ML072470566

Calculation 86-9055670-000, Diablo Canyon Unit 1 R14 Voltage-Based ARC 90-Day Report.

ML072470566
Person / Time
Site:	Diablo Canyon
Issue date:	08/20/2007
From:	Adrienne Brown, Fleck J AREVA
To:	Office of Nuclear Reactor Regulation
References
86-9055670-000
Download: ML072470566 (113)

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20697-10 (3/30/06)

A CALCULATION

SUMMARY

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AREVA Document Identifier 86-9055670-000 Title DCPP Unit I R14 Voltage-Based ARC 90-Day Report PREPARED BY: REVIEWED BY:

METHOD: M DETAILED CHECK E INDEPENDENT CALCULATION NAME Alan M Brown 7 NAME Jeffrey M Fleck SIGNATURE ( /4 SIGNATURE TITLE Principal Engineer DATE (' 2j/' " TITLE Manager COST REF. TM, STATEMENT:

CENTER 12742 PAGE(S) 112-113 REVIEWER INDEPENDENCE NAME '-

PURPOSE AND

SUMMARY

OF RESULTS:

This report summarizes the Diablo Canyon Unit 1 - 1R14 inspection of the steam generator tubing with respect to the implementation of the voltage-based repair criteria as specified in NRC Generic Letter 95-05. This document provides the projected probability of burst and leak rate calculations needed for submittal to the NRC. This report provides a non-proprietary summary of the results. The supporting proprietary calculations and necessary code verifications required for safety-related calculations are contained in Reference 23.

Customer Approval, John Arhar THE DOCUMENT CONTAINS ASSUMPTIONS THAT MUST BE VERIFIED PRIOR TO USE ON THE FOLLOWING COMPUTER CODES HAVE BEEN USED IN THIS DOCUMENT: SAFETY-RELATED WORK CODENERSION/REV CODENERSIONIREV II YES Ikr97v30.exe / Version 3.0 pob97v2O.exe / Version 2.0 [ NO AREVA NP Inc., an AREVA and Siemens company Page 1 of 113

86-9055670-000 Page 2 of 113 RECORD OF REVISIONS Revision Number Affected Page(s) Description of Change(s) 000 All Original Release

86-9055670-000 Page 3 of 113 TABLE OF CONTENTS

1.0 INTRODUCTION

........................................................................................................................................... 8 2.0 EXECUTIVE

SUMMARY

............................................................................................................................... 8 3.0 EOC-14 INSPECTION RESULTS AND VOLTAGE GROWTH RATES ............................................... 10 3.1 EOC-14 INSPECTION RESULTS ................................................................................................................... 10 3.2 VOLTAGE GROWTH RATES .......................................................................................................................... 13 3.2.1 SELECTION OF LIMITING GROWTH DISTRIBUTION FOR EACH STEAM GENERATOR ................................. 14 3.2.2 VOLTAGE-DEPENDENT GROWTH ANALYSES FOR CYCLE 14 ................................................................ 15 3.2.3 VOLTAGE-DEPENDENT GROWTH ANALYSES FOR CYCLE 13 ................................................................ 16 3.2.4 DELTA VOLTS ADJUSTMENT .................................................................................................................... 16 3.2.5 GROWTH

SUMMARY

............................................................................................................................... 17 3.3 VOLTAGE DISTRIBUTIONS USED FOR MONTE CARLO ANALYSES ............................................................... 17 3.4 PROBE W EAR CRITERIA .............................................................................................................................. 17 3.5 UPPER VOLTAGE REPAIR LIMIT ................................................................................................................... 19 3.6 NDE UNCERTAINTY DISTRIBUTIONS ............................................................................................................ 19 3.7 +POINT TMTo BOBBIN VOLTAGE CORRELATION ........................................................................................ 19 4.0 DATABASE APPLIED FOR LEAK AND BURST CORRELATIONS .................................................... 78 4.1 CONDITIONAL PROBABILITY OF BURST ......................................................................................................... 78 4.2 PROBABILITY OF LEAK AND CONDITIONAL LEAK RATE ............................................................................... 79 5.0 EOC-14 CONDITION MONITORING, BENCHMARKING OF EOC-14 CONDITIONS AND ASSESSMENT OF POTENTIAL UNDERPREDICTIONS ............................................................................................................. 81 5.1 EOC-14 CONDITION MONITORING RESULTS ............................................................................................ 81 5.2 EOC-14 BENCHMARK CALCULATIONS ......................................................................................................... 81 5.3 ASSESSMENT OF POTENTIAL UNDERPREDICTIONS ................................................................................... 82 6.0 PROBABILITY OF PRIOR CYCLE DETECTION .................................................................................. 91 6.1 UPDATED DCPP POPCD CORRELATION ............................................................................................... 91 6.1.1 ASSESSMENT OF POPCD CHANGES .................................................................................................. 91 6.1.2 ASSESSMENT OF DISAPPEARING FLAWS .............................................................................................. 93 6.2 INPUT TO INDUSTRY POPCD DATABASE .................................................................................................. 93 7.0 EOC-15 PROJECTIONS FOR PROBABILITY OF BURST AND LEAK RATE ...................................... 106 7.1 INPUTS FOR CALCULATIONS ...................................................................................................................... 106 7.2 PROJECTED EOC-15 VOLTAGE DISTRIBUTIONS ......................................................................................... 107 7.3 PROJECTED TUBE BURST PROBABILITY AND LEAK RATE FOR EOC-15 ........................................................ 111

8.0 REFERENCES

.......................................................................................................................................... 112

86-9055670-000 Page 4 of 113 LIST OF TABLES AND FIGURES G lo ssa ry of A cro nym s ............................................................................................................................. 7 Table 3-1: 1R 14 DO S >2 V olts .............................................................................................. 21 Table 3-3: Summary of Inspection and Repair for Tubes Affected by ODSCC at TSPs .................... 27 Table 3-4: Summary of Largest Voltage Growth Rates per EFPY .................................................... 29 Table 3-5: DOS/AONDB Voltage and Growth Distribution by TSP .................................................... 30 Table 3-6: DCPP-1 Voltage Growth for Cycles 9 through 14 ............................................................ 31 Table 3-7: Summary of Independent Cycle 13 Voltage Growth per EFPY ......................................... 32 Table 3-8: Summary of Bounding Growth Distributions ................................................................... 33 Table 3-9: Cycle 14 Voltage Dependent Growth for SG 1-1 ............................................................ 34 Table 3-10: Cycle 14 Voltage Dependent Growth for SG 1-2 .......................................................... 35 Table 3-11: Cycle 14 Voltage Dependent Growth for All SGs ........................................................... 36 Table 3-12: Cycle 13 Voltage Dependent Growth for SG 1-1 (Used for SG 1-1 Leak Rate) ............. 37 Table 3-13: Cycle 13 Voltage Dependent Growth for SG 1-3 (Used for SG 1-3 POB) ...................... 38 Table 3-14: Cycle 13 Voltage Dependent Growth for SG 1-4 (Used for SG 1-4 Leak Rate) .............. 39 Table 3-15: Cycle 13 Voltage Dependent Growth for All SGs (Used for SGs 1-2 and 1-3 Leak Rate) ... 40 Table 3-16: Delta Volts Adjustments Based on Cycle 14 Breakpoints ............................................. 41 Table 3-17: Delta Volts Adjustments Based on Cycle 13 Breakpoints ............................................. 42 Table 3-18: BOC-15 Voltage Distributions Used for POB Calculations ............................................. 43 Table 3-19: BOC-1 5 Voltage Distributions Used for Leak Rate Calculations .................................... 45 Table 3-20: Re-tested DOSs that Failed the Probe Wear Check ...................................................... 47 Table 3-21: New 1 R14 DOSs >=0.5 Volts In Tubes Inspected With a Worn Probe In 1R13 ............. 49 Table 3-22: Summary of New DOS Indications for Probe Wear Comparison ................................... 51 Table 3-23: Summary of ARC In and Out Tube Inspections in 1R13 ............................................... 51 Table 3-24: ND E Uncertainty Distributions ....................................................................................... 52 Table 3-25: 1R 13 AO NDB to DO S in 1R14 ....................................................................................... 53 Figure 3-1: 1R14 As-Found Voltage Distributions SGs 1-1 and 1-2 .................................................. 54 Figure 3-2: 1R14 As-Found Voltage Distributions SGs 1-3 and 1-4 .................................................. 54 Figure 3-3: 1R14 Repaired Voltage Distributions SGs 1-1 and 1-2 .................................................. 55 Figure 3-4: 1R14 Repaired Voltage Distributions SGs 1-3 and 1-4 .................................................. 55 Figure 3-5: 1R14 RTS Voltage Distributions for RPC Confirmed or Not Inspected SGs 1-1 and 1-2 .... 56 Figure 3-6: 1R14 RTS Voltage Distributions for RPC Confirmed or Not Inspected SGs 1-3 and 1-4 .... 56 Figure 3-7: 1R14 RTS Voltage Distributions SGs 1-1 and 1-2 .......................................................... 57 Figure 3-8: 1R14 RTS Voltage Distributions SGs 1-3 and 1-4 .......................................................... 57 Figure 3-9: 1R14 DOS and AONDB vs. TSP Elevation .................................................................... 58

86-9055670-000 Page 5 of 113 Figure 3-10: Cycle 14 Growth Distributions SGs 1-1 and 1-2 .......................................................... 59 Figure 3-11: Cycle 14 Growth Distributions SGs 1-3 and 1-4 .......................................................... 59 Figure 3-12: Cycle 14 Independent Growth Curves -All SGs .......................................................... 60 Figure 3-13: Historical Change in Growth and BOC Voltage - All SGs ............................................. 60 Figure 3-14: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-1 .................... ............................. 61 Figure 3-15: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-2 ................................................. 61 Figure 3-16: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-3 .................................................. 62 Figure 3-17: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-4 ................................................. 62 Figure 3-18: SG 1-1 Cycle 14 Growth vs. BOC Voltage ................................................................... 63 Figure 3-19: SG 1-2 Cycle 14 Growth vs. BOC Voltage ................................................................... 63 Figure 3-20: SG 1-3 Cycle 14 Growth vs. BOC Voltage ................................................................... 64 Figure 3-21: SG 1-4 Cycle 14 Growth vs. BOC Voltage ................................. 64 Figure 3-22: Cycle 14 Growth vs. BOC Voltage for All Steam Generators ......................................... 65 Figure 3-23: SG 1-1 Cycle 14 VDG Breakpoint Analysis Results ..................................................... 66 Figure 3-24: SG 1-2 Cycle 14 VDG Breakpoint Analysis Results ..................................................... 66 Figure 3-25: Composite Cycle 14 VDG Breakpoint Analysis Results ................................................ 67 Figure 3-26: C ycle 14 VDG for SG 1-1 ............................................................................................. 68 Figure 3-27: C ycle 14 V DG for SG 1-2 ............................................................................................. 68 Figure 3-28: C ycle 13 V DG for A ll S G s ............................................................................................. 69 Figure 3-29: SG 1-1 Cycle 13 VDG Breakpoint Analysis Results ..................................................... 70 Figure 3-30: SG 1-3 Cycle 13 VDG Breakpoint Analysis Results ...................................................... 70 Figure 3-31: SG 1-4 Cycle 13 VDG Breakpoint Analysis Results ..................................................... 71 Figure 3-32: Composite Cycle 13 VDG Breakpoint Analysis Results ................................................ 71 Figure 3-33: C ycle 13 V DG for SG 1-1 ............................................................................................ 72 Figure 3-34: C ycle 13 V D G for SG 1-3 ............................................................................................. 72 Figure 3-35: Cycle 13 V DG for SG 1-4 ............................................................................................. 73 Figure 3-36: C ycle 13 V D G 'for A ll SG s ......................................................................... .................... 73 Figure 3-37: 1R14 Probe Wear Voltage Comparison ....................................................................... 74 Figure 3-38: Bobbin Voltage Uncertainty Distributions ..................................................................... 74 Figure 3-39: Inferred Voltage / Measured Voltage Comparison ........................................................ 75 Figure 3-40: +PointTM Indication to Bobbin Voltage Comparison for SG 1-1 ...................................... 76 Figure 3-41: +PointTM Indication to Bobbin Voltage Comparison for SG 1-2 ...................................... 76 Figure 3-42: +PointTM Indication to Bobbin Voltage Comparison for SG 1-3 ...................................... 77 Figure 3-43: +PointTM Indication to Bobbin Voltage Comparison for SG 1-4 ...................................... 77 Table 4-1: Burst Pressure vs. Bobbin Amplitude Correlation ............................................................ 78 Table 4-2: Probability of Leak Correlation ......................................................................................... 79

86-9055670-000 Page 6 of 113 Table 4-3: Leak Rate vs. Bobbin Amplitude Correlation (2405 psi) .................................................. 80 Table 5-1: Inputs for EOC-14 Benchmark Projections ..................................................................... 81 Table 5-2: Summary of 95-05 ARC Calculations As-found vs. Projected EOC-14 ............................ 83 Table 5-3: SG 1-1 BOC-14 Voltage Distribution Used for EOC-14 Benchmark Projections ............... 84 Table 5-4: SGs 1-2, 1-3, and 1-4 BOC-14 Voltage Distributions Used for EOC-14 Benchmark P roje ctio n s .................................................................................................................................... 85 Table 5-5: Cycle 12 Growth Distributions for SG 1-1 ....................................................................... 86 Table 5-6: Composite Cycle 12 Growth Distributions for All SGs ...................................................... 87 Table 5-7: As-found EOC-14 vs. Projected EOC-14 Conditions ...................................................... 88 Figure 5-1: As-found SG 1-1 vs Projected Voltage Distributions (DCPP POPCD) ............................ 89 Figure 5-2: As-found SG 1-2 vs Projected Voltage Distributions (DCPP POPCD) ............................ 89 Figure 5-3: As-found SG 1-3 vs Projected Voltage Distributions (DCPP POPCD) ............................ 90 Figure 5-4: As-found SG 1-4 vs Projected Voltage Distributions (DCPP POPCD) ............................ 90 T able 6-1: 1 R 13 P O P C D R esults ......................................................................................................... 94 Table 6-2: DCPP Composite POPCD Results (through 10 Inspections) ........................................... 95 Table 6-3: POPCD Matrix Table for Tracking Indications Between EOCn and EOCn+1 .......... . . . . . . . . . . . . 96 Table 6-4: 1R13 POPCD Voltage-Specific Summary from 1 R14 Inspection Results ........................ 97 Table 6-5: 1R13 POPCD Summary from 1R14 Inspection Results Regardless of Voltage ................ 98 Table 6-6: DCPP Composite Voltage-Specific POPCD Summary .................................................... 99 Table 6-7: DCPP Composite POPCD Summary Regardless of Voltage ............................................. 100 Table 6-8: DCPP PO PCD Log Logistic Param eters ........................................................................... 101 Table 6-9: New DCPP POPCD Correlation Comparison to Previous POPCD Correlations (Best E s tim ate s) ................................................................................................................................... 10 2 Table 6-10: 1R13 POPCD Results In Industry Format ....................................................................... 103 Table 6-11: DCPP Composite POPCD Results (10 Inspections) In Industry Format .......................... 104 Figure 6-1: 1R13 POPCD Comparison to Composite POPCDs ......................................................... 105 Table 7-1: Inputs for EOC-14 POB and Leak Rate Projections .......................................................... 106 Table 7-2: Projected EOC-15 Voltage Distributions from POB Calculations (DCPP POPCD) ............ 108 Figure 7-1: SG 1-1 EOC-15 Projected Voltage Distribution ................................................................ 109 Figure 7-2: SG 1-2 EOC-1 5 Projected Voltage Distribution ................................................................ 109 Figure 7-3: SG 1-3 EOC-15 Projected Voltage Distribution ................................................................ 110 Figure 7-4: SG 1-4 EOC-15 Projected Voltage Distribution ................................................................ 110 Table 7-3: Projected Leak Rate and Burst Probability at EOC-15 Using DCPP POPCD .................... 111

86-9055670-000 Page 7 of 113 Glossary of Acronyms Term Definition AONDB Axial ODSCC Not Detected by Bobbin ARC Alternate Repair Criteria BOC Beginning of Cycle CDS Computer Data Screening CPDF Cumulative Probability Distribution Function CFR Code of Federal Regulations CLT Cold-Leg Thinning DCPP Diablo Canyon Power Plant DIS Distorted ID Support Signal with possible Indication DOS Distorted OD Support Signal with possible Indication DNF Degradation Not Found EFPD Effective Full Power Day EFPY Effective Full Power Year ECT Eddy Current Test EOC End of Cycle FS Free Span AREVA Framatome Advanced Nuclear Power GL NRC Generic Letter 95-05 GPM Gallons per Minute INR Indication Not Reportable ISI In-service Inspection LRL Lower Repair Limit LU Lookup MSLB Main Steam Line Break NDE Non Destructive Examination NDD No Degradation Detected NRC Nuclear Regulatory Commission ODSCC Outside Diameter Stress Corrosion Cracking PG&E Pacific Gas and Electric Company POB Probability of Burst POD Probability of Detection POPCD Probability of Prior Cycle Detection POL Probability of Leak PWSCC Primary Water Stress Corrosion Cracking RPC Rotating Pancake Coil RSS Retest Support Plate Signal RTS Return to Service SG Steam Generator SER Safety Evaluation Report TS Te~hnical Specification TSP Tube Support Plate VDG Voltage Dependent Growth

86-9055670-000 Page 8 of 113 1.0, Introduction The Diablo Canyon Power Plant (DCPP) Unit 1 completed the fourteenth cycle of operation and subsequent steam generator ISI in May 2007. The unit employs four Westinghouse-designed Model 51 SGs with %-inch OD mill annealed alloy 600 tubing and 3/4-inch carbon steel drilled-hole tube support plates. It should be noted that 1R14 was the last planned inspection of these SGs, as they are to be replaced at EOC-1 5.

In accordance with the Generic Letter 95-05, ARC implementation requires a pre-startup assessment (Ref. 1) and a 90-day post-startup tube integrity assessment. The NRC Generic Letter 95-05, Reference 2, outlines an alternate repair criterion (ARC) for allowing tubes containing ODSCC indications to remain in service if the indications are contained within the TSP structure and the measured Bobbin voltage is <2.0 volts. A complete list of criteria for excluding TSP intersections from ARC application is provided in section 1.b of Reference 2 and in Reference 3. The NRC has approved implementation of the voltage-based repair criteria at both DCPP units per Reference 3. The steam generator TSP inspection results and the postulated MSLB leak rate and tube burst probabilities are summarized in this report. AREVA uses Monte Carlo codes, as described in References 4 and 5, to provide the burst and leak rate analysis simulations. These evaluations are based on the methods in Reference 6 (for burst) and the slope sampling method for calculating the leak rate as defined in Section 9.5 of Reference 8. These evaluations also use the voltage-dependent POPCD (Probability of Prior Cycle Detection) and the new growth methods as defined in References 16, 19, and 25, and approved by the NRC in Reference 20.

2.0 Executive Summary During the 1R14 inspection, a total of 1936 DOS indications were detected with the bobbin coil.

There were an additional 186 support plate intersections that were identified as containing AONDB (axial ODSCC not detected by bobbin). Since there were no DOS indications at these intersections, a bobbin voltage was inferred from the +PointTM results per the methodology provided in Reference 8.

There were 10 DOS indications greater than the lower repair limit of 2.0 volts. All of these indications were confirmed as axial ODSCC with +PointTM and were subsequently plugged. An additional 38 DOS and AONDB indications less than or equal to 2 volts were also plugged for other reasons, located in the wedge region, same TSP as ligament indication, ID/OD at same TSP, AONDB at dent >5 volts, or pluggable indications at another location in the same tube.

No DOS indications were preventively repaired for high +PointTM volts.

A review of the growth rates over the previous cycle shows that axial ODSCC at support plates is most active in SGs 1-1 and 1-2. These two steam generators had the highest average growth rates and the six highest individual growth rates of the entire population. Cycle 14 voltage dependent growth (VDG) was not apparent in any SG based on previously established threshold criteria, although Cycle 14 VDG breakpoints were conservatively established in SGs 1-1 and 1-2. Following the DCPP Unit 2 2R11 inspection in 2003, a significant amount of analysis and evaluation was performed on voltage growth for ODSCC at TSPs (Reference 14).

The evaluations primarily involved statistical breakpoint analyses to determine where the data

86-9055670-000 Page 9 of 113 suggests a change in the slope of the regression curve that defines the growth data. These efforts led to the development of guidelines for determining the breakpoints and growth distributions. These guidelines were provided to the NRC via Reference 24, and were used to determine the breakpoints and growth distributions for the current OA.

The POB and leak rate projections for EOC-15 provided in this report use the DCPP-specific POPCD. The use of the voltage-dependent POPCD was approved in Reference 20. The updated POPCD correlation is provided in Section 6. Using the DCPP-specific POPCD, a conservatively estimated cycle length, and the conservative growth rate analyses discussed in Section 3.2, the projected POB at EOC-14 for the limiting steam generator (SG 1-1) was determined to be 3.48 x 10-4. The projected leak rate for the limiting generator (SG 1-1) was 0.68 gpm. Both of these results are below the acceptance criteria of 1 x 10-2 and 10.5 gpm, respectively.

Section 5 provides the as-found EOC-14 condition monitoring results and results of a benchmarking study that compares the projected EOC-14 conditions to the as-found conditions.

The as-found leak rate and POB at EOC-14 for the limiting steam generator (SG 1-1) were determined to be 0.34 gpm and 1.88 x 104, respectively, and are both below the acceptance criteria of 10.5 gpm and 1 x 10-2. The prior cycle operational assessment was recalculated using the POPCD correlation from the 2R13 90-Day Report (Ref. 18) and as shown in Section 5, the recalculated EOC-14 POB, leak rate, and numbers of indications were conservative in all cases compared to EOC-14 actual conditions.

86-9055670-000 Page 10 of 113 3.0 EOC-14 Inspection Results and Voltage Growth Rates 3.1 EOC-14 Inspection Results The DCPP 1R14 bobbin coil inspection consisted of a 100% full-length bobbin coil examination of in-service tubes in all four steam generators except for Rows 1 and 2 U-bends which were inspected with +PointTM. All in-service TSP intersections in the hot and cold legs were inspected with 0.720" replaceable feet bobbin probes.

Special interest +PointTM examinations were conducted as follows in support of the voltage-based ARC, and in accordance with the Degradation Assessment (Ref. 9) and Surveillance Test Procedure STP M-SGTI (Ref. 12).

0 100% of DOS > 1.7 volts

• 100% of DOS in dented intersections

• 100% of DIS (distorted ID support signal at dented intersection) 0 100% of hot leg SPR (Support Plate Residual) > 2.3 volts; minimum of five largest hot leg SPRs in each steam generator 0 100% of prior cycle AONDB indications 0 100% of new DOS in cold leg thinning region

• Dented TSP examinations 0 Other Special Interest or test programs that may test TSP intersections Based upon the bobbin inspection of all steam generators, a total of 2122 indications were identified. The results of the inspections are summarized as follows:

1) Voltage dependent growth (VDG) was not apparent in any SG based on previously established threshold criteria, although VDG breakpoints were conservatively established in SGs 1-1 and 1-2.

2) 10 DOS indications were greater than the lower repair limit (2.0 volts). Each of the indications confirmed as ODSCC, required repair by plugging, and were distributed as follows: 5 in SG 1-1, 2 in SG 1-2, 3 in 1-3, and none in SG 1-4. Table 3-1 lists the DOS indications that were above the LRL.

3) No indications were identified that exceeded the upper repair limit of 5.57 volts.

4) No indications less than or equal to 2.0 volt bobbin exceeded the 1.9 volt +PointTM threshold for preventive plugging, per industry guidance in Reference 8.

5) 215 indications at 186 TSP intersections were identified as AONDB (axial ODSCC not detected by bobbin). Table 3-2 lists the indications that were identified as AONDB. These are +PointM indications of axial ODSCC that have no signal present in the bobbin coil data (no DOS signal). These locations are typically smaller voltage ODSCC, by +PointTM, and can be accompanied by a dent that masks any bobbin signal. Per Reference 8, a methodology has been developed to assign a bobbin voltage based on a correlation to the

+PointTM voltage. Once the calculated voltages are obtained per Reference 17, the locations are subjected to exclusion criteria defined in Reference 12. All inferred voltages were small, less than about 1.40 equivalent bobbin volts.

86-9055670-000 Page 11 of 113

6) Overall, 48 DOS/AONDB indications were in tubes that were repaired during 1R14. The breakdown is: 13 in SG 1-1, 19 in SG 1-2, 14 in SG 1-3, and 2 in SG 1-4. This population was used in computing the BOC-1 5 distributions for the OA calculations.

The average voltage was 0.66 volts, including AONDB indications. The 1R13 average was also 0.66 volts. The average voltage for new DOS indications was 0.37v, excluding prior AONDB.

Table 3-3 summarizes the voltage distributions for the as-found condition of the indications, the repaired indications, indications returned to service that were either confirmed by +PointTM or not inspected with +PointTM and the total indications returned to service. Ten confirmed DOS had to be repaired because they exceeded the 2-volt repair limit. The main reasons for repair of the other 38 DOS/AONDB included wedge exclusion criterion, AONDB at >5 volt dent, combined ID/OD degradation at the same intersection, or other pluggable tube degradation.

Reference 8 provides guidelines for preventive tube repair of less than or equal to 2.0 volt bobbin indications to reduce the potential for finding large voltage growth rates for indications left in service. PG&E committed to implement the guideline by performing +PointTM inspection of 100% of greater than 1.7 volt bobbin indications, and to repair any +PointTM confirmed ODSCC with +PointTM amplitude greater than 1.9 volts, as this could be near throughwall and potentially result in a large voltagegrowth rate in the next cycle. 31 less than 2.0 volt bobbin indications were therefore +PointmM inspected in 1R14 to meet this commitment. All of the indications were confirmed as ODSCC and the +PointTM and bobbin voltages were reviewed.

Figures 3-38 to 3-41 plot all of the ODSCC +PointTM voltages versus bobbin voltages. For bobbin amplitudes less than 2.0 volts, no +PointTM amplitudes were greater than 1.9 volts.

Therefore, no tubes required preventative plugging per the guideline.

The largest +PointTM amplitude found in 1R14 was 2.37 volts with a DOS voltage of 2.28, and the largest bobbin voltage growth rate was 1.68 v/EFPY.

The +PointTM inspections required for DOS indications were accomplished as a part of the special interest exams. 414 +PointTM inspections were performed where DOS indications were called by bobbin, excluding the AONDB intersections. Of these inspections, 369 were confirmed yielding an overall confirmation rate of about 89%. However, when excluding the cold leg DOS signals from this count (none of which have ever confirmed as crack-like at DCPP), the confirmation rate is 93%, which is typical at DCPP.

The 1R14 +PointTM TSP inspection scope also included intersections with signals that could potentially mask or cause a flaw to be missed or misread. These inspections included dented intersections based on the criteria in the degradation assessment (Ref. 9) and hot leg intersections with support plate residuals (SPR) > 2.3 volts. Per GL 95-05, a large mixed residual is one that could cause a 1.0 volt bobbin signal to be missed or misread, and Plus Point indications found at such intersections require plugging. In Reference 9, DCPP determined that a 2.3 volt SPR is the upper 9 5 th value that could potentially mask bobbin indications > 1.0 volt. Per the inspection requirements specified in References 9 and 12, all hot leg intersections with SPRs with voltages > 2.3 volts were inspected with +PointTM. In addition, References 9 and 12 require that, if there are less than five hot leg SPRs > 2.3 volts in a given steam Xenerator, the five largest hot leg SPRs in that steam generator should be inspected with

+Point . A total of 6 hot leg SPRs --2.3 volts were identified and inspected, with no indications detected. Since none of the steam generators contained five SPRs > 2.3 volts, the five largest

86-9055670-000 Page 12 of 113 hot leg SPRs were inspected in each steam generator resulting in a total of 20 inspected with

+PointTM. Two of the intersections with SPRs <2.3 volts confirmed with small ODSCC indications (AONDB). The +PointTM voltages for these indications were 0.34v for the indication in SG 1-2 R30C41 and 0.18v for the indication in SG 1-4 R13C26. These +PointTM voltages yield inferred bobbin voltages of 0.776v and 0.588v, respectively. These inferred voltages are less than the conservative 1 volt plugging criteria applied for indications detected at support plates with large residual signals.

Figures 3-1 and 3-2 show the as-found voltage distribution (including AONDB) for all indications detected during the 1R14 inspection. Figures 3-3 and 3-4 show the indications removed from service at 1R14. Figures.3-5 and 3-6 illustrate the indications returned to service that were confirmed as axial ODSCC or were not inspected with RPC. Figures 3-7 and 3-8 illustrate all of the indications returned to service following the 1R14 ECT inspection. Table 3-1 lists all of the indications greater than the 2.0-volt lower repair limit. As previously stated, all of these indications were confirmed as axial ODSCC and were removed from service by plugging.

Of all the DOS indications returned to service, the largest bobbin voltage was 1.99 volts. This indication confirmed as two axial ODSCC indications with +PointTM voltages of 1.47 and 0.17 volts. The single largest +PointTM voltage indication returned to service was 1.65 volts, with a corresponding DOS bobbin voltage of 1.72 volts.

There were 483 intersections returned to service that contained confirmed axial ODSCC at dented TSP intersections. 172 were AONDB intersections and 311 were confirmed bobbin DOS indications. 327 of these intersections contained dents <2.0 v and 156 of these intersections contained dents between 2 and 5 volts, and there were no intersections containing

>5 volt dent since it is an exclusion criteria. The largest bobbin voltage indication returned to service with a dent at the same TSP was 1.80 volts and confirmed as a 0.40v SAL. The largest

+PointTM indication with a dent at the same TSP returned to service is 1.18v, and has a corresponding DOS of 1.40 volts.

The DOS voltage distribution as a function of TSP elevation is provided in Table 3-5. Table 3-5 and Figure 3-9 show that the ODSCC mechanism is most active at the lower hot leg TSPs and the number of indications tends to decrease as a function of higher TSP elevations. This distribution shows the typical temperature dependence of ODSCC.

Table 3-5 and Figure 3-9 include a small number of cold leg DOS indications that were NDD by

+PointTM based on the +PointTM inspection of new cold leg DOS (with no prior Plus Point inspections) located in the cold leg thinning region. 100% of cold leg DOS had been +PointTM inspected in the prior inspection (1R13) to define and validate the cold leg thinning region. No cold leg ODSCC has been confirmed by +PointTM to date at DCPP. Non-confirmed bobbin DOS indications in the cold leg are conservatively retained in the ODSCC ARC calculations.

86-9055670-000 Page 13 of 113 3.2 Voltage Growth Rates For projection of leak rates and tube burst probabilities at EOC-14, voltage growth rates were developed from the 1R13 and 1R14 inspection data. Cycle 14 was 1.39 EFPY in length per Reference 12. For repeat indications reported as DOS in both inspections, growth rates were determined based on comparison of the voltages called in 1R13 and 1R14. For indications not reported during the 1R13 inspection (i.e. new at 1R14), the indications were sized using the 1R13 ECT signals based on a lookup review. Lookups were also performed for all of the 1R14 DOS locations that were previously reported as DIS. In both of these cases, an OD component could not be always found in the bobbin lookup results, and these intersections were excluded from the growth distributions.

Table 3-4 provides a summary of indications with the largest growth during Cycle 14. Table 3-5 provides the maximum and average voltage growth distribution by TSP. Table 3-6 provides the average BOC voltage, average growth rate data and average percent growth for the last six cycles at DCPP-2. Figure 3-13 depicts this information graphically.

Table 3-7 shows the voltage independent growth distributions for each SG, the composite distribution for all four SGs, and the cumulative probability distribution function for each distribution. Figures 3-10 and 3-11 show the voltage growth distributions depicted in bar charts.

Figure 3-12 provides the CPDF curves of the voltage growth distributions. Reviewing the Table 3-5 average and maximum voltage growth for all indications for each SG as well as the number of new indications in each SG shows that the ODSCC mechanism is most active in SG 1-1 followed closely by SG 1-2. This phenomenon of a leading SG in plants affected by ODSCC is common in the industry. Reviewing Table 3-6 and Figures 3-10 and 3-11 also supports this conclusion.

As discussed in Section 3.2.1 below, the average Cycle 14 growth rates for each SG were less than the average Cycle 13 growth rates. There were 298 newly reported DOS indications in 1R14, the largest of which was 1.20 volts. These values exclude those intersections which had DIS indications reported in 1R1 3. 297 of these new indications were detected during the 1 R1 3 lookup, sized appropriately, and subsequently included in the growth distributions. There was one new DOS indications that was not detected during the lookup and was, therefore, not included in the growth rate analyses. This indication measured 0.29v with bobbin in SG 1-4 R1OC13 3H. The upper 95% growth rates of all new and repeat indications were 0.174 and 0.201 v/EFPY, respectively. The average growth rates for new and repeat indications were 0.042 and 0.034 v/EFPY, respectively. These data show that the new indications grew at about the same rate as the repeat indications. The slow growth of the repeat indications is reflected in the VDG analysis in Section 3.2.2, which shows that no VDG is apparent in Cycle 14 based on previously established threshold criteria.

86-9055670-000 Page 14 of 113 3.2.1 Selection of Limiting Growth Distributionfor Each Steam Generator In June 2004, PG&E received a set of RAls from the NRC on their submittal for a permanent POPCD approval. The responses to these RAls were provided in Reference

25. In response to one of the questions, PG&E prepared a guideline for determining the appropriate growth distribution to use for the operational assessments. This guideline was used for the determination of the growth rates used for the EOC-15 projections provided in this document. This guideline either meets, or is more conservative than the guidance provided in References 2 and 6 and Enclosure 3 of Reference 24.

The first step in determining the most conservative growth distribution for each steam generator is to compare the SG-specific and the composite growth distributions for each of the last two cycles. These comparisons are initially done without considering the impact of voltage dependent growth. In order to determine which growth distribution to use for each steam generator in the Cycle 15 operational assessment, four different growth curves must be compared (SG-specific for Cycle 13, SG-specific for Cycle 14, composite for Cycle 13, and composite for Cycle 14).

Figures 3-14 through 3-17 provide graphical comparisons of growth for each steam generator. From these figures, it appears that the Cycle 13 growth rates (either SG-specific or composite) are bounding for all cases. Closer examination of the upper tails of the curves, however, shows that the maximum growth rates for SG 1-1 and SG 1-2 and the composite were higher for Cycle 14 than Cycle 13. Therefore, it was not clearly obvious in any case which growth curve was bounding. For all eight calculations to be performed (POB and leak rate for each steam generator), multiple calculations had to be performed with different growth distributions to determine which growth distribution was bounding. There was relatively little difference in the effects of the different growth rates on the POB and leak rate results. This is evidenced by the fact that, for all four steam generators, the growth curve that gave the bounding result for POB was different than the growth rate that gave the bounding result for the leak rate. In general, Cycle 14 growth rates were more limiting for POB due to the indications in the upper tail, but Cycle 13 growth rates were bounding for the leak rate based on the higher average growth rates. The only exception to this observation is SG 1-3 POB. The limiting growth curve for this case was SG 1-3 Cycle 13 growth. Table 3-8 provides a summary showing the limiting growth curve for all calculations performed. The determination of the limiting growth distributions was performed after the voltage dependent growth analyses and application of the "delta volts adjustment" (if applicable).

86-9055670-000 Page 15 of 113 3.2.2 Voltage-Dependent Growth Analyses for Cycle 14 The Cycle 14 growth rates were plotted against the BOC voltage for all steam generators, including a composite curve. Their data are shown in Figures 3-18 through 3-22. A threshold slope of 0.1 was defined in Reference 25 as the point at which voltage-dependent growth should be considered in the operational assessment. As shown in the figures, none of the steam generators exceed this value. However, since the largest growth points in both SG 1-1 and SG 1-2 were in indications in the upper BOC-14 voltage ranges, VDG analyses were conservatively performed for these two steam generators and the composite distribution. SG 1-3 and SG 1-4 both had negative slopes and also had no significant growth rates in any BOC voltage range.

Voltage-dependent growth is not a new concept, and has been documented by the operators of European steam generators affected by ODSCC. Because of their higher repair limits, their data encompass a much broader and higher range of data than at DCPP and the US plants and provides significant basis for the VDG approach.

A significant amount of analysis and evaluation was performed following the 2R1 1 inspection on voltage growth for ODSCC at TSPs. The evaluations primarily involved statistical breakpoint analysis to determine where the data suggests a change in the slope of the regression curve that defines the growth data. These efforts led to the development of a guidelines document for determining the breakpoints. This document was transmitted to the NRC via Enclosure 3 of Reference 24 and currently resides in Reference 8. These methods were used to determine breakpoints for the Cycle 14 growth data.

Cycle 14 VDG breakpoint analyses were performed for SGs 1-1 and 1-2 and for the composite growth distribution (including all steam generators). Figures 3-23 through 3-25 show the scatter charts and the resulting breakpoints for all of these analyses. The analysis for SG 1-1 yielded two breakpoints at 0.49v and 1.62v, and SG 1-2 yielded a single breakpoint at 0.80v. The composite analysis also yielded a single breakpoint at 0.80v. Tables 3-8 through 3-11 and Figures 3-26 through 3-28 provide the growth distributions and cumulative probability distribution function (CPDF) curves, respectively, for the Cycle 14 VDG analyses. These tables and figures reflect the results after application of the delta volts adjustments as discussed in Section 3.2.4 of this report. As shown in Figures 3-26 through 3-28, the growth rates for the higher VDG bins bound the lower bins, indicating it would be conservative to apply voltage dependent growth in EOC-15 projections when Cycle 14 growth is used.

86-9055670-000 Page 16 of 113 3.2.3 Voltage-Dependent Growth Analyses for Cycle 13 As discussed in Section 3.2.1, in some cases, the Cycle 13 growth rates were determined to bound the Cycle 14 growth rates. This section provides the VDG breakpoint analyses for the Cycle 13 growth curves that were used in the EOC-1 5 Monte Carlo analyses.

Tables 3-12 through 3-15 and Figures 3-29 through 3-32 provide the results of the breakpoint analyses for the Cycle 13 growth rates used in the POB and leak rate calculations documented in this report. The Cycle 13 growth rates used include the composite distribution plus SG-specific distributions used for SGs 1-1, 1-3, and 1-4.

These tables are identical to those provided in the 1R13 90 day report (Reference 7). As shown in the figures, SG 1-1 had two breakpoints at 0.5v and 0.98v, SG 1-3 had a single breakpoint of 0.60v, SG 1-4 had a single breakpoint of 1.00v, and the composite distribution yielded two breakpoints at 0.50v and 0.99v. The Cycle 13 CPDF curves are shown in Figures 3-33 through 3-36.

3.2.4 Delta Volts Adjustment Another part of the growth guideline provided in Reference 25 involves implementation of a "delta volts adjustment" when implementing POPCD in operational assessment calculations. The purpose of this adjustment is to account for the possibility that the growth rates may increase over the next operating cycle. The intent of the adjustment procedure is to increase growth in a specific VDG bin when a comparison between cycle N and cycle N-1 indicates such. The growth rate guidelines that PG&E committed to utilize in combination with POPCD do not specifically address the case where growth rates decrease over subsequent cycles. The guidelines were written on the premise that once VDG is experienced, increasing growth would likely continue to occur. This is not the case in comparing Cycles 13 and 14.

The amount of the adjustment is determined by comparing the average growth from Cycle 14 to the average growth from Cycle 13 for each VDG bin. Tables 3-16 and 3-17 provide the details for the Cycle 14 and Cycle 13 breakpoints, respectively. Per the Reference 25 guideline, if the Cycle 14 data has a higher average growth rate than the Cycle 13 data, then the difference between the average growth rates would be added to each growth rate value in the distribution being used prior to binning the data. As shown in these tables, the only bin where an adjustment is required is Bin 2 for SG 1-2. This growth bin shows an increase using both the Cycle 13 and the Cycle 14 breakpoints.

However, the Cycle 13 growth rates for SG 1-2 are not being used. Therefore, the 0.031 v/efpy adjustment shown in Table 3-17 was not used. The Cycle 14 growth rates for SG 1-2 were determined to be bounding for the SG 1-2 POB calculation. Therefore, an adjustment of 0.029 v/EFPY from Table 3-16 was applied to the Bin 2 growth rates for this case.

86-9055670-000 Page 17 of 113 3.2.5 Growth Summary As discussed in Section 3.2.1, multiple calculations had to be performed for each POB and leak rate calculation to determine which growth distribution provided the most limiting POB and leak rate result. The limiting growth rates are shown in Table 3-8.

Tables 3-9 through 3-15 show the growth distributions that were used in the Monte Carlo analyses for EOC-15. These curves are shown graphically in Figures 3-26 through 3-28 and Figures 3-33 through 3-36. As required by Generic Letter 95-05, the negative growth values were included as zero growth rates in the ARC calculations.

3.3 Voltage DistributionsUsed for Monte Carlo Analyses Now that the breakpoints for the growth bins have been established, the BOC-15 voltage distributions to be used in the Monte Carlo simulations can be defined. Table 3-3 shows the voltage distributions for the as-found and repaired indications. However, additional voltage bins must be inserted at the value of the VDG breakpoints. For example, in Table 3-18, additional voltage bins at 0.49v and 1.62v were inserted into the SG 1-1 voltage distribution. Tables 3-18 and 3-19 show the BOC-15 voltage distributions used in the POB and leak rate calculations, respectively. Adding these additional voltage bins forces the Monte Carlo simulation codes to apply each VDG growth distribution to the correct number of indications.

3.4 Probe Wear Criteria In order to maintain consistent detection and sizing capabilities throughout the inspection, probe wear is monitored by following the requirements of Reference 15, which is documented in Reference 13. The first NRC requirement regarding probe wear is to minimize the potential for tubes to be inspected with a probe that had failed the probe wear check. This was accomplished by implementing the bobbin Examination Technique Specification Sheet (ETSS)

1. 1 (Ref. 11), which required the probe have its feet replaced when failing the probe wear check, or in the case of non-changeable feet probes, the probe discarded. Review of the probe wear log sheets and the eddy current test results indicate that no tubes were inspected with a probe known to have failed the probe wear check.

If the DOS voltage is at or above the retest threshold (1.5 volts or higher) and the cal is designated as "ARC Out" on the cal board, the indication code is changed from a DOS to a RSS (retest support plate signal) indicating that a retest is required with a new probe. No new indications were detected in the tubes when retested with the new probe.

The 1R14 eddy current inspection resulted in 48 bobbin indications in excess of 1.5 volts that were inspected with a worn probe, termed as RSS (retest support signal) indications. Table 3-20 shows these RSS indications, including any less than 1.5 volt DOS indications in the same

86-9055670-000 Page 18 of 113 tube inspected with a worn probe, along with the retested DOS indications in a subsequent calibration group with a good probe. Figure 3-37 shows a comparison of the worn probe and good probe voltages. The final acceptable DOS voltage values compare reasonably well with the RSS voltages. In the majority of cases, the voltage of the DOS was lower than the corresponding RSS. The average change between the initial voltages (both DOS and RSS) relative to the final DOS call was 0.30%. There was only one instance (R26C32 in SG 1-1) where the final DOS indication (1.82 volts) exceeded the RSS indication (1.52 volts) by more than 15% (20%).

The next requirement involves monitoring tubes that contain new DOS indications that were inspected with probes that failed the wear check in the previous outage. This evaluation is intended to look for "new" large indications or a non-proportionately large percentage of "new" indications in tubes that failed the check in the previous outage. Table 3-21 shows the new 1R14 DOS indications that were >0.5 volts and were inspected on cal groups that failed the probe wear check in 1R13. As shown in Table 3-21, with the exception of R36C67 in SG 1-1 and R34C21 in SG 1-2, there are no newly reported DOS indications greater than or equal to 1 volt in tubes that were inspected with worn probes in 1R13. The lookup voltages for these tubes were 0.84 volts and 1.05 volts, respectively, showing that the voltage changes were not due to a probe wear condition, but simply a matter of POD. Additionally, about 75% of the new indications were < 0.5 volts in 1R13 based on the historical lookups performed. This also indicates that new indications are more a result of probability of detection rather than whether the tube was inspected with a worn probe in 1R13. The percentages do not indicate that a disproportionate number of new DOS >0.5 are present in tubes that were inspected with a worn probe in the previous outage.

Table 3-22 summarizes new DOS indications for probe wear comparisons. Overall there were 1936 DOS indications detected in the 1R14 inspection. 298 (about 15%) of the DOS indications were newly-reported indications (not reported as DIS or DOS in 1R1 3). Of the 298 total new indications, 153 (about 51%) were in tubes inspected with a worn probe in 1R13 and 145 were in tubes inspected with a good probe in 1R13. Additionally, the number of new indications > 0.5 volts was determined to be 105. Out of these, 45 (about 43%) were in tubes that were inspected with a worn probe in 1R13. This confirms that a tube tested with a worn probe in 1R13 is no more likely to contain a large DOS in 1R14 than a tube tested with a good probe in 1R13.

Additionally, the 1R13 results were reviewed to determine the number of inspections performed with probes that passed and failed the probe wear check. These results are shown in Table 3-

23. This review showed that the number of inspections performed with "ARC OUT" probes was 5794, compared to 9056 inspections that were performed with "ARC IN" probes. This total number of examinations is greater than the number of tubes in service because several tubes have multiple examinations. The ratio of ARC OUT tube inspections to the total number of bobbin inspections is about 0.39 (or 39%). This percentage is nearly equivalent to the percentage of new DOSs that were previously inspected with worn probes (about 51 %). This demonstrates that the number of new indications is not biased towards the tubes that were inspected with worn probes in 1R13.

In summary, the NRC analysis requirements regarding probe wear monitoring were met during the 1R14 bobbin coil inspection and a more stringent wear tolerance is not required at DCPP.

86-9055670-000 Page 19 of 113 3.5 Upper Voltage RepairLimit Per Generic Letter 95-05, the upper repair limit must be calculated prior to each outage. The more conservative of the plant-specific average growth rate per EFPY or 30 percent per EFPY should be used as the anticipated growth rate input for this calculation. Since the average growth rate for Cycle 13 was 10.5%/EFPY (Table 3-6), the required 30%/EFPY was used for the upper repair limit calculation. The structural limit used for this calculation is based on the Addendum 6 database. Based on the following formula, the upper repair limit was calculated to be 5.57v.

VURI. VSL

% VNDE  % VCG 1+ +

100 100 where: VURL = upper voltage repair limit, VNDE = NDE voltage measurement uncertainty = 20%,

VCG = voltage growth anticipated between inspections = 30%/EFPY x 1.63 EFPY = 48.9%,

VSL = voltage structural limit from the burst pressure - Bobbin voltage correlation, where the limit of 9.40 volts was used based on Reference 8.

3.6 NDE UncertaintyDistributions NDE uncertainties must be taken into account when projecting the end-of-cycle voltages for the next operating cycle. The NDE uncertainties used in the calculations of the EOC-15 voltages are described in Reference 6. The acquisition uncertainty was sampled from a normal distribution with a mean of zero, a standard deviation of 7%, and a cutoff limit of 15% based on the use of the probe wear standard. The analyst uncertainty was sampled from a normal distribution with a mean of zero, a standard deviation of 10.3%, and no cutoff limit. These uncertainty distributions are shown in Table 3-24 and Figure 3-38.

3.7 +PointTM to Bobbin Voltage Correlation In the response (Ref. 10) to one of the NRC RAls on the 1R13 90-Day Report, an analysis was performed comparing the +PointTM to bobbin voltage correlation using data from both DCPP units versus data from Unit 1 only. This analysis showed that the voltages obtained from the previous correlation (using data from both units) were slightly non-conservative for Unit 1. In Reference 10, PG&E committed to use the updated Unit 1 correlation during the 1R14 inspection. This correlation from Reference 17 is shown below:

VBobbin-95UCL = V+PT

• 1.194 + 0.348 + VO.000502 + O.O0423(V+PT - 0.368)2 In Reference 19, PG&E committed to providing an assessment in each 90-day report to ensure that the bobbin voltages assigned to AONDB indications continue to be conservative. That is, for those prior cycle AONDB indications that become detectable by bobbin (DOS), this

86-9055670-000 Page 20 of 113 assessment was to include a review of the current cycle bobbin voltages against the expected bobbin voltages assuming that all of these indications grew at the average growth rate for the DOS population.

In 1R14, 21 of the 144 1R13 returned to service AONDB indications were detected with bobbin and were reported as DOS. Table 3-25 provides the comparison of assigned voltages to bobbin voltages. Comparing the 1R13 inferred voltage to the 1R14 DOS voltage, results in an average decrease of -0.07 v/EFPY, which is less than the average growth rate for DOS indications detectable in both inspections, 0.035 v/EFPY. There are a few exceptions that have a higher change between 1R13 inferred versus 1R14 DOS voltage. The most significant of these cases is the indication at 2H in SG 1-3 R23C31. This location had an inferred 1R13 bobbin voltage of 0.73v as compared to a 1R14 DOS voltage of 2.27v, thus yielding an apparent growth rate of 1.11 v/EFPY. In this case, comparing inferred to inferred voltages between the two inspections is more appropriate, since they are from the same technique

(+PointTM) and are not as suspect to influence from the dent signal that exists at these TSPs. In this case, the "inferred to inferred" voltage change is 0.23 v/EFPY which is much more in line with the rest of the growth population. It should also be noted that this location was reported as a 1.75v DIS in 1R13.

As a prudent measure, the bobbin to +PointTM voltage correlation continues to be assessed by comparing the inferred bobbin voltages against the measured bobbin voltages for all of the intersections that had both bobbin DOS indications and +PointTm indications of axial ODSCC.

The 1R14 +PointTM indications were assigned bobbin voltages based on the equation above.

For cases where more than one +PointTM indication was reported at the same intersection, each indication was assigned an inferred voltage. These multiple voltages were then combined via the square root of the sum of the squares method (SRSS) to obtain a single inferred bobbin voltage for those intersections.

These inferred bobbin voltages were then compared to the measured bobbin voltages to ensure that the inferred voltages are generally conservative relative to the measured bobbin voltages.

There were a total of 369 intersections with DOS indications that were confirmed as containing axial ODSCC with +PointTM. In 248 of these 369 cases (about 67%), the inferred voltage was over predicted relative to the measured bobbin voltage. The average difference between the inferred voltages and the measured voltages was a 0.10v over-prediction, indicating conservatism in the voltage correlation across the entire data set.

In 1R14, the largest inferred voltage for an AONDB indication was 1.40v. Since the +PointTM to bobbin voltage correlation was only used for intersections with inferred voltages less than or equal to 1.40v, this is the voltage range of interest for this comparison. When only the inferred voltages less than or equal to 1.40v are considered, 227 of 329 (about 69%) inferred voltages were over predicted relative to the measured voltage. The average difference between the inferred voltages and the measured bobbin voltages for this population was a 0.11v over-prediction.

Figure 3-39 shows these comparisons graphically. This figure shows the inferred voltages plotted against the measured bobbin voltages. The linear regression fit shows that, in the region of interest (<=1.40v inferred volts), the inferred bobbin voltage is comparable to the

86-9055670-000 Page 21 of 113 measured bobbin voltage. Based on the facts that. about 69% of the voltages are over predicted and the average difference in voltages is a 0.11v over-prediction in the range of voltages where it is utilized, the +PointTM to bobbin voltage correlation is shown to provide reasonable and conservative results at 1R14.

Table 3-1: 1R14 DOS >2 Volts SG Row Col Ind Elev Volts 11 1 67 DOS 2H 2.06 11 3 60 DOS 1H 2.15 11 7 62 DOS 1H 2.28 11 10 39 DOS 1H 2.49 11 12 2 DOS 1H 4.2 12 21 82 DOS 1H 3.61 12 25 61 DOS 1H 2.36 13 9 58 DOS 3H 2.06 13 19 90 DOS 1H 2.01 13 23 31 DOS 2H 2.27

86-9055670-000 Page 22 of 113 Table 3-2: 1R14 AONDB Indications

+Pt DentInferred Bobbin Volts Col Elev Ind +Pt Dent Reason for Repair SG Row Volts Voltage Indication Intersection SG11 2 7 3H SAI 0.24 3.85 0.658 0.658 SG11 2 26 2H SAI 0.29 2.33 0.717 0.928 SG11 2 26 2H SAI 0.18 2.33 0.588 SG11 5 91 2H SAI 0.22 2.08 0.635 0.635 SG11 6 93 1H SAI 0.13 0.75 SAI-OD @ 1H Wedge 0.530 0.530 SG11 7 68 1H SAI 0.29 0.5 0.717 1.093 SG11 7 68 1H SAI 0.38 0.5 0.824 SG11 9 43 1H SAI 0.2 1.04 0.612 0.612 SG11 11 85 3H SAI 0.11 2.49 0.507 0.507 SG11 16 58 1H SAI 0.22 3.43 0.635 0.635 SG11 16 69 2H SAI 0.21 0.8 0.623 0.623 SG11 17 13 2H SAI 0.32 1.04 0.753 0.753 SG11 17 28 2H SAI 0.17 3.36 0.577 0.577 SG11 17 80 2H SAI 0.13 2.14 0.530 0.530 SG11 18 31 2H SAI 0.34 2.26 0.776 0.776 SGII 18 76 1H SAI 0.13 0.79 0.530 0.734 SG11 18 76 1H SAI 0.11 0.79 0.507 SG11 20 40 3H SAI 0.15 0.32 0.554 0.554 SG11 20 44 1H SAI 0.32 0.37 0.753 SG11 20 44 1H SAI 0.27 0.37 0.694 1.137 SG11 20 44 1H SAI 0.1 0.37 0.496 SG11 20 52 1H SAI 0.13 3.29 0.530 0.530 SG11 20 62 2H SAI 0.22 3.28 0.635 0.635 SG11 21 77 2H SAI 0.17 1.45 0.577 0.577 SG11 23 38 2H SAI 0.18 4.06 0.588 0.588 SG11 23 54 1H SAI 0.14 1.6 0.542 0.542 SGI1 25 60 1H SAI 0.17 0.98 0.577 0.792 60 1H SAI 0.14 0.98 0.542 SG11 25 SG11 25 71 1H SAI 0.19 0.48 0.600 0.600 SG11 26 28 1H SAI 0.31 4.66 0.741 0.741 SGI1 26 80 1H SAI 0.52 0.38 0.993 0.993 SG11 27 44 2H SAI 0.33 4.34 0.765 0.986 SG11 27 44 2H SAI 0.21 4.34 0.623 SG11 28 36 1H SAI 0.13 0.81 0.530 0.801 SG11 28 36 1H SAI 0.19 0.81 0.600 SG11 28 64 2H SAI 0.3 1.46 0.729 0.937 SG11 28 64 2H SAI 0.18 1.46 0.588 SG11 33 34 1H SAI 0.33 1.71 0.765 0.979 SG11 33 34 1H SAI 0.2 1.71 0.612 SG11 33 68 2H SAI 0.19 0.19 0.600 0.600 SG11 36 42 2H SAI 0.23 1.19 0.647 0.647 SG11 37 56 2H SAI 0.21 1.62 0.623 0.623 SG11 38 49 2H SAI 0.33 0.73 0.765 0.765 SG11 42 48 1H SAI 0.22 0.42 0.635 0.635

86-9055670-000 Page 23 of 113 Table 3-2: 1R14 AONDB Indications

÷Pt DentInferred Bobbin Volts Col Elev Ind Dent Reason for Repair SG Row Volts Voltage Indication Intersection SG12 2 39 1H SAI 0.17 2.3 0.577 0.577 SG12 5 20 6H SAI 0.27 2.55 0.694 0.694 SG12 5 67 3H SAI 0.27 1.22 0.694 0.956 SG12 5 67 3H SAI 0.24 1.22 0.658 SG12 5 72 2H SAI 0.15 1.76 SAI ID/OD@2H 0.554 0.554 SG12 5 91 5H SAI 0.24 3.1 0.658 0.658 SG12 6 14 1H SAI 0.32 2.86 0.753 0.753 SG12 6 49 1H SAI 0.32 2.46 0.753 0.753 SG12 6 63 2H SAI 0.2 1.94 0.612 0.612 SG12 6 67 1H SAI 0.31 3.87 0.741 SG12 6 67 1H SAI 0.18 3.87 0.588 SG12 6 81 1H SAI 0.49 3.87 0.957 0.957 SG12 6 81 5H SAI 0.25 4.3 0.670 0.670 SG12 6 92 1H SAI 0.32 3.74 0.753 0.753 SG12 7 31 1H SAI 0.2 2.25 SAI ID/AONDB@IH 0.612 SG12 7 31 1H SAI 0.21 2.25 SAI ID/AONDB@IH 0.623 SG12 7 54 1H SAI 0.2 3.74 0.612 0.612 SG12 7 80 5H SAI 0.14 2.05 0.542 0.542 SG12 7 90 2H SAI 0.14 2.41 0.542 0.542 SG12 8 17 1H SAI 0.23 3.66 0.647 0.647 SG12 9 33 1H SAI 0.24 2.3 0.658 0.658 SG12 9 45 7H SAI 0.36 2.55 0.800 0.800 SG12 9 55 1H SAI 0.17 1.38 0.577 0.577 SG12 9 76 1H SAI 0.26 2.3 0.682 0.682 SG12 9 84 3H SAI 0.24 2.67 0.658 0.658 SG12 10 43 1H SAI 0.4 1.88 0.848 0.848 SG12 10 45 2H SAI 0.24 1.56 0.658 0.658 SG12 10 68 2H SAI 0.13 2.07 0.530 0.530 SG12 11 18 2H SAI 0.29 3.81 0.717 0.717 SG12 11 40 1H SAI 0.51 4.04 0.981 0.981 SG12 11 61 1H SAI 0.34 2.01 0.776 0.776 SG12 11 75 2H SAI 0.39 3.86 0.836 1.102 SG12 11 75 2H SAI 0.29 3.86 0.717 SG12 11 75 4H SAI 0.17 1.58 0.577 0.577 SG12 11 82 3H SAI 0.13 2.24 SCI-OD @ 4H+0.29 0.530 0.530 SG12 11 91 1H SAI 0.19 3.38 0.600 0.600 SG12 12 76 1H SAI 0.13 3.34 0.530 0.530 SG12 13 66 2H SAI 0.23 3.17 0.647 0.647 SG12 14 7 2H SAI 0.28 3.13 0.705 0.705 SG12 14 79 4H SAI 0.17 2.49 0.577 0.577 SG12 14 80 5H SAI 0.31 3.59 0&741 0.741 SG12 15 85 2H SAI 0.24 3.11 0.658 0.658 SG12 16 55 2H SAI 0.21 2.54 0.623 0.623 SG12 17 37 2H SAI 0.25 1.76 0.670 0.670 SG12 17 70 1H SAI 0.25 2.38 0.670 0.670

86-9055670-000 Page 24 of 113 Table 3-2: 1R14 AONDB Indications

+Pt Dent Inferred Bobbin Volts Col Elev Ind Vot Dolt Reason for Repair SG Row Volts Voltage Indication Intersection SG12 18 14 1H SAI 0.28 1.56 0.705 0.705 SG12 18 22 1H SAI 0.2 3.34 0.612 0.612 SG12 19 70 2H SAI 0.17 3.74 0.577 0.841 SG12 19 70 2H SAI 0.2 3.74 0.612 SG12 20 83 1H SAI 0.28 2.5 0.705 1.085 SG12 20 83 1H SAI 0.38 2.5 0.824 SG12 20 89 4H SAI 0.33 1.82 0.765 0.765 SG12 21 68 2H SAI 0.29 5.29 AONDB @2H & DNT>5 0.717 0.717 SG12 21 72 4H SAI 0.26 1.08 0.682 0.682 SG12 21 87 1H SAI 0.2 1.57 0.612 0,952 SG12 21 87 1H SAI 0.3 1.57 0.729 SG12 22 79 2H SAI 0.22 1.19 0.635 0.635 SG12 22 83 1H SAI 0.24 2.6 0.658 0.658 SG12 23 52 1H SAI 0.17 3.52 0.577 0.577 SG12 23 71 2H SAI 0.16 1.95 0.565 0.833 SG12 23 71 2H SAI 0.2 1.95 0.612 SG12 24 38 1H SAI 0.13 1.07 0.530 0.530 SG12 24 80 3H SAI 0.15 2.99 0.554 0.554 SG12 25 66 2H SAI 0.1 1.04 0.496 0.496 SG12 25 77 4H SAI 0.13 1.67 0.530 0.530 SG12 25 85 2H SAI 0.41 1.46 0.860 0.860 SG12 27 19 1H SAI 0.32 4.21 0.753 0.753 SG12 27 44 1H SAI 0.21 1.53 0.623 0.623 SG12 27 44 2H SAI 0.21 0.83 0.623 0.623 SG12 27 46 3H SAI 0.2 2.77 0.612 0.612 SG12 27 64 1H SAI 0.17 5.3 AONDB @1H & DNT>5 0.577 0.577 SG12 27 66 2H SAI 0.11 2.17 0.507 0.742 SG12 27 66 2H SAI 0.14 2.17 0.542 SG12 27 83 2H SAI 0.26 1.21 0.682 0.682 SG12 27 83 4H SAI 0.13 1.07 0.530 0.530 SG12 28 36 2H SAI 0.24 1.11 0.658 0.658 SG12 28 45 1H SAI 0.21 2.42 0.623 0.623 SG12 28 71 2H SAI 0.31 2.46 0.741 0.741 SG12 29 48 1H SAI 0.18 0.78 0.588 0.588 SG12 29 49 3H SAI 0.18 1.93 0.588 0.588 SG12 29 69 1H SAI 0.34 4.59 0.776 0.776 SG12 30 41 1H SAI 0.34 SPR 0.776 0.776 SG12 31 44 4H SAI 0.22 2.63 0.635 0.635 SG12 31 63 1H SAI 0.46 2.83 0.920 SG12 31 63 1H SAI 0.37 2.83 0.812 1.404 SG12 31 63 1H SAI 0.26 2.83 0.682 SG12 31 69 4H SAI 0.29 3.95 0.717 0.717 SG12 31 80 4H SAI 0.2 4 0.612 0.612 SG12 32 30 2H SAI 0.27 2.14 SAI ID/AONDB@2H 0.694 0.694 SG12 32 59 3H SAI 0.24 0.51 0.658 0.658

86-9055670-000 Page 25 of 113 Table 3-2: IR14 AONDB Indications

+Pt Dent Inferred Bobbin Volts Elev Ind Vot Dolt Reason for Repair SG Row Col Volts Voltage Indication Intersection SG12 33 40 1H SAI 0.29 0.55 0.717 0.717 SG12 33 70 2H SAI 0.23 4.32 0.647 0.874 SG12 33 70 2H SAI 0.18 4.32 0.588 SG12 33 71 4H SAI 0.32 5.06 AONDB @4H & DNT>5 0.753 0.753 SG12 34 66 1H SAI 0.38 3.65 0.824 1.093 SG12 34 66 1H SAI 0.29 3.65 0.717 SG12 34 71 2H SAI 0.25 2.36 0.670 0.670 SG12 34 77 1H SAI 0.11 1.54 0.507 SG12 34 77 1H SAI 0.2 1.54 0.612 0.925 SG12 34 77 1H SAI 0.08 1.54 0.473 SG12 35 50 1H SAI 0.22 0.52 0.635 0.635 SG12 35 72 1H SAI 0.17 1.44 0.577 0.577 SG12 36 60 1H SAI 0.24 4.45 0.658 0.658 SG12 37 45 5H SAI 0.22 1.26 0.635 0.635 SG12 37 54 1H SAI 0.19 4.42 0.600 0.600 SG12 37 67 2H SAI 0.33 5.74 AONDB @2H & DNT>5 0.765 0.765 SG12 38 60 4H SAI 0.2 4.02 0.612 0.612 SG12 39 49 2H SAI 0.4 1.19 0.848 0.848 SG12 39 70 1H-- SAI 0.2 2.21 0.612 0.925 SG12 39 70 1H SAI 0.27 2.21 0.694 SG12 42 44 2H SAI 0.19 2.07 0.600 0.600 SG12 43 34 4H SAI 0.27 1.89 0.694 0.694 SG12 44 55 2H SAI 0.23 2.13 0.647 0.647 SG12 45 42 1H SAI 0.32 1.87 0.753 0.753 SG13 5 20 1H SAI 0.2 3.41 0.612 0.612 SG13 6 36 1H SAI 0.21 3.32 0.623 0.623 SG13 6 79 1H SAI 0.37 4.03 0.812 0.812 SG13 8 22 1H SAI 0.21 3.08 0.623 0.623 SG13 10 68 2H SAI 0.2 1.92 0.612 0.612 SG13 10 79 3H SAI 0.15 1.42 0.554 0.554 SG13 11 76 2H SAI 0.14 2.26 SCI-OD@ TSH-0.01 0.542 0.542 SG13 12 73 3H SAI 0.38 2.07 0.824 0.824 SG13 16 80 2H SAI 0.25 2.23 0.670 0.670 SG13 19 80 1H SAI 0.44 3.2 0.896 0.896 SG13 21 34 1H SAI 0.3 2.24 0.729 0.729 SG13 22 55 1H SAI 0.3 2.39 0.729 0.729 SG13 25 82 1H SAI 0.14 2.83 0.542 0.542 SG13 26 41 1H SAI 0.15 2.02 0.554 0.554 SG13 27 49 1H SAI 0.18 1.69 0.588 0.588 SG13 29 66 1H SAI 0.16 2.23 0.565 0.565 SG14 2 9 3H SAI 0.1 2.28 0.496 0.496 SG14 5 72 2H SAI 0.16 3.76 0.565 0.565 SG14 7 30 1H SAI 0.18 3.7 0.588 0.588 SG14 7 34 1H SAI 0.16 5.69 AONDB @ 1H & DNT>5V 0.565 0.565 SG14 7 38 1H SAI 0.16 4.36 0.565 0.565

86-9055670-000 Page 26 of 113 Table 3-2: 1R14 AONDB Indications

+Pt Dent Inferred Bobbin Volts Elev Ind Vot Dolt Reason for Repair SG Row Col Volts Voltage Indication Intersection SG14 8 43 1H SAI 0.18 1.75 0.588 0.588 SG14 10 35 1H SAI 0.16 2.48 0.565 0.565 SG14 10 93 1H SAI 0.23 2.33 0.647 0.647 SG14 12 31 3H SAI 0.16 1.33 0.565 0.565 SG14 12 32 1H SAI 0.22 2.48 0.635 0.915 SG14 12 32 1H SAI 0.24 2.48 0.658 SG14 12 43 1H SAI 0.12 2.3 0.519 0.519 SG14 13 10 2H SAI 0.12 1.65 0.519 0.519 SG14 13 26 1H SAI 0.18 SPR 0.588 0.588 SG14 13 31 1H SAI 0.23 2.37 0.647 0.647 SG14 13 51 1H SAI 0.21 2.15 0.623 0.623 SG14 14 7 2H SAI 0.43 2.15 0.884 1.014 SG14 14 7 2H SAI 0.1 2.15 0.496 SG14 14 19 3H SAI 0.17 2.86 0.577 0.577 SG14 15 36 1H SAI 0.23 4.57 0.647 0.647 SG14 15 52 1H SAI 0.16 1.89 0.565 0.565 SG14 16 51 1H SAI 0.29 5.45 AONDB 11H & DNT>5V 0.717 0.717 SG14 16 65 2H SAI 0.15 3.1 0.554 0.554 SG14 16 69 2H SAI 0.17 3.27 0.577 0.577 SG14 17 32 1H SAI 0.42 2.02 0.872 0.872 SG14 19 32 1H SAI 0.64 3.78 1.141 1.141 SG14 19 40 1H SAI 0.14 3.52 0.542 0.542 SG14 19 47 1H SAI 0.14 0.27 0.542 0.542 SG14 22 43 1H SAI 0.2 2.71 0.612 0.612 SG14 24 62 1H SAI 0.31 1.79 0.741 0.741 SG14 24 68 1H SAI 0.16 2.46 0.565 0.565 SG14 25 36 1H SAI 0.24 3.12 0.658 0.658 SG14 30 59 1H SAI 0.31 2.4 0.741 0.741 SG14 32 70 1H SAI 0.15 4.35 0.554 0.554 SG14 33 58 1H SAI 0.7 4.12 1.215 1.215 SG14 36 20 1H SAI 0.16 3.04 0.565 0.565 SG14 36 47 1H SAI 0.33 3.55 0.765 0.765 SG14 38 21 1H SAI 0.19 1.94 0.600 0.600 SG14 40 27 1H SAI 0.18 3.89 0.588 0.883 SG14 40 27 1H SAI 0.24 3.89 0.658 SG14 42 54 1H SAI 0.28 3.61 1 0.705 0.705

86-9055670-000 Page 27 of 113 Table 3-3: Summary of Inspection and Repair for Tubes Affected by ODSCC at TSPs Yr II.

SG 1-1 SG 1-2 SG 1-3 DOSs DOSs DOSs As- ReardAs- Returned to Service Repaied Returned to Service

_A-_Reaire Returned to Service Voltage Found ReardFound ReaieoA-n eaie Bin EOC-14 Tubes Conf. ODSCC EOC-14 Tubes Conf. ODSCC Found Tubes Conf. ODSCC or Not Insp Total or Not Insp Total or Not Insp Total W/ +Pt W/ +Pt W/ +Pt 0.1 0 0 0 0 1 0 1 1 0 0 0 0 0.2 21 0 21 21 16 0 16 16 8 0 8 8 0.3 100 1 98 99 50 2 46 48 28 1 25 27 0.4 145 1 143 144 72 1 70 71 49 2 44 47 0.5 120 1 117 119 78 1 75 77 45 0 40 45 0.6 113 3 109 110 99 3 94 96 43 1 40 42 0.7 75 0 74 75 124 2 119 122 21 0 21 21 0.8 70 2 66 68 80 4 75 76 20 0 19 20 0.9 39 0 39 39 58 2 56 56 25 1 22 24 1 45 0 45 45 36 0 36 36 12 1 10 11 1.1 29 0 29 29 27 1 25 26 18 2 15 16 1.2 19 0 19 19 13 0 12 13 6 1 5 5 1.3 26 0 26 26 10 0 10 10 3 0 3 3 1.4 21 0 21 21 3 0 3 3 9 0 9 9 1.5 19 0 19 19 7 0 7 7 3 1 2 2 1.6 6 0 6 6 5 0 5 5 6 1 5 5 1.7 6 0 6 6 4 0 4 4 2 0 2 2 1.8 10 0 10 10 2 1 1 1 2 0 2 2 1.9 7 0 7 7 0 0 0 0 3 0 3 3 2 3 0 3 3 2 0 2 2 0 0 0 0 2.1 1 1 0 0 0 0 0 0 2 2 0 0 2.2 1 1 0 0 0 0 0 0 0 0 0 0 2.3 1 1 0 0 0 0 0 0 1 1 0 0 2.4 0 0 0 0 1 1 0 0 0 0 0 0 2.5 1 1 0 0 0 0 0 0 0 0 0 0 2.6 0 0 0 0 0 0 0 0 0 0 0 0 2.7 0 0 0 0 0 0 0 0 0 0 0 0 2.8 0 0 0 0 0 0 0 0 0 0 0 0 2.9 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 3.1 0 0 0 0 0 0 0 0 0 0 0 0 3.2 0 0 0 0 0 0 0 0 0 0 0 0 3.3 0 0 0 0 0 0 0 0 0 0 0 0 3.4 0 0 0 0 0 0 0 0 0 0 0 0 3.5 0 0 0 0 0 0 0 0 0 0 0 0 3.6 0 0 0 0 0 0 0 0 0 0 0 0 3.7 0 0 0 0 1 1 0 0 0 0 0 0 3.8 0 0 0 0 0 0 0 0 0 0 0 0 3.9 0 0 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 0 0 0 0 5 1 1 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 0 0 0 0 0 0 0 0 0

>7 0 0 0 0 0 0 0 0 0 0 0 0 Total 879 13 858 866 689 19 657 670 306 14 275 292

>1V 151 5 146 146 75 4 69 71 55 8 46 47

>2V 5 5 0 0 2 2 0 0 33 0 0

>4V 1 1 0 0 0 0 0 0 0 0 0 0

86-9055670-000 Page 28 of 113 Table 3-3 (cont): Summary of Inspection and Repair for Tubes Affected by ODSCC at TSPs SG 1-4 Composite of All SGs DOSs DOSs As-As Returned to Service Returned to Service Voltage Found Repaired As-n Repaired Bin EOC-14 Tubes Conf. ODSCC Found Tubes Conf. ODSCC or Not Insp Total or Not Insp Total W/ +Pt WI +Pt 0.1 0 0 0 0 1 0 1 1 0.2 7 0 7 7 52 0 52 52 0.3 28 0 24 28 206 4 193 202 0.4 27 0 24 27 293 4 281 289 0.5 33 0 32 33 276 2 264 274 0.6 45 1 43 44 300 8 286 292 0.7 28 0 28 28 248 2 242 246 0.8 19 1 17 18 189 7 177 182 0.9 17 0 16 17 139 3 133 136 1 10 0 10 10 103 1 101 102 1.1 8 0 8 8 82 3 77 79 1.2 7 0 7 7 45 1 43 44 1.3 5 0 5 5 44 0 44 44 1.4 5 0 5 5 38 0 38 38 1.5 2 0 2 2 31 1 30 30 1.6 3 0 3 3 20 1 19 19 1.7 2 0 2 2 14 0 14 14 1.8 1 0 1 1 15 1 14 14 1.9 0 0 0 0 10 0 10 10 2 1 0 1 1 6 0 6 6 2.1 0 0 0 0 3 3 0 0 2.2 0 0 0 0 1 1 0 0 2.3 0 0 0 0 2 2 0 0 2.4 0 0 0 0 1 1 0 0 2.5 0 0 0 0 1 1 0 0 2.6 0 0 0 0 0 0 0 0 2.7 0 0 0 0 0 0 0 0 2.8 0 0 0 0 0 0 0 0 2.9 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 3.1 0 0 0 0 0 0 0 0 3.2 0 0 0 0 0 0 0 0 3.3 0 0 0 0 0 0 0 0 3.4 0 0 0 0 0 0 0 0 3.5 0 0 0 0 0 0 0 0 3.6 0 0 0 0 0 0 0 0 3.7 0 0 0 0 1 1 0 0 3.8 0 0 0 0 0 0 0 0 3.9 0 0 0 0 0 0 0 0 4 0 0 0 0 0 0 0 0 5 0 0 0 0 1 1 0 0 6 0 0 0 0 0 0 0 0 7 0 0 0 0 0 0 0 0

>7 0 0 0 0 0 0 0 0 Total 248 2 235 246 2122 48 2025 2074

>1V 34 0 34 34 315 17 295 298

>2V 0 0 0 0 10 10 0 0

>4V 0 0 0 0 1 1 0 0

86-9055670-000 Page 29 of 113 Table 3-4: Summary of Largest Voltage Growth Rates per EFPY SG Row Col Elev Volts Prev Volts (1R13) Growth/ Plus Pt New?

___f EP [Results 11 12 2 1H 4.20 1.86 1.683 SAI Repeat 12 21 82 1H 3.61 1.37 1.612 SAI Repeat 12 25 61 1H 2.36 1.03 0.957 SAI Repeat 11 10 39 1H 2.49 1.48 0.727 SAI Repeat 11 7 62 1H 2.28 1.30 0.705 SAI Repeat 11 5 4 1H 1.29 0.41 0.633 Not Insp Repeat 13 41 63 2H 1.17 0.36 0.583 SAI Repeat

86-9055670-000 Page 30 of 113 Table 3-5: DOS/AONDB Voltage and Growth Distribution by TSP SG 1-1 SG 1-2 Tube Tube Support No. of Max Average Max Average Support No. of Max Average Max Average Plate Indications Voltage Voltage Growth/ Growth/ Plate Indications Voltage Voltage EFPh GFwh EFPY EFPY EFPY EFPY 1H 502 4.20 0.75 1.68 0.05 1H 292 3.61 0.71 1.61 0.05 2H 245 2.06 0.57 0.43 0.04 2H 198 1.94 0.65 0.38 0.03 3H 80 1.48 0.54 0.21 0.03 3H 93 1.74 0.62 0.36 0.03 4H 36 1.10 0.51 0.19 0.04 4H 59 1.65 0.59 0.21 0.02 5H 4 0.60 0.46 0.12 0.06 5H 28 1.01 0.59 0.14 0.02 6H 4 0.65 0.47 0.15 0.03 6H 11 0.69 0.55 0.15 0.01 7H 1 0.28 0.28 0.04 0.04 7H 2 0.80 0.79 0.04 0.04 CL 7 0.73 0.51 0.11 0.02 CL 6 1.02 0.59 0.08 0.02 All Inds 879 4.20 0.67 1.68 0.04 All Inds 689 3.61 0.66 1.61 0.04 SG 1-3 SG 1-4 Tube Tube Supr o f Mx Aeae Max Average Support No. of Max Average Maxth Avrageh Support No. of Max Average Growth/ Growth/ Plate Indications Voltage Voltage EFPY EFPY Plate Indications Voltage Voltage EFPY EFPY N EFPY EFPY 1H 148 2.01 0.69 0.50 0.01 1H 136 1.74 0.68 0.29 0.03 2H 70 2.27 0.66 0.58 0.02 2H 51 1.37 0.61 0.27 0.02 3H 29 2.06 0.82 0.21 0.02 3H 26 1.65 0.69 0.13 0.03 4H 22 1.59 0.59 0.09 0.01 4H 17 1.96 0.54 0.33 0.06 5H 19 1.83 0.59 0.22 0.01 5H 7 0.74 0.45 0.05 -0.01 6H 6 0.78 0.46 0.06 0.00 6H 3 0.59 0.42 0.04 0.01 7H 1 0.71 0.71 0.03 0.03 7H 0 0.00 0.00 0.00 0.00 CL 11 1.01 0.52 0.10 0.02 CL 8 0.71 0.40 0.07 0.03 All Inds 306 2.27 0.67 0.58 0.02 All Inds 248 1.96 0.64 0.33 -F0.03 Composite of All Four SGs Tube Support Max Average No. of Max Average Plate Growth/ Growth/

Indications Voltage Voltage EFPY EFPY 1H 1078 4.20 0.72 1.68 0.04 2H 564 2.27 0.61 0.58 0.03 3H 228 2.06 0.63 0.36 0.03 4H 134 1.96 0.56 0.33 0.03 5H 58 1.83 0.57 0.22 0.01 6H 24 0.78 0.50 0.15 0.01 7H 4 0.80 0.64 0.04 0.04 CL 32 1.02 0.50 0.11 0.02 All Inds 2122 4.20 0.66 1.68 0.04

86-9055670-000 Page 31 of 113 Table 3-6: DCPP-1 Voltage Growth for Cycles 9 through 14 SG 1-1 SG 1-2 SG 1-3 SG 1-4 All Avg BOC Volts 0.281 0.307 0.457 0.327 0.343 Cycle 9 Average Growth Per EFPY 0.113 0.072 0.127 0.151 0.102 Average Percent Growth Per EFPY 40.2% 23.3% 27.8% 46.0% 29.6%

Avg BOC Volts 0.350 0.405 0.602 0.546 0.437 Cycle 10 Avg Growth Per EFPY 0.171 0.135 0.123 0.108 0.143 Average Percent Growth Per EFPY 49.0% 33.3% 20.4% 19.8% 32.8%

Avg BOC Volts 0.440 0.548 0.653 0.500 0.515 Cycle 11 Avg Growth Per EFPY 0.127 0.091 0.066 0.085 0.102 Average Percent Growth Per EFPY 28.8% 16.6% 10.1% 17.0% 19.8%

Avg BOC Volts 0.488 0.565 0.664 0.484 0.535 Cycle 12 Avg Growth Per EFPY 0.178 0.091 0.068 0.132 0.130 Average Percent Growth Per EFPY 36.4% 16.0% 10.6% 27.2% 24.3%

Avg BOC Volts 0.589 0.589 0.621 0.555 0.590 Cycle 13 Avg Growth Per EFPY 0.070 0.043 0.061 0.079 0.062 Average Percent Growth Per EFPY 11.9% 7.3% 9.8% 14.2% 10.5%

Avg BOC Volts 0.605 0.603 0.653 0.598 0.611 Cycle 14 Avg Growth Per EFPY 0.043 0.037' 0.015 0.028 0.035 Average Percent Growth Per EFPY 7.1% 6.1% 2.3% 4.7% 5.7%

86-9055670-000 Page 32 of 113 Table 3-7: Summary of Independent Cycle 13 Voltage Growth per EFPY SG 1-1 SG 1-2 SG 1-3 SG 1-4 Total Delta Volts per EFPY No. of CPDF No. of CPDF No. of CPDF No. of CPDF No. of CPDF Obs. Obs. Obs. Obs. Obs.

<=0.0 286 0.339 220 0.376 133 0.460 73 0.349 712 0.369 0.1 400 0.813 245 0.795 121 0.879 105 0.852 871 0.821 0.2 108 0.941 94 0.956 20 0.948 26 0.976 248 0.950 0.3 33 0.980 18 0.986 8 0.976 4 0.995 63 0.983 0.4 10 0.992 5 0.995 3 0.986 1 1.000 19 0.993 0.5 3 0.995 1 0.997 3 0.997 0 1.000 7 0.996 0.6 0 0.995 0 0.997 1 1.000 0 1.000 1 0.997 0.7 1 0.996 0 0.997 0 1.000 0 1.000 1 0.997 0.8 2 0.999 0 0.997 0 1.000 0 1.000 2 0.998 0.9 0 0.999 0 0.997 0 1.000 0 1.000 0 0.998 1 0 0.999 1 0.998 0 1.000 0 1.000 1 0.999 1.1 0 0.999 0 0.998 0 1.000 0 1.000 0 0.999 1.2 0 0.999 0 0.998 0 1.000 0 1.000 0 0.999 1.3 0 0.999 0 0.998 0 1.000 0 1.000 0 0.999 1.4 0 0.999 0 0,998 0 1.000 0 1.000 0 0.999 1.5 0 0.999 0 0.998 0 1.000 0 1.000 0 0.999 1.6 0 0.999 0 0.998 0 1.000 0 1.000 0 0.999 1.7 1 1.000 1 1.000 0 1.000 0 1.000 2 1.000 1.8 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 1.9 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.1 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.2 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.3 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.4 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.5 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.6 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.7 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.8 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 2.9 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3.1 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3.2 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3.3 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3.4 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 3.5 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000

>3.5 0 1.000 0 1.000 0 1.000 0 1.000 0 1.000 Total 844 NA 1585 NA 289 [NA I[ 209 NA I 1927 NA upper 95% 0.209 0.194 0.203 0.144 0.194 Growth

86-9055670-000 Page 33 of 113 Table 3-8: Summary of Bounding Growth Distributions SG Bounding Growth Rates Used in Monte Carlo Simulations POB Leak Rate SG 1-1 SG 1-1 Cycle 14 SG 1-1 Cycle 13 SG 1-2 SG 1-2 Cycle 14 Composite Cycle 13 SG 1-3 SG 1-3 Cycle 13 Composite Cycle 13 SG 1-4 Composite Cycle 14 SG 1-4 Cycle 13

86-9055670-000 Page 34of 113 Table 3-9: Cycle 14 Voltage Dependent Growth for SG 1-1 (used for SG 1-1 POB)

Growth BOC Voltage per EFPY <=0.49v 0.5tol.62v >1.62v

<=0 140 141 5 0.1 222 170 8 0.2 42 64 2 0.3 16 17 0 0.4 1 9 0 0.5 0 3 0 0.6 0 0 0 0.7 1 0 0 0.8 0 2 0 0.9 0 0 0 1 0 0 0 1.1 0 0 0 1.2 0 0 0 1.3 0 0 0 1.4 0 0 0 1.5 0 0 0 1.6 0 0 0 1.7 0 0 1 1.8 0 0 0 1.9 0 0 0 2 0 0 0

>2 0 0 0 Total 422 1 406 16

86-9055670-000 Page 35 of 113 Table 3-10: Cycle 14 Voltage Dependent Growth for SG 1-2 (used for SG 1-2 POB)

Growth BOC Voltage per EFPY <=0.8v >0.8v

<=0 161 37 0.1 205 50 0.2 74 30 0.3 13 7 0.4 4 1 0.5 0 0 0.6 0 1 0.7 0 0 0.8 0 0 0.9 0 0 1 0 1 1.1 0 0 1.2 0 0 1.3 0 0 1.4 0 0 1.5 0 0 1.6 0 0 1.7 0 1 1.8 0 0 1.9 0 0 2 0 0

>2 0 0 Total 457 128

86-9055670-000 Page 36 of 113 Table 3-11: Cycle 14 Voltage Dependent Growth for All SGs (used for SG 1-4 POB)

Growth BOC Voltage per EFPY <=0.8v >0.8v

<=0 520 192 0.1 730 179 0.2 153 57 0.3 42 21 0.4 9 10 0.5 3 4 0.6 1 0 0.7 1 0 0.8 0 2 0.9 0 0 1 0 1 1.1 0 0 1.2 0 0 1.3 0 0 1.4 0 0 1.5 0 0 1.6 0 0 1.7 0 2 1.8 0 0 1.9 0 0 2 0 0

>2 0 0 Total 1459 468

86-9055670-000 Page 37 of 113 Table 3-12: Cycle 13 Voltage Dependent Growth for SG 1-1 (Used for SG 1-1 Leak Rate)

Cycle 13 Data Growth (volts/EFPY) Bin1 Bin2 Bin3

(<=0.5v) (0.5v-0.98v) (>0.98v)

<0 107 70 15 0.1 198 94 29 0.2 68 62 29 0.3 12 20 18 0.4 3 4 4 0.5 1 0 5 0.6 0 1 0 0.7 0 0 0 0.8 0 1 0 0.9 0 0 2 1 0 0 0 1.1 0 1 0 1.2 0 0 0 1.3 0 0 0 1.4 0 0 0 1.5 0 0 0 1.6 0 0 0 1.7 0 0 0 1.8 0 0 0 1.9 0 0 0 2 0 0 0

>2 0 0 0 Total 389 253 102

86-9055670-000 Page 38 of 113 Table 3-13: Cycle 13 Voltage Dependent Growth for SG 1-3 (Used for SG 1-3 POB)

Cycle 13 Data Growth (volts/EFPY) Bin1 Bin2

(<=0.6v) (>0.6v)

<0 39 34 0.1 72 32 0.2 27 19 0.3 .12 8 0.4 3 2 0.5 0 4 0.6 0 2 0.7 0 1 0.8 0 0 0.9 0 0 1 0 0 1.1 0 0 1.2 0 0 1.3 0 0 1.4 0 0 1.5 0 0 1.6 0 0 1.7 0 0 1.8 0 0 1.9 0 0 2 0 0

>2 0 0 Total 153 102

86-9055670-000 Page 39 of 113 Table 3-14: Cycle 13 Voltage Dependent Growth for SG 1-4 (Used for SG 1-4 Leak Rate)

Cycle 13 Data Growth (volts/EFPY) Bin1 Bin2

(<=lv) (>lv)

<0 41 3 0.1 64 6 0.2 30 3 0.3 16 6 0.4 1 3 0.5 0 1 0.6 0 1 0.7 0 0 0.8 0 0 0.9 0 0 1 0 0 1.1 0 0 1.2 0 0 1.3 0 0 1.4 0 0 1.5 0 0 1.6 0 0 1.7 0 0 1.8 0 0 1.9 0 0 2 0 0

>2 0 0 Total 152 23

86-9055670-000 Page 40 of 113 Table 3-15: Cycle 13 Voltage Dependent Growth for All SGs (Used for SGs 1-2 and 1-3 Leak Rate)

Cycle 13 Data, Growth (volts/EFPY) Bin1 Bin2 Bin3

(<=0.5v) (0.5v-0.99v) (>0.99v)

<0 234 183 62 0.1 431 219 58 0.2 152 125 47 0.3 33 47 33 0.4 8 9 9 0.5 3 7 6 0.6 0 2 3 0.7 0 0 1 0.8 0 1 1 0.9 0 0 2 1 0 0 0 1.1 0 1 0 1.2 0 0 0 1.3 0 0 0 1.4 0 0 0 1.5 0 0 0 1.6 0 0 0 1.7 0 0 0 1.8 0 0 0 1.9 0 0 0 2 0 0 0

>2 0 0 0 Total 861 594 222

86-9055670-000 Page 41 of 113 Table 3-16: Delta Volts Adjustments Based on Cycle 14 Breakpoints SG Cycle Breakpoint(s) Average Growth (Volts per EFPY)

Bin1 Bin2 Bin3 Cycle 13 0.049 0.088 0.192 SG11 Cycle 14 0.49/1.62 0.036 0.047 0.112 Delta <0 <0 <0 Cycle 13 0.053 0.004 SG12 Cycle 14 0.8 0.038 0.033 NA Delta <0 0.029 Cycle 13 0.061 SG13 Cycle 14 NA 0.015 NA NA Delta <0 Cycle 13 0.079 SG14 Cycle 14 NA 0.028 NA NA Delta <0 Cycle 13 0.056 0.081 Composite Cycle 14 0.8 0.034 0.040 NA Delta <0 <0

86-9055670-000 Page 42 of 113 Table 3-17: Delta Volts Adjustments Based on Cycle 13 Breakpoints SG Cycle Breakpoint(s) Average Growth (Volts per EFPY)

Bin1 Bin2 Bin3 Cycle 13 0.049 0.072 0.146 SG11 Cycle 14 0.50 /0.98 0.036 0.030 0.090 Delta <0 <0 <0 Cycle 13 0.042 0.062 SG12 Cycle 14 1.25 0.035 0.093 NA Delta <0 0.031 Cycle 13 0.060 0.063 SG13 Cycle 14 0.6 0.029 -0.001 NA Delta <0 <0 Cycle 13 0.065 0.170 SG14 Cycle 14 1 0.029 0.023 NA Delta <0 <0 Cycle 13 0.052 0.063 0.095 Composite Cycle 14 0.50 / 0.99 0.039 0.021 0.059 Delta <0 <0 <0

86-9055670-000 Page 43 of 113 Table 3-18: BOC-15 Voltage Distributions Used for POB Calculations SG 1-1 SG 1-2 SG 1-3 SG 1-4 Voltage As-Found Repaired Voltage As-Found Repaired As-Found Repaired As-Found Repaired Bin Bin 0.1 0 0 0.1 1 0 0 0 0 0 0.2 21 0 0.2 16 0 8 0 7 0 0.3 100 1 0.3 50 2 28 1 28 0 0.4 145 1 0.4 72 1 49 2 27 0 0.49 113 1 0.5 78 1 45 0 33 0 0.5 7 0 0.6 99 3 43 1 45 1 0.6 113 3 0.7 124 2 21 0 28 0 0.7 75 0 0.8 80 4 20 0 19 1 0.8 70 2 0.9 58 2 25 1 17 0 0.9 39 0 1 36 0 12 1 10 0 1 45 0 1.1 27 1 18 2 8 0 1.1 29 0 1.2 13 0 6 1 7 0 1.2 19 0 1.3 10 0 3 0 5 0 1.3 26 0 1.4 3 0 9 0 5 0 1.4 21 0 1.5 7 0 3 1 2 0 1.5 19 0 1.6 5 0 6 1 3 0 1.6 6 0 1.7 4 0 2 0 2 0 1.62 3 0 1.8 2 1 2 0 1 0 1.7 3 0 1.9 0 0 3 0 0 0 1.8 10 0 2 2 0 0 0 1 0 1.9 7 0 2.1 0 0 2 2 0 0 2 3 0 2.2 0 0 0 0 0 0 2.1 1 1 2.3 0 0 1 1 0 0 2.2 1 1 2.4 1 1 0 0 0 0 2.3 1 1 2.5 0 0 0 0 0 0 2.4 0 0 2.6 0 0 0 0 0 0

86-9055670-000 Page 44 of 113 Table 3-18: BOC-15 Voltage Distributions Used for POB Calculations SG 1-1 SG 1-2 SG 1-3 SG 1-4 Voltge A-Foud Rpaird Bioltage_

Voltage As-Found Repaired As-Found Repaired As-Found Repaired As-Found Repaired Bin Bin 1 2.5 1 1 2.7 0 0 0 0 0 0 2.6 0 0 2.8 0 0 0 0 0 0 2.7 0 0 2.9 0 0 0 0 0 0 2.8 0 0 3 0 0 0 0 0 0 2.9 0 0 3.1 0 0 0 0 0 0 3 0 0 3.2 0 0 0 0 0 0 3.1 0 0 3.3 0 0 0 0 0 0 3.2 0 0 3.4 0 0 0 0 0 0 3.3 0 0 3.5 0 0 0 0 0 0 3.4 0 0 3.6 0 0 0 0 0 0 3.5 0 0 3.7 1 1 0 0 0 0 3.6 0 0 3.8 0 0 0 0 0 0 3.7 0 0 3.9 0 0 0 0 0 0 3.8 0 0 4 0 0 0 0 0 0 3.9 0 0 Total 689 19 306 14 248 2 4 0 0 4.1 0 0 4.2 1 1 4.3 0 0 4.4 0 0 4.5 0 0 Total ] 879 13

86-9055670-000 Page 45 of 113 Table 3-19: BOC-15 Voltage Distributions Used for Leak Rate Calculations SGI1-1 SG 1-2 .SG 1-3 SG 1-4 Voltage As-Found Repaired Voltage As-Found Repaired As-Found Repaired Binag As-FundRepire Bin Bin Botgi A-nn Rpie 0.1 0 0 0.1 1 0 0 0 0.1 0 0 0.2 21 0 0.2 16 0 8 0 0.2 7 0 0.3 100 1 0.3 50 2 28 1 0.3 28 0 0.4 145 1 0.4 72 1 49 2 0.4 27 0 0.5 120 1 0.5 78 1 45 0 0.5 33 0 0.6 113 3 0.6 99 3 43 1 0.6 45 1 0.7 75 0 0.7 124 2 21 0 0.7 28 0 0.8 70 2 0.8 80 4 20 0 0.8 19 1 0.9 39 0 0.9 58 2 25 1 0.9 17 0 0.98 34 0 0.99 35 0 12 1 1 10 0 1 11 0 1 1 0 18 2 1.1 8 0 1.1 29 0 1.1 27 1 6 1 1.2 7 0 1.2 19 0 1.2 13 0 3 0 1.3 5 0 1.3 26 0 1.3 10 0 9 0 1.4 5 0 1.4 21 0 1.4 3 0 3 1 1.5 2 0 1.5 19 0 1.5 7 0 6 1 1.6 3 0 1.6 6 0 1.6 5 0 2 0 1.7 2 0 1.7 6 0 1.7 4 0 2 0 1.8 1 0 1.8 10 0 1.8 2 1 3 0 1.9 0 0 1.9 7 0 1.9 0 0 0 0 2 1 0 2 3 0 2 2 0 2 2 2.1 0 0 2.1 1 1 2.1 0 0 0 0 2.2 0 0 2.2 1 1 2.2 0 0 1 1 2.3 0 0 2.3 1 1 2.3 0 0 0 0 2.4 0 0 2.4 0 0 2.4 1 1 0 0 2.5 0 0 2.5 1 1 2.5 0 0 0 0 2.6 0 0 2.6 0 0 2.6 0 0 0 0 2.7 0 0

86-9055670-000 Page 46 of 113 Table 3-19: BOC-15 Voltage Distributions Used for Leak Rate Calculations SG 1-1 SG 1-2 SG 1-3 SG 1-4 Volte As-Found Repaired Voltage As-Found Repaired As-Found Repaired Voltge As-Found Repaired Vla Bin Bin 2.7 0 0 2.7 0 0 0 0 2.8 0 0 2.8 0 0 2.8 0 0 0 0 2.9 0 0 2.9 0 0 2.9 0 0 0 0 3 0 0 3 0 0 3 0 0 0 0 3.1 0 0 3.1 0 0 3.1 0 0 0 0 3.2 0 0 3.2 0 0 3.2 0 0 0 0 3.3 0 0 3.3 0 0 3.3 0 0 0 0 3.4 0 0 3.4 0 0 3.4 0 0 0 0 3.5 0 0 3.5 0 0 3.5 0 0 0 0 3.6 0 0 3.6 0 0 3.6 0 0 0 0 3.7 0 0 3.7 0 0 3.7 1 1 0 0 3.8 0 0 3.8 0 0 3.8 0 0 0 0 3.9 0 0 3.9 0 0 3.9 0 0 0 0 4 0 0 4 0 0 4 0 0 0 0 Total 248 2 4.1 0 0 Total 689 19 306 14 4 J *h. .IL 4.2 1 1 4.3 0 0 4.4 0 0 4.5 0 0 Total 879 j 13

86-9055670-000 Page 47 of 113 Table 3-20: Re-tested DOSs that Failed the Probe Wear Check SG Row 7

9 I _ Col 62 67 Elev 1H 1H 1 RSS IWorn Ind RSS Volts 2.19 Probe 1.52 Cal 1 CL-23 I CL-23 Ind DOS DOS Volts Good Probe 2.28 1.46 Cal 1 CL-29 CL-30 Diff 4.1%

-3.9%

10 39 1H RSS 2.52 CL-27 DOS 2.49 CL-40 -1.2%

10 39 2H DOS 0.56 CL-27 DOS 0.56 CL-40 0.0%

10 39 3H DOS 0.71 CL-27 DOS 0.71 CL-40 0.0%

10 68 1H RSS 1.57 CL-24 DOS 1.57 CL-40 0.0%

10 68 4C DOS 0.56 CL-24 DOS 0.54 CL-40 -3.6%

11 65 1H RSS 1.95 CL-23 DOS 1.99 CL-29 2.1%

15 65 1H RSS 1.71 CL-15 DOS 1.72 CL-30 0.6%

19 44 1H RSS 1.64 CL-18 DOS 1.57 CL-40 -4.3%

19 44 2H DOS 0.58 CL-18 DOS 0.49 CL-40 -15.5%

19 60 1H RSS 1.54 CL-15 DOS 1.43 CL-40 -7.1%

20 47 1H RSS 1.71 CL-18 DOS 1.76 CL-40 2.9%

23 28 1H RSS 1.89 CL-17 DOS 1.74 CL-40 -7.9%

23 41 1H RSS 1.67 CL-17 DOS 1.72 CL-40 3.0%

23 51 1H RSS 1.83 CL-21 DOS 1.71 CL-29 -6.6%

24 17 1H RSS 1.85 CL-20 DOS 1.93 CL-39 4.3%

25 39 1H RSS 1.7 CL-17 DOS 1.75 CL-40 2.9%

25 44 1H RSS 1.82 CL-17 DOS 1.81 CL-40 -0.5%

25 69 1H RSS 1.7 CL-15 DOS 1.86 CL-29 9.4%

SG 1-1 26 32 1H RSS 1.52 HL-9 DOS 1.82 CL-29 19.7%

26 46 1H RSS 1.9 HL-11 DOS 1.76 CL-40 -7.4%

26 60 1H RSS 1.81 CL-13 DOS 1.66 CL-40 -8.3%

26 60 2H DOS 0.25 CL-13 DOS 0.3 CL-40 20.0%

29 29 2H RSS 1.73 HL-9 DOS 1.62 CL-40 -6.4%

29 41 1H RSS 1.84 HL-11 DOS 1.87 CL-40 1.6%

29 43 1H RSS 1.77 HL-11 DOS 1.86 CL-30 5.1%

30 31 1H RSS 1.54 HL-10 DOS 1.46 CL-40 -5.2%

30 31 2H DOS 0.68 HL-10 DOS 0.7 CL-40 2.9%

33 43 1H RSS 1.59 HL-11 DOS 1.79 CL-29 12.6%

35 61 2H RSS 1.6 CL-13 DOS 1.46 CL-29 -8.8%

37 41 1H RSS 1.69 HL-11 DOS 1.6 CL-40 -5.3%

37 41 2H DOS 0.43 HL-11 DOS 0.34 CL-40 -20.9%

37 41 3H DOS 0.28 HL-11 DOS 0.35 CL-40 25.0%

37 41 6H DOS 0.37 HL-11 DOS 0.42 CL-40 13.5%

38 36 1H RSS 1.59 HL-11 DOS 1.5 CL-40 -5.7%

38 36 2H DOS 0.55 HL-11 DOS 0.59 CL-40 7.3%

41 36 1H RSS 1.55 HL-12 DOS 1.58 CL-40 1.9%

41 41 3H RSS 1.69 HL-11 DOS 1.48 CL-29 -12.4%

42 36 1H RSS 1.83 HL-1 1 DOS 11.91 1CL-40 14.4%

86-9055670-000 Page 48 of 113 Table 3-20: Re-tested DOSs that Failed the Probe Wear Check Worn Probe Good Probe SG Row Col Elev  % Diff Ind Volts Cal Ind Volts Cal 5 20 2H RSS 1.51 HL-3 DOS 1.6 HL-11 6.0%

5 20 4H DOS 0.57 HL-3 DOS 0.68 HL-11 19.3%

7 49 1H RSS 1.89 CL-24 DOS 1.7 CL-48 -10.1%

12 46 2H RSS 1.81 CL-25 DOS 1.78 CL-48 -1.7%

16 90 1H RSS 1.6 CL-10 DOS 1.7 CL-32 6.2%

20 89 3H RSS 1.62 CL-10 DOS 1.74 CL-48 7.4%

SG 1-2 21 82 1H RSS 3.43 CL-12 DOS 3.61 CL-32 5.2%

25 61 1H RSS 2.25 CL-1I DOS 2.36 CL-48 4.9%

26 27 1H RSS 1.95 HL-7 DOS 1.96 CL-26 0.5%

26 52 1H DOS 0.28 CL-7 DOS 0.35 CL-26 25.0%

26 52 2H RSS 2.06 CL-7 DOS 1.94 CL-26 -5.8%

30 30 1H RSS 1.69 HL-7 DOS 1.58 CL-26 -6.5%

35 55 1H RSS 1.73 CL-7 DOS 1.68 CL-26 -2.9%

7 75 2H RSS 1.54 CL-23 DOS 1.59 CL-39 3.2%

7 75 4H DOS 0.27 CL-23 DOS 0.24 CL-39 -11.1%

SG 1-3 10 10 2H RSS 1.54 CL-27 DOS 1.53 CL-38 -0.6%

19 90 1H RSS 1.8 CL-15 DOS 2.01 CL-39 11.7%

25 81 1H RSS 1.55 CL-15 DOS 1.36 CL-39 -12.3%

11 25 1H RSS 1.67 CL-20 DOS 1.55 CL-64 -7.2%

SG 1-4 11 25 1H RSS 1.59 CL-39 DOS 1.55 CL-64 -2.5%

25 60 1H RSS 1.53 CL-16 DOS 1.14 CL-32 25.5%

86-9055670-000 Page 49 of 113 Table 3-21: New 1R14 DOSs >=0.5 Volts In Tubes Inspected With a Worn Probe In 1R13 IT ARC Out SG Row Col Ind Elev Volts Cal New? ARCIOutRR14 6 67 DS 2H 1 I R13 36 67 DOS 2H 1 CL-13 New Yes Yes 16 34 DOS 2H 0.76 CL-28 New Yes Yes 6 67 DOS 1H 0.74 CL-24 New Yes Yes 21 64 DOS 2H 0.73 CL-16 New Yes 27 70 DOS 3H 0.73 CL-13 New Yes Yes 10 39 DOS 3H 0.71 CL-27 New Yes Yes 10 39 DOS 3H 0.71 CL-40 New Yes 31 28 DOS 1H 0.7 HL-10 New Yes Yes 18 11 DOS 3H 0.69 CL-20 New Yes Yes 6 7 DOS 4H 0.68 CL-26 New Yes 21 55 DOS 3H 0.67 CL-21 New Yes Yes 19 46 DOS 2H 0.64 CL-18 New Yes Yes 9 11 DOS 2H 0.6 CL-28 New Yes Yes 31 28 DOS 2H 0.6 HL-10 New Yes Yes 19 44 DOS 2H 0.58 CL-18 New Yes Yes 29 22 DOS 3H 0.52 HL-10 New Yes Yes 10 11 DOS 1H 0.51 CL-27 New Yes Yes 10 9 DOS 2H 0.51 CL-26 New Yes 24 31 DOS 2H 1.02 CL-16 New Yes Yes 6 20 DOS 1H 0.87 CL-22 New Yes 21 64 DOS 1H 0.82 CL-11 New Yes Yes 23 36 DOS 1H 0.77 CL-15 New Yes Yes 21 64 DOS 3H 0.76 CL-11 New Yes Yes 36 46 DOS 4H 0.74 HL-10 New Yes 35 64 DOS 4H 0.73 CL-10 New Yes Yes 22 36 DOS 1H 0.73 CL-16 New Yes Yes 25 62 DOS 1H 0.71 CL-I1 New Yes Yes 12 64 DOS 2H 0.68 CL-19 New Yes Yes 5 62 DOS 4H 0.66 HL-1 New Yes Yes 1-2 6 58 DOS 4H 0.63 CL-19 New Yes Yes 14 63 DOS 3H 0.62 CL-12 New Yes Yes 17 62 DOS 6H 0.59 CL-18 New Yes Yes 35 63 DOS 2H 0.56 CL-8 New Yes Yes 24 18 DOS 1H 0.56 CL-17 New Yes 25 82 DOS 1H 0.55 CL-l1 New Yes Yes 6 66 DOS 3H 0.53 CL-18 New Yes Yes 12 85 DOS 4H 0.52 CL-21 New Yes 20 21 DOS 5H 0.52 CL-17 New Yes 36 49 DOS 6H 0.51 HL-10 New Yes 13 74 DOS 3H 0.51 CL-18 New Yes Yes 8 63 DOS 2H 0.5 CL-19 New Yes Yes 18 27 DOS 1H 0.5 CL-16 New Yes Yes

86-9055670-000 Page 50 of 113 Table 3-21: New 1R14 DOSs >=0.5 Volts in Tubes Inspected With a Worn Probe in 1R13 Row nCol Elev Id Volts Cal New? ARC Out1R14 ARC Out SG Vot IIIR13 Out I 1-3 7 8 DOS 1H 0.51 CL-27 New Yes Yes 19 45 DOS 2H 0.85 CL-14 New Yes 1-4 18 47 DOS 1H 0.53 CL-15 New Yes 16 55 DOS 2H 0.51 CL-19 New Yes

86-9055670-000 Page 51 of 113 Table 3-22: Summary of New DOS Indications for Probe Wear Comparison I1R14 DO11s in New 1R14 New IR14 New IR14 New New 1R14 11DS 4

SG Active DOS (Not DOS In Tubes DOS In Tubes DOS >=I.5 Volts in Tubes Tubes Detected in Insp. w/ Worn Insp. w/ Good Volts Insp. w Worn (Total) 1R13) Probe in 1R13 Probe in 1R13 Probe in 1R13 SG 1-1 845 122 88 34 29 17 SG 1-2 591 94 49 45 44 24 SG 1-3 290 45 5 40 18 1 SG 1-4 210 37 11 26 14 3 Total 1936 298 153 145 105 45 Table 3-23: Summary of ARC In and Out Tube Inspections in 1R13

1. ARC # ARC In SG Out TubesTue Total # of Tubes (1R13) Inspections (IRI3)

SG 1-1 1761 1921 3682 SG 1-2 1605 2008 3613 SG 1-3 1311 2499 3810 SG 1-4 1117 2628 3745 Total 5794 1 9056 14850

86-9055670-000 Page 52 of 113 Table 3-24: NDE Uncertainty Distributions Analyst Uncertainty Acaulsition Uncertainty Percent Cumulative Percent Cumulative Variation Probability Variation Probability

-40.0% 0.00005 <-15.0% 0.00000

-38.0% 0.00011 -15.0% 0.01606

-36.0% 0.00024 -14.0% 0.02275

-34.0% 0.00048 -13.0% 0.03165

-32.0% 0.00095 -12.0% 0.04324

-30.0% 0.00179 -11.0% 0.05804

-28.0% 0.00328 -10.0% 0.07656

-26.0% 0.00580 -9.0% 0.09927

-24.0% 0.00990 -8.0% 0.12655

-22.0% 0.01634 -7.0% 0.15866

-20.0% 0.02608 -6.0% 0.19568

-18.0% 0.04027 -5.0% 0.23753

-16.0% 0.06016 -4.0% 0.28385

-14.0% 0.08704 -3.0% 0.33412

-12.0% 0.12200 -2.0% 0.38755

-10.0% 0.16581 -1.0% 0.44320

-8.0% 0.21867 0.0% 0.50000

-6.0% 0.28011 1.0% 0.55680

-4.0% 0.34888 2.0% 0.61245

-2.0% 0.42302 3.0% 0.66588 0.0% 0.50000 4.0% 0.71615 2.0% 0.57698 5.0% 0.76247 4.0% 0.65112 6.0% 0.80432 6.0% 0.71989 7.0% 0.84134 8.0% 0.78133 8.0% 0.87345 10.0% 0.83419 9.0% 0.90073 12.0% 0.87800 10.0% 0.92344 14.0% 0.91296 11.0% 0.94196 16.0% 0.93984 12.0% 0.95676 18.0% 0.95973 13.0% 0.96835 20.0% 0.97392 14.0% 0.97725 22.0% 0.98366 15.0% 0.98394 24.0% 0.99010 >15.0% 1.00000 26.0% 0.99420 28.0% 0.99672 Std Deviation = 7.0%

30.0% 0.99821 Mean = 0.0%

32.0% 0.99905 Cutoff = +/- 15.0%

34.0% 0.99952 36.0% 0.99976 38.0% 0.99989 40.0% 0.99995 Std Deviation = 10.3%

Mean = 0.0%

No Cutoff

86-9055670-000 Page 53 of 113 Table 3-25: 1R13 AONDB to DOS in 1R14 Indication Location 1R14 Bobbin 1R14 +PointTM 1R13 AONDB Results (viEFPY)

Change from 1R13 to 1R14 Cyveg1 Cycle 14 1R13 Inerd+onTM InerdVoltage voltAvg Postulated AONDB Delta Volts**

DOS DNT nd +PointTM BInfere d BoInferred Inferred to Inferred to Change SG Row Col Elev Ind Volts Volts Volts

• Ind Volts

• DOS Inferred (v/EFPY) Voltage **

6 67 1H DOS 0.74 0.59 SAI 0.19/0.22 0.874 SAI 0.14 0.542 0.14 0.24 0.043 0.680 -0.138 11 15 3H DOS 0.39 2.35 SAI 0.29 0.717 SAI 0.29 0.717 -0.24 0.00 0.043 0.330 0.387 21 31 2H DOS 0.24 0.44 SAI 0.1 0.496 SAI 0.13 0.530 -0.21 -0.02 0.043 0.180 0.350 SG 1-1 24 12 2H DOS 0.17 0.46 SAI 0.21 0.623 SAI 0.15 0.554 -0.28 0.05 0.043 0.110 0.443 26 41 2H DOS 0.66 1.35 SAI 0.13/0.20 0.810 SAI 0.12/0.18 0.785 -0.09 0.02 0.043 0.600 0.184 27 35 1H DOS 0.67 0.45 SAI 0.09/0.34 0.915 SAI 0.24 0.658 0.01 0.18 0.043 0.610 0.048 42 46 1H DOS 0.13 0.3 SAI 0.17 0.577 SAI 0.14 0.542 -0.30 0.03 0.043 0.070 0.472 1 56 2H DOS 0.3 0.29 SAI 0.22 0.635 SAI 0.21 0.623 -0.23 0.01 0.037 0.249 0.375 4 72 1H DOS 0.23 0.46 SAI 0.18 0.588 SAI 0.16 0.565 -0.24 0.02 0.037 0.179 0.387 7- 65 2H DOS 0.88 0.91 SAI 0.36 0.800 SAI 0.30 0.729 0.11 0.05 0.037 0.829 -0.100 SGI1-2 - - - - -

19 57 2H DOS 0.36 2.28 SAI 0.27/0.37 1.068 SAI 0.26/0.37 1.061 -0.50 0.01 0.037 0.309 0.752 22 62 1H DOS 0.58 0.9 SAI 0.35 0.788 SAI 0.34 0.776 -0.14 0.01 0.037 0.529 0.248 45 52 2H DOS 0.5 2.11 SAI 0.29 0.717 SAI 0.2 0.612 -0.08 0.08 0.037 0.449 0.163 7 9 2-HG13DOS 10.2 [1.07 SAl 0.E J 0.612 11SAl 0.16 [0.5651 -0.26 0.03 0.015 0.179 0.386 23 31 212H DOS 1 2.27 2.2 SAI 0.56 1.042 SAI 0.30 0.729 1.11 0.23 0.015 2.249 -1.520 10 13 3H DOS 0.29 3.45 SAI 0.12 0.519 SAI 0.14 0.542 -0.18 -0.02 0.028 0.251 0.291 15 29 1H DOS 1.03 2.41 SAI 0.48 0.945 SAI 0.47 0.933 0.07 0.01 0.028 0.991 -0.059 19 45 2H DOS 0.85 1.86 SAI 0.23 0.647 SAI 0.22 0.635 0.15 0.01 0.028 0.811 -0.176 21 51 1H DOS 0.47 3.29 SAI 0.27 0.694 SAI 0.24 0.658 -0.14 0.03 0.028 0.431 0.227 Averages -0.07 0.05 0.14 Notes:

• Inferred voltage based on new correlation using only DCPP Unit 1 data

.. "1R13 Postulated AONDB Voltage" equals "1R14 Bobbin Volts" minus "Cycle 14 Avg Voltage Change (v/EFPY)" multiplied by 1.39 EFPY "Delta Volts" equals "1R13 Inferred Bobbin Volts" minus "1R13 Postulated AONDB Voltage"

86-9055670-000 Page 54 of 113 Figure 3-1: 1R14 As-Found Voltage Distributions SGs 1-1 and 1-2 Voltage Distributions of As-Found DOSIAONDB Indications SG 1-1 and SG 1-2 160 MSG 1-1 140 OSG 1-2 120-100 -. .............

r 80 E

z 60 40- -

20 ________

0 6 6 -. -. - .- - .- -. -. . . O. Ni N C N N (0(

s N ( 0 CN (

Bobbin Volts Figure 3-2: IR14 As-Found Voltage Distributions SGs 1-3 and 1-4 Voltage Distributions of As-Found DOS/AONDB Indications SG 1-3 and SG 1-4 160 MSG 1-3 140-0 SG 1-4 120 -

C 100 -_-_---

80 .. . ... .

80 E

z-60 _ --- ---_

40 200 - -

O~ N

- N N C~

N

~U(

NN (R

N rl-N (0

N "'

0) (

m(

A Bobbin Volts

86-9055670-000 Page 55 of 113 Figure 3-3: 1R14 Repaired Voltage Distributions SGs 1-1 and 1-2 Repaired Tube Voltage Distributions SG 1-1 and SG 1-2 10 MSG 1-1 OSG 1-2 8

0 S6 14 z2 2

0 'ill ii I B Bobbin Volts B III Ai Ii Figure 3-4: 1R14 Repaired Voltage Distributions SGs 1-3 and 1-4 Repaired Tube Voltage Distributions SG 1-3 and SG 1-4 10 MSG 1-3 OSG 1-4 8

0 6

c E

4

.i

.l 2

0 00000a0 00 - -' - NN~NNNNNNC A Bobbin Volts

86-9055670-000 Page 56 of 113 Figure 3-5: 1R14 RTS Voltage Distributions for RPC Confirmed or Not Inspected SGs 1-1 and 1-2 RTS Voltage Distributions for RPC Confirmed or Not Inspected SG 1-1 and SG 1-2 180 140 120 I0 100 80 E

60 z

40 20 0

SC) C0 0 0 0 0 I

It - - 1 -~, - -0 Bobbin Volts

- -. 1 C1 A1 Figure 3-6: 1R14 RTS Voltage Distributions for RPC Confirmed or Not Inspected SGs 1-3 and 1-4 RTS Voltage Distributions for RPC Confirmed or Not Inspected SG 1-3 and SG 1-4 160 140 120 C

0 100 C

- 80 E 60 z

40 20 0

Bobbin Volts

86-9055670-000 Page 57 of 113 Figure 3-7: 1R14 RTS Voltage Distributions SGs 1-1 and 1-2 Voltage Distributions of All DOS/AONDB Indications Returned to Service SG 1-1 and SG 1-2 160 140 120 o 100

80 0

E60 z

40 20 0

Bobbin Volts Figure 3-8: 1R14 RTS Voltage Distributions SGs 1-3 and 1-4 Voltage Distributions of All DOS/AONDB Indications Returned to Service SG 1-3 and SG 1-4 160 140 120 o 100 Z

I=1° 80 E 6o z

40 20 0

Bobbin Volts

86-9055670-000 Page 58 of 113 Figure 3-9: 1R14 DOS and AONDB vs. TSP Elevation Distribution of Indications by TSP Location 600 i 500 -

0 400 300 -

E 200 z

Tube Support Plate

86-9055670-000 Page 59 of 113 Figure 3-10: Cycle 14 Growth Distributions SGs 1-1 and 1-2 Delta Volts per EFPY SG 1-1 and SG 1-2 500 400 0

300

_=

1200 E

z0 100 0

Delta Volts per EFPY Figure 3-11: Cycle 14 Growth Distributions SGs 1-3 and 1-4 Delta Volts per EFPY SG 1-3 and SG 1-4 500 MSG 1-3 OSG 1-4 400 +

300 +

E200+-

z 100 n

,pp, P Pý 5'ý PI Z qbbe N NN Nb ,

Delta Volts per EFPY

86-9055670-000 Page 60 of 113 Figure 3-12: Cycle 14 Independent Growth Curves - All SGs Cycle 14 Growth Comparison 1.0 0.8 0.6 0.

C.)

0.4 0.2 0.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 >2 Delta Volts per EFPY Figure 3-13: Historical Change in Growth and BOC Voltage - All SGs Change in Average Growth DCPP-1 AIISGs 0.35 0.7 0.3 -- - 0.6 0.25 =---- 0.5 CL. 0

n. .

S0.2 0.4 0

2 0.15 0.3w 2.

0

• 0 0.1 0.2>

0.05 0.1 0 0 Cycle 9 Cycle 10 Cycle 11 Cycle 12 Cycle 13 Cycle 14

86-9055670-000 Page 61 of 113 Figure 3-14: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-1 Cycle 13 vs. Cycle 14 Growth Comparison SG 1-1 1.0 0.9 0.8 I 0.7 0.5

-4All SGs Cycle 13 0.3 0.4"+ -SG 1-1 Cycle 14 0.2 _

---

All SGs Cycle 14 0.1 0.0 Voltage Growth per EFPY Figure 3-15: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-2 Cycle 13 vs. Cycle 14 Growth Comparison SG 1-2 1.0 0.9 0.8 /

0.7 ---

0.6 a.0.5 0.4 --

- "+ SG 1-2 Cycle 13 0.3 -* 0.3All SGs Cycle 13

-SG 1-2 Cycle 14 0.2 -

• All SGS Cycle 14 0.1 0.0 Voltage Growth per EFPY

86-9055670-000 Page 62 of 113 Figure 3-16: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-3 Cycle 13 vs. Cycle 14 Growth Comparison SG 1-3 1.0 0.9 41 __ __ __ _ - _

0.8 I

0 .7 - - -- --- ---

0.6 0.5 0.4 - --.-- SG 1-3 Cycle 13 0.3 I _;

-0.3- All SGs Cycle 13

- SG 1-3 Cycle 14 0.2 00-All SGs Cycle 14 0.1 _

0.0 Voltage Growth per EFPY Figure 3-17: Cycle 13 vs. Cycle 14 Growth Comparison for SG 1-4 Cycle 13 vs. Cycle 14 Growth Comparison SG 1-4 1.0  :

0.9 --

II 0.8 - //

I 0.7 -

0.6 - -

IL 0 0.5 - -

0.4- -+-SG 1-4 Cycle 13

-- All SGs Cycle 13 0.3

-e--SG 1-4 Cycle 14 0.2

---

All SGs Cycle 14 0.1 0.0 N1,

,oltage rowt per EF PY '

t ý. Z~*b 'ZZG z" Zq,

'V ' NV Voltage Growth per EFPY

86-9055670-000 Page 63 of 113 Figure 3-18: SG 1-1 Cycle 14 Growth vs. BOC Voltage Growth Rate vs. BOC Voltage DCPP-1 SG 1-1 2

1.5

?-

2 0.5 0

-0.5 0 0.5 1 1.5 2 BOC-14 Voltage Figure 3-19: SG 1-2 Cycle 14 Growth vs. BOC Voltage Growth Rate vs. BOC Voltage DCPP-1 SG 1-2 2.000 1.500 IL 1.000 0.500 0.000

-0.500 4-0,00 0.50 1.00 1.50 2.00 8OC-14 Voltage

86-9055670-000 Page 64 of 113 Figure 3-20: SG 1-3 Cycle 14 Growth vs. BOC Voltage Growth Rate vs. BOC Voltage DCPP-1 SG 1-3 1.5 0.5 o0.5 0

-0.5 0 1 1.5 2 BOC-14 Voltage Figure 3-21: SG 1-4 Cycle 14 Growth vs. BOC Voltage Growth Rate vs. BOC Voltage DCPP-1 SG 1-4 IL 0 0.5 1.5 2 BOC-14 Voltage

86-9055670-000 Page 65 of 113 Figure 3-22: Cycle 14 Growth vs. BOC Voltage for All Steam Generators Growth Rate vs. BOC Voltage DCPP-1 All SGs 2

1.5 e All SGs Linear Regression (Slope = 0.01)

{ . ................ ......

U-UJ 0~0 o . 5 _- . . . .......- -- . .. .. ...........

0 o

• 0 0 4 0 0

• 9 0 ' O D,

-0.5 0 0.5 1 1.5 2 BOC-14 Voltage

86-9055670-000 Page 66 of 113 Figure 3-23: SG 1-1 Cycle 14 VDG Breakpoint Analysis Results Trilinear Growth Determination for SG 1-1 Cycle 14 4.0 3.0 a.

LL w

2.0

"- 2.0 0

(0 t-o 1.0 0.0 0.0 0.5 1.0 1.5 2.0 BOC Volts A Data - Piece 1 - -Piece2 - Piece 3 Figure 3-24: SG 1-2 Cycle 14 VDG Breakpoint Analysis Results Bilinear Growth Determination for SG 1-2 Cycle 14 4.0 Regression Break Point = 0.80 Volts SG 1-2 Cycle 14 3.0 -Bound 1 = 0.80 V Min. Bin = 15 Act. Bin = 133 C- SSE = 5.926

'o 2.0 1.0 0 0

0 0, 0 0.0 ism 1 0.0 0.5 1.0 1.5 2.0 BOC Bobbin Amplitude (Volts)

I - Data - Piece 1 - -Piece 21

86-9055670-000 Page 67 of 113 Figure 3-25: Composite Cycle 14 VDG Breakpoint Analysis Results Bilinear Growth Determination for Unit 1 Cycle 14 4.0 3.0 a-(L U-LU o2.0 0

1.0 0.0 0.0 0.5 1.0 1.5 2.0 BOC Bobbin Amplitude (Volts) o Data - Piece 1 - -Piece2

86-9055670-000 Page 68 of 113 Figure 3-26: Cycle 14 VDG for SG 1-1 Voltage Dependent Growth Curves DCPP-1 SG 1-1 Cycle 14 1.00 0.80 0.60 U.

01.

U.

0.40 0.20 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY Figure 3-27: Cycle 14 VDG for SG 1-2 Voltage Dependent Growth Curves DCPP-1 SG 1-2 Cycle 14 1.00 0.80 0.60 U-0 0.40 0.20 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY

86-9055670-000 Page 69 of 113 Figure 3-28: Cycle 13 VDG for All SGs Voltage Dependent Growth Curves DCPP-1 All SGs Cycle 14 1.00 -

/!

0 .80 -_--_-_-----------_-

0.60_

IL 0.40 --------.........................

-- - <=0.8v 0.20 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY

86-9055670-000 Page 70 of 113 Figure 3-29: SG 1-1 Cycle 13 VDG Breakpoint Analysis Results Trilinear Growth Determination for SG 1-1 Cycle 13 4.0 3.0 2.

.-. , 2.0

,-c 2

1.0 0.0 0.0 0.5 1.0 1.5 2.0 BOC Volts I - Data - Piece 1 - -Piece2 - Piece3 1 Figure 3-30: SG 1-3 Cycle 13 VDG Breakpoint Analysis Results Bilinear Growth Determination for SG 1-3 Cycle 13 4.0 Regression Break Point = 0.60 Vols SG 1-3 Cycle 13 3.0 Bound 1 = 0.60 V Min. Bin = 15 Act. Bin = 102 LL SSE = 2.749 2.0 1.0 0

0 0 3 0 3 IM 30 ýf S E;LE0 1

~

1313j ~ ~ .PP, " a.U--W=ý= =7 0.0 0.0 0.5 1.0 1.5 2.0 BOC Bobbin Amplitude (Volts) o Data - Piece 1 - -Piece 2

86-9055670-000 Page 71 of 113 Figure 3-31: SG 1-4 Cycle 13 VDG Breakpoint Analysis Results Bilinear Growth Determination for SG 1-4 Cycle 13 4.0 3.0 a-L.

2.0 1.0 0.0 0.0 0.5 1.0 1.5 2.0 BOC Bobbin Amplitude (Volts) o Data -Piece 1- -Piece 2 Figure 3-32: Composite Cycle 13 VDG Breakpoint Analysis Results Trilinear Growth Determination for All SGs Cycle 13 4.0 All SGs Cycle 13 Bound 1 = 0.50 V Bound 2 = 0.99 V 3.0 Min. Bin = 15 -I + +

Act. Bin = 222 C- Std. Error = 0.097 LI.

Ln "0 2.0 1.0 ii* /AA*'

• • ~ A *'* A AL A

• A*AA A A '

0.0 0.0 0.5 1.0 1.5 2.0 BOC Volts I A Data -- Piece 1 - - Piece 2 - Piece33

86-9055670-000 Page 72 of 113 Figure 3-33: Cycle 13 VDG for SG 1-1 Voltage Dependent Growth Curves DCPP-1 SG 1-1 Cycle 13 1.00 0.80 0.60 0.

0.40 0.20 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY Figure 3-34: Cycle 13 VDG for SG 1-3 Voltage Dependent Growth Curves DCPP-1 SG 1-3 Cycle 13 1.00 0.80 0.60 IL u

0.40 0.20 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY

86-9055670-000 Page 73 of 113 Figure 3-35: Cycle 13 VDG for SG 1-4 Voltage Dependent Growth Curves DCPP-1 SG 1-4 Cycle 13 1.00 0.80 0.60 U

0.40 -. -------- ...

- -. - <=lv

-a-- >Iv 0.20 - - ------ --

0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY Figure 3-36: Cycle 13 VDG for All SGs Voltage Dependent Growth Curves DCPP-1 All SGs Cycle 13 1.00 0.80 0.60 aL-a1.

0.40

<=0.5v

--- 0.51-0.99v 0 .20 -- . .... -- -.

-.... . >0 .99v 0.00 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 Delta Volts per EFPY

86-9055670-000 Page 74 of 113 Figure 3-37: 1R14 Probe Wear Voltage Comparison Probe Wear Voltage Comparison 4

y = 0.9652x + 0.06 2

R = 0.9645 3

o C.

1E 2

.0 CO 0

0 I 3 4 Bobbin Volts (New Probe)

Figure 3-38: Bobbin Voltage Uncertainty Distributions NDE Uncertainty Distributions 1.0 0.9 0.8 0.7 ia 0.6 a.

0 0.5

.2 0.4 E

U 0.3 0.2 0.1 0.0

-40.0% -30.0% -20.0% -10.0% 0.0% 10.0% 20.0% 30.0% 40.0%

Percent Variation In Voltage

86-9055670-000 Page 75 of 113 Figure 3-39: Inferred Voltage I Measured Voltage Comparison Inferred Voltage vs. Measured Voltage 1R14 All SGs 5.00

• Axial Indications

- Linear (Axial Indications) 4.00 . .. . ..

6 3.00 .. . . .. . . .

3* Max AONDB 2 m0 Voltage = 1.40v **

2.00 A 0.00 0.00 1.00 2.00 3.00 4.00 5.00 Measured Bobbin Voltage

86-9055670-000 Page 76 of 113 Figure 3-40: +PointTM Indication to Bobbin Voltage Comparison for SG 1-1 SG 1-1 Plus point vs. Bobbin Volts 4.50

• Indications 4.00

- Equivalency Line 3.50 3.00

_a 02.50

• 2.00 1.50 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 Bobbin Volts Figure 3-41: +PointTM Indication to Bobbin Voltage Comparison for SG 1-2 SG 1-2 Plus point vs. Bobbin Volts 4.5_

4 Indications Equivalency Line 3.5 0 2.5- -

2 0 0.5 1.5 2 2.5 3 3.5 4 4.5 Bobbin Volts

86-9055670-000 Page 77 of 113 Figure 3-42: +PointTM Indication to Bobbin Voltage Comparison for SG 1-3 SG 1-3 Plus point vs. Bobbin Volts 4.5 4

3.5 3

a0 2.5

.5 a- 2 1.5 0.5 0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Bobbin Volts Figure 3-43: +PointTM Indication to Bobbin Voltage Comparison for SG 1-4 SG 1-4 Plus point vs. Bobbin Volts 4.5 4

3.5 3

0 2.5 2

1.5 0.5 0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Bobbin Volts

86-9055670-000 Page 78 of 113 4.0 Database Applied for Leak and Burst Correlations Per GL 95-05, the databases used to perform the tube integrity evaluations should be the latest NRC approved industry database. The updated leak and burst correlations in Reference 8 for the ODSCC database include the 2R1 1 and 1R12 tube pull results from Diablo Canyon, as well as other recent industry tube pulls.

4.1 ConditionalProbabilityof Burst For the case of the burst pressure versus voltage correlation, the Addendum 6 database contained in Reference 8, meets all GL 95-05 requirements and was used in the as-found EOC-14 calculations and the EOC-15 projections, as well as the benchmarking of the prior cycle operational assessment. The correlation parameters were taken from Reference 8 and are shown in Table 4-1.

Table 4-1: Burst Pressure vs. Bobbin Amplitude Correlation PB= ao + a, log(Volts)

Parameter Addendum 6 Intercept, a 0 7.4801 Slope, al -2.4002 2r 79.67%

Std. Dev., cError 0.8802 Mean Log(V) 0.3111 SS of Log(V) 51.6595 N (data pairs) 100 Structural Limit (2560 psi)(1) 7.51V Structural Limit (2405 psi)(1) 9.40V p Value for a1 (l) 5.60.10-36 Reference cf 68.78 ksi (3)

Notes: The number of significant figures reported simply corresponds to the output from the calculation code and does not represent true engineering significance.

(1) Values reported correspond to applying a safety factor of 1.4 on the differential pressure associated with a postulated SLB event.

(2) Numerical values are reported only to compare the calculated result to a criterion value of 0.05. For such small values the relative change is statistically meaningless.

(3) This is the flow stress value to which all data was normalized prior to performing the regression analysis.

86-9055670-000 Page 79 of 113 4.2 Probabilityof Leak and ConditionalLeak Rate Reference 8 presents the results of the regression analysis for the voltage-dependent leak rate correlation using the Addendum 6 leak rate database for 7/8" tubes. It should be noted that, for the 2405 psi delta pressure, the one-sided p-value for the slope parameter in the voltage dependent leak rate correlation is 0.5%, which meets the 5% threshold for an acceptable correlation specified in Generic Letter 95-05. AREVA computer simulations include the slope sampling method for the leak rate correlation that is presented in Reference 8.

The methodology used in the calculation of these parameters is consistent with NRC criteria in Reference 2. The probability of leak and leak rate correlation parameters used in the CM and OA were taken from Reference 8 and are shown in Tables 4-2 and 4-3.

Table 4-2: Probability of Leak Correlation 1

=

Pr(Leak) 1 + e-[b+b2Ilog(Volts)]

Parameter Addendum 6 Intercept, bi -5.0407 Slope, b 2 7.5434 V11 (1) 1.3311 V12 -1.7606 V22 2.7744 DoF (2) 118 Deviance 32.37 Pearson SD 0.611 MSE 0.279 Notes:

1) Parameters V11 are elements of the covariance matrix of the coefficients, bi of the regression equation.

2) Degrees of freedom.

86-9055670-000 Page 80of 113 Table 4-3: Leak Rate vs. Bobbin Amplitude Correlation (2405 psi)

Q = 1 0 [b3 +b4 log(Volts)]

Parameter Addendum 6 Intercept, b 3 -0.8039 Slope, b 4 1.2077 Index of Deter., r2 20.0%

Std. Error 0.7774 Mean of Log(Q) 0.5090 Std. Dev. of Log(Q) 22.6667 p Value for b 4 0.5%

Data Pairs, N 32 Mean of Log(V) 1.0871 SS of Log(V) 3.1116 Note: The number of significant figures reported simply corresponds to the output from the calculation code and does not represent true engineering significance.

86-9055670-000 Page 81 of 113 5.0 EOC-14 Condition Monitoring, Benchmarking of EOC-14 Conditions and Assessment of Potential Underpredictions This section provides the EOC-14 condition monitoring, the results of a benchmarking study that compares the projected EOC-14 conditions to the as-found conditions, and an assessment of potential underpredictions as committed to the NRC.

5.1 EOC-14 Condition MonitoringResults EOC-14 as found conditions were evaluated to ensure that CM burst and leakage requirements were not exceeded. The burst probabilities and leak rates are shown in Table 5-2 and at the bottom of Table 5-7. The requirements for burst probabilities are met for all of the SGs, and for the leak rate, the plant-specific value of 10.5 gpm for the faulted steam generator was not exceeded in any steam generator.

5.2 EOC-14 Benchmark Calculations EOC-14 projections using the composite DCPP POPCD through 8 inspections have been previously provided to the NRC in the 1R13 90 day report (Reference 7). The actual Cycle 14 operating interval (1.39 EFPY) was consistent with that used in the Reference 7 analyses. The Addendum 6 correlations are also consistent with that used in Reference 7. Therefore, the only change in these benchmark calculations is the use of the composite DCPP POPCD through 9 inspections (which includes results from 2R13 inspections).

Table 5-1 provides a summary of the inputs required and the corresponding section(s) or table(s) that provide these data. If the input was unchanged relative to the input used in the 1R13 90 day report projections, then "no change" is noted in the comment field. For example, the growth distributions used in the benchmark calculations were the same as used in the 1R13 90 day report, and followed the guidelines provided in References 19 and 25.

Table 5-1: Inputs for EOC-14 Benchmark Projections Input Description Section or Table Reference [ Comments BOC Voltage Distribution Tables 5-3 and 5-4 No change Repaired Voltage Distribution Tables 5-3 and 5-4 No change NDE Uncertainties Section 3.6 and Table 3-23 No change POD Table 6-8 Composite POPCD through 9 inspections Growth Table 5-5 and 5-6 No change Cycle Length Section 5.2 1.39 EFPY; No change Tube Integrity Correlations Tables 4-1 to 4-3 Addendum 6; No change Material Properties Section 7.1 No change

86-9055670-000 Page 82 of 113 Table 5-7 provides a comparison of the EOC-14 benchmarking projections to the as-found EOC-14 conditions. This table shows the voltage distributions as well as the POB and leak rate results. In all cases, the leak rate, POB, and the number of indications were over-predicted by wide margins. Therefore, the EOC-14 projections using DCPP POPCD correlation and the growth guidelines provided conservative results relative to the as-found conditions, and no adjustments to either of the methodologies are warranted.

5.3 Assessment of Potential Underpredictions DCPP Tech Specs require that, upon implementation of POPCD, if the EOC conditional MSLB burst probability, the projected MSLB leak rate, or the number of indications are underpredicted by the previous cycle operational assessment, the following guidelines must be applied to assess the need for methods adjustments:

" The assessment of the probable causes for the under predictions, proposed corrective actions, and any recommended changes to probability of detection or growth methodology indicated by potential methods assessments.

" An assessment of the potential need to revise the ARC analysis methods if: the burst probability is underpredicted by more than 0.001 (i.e., 10% of the reporting threshold) or an order of magnitude; or the leak rate is underpredicted by more than 0.5 gpm or an order of magnitude.

" An assessment of the potential need to increase the number of predicted low voltage indications at the BOC if the total number of as found indications in any SG are underestimated by greater than 15 percent or by greater than 150 indications. If future inspection results provide additional information that could alter these guidelines, PG&E would provide recommended changes to the guidelines and basis for the changes in the subsequent 90 day report.

As discussed above, EOC-14 benchmark projections were performed using the DCPP POPCD through 9 inspections. As shown in Table 5-7, the POBs, leak rates, and numbers of indications (also shown graphically in Figures 5-1 through 5-4) were overestimated in all cases for EOC-14. Therefore, there is no need to perform a method adjustment assessment.

86-9055670-000 Page 83of 113 Table 5-2: Summary of 95-05 ARC Calculations As-found vs.

Projected EOC-14 SG 1-1 SG 1-2 SG 1-3 SG 1-4 Number of As-Found 879 689 306 248 DOS Plus AONDB Projected (1) 1204 855 403 332 Leak Rate As-Found 0.34 0.19 0.10 0.06 (gpm) Projected (1) 1.80 0.58 0.41 0.26 As-Found 1.88 x 104 1.13 x 10-4 3.64 x 10 5 2.37 x 10-POB Projected (1) 2.53 x 10- 3 4.62 x 10-4 4.22 x 104 2.45 x 104 Acceptance Criteria 1.0 x 10- 2 10.5 gpm Noteýs: (1) Used actual cycle length of 1.39 EFPY and DCPP POPCD through 9 inspections.

(2) The 95% Upper Confidence Limit (UCL) is based on the number of trials with one or more failures.

(3) Equivalent volumetric rate at room temperature.

(4) The calculated total leak rate reflects the upper 95% quantile value at an upper 95% confidence bound.

(5) The reference leak limits (10.5 gpm) consider contributions from other ARCs. Therefore other ARC leak rates should be added to the results in this table to assess total leakage.

86-9055670-000 Page 84 of 113 Table 5-3: SG 1-1 BOC-14 Voltage Distribution Used for EOC-14 Benchmark Projections SG 1-1 Voltage Bin As-Found Repaired EOC-13 Rpie 0.1 0 0 0.2 23 1 0.3 79 1 0.4 128 0 0.5 116 1 0.6 85 4 0.7 86 7 0.8 41 2 0.9 47 1 0.99 30 0 1 4 0 1.1 42 0 1.2 19 1 1.3 16 0 1.4 11 0 1.5 23 0 1.6 2 0 1.7 5 0 1.8 7 0 1.9 4 0 2 2 1 2.1 7 7 2.2 1 1 2.3 3 3 2.4 1 1 2.5 1 1 2.6 1 1 2.7 0 0 2.8 0 0 2.9 0 0 3 0 0 Total 784 33

86-9055670-000 Page 85of 113 Table 5-4: SGs 1-2, 1-3, and 1-4 BOC-14 Voltage Distributions Used for EOC-14 Benchmark Projections SG 1-2 SG 1-3 SG 1-4 Voltage Bin As-Found As-Found As-Found EOC-13 Repaired EOC-13 Repaired EOC-13 Repaired 0.1 0 0 0 0 0 0 0.2 10 0 6 0 5 0 0.3 48 0 28 1 21 0 0.4 73 1 34 0 27 0 0.5 104 6 47 1 49 2 0.6 91 5 30 3 29 0 0.7 76 3 24 0 14 0 0.8 49 1 16 2 22 0 0.9 39 0 23 0 2 0 1 26 0 12 1 17 0 1.02 5 0 3 0 0 0 1.1 13 0 8 0 9 0 1.2 16 0 8 0 4 0 1.3 6 0 4 0 2 0 1.4 7 0 4 0 3 0 1.5 7 0 4 0 6 0 1.6 3 1 6 0 2 0 1.7 0 0 2 1 1 0 1.8 1 0 3 0 1 0 1.9 1 0 2 0 0 0 2 1 0 3 0 0 0 2.1 1 1 1 1 2 2 2.2 0 0 1 1 0 0 2.3 1 1 1 1 1 1 2.4 0 0 0 0 0 0 2.5 0 0 0 0 0 0 2.6 0 0 0 0 0 0 2.7 0 0 0 0 0 0 2.8 0 0 0 0 0 0 2.9 1 1 0 0 0 0 3 0 0 0 0 0 0 Total 579 20 270 12 217 5

86-9055670-000 Page 86 of 113 Table 5-5: Cycle 12 Growth Distributions for SG 1-1 (Used for EOC-14 Benchmark Projections for SG 1-1)

Growth in BOC Voltage VoltsIEFPY 0.5V to

<-0.5V 0.99V >0,99V 0 57 27 10 0.1 139 40 1 0.2 92 31 5 0.3 44 20 5 0.4 24 20 1 0.5 6 8 5 0.6 5 7 4 0.7 0 3 2 0.8 0 2 1 0.9 0 2 1 1 0 1 1 1.1 0 0 2 1.2 0 0 0 1.3 0 0 1 1.4 0 0 0 1.5 0 1 0 1.6 0 0 0 1.7 0 1 0 1.8 0 0 0 1.9 0 0 1 2 0 0 0 2.1 0 0 0 2.2 0 0 0 2.3 0 0 0 2.4 0 0 1 2.5 0 0 2 2.6 0 0 0 2.7 0 0 0 2.8 0 0 0 2.9 0 0 0 3 0 0 0 3.1 0 0 1 3.2 0 0 0 3.3 0 0 0 3.4 0 0 0 3.5 0 0 0 Total 1 367 163 I 44

86-9055670-000 Page 87 of 113 Table 5-6: Composite Cycle 12 Growth Distributions for All SGs (Used for EOC-14 Benchmark Projections for SGs 1-2, 1-3, and 1-4)

Growth in BOC Voltage Volts/EFPY 0.5V to >1.02V

<= 0.5V 1.02V >1.02V 0 133 99 29 0.1 340 132 18 0.2 163 84 26 0.3 60 39 10 0.4 32 31 5 0.5 10 11 7 0.6 5 9 8 0.7 0 4 3 0.8 0 2 2 0.9 0 2 1 1 0 2 2 1.1 0 0 3 1.2 0 1 1 1.3 0 0 2 1.4 0 0 0 1.5 0 1 0 1.6 0 0 1 1.7 0 1 0 1.8 0 0 0 1.9 0 0 1 2 0 0 0 2.1 0 0 0 2.2 0 0 0 2.3 0 0 0 2.4 0 0 1 2.5 0 0 2 2.6 0 0 0 2.7 0 0 0 2.8 0 0 0 2.9 0 0 0 3 0 0 0 3.1 0 0 1 3.2 0 0 0 3.3 0 0 0 3.4 0 0 0 3.5 0 0 0 Total 743 1 418 1 123

86-9055670-000 Page 88 of 113 Table 5-7: As-found EOC-14 vs. Projected EOC-14 Conditions Voltage SG 1-1 SG 1-2 SG 1-3 SG 1-4 Bin As-Found Projected As-Found Projected As-Found Projected As-Found Projected 0.1 0 0.88 1 0.44 0 0.27 0 0.22 0.2 21 18.58 16 9.99 8 5.94 7 4.86 0.3 100 57.64 50 35.25 28 20.30 28 16.17 0.4 145 103.57 72 69.58 49 37.95 27 30.29 0.5 120 142.40 78 99.79 45 49.91 33 41.76 0.6 115 153.60 102 118.03 43 54.28 46 48.34 0.7 73 135.08 121 108.15 21 45.70 27 41.68 0.8 70 108.83 80 89.75 20 35.78 19 32.03 0.9 39 85.81 58 72.81 25 28.55 17 24.44 1 45 68.82 36 57.97 12 23.31 10 19.11 1.1 29 56.21 27 45.63 18 19.00 8 15.24 1.2 19 45.43 13 34.83 6 14.96 7 11.82 1.3 26 35.80 10 25.75 3 11.51 5 9.06 1.4 21 28.66 3 19.20 9 9.04 5 7.04 1.5 19 23.03 7 14.34 3 7.22 2 5.50 1.6 6 18.35 5 10.59 6 5.81 3 4.35 1.7 6 15.37 4 7.83 2 4.79 2 3.47 1.8 10 13.74 2 6.06 2 4.13 1 2.85 1.9 7 12.34 0 4.93 3 3.65 0 2.37 2 3 10.66 2 4.08 0 3.19 1 1.94 2.1 1 8.80 0 3.18 2 2.67 0 1.51 2.2 1 7.11 0 2.48 0 2.21 0 1.19 2.3 1 5.76 0 1.96 1 1.82 0 0.96 2.4 0 4.78 1 1.49 0 1.46 0 0.75 2.5 1 4.22 0 1.18 0 1.20 0 0.61 2.6 0 3.94 0 1.08 0 1.04 0 0.54 2.7 0 3.70 0 1.06 0 0.92 0 0.49 2.8 0 3.23 0 0.95 0 0.79 0 0.43 2.9 0 2.95 0 0.91 0 0.70 0 0.41 3 0 2.63 0 0.83 0 0.61 0 0.36 3.5 0 5.56 0 1.90 0 1.71 0 0.93 4 0 2.66 1 0.63 0 0.64 0 0.32 4.5 1 3.46 0 0.49 0 0.40 0 0.26 5 0 5.73 0 0.92 0 0.65 0 0.45 5.5 0 2.97 0 0.37 0 0.40 0 0.22 6 0 1.64 0 0.25 0 0.22 0 0.13 6.5 0 0.33 0 0.03 0 0.07 0 0.02 7 0 0.03 0 0.00 0 0.01 0 0.00

>7 0 0.00 0 0.00 0 0.00 0 0.00 Total 879 1204.35 689 854.73 306 402.84 248 332.15

<=1 728 875.22 614 661.77 251 302.00 214 258.90

>1 151 329.12 75 192.96 55 100.84 34 73.25

>2 5 69.50 2 19.71 3 17.54 0 9.59

>5 0 4.97 0 0.66 0 0.70 0 0.37 POB 1.88E-04 2.53E-03 1.13E-04 4.62E-04 3.64E-05 4.22E-04 2.37E-05 2.45E-04 Leak Rate 0.34 1.8 0.19 0.58 0.1 0.41 0.06 0.26

86-9055670-000 Page 89 of 113 Figure 5-1: As-found SG 1-1 vs Projected Voltage Distributions (DCPP POPCD)

EOC-14 As-Found vs. Projected Voltage Distributions DCPP-1 SG 1-1 175 150 125 0

• 100 0

E z

50 25 0

Bobbin Volts Figure 5-2: As-found SG 1-2 vs Projected Voltage Distributions (DCPP POPCD)

EOC-14 As-Found vs. Projected Voltage Distributions DCPP-1 SG 1-2 175 IIAs-Found 150 _ Projected (DCPP POPCD) 125 0C 10 0 .. . . .... . . . .. .. .

C

.175 -_ _ _ _ _ _ _ _ _ _ _ _

E ZOi 50 25 0

Bobbin Volts

86-9055670-000 Page 90 of 113 Figure 5-3: As-found SG 1-3 vs Projected Voltage Distributions (DCPP POPCD)

EOC-14 As-Found vs. Projected Voltage Distributions DCPP-1 SG 1-3 175 150 125 0,

100 75 E

z1 50 25 0

Bobbin Volts Figure 5-4: As-found SG 1-4 vs Projected Voltage Distributions (DCPP POPCD)

EOC-14 As-Found vs. Projected Voltage Distributions DCPP-1 SG 1-4 175 IIAs-Found 150 -

13 Projected (DCPP POPCD) 125 1 0,

100 75 E

z2 50 25-0 0 0 O bn oN N Bobbin Volts

86-9055670-000 Page 91 of 113 6.0 Probability of Prior Cycle Detection The NRC approved use of the voltage-dependent POPCD at DCPP in Reference 20. This section provides the 1R13 POPCD results, which is based on the results of the 1R14 inspection. This section also provides the updated POPCD correlation that was used in the EOC-15 projections provided in Section 7, as well as NRC reporting requirements for continued application of POPCD.

6.1 Updated DCPPPOPCD Correlation The POPCD method, which is based on results from actual field inspections, reflects the DCPP detection results that approach 1.0 at bobbin voltages above 1.9 volts. The resulting larger POD above about two volts realistically lowers the detection uncertainty, thereby lowering the number of the larger undetected indications in the BOC voltage distribution.

The 2R13 90 day report (Reference 18) provided the DCPP-specific correlation through nine inspections. The data from Reference 18 has since been updated to include the 1R14 inspection results, referred to as the 1R13 POPCD data. Tables 6-1 and 6-2 provide the 1R13 POPCD and composite POPCD data, respectively. The composite POPCD includes results from ten inspections. Table 6-3 provides the POPCD tracking matrix with column letters that correspond to the columns in Tables 6-1 and 6-2. Table 6-4 provides the POPCD matrix table including data from only the just cbmpleted cycle segregated into voltage bins of <=1.00v, 1.01-2.00v, and >2.00v based on the beginning-of-cycle (BOC) voltage. Table 6-5 provides the POPCD matrix table for the just completed cycle regardless of the beginning-of-cycle voltage. Table 6-6 provides the composite multi-cycle POPCD matrix table segregated into the three voltage bins. Table 6-7 provides the composite multi-cycle POPCD matrix table regardless of the beginning-of-cycle voltage.

Table 6-8 provides the correlation parameters for the composite data set.

The largest "undetected" POPCD indication in 1R13 was 1.29v. SG 1-3 R9C58 4H had a 1.20 volt DOS reported in 1R14 that was not reported in 1R13. The location was not inspected with +PointTm in either inspection (BND w/o RPC to BDD w/o RPC in Table 6-1 Column E) and had a 1.29v DOS look-up in 1R13.

6.1.1 Assessment of POPCDChanges NRC requires an assessment of the POPCD method for potential changes over time, that is, the multi-cycle POPCD distribution applied for the last operational assessment must be compared with the POPCD distribution obtained for only the last operating cycle. Differences in the two POPCD distributions must be assessed relative to the potential for significant changes in detection capability. Figure 6-1 shows the POPCD curves for the just completed cycle as well as three prior composite POPCD curves (POPCD through 1R12, 2R12, and 1R13). The curve labeled "through 1R12 (eight inspections)" was used in the 1R13 90 day report operational assessment for EOC-14 projections. The curve labeled "through 2R12

86-9055670-000 Page 92 of 113 (nine inspections)" was used for the benchmarking calculations for EOC-14 projections provided in Section 5 of this document. The composite POPCD through 1R1 3 was used for the EOC-1 5 projections provided in Section 7 of this document.

The 1R13 POPCD correlation for the just completed cycle (based on the 1R14 inspection results) is significantly improved for voltages less than 1 volt compared to the previous composite POPCD distributions. For indications above about 1.5 volts, it appears that the 1R13 POPCD correlation gives a slightly lower POD than the composite POPCD through 1R12, which was the POPCD distribution used for the EOC-14 operational assessment. The POPCD voltage bins for the 1R13 POPCD (Table 6-1) and the 1R12 composite POPCD (Reference 7) were compared and the 1R13 POPCD was higher (or equal) in all bins except for the 0.01 to 0.10 volt bin and the 0.91 to 1.00 volt bin. The 1R13 POPCD in thee 0.01 to 0.10 volt bin was 0.00 and the 1R13 POPCD in the 0.91 to 1.00 volt bin was 0.878.

These values are slightly lower than the 1R12 composite POPCD values of 0.05 and 0.906 for the same bins, respectively. These differences are negligible and do not represent a change in detection capability. The regression curve for the 1R13 POPCD gives a slightly lower POD for indications above about 1.5 volts compared to the composite curves due to the lack of data in the upper voltage bins for the 1R13 POPCD evaluation. As shown in Table 6-1, there were no indications (detected or non-detected) above 3.00.volts in the 1R13 POPCD evaluation. In contrast, the composite POPCD through 1R12 contains a total of 74 indications above 3 volts (all of which were detected). This lack of data in the upper voltage ranges allows the slope of the 1R1 3 POPCD to decrease since there are no upper voltage detections to "pull" the curve upward. This reasoning for the "apparent" decrease in the POD in the upper bins is also supported by the fact that there were no "misses" above 1.30 volts. Finally, the use of a log-logistic curve fit to the data also contributes to this apparent decrease in the POD in the upper tail, because there is an inflection point where the curve will react differently on each side, depending on the data distribution used in the fit.

The POPCD voltage bins for the 1R13 POPCD and 1R13 composite POPCD were also compared and the 1R13 POPCD was higher (or equal) in all bins except for the 0.01 to 0.10 volt bin and the 0.91 to 1.00 volt bin, where the 1R13 composite POPCD values were 0.049 and 0.910, respectively. Again, these differences are negligible and use of the 1R13 composite POPCD for the EOC-15 operational assessment is justified. Application of composite POPCD distributions for operational assessments, as committed to the NRC, has continually resulted in conservative projections of tube integrity at subsequent cycles. This was verified by performing additional probability of burst and leak rate calculations for the limiting steam generator (SG 1-1) using the 1R13 POPCD curve. In both cases, the analysis using the composite POPCD was bounding over the cycle POPCD.

86-9055670-000 Page 93 of 113 6.1.2 Assessment of DisappearingFlaws NRC also requires an assessment of disappearing flaws. For RPC confirmed indications at EOCn that are RPC NDD at EOCn.+, an assessment is required for the cause of the "disappearing flaws" if the +PointTM voltage is greater than 0.5 volt. If there are a significant number of occurrences of these "disappearing flaws",

the cause must be evaluated independent of the +PointTM voltage. (Note: In support of this evaluation, an RPC inspection is required at EOCn.+ for RPC confirmed indications at EOCn (either bobbin detected or bobbin NDD) that are bobbin NDD at EOCn+1 . This inspection is necessary to ensure that all known ODSCC indications are included in the condition monitoring and operational assessments as well as properly categorized for the POPCD method evaluation.)

All 1R13 +PointTM indications were detected by +PointTM and/or bobbin during the 1R14 inspection. Therefore, there were no "disappearing flaws" and an assessment is not required.

6.2 Input to Industry POPCDDatabase Tables 6-10 and 6-11 provide the 1R13 and the composite POPCD results in the format of EPRI ODSCC Database Report Addendum 6, Table 7-2, for eventual inclusion in the next addendum of the database report. The EPRI format differs slightly from the DCPP format in that DCPP treats EOCn RPC NDD indications as no detection as requested by the NRC (listed in Column G of Table 6-1 and Table 6-2), whereas the EPRI table treats these as detection.

86-9055670-000 Page 94 of 113 Table 6-1: 1R13 POPCD Results column A B C I E2 F G H I I J K S1R13 POPCD Data Table Detection at EOCn No Detection at EOCn (New Indications)

J E0 Bobbin n Id. RPC Confirmed at EOC EOC Bobbin Ind. Not RPC O Inspected at EOC, 1 EOCF Bobbin Ind. Repaired at EOC E.O Bobbin RPC Confirmed New EOCCl Bobbin Not RPC Inspected Ind. Found Only by RPC at EOCC or at EOC, & Plugged at EOC rm 1

EOCC, RPC NOD Bobbin 0

Indications '

Excluded from POPCD Totals for POPCD Evaluation BDD/ ROD - BDD / RDDTBDDw/o RPC --. DD wfo RPC ODDI RDD - Plugged at EOCn BNDwfoRPC -- BDD/ROD BNDwIoRPC -- BDDwIoRPC BNDwfoRPC - BND/RDD BDD/RNO - BDDw/oRPCI A1RNDATEOC-,

Voltage BDDI ROD - BNDIROD BDD/ RDD -BODDw/o RPC BDD wfoRPC -- Pluggedat EOCn 2ND/ROD -* 00 1/ROD BND/ROD - 2DD0w/o RPC BND/ROD -- BND/ROD BDDIRNO -* BDIRDD All BND wfo RPC Detection No POPCD for Bin BDD wto RPC BDOOI RDD BND/RND -2 BDD/RDD BND/RND - BDDw/oRPC 2ND/RHO -R . 2ND ROD BOOIRND ý BND/ROD at EOCn+I at EOCn Detection Voltage Bin BOOw/o RPC -- BND I RDD BND/ RDD "* Plugged at EOCn BDDIRND/Plugged at EOCn Note 41) at EOCn

.oo1-o10 0 0 0 0 0.000 0.11-020 7 0 0 2 0.562 0.21-0.30 22 65 0 5 8 166 77 0.683 0.31-0.40 28 62 0 3 7 0.779 0.41-0.50 41 41 10 6 6 0787 0.51-0r60 35 20 22 2 7 0.785 0.61-0.70 34 9 12 2 6 0.875 0.714-80 32 2 8 10 0 3 122 20 0.859 0.81-090 17 1 5 4 3 103 0.91-1.00 19 2 4 5 01 2 86 1 .01-1. 10 2 78 18 0 1 0 1.11-1. 20 8 0 0 0 47 1.21-1. 30 0 28 11 0.o66 6 0 0 0 0 0 1.31-1. 40 6 0 0 25 0 0 0 0 0 1.4 1-1.50 0 40 20 0 0 0 0 0 1.51-1.60 1.61-1.70 3

5 r 0 0

0 0

0 0

0 0

0 0

13 8

1.71-1.80 10 2 0 0 0 0 0 12 11 1.813- 6 1 0 0 0 0 0 7 5 0 0 0 6 0

2.01-2.10 0 11 0 0 0 0 0 0 1.000 2.11-2.20 0 0 0 0 0 2 1.000 0 6 2.21-2.30 0 0 0 0 0 0 1.000 2.31-2.40 0 0 1 0 0 0 0 1.000 2.41-2.50 0 0 11 0 0 0 00 0 1 1.000 2.51-2.60 0 0 0 0 0 1 0 1.000 2.61-2.70 0 0 0 0 0 0 0 2.71-2.80 0 0 01 0 0 0 0 0 2.81-2.90 0 0 0 0 0 0 2.91-100 00 0 00 0 0 0 0 3.01-3. 10 0 a0 0 0 0 0 0 0 3.11 - 0 0 0 0 3.21-: 0 0 0 0

-0 0 3.31-3.40 0 0 3.41-3.50 0 0 0 3.51-3.60 0 0 0 3.61-3.70 0 0 3.71-3.80 0 0 3.81-3. 90 0 0 0 0 0 0 0 0

3.91A4.00 I 0 ] 05 1649 0

Tota1 322_________ 1___________ 244 64 20 46 369 Notes:

1) POPCD for each voltage bin calculated as (Detection at EOCn)/(Detection at EOCn + No Detection at EOCn). By column, POPCD = (A+B+C)/(A+B+C+D+E+F+G).

2) EOCn RPC NDD bobbin indications are treated as new indications per NRC request

3) Includes indications at EOCn plugged at EOCn and new indications at EOCn+I, not reported in the bobbin inspection, and found only by RPC inspection of dents, mined residuals or other masons for the RPC inspection.

4) BOO = Bobbin detected indication; BND = Bobbin NDD intersection; ROD = RPC detected indication; RND = RPC NOD intemection

86-9055670-000 Page 95 of 113 Table 6-2: DCPP Composite POPCD Results (through 10 Inspections)

Column A B C 0 E F G H IJ K DCPP Specific POPCD Data Table Detection at EOC. No Detection at EOCn (New Indications)

EOC, Bobbin Ind. RPC EOC, Bobbin Ind. Not RPC EOCnBobbin Ind. Repaired at EOC. New EOCmt Bobbin RPC New EOC, Bobbin Not RPC Ind. Found Only by RPC at EOC,.1 EOC, RPC NODBobbin Excluded from Totals for POPCO t

Confirmed at EOt,. Inspected at EOC_,. Confinrned Inspected or at EOC, & Plugged at EOCý3 Indications P POPCD Evaluation BDDO /ROD - BOO IRDD BDDw/o RPC - BDDOw/RPC BOO/ RDD -- Plugged at EOCn BNDw/o RPC - BDD / ROD BNDwio RPC - BODwio RPC BNDwo RPC ' BND/ROD BOO/RNDO *BDD B o RPC AltRND AT EOC.

BDDORDD -*BND/RDD BOO/RODD -- BOOw/o RPC BDDw/o RPC --r PluggedattEOCn BNDOROD "- BOOIRDD BNDIRDD -- BOOw/o RPC BND/RDD - BND/RDD BDDIRND ý BDDIRDD AI BNDm/o RPC Detection No POPCD for BOOw/o RPC -- BDDOROD BND/RND -- BOOI RDD BNDIRND - BDDw/o RPC BNDIRND-t BND/RDD BDD/RND ý BND/RDD at EOCn+l at EOCn Detection Voltage Bin BDD0woRPC -- BND/ROD BND/ ROD- Plugged at EOCn BDO/RND/Plugged at EOCn Note )

at EOCn 0 1 13 63 129 772 125 1533 1110 0.565 0.51-0.60 225 906 50 58 705 503 402 37 8 9 21 1 558 77 1 0.879 291 3 1.01-1.10 107 217 1 9 7 169 4 102 0 65 2 0 0 2 152 4 1 0.974 62 0 0 0 0 19 22 1 0 0 0 0 8 0 0 0 0 3 0 0 0 1.81-1.90 I26 2 0 0 0 47 1 0.979 1.000 1.000 t.000 2.31-2.40 0 F 0 23 1 0 0 0 0 0 23 0 _0 00 7 0 0 0 0 10 0 0 0 0 6 0 1.000 2.81-2.90 0 1 0 13 1 0 2.91-3.00 a4nt-sto 3.11-3.20 0 0 0 2 1 0 1 1.000 3.21-3.30 0 3.31-3.40 0 3.41-3.50 0 3.51-3.60 0 3.61-3.70 0 0 2 1 0 0 3.71-3.80 0 2 0 39 1-.3 0 0 2 0 4.01-4.10 0 5 0 0 0 0 5 1 0 [ 1.000 4.11-4.20 0 3 0 0 0 0 3 0 1 0 1 0 0O 12.O0 1.

4114.30 0 0 0 0~ 0 4.31-4.40 0 4 0 0 0 4 0 1.000 4.41-4.50 0 2 0 0 0 4.51-4.60 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 3 O 1.000 L

0 5.61-5.70 1 0 ___0 - 1 0 3

6 O 0 0 0 1.000 21.41-21.50 0 0 1 0 Total 1940 7045 717 743 Notes:

1) POPCD for each voltage bin calculated as (Detection at EOCn)((Detection at EOCn + No Detection at EOCn). By column, POPCD = (A+B+C)/(A+B+C+D+E+F+G).

2) EOCn RPC NDDbobbin indications are treated as new indications per NRC request

3) Includes indications at EOCn plugged at EOCn and new indications at EOCn+1, not reported in the bobbin inspection, and found only by RPC inspection of dents, mixed residuals or other reasons for the RPC inspection.

AlRD = Robbhin detected indiruliorn2ND = Boubin NOD intersactinonRDD = RPC detected indication,2ND = RPC NODintersection

4) B= tected indication; BND= Bobbin NDDintersecfioný RDD = RPC detected indication; RND = RPC NDDintersection

86-9055670-000 Page 96 of 113 Table 6-3: POPCD Matrix Table for Tracking Indications Between EOCn and EOCn~+

BDD at EOCn+l BND at EOCn+1 EOCn BDD w/o RPC BDD w/RDD BDD w/RND BND w/o RPC BND w/RDD BND w/RND Not Not Not Not Not Not Plugged PPlugged ugged Plugged Plugged FPlugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged C - __-, . ..

BDD w/o RPC Not Plugged B B A A H H H H A A H H BDt D Plugged C .__: .. __.:

at_______Not Plugged B B A A H (2) H (2) H (1) H (1) A A H (2) H (2)

BOO wI/RND Plugged H,."_-'

Not Plugged G (3) G (3) G (3) G (3) H H H H G (3) G (3) H H Plugged '_"___ ______ __"_ '

BND w/o RPC Not Plugged E E D D H H No Count No Count F F No Count No Count BND BN w R DPlugged F,. .so1..

BND __ _ __ _ __ __ __ __

at EOCn Not Plugged E E D D H (2) H (2) H (1) H (1) F F H (2) H (2)

BN D w/RN D Plugged .... :_ _ " "_.... _

Ge No w General Notes:

Not Plugged I E j E D D j H - H No Count No Count F F No Count No Count The column letters correspond to the column letters in POPCD Tables 6-1 and 6-2.

BDD = Bobbin detected indication BND = Bobbin no detectable degradation (NDD) intersection RDD = RPC detected indication RND = RPC no detectable degradation intersection No Count = Intersections having no bobbin or RPC indication at either EOCn or EOCn+1 . These are not needed for POPCD.

Specific Notes:

1) For EOCn bobbin indications that are confirmed by RPC or detected only by RPC, EOCr+÷ RPC will be performed when bobbin is NDD and the number in this category will be "0" for future inspections.

2) If indications are RPC confirmed at EOCn but RPC NDD at EOCn+1 , and the +PointTM voltage is greater than 0.5 volts the causative factors for this change in RPC detection will be discussed in the ARC 90-day report. If there are a significant number of these occurrences of this category, independent of the +PointrM voltage, the cause will be evaluated in the 90-day report.

3) EOCn bobbin indications that were RPC NDD at EOCn, and at EOCn+1 are either RPC detected or bobbin detected without RPC inspection, are treated as undetected at EOCn in accordance with NRC request.

86-9055670-000 Page 97 of 113 Table 6-4: 1R13 POPCD Voltage-Specific Summary from 1R14 Inspection Results 1R13 POPCD Results POPCD Matrix for Indications <=1.00v at EOCn BDD at EOCn+1 BND at EOCn+1 EOCn BDD wIo RPC PlugedI BDDw/RDD Nott

[ BDD w/RND Not BND wIo RPC Not BNDw/RDD Not I

[

BND w/RNDP Not Plugged Plugged Plugged Plugged [Plugged Plugged Plugged Plugge Plugged Plugged Plugged Plugged Plugged 24 .... * .* '. ' ",

BDD BDD w/o RPC Not Plugged 11 1074 0 4 0 0 0 0 0 0 0 0 Plugged 11 _ .... * ._ _.- " .. ,*. . -_"

4 227 0 0 0 0 0 0 0 0 EOCn Not Plugged 0 7 1nBD w/ RND Plugged 1 Not Plugged 1 12 0 7 0 30 0 0 0 0 0 0 Plugged _*_.._" .... "____*__

2 17 No Count No Coun BND at BND w/o RPC Not Plugged BND w/ RDD Plugged 7 2 239 2

.°.

30 0 13 No Count No , Count Not Plugged 0 0 0 9 1 0 0 No Count No Count 0 35 No Count No Coun EOnBNO w/ RNO Plugged ____ ____ .____ ____ I__ ____ ____I___ ..

___ __ _ _ -__ L_...

EOn BNDw/RND Not Pluged _0 0 0 0 0 0 No Count No Count 1 1 No Count No Count POPCD Matrix for Indications >1.00v and <=2.00v at EOCn BDD at EOCn+1 BND at EOCn+1 EQOn EO_ BDDw/oRPC 1lNot PuggePPlugged I

I BDDW/RDD I Plugged Plugged Not BDDw/RND Plugged Not Plugged BNDw/oRPC Plugged Not Plugged J BNDw/RDD Plugged Not Plugged

[ BNDw/RND Plugged T Not Plugged Plugged 3 *. . -. .  :. .

BDD BDD w/o RPC Not Plugged 4 165 4 15 0 0 0 0 0 1 0 0 at BOO w/ ROD Plugged 1_ _.".

at Not Plugged 1 3 6 61 0 0 0 0 0 0 0 0 EOCn -B w/RND Plugged 0 .... " - ' .... ' " " " "° Not Plugged 0 0 0 0 0 2 0 0 0 0 0 0 Plugged _ * "._ _ , .____..

BND BND w/o RPC Not Plugged 1 2 0 0 0 0 No Count No Count 0 0 No Count No Count at BNO w/ RDD Plugged 0.... " !.. '. ..... _ . . . ," . ,

0 0 0 0 0 0 No Count No Count 0 1 No Count No Couni EOCn Not Plugged BNDw/ RNO Plugged ____ ___ ___ .___ __

EOn BNwRND Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Count POPCD Matrix for Indications >2.00v at EOCn BDD at EOCn+1 BND at EOCn+1 EOCn BDD w/o RPC I BDD w/RDD I BDD w/RND BND w/°IRPC I BNDw/RDD BND w/RND EfNot Not Not Not Not Not Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged 0 '_____. . ...""

BDD BDD w/o RPC Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0.-

.." ", "... . .I at B OD w/ RDD Plugged 23 Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0 EOCn w/RND Plugged 0 .... . . "". " ...

Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0 Plugged _ _ __ 1 _.. .. _*_..... *___

BND BND w/o RPC Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Count

" . I . .  ! . _. _ '

at B N D w/ R DD P lu g ge d 0" " . .. . I . " . .. ._.. _

0 0 0 0 0 0 No Count No Count 0 0 No Count No Count EOCn Not Plugged BNDw/RND Plugged . . .

Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Counl

= Letters in Table columns correspond to the column identifiers in Tables 2 and 3 where the indications are included in the numbers of indications for each voltage bin.

= If indications are RPC confirmed at EOCn but RPC NDD or not RPC inspected at at EOCn+1, the causative factors for this change in RPC detection should be discussed in the IRC 90 day report.

BDD = Bobbin detected indication BND = Bobbin NDD intersection RDD = RPC detected indication RND = RPC NND intersection No Count = Intersections having no bobbin or RPC indication at either EOCn or EOCn+1. Number of intersectionS not reported in data tables.

BDD + BND = Total Intersections POPCD = (bobbin detected at N)/[(bobbin detected at N) + (detected at N+1 but not bobbin detected at N)]

POPCD = (B+C+DIr(B+C+D*+(G+H+l+Jt1 r

POPCID = (B+C+D)/[(B+C+D)+(G+H+I+J)l

86-9055670-000 Page 98 of 113 Table 6-5: 1R13 POPCD Summary from 1R14 Inspection Results Regardless of Voltage POPCD Matrix for All Indications Regardless of Voltage BDD at EOCn+1 BND at EOCn+1 EOCn BDD w/o RPCN BDDw/RDD BDDw/RND BNDw/oRPC I BNDw/RDD I BNDw/RND rNot PlgggedgedPlugged iF]

Plugged PluggedPlugged Notj Plugged Plugged Not Plugged Plugged Not Plugged Plugged Not Plugge 3t d

Plugged 27 * - '  : ' . .....

BDD BDD w/o RPC Not Plugged 15 1239 4 19 1 35 10. 2..

at BDD w/ RDD Plugged 10 288 Not Plugged 1* 10 EOCn w/RND Plugged 1_,______."_"___-:

___ w/_____ Not Plugged 1 12 7 32 Plugged ____._:.._____.

BND BND w/o RPC Not Plugged 3 241 2 30 13 No Count No Count 2 17 No Count No Count

" 'N t n3 oo at BND w/ RDD Plugged 7"9 Not Plugged 9 No Count No Count 36 No Count_ No Count EOCn BND w/ RND Plugged _._

Not PluEqed No Count No Count 1 1 No Count No Coun!

86-9055670-000 Page 99 of 113 Table 6-6: DCPP Composite Voltage-Specific POPCD Summary Composite of 1R9, IR10, IRll, 1R12, 1R13, 2R8, 2R9, 2R10, 2R11 & 2R12 POPCD Evaluations POPCD Matrix for Indications <=1.00v at EOCn BDD at EOCn+1 BND at EOCn+I BNDw/oRPC INot BNDw/RDD BNDw/RND EOCn BDDwtoRPC I Not BDDwIRDD Not BDDw/RND Not Not Not_

Plugged Plugged Pugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plu gged B:DDWoRPC Plugged 134 .lugged u ' ___ __....

BDD Not Plugged 106 5759 146 225 2 73 1 67 0 8 0 0 at BDD w/RDD Plugged 164 . ... .. " . .*-

Not Plugged 2 530 41 982 0 2 0 0 0 26 0 2 P lu g g e d 5 * .. * . . .. _. .. ., , . . * . ..

Not Plugged 6 187 10 69 0 192 0 40 0 3 0 3 Plugged . * '. "_ .. ,__*. . . . -. . "

BND BN /R Not Plugged 63 3625 117 553 4 172 No Count No Count 50 234 No Count No Count at BNO w/ RDD Plugged 54 1 ' _ 0__ _' _ unt'N"__ _

EOCn Not Plugged Notw/RND Plugged _

0 ....

3, .... 1 _. 43 4 ... 0 ... 0:

"0 No Count NoCount 10 234 No Count

.. No

.. Count NotPlugged 0i3 5 0 16 No Count No Count 20 26 No Count No Couni POPCD Matrix for Indications >1.00v and <=2.00v at EOCn BDD at EOCn+1 BND at EOCn+1 EOCn EOnI BDD w/o RPC Not BDD w/RDD PINot I BDD wI/RND INot _ BND_TNot w/o RPC (INot BND W/RDD 1 BND w/RND Plugged'Plugged P

Not Plugged Plugged Plugged Plugged Pugged Plugged Plugged Plugged Plugged Plugged BDD w/o RPC Plugged 17 . . ....... ..

BDD - Not Plugged 10 538 193 73 0 4 0 0 0 1 0 0 at BDO w/RDD Plugged Not Plugged 190 .P._..

• 3 97 68 176 0 0 0 0 0 1 0 0 EOCn B wR Plu ed 2 . ,

BDOw/RNDNotPlugged 0 4 0 2 0 7 0 0 0 0 0 0 BND w/o RPC Plugged BND Not Plugged 1 23 4 15 1 4 No Countl No Count 0 0 No Count No Count 0 * . . . . . ""

at BN D w / R D D P lu g g e d Not Plugged 0 0 1 1 0 0 No Count No Count 0 1 No Count No Count EOCnPlge EO n BND w/ RND Plugged __... _ *___*.-_._.__-"::,.:,.

_ _ _ _ _ _'__ _ _ _ _ _ _ _ "_* _ ___.

• _.... I_.__._".

Not PluEged 0 0 0 0 0 0 No Countl No Count 0 0 No Count No Couni POPCD Matrix for Indications >2.00v at EOCn BDD at EOCn+1 BND at EOCn+1 BNDw/RDD BND w/RND EOCn BDDw/oRPC Not BDDw/RDD Not BDDw/RND Not BNDw/o RPC Not Not Not Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged 0 _ ,, ....

BDD - Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0 at at BDD w/ RDD Plugged NotPlugged 212 .":. '* . '

0 0 0 0 0 0 0 0 0 0 0 0 EOC BDD w/RND Plugged 0 *"

Not Plugged 0 0 0 0 0 0 0 0 0 0 0 0 BND w/o RPC Plugged _ _", * " " ._"_"

BND - Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Coun Plugged 0 ... . .. .. . " __" :. _ ._ " "' _

0 0 0 0 0 No Count No Count 0 0 No Count No Coun EOCn w Not Plugged 0 3 ND w / RND P lu g g e d _ "_ "_'0 _ "_.... ": " " _ _ ' " ". ' " " "

BND Not Plugged 0 0 0 0 0 0 No Count No Count 0 0 No Count No Coun

= Letters in Table columns correspond to the column identifiers in Tables 2 and 3 where the indications are included in the numbers of indications for each voltage bin.

= If indications are RPC confirmed at EOCn but RPC NDD or not RPC inspected at at EOCn+1, the causative factors for this change in RPC detection should be discussed in the ARC 90 day report.

BDD = Bobbin detected indication BND = Bobbin NDD intersection RDD = RPC detected indication RND = RPC NND intersection No Count = Intersections having no bobbin or RPC indication at either EOCn or EOCn+1. Number of intersectionS not reported in data tables.

BDD + BND ý Total Intersections POPCD = (bobbin detected at N)/[(bobbin detected at N) + (detected at N+1 but not bobbin detected at N)]

POPCD = (B+C+Dt/[(B+C+D)+(G+H+I+J)l

86-9055670-000 Page 100 of 113 Table 6-7: DCPP Composite POPCD Summary Regardless of Voltage POPCD Matrix for All Indications Regardless of Voltage BDD at EOCn+I BND at EOCn+1 EOCn BDDw/oRPC I BDDw/RDD I BDDw/RND BNDw/oRPC ] BNDw/RDD BNDw/RND PuNot Not Not Not Not Not Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged Plugged 151 _ _ __. _

BDD Plugged BDD w/o RPC NotPlugged 116 6297 339 298 2 77 1 67 9 566 .. . ."

at BDD w/RDD Plugged 5 627 109 1158 2 27 2 EOCnBDDwRND Plugged 7 " * * ,

Not Plugged 6 191 10 71 199 40 3 3 Plugged BND BND w/o RPC Not Plugged 64 3648 121 568 5 _

176 No

__._.... Count No Count 50 234 No Count No Coun 54 "_._

at aBNDw/RDD Plugged No Count 10 235 No Count No Coun

__BNDwRDNot Plugged 3 2 44 EO C n BN D wND P lu ge d_*_. .

Not Plu.qged 1 3 5 6 No Count No Count 20 26 No Count No Coun

86-9055670-000 Page 101 of 113 Table 6-8: DCPP POPCD Log Logistic Parameters POPCD POPCD Updated POPCD Parameter Through 1R12 Through 2R12 Through 1R13 (8 Inspections) (9 Inspections) (10 Inspections)

Number of Data Points 10566 13053 15071 a.0 (intercept) 2.125 2.258 2.308 a.1 (slope) 4.634 4.466 4.371 Vii 0.00245 0.00203 0.00175 V12 0.00471 0.00383 0.00330 V 22 0.01146 0.00909 0.00786

86-9055670-000 Page 102 of 113 Table 6-9: New DCPP POPCD Correlation Comparison to Previous POPCD Correlations (Best Estimates)

Volts POPCD Through 1R12 POPCD Through 2R12 New POPCD Through (Eight Inspections) (Nine Inspections) 1R13 (Ten Inspections) 0.1 0.075 0.099 0.113 0.12 0.105 0.135 0.152 0.14 0.138 0.174 0.194 0.16 0.173 0.215 0.237 0.18 0.210 0.256 0.279 0.2 0.247 0.297 0.321 0.22 0.285 0.337 0.362 0.25 0.340 0.394 0.420 0.3 0.426 0.481 0.506 0.35 0.503 0.555 0.578 0.4 0.570 0.618 0.638 0.45 0.627 0.670 0.688 0.5 0.675 0.714 0.730 0.6 0.750 0.780 0.792 0.7 0.803 0.827 0.836 0.8 0.842 0.861 0.868 0.9 0.871 0.886 0.892 1 0.893 0.905 0.910 1.1 0.910 0.920 0.923 1.2 0.924 0.932 0.934 1.4 0.943 0.948 0.950 1.6 0.956 0.960 0.961 1.8 0.965 0.968 0.968 2 0.971 0.973 0.974 2.2 0.976 0.978 0.978 2.4 0.980 0.981 0.981 2.6 0.983 0.984 0.984 2.8 0.985 0.986 0.986 3 0.9871 0.9877 0.9878 3.5 0.9905 0.9909 0.9909 4 0.9927 0.9929 0.9929 4.5 0.9942 0.9944 0.9943 5 0.9953 0.9954 0.9953 6 0.9968 0.9968 0.9967 7 0.9976 0.9976 0.9975 8 0.9982 0.9982 0.9981 9 0.9986 0.9985 0.9985 10 0.9988 0.9988 0.9987

86-9055670-000 Page 103 of 113 Table 6-10: 1R13 POPCD Results In Industry Format column A B C 0 I E F G H I J DCPP IR13 Input to Generic POPCD Data Table Detection at EOC, No Detection at EOCn (New Indications)

EOC, Bobbin Ind. RPC Confirmned at Enc_.

EOC. Bobbin Ind. Not RPC Inspected at EOC_*

I EG obnId.Rpie tEC New EOC_. Bobbin RPC Confirmed New EOCt. Bobbin Not RPC In'spetted Hod.Found Only by RPC at EOC*, or at EOC. & Plugged at EOC~x Excluded fro. POPCD Totals for POPCD Evaluation BDD/RDOD -BDD/RDD BDDw/o RPC -- BDDw/oRPC BODOROD - Plugged at EOCn BNDw/o RPC -D 0/ROD BNDw/o RPC -- BDDw/o RPC BND w/o RPC -BND/ROD All RND AT EOC-Voltage BDOI ROD -- ND I ROD BDD/ROD-. BOOwin RIP B Dwlo RPC -b Plugged at EOCn BNDIROD -- BODI ROD END/ROD - BOO w/o RPC BNDIRDD -- BND/RDD All BND w/n RPC at EOC-, Detection No POPCD for Bin BDD/RND -- BD0/RDD BDD/ RND -- BDD wio RPC I BND / RND "- 3DD / ROD END RND -

E BDD win RPC BND/RND --- BND/RDD BDD/RND/Plugged at EOCn atEOCn Detection Voltage Bin BDDIRND -- BND/ROD BND / ROD P-ugged at EOCn at EOCn (Note 1)

BOOw/oRPC -- BDD/ROD BDDw/o RPC -- BND/RDD 0.000 0 56>

0.704 1.41-1.50 0 C 0 40 0 1.000 1.51-1.50 1 1-1 70 1.71-1.80 IL I0

[____0 C 0

0 18 12 0

0 1.000 1.000 1.8 1-1.90 0 0 O T 0 1.000 2.01-2.10 0_ 0 O 6 0 1.000 2.01-2j.10J 01 0 0 C 0 11 0 1.000 0 0 0 0 0O_ 0 0~__

0 1 0 ________

___0_ L0 3.61-3.70 0

________ 0 0 0 _____

3.8,31180 3.91-4.00 j

0 0 0 0 C 00 0 0O_

0 Total Notes:

1 329 1 1278 1 62 1 41 244 f 64 46 1669 349

1) POPCD for each voltage bin calculated as (Detection at EOCn)/(Detection at EOCn - No Detection at EOCn). By column, POPCD = (A+B+C)/(A+B+C+D+E+F).

2) Plant specific POPCD to be based upon voltage bins of 0.10 volt. Industry POPCD database may use 0.20 volt bins due to difficulty of adjusting existing database to smaller bins.

3) Includet indications at EOCn plugged at EOCn and new indications at EOCn+I, not reported in the bobbin inspection, and found only by RPC inspection of dents, mixed residuals or other reasons for the RPC inspection.

4) EDD = Bobbin detected indication; BND = Bobbin NOD intersection; ROD = RPC detected indication; RND = RPC NOD intersection

86-9055670-000 Page 104 of 113 Table 6-11: DCPP Composite POPCD Results (10 Inspections) In Industry Format column A B C 0 I 6 F G H I J DCPP Total Input to Generic POPCD Data Table Detection at EOC, No Detection at EOCn (New Indications)

EOC. Bobbin Conirmd aEOWe Ind. RPC Confirmed at EOC, TEOC,Inpected Insetd.

Bobbin a id. 6CC,.

ot RPC Not at EOCý* INew Bobbi EC obnId ted Repire ee~

atC tEC Co Bobbin OCC, Confirmed eWiCn RPC New EOC,,a Nspete Bobbi Bobbin Inspected Not RPC EOC,Only I end.Found EOC. Plge atatEOC~n by RPCat

& Plugged EO,"

EOC,.d or at Eide xlddfo rm OCDEaCat OC Totals for POPCD Evaluation BDD I ROD / ROD BDDw/o RPC -* BDDw/o RPC BDD / ROD -* Plugged at EOCn BND w/o RPC - BDD / RDD BND wio RPC - BDD0w/o RPC BND w/o RPC -- BND /RDO All RNO AT FOC, BND / ROD All BND w/o RPC at 6C0%. No POPCD for Voltage BOO / ROD - BDD I RDD - BDD w/o RPC BDD w/o RPC - Plugged at EOCn BND/RDD -B B/ROD BN I RDD - BOD w/oRPC BND/ ROD 2ND/RD Detection Bin BODI/RND --*600/ IROD BDD /RND -- BDD w/o RPC BNDIRND - BDD/RDD BND / RND -b BDD w/oRPC BND RND -* BND / ROD BDDIRND/Plugged at EOCn at EOCn Detection Voltage Bin BDD/RND -- 2ND/IROD BND /ROD -- Plugged at EOCn at EOCn (Note 1) 80 w/o RPC -* BDD ROD BDD w/o RPC -. BND /ROD 6

58 276 _ _ _

7__ _ _ _ _ __

148 968 34 214 1333 52 1599 1114 0.589 248 1145 51 444 1204 645 377 1 0.691 0.762 227 927 50 201 966 176 1 0.B46 164 709 143 567 101 20 6 6 409 108 11 9 A 5 65 61 5 2 62 2 63 0 26 1 0 37 0 0 42 2 0 26 0 0 24 0 0 41 0 1.000 0 0 0 29 0 1.000 0 0 15 0 0 15 0 1.000 24 0 0 24 0 1.000 23 0 0 7 0 0 10 0 0~ 0 6 0 a-~ 0 8 0 02 0 13 0 0 02 3 0 8 a

.11-3.20- 0 00--r 2 0 0 1.000 0 1.000 0 1.000 0 0 0 1.00O 0 0 0 1.000 0 0 0 1.000 3.81-3.90 ________2 ____ 0 0 0 1.000 3914.00 0 _________ 0 0 0 4.01-4.10 5 _____ 0 0 0 1.000 4.11-4.20 0 0 3 0 0 0 1 000 4.21-4.30 0 0 0 0 1000 4.31-440 0 0 0 0 1.000 4.41-4.50 0 0 0 0 1 000 4.51-4.60 0 0 0 0 1.000 4.61-4.70 0 0 1 000 4.71-4.60 0 0 4.81-4.90 0 0 1.000 4.91-5.00 0 0 1.000 0 1.000 5.01-5.10 0 5.11-5.20 0 0 1 0 0 0 1.000 5.21-5.30 0 5.31-5.40 0 0 5.4 1-5.50 0 0 5.51-5.60 0 0 ____ __ _ _ _ 0 _ ___ _ _ _ 0 0 5.61-5.70 0 0 ____ __ _ _ _ 0 _ _ _ _ 0 5.7 1-5.60 0 0_ _ _ _ _ _ 0a_ __ _ 0 5.81-5.90 0 -0 _ __ _ _ 0 _______ 0__

5.>1-6.00 0

>6.00 0 Total 2024 1 7242 1 717 1 743 3716 I 629 I 587 1 9983 1 508 1 Notes:

1) POPCD for each voltage bin calculated as (Detection at EOCn)/(Oatetion at EOCn + No Detection at EOCn). By column. POPCD = (A+B+C)/(A+BvCvD+E+F).

2) Plant specific POPCD to be based upon voltage bins of 0.10 volt. Industry POPCD database may use 0.20 volt bins due to difficulty of adjusting existing database to smaller bins.

3) Includes indications at EOCn plugged at EOCn and new Indications at EOCn+1, not reported in the bobbin inspection, and found only by RPC inspection of dents, mixed residuals or other masons for the RPC inspection.

4) BDD = Bobbin detected indication; BND = Bobbin NDD intersection; RDD = RPC detected indication; RND = RPC NDD intersection

86-9055670-000 Page 105 of 113 Figure 6-1: 1R13 POPCD Comparison to Composite POPCDs DCPP POPCD Comparison 1.0

-Ki~L1;vv 0.9 +

0.8 0.7 //

C 0

• 0.6 o 0.5 2

0.4 I 0.3

- - - 1R13 POPCD (from 1R14 Results)

-- - Composite POPCD Through I R12 (Eight Inspections) 0.2 Composite POPCD Through 2R12 (Nine Inspections) 0.1 - Composite POPCD Through 1R1 3 (Ten Inspections) i F-0.0 0

6 EOCn Bobbin Volts

86-9055670-000 Page 106 of 113 7.0 EOC-15 Projections for Probability of Burst and Leak Rate This section provides the results of the EOC-15 POB and leak rate projections. AREVA uses Monte Carlo codes, as described in References 4 and 5, to provide the burst and leak rate analysis simulations. These evaluations are based on the methods in Reference 6 (for burst) and the slope sampling method for calculating the leak rate as defined in Section 9 of Reference

8. In addition, these evaluations use the POPCD and growth methodologies as described in Reference 16, as updated in References 19 and 25.

7.1 Inputs for Calculations Most of the inputs required for the POB and leak rate calculations have been described in other sections of this document. Table 7-1 provides a summary of the inputs required and the corresponding section(s) or table(s) that provide these data. The inputs that have not been previously discussed are provided in this section.

Table 7-1: Inputs for EOC-14 POB and Leak Rate Projections Input Description Section or Table Reference J Comments BOC Voltage Distribution Table 3-17 and 3-18 Repaired Voltage Distribution Table 3-17 and 3-18 NDE Uncertainties Section 3.6; Table 3-23 POD Table 6-8 Composite POPCD through 1R13 (10 inspections)

Growth Section 3.2; Tables 3-8 through 3-14 Cycle Length Section 7.1 1.63 EFPY Tube Integrity Correlations Tables 4-1 through 4-3 Addendum 6 Material Properties Section 7.1 Material Properties Since the burst pressure for a given flaw varies with the material properties of the tube, the material properties of the tubes must be included as an input into the POB program. This data is obtained from Reference 6. The values used for the EOC-14 projections were taken directly from Reference 6 and were a mean flow stress of 68.78 ksi and a standard deviation of the flow stress of 3.1725 ksi.

Cycle Length The estimated cycle length for Unit 1 Cycle 15 is 1.63 EFPY (Ref. 12). This value was used in all projections for EOC-15 conditions.

86-9055670-000 Page 107 of 113 7.2 ProjectedEOC-15 Voltage Distributions The EOC-15 voltage distributions are obtained by applying a Monte Carlo sampling process to the BOC-15 voltages. The process starts by selecting a random POPCD correlation based on the POPCD parameters through 1R13 shown in Table 6-8. Based on the POPCD correlation, the BOC-15 population of indications is determined (detected plus assumed undetected). The process then randomly assigns NDE uncertainty values and a growth value to each of the BOC-15 indications. The EOC-15 voltage distributions are then used to calculate a leak rate and probability of tube burst. Section 3.2 discusses the growth distributions that were used in the calculations. The only "delta volts adjustment" required was for Bin2 of the SG 1-2 growth distribution. Table 7-2 and Figures 7-1 through 7-4 provide the projected EOC-15 voltage distributions.

86-9055670-000 Page 108 of 113 Table 7-2: Projected EOC-15 Voltage Distributions from POB Calculations (DCPP POPCD)

EOC-15 Projected Distributions Voltage Bini SG 1-1 SG 1-2 SG 1-3 SG 1-4

<=0.1 1.57 11.47 0.46 0.56 0.2 35.3 31.96 9.72 12.21 0.3 93.83 61.09 23.16 27.59 0.4 157.24 86.78 42.22 40.54 0.5 194.15 105.39 55.6 49.43 0.6 180.8 116.65 58.84 47.63 0.7 141 119.63 54.64 44.88 0.8 107.54 113.26 44.39 38.32 0.9 85.7 96.1 34.04 29.02 1 66.74 73.88 26.38 20.98 1.1 51.5 53.74 20.5 15.06 1.2 41.47 38.8 15.62 11.12 1.3 34.35 27.8 11.91 8.54 1.4 28.88 19.47 9.32 6.71 1.5 23.97 13.34 7.78 5.33 1.6 19.38 9.17 6.64 4.2 1.7 15.28 6.51 5.66 3.25 1.8 12.12 4.81 4.74 2.45 1.9 9.76 3.62 3.83 1.78 2 7.49 2.63 2.95 1.27 2.1 5.44 1.83 2.2 0.9 2.2 3.74 1.22 1.59 0.63 2.3 2.44 0.81 1.13 0.43 2.4 1.51 0.61 0.79 0.29 2.5 0.91 0.57 0.55 0.2 2.6 0.54 0.49 0.38 0.14 2.7 0.32 0.35 0.26 0.09 2.8 0.18 0.23 0.17 0.06 2.9 0.1 0.14 0.11 0.04 3 0.06 0.09 0.07 0.03 3.1 0.03 0.06 0.04 0.02 3.2 0.01 0.05 0.02 0.01 3.3 0.01 0.03 0.01 0.01 3.4 0 0.03 0.01 0.01 3.5 0 0.07 0 0.01 3.6 0 0.21 0 0.03 3.7 0 0.3 0 0.05 3.8 0 0.27 0 0.05 3.9 0 0.19 0 0.04 4 0 0.13 0 0.03 4.1 0.01 0.08 0 0.02 4.2 0.04 0.06 0 0.02 4.3 0.1 0.04 0 0.01 4.4 0.18 0.03 0 0.01 4.5 0.24 0.02 0 0.01 4.6 0.25 0.02 0 0.01 4.7 0.22 0.01 0 0 4.8 0.17 0.01 0 0 4.9 0.12 0 0 0 5 0.07 0 0 0

>5 0.09 0 0 0 Totals jJ 1324.86 1004.08 445.73 374.04

86-9055670-000 Page 109 of 113 Figure 7-1: SG 1-1 EOC-15 Projected Voltage Distribution EOC-15 Projected Voltage Distribution for SG 1-1 200 180 160 140

. 120

. 100 0

ý 80 z

60

~1fkni.

40 20 0 ii

~

A~

'V

(,

f lmrnwm5 '~. 'b ~ '\

'bý 0. b bp* b. b "3 Bobbin Volts Figure 7-2: SG 1-2 EOC-15 Projected Voltage Distribution EOC-15 Projected Voltage Distribution for SG 1-2 200 180 140

.2 120 100 80 z

60 40-20J11fin -

0j - m b ~ 0 b ) "  %

Z 'V 'b NA NCI ' ,ý' 'Vb' b V '-, ,r b 'b" 'b b' NN tb~ NP NA N. '

Ip Bobbin Volts

86-9055670-000 Page 110 of 113 Figure 7-3: SG 1-3 EOC-15 Projected Voltage Distribution EOC-15 Projected Voltage Distribution for SG 1-3 200 180 160 140 C

2 120

. 100 8E 0

z 60 40 2: Ii m . .

Bobbin Volts Figure 7-4: SG 1-4 EOC-15 Projected Voltage Distribution EOC-15 Projected Voltage Distribution for SG 1-4 200 180 1eo 160 1411 2 120 0

100 E

80 z

60 40 20 tA

v. .,. .. . . .. .

m . , , . . . . . .. . . . . . . . . . . . . . . . . .

Bob bi t 'V 'b 'b 'b" 'b NN t b t' Bobbin Volts

86-9055670-000 Page 111 of 113 7.3 ProjectedTube Burst Probabilityand Leak Rate for EOC-15 Calculations to predict SLB leak rate and tube burst probability for each steam generator in DCPP Unit 1 at the projected EOC-15 conditions were performed using the burst pressure, leak rate, and probability of leakage correlations provided in Tables 4-1 through 4-3. The results of these calculations are shown in Table 7-3. As shown in Table 7-3, all of the results for projected EOC-15 conditions are below the acceptance criteria of 1.0 x 10-2 for POB and 10.5 gpm for leakage.

Table 7-3: Projected Leak Rate and Burst Probability at EOC-15 Using DCPP POPCD Probability of Burst SLB Leak Steam Projected _______ ______ Rate Generator Number of 95% UCL Indications Best Estimate (1 or More (gpm)

Failures)

-4 -4 SG 1-1 1324.86 3.04 x 10 3.48 x 10 0.68

-4 -4 SG 1-2 1004.08 1.44 x 10 1.75 x 10 0.38

-4 -4 SG 1-3 445.73 1.10 x 10 1.38 x 10 0.20

-5 -4 SG 1-4 374.04 8.00 x 10 1.04 x 10 0.16 Reporting Threshold 1.0 x 10 -2 10.5

86-9055670-000 Page 112 of 113 8.0 References

1. AREVA Document 86-9050290-000, "DCPP Unit 1R14 Voltage-Based ARC and W-star ARC Startup Report", May 2007.

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

3. NRC SER for Diablo Canyon Units 1 and 2 for Voltage-Based Repair Criteria, letter to PG&E dated March 12, 1998.

4. AREVA Document 51-5001160-02, "Steam Generator POB Simulation Code -

POB97vb_R20.F90", December 2003.

5. AREVA Document 51-5001151-02, "Steam Generator Leak Rate Simulation Code LKR97VB2_r30.F90", December 2003.

6. WCAP 14277, Revision 1, SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections, December 1996.

7. AREVA Document 86-9011354-000, "DCPP 1R13 Bobbin Voltage ARC 90-Day Summary Report", February 2006.

8. EPRI Report NP 7480-L, Addendum 6, 2004 Database Update, "Steam Generator Tubing Outside Diameter Stress Corrosion Cracking at Tube Support Plates Database for Alternate Repair Limits", Electric Power Research Institute, January 2005.

9. Pacific Gas and Electric, Diablo Canyon Unit 1 Refueling Outage 1R14, "Steam Generator Degradation Assessment", Revision 1, May 9, 2007.

10. PG&E Letter DCL-06-080, "PG&E Response to NRC Request for Additional Information Regarding, "Special Report 06 Results of Steam Generator (SG) Tube Inspections for Diablo Canyon Power Plant Unit 1 Thirteenth Refueling Outage"", June 23, 2006.

11. Pacific Gas and Electric NDE Procedure, NDE ET-7, "Eddy Current Examination of SG Tubing",

Revision 10, May 1, 2007.

12. Pacific Gas and Electric Company, Diablo Canyon Power Plant, Surveillance Test Procedure, STP M-SGTI, Revision 14, "Steam Generator Tube Inspection", May 7, 2007.

13. AREVA Document 51-9050289-000, "Bobbin Coil Probe Wear Monitoring for DCPP 1R14", May 2007.

14. AREVA Document 86-5029429-00, "DCPP 2R1 1 Bobbin Voltage ARC 90 Day Summary Report",

June 2003.

15. NRC Letter to NEI, dated February 9, 1996, "Probe Wear Criteria."

86-9055670-000 Page 113 of 113

16. PG&E Letter DCL-04-028, License Amendment Request 04-01, "Revised Steam Generator Voltage-based Repair Criteria Probability of Detection Method for DCPP Units 1 and 2", March 18, 2004.

17. AREVA Document 51-5039454-001, "Bobbin/+PointTM Correlation for AONDB Indications at DCPP", June 2006.

18. AREVA Document 86-9024635-000, "DCPP Unit 2 R13 Voltage-Based ARC 90-Day Report", July 2006.

19. PG&E Letter DCL-04-117, "Response to August 24, 2004, NRC Request for Additional Information Regarding License Amendment Request 04-01", September 17, 2004.

20. NRC Letter to PG&E, "Diablo Canyon Power Plant, Unit Nos. 1 and 2 - Issuance of Amendment Re: Permanently Revised Steam Generator Voltage-Based Repair Criteria Probability of Detection Method (TAC Nos. MC2313 and MC2314)", October 28, 2004.

21. Not used.

22. Not used.

23. AREVA Document 32-9055671-000, "DCPP Unit 1 R14 Voltage-Based ARC 90-Day Report Calculations".

24. NEI Letter to NRC, "Generic Letter 95-05 Alternate Repair Criteria Methodology Updates", June 2, 2004.

25. PG&E Letter DCL-04-104, "Response to NRC Request for Additional Information Regarding License Amendment Request 04-01", August 18, 2004.