plate 23-18 J ,", 7 7.7,,.f .

wing 2E-187-29-001 RO.

Le- 11 ,-.

. I.-,-4,0 -

ReIvw b Lee Ston..

.L. Level II Date 10/24/2005 Reviewed by:. Lee Stone