ML23219A059

Steam Generator Inspection Reports - Spring 2023 Spring Refueling Outrage

ML23219A059
Person / Time
Site:	Beaver Valley
Issue date:	08/07/2023
From:	Blair B Energy Harbor Nuclear Corp
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
L-23-168 SG-CDMP-23-10, Rev. 1
Download: ML23219A059 (1)

Text

Enclosure A L-23-168 Beaver Valley Unit 2 Refueling Outage 23 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report, Revision 1 (60 pages follow)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 SG-CDMP-23-10 July 2023 Revision 1 Beaver Valley Unit 2 Refueling Outage 23 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 iii RECORD OF REVISIONS Revision Date Description 0 July 2023 Original Issue 1 See PRIME Revised to address editorial error in Section 6.1.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 iv TABLE OF CONTENTS RECORD OF REVISIONS ........................................................................................................... iii TABLE OF CONTENTS............................................................................................................... iv LIST OF TABLES ...........................................................................................................................v LIST OF FIGURES .........................................................................................................................v 1 INTRODUCTION ............................................................................................................ 1-1 2

SUMMARY

AND CONCLUSIONS ................................................................................ 2-1 3 2R23 INSPECTION RESULTS AND VOLTAGE GROWTH RATES............................. 3-1 3.1 2R23 Inspection Results ............................................................................................. 3-1 3.2 Voltage Growth Rates ................................................................................................. 3-3 3.3 Probe Wear Criteria..................................................................................................... 3-4 3.4 NDE Uncertainties ...................................................................................................... 3-4 4 DATABASE APPLIED FOR LEAK AND BURST CORRELATIONS ........................... 4-1 4.1 Tube Material Properties ............................................................................................ 4-1 4.2 Burst Correlation ......................................................................................................... 4-1 4.3 Leak Rate Correlation ................................................................................................. 4-1 4.4 Probability of Leak Correlation.................................................................................. 4-1 4.5 NDE Uncertainties ...................................................................................................... 4-1 4.6 Upper Voltage Repair Limit ....................................................................................... 4-1 5 SLB ANALYSIS METHODS........................................................................................... 5-1 6 BOBBIN VOLTAGE DISTRIBUTIONS ......................................................................... 6-1 6.1 Calculation of Voltage Distributions .......................................................................... 6-1 6.2 Probability of Detection.............................................................................................. 6-1 6.3 Limiting Growth Rate Distribution ............................................................................ 6-1 6.4 Cycle Operating Period .............................................................................................. 6-2 6.5 Projected EOC-24 Voltage Distribution..................................................................... 6-2 7 SLB LEAK RATE AND TUBE BURST PROBABILITY ANALYSES ........................... 7-1 7.1 2R23 Condition Monitoring Leak Rate and Tube Burst Probability........................ 7-1 7.2 Cycle 24 Operational Assessment Leak Rate and Tube Burst Probability .............. 7-1 8 REFERENCES ................................................................................................................. 8-1 APPENDIX A ............................................................................................................................. A-1 SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 v LIST OF TABLES Table 3-1: 2R23 DSIs Identified With 0.63-inch Probe ............................................................... 3-1 Table 3-2: 2R23 RPC Examinations due to Bobbin Calls ........................................................... 3-2 Table 3-3: 2R23 DSI Voltage Distribution for SG-A ................................................................... 3-5 Table 3-4: 2R23 DSI Voltage Distribution for SG-B ................................................................... 3-5 Table 3-5: 2R23 DSI Voltage Distribution for SG-C ................................................................... 3-6 Table 3-6: Indication Distribution as Function of Tube Support Plate ........................................ 3-7 Table 3-7: Voltage Growth Cumulative Distribution ................................................................... 3-8 Table 3-8: Growth Rate as a Function of BOC Voltage Range.................................................... 3-9 Table 3-9: Indications with the Largest Growth in Cycle 23 ....................................................... 3-9 Table 4-1: 7/8-Inch Tube Burst Pressure vs. Bobbin Amplitude Correlation .............................. 4-2 Table 4-2: Tube Leak Rate vs. Bobbin Amplitude Correlation Parameters ................................. 4-3 Table 4-3: 7/8-Inch Tube Probability of Leak Correlation Parameters........................................ 4-4 Table 6-1: Predicted Voltage Distribution at EOC-24 ................................................................. 6-3 Table 7-1: Condition Monitoring Leak and Burst Results for 2R23 ........................................... 7-2 Table 7-2: Operational Assessment Leak and Burst Results for EOC-23 (POD = 0.6)............... 7-2 Table A-1: SG-A 2R23 DSI Indications...................................................................................... A-1 Table A-2: SG-B 2R23 DSI Indications...................................................................................... A-8 Table A-3: SG-C 2R23 DSI Indications.................................................................................... A-18 LIST OF FIGURES Figure 3-1: Voltage Distribution in SG-A (Measured vs. Predicted) ......................................... 3-10 Figure 3-2: Voltage Distribution in SG-B (Measured vs. Predicted) ......................................... 3-10 Figure 3-3: Voltage Distribution in SG-C (Measured vs. Predicted) ......................................... 3-10 Figure 3-4: Number of Measured Bobbin DSI as a Function of TSP ........................................ 3-11 Figure 3-5: Voltage Growth / EFPY in SG-A during Cycles 21, 22, and 23 ............................. 3-11 Figure 3-6: Voltage Growth / EFPY in SG-B during Cycles 21, 22, and 23 ............................. 3-12 Figure 3-7: Voltage Growth / EFPY in SG-C during Cycles 21 and 22 .................................... 3-12 Figure 3-8: Voltage Growth / EFPY in SGs A, B, C and Overall Bounding Growth Curve ..... 3-13 Figure 3-9: Upper 5% of Growth/EFPY for SG-A .................................................................... 3-14 Figure 3-10: Upper 5% of Growth/EFPY for SG-B .................................................................. 3-14 Figure 3-11: Upper 5% of Growth/EFPY for SG-C .................................................................. 3-14 Figure 3-12: Cycle 22 Voltage Growth vs. BOC Voltage .......................................................... 3-15 Figure 6-1: SG-A Predicted Voltage Distribution at EOC-24 ...................................................... 6-4 Figure 6-2: SG-B Predicted Voltage Distribution at EOC-24 ...................................................... 6-4 Figure 6-3: SG-C Predicted Voltage Distribution at EOC-24 ...................................................... 6-4 SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 1-1 1 INTRODUCTION This report provides a summary of the Beaver Valley Unit 2 steam generator (SG) bobbin and +POINT'1 probe inspections at tube support plate (TSP) intersections from the Spring 2023, 2R23 outage, together with postulated Steam Line Break (SLB) leak rate and tube burst probability analyses. The 2R23 outage represents the seventh application of the Generic Letter (GL) 95-05 (Reference 1) voltage-based repair criteria, and implementation of its requirements, to the Beaver Valley Unit 2 Model 51M SGs. The criteria were implemented during the 2R16 outage. Information required by the GL 95-05 is provided in this report, including SLB leak rates and tube burst probabilities calculated using the end-of-cycle (EOC) conditions for the recently completed Cycle 23, representing a Condition Monitoring (CM) assessment of bobbin coil signal amplitudes for observed possible indications. In addition, a projection of EOC-23 bobbin coil voltage distributions, as well as the associated SG tube leak rates and burst probabilities through EOC-24 conditions, is provided.

The CM analysis at EOC-23 was carried out using the bobbin coil voltage distributions measured during the 2R23 outage before the tube recovery program was performed. These results show that the 2R23 CM leak rates and conditional burst probabilities for all three SGs are well within their respective allowable limits. A comparison with the projections made in the previous 90-Day Report at the 2R22 outage (Reference 2) shows that the predictions were conservative. These evaluations utilized the Westinghouse generic methodology that uses Monte Carlo analysis techniques (Reference 3).

The Operational Assessment (OA) analysis was performed to project leak rates and tube burst probabilities for postulated SLB conditions at the end of the upcoming cycle (EOC-24) based on the 2.0 volt repair criteria for 7/8-inch diameter tubes. These analyses utilized bobbin voltage distributions measured during the recent (2R23) inspection and a growth rate distribution bounding the last three inspections (2R21, 2R22, and 2R23).

Leak and burst analyses for the OA were performed using the Reference 4 default value primary-to-secondary pressure differential of 2,560 psi. The Cycle 24 OA predicts that SG-B will be the limiting SG for projected leakage. With a Cycle 24 period of operation estimated at 534 effective full power days (EFPD), the limiting EOC-24 maximum leak rate for SG-B is projected to be 0.224 gpm (room temperature), which is well below the allowable limit of 8.1 gpm for the faulted SG. The corresponding maximum tube burst probability for the limiting SG (SG-C) of 3.14 x 10-5 is well below the GL 95-05 limit of 1.0 x 10-2. Thus, the GL 95-05 requirements are predicted to be satisfied at the EOC-24.

Before the previous inspection (2R22), the allowable accident-induced primary-to-secondary SG tube leakage limit was increased from 2.1 gpm to 8.1 gpm at standard temperature and pressure (STP) (Reference 17 and Reference 18). In the previous 2R22 GL 95-05 90-day report (Reference 2), the analysis considered an additional 0.1 gpm for the maximum allowable operational leakage in the faulted SG, for a total faulted SG leakage limit of 8.2 gpm. The 2R23 analysis contained within this report will conservatively apply the limit of 8.1 gpm in the event operational leakage occurs.

1

+POINT is a trademark or registered trademark of Zetec, Inc. Other names may be trademarks of their respective owners.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-1 2

SUMMARY

AND CONCLUSIONS A total of 1,380 distorted support indications (DSI) plus 1 dent with indication (DNI) were detected during 2R23 in all three SGs combined. 9 DSIs were returned to service through the tube recovery program during 2R23, for a combined total of 1,390 reported during the Beaver Valley Unit 2R23 bobbin coil inspection. Per GL 95-05, only those DSI signals with a bobbin coil signal amplitude of 2.0 volts or greater are required to be inspected using a +POINT (or equivalent) probe. All DSI signals reported during 2R23 were less than 2.0 volts, so no indications were required to be tested with the +POINT probe. However, some indications were tested with the +POINT probe to confirm the minimal bobbin coil voltage growth condition. These indications were confirmed as axial outside diameter stress corrosion cracking (ODSCC) using the +POINT probe during the 2R16 inspection and have been inspected with a +POINT probe at each successive outage.

In addition, in response to a prior Nuclear Regulatory Commission (NRC) question, all DSIs greater than 1.0 volt were inspected with a +POINT probe. The maximum bobbin coil voltage indication in all three SGs was 1.60 volts on R7 18 at the 02H tube support plate in SG-A.

SLB leak rate and tube burst probability analyses were performed using the actual 2R23 bobbin voltage distributions (CM analysis) as well as the projected EOC-24 bobbin voltage distributions (OA). It is noted that the CM analysis used the voltage distribution before the completion of the tube recovery program and the OA analysis used the voltage distribution after the tube recovery program was completed. The SLB leak rates from the CM analysis show significant margins relative to the faulted SG allowable limit of 8.1 gpm (room temperature), Reference 17. The corresponding CM tube burst probability values are well below the allowable limit of 1.0 x 10-2.

At 2R23, the largest SLB leak rate in the CM analysis is calculated for SG-B, with a magnitude of 0.051 gpm, which is well below the allowable SLB leakage limit of 8.1 gpm in the faulted SG. All leak rate values quoted are equivalent volumetric rates at room temperature. The limiting conditional tube burst probability from the CM analysis, 1.44 10-5 calculated for SG-C, is well below the NRC reporting guideline of 1.0 x 10-2. Thus, the CM results are well within the allowable limit/reporting guideline.

SLB leak rate and tube burst probability projections at the EOC-24 conditions were performed using the latest alternate repair criteria (ARC) database available for 7/8-inch outside diameter (OD) tubing (Addendum 7 update), which is documented in Reference 4. Leak and burst analyses for the Cycle 24 OA were performed using the Reference 4 default primary-to-secondary pressure differential of 2,560 psi. SG-B is predicted to be the limiting SG for leakage and SG-C is predicted to be the limiting SG for probability of burst. For a projected Cycle 24 duration of 534 EFPD, the EOC-24 leak rate projected for SG-B using the GL 95-05 constant probability of detection (POD) of 0.6 is 0.224 gpm (at room temperature), which is less than the current limit of 8.1 gpm in the faulted SG. This leak rate projection utilized the leak rate calculation methodology of References 5 and 6. The limiting EOC-24 burst probability of 3.14 10-5 is calculated for SG-C and is well below the allowable limit of 1.0 x 10-2. Therefore, all acceptance criteria of Reference 1 will be satisfied throughout Cycle 24.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-1 3 2R23 INSPECTION RESULTS AND VOLTAGE GROWTH RATES 3.1 2R23 Inspection Results For outages prior to 2R16, the alternate repair criterion per GL 95-05 had been approved for Beaver Valley Unit 2 but was not implemented. Energy Harbor Nuclear (EHN) had not implemented the criterion due to the small number of bobbin indications at TSP intersections which were confirmed to contain axial outside diameter stress corrosion cracking (ODSCC) using a +POINT probe. The criterion was implemented at 2R16 due to an increase in the number of distorted support plate indications (DSIs) confirmed to contain axial ODSCC from +POINT probe examination. It should be noted, for 2R16 and prior outages, the bobbin probe analysis utilized the guidance and requirements of GL 95-05. Since the initial 2R16 (and prior outages) inspection plan did not assume that GL 95-05 would be implemented, all bobbin coil DSIs were inspected using a +POINT probe. Note that under GL 95-05, only DSI signals with a 400/100 mix (hereafter referred to simply as the mix channel) signal amplitude of greater than 2.0 volts are required to be inspected using a +POINT probe.

In accordance with the guidance provided by GL 95-05, the 2R23 inspection of the Beaver Valley Unit 2 SGs consisted of a 100% eddy current (EC) bobbin probe full length examination of the tube bundles in all three SGs. All hot and cold leg TSP intersections were inspected using 0.720-inch diameter bobbin probes, with the exception of those hot leg TSP intersections in Rows 3 and 4 which contain SG tube sleeves at the hot leg top-of-tubesheet (TTS). In these two rows, a 0.630-inch diameter wide groove bobbin probe was used for DSI detection. If a DSI was observed using the 0.630-inch wide grove bobbin probe and the DSI could not be re-examined with a qualified rotating coil technique, the tube was to be plugged or repaired per the Beaver Valley Unit 2 SG Examination Guidelines (Reference 13). During the 2R23 outage, the DSI indications that were observed with the 0.630-inch wide groove probe were characterized as either no defect found (NDF) or confirmed to be single axial indications (SAIs) or multiple axial indications (MAIs) with

+POINT probe voltages as shown in Table 3-1.

Table 3-1: 2R23 DSIs Identified With 0.63-inch Probe SG Row-Col-Location Characterization Bobbin Probe Voltage A R3C59 02H NDF 0.60 A R4C60 02H NDF 0.54 A R4C60 06H NDF 0.34 B R3C55 02H NDF 0.82 B R3C55 04H NDF 0.51 B R3C58 03H NDF 0.32 B R3C65 03H SAI 0.90 B R4C36 04H MAI 0.73 B R4C48 03H NDF 0.56 B R4C59 02H NDF 0.64 B R4C59 03H NDF 0.54 C R4C28 06H NDF 0.39 C R4C33 02H SAI 0.66 C R4C33 04H SAI 0.82 GL 95-05 states that smaller or larger diameter probes can be used to inspect tubes when it is impractical to utilize a nominal-size probe provided that the probes and procedures have been demonstrated to give an equivalent voltage response and detection capability when compared to the nominal (in this case 0.720-inch) probe. Probe equivalency testing between the nominal 0.720-inch probe and 0.640-inch wide-groove probe has been performed and it was demonstrated that the wide-groove probe met the equivalency requirements of Appendix H of the EPRI PWR Examination Guidelines (Reference 14). Due to thicker walled sleeves at Beaver Valley Unit 2, an electrically similar 0.630-inch wide-groove probe was used in place of the 0.640-inch probe. Reference 15 provides the evaluation for the equivalency basis of using the 0.630-inch wide-groove probe during 2R23.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-2 To assess depth growth, the 2R22 DSIs with +POINT probe confirmation were also inspected at 2R23, even though none were required to be inspected with a +POINT probe due to the low bobbin amplitudes.

This inspection showed little or no change in the +POINT probe signal character, thus implying little or no depth growth of the indication. The largest +POINT probe signal amplitude in the 300 kHz channel from the confirmed DSI indications (SAIs) was 0.60 volt (SG-C at R24C79 02H), which represents a depth of 69.4% through-wall (TW) using the sizing protocol of Electric Power Research Institute (EPRI)

Examination Technique Specification Sheet (ETSS) ETSS I28431. This particular indication was measured during 2R21 at 0.78 volt and during 2R22 at 0.59 volt. These voltages represent a 2R21 depth of 73.8% TW and a 2R22 depth of 69.2% TW per ETSS I28431. Long term trending of the Unit 2 DSI population has shown a limited growth potential. For Cycles 10 through 23, the mean DSI voltage growth has been essentially zero. Additionally, the +POINT probe amplitudes for DSI signals confirmed as axial ODSCC have been much less than 1.0 volt, suggesting that a shallow depth of penetration exists. This in turn suggests the DSI voltage growth will remain minimal and not move to extreme over the next operating cycle. Thus, it can be concluded that the character of DSI indications reported to date has been associated with a depth of penetration well below 100% TW.

In addition, the EOC-23 eddy current inspection plan included 100% +POINT probe inspection of all hot leg and cold leg dents 5 volts (as measured from the bobbin probe), since GL 95-05 alternate repair criterion (ARC) does not apply to these tube-to-TSP intersections. The 2R23 eddy current inspection plan also included 100% +POINT probe inspection of dents with indication (DNI) due to this being a primary water stress corrosion cracking (PWSCC) concern and 25% of support plate residuals (SPR) due to this being an ODSCC concern. The DNI call can be generated by manual analysis or by using a tertiary auto analysis. As can be seen in Table 3-2, 1,127 total DNI indications were tested using a rotating pancake coil (RPC) probe. Two tube locations were identified as a DNI by the bobbin probe and were confirmed as an SAI by the +POINT probe. The first location was in SG-C tube R16C45 at 06C, where a DSI voltage was imputed from a developed DSI/SAI voltage correlation. As a result, this location was included in the GL 95-05 CM and OA evaluation and was subsequently changed to a DSI in the 2R23 eddy current database.

The second location, in SG-C tube R5C94 at 02H, was reported as an Axial PWSCC indication. Therefore, this DNI indication was disregarded from the GL 95-05 evaluation and was removed from service.

SPRs are defined as bobbin coil signals which do not contain flaw-like components but have a signal amplitude of 1.5 volts and phase angles >55 degrees. Axial ODSCC indications were not reported in these populations based on the +POINT probe analysis.

The +POINT probe inspection program for dents, DNIs, and SPRs was extensive. Table 3-2 provides the number of +POINT probe examinations performed at TSP intersections because of these program requirements during 2R23.

Table 3-2: 2R23 RPC Examinations due to Bobbin Calls DNT DNI SPR SG

>5V Dents Total RPC Tested Total RPC Tested A 16 639 639 671 259 B 38 152 152 251 106 C 14 336 336 248 78 Total 68 1127 1127 1170 443 The requirements of the GL 95-05 methodology in Section 1.b of Reference 1 are all satisfied. Tube intersections with the flow distribution baffle are excluded from this GL 95-05 analysis. There are no other excluded tube support plate intersections (Reference 7). None of the indications included in this analysis were detected in dents >5.0 volts, as measured by bobbin. All SPR indications >2.0 volts were tested with the +POINT probe so that no ODSCC indications >1.0 volt would be missed or misread. No copper signal interference was detected.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-3 Table 3-3, Table 3-4, and Table 3-5 present the 2R23 bobbin voltage data for the TSP intersections in the three SGs with distorted support indications (DSIs). A total of 1,390 (including 1 DNI) DSI indications at TSP locations were detected in all three SGs combined, of which only 16 indications had amplitudes greater than 1.0 volt and one with amplitude greater than 1.5 volts. For the analyses, the DSI indications are binned in 0.1 volt intervals where the numeric value of the bin represents the upper range of the bin. Therefore, the 1.0 volt bin contains DSI voltages from 0.91 to 1.00 volt. No DSI voltage exceeded the GL 95-05 lower voltage repair limit of 2.0 volts. For 2R23, all DSIs with a voltage amplitude greater than or equal to 1.0 volt were automatically tested using the +POINT probe, which exceeds the requirement by GL 95-05 to test all DSIs with a voltage amplitude greater than or equal to 2.0 volts. Comparing the inspection results from 2R22 to 2R23, the following observations were made:

- There were 31 new DSI indications in 2R23:

o 8 in SG-A (2 from the tube recovery program) o 19 in SG-B (7 from the tube recovery program) o 4 in SG-C

- There were 7 new SAI indications confirmed by +POINT probe in 2R23:

o 3 SAI in SG-A o 2 SAI in SG-B o 2 SAI in SG-C

- There were 2 indications confirmed with HAI (Historical Axial Indication) by the +POINT probe on tubes that were deplugged in SG-B It is noted that the Fall 2021 inspection (2R22) was the first use of the HAI eddy current analysis code. The HAI code is representative of tubes that are deplugged in the tube recovery program and returned to service with 95-05. The tube recovery program requires inspection after deplugging for a baseline prior to sleeving and returning the tube back to service. The purpose of the HAI is to flag the original axial indication call that is historically contained in the eddy current database. Since 2R22 was the first outage where the tube recovery program was performed, only 2R22 and 2R23 have HAI calls within the eddy current database.

Table 3-3, Table 3-4 and Table 3-5 tabulate the number of field bobbin indications, the number of those indications that were +POINT inspected, the number of +POINT confirmed indications, and the number of indications removed from service. Several tubes were deplugged in the current inspection with the intent of returning the tubes to service after 2R23 provided the detected indications from the baseline inspection meet requirements associated with the alternate repair criteria. The distribution of 2R23 indications is also shown in Figure 3-1, Figure 3-2, and Figure 3-3 for SG-A, SG-B, and SG-C, respectively.

The distribution of 2R23 indications as a function of support plate location is summarized in Table 3-6 and shown in Figure 3-4. The data shows a strong predisposition of ODSCC to occur in the first few hot leg TSPs although the mechanism extended to higher TSPs. Only 45 indications were detected on the cold leg side; 4 of these indications exceeded 0.5 volt, one of which exceeded 0.75 volt and none exceeded 1 volt. This distribution is consistent with that observed at other plants and is commonly attributed to the temperature dependence of ODSCC.

Appendix A provides a listing of all DSIs reported at the Beaver Valley Unit 2 2R23 outage in the form of tables (Table A-1, Table A-2, and Table A-3), whether axial ODSCC was confirmed (SAI/HAI/MAI in Comment column), whether the indication was tested and no defect was found (NDF in Comment column),

and whether the tube containing the indication(s) was plugged or deplugged (Comment column).

3.2 Voltage Growth Rates For projection of leak rates and tube burst probabilities at EOC-24, voltage growth rates were developed from the 2R21, 2R22, and 2R23 inspection bobbin data. Growth is determined when the same indication can be identified in two successive inspections. Since there can be new indications in one outage, the number of indications for which a growth can be defined is less than the number of indications detected. Table 3-6 shows a distribution of growth as a function of TSP number. Table 3-7 shows the frequency and cumulative probability SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-4 distribution of growth as a function of voltage change in each Beaver Valley Unit 2 SG during Cycle 23 on a per effective full-power years (EFPY) basis. The difference in the total number of DSIs between these two tables is largely due to new DSIs.

The average bobbin coil voltage growth rates for each SG during Cycle 23 are given in Table 3-8. The average growth rates over the entire voltage range are negative indicating essentially no overall voltage growth. The Cycle 23 growth rates on an EFPY basis for each SG are shown in Figure 3-5, Figure 3-6, Figure 3-7 and Figure 3-8. The differences in cumulative growth observed from 2R21 to 2R23 vary in each SG for each inspection. All SGs are bounded by the growth observed during 2R21. In SG-A and SG-C, the growth observed in 2R23 is bounded by the 2R22 growth. However, in SG-B, the growth observed in 2R23 is mostly bounding of the 2R22, with the upper tail from the 99th percentile being very similar. The growth figures also include curves which bound the growth observed during Cycles 21 through 23 in SGs A, B and C, respectively, and the bounding growth curve was used in the OA. Figure 3-9, Figure 3-10 and Figure 3-11 provide a magnified view of the upper 5% tail of the growth curves for SG-A, SG-B and SG-C, respectively.

Table 3-9 lists the top 22 indications based on the Cycle 23 growth rate in descending order. The average growth rates over the entire voltage range for Cycle 23 are mostly negative (Table 3-6) indicating essentially no voltage growth, but Table 3-9 shows that in cases of positive growth rates, that Cycle 23 had only modest growth. The growth observed during Cycle 23 had no indications over 1.0 volt/Cycle, only one indication greater than 0.5 volt/Cycle, and all other observed growth was 0.38 volt/Cycle or less.

To determine if Beaver Valley Unit 2 growth rates exhibited a potential dependency on the beginning of cycle (BOC) voltage, the growth rate data for Cycle 23 was plotted against BOC voltage, and the resulting plot is shown in Figure 3-12. The Cycle 23 growth data does not show any tendency to increase with the BOC voltage; if at all, the growth seems to decrease with increasing BOC voltage. Therefore, growth can be assumed independent of voltage in the Monte Carlo analysis for the OA.

3.3 Probe Wear Criteria The probe wear criterion approved by the NRC (Reference 8) was applied during the 2R23 inspection. When a probe does not pass the 15% wear limit, this alternate criterion requires that only tubes with indications above 75% of the repair limit inspected since the last successful probe wear check be re-inspected with a good probe.

As the repair limit for Beaver Valley Unit 2 is 2.0 volts, all tubes containing indications for which the worn probe voltage is above 1.5 volts are to be inspected with a new probe.

One DSI indication in SG-A has a measured bobbin voltage that exceeded the 1.5 volts criteria during 2R23.

The location that this occurred is at R7C18 02H. It was confirmed with the lead analyst that the probe used to test this location satisfied the wear limit criteria of GL 95-05 during 2R23. This indication has been measured as over 1.5 volts during 2R21 and 2R22, where it was found the probe wear criteria was satisfied. Since all probe wear criterion was satisfied, no re-tests were required.

3.4 NDE Uncertainties The non-destructive examination (NDE) uncertainties applied for the Cycle 23 voltage distributions in the Monte Carlo analyses for leak rate and burst probabilities are the same as those in the NRC Generic Letter 95-05 (Reference 1). The probe wear uncertainty has a standard deviation of 7.0% about a mean of zero and has a cut-off at 15% based on implementation of the probe wear standard. If the random sample of probe wear selected during the Monte Carlo simulations exceeds 15%, sampling of the probe wear distribution is continued until a value less than 15% is picked. The analyst variability uncertainty has a standard deviation of 10.3%

about a mean of zero with no cut-off. These NDE uncertainty distributions are included in the Monte Carlo analyses for SLB leak rates and tube burst probabilities based on the 2R23 actual voltage distributions as well as for the EOC-24 projections.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-5 Table 3-3: 2R23 DSI Voltage Distribution for SG-A

+POINT Not

+POINT Probe Voltage Number of +POINT Returned to Probe Tested Plugged Bin Indications(1) Probe Service Confirmed But Not Tested Confirmed 0.1 40 1 0 39 0 40 0.2 116 8 0 108 0 116 0.3 103 6 0 97 0 103 0.4 71 1 1 69 0 71 0.5 40 4 0 36 0 40 0.6 15 0 2 13 0 15 0.7 9 4 0 5 0 9 0.8 5 0 0 5 0 5 0.9 4 0 0 4 0 4 1.0 2 0 0 2 0 2 1.1 1 0 1 0 0 1 1.2 1 0 1 0 0 1 1.3 2 2 0 0 0 2 1.4 1 1 0 0 0 1 1.5 0 0 0 0 0 0 1.6 1 0 1 0 0 1 Total 411 27 6 378 0 411 Average Voltage = 0.30 volts Note: (1) This count includes the DSIs that were returned to service through the tube recovery program at 2R23.

Table 3-4: 2R23 DSI Voltage Distribution for SG-B

+POINT Not

+POINT Probe Voltage Number of +POINT Returned to Probe Tested Plugged Bin Indications(1) Probe Service Confirmed But Not Tested Confirmed 0.1 39 0 0 39 0 39 0.2 138 4 1 133 1 137 0.3 124 6 3 115 0 124 0.4 84 4 2 78 0 84 0.5 73 6 2 65 0 73 0.6 40 6 3 31 0 40 0.7 17 3 1 13 0 17 0.8 6 1 1 4 0 6 0.9 14 6 2 6 0 14 1.0 4 0 0 4 0 4 1.1 2 0 2 0 0 2 1.2 3 2 1 0 0 3 1.3 0 0 0 0 0 0 Total 544 38 18 488 1 543 Average Voltage = 0.32 volts Note: (1) This count includes the DSIs that were returned to service through the tube recovery program at 2R23.

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• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-6 Table 3-5: 2R23 DSI Voltage Distribution for SG-C

+POINT Not

+POINT Number of Probe Tested +POINT Returned to Voltage Bin Probe Plugged Indications But Not Probe Service Confirmed Confirmed Tested 0.1 19 0 0 19 0 19 0.2 92 2 0 90 0 92 0.3 104 7 0 97 0 104 0.4 83 10 1 72 0 83 0.5 58 5 2 51 0 58 0.6 31 5 0 26 0 31 0.7 23 5 0 18 0 23 0.8 12 1 0 11 0 12 0.9 5 1 0 4 0 5 1.0 4 2 0 2 0 4 1.1 3 2 1 0 0 3 1.2 0 0 0 0 0 0 1.3 0 0 0 0 0 0 1.4 0 0 0 0 0 0 1.5 1 0 1 0 0 1 Total 435 40 5 390 0 435 Average Voltage = 0.34 volts SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-7 Table 3-6: Indication Distribution as Function of Tube Support Plate SG-A SG-B Largest Average Largest Average Number of Max. Average Growth, Growth, Number of Max. Average Growth, Growth, TSP Indications Volts Volts Volts Volts TSP Indications Volts Volts Volts Volts 02H 135 1.60 0.31 0.38 -0.022 02H 207 1.17 0.36 0.33 0.005 03H 102 1.19 0.33 0.24 0.001 03H 162 1.14 0.34 0.30 0.000 04H 63 1.24 0.28 0.32 -0.006 04H 75 0.81 0.27 0.32 -0.017 05H 55 0.67 0.27 0.20 -0.018 05H 46 0.96 0.26 0.07 0.000 06H 14 0.66 0.24 0.13 -0.027 06H 11 0.46 0.24 0.19 0.002 07H 7 0.41 0.27 0.00 -0.041 07H 12 0.56 0.24 0.04 -0.008 08H 13 0.54 0.23 0.11 -0.003 08H 13 0.64 0.29 0.08 0.006 02C 0 0.00 0.00 0.00 0.000 02C 1 0.47 0.47 0.07 0.070 03C 0 0.00 0.00 0.00 0.000 03C 1 0.28 0.28 -0.03 -0.030 04C 0 0.00 0.00 0.00 0.000 04C 2 0.58 0.35 0.02 0.015 05C 6 0.49 0.28 0.04 0.007 05C 3 0.31 0.25 0.03 -0.057 06C 3 0.28 0.19 0.02 -0.003 06C 4 0.31 0.21 0.00 -0.043 07C 3 0.52 0.34 0.03 0.023 07C 5 0.45 0.36 0.03 -0.020 08C 10 0.35 0.21 0.03 -0.018 08C 2 0.33 0.27 0.03 0.025 Total/Limiting 411 1.60 0.29 0.38 -0.013 Total/Limiting 544 1.17 0.32 0.33 -0.001 SG-C Composite Largest Average Largest Average Number of Max. Average Number of Max. Average TSP Growth, Growth, TSP Growth, Growth, Indications Volts Volts Indications Volts Volts Volts Volts Volts Volts 02H 149 1.07 0.42 0.56 -0.032 02H 491 1.60 0.36 0.56 -0.0144 03H 119 0.83 0.33 0.28 -0.034 03H 383 1.19 0.33 0.30 -0.0108 04H 78 1.44 0.30 0.19 -0.035 04H 216 1.44 0.29 0.32 -0.0202 05H 38 0.59 0.27 0.30 -0.021 05H 139 0.96 0.26 0.30 -0.0130 06H 21 0.41 0.23 0.10 -0.033 06H 46 0.66 0.24 0.19 -0.0239 07H 10 0.48 0.27 0.04 -0.038 07H 29 0.56 0.26 0.04 -0.0262 08H 15 0.53 0.30 0.19 -0.020 08H 41 0.64 0.28 0.19 -0.0067 02C 0 0.00 0.00 0.00 0.000 02C 1 0.47 0.47 0.07 0.0700 03C 0 0.00 0.00 0.00 0.000 03C 1 0.28 0.28 -0.03 -0.0300 04C 0 0.00 0.00 0.00 0.000 04C 2 0.58 0.35 0.02 0.0150 05C 1 0.56 0.56 -0.02 -0.020 05C 10 0.56 0.30 0.04 -0.0150 06C 1 0.98 0.98 0.00 0.000 06C 8 0.98 0.30 0.02 -0.0207 07C 2 0.21 0.18 0.04 -0.105 07C 10 0.52 0.31 0.04 -0.0244 08C 1 0.4 0.40 0.05 0.050 08C 13 0.4 0.23 0.05 -0.0036 Total/Limiting 435 1.44 0.34 0.56 -0.032 Total/Limiting 1390 1.60 0.32 0.56 -0.014 SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-8 Table 3-7: Voltage Growth Cumulative Distribution SG-A SG-B SG-C Composite Voltage Change : Cumulative Cumulative Cumulative Cumulative Number of Number of Number of Number of EOC-23 minus Probability Probability Probability Probability Indications Indications Indications Indications EOC-22 Distribution Distribution Distribution Distribution V<-0.79 1 0.002 0 - 0 - 1 0.0007

-0.79<V-0.7 0 - 0 - 1 0.002 1 0.0015

-0.69<V-0.6 0 - 1 0.002 1 0.005 3 0.0037

-0.59<V-0.5 2 0.007 0 - 1 0.007 3 0.0059

-0.49<V-0.4 2 0.012 1 0.004 0 - 3 0.0081

-0.39<V-0.3 4 0.022 1 0.006 3 0.014 8 0.0140

-0.29<V-0.2 6 0.037 11 0.027 16 0.051 33 0.0383

-0.19<V-0.1 29 0.109 28 0.080 57 0.183 114 0.1221

-0.09 <V0.0 193 0.588 239 0.535 228 0.712 659 0.6071 0.01<V0.1 139 0.933 211 0.937 105 0.956 455 0.9419 0.11<V0.2 19 0.980 26 0.987 12 0.984 57 0.9838 0.21<V0.3 5 0.993 4 0.994 4 0.993 13 0.9934 0.31<V0.4 3 1.000 3 1.000 2 0.998 8 0.9993 0.41<V0.5 0 - 0 - 0 - 0 -

0.51<V0.6 0 - 0 - 1 1.000 1 1.000 0.61<V0.7 0 - 0 - 0 - 0 -

0.71<V0.8 0 - 0 - 0 - 0 -

0.81<V0.9 0 - 0 - 0 - 0 -

V>0.9 0 - 0 - 0 - 0 -

Number of Indications with 403 525 431 1359 Growth Average 0.73% 2.94% -5.74% N/A Percentage Growth SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-9 Table 3-8: Growth Rate as a Function of BOC Voltage Range Number of Average Voltage Average BOC Average Voltage Voltage Range Indications for Growth per Voltage Cycle 23 Growth Growth EFPY SG-A Entire Range 403 0.309 -0.013 -0.009 Vboc<0.75 386 0.277 -0.006 -0.004 Vboc>0.75 17 1.031 -0.165 -0.120 SG-B Entire Range 525 0.32 -0.001 -0.001 Vboc<0.75 498 0.29 0.004 0.003 Vboc>0.75 27 0.89 -0.09 -0.06 SG-C Entire Range 431 0.376 -0.032 -0.023 Vboc<0.75 407 0.342 -0.023 -0.017 Vboc>0.75 24 0.956 -0.180 -0.130 Composite Entire Range 1359 0.336 -0.014 -0.010 Vboc<0.75 1291 0.304 -0.009 -0.006 Vboc>0.75 68 0.958 -0.144 -0.105 Table 3-9: Indications with the Largest Growth in Cycle 23 EOC-22 EOC-23 C23 Growth +POINT SG Row Column TSP No.

Volts Volts Volt/Cycle Probe Tested 2C 11 36 02H 0.44 1.00 0.56 Yes (SAI) 2C 15 39 02H 0.38 0.76 0.38 No 2A 6 35 02H 1.01 1.39 0.38 Yes (SAI) 2C 27 31 02H 0.62 0.97 0.35 No 2B 17 45 02H 0.50 0.83 0.33 Yes (SAI) 2B 19 69 02H 0.51 0.84 0.33 No 2B 3 55 04H 0.19 0.51 0.32 Yes (NDF) 2A 10 34 04H 0.92 1.24 0.32 Yes (SAI) 2A 21 48 04H 0.58 0.89 0.31 No 2C 36 26 05H 0.24 0.54 0.3 No 2B 29 37 03H 0.14 0.44 0.3 No 2C 27 76 03H 0.17 0.45 0.28 No 2B 12 52 02H 0.69 0.96 0.27 No 2B 14 15 03H 0.20 0.45 0.25 No 2A 15 73 03H 0.58 0.82 0.24 No 2A 17 81 03H 0.13 0.36 0.23 No 2C 9 32 02H 0.49 0.72 0.23 No 2A 5 10 03H 0.54 0.76 0.22 No 2C 5 29 02H 0.51 0.73 0.22 No 2B 3 65 03H 0.69 0.90 0.21 Yes (SAI) 2A 4 60 02H 0.33 0.54 0.21 Yes (NDF) 2A 28 56 03H 0.53 0.74 0.21 No SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-10 Figure 3-1: Voltage Distribution in SG-A (Measured vs. Predicted)

Figure 3-2: Voltage Distribution in SG-B (Measured vs. Predicted)

Figure 3-3: Voltage Distribution in SG-C (Measured vs. Predicted)

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-11 Figure 3-4: Number of Measured Bobbin DSI as a Function of TSP Figure 3-5: Voltage Growth / EFPY in SG-A during Cycles 21, 22, and 23 SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-12 Figure 3-6: Voltage Growth / EFPY in SG-B during Cycles 21, 22, and 23 Figure 3-7: Voltage Growth / EFPY in SG-C during Cycles 21 and 22 SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-13 Figure 3-8: Voltage Growth / EFPY in SGs A, B, C and Overall Bounding Growth Curve SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-14 Figure 3-9: Upper 5% of Growth/EFPY for SG-A Figure 3-10: Upper 5% of Growth/EFPY for SG-B Figure 3-11: Upper 5% of Growth/EFPY for SG-C SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-15 Figure 3-12: Cycle 23 Voltage Growth vs. BOC Voltage SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-1 4 DATABASE APPLIED FOR LEAK AND BURST CORRELATIONS 4.1 Tube Material Properties The tube material properties are provided in Table 6-4 of Reference 4 for 7/8-inch diameter tubes. The normalized mean flow stress (sum of yield and ultimate strengths divided by 2) used in the analysis is 68.78 ksi.

4.2 Burst Correlation The burst pressure, Pb, is normalized to a material with a flow stress of 68.78 ksi, which is the mean of the Westinghouse 7/8-inch tube data. The actual material property values for Beaver Valley Unit 2 are slightly higher than the average of all Westinghouse data. The correlation parameters shown in Table 4-1 are taken from Reference 4.

4.3 Leak Rate Correlation The SLB pressure to be applied is 2,560 psi unless a lower pressure can be justified. Therefore, the leak correlation for pressure of 2,560 psi from Reference 4 is used for the leakage predictions. The parameters are shown in Table 4-2. The leak rate criterion is given in terms of gallons per minute as condensed liquid at room temperature.

4.4 Probability of Leak Correlation The probability of leak as a function of indication voltage is taken from Reference 4. The parameters are shown in Table 4-3. In the Monte Carlo analysis, leakage is quantified only if the indication is computed to be a leaker, based on the probability of leak correlation.

4.5 NDE Uncertainties The NDE uncertainties applied for the EOC-23 and EOC-24 voltage projections are described in Reference

1. The probe wear uncertainty has a standard deviation of 7% about a mean of zero and has a cut-off at 15%

based on implementation of the probe wear standard. The analyst variability uncertainty has a standard deviation of 10.3% about a mean of zero with no cut-off. These NDE uncertainty distributions are used in the Monte Carlo analysis to predict the burst probabilities and accident leak rates at EOC-23 and EOC-24.

The voltages reported were adjusted to account for differences between the laboratory standard and the standard used in the field.

4.6 Upper Voltage Repair Limit Per Table 5.4-20 of Reference 12, the Beaver Valley Unit 2 Updated Final Safety Analysis Report (UFSAR),

the pressurizer safety relief valves have a nominal setting of 2485 psig, or the Reactor Coolant System (RCS) design pressure. Applying a 3% allowance for accumulation per Section 2 of Attachment 1 to GL 95-05, the applicable SLB conditions pressure differential across the SG tubes is then 2,560 psig, which is the traditional pressure differential used for prior GL 95-05 analyses. The upper voltage repair limit of 4.60 volts is based on the structural limit in Table 4-1 for a pressure differential of 2,560 psi with a safety factor of 1.4 applied to the differential pressure. The upper voltage repair limit considers the projected voltage growth during the next cycle and NDE uncertainty. The maximum average percentage growth rate as a percentage of BOC voltage values for any SG is seen from Table 3-7 to be 2.94% for SG-B. According to Reference 1, the minimum growth adjustment is 30% per EFPY (43.9% per cycle for the bounding 534 EFPD for Cycle 23). Since this value is higher than the average percentage growth realized for any one SG, it is applied to the upper voltage repair limit calculation. Therefore, the specific maximum growth value of 43.9% and 20% for NDE uncertainty was used to estimate the upper voltage repair limit. This results in an upper voltage repair limit of 7.51 / (1 + 0.439 + 0.20) = 4.58 volts. No indications greater than this voltage were left in service; the largest DSI voltage reported at 2R23 was 1.60 volts.

The analysis takes no credit for power operated relief valve (PORV) actuation even though the PORVs, block valves, and associated testing programs have been shown to satisfy the requirements of GL 90-06, as SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-2 indicated in the NRC Safety Evaluation Report dated May 15, 1995. Crediting the PORVs would effectively increase the upper voltage repair limit by limiting the maximum pressure differential during a postulated SLB event and would reduce the calculated SLB conditions by limiting the maximum pressure differential.

Considering the inspection history of the Beaver Valley Unit 2 SGs, it is unlikely that a bobbin coil DSI voltage of >4.5 volts will be observed within the Beaver Valley Unit 2 SGs.

Table 4-1: 7/8-Inch Tube Burst Pressure vs. Bobbin Amplitude Correlation PB a0 a1 log(Volts)

Parameter Addendum 7 Database Value Intercept, a0 7.4801 Slope, a1 -2.4002 2

Index of Deter., r 79.67%

Std. Deviation, Error 0.8802 Mean of Log(V) 0.3111 SS of Log(V) 51.6595 N (data pairs) 100 (1)

Str. Limit (2560 psi) 7.51V Str. Limit (2405 psi) 9.40V p Value for a1 (2) 5.6010-36 Reference f 68.78 ksi (3)

Notes: (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 demonstrate compliance with the requirement that the value be less than 0.05.

(3) This is the flow stress value to which all data were normalized prior to performing the regression analysis. This affects the coefficient and standard error values. The corresponding values for a flow stress of 75.0 ksi can be obtained from the above values by multiplying by 1.0904.

(4) Reference to this table is Table 6-4 from Reference 4.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-3 Table 4-2: Tube Leak Rate vs. Bobbin Amplitude Correlation Parameters Q 10 b3 b4 log Volts Parameter Addendum 7 Database Value SLB P = 2560 psi Intercept, b3 -0.33476 Slope, b4 0.95311 2

Index of Determination, r 12.4%

Residuals, Error (b5) 0.8175 Mean of Log(Q) 0.7014 SS of Log(Q) 22.8754 p Value for b4 2.4%

SLB P = 2405 psi Intercept, b3 -0.8039 Slope, b4 1.2077 2

Index of Determination, r 20.0%

Residuals, Error (b5) 0.7774 Mean of Log(Q) 0.5090 SS of Log(Q) 22.6667 p Value for b4 0.5%

Common Data Data Pairs, N 32 Mean of Log(V) 1.0871 SS of Log(V) 3.1116 Notes: (1) Reference to this table is Table 6-6 from Reference 4.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-4 Table 4-3: 7/8-Inch Tube Probability of Leak Correlation Parameters 1

Pr(Leak) 1 e b1 b2 log(Volts)

Parameter Addendum 7 Database Value Logistic Intercept, b1 -4.9847 Logistic Slope, b2 7.6110 (1)

Intercept Variance, V11 1.2904 Covariance, V12 -1.7499 Slope Variance, V22 2.8181 Number of Data, N 120 Deviance 33.66 Pearson SD 62.9%

MSE 0.285 Notes: (1) Parameters Vij are the elements of the covariance matrix of the coefficients, i, of the regression equation.

(2) Reference to this table is Table 6-5 from Reference 4.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-1 5 SLB ANALYSIS METHODS A Monte Carlo analysis technique is used to calculate the SLB leak rates and tube burst probabilities for both actual 2R23 and projected EOC-24 voltage distributions. The Monte Carlo analysis accounts for parameter uncertainty. The analysis methodology is described in the Westinghouse generic methods report of Reference 4 as supplemented by References 5 and 6. The Monte Carlo computer program used to implement this method is documented in Reference 9. Essentially the same methodology was applied to leak and burst analyses performed for the original Beaver Valley Unit 1 SGs, Reference 10.

In general, the methodology involves application of correlations for burst pressure, probability of leakage and leak rate to a measured or calculated EOC voltage distribution to estimate the likelihood of tube burst and primary-to-secondary leakage during a postulated SLB event. Uncertainties associated with burst pressure, leak rate probability and leak rate correlation parameters are explicitly included by sampling distributions for the parameter uncertainties through the Monte Carlo sampling process. NDE uncertainties are also included. The voltage distributions used in the leak and burst projections for the next operating cycle are obtained by applying growth data to the BOC distribution. The POD used to generate the BOC voltage distributions considers both detection uncertainty and the likely occurrence of new indications. Comparisons of projected EOC voltage distributions with actual distributions after a cycle of operation for a number of plants have shown that the Monte Carlo analysis technique yields conservative estimates for EOC voltage distribution as well as leak and burst results based on those distributions.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-1 6 BOBBIN VOLTAGE DISTRIBUTIONS This section describes the input data used to calculate EOC bobbin voltage distributions and presents results of calculations to project EOC-24 voltage distributions.

6.1 Calculation of Voltage Distributions The analysis for EOC-24 voltage distribution starts with an initial voltage distribution which is projected to the EOC conditions based on the growth rate and the anticipated cycle operating duration. The number of indications assumed in the analysis to project EOC voltage distributions, SLB leak rates and tube burst probabilities is obtained by adjusting the number of reported indications using a POD, which accounts for both the detection uncertainty and the development of new indications over the projection period. This is accomplished by using a POD factor, which is defined as the ratio of the actual number of indications detected to total number of indications present. A conservative value is assigned to the POD based on historical data, and the value used herein is discussed in Section 6.2. The calculation of projected bobbin voltage frequency distribution is based on a net total number of indications returned to service, defined as follows.

where, Variable Description Number of bobbin indications being returned to service for the next cycle Number of bobbin indications (in tubes in service) identified by inspection after the previous cycle Probability of detection, Number of Ni which are repaired (plugged) after the last cycle Number of indications in tubes deplugged after the last cycle and returned to service in accordance with voltage-based repair criteria There are deplugged tubes returned to service at the beginning of Cycle 24 (BOC-24); therefore, Ndeplugged > 0.

One tube with a DSI indication was plugged (SG 2B R18C12), therefore Nrepaired = 1. Indications that were found to have no degradation found (NDF) from 2R23 RPC exams were retained in the indication dataset provided in Table 6-1 since the measured and predicted indications for GL 95-05 evaluation are based on bobbin detection. During the Monte Carlo simulations, voltages for bins with several indications are selected by randomly sampling the voltage bins. For a few higher voltage indications in each SG, each indication is considered to be in a separate bin, and the actual indication voltage is utilized in the calculations.

The methodology used in the projection of EOC-24 bobbin voltage frequency distributions is described in Reference 3, and it is essentially the same as that used in the original Beaver Valley Unit 1 SGs, Reference 10.

6.2 Probability of Detection The Generic Letter 95-05 (Reference 1) requires the application of a constant POD value of 0.6 to define the BOC distribution for EOC voltage projections unless an alternate POD is approved by the NRC. A POD value of 1.0 represents the ideal situation where all indications are detected. In this report, the Reference 1 POD value of 0.6 is used for the EOC-24 projection.

6.3 Limiting Growth Rate Distribution As discussed in Section 3.2, the NRC guidelines in Generic Letter 95-05 stipulate that the more conservative growth rate distributions from the past two inspections should be utilized for projecting EOC distributions for the next cycle. For conservatism, a growth rate curve which bounded the growth rates of the past three cycles was used (Figure 3-5, Figure 3-6 and Figure 3-7). Growth distributions used in the Monte Carlo SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-2 calculations are specified in the form of a histogram, so no interpolation is performed between growth bins.

This assures that the largest growth value in the distribution is utilized in the Monte Carlo simulations.

6.4 Cycle Operating Period The operating periods used in the growth rate/EFPY calculations and voltage projections are as follows.

Cycle 23 503.39 EFPD 1.378 EFPY (actual)

Cycle 24 534.0 EFPD 1.462 EFPY (assumed) 6.5 Projected EOC-24 Voltage Distribution Calculations for the EOC-24 bobbin voltage projections were performed for all three SGs based on the 2R23 distributions shown in Table 6-1. The BOC-24 distributions were adjusted to account for probability of detection as described above, and the adjusted number of indications at BOC-24 is also shown in Table 6-1.

Calculations were performed using a constant POD of 0.6 and 1,000,000 Monte Carlo trials. The distribution of indications at BOC-24 and the distribution of indications projected at EOC-24 are shown in Figure 6-1, Figure 6-2 and Figure 6-3 for SG-A, SG-B and SG-C, respectively. SG-B contains the largest number of indications at BOC-24. Reporting the maximum predicted voltage is not required by GL 95-05, but it is arbitrarily chosen to be the voltage where the integration of the upper tail of the voltage distribution reaches a 0.3 fractional indication.

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WESTINGHOUSE PROPRIETARY CLASS 6-3 Table 6-1: Predicted Voltage Distribution at EOC-24 SG-A Number of Indications SG-B Number of Indications SG-C Number of Indications Volt Bins Measured Input Predicted Measured Input Predicted Measured Input Predicted EOC-23 BOC-24 EOC-24 EOC-23 BOC-24 EOC-24 EOC-23 BOC-24 EOC-24 0.1 40 66.67 39.3 39 65 38.99 19 31.67 19.9 0.2 116 193.33 124.94 138 229 143.82 92 153.33 94.14 0.3 103 171.67 154.06 124 206.67 183.1 104 173.33 140.91 0.4 71 118.33 129.73 84 140 157.7 83 138.33 136.94 0.5 40 66.67 90.98 73 121.67 128.93 58 96.67 110.25 0.6 15 25 53.83 40 66.67 92.05 31 51.67 77.3 0.7 9 15 30.39 17 28.33 55.85 23 38.33 51.81 0.8 5 8.33 18.13 6 10 33.46 12 20 33.44 0.9 4 6.67 12.06 14 23.33 23.28 5 8.33 21.16 1.0 2 3.33 7.67 4 6.67 15.71 4 6.67 13.21 1.1 1 1.67 5.4 2 3.33 10.41 3 5 8.34 1.2 1 1.67 4.94 3 5 8.22 0 0 6 1.3 2 3.33 4.06 0 0 5.68 0 0 4.09 1.4 1 1.67 3.14 0 0 3.53 0 0 2.73 1.5 0 0 2.25 0 0 2.22 1 1.67 1.8 1.6 1 1.67 1.5 0 0 1.27 0 0 1.16 1.7 0 0 0.99 0 0 0.45 0 0 0.76 1.8 0 0 0.62 0 0 0 0 0 0.06 1.9 0 0 0 0 0 0.7 0 0 0.7 2.0 0 0 0.7 0 0 0.3 0 0 0 2.1 0 0 0 0 0 0 0 0 0.3 2.2 0 0 0.3 0 0 0 0 0 0 Total 411 685 685 544 905.67 905.67 435 725 725 SG-CDMP-23-10 July 2023 Revision 1

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-4 Figure 6-1: SG-A Predicted Voltage Distribution at EOC-24 Figure 6-2: SG-B Predicted Voltage Distribution at EOC-24 Figure 6-3: SG-C Predicted Voltage Distribution at EOC-24 SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-1 7 SLB LEAK RATE AND TUBE BURST PROBABILITY ANALYSES This section presents the results of the analyses carried out to predict leak rates and tube burst probabilities at the postulated SLB conditions using the actual voltage distributions from the 2R23 inspection (CM assessment) as well as for the projected EOC-24 voltage distributions (OA). The methodology used in these analyses is described in Section 6.

7.1 2R23 Condition Monitoring Leak Rate and Tube Burst Probability Analyses to calculate the 2R23 SLB leak rates and tube burst probabilities were performed using the actual bobbin voltage distributions presented in Table 3-3, Table 3-4, and Table 3-5. The results of the Monte Carlo calculations are summarized in Table 7-1, in addition to the 2R23 predictions from the EOC-22 OA performed in Reference 2. As evident from the results in Table 7-1, the methodology utilized for the OA is conservative in the prediction of the number and size of indications by the end of the following operating cycle. As a result, the OA produces conservative results for leak rate and burst probability by the end of the next operating cycle.

The SLB leak rates and tube burst probabilities, calculated using the actual measured 2R23 voltage distributions using 1,000,000 Monte Carlo trials, are shown in Table 7-1. The methodology used for these calculations is documented in Reference 3. The probability of leak, leak rate, and burst pressure correlations for 7/8-inch tubes presented in the latest addendum to the EPRI Alternate Repair Criteria (ARC) Database, Reference 4, were used. The SLB primary-to-secondary pressure differential applied in the analysis is 2,560 psi. The maximum 2R23 leak rate of 0.051 gpm and the maximum conditional burst probability of 1.44 x 10-5 are well below their respective allowable limits (8.1 gpm per Reference 17 and 1.0 x 10-2 per Reference 1, respectively). Therefore, the CM performance criteria are satisfied.

7.2 Cycle 24 Operational Assessment Leak Rate and Tube Burst Probability The SLB leak rate and tube burst probability OA projection for the EOC-24 was carried out using the latest update to the ARC database documented in Reference 4, the POD of 0.60, and 1,000,000 Monte Carlo trials.

The EOC-24 leak and burst analyses were performed using a primary-to-secondary pressure differential of 2,560 psi, even though it is likely that PORV actuation will occur prior to the pressurizer safety relief valve lift setting.

The EOC-24 projections, considering a 534 EFPD operation cycle and using POD = 0.6 are shown in Table 7-2. Both the maximum projected EOC-24 leak rate of 0.224 gpm and the maximum conditional burst probability of 3.14 x 10-5 are well below their respective allowable limits (8.1 gpm and 1.0 x 10-2, respectively). Therefore, the OA performance criteria for population of indications covered by GL 95-05 are satisfied for Cycle 24.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-2 Table 7-1: Condition Monitoring Leak and Burst Results for 2R23 OA Performed OA Performed at EOC-22 EOC-23 Actual at EOC-22 EOC-23 Actual Actual Predicted Predicted Actual Predicted Number of SLB Leak Probability SLB Leak Actual Number of Predicted Indications Actual Rate at of Burst at Rate at Probability of Indications Max. at EOC- Max. 95/95 95% 95/95 Burst at 95%

SG at EOC-23 Voltage 23(1) Voltage (gpm) Confidence (gpm) Confidence A 677 2.2 409 1.60 0.171 3.38 x 10-5 0.037 1.32 x 10-5

-5 B 879 2.0 537 1.17 0.201 3.26 x 10 0.051 1.32 x 10-5

-5 C 720 2.1 435 1.44 0.229 3.95 x 10 0.046 1.44 x 10-5 (1) Number of indications reported at EOC before the tube recovery program.

Table 7-2: Operational Assessment Leak and Burst Results for EOC-24 (POD = 0.6)

Growth Rate Number of SLB Leak Rate Probability of Maximum Volts SG Used in Indications at at 95/95 Burst at 95%

at EOC-24 Projection EOC-24 (gpm) Confidence SG-A Cycle 23 Bound 685 2.1 0.150 2.67 x 10-5 SG-B Cycle 23 Bound 906 2.0 0.224 2.91 x 10-5 SG-C Cycle 23 Bound 725 2.1 0.189 3.14 x 10-5 SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-1 8 REFERENCES

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

2. Westinghouse Report SG-CDMP-21-31, Revision 2, Beaver Valley Unit 2 Refueling Outage 22 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report, August 2022.

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

4. EPRI Report 1018047, Addendum 7 to NP-7480-L Database, Steam Generator Tubing Outside Diameter Stress Corrosion Cracking at Tube Support Plates Database for Alternate Repair Limits, September 2008.

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

March 15, 2002.

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

7. Westinghouse Letter DLC-96-184, Revision 0, Duquesne Light Company Beaver Valley Power Station Unit 2 Steam Generator LOCA Plus SSE Loads, June 1996.

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

9. Westinghouse Letter LTR-CDME-08-167, Revision 0, Software Release Letter for CycleSim Version 3.2, July 2008.

10. Westinghouse Report SG-SGDA-05-1, Revision 1, Beaver Valley Unit 1 Cycle 17 Voltage-Based Repair Criteria 90-Day Report, January 2005.

11. Not Used.

12. Beaver Valley Power Station Unit 2, Updated Final Safety Analysis Report, Revision 23.

13. FENOC Procedure ISIE1-8, Revision 18, Beaver Valley Power Station Unit 2 Steam Generator Examination Guidelines, October 8, 2018.

14. Steam Generator Management Program: Pressurized Water Reactor Steam Generator Examination Guidelines, Revision 8. EPRI, Palo Alto, CA: 2016. 3002007572.

15. Westinghouse Letter LTR-CDMP-20-12, Revision 0, Beaver Valley Unit 2 0.630 Wide Groove Bobbin Probe Evaluation, April 2020.

16. Not Used.

17. U.S. NRC letter to Energy Harbor Nuclear Corp., BEAVER VALLEY POWER STATION, UNITS 1 AND 2 - ISSUANCE OF AMENDMENT NOS. 305 AND 195 TO MODIFY PRIMARY AND SECONDARY COOLANT ACTIVITY TECHNICAL SPECIFICATIONS (EPID L-2019-LLA-0223),

September 2020.

18. U.S. NRC letter to Energy Harbor Nuclear Corp., BEAVER VALLEY POWER STATION, UNITS 1 AND 2 - CORRECTION TO AMENDMENT NOS. 305 AND 195 ISSUED SEPTEMBER 23, 2020, RE:

MODIFICATION OF PRIMARY AND SECONDARY COOLANT ACTIVITY TECHNICAL SPECIFICATIONS (EPID L-2019-LLA-0223), October 2020.

SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-1 APPENDIX A Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG TOTAL 27 0 6 0 2 2 24 0.28 07H 2 88 0.16 02H 2 92 0.42 03H 2 93 0.45 03H 3 15 0.6 03H 3 59 0.6 02H NDF 3 63 0.42 05C 3 64 0.49 05C 3 65 0.41 07H 3 65 0.52 07C 3 77 0.47 08H SAI 3 79 0.34 07H 3 81 0.58 03H 3 84 0.63 03H 3 85 0.63 04H 3 92 0.33 02H 4 9 0.33 03H 4 9 0.34 04H 4 18 0.16 05H 4 21 0.4 03H 4 24 0.27 02H 4 26 0.26 02H 4 28 0.5 03H 4 34 0.41 03H 4 39 0.06 02H 4 50 0.13 02H 4 50 0.36 03H 4 50 0.4 04H 4 54 0.68 02H 4 54 0.24 04H 4 54 0.29 05H 4 60 0.54 02H NDF 4 60 0.34 06H NDF 4 63 0.3 02H 4 70 0.22 03H 4 78 0.28 05H 4 80 0.35 08C 4 85 0.1 08C 4 86 0.26 03H 5 10 0.9 02H 5 10 0.76 03H 5 10 0.38 04H 5 11 0.26 04H 5 18 0.66 06H SAI 5 20 0.21 08C 5 24 0.26 07H 5 25 0.58 05H 5 26 0.75 02H 5 26 0.58 03H 5 29 1.21 02H SAI 5 30 0.13 03H 5 53 0.11 02H 5 57 0.17 04H 5 60 0.03 04H 5 80 0.18 05H 5 82 0.24 03H 6 15 0.36 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-2 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 6 20 0.34 04H 6 27 0.22 06H 6 32 0.23 02H 6 34 0.39 02H 6 35 1.39 02H SAI 6 35 0.33 03H 6 35 0.52 04H 6 35 0.33 05H 6 35 0.1 08H 6 40 0.34 03H 6 40 0.27 04H 6 41 0.23 08H SAI 6 43 0.27 02H 6 68 0.45 03H SAI 7 4 0.14 04H SAI 7 14 0.26 03H 7 18 1.60 02H NDF 7 18 0.4 03H 7 18 0.36 05H 7 19 0.42 02H 7 19 1.19 03H NDF 7 27 0.38 05H 7 49 0.15 02H 7 51 0.3 02H 7 51 0.26 05H 7 94 0.2 02H 8 16 0.21 05H 8 19 0.38 02H 8 28 0.29 02H 8 29 0.17 02H 8 32 0.38 03H 8 32 0.67 05H SAI 8 34 0.43 03H 8 35 0.19 04H SAI 8 35 0.17 05H SAI 8 42 0.24 02H 8 65 0.32 03H 8 67 0.21 02H 8 69 0.27 02H 8 76 0.12 05H 8 77 0.1 08H SAI 8 85 0.04 02H 8 89 0.21 05H 8 91 0.33 04H 8 93 0.46 03H 9 7 0.3 02H SAI 9 10 1.06 02H NDF 9 13 0.26 02H 9 14 0.1 03H 9 16 0.52 02H 9 16 0.45 03H 9 16 0.4 04H 9 18 0.3 05H 9 31 0.49 02H 9 34 0.2 02H SAI 9 35 0.41 02H 9 38 0.41 05H 9 40 0.44 03H 9 40 0.28 05H 9 51 0.64 04H SAI SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-3 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 9 56 0.2 02H 9 56 0.25 04H 9 57 0.17 02H 9 57 0.32 03H 9 74 0.13 03H 10 7 0.3 02H 10 7 0.36 03H 10 8 0.21 03H 10 19 0.29 04H 10 34 1.24 04H SAI 10 37 0.22 03H 10 38 0.1 04H 10 58 0.17 04H 10 76 0.37 05H 10 80 0.25 08C SAI 11 2 0.64 03H 11 48 0.82 02H 11 48 0.54 08H 11 77 0.35 05H 11 78 0.14 05H 11 78 0.18 06H 12 16 0.69 02H SAI 12 34 0.25 02H 12 48 0.34 05H 12 62 0.29 07C 12 69 0.42 02H 12 69 0.21 03H 12 70 0.28 03H 12 72 0.16 02H 12 73 0.18 05H 12 74 0.46 02H 12 74 0.4 03H 12 80 0.13 05H 13 32 0.07 02H 13 49 0.08 04H 13 60 0.49 02H 13 65 0.14 06C 13 67 0.28 06C 13 71 0.19 04H 13 80 0.37 03H 13 84 0.3 02H 13 85 0.48 02H 13 86 0.25 03H 13 91 0.23 05C 13 91 0.26 05H 13 92 0.49 04H 14 15 0.18 04H 14 20 0.22 03H 14 25 0.21 05H 14 27 0.35 05H 14 31 0.21 02H 14 31 0.17 05H 14 40 0.17 05H SAI 14 46 0.09 02H 14 47 0.18 02H 14 47 0.2 04H 14 48 0.48 05H 14 50 0.18 03H 14 53 0.03 02H 14 54 0.35 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-4 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 14 58 0.33 02H 14 59 0.18 02H 14 59 0.25 03H 14 59 0.41 06H 14 65 0.39 03H 14 68 0.33 02H 14 70 0.38 02H 14 70 0.73 03H 14 71 0.14 02H 14 71 0.26 03H 14 71 0.08 04H 14 72 0.23 06H 14 77 0.1 02H 14 80 0.18 03H 14 86 0.27 04H 15 27 0.15 05H 15 31 0.33 04H SAI 15 63 0.09 02H 15 67 0.22 02H 15 67 0.17 03H 15 71 0.09 02H 15 72 0.15 02H 15 73 0.82 03H 15 73 0.18 05H 15 74 0.32 03H 15 75 0.73 02H 15 75 0.18 07H 15 75 0.44 08H SAI 16 11 0.26 05H SAI 16 50 0.26 05C 16 52 0.58 02H 16 53 0.29 03H 16 60 0.14 02H 16 62 0.09 08H 16 66 0.19 03H 16 70 0.32 03H 16 72 0.09 02H 16 76 0.23 02H 16 77 0.16 05H 17 10 0.26 03H 17 27 0.09 04H 17 32 0.31 05H 17 54 0.19 03H 17 59 0.28 02H 17 59 0.19 05H 17 76 0.37 02H 17 81 0.36 03H 17 81 0.18 04H 17 84 0.11 03H 18 7 0.26 04H 18 10 0.65 03H 18 10 0.19 04H 18 14 0.21 04H 18 27 0.1 07H 18 30 0.07 04H 18 47 0.16 02H 18 47 0.38 05H 18 48 0.26 02H 18 57 0.45 02H 18 58 0.5 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-5 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 18 88 0.06 05H 19 7 0.29 02H 19 7 0.2 03H SAI 19 8 0.29 03H 19 15 0.13 03H 19 15 0.11 04H 19 56 0.35 03H 19 57 0.45 02H 19 57 0.22 04H 19 60 0.25 02H 20 7 0.08 08C 20 9 0.18 03H 20 10 0.17 04H 20 12 0.1 02H 20 22 0.23 02H 20 22 0.28 03H 20 22 0.23 08H 20 44 0.11 02H 20 50 0.33 08C 20 57 0.03 02H 20 62 0.34 05H 20 75 0.36 05H 20 78 0.1 04H 20 85 0.31 03H 21 18 0.44 04H 21 25 0.16 03H 21 26 0.41 05H 21 34 0.41 02H 21 43 0.3 02H 21 46 0.16 02H 21 48 0.89 04H 21 55 0.07 02H 21 61 0.21 08H 21 72 0.25 03H 21 73 0.39 03H 21 78 0.2 08H 21 87 0.09 08C 22 7 0.19 02H 22 21 0.11 02H 22 21 0.38 03H 22 23 0.2 02H 22 24 0.31 02H 22 25 0.2 02H 23 11 0.44 02H 23 11 0.08 03H 23 19 0.59 02H 23 20 0.17 02H 23 21 0.14 03H 23 25 0.33 03H 23 52 0.26 03H 23 53 0.16 02H SAI 23 53 0.17 04H 23 87 0.37 04H 24 16 0.34 02H 24 16 0.12 03H 24 23 0.09 05H 24 24 0.09 02H 24 33 0.17 03H 24 39 0.22 02H 24 52 0.15 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-6 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 24 63 0.39 05H 24 80 0.13 03H 25 16 0.53 04H 25 21 0.1 02H 25 22 0.25 02H 25 30 0.39 04H 25 30 0.12 06H 25 50 0.11 08H 26 15 0.16 03H 26 19 0.12 04H 26 42 0.14 02H 26 64 0.15 02H 26 80 0.12 05H 27 32 0.18 02H 27 33 0.44 03H 27 34 0.23 04H 27 34 0.19 05H 27 42 0.23 04H SAI 27 42 0.18 05H 27 47 0.31 02H 27 55 0.13 03H 27 55 0.16 04H 27 64 0.06 02H 27 75 0.28 05H 28 13 0.34 03H 28 26 0.53 04H 28 41 0.16 02H 28 42 0.33 03H 28 45 0.43 02H 28 46 0.16 03H 28 54 0.23 02H 28 56 0.74 03H 28 66 0.15 04H SAI 29 24 0.23 02H 29 24 0.2 04H 29 30 0.42 05H 29 48 0.09 04H 29 54 0.27 03H SAI 29 65 0.06 02H 29 81 0.22 05H 30 22 0.16 02H 30 28 0.19 03H 30 38 0.18 02H 30 48 0.43 04H 30 48 0.13 06H 30 50 0.16 05C 30 51 0.3 08C 30 54 0.32 04H 30 58 0.09 04H 30 63 0.09 08H 30 68 0.21 02H 31 14 0.38 04H 31 18 0.59 02H 31 18 0.39 03H 31 18 0.32 07H 31 74 0.42 02H SAI 32 22 0.14 02H 32 27 0.19 03H 32 35 0.1 06H 32 38 0.15 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-7 Table A-1: SG-A 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 32 38 0.21 03H 32 45 0.23 02H 32 51 0.12 05H 32 53 0.28 03H 32 59 0.34 05H 33 18 0.12 02H 33 18 0.28 03H 33 22 0.19 02H 33 27 0.25 06H 33 42 0.17 05H 33 54 0.19 06H 33 57 0.34 04H 33 70 0.1 05H 34 24 0.12 03H 34 40 0.21 03H 34 52 0.09 02H 34 53 0.17 02H 34 56 0.18 05H 34 60 0.17 02H 35 36 0.16 03H 35 45 0.46 02H 36 23 0.2 08C 36 28 0.31 03H 36 28 0.13 04H 36 44 0.18 03H 36 46 0.15 06H 36 56 0.2 07C 37 30 0.22 08H 37 39 0.22 02H 37 39 0.21 03H 37 42 0.32 03H 37 48 0.21 04H 37 54 0.18 05H 37 56 0.2 02H 37 56 0.37 03H 38 40 0.5 05H 38 44 0.22 02H 39 23 0.92 02H 39 42 0.29 02H 39 46 0.33 02H 39 47 0.41 02H 39 50 0.21 04H 40 29 0.19 02H 40 37 0.94 03H 40 44 0.14 06C 41 27 0.25 03H 42 64 0.31 04H 44 35 0.25 03H 44 40 0.14 05C 44 58 0.14 06H 45 48 0.2 08C 46 52 0.25 06H 16 22 0.29 03H DEPLUG 16 22 0.26 04H DEPLUG SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-8 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG TOTAL 33 5 18 1 7 1 43 0.47 02H 1 52 0.26 02H 1 56 0.14 02H 1 57 0.25 04H 1 81 0.16 02H 2 15 1.1 02H NDF 2 15 0.82 03H SAI 2 28 0.24 02H 2 33 0.11 03H 2 54 0.09 04H 2 63 0.11 04H 2 65 0.43 03H 2 67 0.2 06H 2 69 0.1 05H 2 70 0.7 05H 2 73 0.41 03H 2 73 0.13 04H 2 73 0.16 05H 2 75 0.13 02H 2 94 0.33 04H 3 31 0.57 02H 3 32 0.26 03H 3 43 0.43 02H SAI 3 49 0.58 04C 3 54 0.52 02H 3 55 0.82 02H NDF 3 55 0.51 04H NDF 3 58 0.32 03H NDF 3 60 0.43 02H 3 60 0.42 03H 3 61 0.46 06H 3 62 0.41 03H 3 62 0.14 04H 3 63 0.56 02H 3 63 0.48 03H 3 65 0.9 03H SAI 3 72 0.29 03H 3 88 0.36 04H 3 88 0.37 07C 3 89 0.31 04H 4 23 0.39 02H 4 23 0.35 06H 4 29 0.56 02H 4 32 0.23 03H 4 36 0.73 04H MAI 4 41 0.3 02H 4 41 0.13 04H 4 43 0.11 02H 4 44 0.17 02H 4 48 0.56 03H NDF 4 51 0.31 05C 4 52 0.55 03H 4 54 0.83 02H 4 56 0.34 04H 4 57 0.32 02H 4 57 0.23 04H 4 58 0.51 02H 4 58 0.47 02C NDF 4 59 0.64 02H NDF SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-9 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 4 59 0.54 03H NDF 4 62 0.21 03H 4 62 0.25 07H 4 63 0.26 04H 4 68 0.28 02H 4 88 0.24 04H 5 10 0.27 02H 5 12 0.09 03H 5 14 0.26 03H 5 20 0.15 03H 5 22 0.05 04H 5 28 0.41 02H 5 33 0.46 02H 5 52 0.57 02H 5 54 0.63 02H 5 54 0.2 03H 5 54 0.44 07C 5 56 0.31 03H 5 58 0.25 02H 5 59 0.19 04H 5 60 0.22 02H 5 62 0.25 03H 5 63 0.19 04H 5 64 0.45 02H 5 64 0.12 03H 5 68 0.27 02H 5 70 0.96 05H 5 71 0.32 02H 5 71 0.31 06C 5 73 0.24 02H 5 73 0.12 04H 5 75 0.16 03H 5 75 0.31 04H 5 81 0.13 05H 5 92 0.22 02H 5 93 0.36 03H 6 16 0.09 03H 6 23 0.18 04H 6 25 0.31 03H 6 26 0.2 02H 6 27 0.23 03H SAI 6 31 0.64 03H MAI 6 38 0.51 02H 6 43 0.48 03H 6 52 0.14 02H 6 53 0.35 02H 6 53 0.08 03H 6 58 0.45 02H 6 58 0.22 03H 6 61 0.19 08H 6 63 0.19 02H 6 66 0.79 03H 6 66 0.17 05H 6 70 0.81 05H 7 52 0.71 02H 7 54 0.2 02H 7 56 1.17 02H NDF 7 56 0.23 06C 7 63 0.32 07H 7 64 0.24 04H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-10 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 7 70 0.31 04H 7 70 0.27 05H 7 75 0.11 02H 8 2 0.11 03H 8 3 0.33 06H 8 9 0.36 02H 8 9 0.29 03H 8 18 0.25 02H 8 18 0.21 03H 8 20 0.29 02H 8 22 0.49 02H 8 31 0.32 07C 8 37 0.15 03H 8 53 0.91 02H 8 53 0.34 03H 8 56 0.35 03H 8 56 0.22 08H 8 57 0.23 08H 8 59 0.29 02H 8 59 0.19 05H 8 63 0.37 04H 9 4 0.44 03H SAI 9 5 0.14 03H 9 8 0.21 03H 9 11 0.49 02H 9 11 0.42 03H 9 16 0.13 03H 9 17 0.41 02H 9 17 0.29 03H 9 18 0.07 02H 9 18 0.47 03H 9 26 0.24 02H 9 26 0.55 03H 9 52 0.1 02H 9 52 0.22 03H 9 59 0.35 03H 9 59 0.39 05H 9 61 0.45 07C 9 64 0.41 04H SAI 9 70 0.15 03H 9 70 0.4 05H 9 72 0.32 04H 9 77 0.17 04H 9 80 0.5 02H 9 85 0.54 02H 9 92 0.46 02H 9 93 0.5 02H 10 6 0.36 02H 10 10 0.01 02H 10 14 0.21 02H 10 15 0.33 02H 10 17 0.61 02H 10 18 0.24 02H 10 26 0.21 02H 10 26 0.19 05H 10 32 0.56 03H MAI 10 37 0.3 03H 10 41 0.08 07H 10 50 0.32 02H 10 50 0.19 03H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-11 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 10 50 0.19 04H 10 52 0.5 02H 10 52 0.19 04H 10 53 0.77 02H 10 54 0.13 02H 10 56 0.39 02H 10 56 0.12 03H 10 58 0.15 05H 10 63 0.16 02H 10 71 0.18 02H 10 71 0.33 05H 10 76 0.32 03H SAI 10 78 0.61 04H 10 80 0.23 03H 10 82 0.17 03H 10 88 0.12 04C 10 89 0.34 02H 11 8 0.22 03H 11 8 0.13 04H 11 9 0.1 06H 11 9 0.38 07H 11 18 0.43 02H 11 20 0.56 02H 11 21 0.18 03H 11 23 0.64 02H SAI 11 25 0.35 03H SAI 11 35 0.09 02H 11 42 0.18 03H 11 51 0.05 02H 11 53 0.43 02H 11 53 0.33 08C 11 57 0.25 03H NDF 11 58 0.28 03H 11 58 0.21 04H 11 61 0.82 02H 11 61 0.44 03H 11 64 0.31 03H 11 75 0.5 02H NDF 11 75 0.2 03H NDF 11 83 0.31 03H 11 83 0.22 04H 11 91 0.42 08H 12 10 0.35 02H 12 15 0.24 02H 12 15 0.55 03H 12 16 0.21 03H 12 22 0.57 02H 12 24 0.53 02H 12 24 0.37 04H 12 51 0.11 02H 12 52 0.96 02H 12 52 0.53 03H 12 61 0.28 03H 13 37 0.33 03H 13 39 0.14 07H 13 47 0.32 02H SAI 13 53 0.49 02H 13 56 0.31 03H 13 71 0.26 05C 13 73 0.3 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-12 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 13 77 0.51 03H 13 78 0.09 02H 13 78 0.19 06C 13 85 0.32 02H 13 86 0.14 02H 13 91 0.34 02H 14 13 0.17 02H 14 15 0.45 03H 14 18 0.46 02H 14 25 0.34 02H 14 27 0.15 03H 14 28 0.08 05H 14 32 0.12 02H 14 35 0.31 06H 14 36 0.29 03H 14 39 0.1 02H 14 54 0.35 02H 14 54 0.17 03H 14 57 0.48 02H 14 57 0.46 03H 14 61 0.48 02H 14 61 0.57 03H 14 61 0.38 05H 14 63 0.25 03H 14 70 0.47 02H 14 80 0.23 03H 14 83 0.28 03C NDF 14 84 0.23 04H 14 88 0.16 02H 15 12 0.15 03H 15 21 0.09 03H 15 26 0.38 03H 15 26 0.11 07H 15 27 0.1 02H 15 36 0.3 02H 15 43 0.19 06H 15 49 0.52 04H 15 52 0.2 02H 15 71 0.16 05H 15 75 0.14 02H 15 75 0.2 04H 15 80 0.36 04H 15 87 0.26 02H 15 89 0.33 02H 16 12 0.29 04H SAI 16 14 0.52 03H SAI 16 27 0.12 03H 16 29 0.11 02H SAI 16 31 0.11 02H 16 31 0.21 07H 16 36 0.23 04H 16 37 0.2 02H 16 37 0.24 04H SAI 16 44 0.18 02H 16 55 0.34 04H 16 55 0.22 05H 16 57 0.16 03H 16 61 0.28 02H 16 68 0.44 03H SAI 16 71 0.15 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-13 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 17 26 0.98 03H 17 31 0.28 02H 17 31 1.14 03H SAI 17 32 0.88 02H MAI 17 32 0.31 03H 17 35 0.44 03H 17 40 0.29 03H SAI 17 42 0.6 03H 17 42 0.44 04H 17 43 0.25 04H 17 44 0.56 02H SAI 17 45 0.83 02H SAI 17 62 0.43 05H 17 64 0.07 02H 17 68 0.4 02H 17 68 0.49 03H 17 68 0.81 04H SAI 17 83 0.11 06C 17 88 0.2 07C 18 12 0.15 03H PLUG 18 18 0.12 02H 18 25 0.59 02H 18 25 0.29 03H 18 28 0.45 04H 18 29 0.52 02H 18 30 0.21 04H 18 36 0.85 03H 18 37 0.16 03H 18 38 0.43 03H 18 40 0.41 02H 18 41 1.16 02H MAI 18 42 0.42 02H 18 43 0.15 02H 18 43 0.13 03H 18 53 0.37 03H 18 53 0.24 04H 18 54 0.63 02H 18 57 0.35 03H 18 58 0.32 02H 18 61 0.09 03H 18 64 1.07 03H NDF 18 69 0.08 04H 18 69 0.28 05H 18 74 0.21 02H 18 76 0.31 03H 18 76 0.21 05H 19 15 0.15 02H 19 15 0.02 04H 19 29 0.75 02H 19 29 0.69 03H 19 30 0.43 03H SAI 19 33 0.5 02H 19 34 0.45 02H SAI 19 36 0.54 02H 19 39 0.59 03H 19 39 0.28 04H 19 40 0.36 03H 19 45 0.32 02H 19 50 0.44 03H 19 51 0.35 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-14 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 19 51 0.58 03H 19 69 0.84 02H 19 71 0.11 05H 19 74 0.25 02H 19 76 0.16 02H 19 78 0.1 02H 19 85 0.24 02H 20 11 0.65 02H 20 16 0.25 03H 20 19 0.06 04H 20 20 0.21 03H 20 20 0.25 04H 20 23 0.14 02H SAI 20 27 0.19 02H 20 27 0.49 04H 20 36 0.37 08H 20 70 0.04 02H 20 78 0.24 04H 20 81 0.35 02H 20 89 0.46 02H 21 10 0.43 03H 21 18 0.16 04H 21 29 0.4 03H 21 32 0.42 03H 21 45 0.28 04H 21 53 0.42 03H 21 53 0.26 05H 21 54 0.54 02H 21 75 0.16 02H 21 85 0.45 02H 22 18 0.86 03H SAI 22 36 0.15 03H 22 52 0.13 02H 22 52 0.26 03H 22 53 0.27 02H 22 61 0.25 05H 22 62 0.28 03H 22 64 0.25 02H 23 33 0.21 03H 23 37 0.51 04H SAI 23 56 0.18 02H 23 61 0.17 02H 23 63 0.11 03H 23 63 0.18 05H 23 67 0.23 05H 23 86 0.12 02H 24 29 0.08 05H 24 30 0.23 03H 24 32 0.32 03H 24 42 0.42 02H 24 51 0.12 08H 24 52 0.48 02H 24 56 0.17 02H 24 58 0.28 03H 24 62 0.41 03H 24 63 0.25 03H 24 65 0.09 02H 24 68 0.15 08H 24 71 0.16 05H 24 79 0.1 07H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-15 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 24 84 0.25 05H 25 17 0.09 02H 25 18 0.19 05C 25 23 0.35 03H 25 24 0.49 03H 25 29 0.13 02H 25 38 0.13 04H 25 64 0.26 06H 25 79 0.44 08H 26 30 0.42 03H 26 39 0.07 03H 26 78 0.11 02H 27 17 0.15 05H 27 28 0.29 03H 27 46 0.15 06H 27 52 0.37 04H 27 53 0.2 03H 27 68 0.2 02H 28 33 0.26 02H SAI 28 41 0.2 02H 28 59 0.61 04H 28 63 0.14 03H 28 67 0.25 03H 28 81 0.18 02H 29 20 0.29 03H 29 27 0.26 02H 29 27 0.4 03H 29 31 0.31 05H 29 32 0.08 03H 29 32 0.21 05H 29 34 0.28 03H 29 35 0.17 04H SAI 29 37 0.44 03H 29 38 0.26 02H NDF 29 40 0.66 03H 29 41 0.17 02H 29 56 0.82 02H 29 57 0.51 02H SAI 30 16 0.1 04H 30 16 0.11 07H 30 20 0.26 04H 30 24 0.3 06H SAI 30 27 0.16 02H 30 32 0.27 03H 30 48 0.33 04H SAI 30 50 0.26 04H 30 55 0.1 03H 30 56 0.56 04H 30 59 0.19 04H 30 78 0.21 02H 30 78 0.23 04H 30 79 0.14 02H 30 81 0.12 03H 31 21 0.37 07H 31 23 0.65 02H 31 32 0.3 03H 31 32 0.41 05H 31 37 0.38 03H 31 39 0.13 02H 31 39 0.26 03H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-16 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 31 48 0.56 02H 31 52 0.22 02H 31 71 0.11 05H 31 75 0.15 04H 31 76 0.27 02H 31 78 0.44 02H 31 78 0.35 03H 32 16 0.18 08H 32 29 0.22 05H 32 31 0.15 02H SAI 32 53 0.54 02H 32 55 0.22 02H 32 55 0.22 05H 32 61 0.37 02H 32 61 0.44 05H 32 77 0.25 02H 33 29 0.05 02H 33 31 0.04 06H 33 31 0.22 07H 33 32 0.29 02H 33 37 0.17 04H 33 44 0.18 02H 33 60 0.07 03H 33 62 0.49 02H 33 73 0.56 07H 34 16 0.15 08H 34 18 0.31 08H 34 32 0.33 02H 34 35 0.15 03H 34 37 0.24 03H 34 48 0.45 02H 34 48 0.29 03H 34 48 0.17 04H 34 51 0.52 02H 34 51 0.38 03H 34 57 0.3 02H 35 40 0.06 02H 36 25 0.11 05H 36 42 0.18 03H 36 58 0.11 05H 37 24 0.07 05H 37 32 0.67 03H 37 57 0.19 02H 37 57 0.14 05H 38 35 0.14 02H 38 63 0.14 03H 39 31 0.19 05H 39 33 0.13 03H 40 31 0.06 05H 40 42 0.43 02H 41 31 0.23 05H 41 52 0.2 08C 41 68 0.36 04H 42 51 0.18 04H 44 48 0.37 02H 44 53 0.49 05H 45 36 0.64 08H 45 37 0.4 08H NDF 9 45 0.69 02H DEPLUG 17 25 0.76 02H NDF DEPLUG SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-17 Table A-2: SG-B 2R23 DSI Indications Comments Row Col Volts Location SAI/HAI MAI NDF PLUG DEPLUG 17 25 0.63 03H HAI DEPLUG 17 41 0.9 02H NDF DEPLUG 17 41 0.55 03H HAI DEPLUG 21 19 0.18 05H DEPLUG 25 72 0.23 04H DEPLUG SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-18 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG TOTAL 40 0 5 0 0 1 23 0.21 07C 2 78 0.45 03H 2 80 0.17 03H 2 85 0.27 03H 3 8 0.48 04H 3 9 0.16 04H 3 9 0.17 06H 3 12 0.25 07H 3 18 0.28 03H 3 35 0.17 05H 3 39 0.13 04H 3 39 0.48 07H 3 45 0.51 02H 3 58 0.38 02H 3 60 0.3 02H 3 60 0.43 03H 3 64 0.22 02H 3 64 0.45 03H 3 80 0.61 02H 3 90 0.32 06H 3 93 0.3 04H 3 94 0.46 04H 4 3 0.13 04H 4 11 0.32 02H 4 26 0.61 03H 4 28 0.39 06H NDF 4 33 0.66 02H SAI 4 33 0.82 04H SAI 4 39 0.41 07H 4 48 0.29 02H 4 49 0.47 03H 4 69 0.26 03H 4 76 0.22 03H 5 6 0.43 03H 5 6 0.11 04H 5 7 0.41 02H 5 7 0.83 03H 5 15 0.24 03H 5 15 0.65 04H SAI 5 18 0.42 02H 5 19 0.49 02H 5 19 0.24 03H 5 29 0.73 02H 5 29 0.18 03H 5 61 0.58 02H 5 62 0.49 02H 5 66 0.44 03H 5 70 0.56 05C 5 71 0.26 02H 5 76 0.29 03H 5 86 0.48 08H 5 89 0.61 02H 6 23 0.15 02H 6 30 0.28 02H 6 30 0.25 03H 6 54 0.61 03H 6 55 0.33 02H 6 63 0.38 02H 6 63 0.42 04H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-19 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 6 78 0.41 03H 6 84 0.2 03H 6 87 0.21 03H 6 92 0.24 04H 7 12 0.4 08C SAI 7 40 0.41 03H 7 40 0.31 04H 7 49 0.41 02H 7 49 0.3 03H 7 58 0.33 02H 7 67 0.37 02H 7 80 0.17 03H 8 2 0.37 08H 8 23 0.55 02H 8 24 0.42 02H 8 43 0.21 03H 8 63 0.22 06H 8 72 0.2 03H 8 84 0.23 03H 9 13 0.07 03H 9 20 0.35 04H 9 26 0.38 03H 9 30 0.31 02H 9 32 0.72 02H 9 35 0.52 02H 9 35 0.42 03H 9 37 0.37 02H 9 38 0.37 03H 9 39 0.29 05H 9 41 0.26 02H 9 44 0.21 03H 9 45 0.38 05H 9 45 0.24 06H 9 47 0.37 02H 9 54 0.75 02H 9 54 0.28 04H 9 62 0.14 04H 9 65 0.24 06H 9 74 0.25 04H 10 8 0.64 02H 10 9 0.16 03H 10 10 0.49 02H 10 10 0.27 03H 10 18 0.07 04H 10 24 0.24 03H 10 36 0.35 02H 10 37 0.68 02H 10 38 0.46 07H 10 43 0.17 02H 10 44 0.35 02H 10 51 1.03 02H NDF 10 51 0.19 03H 10 51 0.31 05H 10 54 0.55 02H 10 54 0.34 03H 10 72 0.29 02H 10 72 0.14 03H 10 76 0.1 04H 10 78 0.05 03H 11 7 0.49 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-20 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 11 9 0.58 03H 11 17 0.74 02H 11 36 1 02H SAI 11 49 0.57 02H 11 57 0.14 07C 11 62 0.34 03H 11 70 0.17 03H 11 72 0.23 03H 11 77 0.3 04H 11 77 0.17 05H 11 88 0.59 05H 12 9 0.32 02H 12 30 0.16 02H 12 35 0.09 04H 12 35 0.04 05H 12 55 0.47 02H NDF 12 70 0.25 02H 12 70 0.22 03H 12 83 0.11 03H 13 7 0.36 03H 13 32 0.08 02H 13 35 1.05 02H SAI 13 35 0.5 04H SAI 13 35 0.39 05H SAI 13 43 0.16 02H 13 43 0.33 03H 13 59 0.02 03H 13 62 0.25 04H 13 63 0.15 02H 13 64 0.45 02H 13 64 0.33 08H 14 29 0.15 04H SAI 14 38 0.23 02H 14 39 0.19 05H 14 50 0.42 02H 14 54 0.36 02H 14 59 0.16 03H 14 59 0.11 04H 14 59 0.11 06H 14 70 0.24 08H 15 5 1.44 04H NDF 15 14 0.15 03H 15 35 0.11 02H 15 35 0.51 03H 15 38 0.38 04H SAI 15 39 0.76 02H 15 39 0.32 03H 15 61 0.22 02H 15 62 0.09 02H 15 80 0.2 03H 15 87 0.3 03H 16 15 0.28 03H 16 17 0.2 02H 16 34 0.39 03H 16 45 0.98 06C SAI 16 46 0.59 02H 16 46 0.44 04H 16 55 0.32 06H 16 57 0.19 03H 16 63 0.11 02H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-21 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 16 73 0.29 02H 17 9 0.15 04H SAI 17 14 0.22 04H 17 17 0.13 02H 17 18 0.31 02H 17 24 0.1 04H 17 26 0.22 03H 17 35 0.76 03H SAI 17 38 0.33 02H 17 48 0.57 02H 17 49 0.28 02H 17 50 0.64 03H SAI 17 54 0.3 04H 17 61 0.84 02H 17 61 0.31 03H 17 63 0.31 02H 17 66 0.34 02H 17 67 0.49 02H 17 68 0.34 02H 18 5 0.2 03H 18 15 0.12 06H 18 47 0.58 03H 18 47 0.42 04H 18 48 0.63 02H 18 48 0.72 03H 18 48 0.39 04H 18 50 0.28 02H 18 51 0.59 02H 18 53 0.49 02H 18 54 0.43 02H 18 54 0.38 03H 18 55 0.58 02H 18 56 0.28 03H 18 59 0.36 03H 18 59 0.22 06H 18 61 0.26 04H 18 61 0.21 08H 18 62 0.32 02H 18 62 0.68 03H 18 62 0.3 04H 18 66 0.58 03H 18 67 0.52 02H 18 67 0.44 03H 18 73 0.13 03H 19 26 0.27 03H 19 29 0.41 02H 19 29 0.53 08H SAI 19 47 0.31 04H SAI 19 48 0.44 02H 19 48 0.64 03H 19 54 0.25 02H 19 57 0.34 04H 19 57 0.56 05H 19 65 0.21 05H 19 79 0.99 02H 19 82 0.31 02H 19 89 0.15 06H 20 21 0.25 04H SAI 20 75 0.57 02H 20 76 0.7 02H SAI SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-22 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 20 76 0.72 03H 20 78 0.36 04H SAI 20 85 0.2 03H 21 18 0.31 02H 21 18 0.41 03H 21 18 0.41 08H NDF 21 25 0.08 04H 21 62 0.26 02H 21 67 0.25 07H 22 18 0.33 02H 22 18 0.34 05H 22 20 0.61 02H 22 24 0.18 03H 22 33 0.24 02H 22 54 0.32 06H 22 61 0.25 03H 22 64 0.28 03H 22 75 0.31 04H SAI 22 77 0.24 03H 23 10 0.21 02H 23 28 0.4 03H 23 37 0.73 02H 23 39 0.16 02H 23 39 0.17 05H 23 42 0.24 02H 23 42 0.33 03H 23 69 0.14 03H 23 77 0.49 02H 23 77 0.17 03H 24 11 0.32 03H 24 34 0.58 02H SAI 24 34 0.32 04H 24 34 0.47 08H 24 48 0.31 03H 24 50 0.21 02H 24 56 0.29 03H 24 57 0.12 02H 24 61 0.38 02H 24 63 0.21 04H 24 79 1.07 02H SAI 25 17 0.19 03H 25 26 0.11 04H 25 31 0.53 02H 25 33 0.23 08H 25 34 0.63 02H 25 34 0.44 03H 25 34 0.45 05H 25 47 0.32 03H 25 47 0.19 08H 25 54 0.11 02H 25 60 0.4 02H 25 61 0.43 02H 25 61 0.41 05H 25 62 0.49 04H 25 63 0.38 04H 25 65 0.27 02H 25 65 0.39 05H 25 65 0.21 07H SAI 25 67 0.27 04H SAI 25 71 0.41 06H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-23 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 25 74 0.24 02H SAI 25 76 0.62 02H 25 76 0.31 05H 25 79 0.22 02H 26 24 0.02 06H 26 28 0.15 08H 26 38 0.12 05H 26 38 0.11 05H 26 39 0.27 05H 26 42 0.45 02H 26 44 0.31 06H 26 65 0.38 03H 26 70 0.58 03H 26 72 0.34 08H 27 20 0.48 02H 27 22 0.17 02H 27 24 0.08 04H 27 29 0.48 03H SAI 27 29 0.26 04H 27 31 0.97 02H 27 33 0.62 03H SAI 27 60 0.53 02H 27 69 0.3 02H 27 76 0.45 03H 27 79 0.21 02H 28 27 0.33 05H 28 35 0.76 02H 28 42 0.15 02H 28 42 0.12 04H 28 44 0.22 02H 28 44 0.15 03H 28 50 0.22 03H 28 70 0.17 08H 28 73 0.21 02H 28 73 0.19 03H 28 85 0.33 02H 29 11 0.37 05H 29 26 0.19 05H 29 28 0.5 02H SAI 29 29 0.47 03H 29 30 0.21 04H SAI 29 37 0.36 02H 29 38 0.13 05H 29 43 0.34 03H 29 47 0.23 02H 29 52 0.22 04H 29 57 0.1 05H 29 63 0.2 05H 30 12 0.12 03H 30 24 0.39 02H 30 25 0.12 04H 30 31 0.31 03H 30 31 0.24 04H 30 41 0.16 02H 30 60 0.34 02H 30 60 0.63 03H 30 60 0.29 04H 30 61 0.69 02H 30 61 0.49 04H SAI 30 61 0.21 06H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-24 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 30 62 0.26 04H 30 64 0.44 02H 30 64 0.35 04H SAI 30 65 0.21 04H SAI 30 66 0.31 04H 31 14 0.07 05H 31 17 0.09 04H 31 22 0.16 02H 31 29 0.43 04H 31 49 0.14 02H 31 60 0.19 02H 31 61 0.24 03H 31 61 0.31 04H 31 62 0.63 03H 31 64 0.41 04H SAI 31 66 0.68 02H 31 66 0.12 03H 31 66 0.14 04H 31 66 0.2 05H 31 69 0.25 03H 31 72 0.62 04H 31 75 0.28 02H SAI 31 77 0.24 06H 31 78 0.77 03H 31 78 0.82 04H 31 81 0.74 02H 31 81 0.54 03H 32 19 0.23 05H 32 25 0.23 03H 32 62 0.22 02H 32 63 0.33 03H SAI 32 63 0.26 04H 32 64 0.26 04H 32 65 0.53 02H SAI 32 66 0.24 02H 32 67 0.39 06H SAI 32 78 0.28 05H 32 79 0.52 02H SAI 33 34 0.17 06H 33 60 0.56 03H SAI 33 60 0.25 07H 33 60 0.17 08H 33 61 0.13 04H 33 75 0.32 05H 34 24 0.13 07H 34 39 0.18 05H 34 55 0.82 03H 34 58 0.65 02H 34 58 0.14 04H 34 58 0.26 05H 34 59 0.54 02H 35 22 0.11 02H 35 22 0.17 07H 35 26 0.42 05H 35 34 0.15 03H 35 34 0.18 04H 35 38 0.1 07H 35 53 0.24 06H 36 20 0.16 03H 36 26 0.54 05H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 A-25 Table A-3: SG-C 2R23 DSI Indications Comments Row Col Volts Location SAI MAI NDF PLUG DEPLUG 36 27 0.25 05H 36 53 0.4 02H SAI 37 26 0.11 05H 37 33 0.14 04H 37 35 0.15 03H 37 52 0.11 06H 38 42 0.19 05H 39 27 0.34 04H 40 25 0.08 03H 40 39 0.1 03H 40 53 0.32 04H 41 27 0.19 04H 41 44 0.41 04H 41 50 0.14 08H 41 63 0.53 02H 42 32 0.18 04H SG-CDMP-23-10 July 2023 Revision 1

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

SG-CDMP-23-10 Revision 1 Non-Proprietary Class 3

• • This page was added to the quality record by the PRIME system upon its validation and shall not be considered in the page numbering of this document.**

Approval Information Author Approval Krinock Mitchell Jul-31-2023 09:27:05 Verifier Approval Carpenter Brad Jul-31-2023 10:29:09 Manager Approval Chappo jr. Robert Jul-31-2023 11:05:48 Files approved on Jul-31-2023

• • • This record was final approved on 7/31/2023, 11:05:48 AM. (This statement was added by the PRIME system upon its validation)

Enclosure B L-23-168 Unit #2 - 2R23 Steam Generator F* (F Star) Report (11 pages follow)

ENERGY HARBOR NUCLEAR Programs Engineering Unit Site Engineering Department Beaver Valley Power Station Issue Date: July 14, 2023

Subject:

Unit #2 - 2R23 Steam Generator F* (F Star) Report

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT Technical Specification 5.6.6.2.4 requires that a report be submitted to the Nuclear Regulatory Commission (NRC) within 90 days after the initial entry into MODE 4 following an outage in which the F* (F Star) methodology was utilized during steam generator (SG) tube inspections. For the spring 2023 refueling outage (2R23), the initial entry into MODE 4 occurred on May 14, 2023.

Per Technical Specification 5.6.6.2.4, the following information is to be submitted to the NRC:

(a) Total number of indications, location of each indication, orientation of each indication, severity of each indication, and whether the indications initiated from the inside or outside surface. This information can be found in Tables 2RCS-SG21A, 2RCS-SG21B and 2RCS-SG21C.

(b) The cumulative number of indications detected in the tubesheet region as a function of elevation within the tubesheet. This information can be found in Attachment A: "Unit 2 - Cumulative Listing of Tubesheet Indications (All Outages)".

(c) The projected end-of-cycle accident-induced leakage from tubesheet indications. This information can be found in the right-hand column of Tables 2RCS-SG21A, 2RCS-SG21B and 2RCS-SG21C. It is also explained in Item 4 under Information for All Tables on Page 3.

Discussion:

During 2R23, the Plus Point probe was utilized to inspect the top of tubesheet (TTS) region in both the hot and cold legs. The 2R23 baseline inspection scope included 100 percent of the in-service hot leg tubes in all three SGs plus a twenty percent sample of the in-service cold leg tubes in 2RCS-SG21C.

All tubes that were de-plugged during 2R23 were also inspected at the cold leg tubesheet per the baseline requirements for tube recovery. It is noted that this baseline eddy current scope was expanded as described below. The inspection distance for the hot leg and cold leg was from 6.0 inches above the top of tubesheet to 3.0 inches below the top of tubesheet. This inspection distance bounds the required F* examination distance (that is, the expanded portion of the tube below the bottom of roll expansion transition) of 2.22 inches below the bottom of the roll expansion transition.

There are ten tubes located on the hot leg side of the SGs that have roll expansion transitions at lower than nominal elevations. The ten hot leg tubes with the deeper roll transition locations were inspected to a depth of at least 5.0 inches below the top of tubesheet to ensure the F* distance was adequately examined. On the cold leg side of the SGs, there are 12 tubes that have roll expansion transitions at lower than nominal elevations. These 12 tubes were included with the 2R23 special interest sample plan for cold leg tubesheet bulges and over-expansions.

The morphology for most of the indications being reported from the hot leg top of tubesheet region is believed to be outside diameter stress corrosion cracking (ODSCC). This is based on signal recognition and the location of the reported indications. Both axial and circumferentially orientated indications were observed. Circumferential indications located above the top of tubesheet remain bounded by the expansion transition.

None of the indications that were reported during the 2R23 SG examinations represented a (Cycle 24) leakage potential at postulated main steam line break (MSLB) conditions nor did the 2R23 indications challenge the structural integrity performance criteria.

2

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT The projected accident induced leakage from all combined sources (sleeves, plugs, indications left in-service under Generic Letter 95-05 and other degradation within the tube bundle) remains well below that allowed by the Technical Specifications.

During 2R23, a tube recovery program was conducted to improve the thermal performance of the SGs. A total of 77 tubes were de-plugged and returned to service. Many of these tubes were originally plugged for top of tubesheet indications, which can now be repaired with the sleeving process. For consistency, tubesheet indications from de-plugged tubes are not included in this F*

report. Any new or historical indications detected in the de-plugged tubes would not impact condition monitoring since these tubes were not in service throughout the previous operating cycle; thus, they are deemed not applicable to this F* report. Historical indications from de-plugged tubes would have already been accounted for in the cumulative listing of tubesheet indications. It is noted that the projected end-of-cycle accident-induced leakage from tubesheet indications includes the effect from tubes that have been returned to service (i.e, de-plugged) and repaired with a sleeve.

During the baseline Plus Point probe inspections of the cold leg top of tubesheet region of tubes that were de-plugged during 2R23, two indications of circumferential cracking at the cold leg tubesheet expansion transition were reported. The affected tubes were Row 19 Column 41 and Row 19 Column 44 in SG B. The tubes were originally plugged in 2R17 (2014) and 2R13 (2008), respectively, for circumferential ODSCC at the hot leg tubesheet expansion transition. All tubes that were de-plugged during 2R23 were inspected at the cold leg tubesheet per the baseline requirements for tube recovery.

Once these indications were found, the cold leg tubesheet eddy current scope was expanded to include all previously de-plugged tubes that were in-service through Cycle 23 as well as about 2100 in-service tubes within a critical area in each of the A and B SGs. For SG C, 33% of the tubes within the critical area were inspected during 2R23 as part of the routine cold leg tubesheet monitoring program and an additional 33% were inspected in the previous outage (2R22) also in SG C. No SCC indications were found in in-service tubes that had not previously been de-plugged in any of these inspections. The only SCC indications found in the cold leg had been contained to tubes that previously had been plugged. The only prior tube recovery campaign occurred in 2R22 in SG A and SG B, and no tube recovery campaigns have been done in SG C.

During the expansion scope, one additional tube, Row 27 Column 39 in SG A, was found with circumferential ODSCC at the cold leg tubesheet expansion transition of a previously plugged tube during the inspection of the critical area. This tube was de-plugged and returned to service in 2R22 with a sleeve installed at the hot leg tubesheet. Historical data review of the cold leg Plus Point probe data showed a small precursor signal at 2R22. The tube was originally plugged due to a circumferential ODSCC indication at the hot leg tubesheet in 2R13.

Based upon the extensive cold leg tubesheet inspection results of in-service tubes and of all previously plugged tubes, it was apparent that circumferential cracking at cold leg tubesheet locations is confined to previously plugged tubes. This is further supported by an evaluation of the conditions of a plugged tube given its lower temperature and the potential of surrounding active tubes to be locked at the carbon steel drilled hole support plates. Eddy current inspection results of the cold leg TSPs of the affected tubes showed heavy deposits at the TSPs. Locked TSPs had been experienced at other first generation SGs similar to the Model 51M SG design at BVPS-2. A simplistic stress analysis was completed that evaluated the axial tensile stress that could be applied at the top of the cold leg sheet in a plugged tube if the surrounding active tubes and the plugged tube became locked prior to the tube 3

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT being plugged. This evaluation concluded that due to the lower temperature of the plugged tube and the higher temperatures of the active tubes, the difference in thermal expansion could cause up to 2-times the axial tensile stress in the plugged tube than an active tube. Axial tensile stress can cause the initiation of circumferential cracking, along with environmental conditions (i.e., secondary side deposit and chemistry composition) and may override the beneficial effects of lower temperature.

The information provided on the following pages summarizes the degradation observed during the 2R23 top of tubesheet region examinations.

Information for all Tables:

1) Elevation column: TSH - Top of tubesheet (Hot Leg). TSC - Top-of-tubesheet (Cold Leg). 0.00" is located at the secondary side tubesheet face. A negative measurement (< 0.00) is the distance into the tubesheet from the secondary side face. A positive measurement (> 0.00") is above the secondary side tubesheet face.

2) Orientation column: SAI/MAI - Single or multiple axial indications; SCI/MCI - Single or multiple circumferential indications.

3) Severity columns: This data has been re-analyzed utilizing the Plus Point probe 300 kHz channel. The 300 kHz channel provides the most accurate sizing technique and is used for assessing the severity of the indications. The reported arc lengths are taken from the data resolution process. Profile analysis shows these measurements to be generally conservative.

4) Projected EOC Leakage column: Indications reported within the 3.0" (5.0" or lower for particular tube locations) inspection distance below the top-of-tubesheet were either removed from service via plugging or repaired with the Alloy 800 sleeve during 2R23. The projected end of cycle (EOC) accident induced leakage from indications that were removed from service via plugging is considered zero. See Note 1 after each table for the projected leakage information for tubes with Alloy 800 sleeves installed.

4

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21A Hot Leg Tubesheet:

There were 31 new indications in 31 tubes. 28 indications were located at or slightly below the top of tubesheet (27 were single circumferential ODSCC indications, and 1 was a single axial ODSCC indication). The remaining 3 indications were located above the top of tubesheet (1 was a single circumferential ODSCC indication, and 2 were single axial ODSCC indications).

Table 2RCS-SG21A Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

A 1 38 TSH -0.09 SCI 0.08 - 29.2 OD/SCC Zero A 3 15 TSH -0.03 SCI 0.09 - 152 OD/SCC See Note 1 A 3 54 TSH -0.01 SAI 0.16 0.07 - OD/SCC See Note 1 A 3 71 TSH -0.05 SCI 0.09 - 67.7 OD/SCC See Note 1 A 4 55 TSH -0.07 SCI 0.13 - 136.9 OD/SCC See Note 1 A 5 13 TSH -0.07 SCI 0.16 - 163.1 OD/SCC See Note 1 A 5 63 TSH -0.08 SCI 0.09 - 87.7 OD/SCC See Note 1 A 6 32 TSH 0.00 SCI 0.16 - 144.6 OD/SCC See Note 1 A 6 44 TSH -0.19 SCI 0.12 - 32 OD/SCC See Note 1 A 7 47 TSH -0.09 SCI 0.21 - 116 OD/SCC See Note 1 A 7 58 TSH -0.11 SCI 0.12 - 141.5 OD/SCC See Note 1 A 7 60 TSH -0.09 SCI 0.12 - 93.8 OD/SCC See Note 1 A 10 31 TSH -0.10 SCI 0.11 - 36.9 OD/SCC See Note 1 A 15 32 TSH 0.03 SAI 0.07 0.10 - OD/SCC See Note 1 A 16 27 TSH -0.20 SCI 0.13 - 175 OD/SCC See Note 1 A 17 34 TSH 0.01 SAI 0.09 0.10 - OD/SCC See Note 1 A 17 75 TSH -0.02 SCI 0.13 - 52.3 OD/SCC See Note 1 A 22 69 TSH -0.08 SCI 0.11 - 44.6 OD/SCC See Note 1 A 22 74 TSH -0.06 SCI 0.20 - 67.7 OD/SCC See Note 1 A 23 45 TSH -0.10 SCI 0.09 - 27.7 OD/SCC See Note 1 A 23 61 TSH 0.00 SCI 0.08 - 55.4 OD/SCC See Note 1 A 23 67 TSH -0.08 SCI 0.16 - 221 OD/SCC See Note 1 A 26 61 TSH -0.08 SCI 0.06 - 258 OD/SCC See Note 1 A 26 63 TSH 0.00 SCI 0.14 - 219 OD/SCC See Note 1 A 26 73 TSH -0.06 SCI 0.13 - 76.9 OD/SCC See Note 1 A 31 35 TSH -0.11 SCI 0.10 - 63.1 OD/SCC See Note 1 A 31 58 TSH -0.05 SCI 0.25 - 39 OD/SCC See Note 1 A 32 65 TSH 0.00 SCI 0.14 - 193 OD/SCC See Note 1 A 38 44 TSH 0.00 SCI 0.11 - 193 OD/SCC See Note 1 A 40 35 TSH -0.13 SCI 0.07 - 30.8 OD/SCC Zero A 40 47 TSH 0.01 SCI 0.08 - 101.5 OD/SCC Zero Note 1 - Per WCAP 15919 (R2), "SG Tube Repair for Westinghouse Designed Plants with 7/8" Inconel 600 Tubes Using Leak Limiting Alloy 800 Sleeves", the per sleeve leak rate at normal operating conditions is 0.000543 gallons per hour (gph) and at main steam line or feedwater line break conditions is 0.000863 gph. For 2RCS-SG21A which currently has 428 Alloy 800 tubesheet sleeves installed and in-service, this equates to 3.8734 x 10-3 gpm and 6.1561 x 10-3 gpm, respectively. It is noted that there is a population of tubes that were de-plugged, sleeved, and returned to service during 2R23. The calculated leakage includes the impact of those de-plugged and sleeved tubes.

5

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21A Cold Leg Tubesheet:

One tube was reported with a volumetric (VOL) indication at the TTS from the inspection program for historical possible loose part calls. Row 9 Column 42 was sized at 31% through wall and remains in-service. One tube was found with circumferential ODSCC at the cold leg tubesheet expansion transition of a previously plugged tube. Row 27 Column 39 was removed from service via plugging. Additional information regarding cold leg SCC is in the discussion section.

Table 2RCS-SG21A (Cont.)

Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

A 9 42 TSC 0.00 VOL 0.37 0.18 43.0 OD/Wear Zero A 27 39 TSC -0.11 SCI 0.06 - 29.0 OD/SCC Zero 6

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21B Hot Leg Tubesheet:

There were 20 new indications in 18 tubes. 19 indications were located at or slightly below the top of tubesheet (17 were single circumferential ODSCC indications, and 2 were single axial ODSCC indications).

The remaining 1 indication was located above the top of tubesheet and was a single circumferential ODSCC indication.

Table 2RCS-SG21B Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

B 1 60 TSH -0.15 SCI 0.13 - 107.7 OD/SCC Zero B 2 60 TSH -0.09 SAI 0.39 0.13 - OD/SCC Zero B 6 34 TSH -0.20 SCI 0.1 - 56 OD/SCC See Note 1 B 6 34 TSH -0.14 SCI 0.09 - 68 OD/SCC See Note 1 B 6 34 TSH -0.13 SCI 0.07 - 53 OD/SCC See Note 1 B 7 36 TSH -0.17 SCI 0.08 - 30.8 OD/SCC See Note 1 B 7 61 TSH -0.15 SCI 0.13 - 76.7 OD/SCC See Note 1 B 7 94 TSH -0.39 SAI 0.12 0.11 - OD/SCC Zero B 9 56 TSH 0.03 SCI 0.15 - 194 OD/SCC See Note 1 B 16 55 TSH -0.12 SCI 0.09 - 36 OD/SCC See Note 1 B 18 12 TSH -0.06 SCI 0.2 - 61.5 OD/SCC Zero B 18 28 TSH -0.06 SCI 0.11 - 90.8 OD/SCC See Note 1 B 19 56 TSH 0.00 SCI 0.09 - 73 OD/SCC See Note 1 B 20 39 TSH -0.05 SCI 0.16 - 36.9 OD/SCC See Note 1 B 20 67 TSH -0.11 SCI 0.08 - 65 OD/SCC See Note 1 B 20 72 TSH -0.07 SCI 0.11 - 172 OD/SCC See Note 1 B 29 59 TSH -0.06 SCI 0.11 - 220 OD/SCC See Note 1 B 30 71 TSH -0.07 SCI 0.08 - 46 OD/SCC See Note 1 B 31 28 TSH -0.07 SCI 0.14 - 70.7 OD/SCC See Note 1 B 35 50 TSH -0.12 SCI 0.11 - 100 OD/SCC See Note 1 Note 1 - Per WCAP 15919 (R2), "SG Tube Repair for Westinghouse Designed Plants with 7/8" Inconel 600 Tubes Using Leak Limiting Alloy 800 Sleeves", the per sleeve leak rate at normal operating conditions is 0.000543 gallons per hour (gph) and at main steam line or feedwater line break conditions is 0.000863 gph. For 2RCS-SG21B which currently has 283 Alloy 800 tubesheet sleeves installed and in-service, this equates to 2.5612 x 10-3 gpm and 4.0705 x 10-3 gpm, respectively. It is noted that there is a population of tubes that were de-plugged, sleeved, and returned to service during 2R23. The calculated leakage includes the impact of those de-plugged and sleeved tubes.

7

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21B Cold Leg Tubesheet:

One tube was reported with a ding with possible indication (DNI) signal above the TTS from the full length bobbin coil program. The DNI signal in Row 9 Column 80 was re-examined with the Plus Point probe and no degradation was reported. Row 9 Column 80 remains in-service. One tube was reported with 2 volumetric (VOL) indications above the TTS from the full length bobbin coil program. The VOL indications in Row 19 Column 83 were sized at 12% and 11% through wall and remain in-service. One tube was reported with a volumetric (VOL) indication above the TTS from the inspection program for historical possible loose part calls.

Row 36 Column 27 was re-inspected with a Plus Point probe and sized at 12% through wall. Row 36 Column 27 remains in-service.

Table 2RCS-SG21B (Cont.)

Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

B 9 80 TSC 1.62 DNI 0.32 - - OD Zero B 19 41 TSC -0.19 SCI 0.09 - 135 OD/SCC Zero - Note 1 B 19 44 TSC -0.16 SCI 0.11 - 112 OD/SCC Zero - Note 1 TSC 0.37 VOL 0.09 0.16 49 OD/Wear Zero B 19 83 TSC 1.35 VOL 0.08 0.16 45 OD/Wear Zero B 36 27 TSC 0.14 VOL 0.08 0.22 49 OD/Wear Zero Note 1 - Two tubes were found with circumferential ODSCC at the cold leg tubesheet expansion transition following plug removal in 2R23. Following discovery of the indications, the two tubes were re-plugged during 2R23. The two indications are listed in this table for information only since they were not in-service during the previous cycle and were re-plugged.

Additional information regarding cold leg SCC is in the discussion section.

8

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21C Hot Leg Tubesheet:

There were 7 new indications in 7 tubes. 6 indications were located at or slightly below the top of tubesheet (5 were single circumferential ODSCC indications, and 1 was a single axial ODSCC indication). The remaining 1 indication was located above the top of tubesheet and was a single circumferential ODSCC indication.

Table 2RCS-SG21C Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

C 4 52 TSH 0.00 SCI 0.07 - 35.4 OD/SCC See Note 1 C 6 70 TSH -0.09 SCI 0.15 - 124.6 OD/SCC See Note 1 C 7 56 TSH -0.01 SAI 0.12 0.15 - OD/SCC See Note 1 C 9 52 TSH 0.00 SCI 0.11 - 80 OD/SCC See Note 1 C 30 49 TSH -0.08 SCI 0.12 - 64.6 OD/SCC See Note 1 C 33 55 TSH -0.10 SCI 0.07 - 81.5 OD/SCC See Note 1 C 37 53 TSH 0.01 SCI 0.11 - 232 OD/SCC See Note 1 Note 1 - Per WCAP 15919 (R2), "SG Tube Repair for Westinghouse Designed Plants with 7/8" Inconel 600 Tubes Using Leak Limiting Alloy 800 Sleeves", the per sleeve leak rate at normal operating conditions is 0.000543 gallons per hour (gph) and at main steam line or feedwater line break conditions is 0.000863 gph. For 2RCS-SG21C which currently has 94 Alloy 800 tubesheet sleeves installed and in-service, this equates to 8.5070 x 10-4 gpm and 1.3520 x 10-3 gpm, respectively.

9

UNIT #2 - 2R23 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21C Cold Leg Tubesheet:

A twenty percent sample of the in-service cold leg tubes in 2RCS-SG21C was performed from 6 inches above to 3 inches below the TTS. One tube with a roll expansion greater than 0.75 inches below the top of tubesheet was included in the sample. This tube was tested to a depth of 6 inches below the TTS to ensure the F*

inspection criteria was met. No indications were detected during the cold leg twenty percent sample inspection in 2RCS-SG21C; however, one tube was reported with a volumetric (VOL) indication at the TTS from the inspection program for historical possible loose part calls. Row 24 Column 84 was sized at 31% through wall and remains in-service. One tube was reported with a distorted tubesheet signal with possible indication (DTI) from the full length bobbin coil program. This tube was inspected with a Plus Point probe and no degradation was reported. Row 26 Column 26 remains in-service.

Table 2RCS-SG21C (Cont.)

Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

C 24 84 TSC 0.00 VOL 0.35 0.28 46 OD/Wear Zero C 26 26 TSC -5.03 DTI 6.32 - - OD Zero 10

Attachment A Unit 2 - Cumulative Listing of Tubesheet Indications (All Outages)

(Updated through 2R23) 11