ML051820391

to SG-SGDA-05-24, Condition Monitoring & Operational Assessment: GL-95-05 Alternate Repair Criterion End of Cycle 6 90 Day Report, Watts Bar Unit 1.

ML051820391
Person / Time
Site:	Watts Bar
Issue date:	06/30/2005
From:	Thomas Magee Westinghouse
To:	Office of Nuclear Reactor Regulation, Tennessee Valley Authority
References
SG-SGDA-05-24, Rev 1
Download: ML051820391 (88)

Text

Westinghouse Non-Proprietary Class 3 SG-SGDA-05-24 June 2005 Revision 1 Condition Monitoring and Operational Assessment:

GL-95-05 Alternate Repair Criterion End of Cycle 6 90 Day Report Watts Bar Unit 1 Prepared for the Tennessee Valley Authority Westinghouse

WESTINGHOUSE NON-PROPRIETARY CLASS 3 SG-SGI)A-05-24 Revision 1 Tennessee Valley Authority Condition Monitoring and Operational Assessment:

GL-95-05 Alternate Repair Criterion End of Cycle 6 90 Day Report Watts Bar Unit 1 Author's Name Signature / Date For Pages Thomas P. Magee Official Recorrd Electronicallv Approved in EDMS All Verifier's Name Signature / Date For Pages David J. Ayres Official Record ElectronicallvApproved in EDMS All Manager Name Signature /Date For Pages Earl P. Morgan Official Record ElectronicallyApproved in EDMS All This report has been prepared by Westinghouse Electric Company LLC and bears a Westinghouse Electric Company copyright notice. You are permitted to copy and redistribute all or portions of the report; however all copies made by you must include the copyright notice in all instances.

Westinghouse Electric Company LLC P.O. Box 355 Pittsburgh, PA 15230-0355 o2005 Westinghouse Electric Company LLC All Rights Reserved

iii TABLE OF CONTENTS TABLE OF CONTENTS.........................................................................................................iii LIST OF TABLES ................. iv LIST OF FIGURES .................. v Glossary of Acronyms ................... vi 1.0 Introduction .1-1 2.0 Summary and Conclusions .2-1 3.0 EOC-6 Inspection Results .3-1 3.1 Voltage Distributions at EOC-6 .3-1 3.2 Voltage Growth Rates for Cycle 6 .3-18 4.0 Analysis Methods and Data Base for ARC Correlations .4-1 4.1 Tube Material Properties .4-1 4.2 Burst Correlation .4-1 4.3 Leak Rate Correlation .4-2 4.4 Probability of Leak Correlation .4-3 4.5 NDE Uncertainties .4-3 4.6 Upper Voltage Repair Limit .4-3 4.7 Probe Wear .4-4 5.0 Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 .5-1 5.1 Analysis Approach .5-1 5.2 EOC-6 Burst Probabilities and Leak Rates .5-6 5.3 Comparison with Acceptance Criteria and Prediction .5-7 6.0 Operational Assessment: TUBE Leak} Rate and Burst Probabilities at EOC-7 .6-1 6.1 Analysis Approach .6-1 6.2 POD .6-1 6.3 Voltage Growth Rates for Cycle 7 .6-3 6.4 Prediction of Voltage Distributions at EOC-7 .6-3 6.5 Prediction of Tube Leak; Rates and Burst Probabilities at EOC-7 .6-10 6.6 Comparison with Acceptance Criteria .6-10 7.0 References .7-1 Appendix A ....... A-1 Table of Contents June 2005 SG-SGDA-05-24 Revision 1

iv LIST OF TABLES Table 3-1: Inspection Results for SG 1 EOC-6 ............................................................ 3-2 Table 3-2: Inspection Results for SG 2 EOC-6 ............................................................ 3-3 Table 3-3: Inspection Results for SG 3 EOC-6 ............................................................ 3-4 Table 3-4: Inspection Results for SG 4 EOC-6 ............................................................ 3-5 Table 3-5: Voltage Changes from EOC-5 to EOC-6, SG 1..................................................... 3-19 Table 3-6: Voltage Changes from EOC-5 to EOC-6, SG 2 ..................................................... 3-20 Table 3-7: Voltage Changes from EOC-5 to EOC-6, SG 3..................................................... 3-21 Table 3-8: Voltage Changes from EOC-5 to EOC-6, SG 4 ..................................................... 3-22 Table 3-9: Voltage Changes from EOC-5 to EOC-6, Bound of All SGs ................................. 3-23 Table 3-10: Indications at FDBs............................................................ 3-24 Table 4-1: Burst Correlation ............................................................ 4-2 Table 4-2: Leak Rate Correlation ............................................................ 4-2 Table 4-3: Probability of Leak Correlation ............................................................ 4-3 Table 5-1: Analysis Results for EOC-6 Voltage Distributions with NDE Uncertainty .............. 5-6 Table 5-2: Predicted Results ............................................................ 5-6 Table 6-1: BOC-7 Voltage Distributions ............................................................ 6-1 Table 6-2: Predicted EOC-7 Voltage Distributions ............................................................ 6-3 Table 6-3: EOC-7 Predicted Results ............................................................ 6-10 List of Tables June 2005 SG-SGDA-05-24 Revision I

v LIST OF FIGURES Figure 3-1: Watts Bar EOC-6 Voltage Distribution, SG 1........................................................ 3-6 Figure 3-2: Watts Bar EOC-6 Voltage Distribution, SG 2 ........................................................ 3-7 Figure 3-3: Watts Bar EOC-6 Voltage Distribution, SG 3........................................................ 3-8 Figure 3-4: Watts Bar EOC-6 Voltage Distribution, SG 4 ........................................................ 3-9 Figure 3-5: Watts Bar EOC-6 Repaired Indications, SG I ...................................................... 3-10 Figure 3-6: Watts Bar EOC-6 Repaired Indications, SG 2 ...................................................... 3-11 Figure 3-7: Watts Bar EOC-6 Repaired Indications, SG 3 ...................................................... 3-12 Figure 3-8: Watts Bar EOC-6 Repaired Indications, SG 4 ...................................................... 3-13 Figure 3-9: Watts Bar EOC-6 Indications Returned to Service, SG 1..................................... 3-14 Figure 3-10: Watts Bar EOC-6 Indications Returned to Service, SG 2 .................................... 3-15 Figure 3-11: Watts Bar EOC-6 Indications Returned to Service, SG 3.................................... 3-16 Figure 3-12: Watts Bar EOC-6 Indications Returned to Service, SG 4 .................................... 3-17 Figure 3-13: Watts Bar Voltage Growth per Cycle 6 ............................................................. 3-25 Figure 3-14: Watts Bar Voltage Growth Detail ............................................................. 3-26 Figure 3-15: Cycle 5 and Cycle 6 Bounding Growth Rates, per EFPY ................................... 3-27 Figure 3-16: Cycle 5 and Cycle 6 Bounding Growth Rates, per EFPY, Detail View ............... 3-28 Figure 3-17: Growth as a Function of BOC Voltage .............................................................. 3-29 Figure 4-1: Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Greater than 0.75 Volts with Worn Probe ............................................................. 4-6 Figure 4-2: Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Less than 0.75 Volts in Tubes Retested for Probe Wear ........................................... 4-7 Figure 5- 1: Voltage Distribution with NDE Uncertainty, SG 1................................................. 5-2 Figure 5-2: Voltage Distribution with NDE Uncertainty, SG 2................................................. 5-3 Figure 5-3: Voltage Distribution with NDE Uncertainty, SG 3................................................. 5-4 Figure 5-4: Voltage Distribution with NDE Uncertainty, SG 4 ................................................. 5-5 Figure 6- 1: Predicted Voltage Distribution, SG 1............................................................. 6-6 Figure 6-2: Predicted Voltage Distribution, SG 2 ............................................................. 6-7 Figure 6-3: Predicted Voltage Distribution, SG 3............................................................. 6-8 Figure 6-4: Predicted Voltage Distribution, SG 4 .............................................................. 6-9 List of Figures June 2005 SG-SGDA-05-24 Revision 1

vi GLOSSARY OF ACRONYMS BOC - Beginning of operation cycle. The current inspection is just prior to BOC-7.

EOC - End of operation cycle. The current inspection is at EOC-6. The end of the next cycle is EOC-7.

POD - Probability of detection. This value is set equal to 0.60 for the GL-95-05 predictive analysis for the condition of the steam generators at the end of the next cycle.

ODSCC - Outside diameter stress corrosion cracking.

SG - Steam Generator identifier. Specifically SG 1, SG 2, SG 3 and SG 4.

TSP - Tube support plate. The Generic letter 95-05 Alternate Repair Criterion applies to ODSCC in the tubes at the TSPs.

NODP - Normal Operating Differential Pressure FDB - Flow Distribution Baffle. This is the HOI tube support plate for Watts Bar Unit 1.

Glossary of Acronyms June 2005 SG-SGDA-05-24 Revision I

1-1

1.0 INTRODUCTION

Watts Bar Unit 1 completed the Cycle 6 of operation and subsequent steam generator tube inspection in February 2005. Axial ODSCC has been confirmed within the TSP regions of the steam generators and is a current degradation mechanism at Watts Bar Unit 1. The alternate repair criterion (ARC) defined in NRC Generic Letter 95-05 (Reference 1) is implemented at Watts Bar Unit 1. This report provides a condition monitoring assessment that demonstrates that the GL-95-05 acceptance criteria were satisfied at the end of operational Cycle 6 (EOC-6), and an operational assessment that demonstrates that the GL-95-05 acceptance criteria will continue to be satisfied throughout operational Cycle 7. A Watts Bar specific voltage growth rate was used in the EOC-7 prediction.

The operation cycle just completed, Cycle 6, was 482 Effective Full Power Days (EFPD). The next cycle, Cycle 7 is estimated to be 518 EFPD (Reference 2).

Introduction June 2005 SG-SGDA-05-24 Revision I

2-1 2.0

SUMMARY

AND CONCLUSIONS Bobbin voltage indications of ODSCC at the tube support plates were detected and measured in all four steam generators. Based on this voltage distribution, using the methodology of References 1 and 3, a Condition Monitoring evaluation including the computation of the probability of tube burst (POB) and the amount of leakage predicted for steam line break conditions at EOC-6 was performed. The acceptance criteria on POB and leakage are satisfied with significant margin.

The change in voltage from the previous inspection was determined by historical review for each indication detected. The apparent voltage growth rate during Cycle 6 was based on the historic review of 931 DSI indications identified during the Watts Bar Unit 1 EOC-6 inspection. An operational assessment prediction of the POB and leakage at steam line break conditions at EOC-7 was performed using a site specific bounding growth rate. The results indicate that the acceptance criteria on POB and leakage at EOC-7 will be satisfied with acceptable margin.

Therefore the Reference I acceptance criteria will be satisfied throughout Cycle 7.

Summary and Conclusions June 2005 SG-SGDA-05-24 Revision 1

3-1 3.0 EOC-6 INSPECTION RESULTS 3.1 VOLTAGE DISTRIBUTIONS AT EOC-6 Summaries of eddy current signal voltage distributions at the drilled support plates, for each steam generator, are shown in Table 3-1 through Table 3-4. Also shown are the number of indications in each voltage range detected at EOC-6 and the number of indications removed from service due to tube repairs for any reason. The number of indications that remain in service for Cycle 7 is the difference between the number of indications detected and the number of indications removed from service. No tubes were unplugged with the intent to return them to service after inspection.

Appendix A contains a listing of all DSI indications and their repair status. All DSI indications with an EOC-6 voltage greater to or equal to 1 volt were subject to Plus Point inspections.

Plugging repaired indications confirmed as being present by the Plus Point inspection.

The summary of all four-steam generators shows the following:

• A total of 940 TSP regions were identified as having ODSCC bobbin signal indications (DSIs) during the inspection.

• None of these indications were located within intersections that are excluded from the voltage-based repair criteria (as noted in Section l.b. I of Reference 1 as intersections with degradation that may collapse or deform as a result of combined loss-of-coolant and seismic events). These intersections were identified in Reference 4. None of these 940 indications were associated with a dent signal greater than 5 volts, copper deposits, or mixed residuals of sufficient magnitude to cause a 1.0 volt ODSCC indication to be missed or misread

• Of the 940 TSP regions, 149 had DSI indications above 1 volt.

• All indication with voltages greater than or equal to I volt, were subjected to an inspection with a Plus Point probe. Indications that confirmed during the Plus Point inspection were removed from service by plugging.

• Of the 149 TSP regions with indications above 1 volt, 104 were part of a tube that was repaired by plugging. 11 of these TSP regions were part of a tube that was plugged for reasons other than MRPC-confirmed ODSCC at that particular support plate. An additional 13 of these TSP regions were each part of a tube that was preventively plugged.

• A total of 82 of the 940 TSP regions were removed from service for reasons other than ODSCC at the support plates Figure 3-1 through Figure 3-12 illustrates the voltage distribution in each steam generator. Figure 3-1 through Figure 3-4 show the detected voltage distribution compared to the predicted distribution which was developed in the previous 90-day report, Reference 5. Figure 3-5 through Figure 3-8 show the distribution of repaired indications, and Figure 3-9 through Figure 3-12 show the distribution of indications that remain in service for the next operating cycle.

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-2 Table 3-1: Inspection Results for SG 1 EOC-6 In-Service MRPC MRPC Number Tested Not Returned Confinned Voltage of MRIRC But Not MRPC to or not Bin Indications Confirmed Confirmed Tested IPlugged Service Tested 0.2 13 13 1 12 12 0.3 13 1 3 9 13 10 0.4 32 1 7 24 2 30 23 0.5 42 1 8 33 5 37 30 0.6 54 3 14 37 4 50 36 0.7 46 3 11 32 7 39 32 0.8 20 2 3 15 1 19 16 0.9 31 2 4 25 4 27 23 1 9 1 1 7 1 8 7 1.1 19 12 7 12 7 1.2 20 12 8 20 1.3 7 5 2 _ 7 1.4 7 4 3 7 1.5 4 3 1 4 1.6 1 1 1 1.7 1 1 1 1.9 2 2 _ _ _ __2 _ _ _ _

2 2 1 1 2 2.15 1 1 1 2.39 1 1 1 2.62 2.81 1 1 1 3.1 1 1 1 X 3.31 1 1 1 3.66 1 1 _ 1 Total 330 62 73 195 88 242 189 Average voltage = 0.741 volts EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-3 Table 3-2: Inspection Results for SG 2 EOC-6 In-Service MRPC MRPC Number Tested Not Returned Confirmed Voltage of MRPC But Not MRPC to or not Bin Indications Confirmed Confirmed Tested Plugged Service Tested 0.2 3 3 3 3 0.3 14 1 2 11 1 13 11 0.4 25 4 5 16 1 24 19 0.5 34 6 4 24 3 31 28 0.6 22 5 5 12 1 21 16 0.7 19 3 10 6 1 18 8 0.8 21 5 8 8 2 19 11 0.9 11 2 3 6 1 10 7 1 16 4 6 6 1 15 9 i.1 6 6 __ _ _ 6 _ _ _ _

1.2 8 6 2 = 6 2 1.3 4 1 3 1 32 1.4 4 1 3 ____ 2 2 1.6 2 2 2 1.69 1 1 1 1.92 1 1 1 3.43 1 1 1 6.32 1 1 _ _ _ _ _ 1 Total 193 48 53 92 30 163 112 Average voltage = 0.701 volts EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision 1

3-4 Table 3-3: Inspection Results for SG 3 EOC-6 In-Service R'RPC MIRPC Tested Not Returned Confirmed Voltage Number of MRPC But Not MRPC to or not Bin Indications Confirmed Confirmed Tested Plugged Service Tested 0.2 5 3 2 5 2 0.3 is 1 17 18 17 0.4 19 1 3 15 19 16 0.5 27 1 5 21 3 24 19 0.6 32 1 12 19 2 30 18 0.7 19 1 1 17 2 17 16 0.8 28 2 11 15 3 25 15 0.9 13 3 10 1 12 9 1 10 1 2 7 2 8 6 1.1 12 3 9 4 8 1.2 4 4 4 1.3 3 3 1 2 1.4 1 1 1 1.6 1 _ _ _ _ 1 _ _ _ 1 1.7 3 _ _ _ _ 3 _ _ _ 3 1.77 1 _ _ _ _ 1 _ _ _ 1 1.87 1 __ _ _ _ _1 _ _ _ 1 2.16 1 1 1 _ _ _ _

2.36 1 1 _ _ _ 1 _ _ _ _ _ _ _ _ _ _

2.5 1 1 I _ _ _ _ _ 1 I__ _ _ _ _ _ _ _ _

2.99 1 1 __ _ _ 1 __ _ _ _ _ _ _ _

Total 201 14 64 123 23 178 118 Average voltage = 0.691 volts EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Rev'ision 1

3-5 Table 3-4: Inspection Results for SG 4 EOC-6 In-Scrvicc vIRPC MRPC Tested Not Returned Confirmed Vroltage Number of MRPC But Not MRPC to or not Bin Indications Confirmed Confirmed Tested Plugged Service Tested 0.2 5 5 1 4 4 0.3 22 1 3 18 5 17 14 0.4 30 7 23 2 28 22 0.5 38 8 30 4 34 26 0.6 38 9 29 5 33 24 0.7 28 3 3 22 4 24 22 0.8 16 1 1 14 2 14 13 0.9 11 1 10 1 10 10 1 7 1 2 4 7 5 1.1 6 2 4 4 2 1.2 2 2 1 1 1.3 5 2 3 = 2 3 1.4 2 __ __ _ 2 1 1 1.5 2 1 1 1 1 1.78 1 1 1 2.43 1 1 1 2.57 1 1 1 4.06 1 1 1 Total 216 14 47 155 36 180 140 Average voltage = 0.615 volts EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision 1

3-6 60 50 40+-

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a-E z 10 5-0n' ci e t O c - iO 'o c ci '-i 00 e N It %D cli ctii tti Volts Figure 3-5: Watts Bar EOC-6 Repaired Indications, SG I EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

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3-14 60 50 ElSAll Returnedl to Servicel 40 0

,0 E

20-10 o 0 0 - - - - c 3 Cq c en Vohs Figure 3-9: Watts Bar EOC-6 Indications Returned to Service, SG I EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Re-visio" I

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3-15 35 I 30 25 _ All Returned to Service 1 Confirurd or Not Tested 0

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I r-I 00 ON -_ M t \%0 c-e' Cs 3 C5 6 6 6 6 6 Volts Figure 3-10: Watts Bar EOC-6 Indications Retumed to Service, SG 2 EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-16 35 30[

25 20-Fu 31 Wa AU Returned to Service C-npConfirtrid orlNot Tested S 15-C 10 Volts Figure 3-1il: Watts Bar EOC-6 Indications Returned to Service, SG 3 EOC-6 Inspection. Results June 2005 SG-SGDA-05-24 Ro-viqnn

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) C) C) O _ 9 cN CS C-i co; <} <} Cl VoIts Figure 3-12: Watts Bar EOC-6 Indications Returned to Service, SG 4 EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Rcvision 1

3-18 3.2 VOLTAGE GROWTH RATES FOR CYCLE 6 Voltage growth was determined by the difference between the EOC-6 and EOC-5 voltages for each indication. The EOC-5 voltages were determined by historical reviews of the prior cycle data base and were established using the same techniques as used to analyze the EOC-6 data.

The voltage change is for the 482 EFPD cycle length of Cycle 6. The voltage at EOC-5 is provided for indications detected at EOC-6 in Appendix A.

The procedure for computing the voltage change and binning the values is described in Reference 3. Negative voltage changes are included in the 0 change bin. For cases where an EOC-6 indication did not have a corresponding EOC-5 indication, that EOC-6 indication was not included in the growth rate determination. Voltage change distributions for each steam generator are included in Table 3-5 through Table 3-8. Since there were less than 200 voltage growth rate data points for all of the steam generators except for SG 1, abounding EOC-6 specific growth rate distribution was used as defined in Table 3-9. A comparison of the steam generator specific growth rates and the EOC-6 bounding growth rate is shown in Figure 3-13 and the tail end is shown in detail in Figure 3-14.

Figure 3-15 presents a comparison of the bounding growth rates from Cycle 5 with that from Cycle 6. The data has been normalized to a 1 EFPY basis (365.25 EFPD). Figure 3-16 provides a detailed view of the tail of the curve. From these figures it is not clear which growth rate provides the more conservative results, thus separate analyses were performed using the Cycle 5 and Cycle 6 growth rates. The Operational Assessment results presented in Section 6.0 indicate that the Cycle 6 growth rate provides greater conservatism.

Figure 3-17 presents a plot of the volta~ge growth as a function of the BOC voltage. A regression line of the data is also included. The R value for the regression (0.0365) indicates that growth is not dependent on BOC voltage.

Indications were found in five FDB intersections. These FDB indications are summarized in Table 3-10. Two of the FDB indications were left in service. The average growth rate in these FDB regions were slightly less than that seen in steam generators 1 and 2.

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-19 Table 3-5: Voltage Changes from EOC-5 to EOC-6, SG 1 SG 1 Change Number of Cumulative in Volts Indications Distribution 0 116 0.35258 0.1 69 0.56231 0.2 43 0.69301 0.3 31 0.78723 0.4 26 0.86626 0.5 13 0.90578 0.6 11 0.93921 0.7 2 0.94529 0.8 5 0.96049 0.9 0.96049 1 2 0.96657 1.1 2 0.97264 1.2 0.97264 1.3 1 0.97568 1.4 1 0.97872 1.5 1 0.98176 1.7 1 0.9848 1.8 1 0.98784 1.9 0.98784 2 1 0.99088 2.5 2 0.99696 2.6 0.99696 2.9 1 1 3.3 1 5.7 _

Total 329 Average change = growth / EOC-5 volts = 26%

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-20 Table 3-6: Voltage Changes from EOC-5 to EOC-6, SG 2 SG2 Change Number of Cumulative in olts Indications Distribution o 58 0.30526 0.1 43 0.53158 0.2 31 0.69474 0.3 20 0.8 0.4 17 0.88947 0.5 7 0.92632 0.6 2 0.93684 0.7 6 0.96842 0.8 1 0.97368 0.9 1 0.97895 1 2 0.98947 1.1 0.98947 1.2 0.98947 1.3 0.98947 1.4 0.98947 1.5 X 0.98947 1.7 0.98947 1.8 0.98947 1.9 0.98947 2 0.98947 2.5 0.98947 2.6 0.98947 2.9 1 0.99474 3.3 0.99474 5.7 1 1 Total 190 Average change = growth / EOC-5 volts = 27%

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-21 Table 3-7: Voltage Changes from EOC-5 to EOC-6, SG 3 SG3 Change Number of Cumulative in Volts Indications Distribution o 82 0.41837 0.1 35 0.59694 0.2 29 0.7449 0.3 22 0.85714 0.4 11 0.91327 0.5 7 0.94898 0.6 3 0.96429 0.7 0.96429 0.8 3 0.97959 0.9 0.97959 1 _0.97959 1.1 0.97959 1.2 0.97959 1.3 0.97959 1.4 1 0.98469 1.5 0.98469 1.7 1 0.9898 1.8 0.9898 1.9 1 0.9949 2 0.9949 2.5 0.9949 2.6 1 1 2.9 1 3.3 1 5.7 1 Total 196 __

Average change = growth / EOC-5 volts = 14%

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision 1

3-22 Table 3-8: Voltage Changes from EOC-5 to EOC-6, SG 4 SG4 Change Number of Cumulative in Volts Indications Distrbution 0 95 0.43981 0.1 47 0.65741 0.2 27 0.78241 0.3 18 0.86574 0.4 10 0.91204 0.5 5 0.93519 0.6 6 0.96296 0.7 3 0.97685 0.8 1 0.98148 0.9 0.98148 1 1 0.98611 1.1 0.98611 1.2 1 0.99074 1.3 0.99074 1.4 0.99074 1.5 0.99074 1.7 0.99074 1.8 0.99074 1.9 1 0.99537 2 0.99537 2.5 X 0.99537 2.6 0.99537 2.9 0.99537 3.3 1 1 5.7 1 Total 216 Average change = growth I EOC-5 volts = 9%

EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision 1

3-23 Table 3-9: Voltage Changes from EOC-5 to EOC-6, Bound of All SGs Bounding Change Cumulative in Volts Distribution o 0.30526 0.1 0.53158 0.2 0.69301 0.3 0.78723 0.4 0.86626 0.5 0.90578 0.6 0.93684 0.7 0.94529 0.8 0.96049 0.9 0.96049 1 0.96657 1.1 0.97264 1.2 0.97264 1.3 0.97568 1.4 0.97872 1.5 0.98176 1.7 0.9848 1.8 0.98784 1.9 0.98784 2 0.98947 2.5 0.98947 2.6 0.98947 2.9 0.99474 3.3 0.99474 5.7 1 EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-24 Table 3-10: Indications at FDBs EOC6 EOCS Change in SG Row Column Sul)port Plugged Volts Volts Volts I 8 75 HOI. Yes 0.31 0.19 0.12 2 18 79 H01 Yes 0.46 0.29 0.17 2 27 85 HOI 0.38 0.19 0.19 2 38 77 HOI Yes 0.27 0.22 0.05 3 14 86 H01 I__ 0.55 0.69 -0.14 Average change = growth / EOC-5 volts = 25%

June 2005I Revision EOC-6 Inspection Results EOC-6 Inspection Results June 2005 SG-SGDA-05-24 SG-SGDA-05-2>4 Revision I

3-25

""I' v

. .i 0.9 ,11 I l lll 0.8 0.7 0.6 Q 0.5 a l SG2 U -+-SG2

_____ _____ - -SG 3 0.4

- tBound 0.3 0.2 0.1 0

0 I 2 3 4 5 6 Clange in Volts Figure 3-13: Watts Bar Voltage Growth per Cycle 6 EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-26 I

0.99 0.98 LI..

U 0.97 0.96 0.95 0 1 2 3 4 5 6 Change in Volts Figure 3-14: Watts Bar Voltage Growth Detail EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-27 l__

0.9 0.8 0.7 0.6 0.4 - l_ -- Cycle 5 Cycle 6 0.3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Growth (Volqs/EFPY)

Figure 3-15: Cycle 5 and Cycle 6 Bounding Growth Rates, per EFPY EOC-6 Inspection Rcsults June 2005 SG-SGDA-05-24 Revision I

3-28 1

0.99 0.98 Q

m U

_ _ __ _ _Cyc le 5 0.97 0.96 0.95 0 0.5 I 1.5 2 2.5 3 3.5 4 4.5 5 Growth (Vols/EFPY)

Figure 3-16: Cycle 5 and Cycle 6 Bounding Growth Rates, per EFPY, Detail View EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

3-29 6

5 4

4 0

3 E0 2

%M Ufor I

0

-1

-2 0 0.5 1 1.5 2 2.5 3 EOC-5 Volts Figure 3-17: Growth as a Function of BOC Voltage EOC-6 Inspection Results June 2005 SG-SGDA-05-24 Revision I

4-1 4.0 ANALYSIS METI['I IODS ANI) BASE FOR ARC CORRELATIONS B)ATA A Monte Carlo based computer program was used to perform the calculations prescribed in GL 95-05 (Reference 1). The methodology for predicting the EOC voltage distribution and computing the probability of burst and leakage at accident conditions is based on the Westinghouse Topical Report, WCAP-14277, Revision 1 (Reference 3) supplemented by recent changes in the leakage computation process, discussed in Reference 9 as amended in Reference

10. The EOC voltage distribution, probability of burst and the leakage are computed using the Cyclesim3.1 program, Reference 11.

The predictions for EOC-6 recorded in Reference 5 used the tube burst and leakage correlations of Addendum 5 to EPRI Report NP-7480-L modified according to References 9 and 10. Both the condition monitoring assessment for EOC-6 and the operational assessment predicting the EOC-7 voltage distribution are performed using the Addendum 6 database (Reference 6). Since Watts Bar Unit 1 can take credit for PORV actuation, the condition monitoring and operational assessments are performed using the leakage correlation for 2405 psi (Reference 2). The specific parameters used in the correlations are provided in Sections 4.1 through 4.4.

4.1 TUBE MATERIAL PROPERTIES The tube material properties are provided in Reference 3 (Table 4-1) for 3/4-inch diameter tubes at 650'F. The parameters used in the analysis are the flow stress mean of 71.565 ksi and the flow stress standard deviation of 3.567 ksi.

4.2 BURST CORRELATION The burst pressure, Pb, is normalized to a material with a flow stress of 71.565 ksi, which is the mean of the 3/4-inch tube data appropriate for Watts Bar Unit 1. The correlation parameters are taken from Reference 6.

Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision I

4-2 Table 4-1: Burst Correlation Pb = ao + a] Log(Volts)

Addendum 5 Addendum 6 Parameter Database Database Intercept, ao 7.4605 7.4403 Slope, a, -2.9572 -2.9679 Standard error 0.9009 0.9101 Mean of log(V) 0.3994 0.4018 SS log(V) 37.2648 37.3292 Number data points 98 100 Structural Limit ( 2405 psi) 5.67 V 5.65 V 4.3 LEAK RATE CORRELATION The leak rate correlation as a function of indication voltage is taken from Reference 6. The steam line break pressure is given as 2355 psi in Reference 2. Therefore the leak correlation for pressure of 2405 psi from Reference 6 is used for the leakage predictions.

The leak rate criterion is given in terms of gallons per minute condensed at room temperature.

Table 4-2: Leak Rate Correlation Log(Q) = b3 + b4 Log(Volts)

Addendum 5 Addendum 6 Parameter Database Database b3 -1.8708 -1.7849 4 2.9767 2.8990 Standard error 0.5979 0.5904 Mean log(V) 0.9210 0.9051 SS log(V) 3.1348 3.4733 Number data pairs 48 50 Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision I

4-3 4.4 PROBABILITY OF LEAK CORRELATION The probability of leak as a function of indication voltage is taken from Reference 6. In the Monte Carlo analysis leakage is quantified only if the indication is computed to be a leaker, based on the probability of leak correlation.

Table 4-3: Probability of Leak Correlation Pr(Leak) = 1/11+ exp[-b, - b2 Log(Volts)]}

Addendum 5 Addendum 6 Parameter Database Database Logistic intercept, b1 -4.8270 -4.4637 Logistic slope, b2 8.4488 8.0947 Intercept Variance, VI1 1.1623 0.9392 Covariance, V12 -1.7094 -1.4115 Slope of Variance, V22 2.8755 2.4739 Number of Data 125 127 4.5 NDE UNCERTAINTIES The NDE uncertainties applied for the EOC-6 and EOC-7 voltage projections are the same as used in the previous 90-day report, Reference 5, and described in Reference 3. The probe wear uncertainty has a standard deviation of 7% about a mean of zero and has a cutoff at 15% based on implementation of the probe wear standard. The analyst variability uncertainty has a standard deviation of 10.3% about a mean of zero with no cutoff. These NDE uncertainty distributions are used in the Monte Carlo analysis to predict the burst probabilities and accident leak rates at EOC-6, and EOC-7. The voltages reported were adjusted to account for differences between the laboratory standard and the standard used in the field.

4.6 UPPER VOLTAGE REPAIR LIMIT The upper voltage repair limit is based on the structural limit in Table 4-1 of 5.65 volts for accident pressure of 2405 psi. It must be reduced by considering the projected voltage growth during the next cycle and NDE uncertainty. The maximum average percentage growth rate for any steam generator is seen from Table 3-6 (SG 2) to be 27% per 482 day Cycle 6. According to Reference 1, the minimum growth adjustment is 30% per EFPY (42.5% per cycle for the anticipated 518 EFPD Cycle 7). Therefore the specific maximum value of 42.5% x (518/482) =

46% and 20% for NDE uncertainty will be used to estimate the voltage repair limit. This results in an upper voltage repair limit of 5.65 / (1 + 0.46 + 0.20) = 3.40 volts. No indications equal to or greater than this voltage were left in service.

Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision I

4-4 The limiting free span burst pressure is three times NODP. Reference 2 notes an RCS pressure of 2235 psig and steam pressure of 934 psig, making 3NODP=3903 psi. The upper voltage repair limit for FDB intersections is based on the structural limit from Figure 6-2 of Reference 6 of 3.29 volts for a free span burst pressure of 3903 psi. It must be reduced by considering the projected voltage growth during the next cycle and NDE uncertainty. The average percentage growth rate for the FDBs, from Table 3-10, is 25% during the 482 day Cycle 6. According to Reference 1, the minimum growth adjustment is 30% per EFPY (42.5% per cycle for the anticipated 518 EFPD Cycle 7). Therefore the specific maximum value of 42.5% x (518/482) = 46% and 20%

for NDE uncertainty will be used to estimate the voltage repair limit. This results in an upper voltage repair limit of 3.29 / (1 + 0.46 + 0.20) = 1.98 volts. No FDB indications equal to or greater than this voltage wvere left in service.

4.7 PROBE WEAR An alternate probe wear criteria approved by the NRC (Reference 8) was applied during the EOC-6 inspection. When a probe does not pass the 15% wear limit, this alternate criteria requires that only tubeswith indications above 75% of the repair limit inspected since the last successful probe wear check be reinspected with a good probe. As the repair limit for Watts Bar is 1 volt, all tubes containing indications for which the worn probe voltage is above 0.75 volts are to be inspected with a new probe. A total of 55 indications with a bobbin voltage above 0.75 volts were found in the calibration groups that failed probewear check (these indications were called as "RPW"), and the tubes containing those indications were reinspected with a new probe. Figure 4-1 shows the worn probe voltages plotted against the new probe voltages for all four SGs.

Seven indications had their voltage increase above the repair limit when reinspected with a good probe.

Figure 4-2 shows the voltage measured by the retest of indications that were less than 0.75 volts measured by the worn probe. This figure shows that none of the indications measured to be less than 0.75 volts by the worn probe measured over the repair criterion of 1.0 volts on the retest, i.e., no pluggable tubes were missed due to probe wear considerations. This observation supports the criterion that says that these indications did not need retesting.

The indications found in the current inspection that were tested with a worn probe in the previous (2003) inspection were identified. Of the 223 indications found in the current inspection that were tested with aworn probe in the previous inspection, 32 were I volt or greater. The ratio of indications greater than I volt to the total number of indications in the current inspection is 149 to 940 which is essentially the same ratio, indicating that there is no significant effect of probe wear on the population of indications.

As required by Reference 8, the number of new indications detected in the present inspection in tubes that were inspected with a worn probe in the last inspection was also determined. Out of a total of 377 new indications reported in the current inspection, 106 were in tubes inspected with a worn probe during the last inspection. During a recent review of the data from the last inspection, an analyst was able to assign a voltage to 104 of these 106 indications, which indicates that tubes inspected with worn probes during the last inspection do not contain a Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision 1

4-5 disproportionately larger number of new indications. Thus, the requirements specified in Reference 8 for applying the alternate probe wear criteria are met.

Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision 1

4-6 Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Greater than 0.75 Volts with Worn Probe 4

3.5 m 0 3 0

I-a.

2.5 0

2

• SG1 en 1.5 a SG2 SG3 0 1 SG4 0.5 1 Line 0

0 0.5 1 1.5 2 2.5 3 3.5 4 Volts, Original Test, Worn Probe Figure 4-1: Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Greater than 0.75 Volts with Worn Probe Analysis Methods and Data Baisc for ARC Correlations June 2005 SG-SGDA-05-24 SG-SDA-0-24R evision I

4-7 Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Less than 0.75 Volts inTubes Retested for Probe Wear 1

0.9 0.8 m 0.7

> 0.6

• SG1 m 05 a SG2 A SG4 1 Line a: 0.3 I- - - -

0.2 0.1 0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Watts Bar All SGs: Original DSI, volts Figure 4-2: Retest Voltage vs. First Test Voltage of Indications Originally Measured to be Less than 0.75 Volts in Tubes Retested for Probe Wear Analysis Methods and Data Base for ARC Correlations June 2005 SG-SGDA-05-24 Revision I

5-1 5.0 CONI)ITION MONITORING: TUIE I,EAK RATE AND BURST PROBABILITIES AT EOC-6 5.1 ANALYSIS APPROACH The measured EOC-6 voltage distributions of Table 3-1 through Table 3-4 for each steam generator are used as the basis for the leak rate and burst probability predictions for EOC-6. The voltage distributions developed for the computation of POB and leakage consider NDE uncertainty on the measured values, but consider no voltage growth. The resulting voltage distributions used for computation of the probability of burst and leakage are given in Figure 5-1 through Figure 5-4.

Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Revision 1

5-2 60 50 40 30 -

U 20 10

.0 0- e r- a~ - 1 -W aE - e m, 1- _- ) - cO\

6C 6n en N en e6 n "It Vots Figure 5-1: Voltage Distribution with NDE Uncertainty, SG I Condition Monitoring: Tube Leak Rate and Burst Probabilitics at EOC-6 June 2005 SG-SGDA-05-24 Rcvision

..a.... I.

.\-

5-3 35 30 25

. 20 ~+- U U U I-.

0 I-

- 15 z

10 5

• l 1IIII .

0 6i 6I I I

't C3 r~-

6 en %

-4 c7 I .

,4kI . Ie .

It Volts

> I e o O cl in~ k'rn t

00 t

. I

%D

_It

. I I .6 I fiO r-

%O Figure 5-2: Voltage Distribution with NDE Uncertainty, SG 2 Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Rcvision I

5-4 30 25 20 0

10 mot -f- ---

z 10 5

II 2 IIl 0 -4 en in - I\ -4 n r \e o do o c9i Cli c C-i clS cli d Vots Figure 5-3: Voltage Distribution with NDE Uncertainty, SG 3 Condition Monitoring. Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Revision I

5-5 40 35 30

=

1o 25 C::

- 20

.0 Z 15 10 I1lllllEll l 5

0 r- -4 en kn C%1-- en n r C' - en kn r- C% en rf n 66 t6 6 6d - -o - e cli c'i dCei -i fat a"i Add (I V6 - -A Vohs Figure 5-4: Voltage Distribution with NDE Uncertainty, SG 4 Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Revision I

5-6 5.2 EOC-6 BURST PROBABILITIES AND LEAK RATES The Monte Carlo analysis results for each of the steam generators based on the measured voltage distribution at EOC-6 are shown in Table 5-1. The analysis program inputs and outputs are detailed in Reference 7. One-million Monte Carlo trials were performed for each steam generator. The leakage rate is the 95th percentile evaluated at 95% confidence. The burst probability is 95% confidence based on the number of trials.

Table 5-2 presents the predicted results from Reference 5. Since the Reference S analysis used Addendum 5 parameters, Table 5-1 includes the results using the Addendum 5 parameters as well.

Table 5-1: Analysis Results for EOC-6 Voltage Distributions with NDE Uncertainty 95195 Using SLB Number of' Maximum Parameters Burst Leak Monte Carlo Number of' Volts from Probability Rate, SG I Trials Indieations Measured Addendum 95% conf. gem 5 5.21 x 104 0.0521 1 1,000,000 330 3.66 6 7.48 x 10 0.0593

_ 2.54 x 10-3 0.175 2 1,000,000 193 6.32 6 3.03 x 10_3 0.180 6 3.03 x103 0.180

_ 1.92 x 10i- 0.0168 3 1,000,000 201 2.99 642.62 x IO' __00 6 2.62 x 10 0.0203 5 3.86 x 10 0.0371 4 1,000,000 216 4.06 4 6 4.78 x 10 0.0410 Table 5-2: Predicted Results 95195 Using SLB Number of Maximum Parameters Burst Leak Monte Carlo Number of Volts from Probability Rate, SG I Trials Indications Predicted Addendum 95% conf gpM 1 250,000 380.7 5.3 5 2.34 x 10- 0.175 2 250,000 200 5.4 5 1.98 x 10-3 0.143 3 250,000 218.7 5.2 5 1.63x 10-3 0.124 4 250,000 212 5.0 5 1.10 x 10- 0.099 Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Revision I

5-7 5.3 COMPARISON WITH ACCEPTANCE CRITERIA AND PREDICTION All steam generators are well below the burst acceptance criterion of 1.0 x 10-2, and the Watts Bar Unit I leakage criterion of 3 gpm per steam generator (Reference 12). The acceptance criteria on POB and leakage are satisfied with significant margin.

The predicted values of the probability of burst and leakage were conservative because they were based on a very conservative industry voltage growth rate in Reference 5. The use of Addendum 6 parameters instead of Addendum 5 parameters had a minor influence on the results. The number of indications was closely predicted. The identification of a 6.32 volt indication at the H03 support of tube R5CIO1 in SG 2 contributed significantly to the under prediction of leak rate and burst probability in SG 2.

Condition Monitoring: Tube Leak Rate and Burst Probabilities at EOC-6 June 2005 SG-SGDA-05-24 Revision 1

6-1

6.0 O'ERATIONAlASSESSMIENT

TUIBE LEAK RATE AND BURST PlROBABILITIES AT EOC-7 6.1 ANALYSIS APPROACH The BOC-7 voltage distributions are developed, within the Cyclesim3.1 program, from the measured EOC-6 distribution by considering the POD and the indications that are removed from service. The EOC-7 voltage distribution is developed considering the NDE uncertainties and voltage growth during the cycle. The latest burst and leakage correlations, Reference 6, are used for the EOC-7 predictions. The burst probabilities and leak rates are computed using the computed EOC-7 voltage predictions to address the acceptance criteria at the end of the cycle.

6.2 POD The POD used is the NRC accepted value of 0.6 for all voltages (Reference 1). The beginning of Cycle 7 (BOC-7) voltage distributions are shown in Table 6-1.

Table 6-1: BOC-7 Voltage Distributions 11OC-7 Voltage Distributions Volts SG 1 SG 2 SG 3 SG 4 0.1 0 0 0 0 0.2 20.67 5 8.33 7.33 0.3 21.67 22.33 30 31.67 0.4 51.33 40.67 31.67 48 0.5 65 53.67 42 59.33 0.6 86 35.67 51.33 58.33 0.7 69.67 30.67 29.67 42.67 0.8 32.33 33 43.67 24.67 0.9 47.67 17.33 20.67 17.33 1 14 25.67 14.67 11.67 1.1 19.67 4 16 6 1.2 13.33 7.33 6.67 2.33 1.3 4.67 5.67 4 6.33 1.4 4.67 4.67 0.67 2.33 1.5 2.67 0 0 2.33 1.6 0.67 3.33 1.67 0 1.7 0.67 0.67 5 0 1.8 0 0 1.67 1.67 1.9 1.33 0.67 1.67 0 2 1.33 0 0 0 2.1 0 0 0 0 2.2 0.67 0 0.67 0 Operational Assessment TUBE Leak} Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision 1

6-2 Table 6-1: BOC-7 Voltage Distributions BOC-7 Voltage Distributions Volts SG 1 SG 2 SG 3 SG4 2.3 0 0 0 0 2.4 0.67 0 0.67 0.67 2.5 0 0 0.67 0 2.6 0.67 0 0 0.67 2.7 0 0 0 0 2.8 0.67 0 0 0 2.9 0 0 0 0 3 0 0 0.67 0 3.1 0.67 0 0 0 3.2 0 0 0 0 3.3 0.67 0 0 0 3.4 0 0.67 0 0 3.5 0 0 0 0 3.6 0 0 0 0 3.7 0.67 0 0 0 3.8 0 0 0 0 3.9 0 0 0 0 4 0 0 0 0 4.1 0 0 0 0.67 4.2 0 0 0 0 4.3 0 0 0 0 4.4 0 0 0 0 4.5 0 0 0 0 4.6 0 0 0 0 4.7 0 0 0 0 4.8 0 0 0 0 4.9 0 0 0 0 5 0 0 0 0 5.1 0 0 0 0 5.2 0 0 0 0 5.3 0 0 0 0 5.4 0 0 0 0 5.5 0 0 0 0 5.6 0 0 0 0 5.7 0 0 0 0 5.8 0 0 0 0 Operational Assessment TUBE Leak- Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

6-3 Table 6-1: BOC-7 Voltage Distributions BOC-7 Voltae Distributions Volts SG 1 SG 2 SG 3 SG 4 5.9 0 0 0 0 6 0 0 0 0 6.1 0 0 0 0 6.2 0 0 0 0 6.3 0 0.67 0 0 6.4 9 0 0 0 0 Total 462.0 291.7 312.1 324.0 6.3 VOLTAGE GROWTH RATES FOR CYCLE 7 Both the Cycle 5 and Cycle 6 bounding voltage growth rates, shown in Figure 3-15 and Figure 3-16, were considered for the Cycle 7 analysis.

6.4 PREDICTION OF VOLTAGE DISTRIBUTIONS AT EOC-7 The prediction of the EOC-7 voltage distributions is based on the BOC-7 indications and the composite growth rate. The length of Cycle 7 is established at 518 effective full power days (EFPD), Reference 2. The EOC-7 predicted voltage distributions (using both the Cycle 5 and Cycle 6 growth rates) are shown in Table 6-2 and in Figure 6-1 through Figure 6-4. The voltage distributions predicted using both growth rates are similar, with the predictions using the Cycle 6 growth rates populated with somewhat greater frequency in the lower voltages and with higher tail-end voltages. The analysis inputs and outputs are detailed in Reference 7.

Table 6-2: Predicted EOC-7 Voltage Distributions Cycle 5 Growth Rate Cycle 6 Growth Rate Volts SG I SG 2 SG 3 SG 4 SG I SG 2 SG3 SG4 0.1 0.23 0.06 0.09 0.08 0.3 0.07 0.12 0.11 0.2 4.59 1.5 2.33 2.17 6.03 1.97 3.06 2.85 0.3 9.19 6.2 7.84 8.5 11.26 7.94 9.96 10.88 0.4 17.91 13.61 13.56 17.08 21.91 16.8 16.33 20.91 0.5 29.57 21.19 20.19 26.25 35.3 25.2 23.87 31.16 0.6 40.71 26.19 26.24 33.51 46.74 29.78 30.03 38.36 0.7 47.04 28.75 30.24 36.83 52.06 31.31 32.84 39.92 0.8 48.86 29.44 31.36 35.99 51.36 30.49 32.88 36.78 0.9 46.5 28.53 30.51 32.62 46.84 28.04 30.64 31.37 1 41.87 25.62 27.7 27.63 39.95 24.52 26.89 25.36 1.1 35.46 21.62 23.55 21.91 32.82 20.52 22.31 19.64 Operational Assessment: TUBE Leak Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

6-4 Table 6-2: Predicted EOC-7 Voltage Distnbutions Cyce 5 Growth Rate ycye 6 Growth Rate Volts SGI SG2 SG3 SG4 SG1 SG2 SG3 SG4 1.2 28.41 17.48 19.18 16.53 26.05 16.52 17.81 14.89 1.3 22.1 13.77 14.97 12.22 20.31 12.78 13.64 11.16 1.4 16.75 10.88 11.5 9.27 15.23 9.78 10.2 8.36 1.5 12.95 8.73 8.86 7.37 11.16 7.48 7.54 6.22 1.6 10.27 7.13 7.1 6.19 8.19 5.7 5.65 4.64 1.7 8.39 5.75 5.88 5.28 6.02 4.22 4.43 3.47 1.8 6.83 4.56 4.89 4.34 4.42 3.09 3.52 2.57 1.9 5.38 3.53 4.08 3.35 3.28 2.34 2.9 1.94 2 4.11 2.67 3.33 2.44 2.58 1.8 2.41 1.55 2.1 3.04 1.97 2.64 1.69 2.13 1.41 1.99 1.28 2.2 2.22 1.42 2.05 1.14 1.84 1.13 1.69 1.11 2.3 1.63 0.99 1.55 0.79 1.62 0.94 1.46 1 2.4 1.26 0.68 1.16 0.59 1.46 0.8 1.25 0.9 2.5 1.07 0.53 0.95 0.55 1.29 0.67 1.06 0.8 2.6 1.08 0.56 0.92 0.69 1.13 0.53 0.89 0.67 2.7 1.16 0.71 0.96 0.91 0.94 0.41 0.73 0.53 2.8 1.36 0.79 0.98 1.03 0.77 0.31 0.58 0.4 2.9 1.45 0.74 0.97 1.01 0.62 0.24 0.46 0.3 3 1.36 0.61 0.9 0.85 0.51 0.18 0.36 0.22 3.1 1.13 0.51 0.76 0.63 0.43 0.14 0.27 0.16 3.2 0.89 0.43 0.61 0.43 0.36 0.11 0.21 0.12 3.3 0.71 0.34 0.47 0.29 0.4 0.12 0.2 0.12 3.4 0.57 0.26 0.34 0.2 0.4 0.19 0.26 0.21 3.5 0.45 0.2 0.25 0.15 0.48 0.27 0.27 0.29 3.6 0.36 0.15 0.17 0.11 0.55 0.32 0.29 0.34 3.7 0.29 0.12 0.12 0.09 0.59 0.27 0.3 0.34 3.8 0.23 0.1 0.09 0.08 0.52 0.23 0.25 0.28 3.9 0.19 0.08 0.07 0.07 0.4 0.2 0.22 0.2 4 0.16 0.06 0.06 0.06 0.32 0.17 0.17 0.15 4.1 0.13 0.05 0.05 0.06 0.24 0.13 0.12 0.12 4.2 0.11 0.04 0.04 0.06 0.18 0.09 0.09 0.1 4.3 0.23 0.07 0.09 0.11 0.14 0.07 0.06 0.08 4.4 0.26 0.19 0.23 0.28 0.1 0.05 0.04 0.07 4.5 0.42 0.32 0.27 0.4 0.08 0.04 0.02 0.06 4.6 0.55 0.38 0.33 0.48 0.06 0.03 0.02 0.05 4.7 0.63 0.32 0.35 0.46 0.04 0.02 0.01 0.04 Operational Assessment: TUBE Leak Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision 1

6-5 Table 6-2: Predicted EOC-7 Voltage Distributions Cycye 5 Growth Rate C cye 6 Growth Rate Volts SG 1 SG2 SG3 SG4 SG 1 SG2 SG 3 SG 4 4.8 0.53 0.26 0.27 0.22 0.03 0.01 0.01 0.04 4.9 0.39 0.23 0 0 0.02 0.01 0.01 0.03 5 0.04 0.18 0.7 0.7 0.02 0.01 0.01 0.02 5.1 0 0.12 0 0 0.01 0 0.01 0.02 5.2 0.7 0 0 0 0.01 0 0 0.02 5.3 0 0 0.3 0.3 0.01 0 0 0.01 5.4 0.3 0 0 0 0.01 0 0 0.01 5.5 0 0 0 0 0.01 0 0 0.01 5.6 0 0 0 0 0 0 0 0.01 5.7 0 0 0 0 0 0 0 0.01 5.8 0 0 0 0 0 0 0 0 5.9 0 0.7 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 6.1 0 0 0 0 0 0 0 0 6.2 0 0 0 0 0.01 0 0 0 6.3 0 0 0 0 0.11 0.04 0.05 0.05 6.4 0 0 0 0 0.14 0.23 0.15 0.17 6.5 0 0 0 0 0.27 0.32 0.18 0.25 6.6 0 0 0 0 0.36 0.27 0.22 0.24 6.7 0 0 0 0 0.4 0.28 0.04 0 6.8 0 0 0 0 0.17 0.06 0 0.7 6.9 0 0 0 0 0 0 0.7 0 7 0 0.3 0 0 0.7 0.7 0 0 7.1 0 0 0 0 0 0 0 0.3 7.2 0 0 0 0 0.3 0 0.3 0 7.3 0 0 0 0 0 0 0 0 7.4 0 0 0 0 0 0.3 0 0 7.5 0 0 0 0 0 0 0 0 Total 462.0 291.7 312.1 324.0 462.0 291.7 312.1 324.0 Operational Assessment: TUBE Leak Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision 1

6-6 60 50 SeUsing Cycle 5 GrowthIl U Using Cycle 6 Growtli 40 0

~E U

10 20 10 .iZ~

'a{

20

't '.0 (7 N i M %0 CI% ('4 00 - -t N- rN M 6 6 t6 4

-4 -~4 d e'i "ier f 4 .4 i Ili VoIS Figure 6-1: Predicted Voltage Distribution, SG 1 Operational Assessment TUBE Leak Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

6-7 35 30

+kU-ing Cycle 5 Growtl n Using Cycle 6 Growth 25

3) 20 fr-.

0 I..

. 15 z

10 l_111111 5 II-IX 0

- 6t I %O O~ Cq 'in 0c - "t t- '1 r I'D C oN cs 00 - -o i- r-0 6 C5 .- dl C~ C- tr ~ f 1i *1 4 i Vi wv o '6 t Voks Figure 6-2: Predicted Voltage Distribution, SG 2 Operational Assessment TUBE Leak Rate and Burst Pirobabilities at EOC-7 SJ Runc 2005 SG-SGDA-05-24 Revision I

6-8 35 30 m Using Cycle 5 Growth a Using Cycle 6 Growth 25

.2

._ 20 c:

13 0

-1 v-~

- 15 z

10 5

. S1 0

'tCs1 -4 en '0 en k ON Cq t 00 r-

'.6 r-6- %0 Voks Figure 6-3: Predicted Voltage Distribution, SG 3 Operational Assessment TUBE Leak Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

6-9 45 40 35 s S > SUsing Cycle 5 Growtih

> i: > U Using Cycle 6 Growtsh 30 06 _ I,,

- 25 0

" 20 z

15 t.D1 I0 11 1111111111 -

JWU  :- I I~- 11 111II 5

0 66Cs r- en '3 0 C1e4 V) 00 -' t r= -t en %O 0C e9 oo -i -1* r- r- M 6 -. _ d e!fi. kn vli %0 %'6 '.6 z Volts Figure 6-4: Predicted Voltage Distribution, SG 4 EOC-7 June 2005 TUBE Leak AssessmenL TUBE Operational Assessment Leak Rate and Burst Rite and Probabilities at Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

6-10 6.5 PREDICTION OF TUBE LEAK RATES AND BURST PROBABILITIES AT EOC-7 The Monte Carlo analysis results for predicted EOC-6 voltage distributions are shown in Table 6-3. One-million Monte Carlo trials were performed for each steam generator in this operational assessment. Both Cycle 5 and Cycle 6 growth rates were considered The leakage rate is the 95l' percentile evaluated at 95% confidence. The burst probability is 95% confidence based on the number of trials. The analysis program inputs and outputs are detailed in Reference 7.

The predictions using the Cycle 6 growth rate distribution results in the larger values for both the burst probability and the bounding leak rate.

Table 6-3: EOC-7 Predicted Results 95'/95 Number of' Predictions Burst SLB Monte Made Using Probability Leak Carlo Number of Growtlh Rate Maximum 95% Rate SG 'Trials Indications Cycle Volts* Confidence (gpm) 5 5.4 4.10X 10 3 0.255 1 1,000,000 462.0 732 6 7.2 8.65 x 10- 0.461 5 7.0 4.72 X 10-3 0.268 2 1,000,000 291.7 _______ _____

6 7.4 7.52 X 10' 0.409 5 5.3 2.61 X 103 0.176 3 1,000,000 312.1 _ _ _ _ _ _ _ _ _ _ _ _ _

6 7.2 5.74 X 10i3 0.334 5 5.3 2.60X 10` 0.178 4 1,000,000 324.0 _ _ _ _ _ 3_______

4 6 7.1 5.68 X 10 0.334

• Voltage where tail is accumulated to 0.3 indications 6.6 COMPARISON WITH ACCEPTANCE CRITERIA All steam generators are below the burst acceptance criterion of 1.0 x 10.2, and the Watts Bar Unit I leakage criterion of 3 gpm (Reference 12).

Operational Assessment TUBE Leak-Rate and Burst Probabilities at EOC-7 June 2005 SG-SGDA-05-24 Revision I

7-1

7.0 REFERENCES

1. NRC Generic Letter 95-05, "Voltage-Based Repair Criteria for Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Corrosion Cracking," USNRC Office of Nuclear Reactor Regulation, August 3, 1995.

2. TVA Letter, C.R. Allen to M.H. Cothron, "Watts Bar Nuclear Plant (WBN)-U1C6 Steam Generator Tube Integrity Inspection," L29 050405800, March 15, 2005.

3. WCAP-14277, Revision 1, "SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections," Westinghouse Nuclear Services Division, December 1996.

4. Letter from John W. Irons, Westinghouse, to J.E. Maddox and Michael J. Lorek, Tennessee Valley Authority, "Tennessee Valley Authority Watts Bar Nuclear Power Plant Unit 1 -

Application for Implementation of Voltage Based Repair Criteria - Westinghouse Steam Generator Tubes Affected by ODSCC at TSPs," WAT-D-10709, January 12, 2000.

5. Westinghouse Report SG-SGDA-03-44, Rev.0, "Condition Monitoring and Operational Assessment: GL 95-05 Alternate Repair Criterion End of Cycle 5, 90 Day Report, Watts Bar Unit I," December 2003.

6. EPRI Report NP-7480-L, Addendum 6, 2004 Database Update, "Steam Generator Outside Diameter Stress Corrosion Cracking at Tube Support Plates Database for Alternate Repair Limits," October 2004.

7. Westinghouse Calculation CN-CDME-05-11, Rev. 0, "Watts Bar EOC 6 GL 95-05 Analyses," June 2005.

8. Letter from B. W. Sheron, Nuclear Regulatory Commission, to A. Marion, Nuclear Energy Research Institute, February 9, 1996.

9. Letter from A. Marion, Nuclear Energy Research Institute, to B. Sheron, Nuclear Regulatory Commission, Refining the Leak Rate Sampling Methodology for ODSCC ARC Applications (Generic Letter 95-05)," March 15, 2002.

10. Letter from W. Bateman, Nuclear Regulatory Commission, to A. Marion, Nuclear Energy Research Institute, "Refining the Leak Rate Sampling Methodology for Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Application," March 27, 2002.

11. Westinghouse Letter LTR-SGDA-03-204, "Instructions for Running the Computer Code Cyclesim3. I," R. Keating, Westinghouse Nuclear Services Division, August 30, 2003.

12. Letter from Douglas V. Pickett, Nuclear Regulatory Commission, to Karl W. Singer, Tennessee Valley Authority, 'Watts Bar Nuclear Power Plant, Unit 1 - Issuance of References June 2005 SG-SGDA-05-24 Revision 1

7-2 Amendment Regarding Main Steamline Break Accident Leakage Rate (TAC MC0665),"

March 10, 2005.

References June 2005 SG-SGDA-05-24 Revision 1

A-l Appendix A In(licatioln List Watts Bar Unit I GL-95-05 EInd of Cycle 6 Sorted by EOC-6 Voltage Steam Generator 1 Row Col Plugged") Ind Elev EOC6 Volts EOC5 VoltsZ) 25 35 Y DSI H02 3.66 0.78 8 43 Y DSI H03 3.31 0.81 12 72 Y DSI H02 3.1 0.62 8 62 y DSI H03 2.81 1.05 4 58 Y DSI H03 2.62 1.85 12 71 Y DSI H03 2.39 0.47 8 69 Y DSI H03 2.15 0.86 4 27 Z DSI H03 1.95 0.45 9 63 Y DSI H03 1.95 0.34 40 86 Y DSI H03 1.89 0.53 8 58

• DSI H03 1.81 0.84 5 11 Y DSI H02 1.65 0.63 8 41 Y DSI H03 1.6 0.94 6 66 y DSI H03 1.5 0.7 20 63 y DSI H05 1.48 0.52 8 64 Y DSI H03 1.45 0.74 10 40 Y DSI H03 1.45 0.43 5 17 Y DSI H02 1.4 0.96 5 12 y DSI H02 1.38 0.66 3 102 Y DSI H03 1.36 0.91 37 98 Y DSI 1H02 1.36 0.96 4 47 Y DSI H02 1.34 0.88 7 7 DSI H03 1.34 0.59 5 48 Y DSI 1H06 1.32 0.99 7 63 Y DSI H03 1.28 0.85 7 19 y DSI H02 1.26 0.69 4 78 Y DSI H02 1.24 0.95 6 94 Y DSI 1H04 1.24 1.29 9 52 Y DSI H02 1.23 0.83 17 36 Y DSI H02 1.23 1.42 17 22 Y DSI H02 1.21 0.67 5 10 Y DSI H02 1.19 1.21 5 86 y DSI H04 1.19 0.91 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-2 Steam Generator 1 Row Col Plugged(' Ind Elev EOC6 Volts EOC5SVolts(Z' 5 90 Y DSI H02 1.19 1.06 7 8 y DSI H03 1.19 0.53 17 6 y DSI H03 1.19 1.05 4 23 y DSI H04 1.18 1.27 6 46 y DSI H03 1.18 0.58 5 78 y DSI H02 1.17 0.99 9 46 Y DSI H03 1.17 0.62 4 63 y DSI H03 1.16 0.83 5 48 y DSI H03 1.16 0.92 8 19 y DSI H03 1.16 0.99 14 39 y DSI H04 1.16 0.72 6 11 y DSI H03 1.15 0.6 6 60 y DSI H03 1.14 0.72 13 7 Y DSI H04 1.14 1.57 21 20 y DSI H04 1.14 0.96 5 19 y DSI H02 1.13 0.68 13 72 Y DSI H02 1.13 0.82 10 65 Y DSI H03 1.12 0.54 5 92 y DSI H04 1.1 0.55 3 61 DSI H03 1.09 0.71 4 1 DSI H02 1.09 0.97 8 8 y DSI H03 1.09 0.76 22 30 Y DSI H03 1.09 0.74 6 8 y DSI H02 1.08 0.82 7 11 DSI H02 1.07 0.98 32 63 DSI H02 1.06 1.36 43 39 DSI H08 1.06 1.14 5 77 y DSI H02 1.05 0.99 6 41 y DSI H03 1.05 0.62 7 12 DSI H02 1.05 0.94 6 50 y DSI H03 1.04 1.41 7 50 Y DSI H03 1.03 0.44 12 46 Y DSI H02 1.03 0.7 5 55 y DSI H03 1.02 0.45 7 106 DSI H05 1.01 0.7 10 65 y DSI H04 1.01 0.96 22 109 y DSI H02 1.01 0.53 8461 y DSI 103 1 0.95 6 110 DSI H05 0.97 0.61 9 5 DSI H03 0.97 0.8 6 82 DSI H02 0.95 0.96 5 53 DSI H03 0.93 0.61 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-3 Steam Generator 1 Row Col Ilugge&l Ind Elev EOC6 Volts EOC5 Volts"'

7 16 DSI H04 0.93 0.68 3 24 DSI H03 0.91 0.33 3 67 DSI H02 0.91 0.74 5 73 DSI H03 0.91 0.54 11 38 DSI H04 0.9 0.6 2 46 DSI H03 0.89 0.89 3 63 DSI H03 0.89 0.7 5 9 DSI H03 0.89 1.04 6 11 Y DSI H02 0.89 0.88 7 15 DSI H02 0.89 0.96 3 57 DSI C14 0.88 1.07 5 23 _ DSI H02 0.88 0.63 15 103 DSI H02 0.88 0.39 5 52 DSI H03 0.87 0.89 5 94 DSI H04 0.87 0.72 7 9 DSI H02 0.87 0.95 8 47 DSI H03 0.87 0.43 5 94 DSI H02 0.86 0.77 8 53 DSI H03 0.86 0.6 31 21 DSI H03 0.86 0.41 34 24 DSI H02 0.86 0.67 7 55 DSI H03 0.85 0.49 8 108 DSI H05 0.85 0.75 3 69 DSI H02 0.84 0.53 3 102 y DSI H02 0.84 0.59 6 94 y DSI H02 0.84 0.97 8 51 DSI H04 0.84 0.54 9 53 DSI H03 0.84 0.72 5 24 DSI H03 0.82 0.53 9 54 DSI H05 0.82 0.94 9 57 DSI H03 0.82 0.42 12 2 Y DSI H02 0.82 1.48 41 64 DSI H04 0.82 0.72 5 24 DSI H02 0.81 0.82 6 82 DSI H04 0.81 1.04 2 2 DSI H02 0.8 0.74 5 47 DSI H04 0.8 0.72 6 93 DSI H02 0.8 1.32 11 33 Y DSI H02 0.78 0.98 5 9 . DSI H02 0.77 0.84 13 91 DSI H02 0.77 0.7 4 89 DSI H03 0.76 0.37 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-4 Steam Generator 1 Row Col Plugged) hInd Elev EOC6 Volts EOC5 Volts2 5 42 DSI H03 0.76 0.52 5 53 DSI H04 0.76 0.56 8 89 DSI H04 0.75 0.57 3 72 DSI H03 0.72 0.33 7 108 DSI H04 0.72 0.6 LI18 65 DSI H04 0.72 0.75 18 74 DSI H06 0.72 0.38 19 81 DSI H03 0.72 0.68 22 94 DSI H03 0.72 0.44 3 57 DSI H04 0.71 0.47 3 69 DSI H03 0.71 0.63 6 37 DSI H03 0.71 0.64 7 104 DSI H04 0.71 0.59 5 18 DSI H02 0.7 0.55 5 46 DSI H03 0.7 0.66 6 l0l DSI H04 0.7 0.59 7 107 DSI H05 0.7 0.24 3 59 DSI H04 0.69 0.37 7 19 Y DSI H04 0.69 0.53 7 108 DSI H05 0.69 0.6 3 23 DSI H02 0.68 0.59 5 7 DSI H02 0.68 0.55 5 14 DSI H03 0.68 0.58 6 3 DSI H03 0.68 0.72 8 43 Y DSI H04 0.68 0.32 8 109 DSI H02 0.68 0.36 9 43 DSI H03 0.68 0.42 3 45 DSI H03 0.67 0.75 3 67 DSI H03 0.67 0.69 5 55 Y DSI H02 0.67 0.76 6 56 DSI H03 0.67 0.35 10 30 DSI H04 0.67 0.47 11 71 DSI H03 0.67 0.71 12 50 DSI H05 0.67 0.68 5 11 Y DSI H03 0.66 0.87 5 27 DSI H03 0.66 0.49 6 84 DSI H02 0.66 0.41 10 65 y DSI H05 0.66 0.43 1 25 DSI H03 0.65 0.68 8 112 DSI H05 0.65 0.57 5 71 DSI H03 0.64 0.4 6 94 y DSI H03 0.64 0.76 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-5 Steam Generator 1 Row Col Plugged(" Ind Elev EOC6 Volts EOC5 Voltst 1 6 DSI H03 0.63 0.73 3 7 DSI H03 0.63 0.89 6 75 DSI H02 0.63 0.59 7 61 DSI H03 0.63 0.47 9 47 DSI H04 0.63 0.6 3 10 DSI H06 0.62 0.67 6 63 DSI H03 0.62 0.53 19 100 DSI H02 0.62 0.52 36 100 DSI H03 0.62 0.37 3 59 DSI H02 0.61 0.64 3 61 DSI H06 0.61 0.55 6 9 DSI H02 0.61 0.24 7 11 DSI H03 0.61 0.52 12 71 L DSI H02 0.61 0.46 21 79 DSI H02 0.61 0.66 25 24 DSI H02 0.61 0.38 42 69 DSI H03 0.61 0.1 3 94 DSI H04 0.6 0.27 8 25 DSI H05 0.6 0.47 15 37 DSI H04 0.6 0.68 1 59 DSI H03 0.59 0.69 4 90 DSI H02 0.59 0.63 6 41 y DSI 1H02 0.59 0.43 6 99 DSI 1H05 0.59 0.49 7 65 DSI H03 0.59 0.57 9 47 DSI H02 0.59 0.36 12 66 DSI H02 0.59 0.49 12 68 DSI H02 0.59 0.33 3 51 DSI H04 0.58 0.64 8 64 y DSI H04 0.58 0.51 10 66 DSI H03 0.58 0.3 10 107 DSI H04 0.58 0.49 38 85 DSI H02 0.58 0.78 7 68 DSI H03 0.57 0.48 10 18 DSI H02 0.57 0.67 11 33 Y DSI H03 0.57 0.58 11 44 DSI H02 0.57 0.63 4 26 DSI H02 0.56 0.31 4 109 DSI H08 0.56 0.68 5 47 DSI H03 0.56 0.36 5 92 DSI H02 0.56 0.69 7 59 DSI H02 0.56 0.44 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-6 Steam Generator 1 Row Col Plugged(') Ind Elev EOC6 Volts EOC5 Voltsrr) 10 46 DSI H03 0.56 0.63 29 20 DSI H02 0.56 0.69 3 97 DSI H03 0.55 0.46 7 15 DSI H03 0.55 0.32 7 61 DSI H07 0.55 0.48 7 61 DSI H08 0.55 0.32 8 34 DSI H02 0.55 0.53 13 67 DSI H03 0.55 0.44 5 6 DSI H03 0.54 0.71 7 15 DSI H04 0.54 0.5 7 103 DSI H03 0.54 0.71 3 19 DSI H03 0.53 0.8 5 37 DSI H02 0.53 0.36 7 76 DSI H04 0.53 0.49 10 17 DSI H05 0.53 0.61 22 12 DSI H02 0.53 0.38 37 90 DSI H03 0.53 0.45 42 39 DSI H02 0.53 0.91 1 108 DSI CIO 0.52 0.43 2 16 DSI H07 0.52 0.35 2 90 DSI H03 0.52 0.37 5 58 DSI H03 0.52 0.59 8 104 DSI 1H05 0.52 0.46 4 50 DSI H03 0.51 0.33 6 77 DSI H07 0.51 0.47 7 18 DSI H03 0.51 0.69 8 42 DSI H03 0.51 0.57 8 91 DSI H02 0.51 0.65 9 20 DSI H05 0.51 0.44 5 92 y DSI H03 0.5 0.37 6 67 DSI H03 0.5 0.7 7 4 DSI H03 0.5 0.65 7 59 DSI H04 0.5 0.59 8 81 DSI H02 0.5 0.26 9 13 DSI H04 0.5 0.69 2 87 DSI H03 0.49 0.5 3 54 DSI H07 0.49 0.4 5 77 DSI H06 0.49 0.22 3 36 DSI H05 0.48 0.32 5 44 DSI 1H03 0.48 0.62 4 51 DSI 1H04 0.47 0.56 6 65 DSI H03 0.47 0.44 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-7 Steam Generator 1 Row Co Plugged(" Inmd Elev EOC6 Volts EOC5 Volts 2) 10 44 DSI H07 0.47 0.22 16 39 DSI H03 0.47 0.38 1 58 DSI H02 0.46 0.56 3 8 DSI H03 0.46 0.61 4 22 DSI H04 0.46 0.6 7 8 y DSI H02 0.46 0.48 9 48 DSI H05 0.46 0.6 17 72 DSI H05 0.46 0.61 4 8 DSI CIO 0.45 0.45 5 48 y DSI H07 0.45 0.41 10 69 DSI H03 0.45 0.42 15 93 DSI H02 0.45 0.25 32 70 DSI H03 0.45 0.12 35 48 DSI H02 0.45 0.35 2 111_ DSI H04 0.44 0.74 3 90 1 DSI H02 0.44 0.47 5 1 DSI H02 0.44 0.44 6 40 DSI H03 0.44 0.44 7 108 DSI H03 0.44 0.34 5 27 DSI H08 0.43 0.66 5 76 DSI H02 0.43 0.27 9 9 DSI H02 0.43 0.36 11 101 DSI H03 0.43 0.21 3 65 DSI H03 0.42 0.47 5 72 DSI H03 0.42 0.41 10 12 DSI H04 0.42 0.57 46 86 DSI H03 0.42 0.38 7 19 Y DSI H05 0.41 0.4 16 39 DSI H02 0.41 0.18 3 51 DSI H02 0.4 0.52 5 15 DSI H05 0.4 0.42 5 29 DSI H04 0.4 0.45 8 89 DSI H05 0.4 0.41 42 41 DSI H03 0.4 INR 1_3 7 _1 DSI H03 0.39 0.35 17 54 DSI H04 0.39 0.44 5 61 DSI H03 0.38 0.53 8 52 DSI H03 0.38 0.63 9 9 DSI H05 0.38 0.48 41 94 DSI H03 0.38 0.25 6 63 DSI H06 0.37 0.73 16 65 DSI H02 0.37 0.36 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-8 Steam Generator 1 Row Col Plugged") Ind Elev EOC6 Volts EOC5 Volts(2 20 93 DSI H03 0.36 0.29 21 16 DSI H03 0.36 0.41 39 74 DSI H02 0.36 0.67 15 37 DSI H05 0.35 0.59 1-8 55 DSI CIO 0.35 0.29 6 43 DSI H03 0.34 0.29 7 49 DSI H03 0.34 0.31 34 99 DS1 H02 0.34 0.4 11 69 DSI H03 0.33 0.29 13 68 DSI H03 0.33 0.26 1 31 DSI H08 0.32 0.44 2 111 DSI CIO 0.32 0.37 4 28 DSI H02 0.32 0.35 5 44 DSI H02 0.32 0.36 6 104 DSI H08 0.32 0.4 12 93 DSI H02 0.32 0.35 5 12 y DSI H06 0.31 0.17 8 75 y DSI H01 0.31 0.19 9 45 DSI H03 0.31 0.27 5 51 DSI H03 0.3 0.11 17 64 DSI H03 0.3 0.32 2 4 DSI H03 0.29 0.58 23 99 DSI H03 0.29 0.25 4 69 DSI H02 0.28 0.35 46 41 DSI H02 0.28 1.16 6 15 DSI H02 0.27 0.69 18 56 DSI H03 0.26 0.21 1 39 DSI H03 0.25 0.22 6 69 DSI H03 0.25 0.24 25 69 DSI CIO 0.25 0.26 3 45 DSI H04 0.23 0.19 22 73 DSI H04 0.22 0.47 4 29 DSI H07 0.2 0.23 8 58 y DSI H04 0.19 0.19 17 64 DSI H04 0.19 0.14 17 94 DSI H04 0.19 0.22 19 36 DSI H02 0.19 0.31 22 82 DSI H03 0.19 0.18 39 84 DSI H05 0.19 0.28 6 103 DSI H03 0.18 0.17 31 18 DSI H02 0.17 0.32 38 92 DSI H02 0.15 0.19 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-9 Steam Generator 1 Row ICol Pluggedl) I Ind IElev IEOC6 Volts IEOC5 Volts(2) 7 21 DSI H08 0.14 0.4 62 DSI HOS 0.14 0.35 18 68 DSI 02 0.13 0.21 (1) All indications greater than or equal to 1 volt at EOC-6 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.

(2) Indications without an EOC5 Volts value were not used in the determination of growth rate.

INF = Indication Not Found INR = Indication Not Reportable Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-10 Steam Generator2 Row Col Plugged(" Ind Elev EOC6 Volts EOC5 Volts(2) 5 101 DSI H03 6.32 0.66 11 44 z DSI H02 3.43 0.59 12 52 y DSI H02 1.92 0.97 10 112 DSI H05 1.69 0.78 46 88 DSI H02 1.54 1.62 4 114 DSI H02 1.52 1.24 15 56 DSI H03 1.35 1.1 14 68 DSI H04 1.34 1.45 8 65 y DSI H04 1.33 0.88 48 41 y DSI H03 1.33 0.65 10 84 DSI H03 1.28 1.15 5 41 y DSI H03 1.27 0.45 1 382 DSI H03 1.25 1.05 9 64 DSI H02 1.22 0.52 13 44 y DSI H02 1.2 0.72 6 113 DSI H02 1.18 1.1 5 8 y DSI H03 1.15 1.2 8 56 y DSI H04 1.15 0.53 10 111 y DSI H03 1.14 0.67 2 49 Y DSI H03 1.11 0.88 15 76 DSI H03 1.11 0.82 18 110 y DSI H03 1.11 0.74 6 51 DSI H03 1.09 0.74 1 59 Y DSI 1H03 1.07 0.86 10 36 y DSI H03 1.07 0.76 6 103 y DSI H03 1.04 0.42 7 45 Y DSI H03 1.03 0.61 41 49 Y DSI H03 1.02 0.56 5 105 y DSI H03 1 0.99 7 63 __ DSI H05 0.98 0.4 8 63 1 DSI H04 0.98 1.02 13 104 _ DSI H03 0.97 0.62 9 38 DSI H02 0.95 0.6 11 56 DSI H02 0.95 0.85 5 24 DSI H04 0.94 0.82 16 75 _ _ DSI H02 0.94 0.96 43 81 _ _ DSI H03 0.94 0.56 1 42 DSI H08 0.93 1.09 13 49 DSI H02 0.93 0.73 18 41 DSI 103 0.93 0.6 5 84 1DSI H03 0.91 0.69 June 2005I Revision Appendix A Appendix A June 2005 SG-SGDA-OS-24 SG-SGDA-05-24 Revision I

A-li Steam Generator 2 Row Col Plugged() Ind Elev EOC6 Volts EOC5 Volts" 5 85 DSI H03 0.91 0.51 7 4 DSI H02 0.91 0.56 13 78 DSI H04 0.91 0.6 11 98 DSI H02 0.89 0.14 2 87 y DSI H02 0.88 0.81 7 67 DSI H03 0.88 0.65 3 60 DSI H03 0.87 0.8 9 41 DSI H03 0.86 0.67 2 46 DSI H03 0.84 0.32 8 64 DSI H04 0.84 0.59 10 46 1 DSI H021 0.84 0.52 12 37 _ _ DSI H04 0.84 1.16 3 49 DSI H03 0.83 0.72 45 81 DSI H02 0.81 0.18 5 39 DSI H03 0.8 0.77 6 45 DSI H03 0.8 0.45 12 43 Y DSI H03 0.8 0.17 3 68 1 DSI H04 0.79 0.95 6 38 DSI H03 0.79 0.98 48 44 DSI H03 0.77 0.41 2 83 DSI H02 0.76 0.78 3 23 DSI H02 0.76 0.76 5 52 DSI H03 0.76 0.73 10 53 y DSI H02 0.75 0.48 11 82 _ _ DSI H03 0.74 0.64 5 37 _ _DSI H03 0.73 0.57 6 35 _ _DSI H04 0.73 0.84 9 99 DSI H03 0.73 0.71 12 31 DSI H04 0.73 0.66 13 67 DSI H03 0.73 0.85 3 101 DSI H03 0.72 0.52 8 42 DSI H03 0.72 0.38 4 1041 DSI H03 0.71 0.66 10 78 DSI H03 0.71 0.24 18 38 DSI H05 0.71 0.55 11 39 DSI H04 0.7 1.03 2 68 DSI H02 0.68 0.35 4 1131 DSI H02 0.68 0.58 7 111 DSI H03 0.68 0.3 9 64 DSI H05 0.68 0.44 12 32 Y DSI H02 0.68 0.5 7 13 1DSI H04 0.67 0.52 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-12 Steam Generator 2 Row Col Plugge(ld) In( Elev EOC6 Volts EOC5 Volts(2) 15 66l DSI 1103 0.67 0.39 3 63 lDSI H03 0.66 0.65 6 114 DSI H02 0.65 0.22 8 106 DSI HO04 0.65 0.51 11 52 _ _ DSI H02 0.65 INR 3 113 DSI H02 0.64 0.55 9 96 DSI H03 0.64 0.37 8 69 _ DSI H03 0.62 0.68 12 78 DSI 1H02 0.62 0.35 23 1011 DSI H02 0.62 0.32 4 20 DSI H03 0.61 0.58 5 36 DSI H03 0.61 0.71 3 66 DSI H04 0.6 0.5 10 42 DSI H103 0.6 0.33 12 70 DSI H104 0.6 0.47 16 37 DSI H06 0.6 0.48 9 68 1 DSI H105 0.59 0.63 2 1081 DSI H03 0.58 0.44 9 84 DSI H03 0.58 0.87 10 49 DSI H02 0.58 0.58 14 14 DSI H05 0.58 0.56 10 45 DSI H03 0.56 0.45 5 1 1 DSI H102 0.55 0.41 5 61 DSI H104 0.55 0.76 10 36 DSI H102 0.55 0.73 12 66 DSI H03 0.55 0.51 9 74 DSI H06 0.54 0.24 13 72 1 DSI H02 0.54 0.22 47 83 DSI H02 0.54 0.32 7 12 DSI 1H04 0.53 0.41 11 65 DSI H02 0.53 0.31 2 73 DSI H02 0.52 0.66 1 75 DSI H03 0.51 0.32 45 82 _ DSI H02 0.51 0.72 1 54 DSI H03 0.49 0.37 2 53 DSI H03 0.49 0.35 8 39 DSI H02 0.49 0.35 16 40 DSI H03 0.49 0.22 49 34 DSI H02 0.49 0.48 1 45 DSI H03 0.48 0.32 3 51 DSI 1H03 0.48 0.41 6 104 1DSI 1H03 0.48 0.33 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-13 Steam Generator 2 Row Col Plugged"i) Ind Elev EOC6 Volts EOC5 Volts 8 38 DSI H04 0.48 0.64 9 5 DSI H02 0.48 0.75 32 84 DSI H03 0.48 0.46 5 60 DSI CIO 0.46 0.46 9 41 DSI H04 0.46 0.75 14 77 DSI H07 0.46 0.24 18 79 y DSI H01 0.46 0.29 24 36 DSI H02 0.46 0.36 32 88 DSI H03 0.46 0.38 2 96 DSI H02 1 0.45 0.71 4 55 DSI H03 0.45 0.37 1 43 DSI H03 0.44 0.38 10 43 DSI H02 0.44 0.88 2 113 DSI H03 0.43 0.38 11 36 1 DSI H02 0.43 0.89 20 84 DSI H01 0.43 INR 23 54 DSI H08 0.43 0.24 2 45 DSI H03 0.42 0.3 3 15 DSI H02 0.42 0.62 6 11 DSI H02 0.42 0.35 7 12 j DSI H03 0.42 0.87 9 44 DSI H03 0.42 0.25 12 37 DSI H03 0.42 0.46 4 50 DSI H03 0.41 0.42 5 24 DSI H03 0.41 0.71 28 91 DSI 1H01 0.41 INF 6 45 DSI H02 0.4 0.37 11 72 DSI H04 0.39 0.31 8 78 DSI CIO 0.38 0.32 15 76 DSI H04 0.38 0.48 18 1091 DSI H03 0.38 0.4 27 85 DSI 1101 0.38 0.19 1 78 DSI CIO 0.37 0.33 22 105 DSI H03 0.37 0.33 13 52 DSI H02 0.36 0.33 15 28 DSI H02 0.36 0.29 38 69 DSI C04 0.36 0.32 2 104 DSI H03 0.35 0.35 5 9 DSI H03 0.35 0.54 28 51 DSI C04 0.35 0.4 9 7 DSI H05 0.34 1.13 18 55 __ _ DSI H05 0.34 0.33 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-14 Steam Generator 2 RoNw Col Plugged(" Ind Elev EOC6 Volts EOC5 Volts'2 10 77 y DSI H05 0.33 0.29 37 49 DSI H03 0.33 0.3 5 62 DSI H07 0.32 0.58 9 88 DSI H02 0.32 0.16 10 79 DSI H05 0.31 0.43 11 100 DSI H03 0.31 0.32 16 50 DSI H02 0.31 0.33 18 43 DSI H02 0.31 0.32 19 30 DSI H03 0.31 0.59 7 69 DSI H02 0.28 0.35 18 34 DSI H02 0.27 0.27 38 77 DSI H01 0.27 0.22 43 91 DSI H06 0.26 0.18 48 76 DSI H03 0.26 0.27 1 47 DSI H03 0.25 0.16 4 36 DSI H07 0.25 0.44 10 12 DSI H02 0.25 0.56 13 69 DSI H05 0.25 0.54 5 70 DSI H03 0.23 0.12 9 78 DSI H03 0.23 0.15 20 38 DSI H05 0.23 0.34 22 89 DSI H03 0.23 0.33 43 90 DSI H02 0.21 0.13 2 66 DSI H06 0.2 0.22 12 111 DSI H03 0.16 0.33 28 104 DSI H02 0.16 0.77 (1) All indications greater than or equal to 1 volt at EOC-6 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.

(2) Indications without an EOC5 Volts value were not used in the determination of growth rate.

INF = Indication Not Found INR = Indication Not Reportable Appendix A June 2005 SG-SGDA-05-24 Revision I

A-15 Steam Generator 3 Row Col l Plued) lInd ElIev IEOC6 Volts EOC5 Volts(2' 14 1 0 0 y DSI 1H021 2.99 0.46 7 42 y DSI H03 2.51 0.83 9 48 y DSI H03 2.36 0.53 14 48 y DSI H02 2.16 1.83 29 87 DSI H02 1.87 1.79 6 59 DSI H04 1.77 0.4 48 67 DSI H03 1.69 1.26 4 32 DSI H02 1.67 1.4 11 85 DSI H02 1.66 1.78 7 88 DSI H02 1.57 1.37 10 44 y DSI H03 1.37 1.34 10 52 y DSI H04 1.26 1.19 11 90 DSI H04 1.26 1.13 10 113 DSI H02 1.21 1.39 6 77 DSI H02 1.2 0.49 10 66 DSI H02 1.14 0.85 4 87 DSI H02 1.12 0.85 21 19 DSI H02 1.11 1.61 22 90 DSI H03 1.06 0.56 26 99 DSI H04 1.06 0.32 6 53 DSI H03 1.04 0.46 16 49 DSI H04 1.04 1.33 17 88 DSI H03 1.04 1 32 56 j DSI H03 1.04 0.56 6 58 Y DSI H02 1.03 1.03 10 52 y DSI H05 1.03 1.11 11 96 y DSI H03 1.02 0.66 12 88 DSI H03 1.02 0.61 34 57 DSI H04 1.02 INF 7 109 DSI H04 1.01 1.12 6 66 y DSI H03 1 0.41 14 62 DSI H04 1 0.86 11 97 DSI H02 0.98 1.35 25 98 DSI H03 0.97 0.75 6 66 DSI H041 0.96 0.9 25 14 DSI H02 0.96 0.23 7 90 DSI H05 0.95 1.28 6 48 DSI H05 0.94 0.9 18 87 DSI H02 0.94 0.37 7W1 97 _ DSI H03 0.93 0.96 21 98 DSI H02 0.89 0.75 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-16 Steam Generator 3 Row Col Plugged") Ind Elev EOC6 V'olts EOC5 Volts( 2 )

6 63 y DSI H03 0.88 0.54 10 83 DSI H03 0.88 1.14 6 45 DSI H02 0.87 0.74 10 36 DSI H04 0.87 1 28 94 DSI H02 0.86 0.49 7 18 DSI H03 0.84 1.04 47 63 DSI H02 0.84 0.73 8 64 DSI H05 0.82 0.75 11 111i DSI H05 0.82 0.39 5 78 DSI H04 0.81 0.93 6 38 DSI H02 0.81 0.75 6 77 DSI H03 0.81 0.34 7 101 DSI H05 0.8 1.02 16 67 DSI H04 0.8 0.75 35 51 DSI H05 0.8 0.56 8 64 DSI 1H04 0.78 0.82 10 40 DSI H03 0.78 0.68 6 68 DSI H07 0.77 0.66 16 69 DSI H05 0.77 0.79 22 23 DSI H03 0.77 0.53 44 70 DSI 1H06 0.77 0.56 3 66 DSI H06 0.76 0.65 4 23 DSI H02 0.76 0.85 6 26 DSI H04 0.76 0.81 6 48 DSI H02 0.76 0.73 7 102 DSI H04 0.76 0.6 12 51 DSI H04 0.76 1 12 85 DSI H05 0.76 0.51 2 68 DSI H03 0.75 0.76 16 67 DSI H05 0.75 0.58 19 90 DSI H05 0.75 0.62 2 112 DSI H04 0.74 0.44 6 62 DSI H05 0.74 0.61 13 72 DSI H02 0.74 0.36 14 48 y DSI H06 0.74 0.38 25 27 DSI H02 0.74 0.9 6 79 DSI H05 0.72 1.17 6 61 y DSI H05 0.71 0.58 7 68 DSI H03 0.71 0.26 8 76 DSI H04 0.71 0.62 3 83 DSI H02 0.7 0.55 4 35 DSI H02 0.69 0.71 June 20051 Revision Appendix A June 2005 SG-SGDA-05-24 SG-S GDA -0 5-24 Revision I

A-17 Steam Generator 3 Row Col lPlugedt') Ind Elev EOC6 Volts EOC5 Volts 32 26 y DSI H02 0.69 0.39 6 41 DSI H03 0.68 0.39 7 104 DSI H05 0.68 0.59 8 3 DSI H02 0.68 0.64 4 113 Y DSI H02 0.67 0.75 5 47 DSI H03 0.67 0.4 35 57 _ DSI H03 0.67 0.61 3 69 DSI H02 0.65 0.44 5 20 DSI H02 0.65 0.42 5 95 DSI H04 0.65 0.84 6 68 DSI H03 0.65 0.61 6 42 DSI H03 0.64 0.75 10 61 DSI H02 0.64 0.42 1 76 DSI H06 0.62 0.63 7 93 DSI H04 0.62 0.98 37 96 DSI H02 0.62 0.38 14 21 DSI H03 0.61 0.45 3 66 DSI H03 0.6 0.54 4 86 DSI H02 0.6 0.65 4 112 DSI H03 0.59 INR 6 43 DSI H02 0.59 0.61 7 1021 DSI H05 0.59 0.41 9 46 DSI H04 0.59 0.47 19 90 DSI H03 0.59 0.57 9 62 DSI H04 0.58 1.08 15 72 DSI H03 0.58 0.34 11 90 DSI H05 0.57 0.31 14 62 DSI H02 0.57 0.56 16 97 DSI H03 0.57 0.35 28 95 DSI H03 0.57 0.2 5 36 DSI H06 0.56 0.57 5 95 DSI H02 0.56 0.55 6 81 DSI H04 0.56 0.49 10 15 DSI H05 0.55 0.63 13 75 DSI H02 0.55 0.18 14 86 DSI H01 0.55 0.69 20 45 _ DSI H02 0.55 0.81 3 60 DSI H03 0.54 0.44 6 79 DSI H02 0.54 0.53 7 68 DSI H06 0.54 0.21 11 68 DSI H03 0.54 0.5 5 18 DSI H03 0.53 0.72 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-18 Steam Generator 3 RoNw Col lPlugged) Ind Elev EOC6 Volts EOC5 Volts 35 30 lDSI H02 0.53 0.3 11 62 DSI H02 0.52 0.57 20 86 DSI H06 0.52 0.17 5 25 DSI H04 0.51 0.64 6 62 y DSI H03 0.51 0.51 6 63 y DSI H05 0.51 0.42 14 111 DSI H02 0.51 0.29 3 65 DSI H03 0.5 0.69 7 76 DSI H05 0.5 0.34 22 65 DSI H02 0.5 0.29 10 101 DSI H02 0.49 0.17 22 76 DSI H02 0.49 0.31 22 92 DSI H03 0.49 1.45 6 84 y DSI H04 0.48 0.58 5 56 DSI H02 0.47 0.69 6 10 DSI H05 0.47 0.42 10 61 DSI H04 0.47 0.35 10 82 DSI H04 0.46 0.5 6 63 y DSI H02 0.45 0.51 9 53 DSI H04 0.45 0.54 12 83 DSI H06 0.45 0.3 6 61 y DSI H04 0.44 0.33 7 63 DSI H03 0.44 0.51 12 37 DSI H02 0.44 0.33 17 92 DSI H05 0.44 0.32 4 23 DSI H03 0.43 0.46 6 70 DSI H03 0.42 0.35 6 78 DSI H02 0.42 0.75 6 97 DSI C14 0.42 0.6 7 1061 DSI H04 0.42 0.44 9 22 1 DSI H02 0.42 0.59 3 61 DSI H02 0.41 0.48 5 37 DSI H02 0.41 INR 28 94 DSI H03 0.41 0.32 3 65 DSI H02 0.4 0.45 7 30 DSI H05 0.39 0.42 31 99 DSI H02 0.39 0.19 38 55 DSI H02 0.39 0.21 3 74 DSI H03 0.38 0.25 10 112 DSI H05 0.38 0.22 12 36 DSI H05 0.38 0.66 17 86 DSI H02 0.38 0.38 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-19 Steam Generator 3 Row Col Plugged(' Ind Elev EOC6 Volts EOC5 Volts( 2 '

6 80 DSI H04 0.36 0.35 7 49 _ DSI H03 0.35 INF 33 95 DSI H02 0.35 INF 7 4 _ _ DSI H02 0.34 0.36 28 95 DSI H04 0.34 0.33 17 45 DSI H03 0.33 0.28 29 103 DSI H06 0.33 0.67 2 24 DSI H07 0.32 0.35 7 44 DSI H02 0.32 0.34 17 95 DSI H02 0.32 1.28 8 10 DSI H05 0.31 0.32 4 26 DSI H02 0.29 0.38 10 76 DSI H03 0.29 0.25 15 75 DSI H03 0.29 0.29 46 33 DSI H03 0.29 0.3 3 78 DSI H03 0.28 0.31 4 47 DSI H02 0.28 0.29 4 86 DSI H03 0.28 0.37 17 94 DSI H05 0.27 0.42 22 84 DSI H08 0.27 0.4 40 91 DSI H05 0.27 0.38 10 88 DSI H05 0.26 0.56 5 106 DSI H08 0.24 0.26 18 91 DSI H04 0.24 0.23 5 89 DSI H04 0.23 0.33 6 31 DSI H08 0.23 0.26 10 75 DSI H02 0.23 0.12 4 21 DSI H07 0.22 0.35 6 30 DSI H03 0.21 0.69 4 89 DSI C13 0.2 0.19 22 105 DSI H02 0.19 0.11 28 95 DSI H06 0.18 0.17 1888 DSI H06 0.15 0.47 28 95 DSI H02 0.11 0.21 (1) All indications greater than or equal to 1 volt at EOC-6 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.

(2) Indications without an EOC5 Volts value were not used in the determination of growth rate.

INF = Indication Not Found INR = Indication Not Reportable Appendix A June 2005 SG-SGDA-05-24 Revision I

A-20 Steam Generator 4 Row CoI Plugged") Ind Elev EOC6 Volts EOC5 Volts12 '

6 110 Y DSI H03 4.06 0.85 8 104 y DSI H02 2.57 0.67 8 91 Y DSI H02 2.43 1.52 8 39 _ _DSI H03 1.78 2.61 6 1091 DSI H05 1.49 1.36 7 97 DSI H02 1.42 0.95 29 41 _ DSI H02 1.36 1.15 12 53 y DSI H02 1.33 0.56 8 36 DSI H03 1.28 1.04 46 27 DSI H02 1.26 1.33 6 8 y DSI H02 1.24 0.13 25 108 y DSI H04 1.24 0.74 8 39 DSI H02 1.23 0.99 6 113 DSI H02 1.2 1.51 7 97 y DSI H03 1.2 0.78 6 27 DSI H03 1.1 1.37 8 34 Y DSI H02 1.1 1.97 8 103 Y DSI H02 1.1 0.51 4 33 y DSI H03 1.08 1.41 48 42 DSI C05 1.08 1.12 10 95 _ DSI H02 1.06 0.44 10 37 DSI H04 1 0.65 5 102 DSI H04 0.95 0.33 5 108 DSI H02 0.93 0.34 8 98 DSI H03 0.92 1.4 9 49 DSI H02 0.92 0.65 5 31 DSI H03 0.91 0.36 30 105 DSI H03 0.91 0.5 8 27 DSI H02 0.9 0.67 5 75 DSI H04 0.89 0.76 6 45 DSI H04 0.89 0.95 2 43 DSI H03 0.86 0.31 3 25 1 DSI H03 0.85 0.92 14 31 DSI H05 0.85 0.65 7 112 DSI H03 0.84 0.23 3 102 DSI H03 0.83 0.8 12 52 DSI H02 0.83 0.73 6 84 DSI H07 0.81 0.71 12 87 DSI H03 0.81 0.49 7 96 DSI H02 0.79 0.71 1 87 DSI H03 0.78 0.76 Appendix A June 2005 SG-SGDA-05-24 Revision I

A-21 Steam Generator 4 l Row Col Plugged"' Ind Elev EOC6 Volts EOC5 Volts 5 98 DSI H02 0.78 0.53 12 14 Y DSI H02 0.78 0.37 6 109 _ DSI H04 0.76 0.7 1 1131 DSI H02 0.74 0.48 5 2 DSI H05 0.74 0.62 8 27 DSI H03 0.74 1.18 1 26 DSI H03 0.73 0.8 3 89 y DSI H02 0.73 0.58 7 6 DSI H02 0.73 0.76 5 41 DSI H03 0.72 0.66 7 45 DSI H04 0.72 0.66 10 37 DSI H03 0.72 0.99 12 89 DSI H05 0.71 0.12 48 51 DSI H03 0.71 0.36 3 53 Y DSI H05 0.69 0.62 8 111 DSI H04 0.69 0.54 11 41 DSI H03 0.69 0.55 2 39 DSI H04 0.68 0.89 4 85 DSI H02 0.67 0.48 5 106 DSI H02 0.67 0.14 7 108 DSI H03 0.67 0.33 8 39 DSI H04 0.67 1.13 4 87 DSI H03 0.66 1.57 8 104 Y DSI H03 0.66 0.3 12 12 DSI H03 0.66 0.48 5 113 DSI H04 0.65 0.66 6 50 DSI H04 0.65 0.54 7 102 DSI H02 0.65 0.38 24 66 1 DSI Cll 0.65 0.41 3 41 DSI H03 0.64 0.69 8 1001 DSI H02 0.64 0.26 9 49 DSI H04 0.64 0.4 4 87 DSI H02 0.63 0.37 5 62 DSI H02 0.63 0.59 3 9 DSI H05 0.62 0.82 8 103 y DSI H04 0.62 0.45 14 48 Y DSI 1H02 0.62 0.26 6 40 DSI H03 0.61 0.52 7 62 DSI H05 0.61 0.65 8 27 DSI H04 0.61 0.99 9 41 DSI H04 0.61 0.43 48 61 1DSI H03 0.61 1.52 Appcndix A June 2005 SG-SGDA-05-24 Revision 1

A-22 Steam Generator 4 _

Row Col Plugged) Ind( Elev EOC6 Volts EOC5 Volts( 2Z 6 6 DSI H02 0.6 0.25 6 100 DSI H03 0.6 0.55 7 65 DSI H05 0.6 0.59 8 34 y DSI H03 0.6 0.87 14 44 DSI H02 0.6 0.44 14 33 DSI H04 0.59 0.59 43 28 DSI H02 0.59 0.64 46 77 DSI H02 0.59 0.2 1 32 DSI H03 0.57 0.5 4 39 y DSI 1H03 0.57 0.71 5 68 DSI 1H02 0.57 0.51 5 103 DSI H04 0.57 0.46 7 5 DSI H04 0.57 0.37 2 61 DSI H03 0.56 0.44 2 98 DSI H03 0.56 0.63 4 46 y DSI H05 0.56 0.6 5 38 DSI H03 0.56 0.59 2 39 DSI H03 0.55 0.34 2 53 DSI H02 0.55 0.41 3 29 DSI H03 0.55 0.5 4 59 DSI H05 0.55 0.44 4 72 DSI H02 0.55 0.28 4 99 DSI H03 0.55 0.48 5 67 DSI H05 0.55 0.55 4 64 DSI H05 0.54 0.51 5 62 DSI H05 0.54 0.5 5 73 DSI H04 0.54 0.33 2 66 DSI C12 0.53 0.54 4 100 DSI H02 0.53 0.52 6 28 DSI H03 0.53 0.36 14 49 y DSI H02 0.53 0.58 3 101 Y DSI H04 0.52 0.14 24 60 DSI C10 0.52 0.61 4 26 DSI H03 0.51 0.3 4 60 DSI H04 0.51 0.56 5 68 DSI H05 0.51 0.49 8 49 DSI H03 0.51 0.5 11 41 DSI H05 0.51 0.54 3 74 DSI H02 0.5 0.25 39 97 = DSI H07 0.5 0.52 5 66 DSI H04 0.49 0.48 6 101 DSI H03 0.49 0.49 June 20051 Revision Appendix A A June 2005 SG-SGDA-O5-24 SG-SGDA-05-24 Revision 1

A-23 Steam Generator 4 Row Col iigged Ind Elev I EOC6 Volts EOC5 Volts>2 9 41 DSI H03 0.49 0.55 3 34 DSI H03 0.48 0.47 3 58 DSI H05 0.48 0.4 5 32 __ DSI H03 0.48 0.6 5 36

_DSI 103 0.48 0.53 5 62 DSI H03 0.48 0.25 22 58 DSI H02 0.48 0.52 3 63 DSI H02 0.47 0.17 13 51 Y DSI H04 0.47 0.37 15 101 DSI ClI 0.47 0.46 4 70 DSI H02 0.46 0.44 5 40 DSI H03 0.46 0.92 4 1071 DSI H03 0.45 0.46 6 49 y DSI H04 0.45 0.69 16 82 DSI C12 0.45 0.38 20 109 DSI H04 0.45 0.61 9 28 Y DSI H03 0.44 0.74 9 49 DSI H03 0.44 0.67 1 29 DSI 1H03 0.43 0.63 3 40 DSI H05 0.43 0.69 5 42 DSI H03 0.43 0.44 5 55 DSI H02 0.43 0.27 15 55 DSI H02 0.43 0.74 4 13 DSI H03 0.42 0.46 6 49 y DSI H05 0.42 0.49 7 43 DSI H04 0.42 0.34 8 49 DSI H02 0.42 0.28 16 39 DSI H02 0.42 0.61 16 82 DSI H02 0.42 0.56 3 104 DSI H02 0.41 0.37 7 99 DSI H02 0.41 0.58 10 51 DSI CIO 0.41 0.66 17 13 DSI H04 0.41 0.55 17 55 DSI H05 0.41 0.43 5 52 DSI H02 0.4 0.36 11 38 DSI H02 0.4 0.27 13 64 DSI C05 0.4 0.35 35 17 DSI H04 0.4 0.66 7 75 _ _DSI H03 0.39 0.49 12 5 DSI H04 0.39 0.29 1 55 DSI H02 0.38 0.96 4 43 DSI H02 0.38 0.36 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-24 Steam Generator 4 Row Col Iluggedi') Ind Elev I EOC6 Volts EOC5 Volts(2) 4 60 DSI H061 0.38 0.52 22 11 DSI C13 0.38 0.26 32 1031 DSI H02 0.38 0.55 1 57 _ _DSI H04 0.37 0.5 10 78 DSI H03 0.37 0.28 14 32 Y DSI H03 0.37 0.44 1 70 DSI H02 0.36 0.32 5 55 DSI H04 0.36 0.39 12 24 DSI H03 0.36 0.74 6 1131 DSI H03 0.35 0.47 17 79 DSI H04 0.35 0.57 29 62 DSI H04 0.35 0.34 39 79 DSI H02 0.35 0.16 39 97 DSI H06 0.34 0.53 1 83 DSI H04 0.33 0.39 5 97 DSI H03 0.33 0.53 7 40 DSI H03 0.33 0.25 13 40 DSI H02 0.33 0.28 3 39 DSI H05 0.32 0.34 14 29 DSI H05 0.32 0.52 6 110 y DSI H05 0.31 0.28 14 111_ _ DSI H02 0.31 0.22 10 47 y DSI H03 0.3 0.16 3 56 DSI H04 0.29 0.31 3 66 DSI H05 0.29 0.18 4 52 DSI H04 0.29 0.38 9 40 DSI H03 0.28 0.61 9 60 DSI H05 0.28 0.31 12 14 y DSI H05 0.28 0.19 12 49 y DSI 1H02 0.28 0.46 16 35 DSI H02 0.28 0.19 13 84 DSI 1H02 0.27 0.39 14 47 Y DSI H02 0.26 0.42 32 1031 DSI H04 0.25 0.11 39 23 DSI H02 0.25 0.53 13 77 DSI H05 0.24 0.17 14 72 DSI H03 0.24 0.38 4 114 DSI 1H04 0.23 0.54 7 59 DSI C10 0.23 0.42 9 44 D DSI H04 0.22 0.47 14 26 DSI H03 0.22 0.89 14 31 DSI H02 0.22 0.46 Appendix A June 2005 SG-SGDA-05-24 Revision 1

A-25 Steam Generator 4 Row Col Plugged) Ind Elev EOC6 Volts EOC5 Volts(Z' 18 70 DSI H04 0.22 0.14 39 79 DSI H03 0.21 0.32 2 30 DSI H03 0.2 0.23 2 39 DSI H07 0.2 0.16 4 81 y DSI H06 0.19 0.41 5 81 I DSI H03 0.16 0.98 17 1091 DSI H07 0.15 0.25 (1) All indications greater than or equal to 1 volt at EOC-6 were subject to a Plus Point inspection. All indication confirmed by Plus Point inspection were repaired by plugging.

(2) Indications without an EOC5 Volts value were not used in the determination of growth rate.

Appendix A June 2005 SG-SGDA-05-24 Revision I