ML063450029

2006/11/03-Oyster Creek: Licensee Final Document - Passport 00546049 07, Evaluation Related to Standing Water in Trenches (Pre-PORC Draft)(Pd)

ML063450029
Person / Time
Site:	Oyster Creek
Issue date:	11/03/2006
From:	AmerGen Energy Co
To:	Office of Nuclear Reactor Regulation
References
%dam200701, TAC 8261
Download: ML063450029 (88)

Text

Passport 00546049 07 (AR A2152754 E09)Page 1 of 8 Reason For Evaluation:

During the 1R21 Refueling Outage, standing water was found in the trench at elevation 10' 3" in Bay 5 of the Drywell. The purpose of this technical evaluation is to develop a conservative approach to address the worst case concerns associated with the as-found water in the drywell concrete.

This evaluation will assess the condition through comparisons of the original UT data taken in 1986, and the UT data taken during the 1R21 outage. Note that the sand and water corrosive environment was removed from the sandbed region in 1992. This evaluation will evaluate these UT results as they relate to potential corrosion concerns based on the current plant configuration with water existing in the drywell concrete area. This evaluation will address immediate concerns in the as-found wetted area of the drywell shell to demonstrate adequate design margins exist (in a worst-case scenario) to support startup of the plant and operation of the plant through the next cycle of operation.

The complete assessment of all UT data taken in 1R21 and establishing the associated margins to support operating through the period of extended operation of the plant will be addressed separately.

This Tech Eval was developed in accordance with CC-AA-309-101 Revision 7.The development of this Tech Eval was reviewed with Howie Ray in accordance with HU-AA-1212.

The risk rank was assessed as a "2". Therefore a third party review will be performed.

Background:

In 1986 concrete was removed in two locations (one each in Bays 5 and 17) from the interior Drywell floor at elevation 10' 3". Approximately a 1 foot wide by 2 foot long section was removed at each location.

These areas have been commonly referenced to as the "trenches".

The purpose of the "trenches" was to expose the Drywell Vessel below the concrete inside the Drywell at elevation 10' 3" so that UT readings could be performed on the vessel.The bottom of trenches in Bay 5 and 17 are located at approximately elevation 8' 9" and 9' 3" respectively, which generally correspond to the elevation of the sandbed floor located outside the Drywell. Therefore the UT readings from the original trench areas correspond to sections of the vessel that are not embedded in outside concrete.

The results of these UT inspections were documented in TDR 851 and drawing 3E-SK-S-85.

UT readings were taken on 1 inch centers. The results of the 1986 UT inspections show drywell thicknesses which are indicative of the vessel embedded on the inside of the Drywell and exposed to the sand environment on the outside, which was eventually eliminated in 1992 when the sand was removed from the sandbed region.In 1992, following the removal of the sand from the sandbed region and the removal of corrosion byproducts, the Drywell Vessel was visually inspected from inside the sandbed, which is outside the Drywell Vessel. This inspection identified the thinnest locations in each of the 10 sandbed bays. These thinnest locations were then UT inspected.

In some Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 2 of 8 cases the area had to be slightly grinded so that the UT probe could rest flat against the surface of the vessel. The thickness values and the locations of each reading, referenced from existing welds, were recorded on a series of NDE data sheets. At each location one UT reading was performed.

In 2006, UT readings of the interior Drywell shell were again recorded on 1 inch centers in the two trenches.

These readings were intended for a comparison with the 1986 readings.Also in 2006, 106 readings were taken of the external portion of the Drywell Vessel from within the former sandbed region. These locations were located using the 1992 NDE Inspection Data Sheet maps. These readings were intended for a comparison with the 1992 readings.Additionally, during the 1R21 outage in 2006 more concrete was removed from the bottom of the trench in Bay 5 to expose an additional 6" by 12" section of the drywell vessel. This newly exposed section of the vessel lies below the sandbed floor on the outside of the drywell. Therefore the results of this inspection show drywell thicknesses that are indicative of the vessel that is embedded on both sides by concrete.Detailed Evaluation:

Assumptions and Clarifications

1) TDR 851 documents that 23 values initially recorded in the Bay 17 trenches in 1986 were much less than nominal. Further NDE investigation at the time by GPUN NDE personnel and EPRI revealed that the low readings were due to inclusions in the steel plate rather than thin steel. This was later confirmed by the removal of a 2" diameter section of the Drywell vessel, which contained an inclusion (reference TDR 854). The UT technology in 1986 could not distinguish inclusions.

However the actual readings were captured in Drawing 3E-SK-S-85.

Inclusions of this nature and size were acceptable in the original manufacturing process per ASTM Specification A212B and do not effect the ultimate strength of each plate, which was individually certified by the manufacture per ASME Specification VIII (reference U-I Form Serial No. G-1276177).

Therefore for the purpose of this evaluation, all readings found to be lower than 0.780 inches were discounted from the 1986 readings for the trench in Bay 17. The discounted readings are circled in attachment

1. Please note this treatment of the 1986 data is actually conservative for computing corrosion rate if they were compared to the 2006 data, because the 1986 values (if included) would have reduced the 1986 average thickness.

The 2006 UT technology can now distinguish inclusions.

The results of the 2006 inspection shows no similar low values, since current technology automatically ignores the inclusions.

Therefore, this further verifies the conclusions made for these areas in 1986.Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 3 of 8 2) The uncertainties of the 1986, 1992, and 2006 UT readings can be as great as +/- .020 inches based on: a) The roughness of the inspected surfaces due to the previously corroded surface of the shell in the sandbed regions b) The different UT technologies between the 1986, 1992 and 2006 c) UT Equipment Instrument Uncertainties and d) The poor repeatability in attempting to inspect the exact same location over time 3) Row 7 points 6 and 7 in the Bay 17 trench data for 2006 were discounted because they were much thicker than the previous readings.

These points are located on a much thicker weld. These readings were re-verified by NDE to be correct, however these values were discounted to maintain conservative results.4) The sections of drywell vessel that were exposed by the removal of the concrete in trenches in 1986 continued to corrode from the exterior at elevated rates between 1986 and 1992 prior to the removal of the sand and epoxy coating application.

For example inspection in 1992 showed that corrosion rates in Bay 17 could have been as great as 0.0211 inches per year, with 95% confidence (ref. C-1302-187-5300-021).

The corrosion rates in the Bay 5 were estimated to be as great as 0.0113 inches per year, at 95%confidence (C1302-187-5300-028).

Therefore the material loss measured by the 2006 UT inspection would include the corrosion rates that were known to exist from the sandbed side (exterior) between 1986 and 1992.Acceptance Criteria Drywell Vessel Thickness criteria has been previously established (reference C-1302-187-5320-024) as follows: 1) General Uniform Thickness

-0.736 inches or greater.2) Vessel thicknesses in areas of 6" by 6" or smaller shall be greater than 0.693 inches.C-1302-187-5320-024 has previously dispositioned an area of this magnitude in Bay 13.3) Vessel thickness in areas of less than 2 inches in diameter shall be greater than 0.49 inches. This is the acceptance criterion for very local wall thickness; areas less than 2 inches in diameter.

C-1302-187-5320-024 calculated an acceptance criterion of .479 inches however; this evaluation is conservatively using .490 inches, which is the original GE acceptance criterion.

Since the UT readings were taken on 1 inch centers and the transducer size is less than 0.5 inch these readings can be characterized as less than 2 inches in diameter.Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 4 of 8 Comparison of the Bay 5 Trench The 1986 and 2006 data for the Bay 5 trench is located in attachment

1. A Mathcad spreadsheet that computes the average of each data set is provided in attachment 2.Please note that zero values are automatically discounted from the average and standard deviation computation.

These are the values that were concluded to be inclusions in the 1986 data (see assumption 1).The computation shows that a total of 294 readings were considered for 2006 and that the mean is 1.074 inches with a standard deviation of .0456 inches and a standard error of.00266 inches. This meets the general acceptance criteria of 0.736 inches with a 95%confidence.

The computation shows that a total of 302 readings were considered for 1986 and that the mean was 1.112 inches with a standard deviation of .045 inches and a standard error of.00259 inches. This meets the general acceptance criteria of 0.736 inches with a 95%confidence.

Assuming the material loss occurred continuously from 1986 to 2006 results in an apparent corrosion rate of 0.0019 inches per year. However when considering the aggressive corrosive environment that existed from 1986 to 1992 on the outside of the vessel, a corrosion rate of 0.0063 inches per year would be expected during this time frame (1986 to 1992). This rate is well within the range (up to 0.0113 inches per year)measured in bay 5 during this period (see assumption/clarification 4). Therefore, it can be concluded that all the material loss occurred between 1986 and 1992.The minimum 2006 reading in this trench was 0.957 inches. This meets the local acceptance criteria of 0.49 inches.Comparison of the Bay 17 Trench The 1986 and 2006 data for the Bay 17 trench is located in Attachment

1. A Mathcad spreadsheet that computes the average of each data set is provided in Attachment 3.Please note, zero values are automatically discounted from the average and standard deviation computation.

These are the 2006 points, which were much thicker than the previous readings (see assumption 3).The computation shows that a total of 290 readings were considered for 2006 and that the mean was 0.963 inches with a standard deviation of .0713 inches and a standard error of.004184 inches. This meets the general acceptance criteria of 0.736 inches with a 95%confidence.

The computation shows that a total of 250 readings were considered for 1986 and that the mean is 1.024 inches, with 95% confidence, a standard deviation of .045 inches, and a standard error of .002847 inches. This, meets the general acceptance criteria of 0.736 inches with a 95% confidence.

Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 5 of 8 Assuming the material loss occurred continuously from 1986 to 2006 results in an apparent corrosion rate of 0 .003055 inches per year. However when considering the aggressive corrosive environment that existed from 1986 to 1992 on the outside, a corrosion rate of 0.0102 inches per year would be expected during this time frame (1986 to 1992). This rate is well within the range (up to 0.0211 inches per year) measured in bay 17 during this period (see assumption/clarification 4). Therefore, it can be concluded that all the material loss occurred between 1986 and 1992.In addition the minimum 2006 reading in this trench was .702 inches which is estimated to be located in an area no larger than 4" in diameter.

This meets the acceptance of criteria 0.693 inches in an area of 6" by 6" or smaller.Comparison of external inspection locations correlating to beneath the interior Drywell floor at elevation 10' 3" but above the wetted area at elevation 9' 2".The 1992 and 2006 data are provided in attachment 4.Review of the 1992 and 2006 locations show 18 readings corresponding to this region (see attachment 5). For each reading the 2006 value was subtracted from the 1992 value and divided by 14 years (time between 1992 and 2006). Locations with positive rates were re-verified by NDE to be correct during the 2006 inspection.

However, since these values would result in positive changes in metal thickness, they were discounted from the computation to maintain conservative results.The resulting differences in UT readings based on point to point comparison in the as found wetted region vary between 0 and .0065 inches per year. On average the differences for this region, ignoring the described uncertainties, equate to 0.00228 inches per year.The minimum 2006 reading of all the areas was 0.669 inches. This meets the local acceptance criteria of 0.49 inches even after deducting the worst case differences including instrument uncertainties.

Comparison of External Inspection Locations correlating to beneath the wetted elevation of 9' 2" (approximate level at which water was discovered in the Bay 5 trench)Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 6 of 8 The 1992 and 2006 data are provided in attachment 4.Comparison of the 1992 and 2006 locations show 22 readings corresponding to this region (see attachment 5). For each reading the 2006 value was subtracted from the 1992 value and divided by 14 years (time between 1992 and 2006). Locations with positive rates were re-verified by NDE to be correct during the 2006 inspection.

However, since these values would result in positive metal growth, they were discounted from the computation to maintain conservative results.The resulting changes based on point to point comparison varied between 0 and .0061 inches per year. On average the changes for this region would equate to 0.00233 inches per year. These values can be conservatively used to demonstrate that even if the rates are not due to the expected uncertainties, there is sufficient margin existing to account for these uncertainties.

Discussion The maximum worst case localized differences between readings was found in a point-to point comparison of an external point (point 5 in bay 17) located below the concrete floor (not in either trench). The difference in thickness at this point equates to a rate of 0.0065 inches per year, which is not considered credible given the physical limitations of the UT inspections taken from the exterior surface. These limitations include the roughness of the inspected surfaces, the different UT technologies between the 1992 and 2006, UT Equipment Instrument Uncertainties, and the repeatability due to trying to locate the exact same location over time.However even when considering a 0.0065 inches per year rate of change (recorded on a location that is 0.822 inches thick in 2006) and applying it on the thinnest location recorded in 2006 (0.669 inches in Bay 13 point 11) and applying .020 inch deduction for instrumentation uncertainty this location would only reduce to 0.636 inches by 2008, which still demonstrates significant margins compared to the acceptance criteria of 0.49 inches. Also considering a 0.0065 inches per year rate of change and applying it the to the 2006 Bay 17 trench mean value (0.963 inches) and applying .020 inch deduction for instrumentation uncertainty would only reduce this value to 0.930 inches by 2008,

Conclusion:

The plates exposed by the two trenches exhibit signs of material loss. It is concluded that all the material loss occurred between 1986 and 1992. Assumed corrosion rates for this mechanism between 1986 and 1992 are consistent with as found measured corrosion rates previously established for these bays for this period in time.Additional concrete was removed from Bay 5 trench and UT readings taken 6 inches below the previous 1986 and 2006 readings.

This newly excavated area represents shell Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 7 of 8 thicknesses of the embedded region (on both sides) of the vessel in Bay 5 of sandbed region. The average Drywell shell thickness measured was 1.113 inches and the minimum reading was 1.052 inches. The UT Data Sheet is Attachment 7 to this evaluation.

The shell thickness in this area meets the general uniform thickness criteria of .736 inches with considerable margin. This area will be used to repeat these UT measurements in 1R22.Evaluation of the NDE examination results at and below the elevation 10'3" concrete slab concludes that the Drywell shell has sufficient thickness to withstand all design requirements.

References:

TDR 851, Rev. 0, "Assessment of Oyster Creek Drywell Shell, TDR 854, Rev. 0, "Drywell Corrosion Assessment" Drawing 3E-SK-S-85.

C-1302-187-5320-024, "OC Drywell UT Evaluation in Sandbed" Attachment 1 -1986 and 2006 Trench Inspection Data -10 pages Attachment 2 -Bay 5 Trench Comparison of 1986 and 2006 data -17 pages Attachment 3 -Bay 17 Trench Comparison of 1986 and 2006 data -16 pages Attachment 4 -1986 and 2006 Sandbed External Inspection Data -20 pages Attachment 5 -Plan and Elevation locations of the External Inspection locations-8 pages Attachment 6 -Comparison of 1986 and 2006 External Data -2 pages Attachment 7 -UT Data Sheet 1 R21 LR-032 -2 pages Attachment 8 -Third Party Review Documentation

-3 pages Attachment 9 -MPR Ass. Independent Review Documentation

-2 pages This evaluation was Independently Reviewed by Frank Stulb through out its development which took approximately 7 days.Comment resolution and incorporation of the Independent Third Party Review comments were discussed with Frank Stulb per a telephone conversation on 11/3/06 at 10:12 AM.He provided authorization for documentation and approval of his Independent Review of this document per this telephone conversation.

Independent Review: T. Tamburro for F. Stulb by telecon on 11/3/06 Manager Comments: The preparer and multiple reviewers of this technical evaluation had the appropriate knowledge and experience and are qualified to perform this task. The Independent Third Party Review (ITPR) was performed by MPR who was selected as a subject matter expert based on their expertise and industry experience on this topic. This document has been Document in Portal/J Passport 00546049 07 (AR A2152754 E09)Page 8 of 8 rigorously challenged and adequately addresses the adequacy of the as-found water conditions and potential impacts to demonstrate the drywell vessel maintains its design and licensing bases requirements to support restart from 1R21.The ITPR has been completed and comments adequately resolved as documented in Attachment 9.Manager Approval:

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dl General Electric Report Number, 1R21LR-Oyster Creek Ultrasonic Thickness Measurement Date: 10/21=2006 efuelng Outage- 1 R21 Data Sheet UT Procedure:

ER-AA-335-004 Page 1 of 2 Specification:, IS-328227-004 Examiner, Leslie Richter Level: II Instrument Type: Panametrics 37DL Plus Examiner:

Matt Wilson Level: II Instrument No: 031125009 Transducer Type: DV 506 Serial #: 072561 Size: 0.438" Freq: 5 Mhz Angle: 00 Transducer Cable Type: Panametrics Length: 5' Couplant:

Soundsafe Batch No: { 19620 Calibration Block Type: C/S Step Wedge Block Number'. CAL-STEP-1 39____ _ _ "SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks I Final Cal. Time Coarse Range: 2.0" 11:01 11:32 12:05 12:38 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to' 1.500" Inches Delay Calib: N/A Thermometer:, 246647 Comp. Temp: 710 Block T"emp: 68 Range Calib: N/A W/O Number, C2013479 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examlnation.

Gain: 63 db Internal UT Inspections.

Damping: N/A Reject: N/A Trench !Filter. N/A A B C D E F G Thickness readings taken at holes located in 1 template.

2 '(DI90 0 0 0 9 1." 0 0: The UT transducer was positioned in the same r 3 0 0 0 C 0 0 0 (0 orientation at each grid point.__ _ _ _ 4 00QOQOO'r'---~~~ 4ASO. -0 0 0 0 0 0 0o, 0 0 0 0 0 0 0 00546049 07 60 AR# A2152754 E09 0.uCME~ 7 0)000000, PAGE OF _L) [-I- I I -.I'^ I COMMENTS: Template was placed at the bottom of the trench and forty-nine (49) points were recorded, then template was relocated above previous location with the centerline of the bottom row 1" +/- 1/16" from previous grid top row.A "W" was stamped next to each side of each template location and above and below top and bottom.A total of 294 reading were taken.

.2 oF4 Y I File Namel ~1I.R- 2 ~General Electric Ultrasonic Thickness Measuremen Oyster Creek File Name: 1R1LR-25 t Date: 10/18/2006 UTI U Procedur ER-AA-335-004 4 Refueling Outage -111121 i Data Sheet k Page 2 of 2 1R21 I Grid Procedure:1 IS-328227-004 r Bottom of Trench Location ID Trench 2 Bay 17 Elev. 10' 3" A B C D E F G 1 0.937 0.970 0.927 0.946 0.932 0.918 0.942 2 0.924 1.059 0.934 0.941 0.968 0.924 0.916 3 0.948 0.948 0.963 0.941 0.932 0.937 0.967 4 0.977 0.983 1.032 0.982 0.983 0.997 0.953 5 0.972 0.932 0.977 0.973 1.005 0.959 1.028 6 1.026 1.002 0.968 0.972 0.953 0.964 0.990 7 0.981 1.006 0.967 0.945 0.968 0.943 0.978 8 1.026 0.958 0.958 1.026 0.982 0.988 0.967 9 1.026 0.906 0.915 0.991 1.006 0.984 0.962 10 0.979 0.933 1.027 0.934 0.969 0.956 1.042 11 0.963 1.003 1.016 1.062 0.969 0.987 1.030 12 1.027 0.977 1.039 0.999 0.998 1.027 1.039 13 1.023 1.001 0.959 0.997 0.974 1.003 1.090 14 0.986 1.004 1.009 0.946 1.016 1.023 0.995 15 0.966 1.069 1.014 1.055 0.995 1.002 1.029 16 0.987 0.983 0.942 0.941 1.010 1.023 1.016 17 1.034 1.008 0.971 1.064 0.985 1.022 1.032 18 0.972 1.021 0.985 0.992 1.003 0.997 1.008 19 0.975 0.951 0.985 1.059 1.047 0.935 0.980 20 0.940 0.967 0.895 1.020 1.044 1.075 0.980 21 0.918 0.897 0.934 1.036 1.058 0.998 1.009 22 0.973 0.954 1.004 1.013 1.011 1.043 0.948 23 0.998 0.952 1.007 1.000 0.963 1.006 0.951 24 OBST. 0.978 0.979 0.935 1.014 0.981 1.015 25 1.017 1.074 0.968 0.963 0.966 1.014 1.030 26 1.038 1.053 1.026 1.008 0.983 0.979 1.039 27 0.968 1.028 0.998 1.017 1.004 1.030 1.046 28 1.028 0.950 1.047 1.000 0.977 1.002 1.616 29 0.997 1.023 1.060 1.015 0.964 0.995 0.997 30 1.061 0.958 1.022 1.044 0.991 0.990 1.001 31 1.008 1.021 1.010 1.010 1.003 0.959 0.963 32 0.988 0.991 0.961 0.940 1.029 0.979 0.929 33. 1.005 1.014 1.003 0.896 0.944 1.013 0.885 34 0.990 0.976 0.962 0.909 0.905 0.863 0.923 35 0.954 0.954 OBST. 0.885 0.887 0.877 0 36 0.963 0.972 0.877 0.835 0.891 0.831 0.894 PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT I PAGE Y- OF Z2 I (2~cj 37 0.897 0.937 0.903 1 0.893 0.838 0.781 0.841 38 0.855 0.884 0.853 0.850 0.840 0.814 0.788 ___.39 0.802 0.891 0.838 0.790 1.082 OBST. 0.809 Tscr, AVG.40 0.746 0.795 0.776 0.822 0.75711.0420.794 0.660 0.963 41 0.702 0.779 0.811 0.835 0.723 j 0.738 U0.837 M 1n-Re-a-dng Max. Reading 42 0.726 0.825 0.878 0.868 [ OBST. 10.864 0.954 1 0.702 1.090 Top -I Examined by Jeremy Tute / Level II Examined by N/A Level N/A Reviewed by:. Lee Stone Level II Date 10/21/2006 Date N/A Date 10121/2006 70000 0 60 50 40 30 20 000 000 000 000 000 000 00 00 00 00 00 00 00 0 0 0 0.0 0 0 70 50 40 30 20 I0 000 000 000 000 000 000 000 00 00 00 00 00 00 00 0 0 0 0 0 0 0 70 60 50 40 30 20 000 000 000 000 000 000 000 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19'18 17 16 15 Template layout for Trench UT data.IO PASSPORT#00546049 07 AR# A21527 5 4 E 0 9 ATTACHMENT L PAGE --I OF 00 00 00 00 00 00 00 0 0 0 0-0 0 0/Centedine of bottom row is 1 +/- 1/16" from previous praw I 1" w 70 60 50*40 30 20 ,C)00 00 00 00 00 00 0 0 0 0 0 0 C)00 00 00 00 00 00 r) ('0 0 0 0 0 0 r)7000 O000 5000*4000 3000 2000 ,000 0 0 0 0 0 0 0 00 00 00 00 00 00 O00 0 0 0 0" 0 0 14 13 12'11 10 9 8 000 70000 60000 50.000 40000 30000.20000 10000 G F E P 000 000 000 000, 000 000 000 7 6 5 4 3 2 Template placed at Bottom of Trench.

.ti' g6 i PASSPORT#07 00546049 07 AR# A2152754 E09 ATTACHMENT L PACGE L OF General Electric-I File Name:! IR21LR- 25-Oyster Creek Ultrasonic Thickness Measuremeni I Data Sheet t Date: 10r2ofrA UT Procedure]

ER-AA-335-004 Refueling Outage- 11R21 Pac I f 2 .I Specifichtion]

IS1-32=27-004 Examiner Jeremy Tuttle Level: II Instrument Type: Panametrics 37DL Plus Examiner N/A V Level: N/A Instrument No: 031125009 Transducer Type: DV 506 FSerial #- 072362 Size: 0.438" Freq: 5 Mhz le: 0" 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. Time Calibration Checks Final Cal. Time Coarse Range: 2.0" 7:17 8:22 N/A 9:05 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1-500" Inches Delay Calib: WA Thermometer 246672 =Comp. Temp: 73° 1Block Temp: 88 Range Calib: N/A W/O Number C2013479 Instrument Freq. N/A: Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 51 db 223 mr Internal UT inspectlonrý Damping: N/A Reject N/A Trench 2 Bay 17 Filter N/A V A B C D E F G Thickness readings taken at holes located in I O TO( 0~ 0~ 0 0 0~(itemplate.

1.-The UT transducer was positioned in the same .9L-orientation at each grid point. 3 0000 Q00 PASSPORT*'#

4 QQQ AR# £2152754 Eo0 5 0 0 0 0 0 0 0 ATirACH-E.T -L , : O PAGE-2 OF 00 00 00 0.I -__ I I I 700 0000'COMMENTS: Grid Template aligned with V-stamps.Template was placed at the bottom of the trench and forty-nine (49) points were recorded, then template was relocated above previous location with the centerline of the bottom row 1" +1- 1/16" from previous grid top row.A total of 290 readings were taken.All obstructions due to rough surface conditions.

Some readings taken as best effort readings due to rough surface n-nndifinna Reviewed by: Lee Stone Level 11 Date 10/21/2008 IOJ21200 Reviewed by Lee Stone ~L. ~ Level II Date I 0)21~OOS 2 o#9 General Electic Oyster Creek Ultrasonic Thickness Measuremeni IL File Name: 1R21LR- Z'f-Refuelina Outage -IR21 2 Data Sheet Date:I 10/21/2006 UT Procedure:

ER-AA-335-004 Grid Procedure:" IS-328227-004 mEL -I Bottom of Trench U Page 2 of I 2 1 I Ill Bottom of Trench Location ID, Trench I Bay 5 Elev. 10' 3" A B C D E F G 1 1.059 1.034 1.036 1.106 1.074 1.131 1.078 2 1.061 1.021 1.008 1.051 1.047 1.049 1.024 3 1.062 1.026 1.047 1.026 0.968 1.049 1.032 4 1.016 1.055 1.026 0.959 1.013 1.061 0.987 5 1.027 1.046 1.001 0.993 1.064 1.070 0.993 6 1.035 1.021 1.004 0.985 1.013 1.150 0.957 7 1.032 1.054 1.023 1.033 0.962 0.962 0.991 8 1.065 1.023 1.069 1.043 1.092 1.028 1.030 9 1.111 1.037 1.086 1.071 1.044 0.996 0.976 10 1.061 1.034 1.009 1.099 1.036 0.988 1.105 11 1.014 1.022 1.028 1.142 1.064 1.040 1.041 12 1.125 1,146 1.145 1.125 1.079 1.087 1.089 13 1.101 1.157 1.127 1.155 1.072 1.130 1.043 14 1.116 1.077 1.108 1.094 1.087 1.056 1.051 15 1.127 1.042 1.119 1.126 1.079 1.102. 1.075 16 1.109 1.176 1.169 1.112 1.054 1.131 1.113 17 1.106 1.090 1.096 1.079 1.073 1.083 1.030 18 1.094 1.115 1.073 1.068 1.065 1.073 1.091 19 1.045 1.117 1.049 1.114 1.082 1.090 1.095 20 1.111 1.123 1.117 1.086 1.138 1.090 1.091 21 1.151 1.131 1.145 1.091 1.075 1.116 1.114 I 22 1.126 1.094 1.159 1.058 1.088 1.109 1.134 23 1.129 1.100 1.162 1.023 1.096 1.112 1.070 24 1.089 1.159 1.137 1.109 1.091 1.165 1.124 25 1.135 1.167 1.099 1.075 1.141 1.122 1.050 26 1.054 1.050 1.036 1.074 1.032 1.078 1.070 27 1.134 1.045 1.026 1.082 1.171 1.145 1.178 28 1.069 1.085 1.102 1.142 1.120 1.061 1.116 29 1.020 1.065 1.068 1.021 1.040 1.001 1.066 30 1.085 1.064 1.045 1.033 1.006 1.033 1.056 31 1.047 1.059 0.997 1.083 1.018 1.065 1.030*32 1.084 1.062 1.063 :1.105 1.143 1.089 1.048 33 1.107 1.093 1.057 1.050 1.130 1.061 1.064 34 1.099 1.066 1.005 1.027 1.044 1.018 1.073 35 1T059 1.11 1.045 1.023 1.039 t.68 .I1.0 36 1.067 1.072 1.041 1.035 1.030 1.015 1.047 IPASSPORT#

00546049 07 AR# A2152754 E09 ATTACHMENT L PAGE .& OF +/-2 bfe&37 1.093 1.0501 1.0991 1.039 1.0331 U.992 1.033 38 1.142 1.094 1.099 1.0861 1.086 1.039 1.048 39 1.151 i.122 1.112 1.074 1.115 1.073 1.049 Tscr. AVG.40 1.132 1.115 1.103 1.106 1.083 1.052 1.047 0.660 1.074 41 1.137 1.130 1.139 1.119 1.106 1.084 1.0871 Min Reading Max. Reading 42 1.113 1.131 1.097 1.122 1.131 1.1041 1.063 0.957 1.178 Top I -L 132:/0- V~ -o (p Examined by Leslie Richter Examined by Matt Wilson Reviewed by. Lee Stone Level II Level II Level II Date 10/21/2006 Date 10/2112006 Date 10/2112006 PASSPORT#A 00546049 07 AR# A2152754 E09 ATTACHMENT 1 PAGE _ OF L_

70000 60000 5Q 00 0-40000 30000 20000 ,000Q 00.00 00 00 00 00 OO 0 0 0 0-0 0 n 70000 60000 50000 40000 30000 20000 10000 O0 00 00 00 00 00 00.0 0 0 0-0 0 0 U 70000 60000 50000 40000 300.00 20000.0000 00 00 00 00 00 00 00 0 0 0 0-0.0 0 42 41 40-39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 Template layout for Trench UT data.PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT L_PAGE OF ._I['Ce-nterine of bottom row is 1"+/- 1/16" from previous P row 1" v ....L i U 70000 60000 50000 40000 300000 0 20000 00 00 00 00 00 00 00 0 0 0 0 0 0 O 1 .......7000 0 60000 50000"40000 30000 20000 o)oo0 00 00 00 00 00 00 0 0 0 0 0 0 0 0 O 70000 60000'50.00 0 40000 30000 20000 10000 G F E P 000 000 000 000-000 000 C B A 7 6 5-4 3 2 Template placed at Bottom of Trench Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 1 of 17 Attachment 2 Attachment 2 -Bay 5 Trench 1986 Data The data shown below was collected in 1986 in the trench in Bay 5 page := READPRN("H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-1.txt")

Points 49 showcells(page, 7,0)1.156 1.166 1.182 1.172 1.225 1.181 1.171 1.16 0 1.184 1.173 1.175 1.171 1.176 1.165 1.164 1.151 0 0 1.17 1.17 Points 49= 1.145 1.151 1.158 1.162 1.155 1.159 1.172 1.123 1.151 1.148 1.167 0 1.139 1.156 1.1.28 1.138 1.141 1.157 1.158 1.144 1.159 1.123 1.149 1.13 0 0 0 0 XXXS convert(Points 4 9 , 7)No DataCells

=Iength( XXXS)XXXS deletezero cells (XXXS, No DataCells) page = READPRN( "H:\MSOFFICE\Drywell Program data\ 1986 trenches\Trench5-2.txt")

Points 49 := showcells(page, 7,0)1.109 1.121 1.144 1.155 1.156 1.149 1.155 1.064 1.066 1.068 1.115 1.1 1.109 1.124 1.051 1.096 1.041 1.077 1.162 1.078 0 Points 4 9= 1.063 1.1 1.11 1.048 1.101 1.11 1.133 1.047 1.109 1.149 1.13 1.176 1.179 1.058 1.125 1.123 1.09 1.117 1.182 1.2 1.182 1.135 1.091 1.107 1.08 1.084 1.125 1.183 XXX:=convert(Points 49, 7) No DataCells:=

length( XXX)XYXX := deletezero cells (XXX, No DataCells)

Cells 86 :=stack(XXX, XXXS) -... th rll DataCells 5 ý 86j No DataCells

= 89 Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 page := READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-3.txt")

Points 49 := showcells(page, 7,0)Sheet No.2 of 17 Points 49 =1.094 1.064 1.067 1.043 1.079 1.052 1.058 1.055 1.082 1.087 1.049 1.058 1.18 1.118 1.093 1.138 1.071 1.109 1.109 1.082 1.158 1.079 1.079 1.044 1.114 1.043 1.137 1.098 0 1.169 1.14 1.119 1.164 0 1.071 0 1.137 1.083 1.053 1.164 1.062 1.178 1.156 1.096 0 1.194 1.166 1.134 1.056 No DataCells

!= length(XXX)

XXX := convert(Points 49, 7)XXX := deletezero cells(XXX, No DataCells)

Cells 86 :=stack (Cells 86' XXX)No DataCells

= length(Cells 86)No DataCells

= 134 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-4.txt")

Points 49 -showcells(page, 7,0)1.141 1.128 1.089 1.159 0 0 1.166 1.127 1.105 Points 4 9= 1.109 1.148 0 1.089 1.167 0 1.126 1.092 1.178 1.069 1.054 1.112 XXX :=convert(Points 4 9 , 7)1.154 1.164 1.141 1.122 1.17 0 1.151 1.105 1.174 1.169 1.105 1.131 1.166 1.171 1.113 1.141 1.18 1.128 1.133 1.106 0 1.167 1.124 1.072 1.089 1.146 1.119 1.098 No DataCells length(XXX)

XXX := deletezero cells(XXX, No DataCells)

Cells 86 :=stack(Cells 86, XXX) No DataCells

=length (Cells 86)No DataCells

= 177 Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-5.txt")

Points 49 := showcells(page, 7,0)Sheet No.3 of 17 Points 49 1.076 1.118 1.067 1.088 1.094 1.128 1.065 1.056 1.054 1.073 1.106 1.119 1.134 1.077 1.098 1.1 1.11 1.171 1.115 1.125 1.179 0 1.159 1.205 1.193 1.148 0 1.168 1.139 1.06 1.149 1.041 1.092 1.147 1.077 1.098 1.062 1.09 1.134 1.118 1.145 1.068 1.077 1.101 1.113 1.093 1.109 1.112 1.073 XXM : =convert (Points 4 9 ,7 7)No DataCells:=

length( XXX)XXX := deletezero cells(XXX, No DataCells)

Cells 86 :=stack (Cells 86, XXX) No DataCells:=

length (Cells 86)No DataCells

= 224 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-6.txt")

Points 49 := showcells(page, 7,0)Points 4 9=1.062 1.1 1.044 1.031 1.035 1.024 0 1.101 1.062 1.052 0 0 1.103 1.057 0 1.141 0 1.057 1.076 1.03 1.021 1.088 1.059 1.045 1.073 1.06 1.059 1.015 1.069 1.11 1.083 1.059 1.016 1.061 1.028 1.074 1.076 1.081 1.109 1.074 1.062 1.089 1.067 1.078 1.076 1.062 1.037 1.076 1.08 XXX :=convert (Points 49,7 )No DataCells

= length(XXX)

XXX:= deletezero cells(XX, No DataCells)

Cells 86 := stack(Cells 86, XXX)No DataCells

= length (Cells 86)page'.= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench5-7.txt" )Points 49 := showcells(page, 7,0)

Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.4 of 17 Points 49 =1.087 0 1.168 1.271 1.211 0 0 1.11 1.132 1.112 1.138 1.158 0 0 1.027 1.049 1.113 1.117 1.099 0 0 1.04 1.096 1.101 1.103 1.133 0 0 1.07 1.052 1.056 1.152 1.134 0 0 1.079 1.093 1.065 1.142 1.145 0 0 1.081 1.092 1.108 1.108 1.108 0 0 XXX :convert(Points 49' 7)No DataCells:

length( XXX)XXX := deletezero cells(XXX, No DataCells)

Cells 86 =stack (Cells 86, XX) No DataCells

length(Cels 86)No DataCells

= 302 No DataCells

= 302 The thinnest point at this location is shown below minpoint := min(Cells 86)minpoint = 1.0 1 5o 10 3 Passport 0546049 07 Tech Eval, A2152754 E09 Attachment 2 Sheet No.5 of 17 Mean and Standard Deviation 1186 actual :=mean(Cells 86)p186 actual = 1.1123*103 a86 actual := Stdev(Cells 86)a86 actual = 45.002 Standard Error (Y86 actual Standard error ac/No DataCells Standard error = 2.59 Skewness (No DataCells) .I(Cells 86- ,t86 actual)3 Skewness (No DataCells-1

). (No DataCells-2). (Y86 actual)3 Skewness = 0.132 Kurtosis No DataCells (No DataCells+

1) .-(Cells 86 -g86 actual)4 Kurtosis :-(No DataCells

-1 ) (No DataCells

-2). (No DataCells

-3). (a86 actual)4+ _ 3.(NO DataCells-1)2 (No DataCells-

2) .(No DataCells-3)Kurtosis = -0.534 Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 6 of 17 Attachment 2 Normal Probability Plot In a normal plot, each data value is plotted against what its value would be if it actually came from a normal distribution.

The expected normal values, called normal scores, and can be estimated by first calculating the rank scores of the sorted data.j =0.. last(Cells

86) srt :=sort(Cells 86)Then each data point is ranked. The array rank captures these ranks r j :=j+ I-IX(srt~srt).) -r rank. :=, s Zsrt-srt.rank.p: rows(Cells

86) + I The normal scores are the correspondingpth percentile points from the standard normal distribution:

x:=I NScore. :=rootcnorm(x)- (pi),x]

Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 7 of 17 Attachment 2 Upper and Lower Confidence Values The Upper and Lower confidence values are calculated based on .05 degree of confidence "a" No DataCells

=length (Cells 86)a:=05 Ta :=q{(1 -2 O) 'No DataCells]

Ta= 1.968 a86 actual3 Lower 95%Con:= 486 actual- Ta Lower 95%Con = 1.107e100 4No DataCells a86 actual Upper 95%Con := g86 actual + Ta.. Upper 95%Con = 1.117.103 No DataCells These values represent a range on the calculated mean in which there is 95% confidence.

Graphical Representation Distribution of the "Cells" data points are sorted in 1/2 standard deviation increments (bins) within +/- 3 standard deviations 0 Bins := Make bins (1t86 actual, 086 actual) 3 14 42 Distribution:=

hist(Bins, Cells 86) 45 Distribution

= 54 i41 The mid points of the Bins are calculated 43 45 k :=0.. 11 Midpointsk (Binsk+ Binsk+-l) 11 2 2 1.The Mathcad function pnorm calculates a portion of normal distribution curve based on a given mean and standard deviation normal curve0 ,= pnorm(Bins,, g86 actual, 08 6 actual)normal curvek := pnorm (Binsk+I, V86 actual, 086 actual) -Pnorm(Binsk' g86 actual, a86 actual)normal curve No DataCells'normal curve Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.8 of 17 Results For Elevation Sandbed elevation Locatiobn Oct. 2006 The following schematic shows: the the distribution of the samples, the normal curve based on the actual mean and standard deviation, the kurtosis, the skewness, the number of data points, and the the lower and upper 95% confidence values. Below is the Normal Plot for the data.Data Distribution 60 40 Distribution normal curve minpoint = 1.0150103 Standard error = 2.59 Skewness = 0.132 Kurtosis = -0.534 1100 1150 1200 1250 oints, Midpoints Upper 95%Con = 1. 117* 103 20!950 1000 Lower 95%Con = 1.107-103 1050 Midpo gt86 actual = 1. 112-103 a86 actual = 45.002 minpoint = 101@1 A Kurtosis value which is less than +/- 1.0 and approaches 0 is indicative of a normal distrubution Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 9 of 17 Attachment 2 Normal Probability Plot 3I x 2 The Normal Probability Plot and the Kurtosis this data is normally NScorej o distributed.

xxx-l-2-3 I I I I I 1000 1050 Uo00 1150 1200 1250 1300 SrI.A Normal Probability Plot which approaches a straight line is indicative of a normal distrubution Passport 0546049 07 Sheet No..Tech Eval. A2152754 E09 10 of 17 Attachment 2 OCT 2006 Data The data shown below was collected in 2006 in the trench in Bay 5 page:= READPRN( "H:MSOFFICE\Drywell Program data\2006 trenchs\Trench5-I.txt")Points 4 9 := showcells(page, 7,0)1.067 1.072 1.041 1.035 1.03 1.015 1.047 1.093 1.05 1.099 1.039 1.033 0.992 1.033 1.142 1.094 1.099 1.086 1.086 1.039 1.048 Points 4 9= 1.151 1.122 1.112 1.074 1.115 1.073 1.049 1.132 1.115 1.103 1.106 1.083 1.052 1.047 1.137 1.13 1.139 1.119 1.106 1.084 1.087 1.113 1.131 1.097 1.122 1.131 1.104 1.063 XXXS := convert(Points 49' 7)No DataCells

= length(XXXS)

XXXS deletezero cells (XXXS, No DataCells) page:= READPRN("H:

MSOFFICE\Drywell Program data\2006 trenchs\Trench5-2.txt")

Points 49 := showcells(page, 7,0)1.02 1.065 1.068 1.021 1.04 1.001 1.066 1.085 1.064 1.045 1.033 1.006 1.033 1.056 1.047 1.059 0.997 1.083 1.018 1.065 1.03 Points 4 9 = 1.084 1.062 1.063 1.105 1.143 1.089 1.048 1.107 1.093 1.057 1.05 1.13 1.061 1.064 1.099 1.066 1.005 1.027 1.044 1.018 1.073 1.059 1.118 1.045 1.023 1.039 1.068 1.087 XXX convert(Points 4 9 , 7) No DataCells length( XXX)XXX :=deletezero cells (XXX, No DataCells)

Cells 06 :-stack(XXX, XXXS) No DataCells

=length(Cells 06)No DataCells

= 98 Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 page := READPRN( "H:AMSOFFICE\Drywell Program data\2006 trenchs\Trench5-3.txt")

Points 49 := showcells(page, 7,0)Sheet No.11 of 17 Points 49 =1.126 1.129 1.089 1.135 1.054 1.134 1.069 1.094 1.1 1.159 1.167 1.05 1.045 1.085 1.159 1.162 1.137 1.099 1.036 1.026 1.102 1.058 1.023 1.109 1.075 1.074 1.082 1.142 1.088 1.096 1.091 1.141 1.032 1.171 1.12 1.109 1.112 1.165 1.122 1.078 1.145 1.061 1.134 1.07 1.124 1.05 1.07 1.178 1.116 XXX : =convert (Points 4 9 , 7 )No DataCells

= length(XXX)

XXX := deletezero cells (XXX, No DataCells)

Cells 06 :=stack(Cells 06' XXX)No DataCells:=

length(Cells 06)No DataCells

= 147 page :=READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trench5-4.txt")

Points 49 := showcells(page, 7, 0)Points 4 9=1.127 1.109 1.106 1.094 1.045 1.111 1.151 1.042 1.176 1.09 1.115 1.117 1.123 1.131 1.119 1.169 1.096 1.073 1.049 1.117 1.145 1.126 1.112 1.079 1.068 1.114 1.086 1.091 1.079 1.054 1.073 1.065 1.082 1.138 1.075 1.102 1.131 1.083 1.073 1.09 1.09 1.116 1.075 1.113 1.03 1.091 1.095 1.091 1.114 XXX := convert(Points 49, 7)No DataCells

= length(XXX)

XXX := deletezero cells (XXX, No DataCells)

Cells 06 :=stack(Cells 0 6' XXX)No DataCells

= length(Cells 06)No DataCells

= 196 Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.13 of 17 Mean and Standard Deviation p06 actual :=mean(Cells 06)pi06 actual = 1.0743o103 a06 actual := Stdev(Cells 0 6) a06 actual = 45.628 Standard Error Standard error -06 actual No DataCells Standard error = 2.661 Skewness Skewness (No DataCells)

-2(Cells 06- g06 actual)3 (No DataCells

-i) (No DataCells

-2) (a06 actual) 3 Skewness = -0.071 Kurtosis No DataCells'(No DataCels +1) .I(Cells 06 -g06 actual)4 (No DataCells

1) -(NO DataCells DataCells-3). (a06 actual)4+. 3"-(No DataCells-1)2 (No DataCells-

2) (No DataCells 3)Kurtosis = -0.432 Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.12 of 17 page := READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trench5-5.txt")

Points 49 := showcells(page, 7,0)Points 49 =1.065 1.111 1.061 1.014 1.125 1.101 1.116 1.023 1.037 1.034 1.022 1.146 1.157 1.077 1.069 1.086 1.009 1.028 1.145 1.127 1.108 1.043 1.071 1.099 1.142 1.125 1.155 1.094 1.092 1.044 1.036 1.064 1.079 1.072 1.087 1.028 0.996 0.988 1.04 1.087 1.13 1.056 1.03 0.976 1.105 1.041 1.089 1.043 1.051 XXX := convert(Points 4 9 ,7)No DataCells

= length(XXX)

XXX := deletezero cells (XXX, No DataCells)

Cells 06 :=stack(Cells 06, XXX)No DataCells

= length (Cells 06)No DataCells

= 245 page:= READPRN( "HAMSOFFICE\Drywell Program data\2006 trenchs\Trench5-6.txt")

Points 4 9:=showcells(page,7,0)

Points 4 9=1.059 1.061 1.062 1.016 1.027 1.035 1.032 1.034 1.021 1.026 1.055 1.046 1.021 1.054 1.036 1.008 1.047 1.026 1.001 1.004 1.023 1.106 1.051 1.026 0.959 0.993 0.985 1.033 1.074 1.047 0.968 1.013 1.064 1.013 0.962 1.131 1.049 1.049 1.061 1.07 1.15 0.962 1.078 1.024 1.032 0.987 0.993 0.957 0.991 XXX := convert(Points 49' 7)No DataCells

= length(XXX)

XXX := deletezero cells(XXX, No DataCells)

Cells 06 :=stack(Cells 06, XXX)No DataCells

= length (Cells 06)No DataCells

294 minpoint:

min(XXX)minpoint = 957 The thinnest point at this location is shown below minpoint:=

min(Cells 06)minpoint = 957 Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 14 of 17 Attachment 2 Normal Probability Plot In a normal plot, each data value is plotted against what its value would be if it actually came from a normal distribution.

The expected normal values, called normal scores, and can be estimated by first calculating the rank scores of the sorted data.=0.. last(CeIls

06) srt :=sort(Cells 06)Then each data point is ranked. The array rank captures these ranks z.:=j+ I rank :z Tsrt-srt.rank.pJ- rows(CeIls 0 06) -t- 1 The normal scores are the corresponding pth percentile points from the standard normal distribution:

x::l NScore. :=roof cnorm(x)- (pi),x]

Passport 0546049 07 Sheet No.Tech Eval. A2152754 E09 15 of 17 Attachment 2 Upper and Lower Confidence Values The Upper and Lower confidence values are calculated based on .05 degree of confidence "a" No DataCells:=

length(Cells 06)a :=.05T -2) ' No DataCells]

Ta =-1.968 Lower 95%Con := li06 actual- Ta. actual Lower 95%Con =1.069-103DataCells a06 actual Lower 95 %Con := pa06 actual'l To," No DataCells Lower 95 %Con = 1.069° 103 Upper 95%Cofl := g06 actual~ Ta* 0 ata Upper 95%Conl = 1.08- 10 3 FNo DataCells These values represent a range on the calculated mean in which there is 95% confidence.

Graphical Representation Distribution of the "Cells" data points are sorted in 1/2 standard deviation increments (bins) within +1- 3 standard deviations 2 Bins:=Make bins(g106 actual' a06 ata) 4 13 28 Distribution:=

hist (Bins, Cells 06) 54 Distribution 51 The mid points of the Bins are calculated 48 42 33 k:=0.. 11 Midpointsk (Binskl" Binsk+ 1) 14 2. 5 0 The Mathcad function pnorm calculates a portion of normal distribution curve based on a given mean and standard deviation normal curve 0 pnorm(Bins,, 1 06 actual, a06 actual)normal curvek pnorm(Binsk, I'0 actual, a06 actual) -pnorm(Binsk, V06 actual, a06 actual)normal curve := No DataCells normal curve Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.16 of 17 Results For Elevation Sandbed elevation Locatiobn Oct. 2006 The following schematic shows: the the distribution of the samples, the normal curve based on the actual mean and standard deviation, the kurtosis, the skewness, the number of data points, and the the lower and upper 95% confidence values. Below is the Normal Plot for the data.Data Distribution 60 40 minpoint = 957 Standard error = 2.661 Skewness = -0.071 Kurtosis = -0.432 Distribution nrl normal curve 2 0 L 9W0 950 1000 1050 Midpoints, Midpoint, 1100 1150- 1200 Lower 95%Con = 1.069"103 Upper 95%Con = I.08 10 3 406 actual = 1.074-103 W06 actual = 45.628 minpoint = 957 A Kurtosis value which is less than +/- 1.0 and approaches 0 is indicative of a normal distrubution Passport 0546049 07 Tech Eval. A2152754 E09 Attachment 2 Sheet No.17 of 17 Normal Probability Plot'I 2 1 NScorej 0 xxx!x The Normal Probability Plot and the Kurtosis this data is normally distributed.

-1 ý--Xx x x x-3 I I II 950 1000 1050 1100 1150 1200 Sr.t A Normal Probability Plot which approaches a straight line is indicative of a normal distrubution Corrosion Rate assuming corrosion occured between 1986 and 2006 (1186 actual -g06 actual)= 1.9 2006- 1986 Corrosion Rate assuming corrosion occured between 1986 and 1992 (1186 actual -9106 actual) = 6.334 1992- 1986 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Attachment 3 Bay 17 Trench 1986 Data The data shown below was collected in 1986 in the trench in Bay 17 page := READPRN( "HAMSOFFICE\Drywell Program data\1986 trenches\Trenchl7-1.txt")

Points 49 := showcells(page, 7,0)Sheet No.1 of 16 Points 49 =0.93 1.014 0.991 0.995 1.025 1.017 1.041 0.932 0.953 1.005 0.995 1.011 1.036 1.055 0.943 0.984 0.951 1.038 0.968 1.029 1.044 0.958 0.987 0.968 1.031 1.024 1.031 1.047 0.927 0.973 0.939 0.992 1.004 1.084.1.043 0.889 0.939 0.945 1.003 1.002 1.026 0 0.913 0.956 0.956 1.011 1.055 1.05 0 XXXS : =convert (Points 49, 7)No DataCells

= length(XXXS)

XXXS := deletezero cells (XXXS, No DataCells) page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trenchl7-2.txt")

Points 4 9:= showcells(page, 7,0)Points 4 9=1.045 0.991 1.031 1.087 0.998 0.964 0.906 1.009 1.012 1.101 1.059 1.065 1.019 1.04 1.024 1.041 1.081 1.069 1.048 0.987 1.019 1.026 1.031 1.077 1.057 1.004 1.055 0.98 1.008 1.017 1.04 1.102 1.014 1.045 1.024 1.07 1.076 1.076 1.088 1.016 1.022 1.01 1.07 1.076 1.072 1.047 1.016 1.061 1.014 XIXXX := convert(Points 49, 7)No DataCells

= length(XXX)

XXX := deletezero cells(XXX, No DataCells)

Cells 86 := stack(XXX, XXXS) No DataCells

'=length (Cells 86)No DataCells

= 96 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 page := READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trenchl7-3.txt")

Points 49 := showcells(page, 7,0)Sheet No.2of 16 Points 4 9=0.964 1.063 1.021 1.066 1.052 1.037 1.065 1.105 1.012 1.097 1.023 1.037 1.015 1.059 1.083 1.029 1.071 1.006 1.044 1.026 1.026 1.011 1.047 1.068 1.063 1.078 1.064 1.058 1.047 1.056 1.033 1.045 1.05 1.07 1.047 1.016 0.972 0.911 1.035 1.054 1.056 1.067 1.028 0.907 0.952 0.992 1.051 1.044 1.075 XXX := convert(Points 49, 7)No DataCells

= length(XXX)

XXX :=deletezero cells(XXX, No DataCells)

Cells 86 stack(Cells 86, XXX)No DataCells

=length(Cells 86)No DataCells

= 145 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench 17-4.txt")

Points 49 := showcells(page, 7,0)Points 4 9=1.088 1.056 1.102 1.106 1.069 1.097 1.135 1.046 1.045 1.001 1.05 0.965 1.028 1.022 1.019 0.995 1.044 1.002 0.988 1.051 1.076 1.103 1.044 1.082 1.017 1.122 0.951 1.058 0.993 1.042 1.028 1.042 1.034 1.059 0.952 1.086 1.026 1 1 .034 1.032 1.015 0.981 1.041 1.116 1.08 1.037 1.07 1.005 1.023 XXX :=convert (Points 49, 7)No DataCells:=

length(XXX)

XXX :=deletezero cells(XXX, No DataCells)

Cells 86:=stack (Cells 86, XXX) No DataCells

=length(Cells 86)No DataCells

= 194 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.3of 16 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trench 17-5.txt")

Points 49 := showcells( page, 7,0)Points 49 =1.023 1.1 1.053 1.005 0.972 0.985 0.999 1.049 1.017 1.03 1.049 0.985 0.979 0.987 0.987 0.958 1.025 1.006 1.012 0.974 1.021 1.085 1.044 0.987 1.058 1.009 0.961 0.958 1.048 0.991 1.031 1.058 1.067 1.017 0.954 1.072 1.056 1.059 1.011 1.017 1.008 1.064 0.98 1.074 1.087 0.992 0.975 0.982 0.942 XXX := convert(Points 49, 7)No DataCells

= length(XXX)

XXX:= deletezero cells (XXX, No DataCells)

Cells 86 :stack (Cells 86, xxx) No DataCells

=length(Cells 86)No DataCells

= 243 page:= READPRN( "H:\MSOFFICE\Drywell Program data\1986 trenches\Trenchl7-6.txt")

Points 49 := showcells(page, 7,0)Points 4 9=0.923 0 0 0 0 0 0 0.981 0 0 0 0 0 0 0.976 0 0 0 0 0 0 0.97 0 0 0 0 0 0 0.964 0 0 0 0 0 0 0.99 0 0 0 0 0 0 1.004 0 0 0 0 0 0 XXX :=convert(Points 49, 7)No DataCells:=

length(XXX)

XXX:= deletezero cells (XXX, No DataCells)

Cells 86 := stack (Cells 86' XXX)No DataCells

= length (Cells 86)No DataCells

250 The thinnest point at this location is shown below minpoint:

min(Cells 86)minpoint = 889 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.4of 16 Mean and Standard Deviation p86 actual :=mean (Cells 86) p86 actual 1.0239"103 a86 actual "Stdev(Cells 86)a86 actual =45.019 Standard Error a86 actual Standard error No DataCells Standard error = 2.847 Skewness Skewness (No DataCels)X(Cells 86- 186 actual)3 (No DataCells

-1). (No DataCells

-2)' (a86 actual)3 Skewness = -0.387 Kurtosis Kurtosis No DataCells (No DataCells+

1) -(Cels 86- 186 actual)4.(No DataCells

-1) .(No DataCells

-2) .(No DataCells

-3) (a86 actual)4+ ( 3N (No DataCells 1 )2 ( DataCells

-2) (No DataCells

-3)Kurtosis = -0.033 Passport 00546049 07 Sheet No.Tech Eval A2152754 E09 5 of 16 Attachment 3 Normal Probability Plot In a normal plot, each data value is plotted against what its value would be if it actually came from a normal distribution.

The expected normal values, called normal scores, and can be estimated by first calculating the rank scores of the sorted data.j'.=0.. last(Cells

86) srt : =sort (Cells 86)Then each data point is ranked. The array rank captures these ranks rank. '-Xsrt-srt.rank.pJ -rows(Cells 8 86) ÷The normal scores are the corresponding pth percentile points from the standard normal distribution:

x::l N_Scorej :=rootcnorm(x)- (pi), x]

Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Upper and Lower Confidence Values The Upper and Lower confidence values are calculated based on .05 degree of confidence "a" No DataCells:=

length (Cells 86)Sheet No.6of 16 a :=.05 Tax: q{ (I -1) No DataCells Ta = 1.969 o86 actual Lower 95%Con :=p86 actual Tt.a FNo DataCells Upper 95%Con := p86 actual+ Ta. 86 actual 4No DataCells Lower 95%Con = 1.018103 Upper 95%Con = 1.029.103 These values represent a range on the calculated mean in which there is 95% confidence.

Graphical Representation Distribution of the "Cells" data points are sorted in 1/2 standard deviation increments (bins) within +/- 3 standard deviations Bins :=Make bins (p186 actual' 086 actual)Distribution

= hist(Bins, Cells 86)The mid points of the Bins are calculated Distribution

=U 4 5 13 17 30 47 50 44 28 9 3 0 k:=0.. 11 Midpoints (Binsk'" Binsk+ t)2 The Mathcad function pnorm calculates a portion of normal distribution curve based on a given mean and standard deviation normal curve 0 :=pnorm(Bins,, 1186 actual, o86 actual)normal curvek :=pnorm(Binski 1,1g86 actual, a86 actual)- pnorm(Binsk, g186 actual, a 8 6 actual)normal curve :=No DataCells.normal curve Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.7of 16 Results For Elevation Sandbed elevation Locatiobn Oct. 2006 The following schematic shows: the the distribution of the samples, the normal curve based on the actual mean and standard deviation, the kurtosis, the skewness, the number of data points, and the the lower and upper 95% confidence values. Below is the Normal Plot for the data.Data Distribution Distribution normal curve 20-to 900 950 Lower 95%Con = 1.018e103 g86 actual = 1.0240 103 minpoint = 889 Standard error = 2.847 Skewness = -0.387 Kurtosis = -0.033 1150.. I .I j I I I I .I I 1000 1050 1100 Midpoints, Midpoints Upper9 5%Cofl = 1.029*10 3 Y86 actual = 45.019 minpoint = 889 A Kurtosis value which is less than +/- 1.0 and approaches 0 is indicative of a normal distrubution Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Normal Probability Plot Sheet No.8of 16 NScorej xxx 3 2 1 0-1-2-3 x Xx The Normal Probability Plot and the Kurtosis this data is normally distributed.

x-I I I I I 850 900 950 1000 srIt.J 1050 1100 1150 A Normal Probability Plot which approaches a straight line is indicative of a normal distrubution Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Appendix LATER -Sand Bed Elevation ALL OCT 2006 Data The data shown below was collected in 1986 in the trench in Bay 17 page := READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trench1 7-1 .txt")Points 49 := showcells(page, 7,0)Sheet No.9of 16 Points 49 =0.963 0.897 0.855 0.802 0.746 0.702 0.726 0.972 0.937 0.884 0.891 0.795 0.779 0.825 0.877 0.903 0.853 0.838 0.776 0.811 0.878 0.835 0.893 0.85 0.79 0.822 0.835 0.868 0.891 0.838 0.84 1.082 0.757 0.723 0 0.831 0.781 0.814 0 1.042 0.738 0.864 0.894" 0.841 0.788 0.809 0.794 0.837 0.954 XXXS :=convert(Points 49, 7)No DataCells

= length(XXXS)

XXXS := deletezero cells (XXXS, No DataCells) page :=READPRN("H:\MSOFFICE\Drywell Program data\2006 trenchs\Trenchl7-2.txt")

Points 49 := showcells(page, 7,0)Points 4 9=0.997 1.061 1.008 0.988 1.005 0.99 0.954 1.023 0.958 1.021 0.991 1.014 0.976 0.954 1.06 1.022 1.01 0.961 1.003 0.962 0 1.015 1.044 1.01 0.94 0.896 0.909 0.885 0.964 0.991 1.003 1.029 0.944 0.905 0.887 0.995 0.99 0.959 0.979 1.013 0.863 0.877 0.997 1.001 0.963 0.929 0.885 0.923 0.93 XXX:= convert(Points 49, 7)No DataCells

= length(XXX)

XXX := deletezero cells(XXX, No DataCells)

Cells 06 := stack( XXX, XXXS) No DataCells length(Cells 06)No DataCells

= 95 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.10of 16 page := READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trenchl7-3.txt")

Points 49 := showcells(page, 7,0)Points 4 9=0.973 0.998 0 1.017 1.038 0.968 1.028 0.954 0.952 0.978 1.074 1.053 1.028 0.95 1.004 1.007 0.979 0.968 1.026 0.998 1.047 1.013 1 0.935 0.963 1.008 1.017 1 1.011 0.963 1.014 0.966 0.983 1.004 0.977 1.043 1.006 0.981 1.014 0.979 1.03 1.002 0.948 0.951 1.015 1.03 1.039 1.046 1.01 XXX :=convert(Points 4 9 , 7)No DataCells

= length(XXX)

XXX :=deletezero cells (XXX, No DataCells)

Cells 06 :=stack(Cells 0 6 , XXX)NO DataCells length(Cells 06)No DataCells

= 143 page := READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trenchl7-4.txt")

Points 49 := showcells(page, 7,0)Points 49 =0.966 0.987 1.034 0.972 0.975 0.94 0.918 1.069 0.983 1.008 1.021 0.951 0.967 0.897 1.014 0.942 0.971 0.985 0.985 0.895 0.934 1.055 0.941 1.064 0.992 1.059 1.02 1.036 0.995 1.01 0.985 1.003 1.047 1.044 1.058 1.002 1.023 1.022 0.997 0.935 1.075 0.998 1.029 1.016 1.032 1.008 0.98 0.98 1.009 XX-X : =convert (Points 49,7 )No DataCells

"= length(XXX)

XXX :=deletezero cells(XXX, No DataCells)

Cells 06 :=stack(Cells 06' XXX)No DataCells

= length (Cells 06)No DataCells

= 192 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 page READPRN("H\-MSOFFLCE\Drywell Program data\2006 trenchs\Trench 17-5.txt")

Points 49 := showcells(page, 7,0)Sheet No.11 of 16 Points 49 =1.026 1.026 0.979 0.963 1.027 1.023 0.986 0.958 0.906 0.933 1.003 0.977 1.001 1.004 0.958 0.915 1.027 1.016 1.039 0.959 1.009 1.026 0.991 0.934 1.062 0.999 0.997 0.946 0.982 1.006 0.969 0.969 0.998 0.974 1.016 0.988 0.984 0.956 0.987 1.027 1.003 1.023 0.967 0.962 1.042 1.03 1.039 1.09 0.995 XXX :=convert(Points 49,7)No DataCells

= length(XXX)

XXX := deletezero cells(XXX, No DataCells)

Cells 0 6:=stack(Cells 06, XXX)No DataCells

= length (Cells 06)No DataCells

241 page:= READPRN( "H:\MSOFFICE\Drywell Program data\2006 trenchs\Trenchl 7-6.txt")Points 49 "= showcells(page, 7, 0)Points 4 9=0.937 0.924 0.948 0.977 0.972 1.026 0.981 0.97 0.927 1.059 0.934 0.948 0.963 0.983 1.032 0.932 0.977 1.002 0.968 1.006 0.967 0.946 0.941 0.941 0.982 0.973 0.972 0.945 0.932 0.968 0.932 0.983 1.005 0.953 0.968 0.918 0.924 0.937 0.997 0.959 0.964 0.943 0.942 0.916 0.967 0.953 1.028 0.99 0.978 XXX :=convert(Points 4 9 , 7)No DataCells:

length(XXX)

XXX := deletezero cells (XXX, No DataCells)

Cells 06 :=stack(Cells 0 6 ,XXX) No DataCells

=length (Cells 06)minpoint :=min(XXX)

No DataCells

= 290 minpoint = 916 The thinnest point at this location is shown below minpoint :=min(Cells 06)minpoint = 702 Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.12 of 16 Mean and Standard Deviation p06 actual := mean(Cells 06)p06 actual = 962.7897 a86 actual := Stdev (Cells 06) a86 actual = 71.259 Standard Error Standard error a86 actual No DataCells Standard error = 4.184 Skewness Skewness (No DataCells)

I-(Cells 06- p06 actual)3 (No DataCells

-1). (No DataCells

-2). (a86 actual )3 Skewness = -1.252 Kurtosis No DataCells.(NO DataCells

• .) I(Cel°s 06- g06actual)4 Kurtosis (No DataCells

-DataCells

-2)-(No DataCells

-3).(086 4+3 .(No DataCells-1)2-2)(NoDatCells 3)Kurtosis = 1.587 Passport 00546049 07 Sheet No.Tech Eval A2152754 E09 13 of 16 Attachment 3 Normal Probability Plot In a normal plot, each data value is plotted against what its value would be if it actually came from a normal distribution.

The expected normal values, called normal scores, and can be estimated by first calculating the rank scores of the sorted data.j :=O.. last(Cells

06) srt :=sort(Cells 06)Then each data point is ranked. The array rank captures these ranks z , :=j + I rank. :~~st)*Xsrt-srt.rank.p' rows(Ce s 06) + I The normal scores are the corresponding pth percentile points from the standard normal distribution:

x:=I NScorej :=roof cnorm(x)- (pi),x]

Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.14 of 16 Upper and Lower Confidence Values The Upper and Lower confidence values are calculated based on .05 degree of confidence "a" No DataCells

= length(Cells 06)a :=.05 qNo DataCells Ta = 1.968 o86 actual Lower 95%Con := p06 actual -Tt.aýNo DataCells a86 actual Upper 95%Con:= l 0 6 actual+i" Ta FNo DataCells Lower 95%Con = 954.554 Upper 95%Con = 971.025 These values represent a range on the calculated mean in which there is 95% confidence.

Graphical Representation Distribution of the "Cells" data points are sorted in 1/2 standard deviation increments (bins) within +/- 3 standard deviations Bins := Make bins (g-06 actual,,a 8 6 actual)Distribution

= hist(Bins, Cells 06)The mid points of the Bins are calculated Distribution

=M 4 8 13 12 18 49 80 74 23 4 0 0 k:=0.. 11 Midpointsk (Bins'- -Binsk+l)2 The Mathcad function pnorm calculates a portion of normal distribution curve based on a given mean and standard deviation normal curve 0 pnorm (Bins,, pi06 actual, a86 actual)normal curvek pnorm(Binsk+I1, g06 actual, o86 actual) -pnorm(Binsk, ii06 actual, a86 actual)normal curve "= No DataCells'normal curve Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Sheet No.15 of 16 Results For Elevation Sandbed elevation Locatiobn Oct. 2006 The following schematic shows: the the distribution of the samples, the normal curve based on the actual mean and standard deviation, the kurtosis, the skewness, the number of data points, and the the lower and upper 95% confidence values. Below is the Normal Plot for the data.Data Distribution minpoint = 702 Standard error = 4.184 Skewness -1.252 Kurtosis = 1.587 Distribution-L normal curve 700 800 900 1000 1100 Midpoints, Midpoints 1200 Lower 95%Con = 954.554 Upper 95%Con = 971.025 p06 actual = 962.79 o86 actual = 71.259 minpoint = 702 A Kurtosis value which is less than +/- 1.0 and approaches 0 is indicative of a normal distrubution.

Therefore this distribution may not be completely normal. Additional testing will be performed by the normal probability plot.

Passport 00546049 07 Tech Eval A2152754 E09 Attachment 3 Normal Probability Plot Sheet No.16 of 16 3 2 1 I I I I I I I The Normal Probability Plot and the Kurtosis this data is normally distributed.

NScorej xxx 0-I--2h X X (I-3 700 750 800 850 900 Srt.950 1000 1050 1100 A Normal Probability Plot which approaches a straight line is indicative of a normal distrubution.

Based on review of this plot it is concluded that the distribution is normal Corrosion Rate assuming corrosion occured between 1986 and 2006 (1g86 actual -p06 actual) = 3.054 2006- 1986 Corrosion Rate assuming corrosion occured between 1986 and 1992 (p186 actual -p06 actual) = 10.18 1992- 1986 fif07/iL -0 * ;p p General Electric Oyster crk Ultrasonic Thickness Measurement Refuelina Outaee -11R21 Data Sheet-ile Namew NIFA Date:j 102/UT Procedure:I ER-A-335-004 mI IPawe I of 12 I IS-328227-004 Examiner, Leslie Richter Level: II Instrument Type: Panametbics 37DL Plus Examiner.

N/A Level: N/A Instrument No: 031124909 rransducer Type: D795 Serial .104012 Size: 0.200" F q: 5 Mhz Angle: 0" rransducer Cable Type: Panametrics Length: 5' COuplant Soundsafe 1Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number CAL-STEP-OSO

_SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial CaL Time Calibration Checks i Final Cal. Time Coarse Range: 5.,r 11:59 13:00 13:30 14:30 Coarse Delay. N/A Calibrated Sweep Range = 0.5001 Inches to 1.500r Inches Delay Calib: WA Themmmleter 240547 :j Comp. Termp: ar BIlodc Temnp. 79'Range Celib: N/A W/O Number I Instrument Freq. N/A Total Crew Dose d 0o1,lDrpwl Containment Vessel Thickmes ExamInatIon Gain: 74 db 7 i-o(p External UT n!pectons.

Damping:l N/A Reject N/A Fifterl W/A I Bay- 1 I PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT

/PAGE 4 OF 2-j Point mber 1HoriKonal BAY Nme Locton Locadl;onn I 9-E, See Attached for Locations and Thickness Readings------_- -;,i;.,.:-,, .,, -,. .,--.: .:. --. -.'/ ..-:.. ecd9 2 COMMENTS:

Coated surface is rough at all reading points. Unable to slide off of best measurement spot. Plot measurement numbers are more accurate if measuring tape is placed 13" to the right from the center of the weld on the nozzle, then follow down passing through point # 8.A4.LY Reviewed by: Lee Stone -Level II Date 10/22/2006 1AY 0 2006 Point Vertical Horizontal 1992 value I Value Comments I D16 R27 0.720 0.710 2 D22 R17 0.716 0.690 __3 D23 L3 0.705 0.665 4 D24 L33 0.760 0.738 Very Rough Surface 5 D24 L45 0.710 0.680 6 D48 R19 0.760 0.731 7 D39 R7 0.700 0.669 8 b48 RO 0.805 0.783 9 D36 L38 0.805 0.754 10 D16 R23 0.839 0.824 .......11 D23 R12 0.714 0.711 12 D24 L5 0.724 0.722 13 D24 L40 0.792 0.719 14 D2 R35 1.147 1.157 ' _'15 D8 L51 1.156 1.160 16 D50 R40 0.796 0.795 17 D40 R16 0.860 0.846 18 D38 L2 0.917 0.899 19 D38 L24 0.890 0.865 20 D18 R13 0.965 0.912 21 D24 R15 0.726 0.712 22 D32 R13 0.852 0.854 23 D48 ' R15 _0.850 0.828 ... ..Data obtained from NDE Data Sheets 92-072-12 page 1 of 1 NDE Data Sheets 92-072-18 page 1 of 1 NDE Data Sheets 92-072-19 page I of 1 All horizonal measurements taken 13" to the right of the centedine of the reinforcement ring (Boss).All vertical measurements taken from bottom of vent nozzle at the 13" reference line.Surface roughness prohibited characterization of all readings.%U Note: Per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

b -/1a OL 1A.2Z/ cie -0/.2 P3 i r--General Electric File Name: N/A Oyster Creek Ultrasonic Thickness Measurement Date: 10/2006 Refueling Outage -1R21 Data Sheet UT Procedu: ERA- 500 Page 1 of 2 Specification IS-328227-004 Examiner:

Scott Erickson Level: II Instrument Tye: Panametrics 37DL Plus Examiner.

N/A Level:. N/A Instrument No: 031120708 Transducer Type: D7908 Senal t 338302 Size: 0.200(" Fre : 7.5 Mhz Angle: 0" Transducer Cable Type: Panametrics Length: 5' Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number: CAL-STEP-136 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Tiffe Calibration Checks Final Cal. Twoe Coarse Range: 2.0" 22:05 WA WA 23:50 Coarse Delay. N/A Calibrated Sweep Range = 0.500" Inches to 1.50W Inches Delay Calib: N/A Therometer:

246647 I Comp. Temp: 7Ir IBlock Temp: 750 Range Calib: N/A W/O Numberl C2013477 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain:. 54 db Imr ' Exilmul UT Inspections.

• Damping:.

NWA Reject I Bay- 3 Point , Vertical Horizonall Thickness BAY Number Location ..... Location ,Readin See Attached for Locations and Thickness IL.'_Readings 1A 21---A44 w-S COMMENTS:

N/A Reviewed by: Lee Stone Level II Date 10/19/2006 0 0 BAY 3 2006 Point. Vertical Horizontal 1992 value Value Comments 1 D16 R63 0.795 0.795 WA 2 D18 R48 1 0.999 3 017 R33 0.857 0.850 4 D13 L5 0.898 0.903 5 D25 L8 0.823 0.819 6 D15 L56 0.968 0.972 7. 029 R4 0.826 0.816"*_8 D34 L4 1 0.78 0.7641 Data obtained from NDE Data Sheets 92-072-14 page 1 of I Note: Per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

0.N.PASSPORT#00546049 07 AR# A2152754 w09 ATACHNT PAGEA OF N ~)

Wf--r'b I Lig -0 zC I General Electric Oyster Creek I File Name:I NWA Ultrasonic Thickness Measurement:

Data Sheet Refueling Outage -I1R21 Date: 10/20/2006 UT Procedure:

ER-AA-335-004 Specifiction IS-328227-004 mP Paoe I of 2 12I[Examiner Leslie Richter Level: II Instrument Type: Panametrics 37DL Plus Examiner N/AI Level: WA Inst'ument No: 031124909 Transducer Type: D795 Serial .104012 Size: 0.200" Freq: 5 Mhz Angle: 0°Transducer Cable Type: Panametrics Length: 5' ICouplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge T Block Number CAL-STEP-136 SYSTEM CAUBRATION INSTRUMENT SETTINGS Initial Cal. Time JCalibration Checks FiaCl.lm I Coarse Range: 5.0" 15:38 15:51 16:45 17:28 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A Thermometer 246647 I Comp. Temp: 82" IBlock Temp: 76" Range Calib: N/A W/O Number C2013477 Instrument Freq. N/A Total Crew Dose Drywall Containment Vessel Thickness Examination.

Gain: 72 db 2 mr , External UT Inspections.

Damping: N/A Rejed:j INA Filter IN/A I Bay -5 1 COMMENTS:

N/A Reviewed by: Scott Erickso rL ý,, ftAdV\ Level II Date 10/19/2006 1L Nj Ub'T 39WD~7 N I N3 OVJ.LLV 603 t9L9ITV AMV LO 6VO919S00#1JMOdS9Vd BAY 5 2006 Point Vertical Horizontal 1992 value Value Comments* 1 D38 R12 0.97 0.948 up .97 dn .97* 2 D38 R7 1.04 0.955 Rough surface -up .99 dn .99* 3 D42 R10 1.02 0.989 up,1.0 dn 1.04 4 D41 L7 0.97 0.948 Rough surface, also dished* 5 D42 Lll 0.89 0.88 Rough surface_

• 6 D47 R5 1.06 0.981 up 1.018dn 1.014** 7 048 L18 0.99 0.974 Rough surface left .99 right N/A** 8 D46 L31 1.01 1.007 Roughs urface Note: up, dn, left & right readings were taken 1/8" from recorded 2006 valuelreading.

Rough surface limited taking additional readings, Reference above.* =Vertical and horizontal measurements taken from top of coating on long seam 62" to right** =Vertical and horizontal measurements taken from bottom of nozzle at 6 o'clock position Reference NDE Data Sheets 92-072-16 page 1 of 1 1 -Reference off the weld 62" to the right of the centerline of the bay.2 The original data sheet is not clear as to whether this point is to the right or left of the weld.Therefore NDE shall verify this dimension.

Note: per discussion with Engineering, single point readings were taken In lieu of 6, based on surface curvature.

0 i io .2 Y General Electric Oyster Creek Ultrasonic Thickness Measuremeni Data Sheet i File Name:I N/A DOW] I(VIVMW UT Progedure:1 ER-AA-335-004 A iRefueling Outage -1R21 Pawe 1 of 12 I I Speciticatlonl IS-32=27-004-*

Examiner.

Lee Stone cL.. Level: 1 1 Instrument Type: Panametrcs 37DL Examiner.

N/A] Lev: NA Instrument No: 031124909 Transducer Type: D795 SedriaI 1103007 i Size: 0.200I Freq: 5 Mhz Angle: 0r Transducer Cable Type: Panametrics Length: 5! Couplant Soundsafe Batch No: 19620 ECalibration Block Type: C/S Step Wedge j Block Number CAL-STEP-109 SYSTEM CAMBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks I Final Cal. Time Coarse Range: 5.0" 14:20 N/A' N/A 15:10 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A Thermometer:

246737 Comp. Te p: 72" FBIock Terp: 740 Range Calib: N/A W/O Number C2013477 Instrument Freq. N/A Total Crew Dose DIywel Containment Vessel Thickness Examinatln.

Gain: 67 db 12 mr, I External UT Inspections.

Damping: N/A Reject1 N/A Filterl N/A IBay -7 .I a I'-.Z 2Iw 04;1 COMMENT8:,WhKr Reviewed by: Kimberly Wert.~6a ~ ~ a Level 11 Date 10/19/2006 BAY 7 2006 Point Vertical Horizontal 1992 value Value Comments 1 D21 R39 0.92 N/A Could not locate area 2 D21 R32 1.016 NIA Could not locate area 3 D10 R20 0.984 0.964 up/dn ranged from 0.956 to 0.980 4 D10 RIO 1.04 1.04 , 5 D21 L6 1.03 1.003 up/dn ranged'from 1.000 to 1.049 6 DIO L23 1.045 1.023 ,up/dn ranged from 1.020 to 1.052 7 D21 L12 a 1 1.003 up/dn ranged from 1.002 to 1.026 Data obtained from NDE Data Sheets 92-072-20 page 1 of 1 Note: up, dn readings were taken 1/8" from recorded 2006 value reading.PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT

%'PAGEJ..OF OF 2406

/,~~2Itr<-oGL.

4 General Electric File Name: N/A OysterCreek Ultrasonic Thickness Measurement Daft: /lI/2=l Refueling Outage -1 R21 Data Sheet UT Procedure:

EAA 04 Page 1 of 2 Specification IS-328227-04X Examiner.

Scott Erickson Level: II Instrument Type: Panametrics 37DL Plus Examiner N/A Level: N/A Instrument No: 031120708 Transducer Type: D7908 Sedal t 338302 Size: 0.200( Fre : 7.5 Mhz le: 0" Transducer Cable Type: Panametrcs Length: 5' Couplant Soundsafs Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number CAL-STEP-080 SYSTEM CALIBRATION INSTRUMENT STINGS Initial Cal. Time Calibration Checks Final Cal. Tum Coarse Range: 2.0" 22:05 NIA N/A 23:50 Coarse Delay: NWA Calibrated Sweep Range = 0.500' Inches to 1.500" Inches Delay Calib: N/A Thermomneter 246737 I Comp. Temp: 74r IBlock Temp: 72" Range Calib: N/A W/O Number C2013477 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 61 db ta r External UT Inspections.

Damping: N/A Rejectl N/A ( _Bay_-_9 Fifter N/A I y Point ' .Vertical Horizonal Thicknes BAY Number Location ocatio Read t -r -i II See Attached for Locations and Thickness

.Readings -COMMENTS:

N/A Reviewed by: Lee Ston e Level Ii Date 10/19/2008 0 BAY 9 2006 Point Vertical Horizontal 1992 value Value Comments 1 D29 R32 0.96 0.968 4L/A 2 D18 R17 0.94 0.934 3 D20 R8 0.994 0.989 4 D27 R15 1.02 1.016 5 D35 L5 0.985 0.964 6 D13 L30 0.82 0.802 7 D16 L35 0.825 0.82 8 D21 L38 0.791 0.781 -9 D20 L53 0.832 0.823 10 D30 L8 0.98 0.955 1_/Data obtained from NDE Data Sheets 92-072-22 page 1 of 1 Note: per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

6 0 0'-p 0¶

/47/A-,0 ej(G 9 9 I General Electric Oyster Creek Refueling Outage -IIR21 File Name: WA Ultrasonic Thickness Measurement Data Sheet Datel E10/2O/2 UT Procedure:

ER-AA-335-004

-Ik W1 paws ¶o 12 Specificationt IS-328227-004 m Examiner:

Graham McNabb Level: II Instrument Type: Panametrics 37DL Plus Examiner.

N/A Level: N/A Instrument No: 031124909 Transducer Type: D795 ISerial .104010 Size: 0.200" Freq: 5 Mhz Angle: 0°Transducer Cable Type: Panametncs Length: 5' Couplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number CAL-STEP-080 SYSTEM CAUBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks =Final Cal. lime Coarse Range: 5.0" 2:15 NA 515 Coarse Delay:. N/A Calibrated Sweep Range =- 0.500" Inches to 1.500" Inches Delay Calib: N/A , 2r4omet8r4534 Comp. Temp: 740 c Ternp 72 Range Callb: N/A W/O Number C2013477 Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 58 dbi a External UT Inspections.

Damping: WA Reietj N/AJ Fifterl NZ I Bay -11I COMMENTS:

N/A Rt'L ,0 /C2-, C(0 Reviewed by. Scott Erickson ($'0-t ? jLMLoh Level 11 Date 10/t20/2006 BAY 11 2006 Point Vertical Horizontal 1992 value Value Comments 1 D20 R29 0.705 0.700 ,VI 2 D25 R32 0.77 0.760 3 D21 L4 0.832 0.830 4 D24 L6 0.755 0.751 5 D32 L14 0.831 0.823 6 D27 L22 0.8 0.756 7 D31 R20 0.831 0.817 8 D40 R13 0.85 0.825 1 /Data obtained from NDE Data Sheets 92-072-10 page 1 of 1 Note: per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

---

I Y p General Electric Oyster Creek Refuelinc Outage -1IR21 I File Name: I NIA Ultrasonic Thickness Measuremeni Data Sheet Date: 10/19/2006 UT Procedure:

ER-AA-335-004 nU Page 1 of 12 Specificationi IS-328227-004 Examiner Scott Edckson ,,** k. FLk -Level: 11 Instrument Type: Panametdcs 37DL Plus ExaminerW.

N/A LInstrument No: 031120708 Transducer Type: D799 7 eial t 104044 Size: 0.312" Freq: 5 MhW Angle: 0°Transducer Cable Type: Panametrics Length: 5 _Couplant-Soundsafe Batch No: 04120B Calibration Block Type: C/S Step Wedge Block Number-. CAL-STEP-109 SYSTEM CAUBRATION INSTRUMENT SETTINGS Initial Cal. TieCalibration Checks I Final Cal. Time Coarse Range: 5.0" 3:00 N/A N/A 4:15 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calb: N/A Thermorneter 246737 I Comp. Temp: 72" IBlock Temp: 70" Range Calib: N/A W/O Number. C2013477 Instrument Freq. N/A Total Crew De Drywell Containment Vessel Thickness Examination.

Gain: 51 db 0 mr External UT Inspections.

Damping: N/A Reject N/A FitterjI N/A iBay-13 1 COMMENTS:

N/A' 'L LZ-- Reviewed by: Lee Stone 6L : Level II Date 10/19/2006 0 BAY 13"ý 2006 Point Vertical Horizontal 1992 value Value Comments 1 U1 R45 0.672 N/A Could not locate area 2.U1 R38 0.729 N/A Could not locate area 3 D21 R48 0.941 0.923 1 _4 D12 R36 0.915 0.873 " _-5 D21 " RS 0.718 0.708 " _-6 D24 L8 0.655 0.658 " 7 D717 L23 0.618 0.602 8 D24 L20 0.718 0.70411 9 D28 R41 0.924 0.915_ 10 D28 R12 0.728 0.741.....11 0D28 L15 0.685 0.669 i 12 D28 L23 0885 0.886______ 13 D18 D40 0.932 0.814 14 D18 R8 0.868 0.870 15 D20 LO 0.683 0.666 16 D20 L29 0.829 0.814 °17 D9 R38 0.807 N/A Could not locate area 18 022 R38 0.825 N/A Could not locate area 19 D37 R38 I.. 0.912 0.916"4 Data obtained from NDE Data Sheets 92-072-24 page 1 of 2 Note: per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

0 I?( "ý 4 0 /0-IZ? -0 (40 PASSPORT#00546049 07 lAR# A2152754 E09 ATFACHMENT

'PAGE .1 OF -kL e 1~

/.0'01 0 /5-Y Y -I General Electric J I-ile Name: WA Dyster Creek Ultrasonic Thickness Measurement Data Sheet Date: 10/20/0[UT Procedure:

IER-AA-335-004 Refueling Outage -I1R21 Pa, I of 12 I I.Specification IS-328227-004 Examiner:

Matt Wilson i ILevel: 11 lInstrument amerc37LPu Examiner.

N/A Level: N/A linstrument No. 031124709 Transducer Typie: D795 ISerial #: 1103008 Size: 0.20"iW Freq: 5 Mhz I An fle: 0'Transducer Cable Type: Panametrics Length: 5 ICouplant Soundsafe Batch No: 19620 Calibration Blocc Type: C/S Step Wedge Block Number CAL-STEP-088 SYSTEM CALIBRATION INSTRUMENT SETrINGS Initial Cal. Time Calibration Checks Final Cal. lime Coarse Range: 5.0" 10:30 12:10 12:33 13:05 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A Thermometer 246484 A Comp. Temp: 82 IBlock Temp: 76" Range Calib: N/A W/O Number C2013477 Instrument Freq. N/A Total Crew Dose Drywell ContaInment Vessel Thickness Exammination.

Gain: 67 db 2 mr I External UT Inspections.

Damping: N/A Rejectj N/A Filter. N/A I Bay -15 I Point Vertical , Horizonal Thicknem BAY Number .Location Location Redin 4 Ulu-o4~See Attached for Locations and Thicknem Readings Ell....... ...., qV------t~L ~ 1 1 if I-I I-I- I 1. 1 .1-_- -_ _I-t t -I I-l -1'-4 I 'I..............................................

....... ..+.....I I z HI!:1-;!7

." COMMENTS:

N/A Reviewed by: Lee Stone Level II Date 10/20/2006 BAY 15 2006 Point Vertical Horizontal 1992 value Value Comments 1 D12 R26 0.786 0.779 0.711 to 0.779 2 D22 R21 0.829 0.798 0.777 to 0.798 3 D33 R17 0.932 0.935 4 D30 R7 0.795 0.791 5 D26 L3 0.85 0.855 0.817 to 0.855 6 D6 L8 0.794 0.787 0.715 to 0.787 7 D26 L18 0.808 0.805 8 D20 L36 0.77 0.760 -9 D36 L44 0.722 0.749 0.720 to 0.749 10 D24 L48 0.86 0.85210.837 to 0.852 11 D24 L65 0.825 0.84310.798 to 0.843 Data obtained from NDE Data Sheets 92-072-21 page 1 of 1 Note: scanned 0.25" area around recorded 2006 value number -see comments for ranges.PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT q PAGE p, OF J.+/-9-)0

"~-r'"- I P LIZ-0t 9 Y Y General Electric Oyster Creek Refueling Outage -1IR21 I File Name:I N/A Ultrasonic Thickness Measuremeni Data Sheet SDate: 10/i 12006 UT Procedure:

ER- -335-004 I Specification IS-328227-004 Pase 1 of 12 Examiner Matt Wilson ' Level: II Instrument Type: Panametrcs 37DL Plus Examiner N/A Level: N/A Instrument No: 031124709 Transducer Type: D795 Seral 104010 Size: 0.200"I Freq: 5 Mhz T Angle: 0°Transducer Cable Type: Panametrics Length: 5' ICouplant.

Soundsafe IBatch No: 19620 Calibration Block Type: C/S Step Wedge I Block Number CAL-STEP-088 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. TiTm Calibration Checks = Final Cal. Time I Coarse Range: 5.0" 15:38 N/A N/A 17:18 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A ermomneter 246534 I Comp. Temp: 82" Block Temp: 780 Range Calib: N/A W/O Number: C2013477 F Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 67 db 2mr External UT Inspections.

Damping: N/A Reject N/A Filter I N/A I Bay -17 1 Point Vertical .Horzonal Thickness BAY Number Location .. Location -,-,,- -R Ad-See Attached for Locations and Thickness

" Readings_____________.:___;_,_._____

A 3 r-w 14:%a si.te r- z C41 0 L'w0j V 'a d win 04 Lgjý 4 444 COMMENTS:

N/A Reviewed by: Scott Erickson E A VS., Level II Date 10/19/2006 I 0 ~N AO :7 3OVd SJNUKHOVJ.LV 603 *9LUSM~ #WV LO 6t09S00 BAY 17 #LUOdSSVd Note: measurement*om vent pipe CL to floor 60" 2006 Point Vertical Horizontal 1992 value Value Comments 1 D12 R50 0.916 0.909 i__2 D9 R40 1.150 0.681 up .705 dn .663 3 D16 R26 0.898 0.894 4 D34 R24 0.951 0.963 i 5 D6 R20 0.913 0.822_6 D17 R7 0.992 0.909 .. ...7 D18 L14 0.970 0.970 .........8 D34 L46 0.990 0.960 _9 D21 L29 0.720 0.970 10 D3 L2 0.830 0.844'11 N/A NIA N/A N/A ......Note: Down measurements taken from bottom of boss which is 18" below vent line.Locations 8,9, & 3 look to be un-prepped flat areas of the original surface.All left, right measurements taken from 8" left of liner long seam Data obtained from NDE Data Sheets 92-072-08 page I of I Note: Per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

020 I Y -020 General Electric Oyster Creek Refueling Outage- IIR21 File Name:I WA Ultrasonic Thickness Measurement Data Sheet Date:1 10/22/2006 LUT Procedure:I ER-AA-335-004 m-Paos 1 of 2;: Specificationi IS-328227-004 Examiner:

Matt Wilson J Level: 1, Instrument Type: Panametrics 37DL Plus Examiner.

N/A Level: N/A lnstrument No: 031124709 Transducer Ty: D795 ISerial 104010 size: 0.2o0" I Fr: 5 Mhz I Angle: 0" Transducer Cable Type: Panametrics Length: 5! ICouplant Soundsafe Batch No: 19620 Calibration Block Type: C/S Step Wedge I Block Number. CAL-STEP-08 SYSTEM CALIBRATION INSTRUMENT SELTINGS Initial Cal. rime Calibration Checks Final Cal. Time Coarse Range: 5.0" 14:26 15:36 N/A 16:09 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A Thermometer.

246534 T-.1[ Comp. Terrmp: 82" IBlock Temp: 82 Range Calib: N/A W/O Number.Instrument Freq. N/A Total Crew Dose Drywell Containment Vessel Thickness Examination.

Gain: 67 db, 7 mr External UT Inspections.

Damping: N/A Reject: N/A Bay- 19 Fifterl N/A A_______________

Point Vertical Horizonal w Thlckness BAY Number .Location-'

Location Reading-" -See Attached for Locations and Thicknem I- zL Readings HMI0 COMMENTS:

N/A Revewe bf:Le ton I ate 1022/0L 0 BAY 19 2006 Point Vertical Horizontal 1992 value Value Comments 1 D30 R60 0.932 0.904 up .897 dn .867 2 D52 R58 0.924 0.921 up .850 dn .907 3 D33 R40 0.955 0.932 up .894 dn .905 4 D32 R11 0.94 N/A Could not locate area 5 D31 R3 0.95 0.932 up .883 dn .897 6 D52 L65 0.86 N/A Could not locate area 7 D54 LIO 0.969 0.891 up .821 dn .912_ _8 D16 R64 0.793/0.953

• • • 0.745 up.721 dn.747 9 D18 R12 0.776 0.780 up .728 dn.745 10 D19 RO 0.79 0.791 up .736 dn .846 11 20D L18 N/A 0.738 up .738 dn .712 -Data obtained from NDE Data Sheets 92-072-05 page 1 of 1 NDE Data Sheets 92-072-07 page 1 of I Note: Per discussion with Engineering, single point readings were taken in lieu of 6, based on surface curvature.

• • • -This value is not clear form the original datasheet -NDE to verify this value.Note: per discussion with Engineering, singlA noAi-madinas were taken in lieu of 6, based on surface curvature.

(1 1 (L/ 1/C(Xýýýý4474--Iolzzla PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT

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SEE DETAIL--o 0 CROSS SECTION AREA OF TRENCH KEY I (SCALE, V-" Z.z -*1K-to A AR# A21 52754 E09/M .dipG _////D 11 62cje & 6 momoý0 /0 lz .0*-Ir PASSPORT#1 00546049 07 AR# A2152754 ATTACHMENT f9 PAGE OF (t1~' -

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-PAGE _-5 OF IPA-rA 11 I 16se-.t F It F ~O. L-0%1 9 -I, Gi, I a//000 go lk A2156754 E09 Attachment 6 Corrosion Under Inside Under NDE Data Corrosion Rate Rate Under Corrosion Rate in Bay Point Vertical Horizontal ,Wetted 1992 value S 2006 Value 19 to 2006 floor above Wetted Area Floor Concrete 00 lorabv WtedAe Concrete Wetted Area] 6 D48 R16 Yes Yes 0.76 IR21LR-022 0.731 2.071 2.071 7 D39 R5 Yes Yes 0.7 IR2ILR-022 0.669 2.214 2.214 8 D48 RO Yes Yes 0.805 IR21LR-022 0.783 1.571 1.571 9 D36 L38 Yes 0.805 IR2ILR-022 0.754 3.643 3.643 1 16 D50 R40 Yes Yes 0.796 IR21LR-022 0.795 0.071 0.071 1 17 D48 R16 Yes Yes 0.86 IR2ILR-022 0.846 1.000 1.000 1 18 D38 L2 Yes 0.917 IR21LR-022 0.899 1.286 1.286 1 19 D38 L24 Yes 0.89 IR21LR-022 0.865 1.786 1.786 1 22 D32 R13 Yes 0.852 IR21LR-022 0.854 -0.143 1 23 D48 R15 Yes Yes 0.85 IR21LR-022 0.828 1.571 1.571 5 1 D40 R13 *1 Yes Yes 0.97 IR21LR-019 0.948 1.571 1.571 5 2 D42 R3 *1 Yes Yes 1.04 IR2ILR-019 0.955 6.071 6.071 5 3 D44 RIO *1 Yes Yes 1.02 IR21LR-019 0.989 2.214 2.214 5 4 D44 R/L7 -1 *2 Yes Yes 0.97 IR21LR-019 0.948 1.571 1.571 5 5 D46 R/LII *1 *2 Yes Yes 0.89 IR21LR-019 0.88 0.714 0.714 5 6 D44 L4 Yes Yes 1.06 IR21LR-019 0.981 5.643 5.643 13 7 D48 L24 Yes Yes 0.99 IR21LR-019 0.974 1.143 1.143 5 8 D46 L28 Yes Yes 1.01 IR21LR-019 1.007 0.214 0.214 9 5 D36 L4 Yes 0.985 92-072-22 Page 1 0.964 1.500 1.500 fo 5 9 8 D22 L45- Yes Yes 0.791 92-072-22 Page 1 0.781 0.714 0.714 fo 8 11 5 D32 L14 Yes 0.831 92-072-10 page 1 0.823 0.571 0.571 of 4 it 6 D27 L22 Yes 0.8 92-072- 10 page 1 0.756 3.143 3.143 of 5 11 7 D31 R20 Yes 0.831 92-072-10 page 1 0.817 1.000 1.000 of 6 1 8 D40 R13 Yes Yes 0.85 92-072-10 page I 0.825 1.786 1.786 of 7 13 9 D28 R41 Yes 0.924 92-072-24 page 1 0.915 0.643 0.643_ 1__ 1of_10 1 Page 1 A2156754 E09 Attachnent 6 Under Corrosion Under Inside NDE Data Corrosion Rate Rate Under Corrosion Rate in Bay Point Vertical Horizontal Wetted 1992 valne Shet192to206 fooVaoeletueAe Floor Concrete Sheet 192 to 2006 floor above Wetted Area Wetted Area 13 10 D28 R12 Yes 0.728 92-072-24 page I 0.741 -0.929 of 11 13 11 D28 L15 Yes 0.685 92-072-24 page 1 0.669 1.143 1.143 of 12 15 3 D33 R17 Yes 0.932 IR21LR-015 0.935 -0.214 15 5 D26 L3 Yes 0.85 IR21LR-015 0.855 -0.357 15 9 D36 L40 Yes 0.722 IR21LR-015 0.749 -1.929 17 3 D32 R28 Yes 0.898 IR21LR-021 0.894 0.286 0.286 17 4 D52 R30 Yes Yes 0.951 IR21LR-021 0.963 -0.857 17 5 D36 R12 Yes 0.913 IR21LR-021 0.822 6.500 6.500 17 6 D52 L6 Yes Yes 0.992 IR21LR-021 0.909 5.929 5.929 17 7 D36 L26 Yes 0.97 I R21LR-021 0.97 0.000 17 8 D52 L40 Yes Yes 0.99 IR21LR-021 0.96 2.143 2.143 0.000 19 2 D52 R66 Yes Yes 0.924 IR21LR-020 0.921 0.214 0.214 19 3 D33 R49 Yes 0.955 IR21LR-020 0.932 1.643 1.643 19 4 D32 RII Yes 0.94 IR21LR-020 Not Located 19 5 D53 R2 Yes Yes 0.95 IR21LR-020 0.932 1.286 1.286 19 6 D52 L65 Yes Yes 0.86 1R21LR-020 Not Located 19 7 D39 L12 Yes Yes 0.969 IR21LR-020 0.891 5.571 5.571 Page 2 Bp!i M i Minimum Rate Maximum Rate Average Rate 0.286 6.500 2.280 0.071 6.071 2.334 Minimum Thickness Recorded in 2006 0.669 Assuming a maxhimum corrosion rate of 6.5 MPY and an uncertaintly of 20 mils the 0.669 location will thin to the following in 2008 Assuming a Aveeage corrosion rate of 2.3 MPY and an uncertaintiy of 20 mils the 0.669 location will thin to the following in 2008 0.636 0.644

/dgln.,-03.2 0% Vio- "' d'-General Electric Report Number. 1R21LR- 3 L.O0ster Creek Ultrasonic Thickness Measurement Date: 10/26/2006 Refueling Outage -1 R21 Data Sheet UT Procedure:

ERAA335--004 Page 1 of 2 j --,Specification:

IS-328227-004 Examiner Leslie Richter ...- Level: II Instrument Type: Penametrics 37DL Plus Examiner N/A Level: N/A Instrument No: 031125409 Transducer Type: DV 506 Serial #: 072561 Size: 0.438" Fre : 5 Mhz Angle: 0°Transducer Cable Type: Panametrics Length: 5! Couplant:

Soundsafe 1Batch No: 19620 Calibration Block Type: C/S Step Wedge Block Number. CAL-STEP-136 SYSTEM CALIBRATION INSTRUMENT SETTINGS Initial Cal. Time Calibration Checks = Final Cal. Time Coarse Range: 2.0" 9:20 9:35 -9:38 10:00 Coarse Delay: N/A Calibrated Sweep Range = 0.500" Inches to 1.500" Inches Delay Calib: N/A Thermometer 246647 BEComp. Temp: 68" TBlock Temp: 65" Range Calib:. N/A W/O Number G29484; I eO, 137-7-.0 7-Instrument Freq, N/A Total Crew Dose Drywall Containment Vessel Thickness Examination.

Gain: 55 db 45 mr Internal UT Inspections.

Damping: N/A Reject: N/A Trench I Bay 5 Extended Grid Data Filter N/A Original A01 Grdd The UT transducer was positioned in the same Location.orientation at each grid point_Area extended deeper Into Trench Trench I B Elev. 10'30 6 1.182 1.145 1.088 1.085 1.088 1.083 1.060 6 5 1142 1.106 1.070 1105 1.094 1.077 1.084 5 4 1.7 1.070 1.083 1085 1.125 1.087 1059 4 3 1.161 1.133 1.131 1.127 1.094 1.060 1.052 3 2 1.15 1.52 1.142 1-138 1.130 1J13 1.01 4 2 Expanded A01 Grid 1 111 1.142 1.142 125 1.144 1.1381 1.14 Loain G F E C 8 A*Min Readn Max Reading COMMENTS: The removal of concrete from trench exposed six more inches of liner. The template was placed below previous grid location with the centerline of the top row 1" +1- 1/16" from previous grid bottom row. The holes were painted on the liner using the 8"x 8" template, readings were then taken with template removed.An area approximately 14"x 6" of extended trench area was scanned 100% with the minimum reading of 1.047" and a maximum reading of 1.150" recorded.The 100% scan Inspection was performed using a D799 (Serial # 104141) transducer and the grid points inspection was preformed using a DV 506 transducer.

A "V" was stamped above grid point 6D.Reviewed by: Lee Stone ., PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT

_7 C. ~7 ,,MW c ( ,0. Z (", C-a7 PASSPORT#OO546049 07 AR# A2152754 E09 A1"IACHMENT

?PAGE _,2IOF PASSPORT#00546049 07/ AR# A2152754 09 ATTACHMENT PAGE OF Exe Memorandum Asset Management

1. AM-2006-01 I Revision 2 Date: October 31, 2006 To: Howie Ray Peter Tamburro cc: Roman Gesior Richard Hall From: Steve Leshnoff

Subject:

Final Report of the Third Party Independent Review of Oyster Creek Drywell Containment Corrosion Evaluation in Bay 5 and Bay 17 Trenches The purpose of this memo is to document the independent third party review (ITPR)of the Oyster Creek (OC) Drywell Containment Corrosion Evaluation in Bay 5 and Bay 17 Trenches and to provide you with the results related to that review. The review was performed in accordance with Training & Reference Material (T&RM)HU-AA-1212, Revision 1, Technical Task Risk/Rigor Assessment, Pre-job Brief, Independent Third Party Review, and Post-Job Brief.Purpose of the Review Ultrasonic Testing (UT) measurements of the drywell thickness at and below the interior floor at the elevation of the sand bed were obtained during OC 1 R21 Refueling Outage. The intent was to complete the assessment of the potential for on-going corrosion both above and below the drywell floor. The purpose of this review is to establish that the appropriate statistical methods were used to evaluate the data and that the correct conclusions were drawn from the statistical evaluation of the data.Scope of Review I performed a detailed review of the statistical methods that were used in the evaluation of the UT measurements.

The evaluation included the following steps, each of which was reviewed: " Establish that the UT data from a measurement template was normally distributed using the kurtosis tests* Derive the standard deviation and standard error for each of the data distributions

& Derivation of the 95% confidence intervals for the data.Ilam.luclear Page 1 of 2 PASSPORT#00546049 07 AR# A2152754 E09 ATTACHMENT

_agement # /A2006-011 P A G E 1 .O Fe v is io n 2 1* Determination of the lower range of the calculated mean thickness for which there is 95% confidence.

• Calculation of the apparent corrosion rate on an average basis in the trench in Bay 5 and on a point-for-point basis in the trench in Bay 17 below the water level Limitations There were no limitations to this review.Conclusions All of the statistical tests and steps were appropriate and necessary and were applied correctly.

The apparent corrosion rate is minimal. Revieien Revision D to Technical Evaluation A2152754 E09 impacts only the narrative description of the UT data collection activities and includes added-added detailed discussion in the conclusion without ,edifieat*emodification.

Comments Refer to Attachment A for technical comments and resolution to those comments.The comments did not warrant an Issues Report.Page 2 of 2 PASSPORT#00546049 07 AR# A2152754 E09 ATrACHMENT A PAGE -.) OF 2 AM-2006-011 Revision 1 ATTACHMENT A REFERENCE DOCUMENT NO. /REV: OC Drywell Containment Corrosion Evaluation in Bay 5 and Bay 17 Trenches ACCEPTANCE OF COMMENTS RESOLUTION RESOLUTION, 1 Please define the quantitative acceptance I've defined acceptance Resolution Accepted criteria for determining that the data criteria a for normal distribution is normally distributed using the distribution as a Kurtosis kurtosis test (<1.0). value less than +/-1 or a normal distribution plot which approaches a straight 1.ine' I've revised attachment 2 pages 16 and 17 and attachment 3 pages 15 and 16 accordingly.

2 Please include in the discussion of the I've revised the summary Resolution Accepted results that the apparent corrosion rate is pages for the trench data computed at a 95% confidence interval, comparison, to state that the calculated 1986 and 2006 average thickness values have a 95% confidence.

3 4 5 6 7 8 9 10 END S. Leshnoff 10/27/06 Peter Tamburro 10/27/06 SUBMITTED BY DATE RESOLVED BY DATE Page 1

• MPR ASSOCIATES INC.4N G R N E E I S Privileged and Confidential November 3, 2006 Mr. F. Howie Ray PASSPORT#M r Mh/Stt DesignH00546049 07 Manager, c rehS tD n AR# A21 52754 E09 Oyster Creek Generating Station ATTACHMENT

.AmerGen Energy Company, LLC PAGE .L OF ..U.S. Route P _9 Forked River, NJ 08731-0388

Subject:

Third Party- Independent Review of OysterCreek Drywell Water Evaluation

Dear Mr.,

Ray: MPR has completed a HU-AA-1212 Independent Third Party Review of the Oyster Creek drywell evaluation concerning standing water found in drywell shell inspection trenches in thej 10' 3" concrete floor in the drywell. This review included the following documents:

• Technical Evaluation A/R A2152754 E06, with attachments,.

• Technical Evaluation A/R A2152754 E09, with attachments:.

• ECR 06-00879 Based on: this review, we generated two comments, one concerning reported local waillthinning in Bay 17 possibly exceeding limiting dimensions for beiig considered, local, and one concerning the relatively low pH value (and possible corrosivity) of trench/drywell gap water during outages when the migration of CRD water through the concrete pad, to the inspection trenches and.drywell wall, occurs. These were transmitted to you via emailfon November 2. Both comments have been resolved as follows: " Local wall thinning in Bay 17: Technical Evaluation A/R A2152754 E09 has been revised to include another local thinning acceptance criterion documented in Oyster Creek calculation C-1302-187-5320-024.

The UT measurements of concern meet this acceptance criterion and this issue is considered resolved.,* Characterization of the water in the drywell: Section 2.8 of Technical Evaluation A/R A2152754 E06 has been revised to clarify the following points: Any subsequent water (such as reactor coolant) entering the concrete floor-to-drywell gap will increase in pH- due to its: migration through and contact with the concrete.

This will. reduce its corrosivity compared to neutral pH water.320 KING STREET ALEXANDRIA.

VA 22314-3230 703-519-0200 FAX: 103-51"224 httplhvwwýmpucom Mr. F. Howie Ray-2-November 3, 2006-The corrosion of drywell steel surfaces in contact with gap water is expected to occur only during outages when oxygen is present. Corrosion during operation is expected to be almost nil since the drywell operates inerted and no oxygen is present to drive the corrosion reaction.

During outages, shell corrosion losses in the gap are expected to be small since the exposure time is very limited and the water pH is expected to be relatively high.-The expected low corrosion losses in the concrete-to-drywell gap area have been confirmed by examination of steel surfaces in the trenches which has revealed only superficial corrosion of the drywell shell.With the resolution of these concerns, we consider that the Technical Evaluations and attachments successfully address:* The structural integrity of the concrete and drywell shell,* The adequacy of repairs, and the effect of the repairs on the assumptions or inputs used for safety and other analyses, and The impacts of past water migration and current repairs on design and the licensing bases.We also reviewed the technical bases for the Technical Evaluation and conclude that all inputs are accurate or conservative, assumptions are conservative, chemical analysis results are used appropriately, and corrosion evaluations are correct and results used accurately.

Please let me know if you have any questions about this letter.Sincerely, J. E. Nestell, PhD PASSPORT#00546049 07 AR# A2 152754 E09 ATTACHMENT I PAGE-:)F 2