Text

Steam Generator Inspection Reports - Spring 2020 Refueling Outage
	ML20211L853
Person / Time
Site:	Beaver Valley
Issue date:	07/28/2020
From:	Penfield R; Energy Harbor Nuclear Corp
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	L-20-156
	Download: ML20211L853 (96)
	v • d • e

energy Energy Harbor Nuclear Corp.

harbor Beaver Valley Power Station P.O. Box 4 Shippingport, PA 15077 Rod L. Penfield 724-682-5234 Site Vice President, Beaver Valley Nuclear July 28, 2020 L-20-156 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Beaver Valley Power Station, Unit No. 2 Docket No. 50-412, License No. NPF-73 Steam Generator Inspection Reports - Spring 2020 Refueling Outage In accordance with Beaver Valley Power Station, Unit No. 2, Technical Specifications 5.6.6.2.2 and 5.6.6.2.41 Energy Harbor Nuclear Corp. hereby submits two reports containing steam generator inspection results. The enclosed reports provide information required by the technical specifications that was obtained during the spring 2020 refueling outage inspections. No steam generator tube intersections were removed during the inspections, and therefore, metallurgical examinations were not performed.

There are no regulatory commitments contained in this submittal. If there are any questions or if additional information is required, please contact Mr. Phil H. Lashley, Manager - Fleet Licensing, at (330) 696-7208.

Enclosures:

A. Beaver Valley Unit 2 Refueling Outage 21 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report, Revision 0 B. Unit #2 - 2R21 Steam Generator F* (F Star) Report cc: NRC Region I Administrator NRC Resident Inspector NRR Project Manager Director BRP/DEP Site BRP/DEP Representative

Enclosure A L-20-156 Beaver Valley Unit 2 Refueling Outage 21 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report, Revision 0 (83 pages follow)

Westinghouse Non-Proprietary Class 3 SG-CDMP-20-15 July 2020 Revision 0 Beaver Valley Unit 2 Refueling Outage 21 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report

@ Westinghouse

- - This record was final approved on 7/10/2020 U:IS :4~ PM . (This statement was added by the PRIME system upon its validation)

WESTINGHOUSE NON-PROPRIETARY CLASS 3 SG-CDMP-20-15 Revision 0 Beaver Valley Unit 2 Refueling Outage 21 Generic Letter 95-05 Voltage-Based Alternate Repair Criteria Final Report Timothy L. Norman*, Principal Engineer Robotics and Tooling July 2020 Verifier: Bradley T. Carpenter *, Principal Engineer Component Design and Management Programs Approved: Michael E. Bradley*, Manager Component Design and Management Programs Owner Accepted: ifJ;((t1/2~

. ert1, Strategic 07/'.o/2:°2..0

m eermg

Electronically approved records are authenticated in the Electronic Document Management System.

Westinghouse Electric Company LLC P.O.Box 158 Madison, PA 15663

- - This record was final approved on 7/10/2020 3:08:4!?1 PM. (This statement was added by the PRIME system upon its validation)

ii RECORD OF REVISIONS Revision Date Description See 0 Original EDMS SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

iii TABLE OF CONTENTS RECORD OF REVISIONS ............................................................................................................ ii TABLE OF CONTENTS............................................................................................................... iii LIST OF TABLES ......................................................................................................................... iv LIST OF FIGURES .........................................................................................................................v 1 INTRODUCTION ............................................................................................................ 1-1 2

SUMMARY

AND CONCLUSIONS ................................................................................ 2-1 3 2R21 INSPECTION RESULTS AND VOLTAGE GROWTH RATES............................. 3-1 3.1 2R21 Inspection Results ............................................................................................. 3-1 3.2 Voltage Growth Rates ................................................................................................. 3-4 3.3 Probe Wear Criteria..................................................................................................... 3-5 3.4 NDE Uncertainties ...................................................................................................... 3-5 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 (POD).................................................................................. 6-2 6.3 Limiting Growth Rate Distribution ............................................................................ 6-2 6.4 Cycle Operating Period .............................................................................................. 6-2 6.5 Projected EOC-22 Voltage Distribution..................................................................... 6-2 7 SLB LEAK RATE AND TUBE BURST PROBABILITY ANALYSES ........................... 7-1 7.1 2R21 Condition Monitoring Leak Rate and Tube Burst Probability........................ 7-1 7.2 Cycle 22 Operational Assessment Leak Rate and Tube Burst Probability .............. 7-1 8 REFERENCES ................................................................................................................. 8-1 APPENDIX A ............................................................................................................................. A-1 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

iv LIST OF TABLES Table 3-1 2R21 RPC Examinations due to Bobbin Calls .................................................... 3-3 Table 3-2 2R21 DSI Voltage Distribution for SG-A ............................................................ 3-6 Table 3-3 2R21 DSI Voltage Distribution for SG-B ............................................................ 3-7 Table 3-4 2R21 DSI Voltage Distribution for SG-C ............................................................ 3-8 Table 3-5 Indication Distribution as Function of Tube Support Plate ................................. 3-9 Table 3-6 Voltage Growth Cumulative Distribution .......................................................... 3-10 Table 3-7 Growth Rate as a Function of BOC Voltage Range ........................................... 3-11 Table 3-8 Indications with the Largest Growth in Cycle 21 .............................................. 3-12 Table 4-1 7/8-Inch Tube Burst Pressure vs. Bobbin Amplitude Correlation ....................... 4-3 Table 4-2 Tube Leak Rate vs. Bobbin Amplitude Correlation Parameters .......................... 4-4 Table 4-3 7/8-Inch Tube Probability of Leak Correlation Parameters ................................. 4-5 Table 6-1 Predicted Voltage Distribution at EOC-22 .......................................................... 6-3 Table 7-1 Condition Monitoring Leak and Burst Results for 2R21 ..................................... 7-2 Table 7-2 Operational Assessment Leak and Burst Results for EOC-22 (POD = 0.6) ........ 7-2 Table A-1 SG-A 2R21 DSI Indications................................................................................ A-1 Table A-2 SG-B 2R21 DSI Indications.............................................................................. A-12 Table A-3 SG-C 2R21 DSI Indications.............................................................................. A-25 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

v LIST OF FIGURES Figure 3-1 Voltage Distribution in SG-A (Measured vs. Predicted) .................................... 3-13 Figure 3-2 Voltage Distribution in SG-B (Measured vs. Predicted) .................................... 3-14 Figure 3-3 Voltage Distribution in SG-C (Measured vs. Predicted) .................................... 3-15 Figure 3-4 Number of Measured Bobbin DSI as a Function of TSP................................... 3-16 Figure 3-5 Voltage Growth / EFPY in SG-A during Cycles 20 and 21 ............................... 3-17 Figure 3-6 Voltage Growth / EFPY in SG-B during Cycles 20 and 21 ............................... 3-18 Figure 3-7 Voltage Growth / EFPY in SG-C during Cycles 20 and 21 ............................... 3-19 Figure 3-8 Voltage Growth / EFPY in SGs A, B and Overall Bounding Growth Curve ..... 3-20 Figure 3-9 Upper 5% of Growth/EFPY for SG-A ............................................................... 3-21 Figure 3-10 Upper 5% of Growth/EFPY for SG-B ............................................................... 3-22 Figure 3-11 Upper 5% of Growth/EFPY for SG-C ............................................................... 3-23 Figure 3-12 Cycle 21 Voltage Growth vs. BOC Voltage ....................................................... 3-24 Figure 6-1 SG-A Predicted Voltage Distribution at EOC-22 ................................................. 6-4 Figure 6-2 SG-B Predicted Voltage Distribution at EOC-22 ................................................. 6-5 Figure 6-3 SG-C Predicted Voltage Distribution at EOC-22 ................................................. 6-6 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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 2020, 2R21 outage, together with postulated Steam Line Break (SLB) leak rate and tube burst probability analyses. The 2R21 outage represents the sixth 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 steam line break (SLB) leak rates and tube burst probabilities calculated using the end-of-cycle (EOC) conditions for the recently completed Cycle 21, representing a Condition Monitoring (CM) assessment of bobbin coil signal amplitudes for observed possible indications. In addition, a projection of EOC-21 bobbin coil voltage distributions, as well as the associated SG tube leak rates and burst probabilities through EOC-22 conditions, is provided.

The condition monitoring analysis at EOC-21 was carried out using the actual bobbin coil voltage distributions measured during the 2R21 outage. These results show that the 2R21 condition monitoring 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 2R20 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-22) based on the 2.0 volt repair criteria for 7/8-inch diameter tubes. These analyses utilized bobbin voltage distributions measured during the recent (2R21) inspection and a growth rate distribution bounding the last two inspections (2R20 and 2R21). Leak and burst analyses for the operational assessment were performed using the Reference 4 default value primary-to-secondary pressure differential of 2560 psi. The Cycle 22 operational assessment predicts that SG-B will be the limiting SG for projected leakage.

With a Cycle 22 period of operation estimated at 526 effective full power days (EFPD), the limiting EOC-22 maximum leak rate for SG-B is projected to be 0.207 gpm (room temperature), which is well below the allowable limit of 2.2 gpm for the faulted SG. The corresponding maximum tube burst probability for the limiting SG (SG-C) of 3.61 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-22.

1

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

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

2-1 2

SUMMARY

AND CONCLUSIONS A total of 1292 distorted support indications (DSI) in all three SGs combined were reported during the Beaver Valley Power Station Unit 2 (BVPS2) 2R21 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 2R21 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 one volt were inspected with a +POINT probe.

The maximum bobbin coil voltage indication in all three SGs was 1.61 volts on R7 C18 at the 02H tube support plate in SG-A.

SLB leak rate and tube burst probability analyses were performed using the actual 2R21 bobbin voltage distributions (condition monitoring analysis) as well as the projected EOC-22 bobbin voltage distributions (operational assessment). The SLB leak rates from the condition monitoring analysis show significant margins relative to the faulted SG allowable limit of 2.2 gpm (room temperature), Reference 11. The corresponding condition monitoring tube burst probability values are well below the allowable limit of 1.0 x 10-2.

At 2R21, the largest SLB leak rate in the condition monitoring analysis is calculated for SG-B, with a magnitude of 0.052 gpm, which is well below the allowable SLB leakage limit of 2.2 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 condition monitoring analysis, 1.44 10-5 calculated for SG-C, is well below the NRC reporting guideline of 1.0 x 10-2. Thus, the condition monitoring results are well within the allowable limit/reporting guideline.

SLB leak rate and tube burst probability projections at the EOC-22 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 22 operational assessment were performed using the Reference 4 default primary-to-secondary pressure differential of 2560 psi. SG-B is predicted to be the limiting SG for leakage while SG-A is predicted to be the limited SG for probability of burst. For a projected Cycle 22 duration of 526 EFPD, the EOC-22 leak rate projected for SG-B using the GL 95-05 constant probability of detection (POD) of 0.6 is 0.207 gpm (at room temperature), which is less than the current limit of 2.2 gpm in the faulted SG. This leak rate projection utilized the leak rate calculation methodology of References 5 and 6.

The limiting EOC-22 burst probability of 3.61 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 22.

It should be noted that the 2R21 final eddy current database retained several duplicate DSI indications (eleven in SG-A and five in SG-B). Preliminary evaluations documented in Reference 15 included these indications, but they were removed for the condition monitoring and operational assessment evaluations performed within this report.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-1 3 2R21 INSPECTION RESULTS AND VOLTAGE GROWTH RATES 3.1 2R21 Inspection Results For outages prior to 2R16, the alternate repair criterion per GL 95-05 had been approved for BVPS2 but was not implemented. First Energy Nuclear Operating Company (FENOC), now 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 2R21 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 groove 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 2R21 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) with +POINT probe voltage as follows:

SG Row-Col-Location Characterization +POINT Probe Voltage A R4C60 02H NDF 0.37 A R3C59 02H NDF 0.46 A R4C60 06H NDF 0.34 B R4C59 02H NDF 0.69 B R3C65 03H NDF 0.85 B R4C59 03H NDF 1.09 B R4C48 03H NDF 0.66 B R4C36 04H SAI 0.72 C R4C33 02H SAI 0.82 C R4C33 04H SAI 0.51 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-2 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 16 provides the evaluation for the equivalency basis of using the 0.630 wide-groove probe during 2R21.

To assess depth growth, the 2R20 DSIs with +POINT probe confirmation were also inspected at 2R21, 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) is only 0.35 volt (SG-A at R31 C74 02H), which represents a depth of 60.5% through-wall (TW) using the sizing protocol of Electric Power Research Institute (EPRI) Examination Technique Specification Sheet (ETSS) ETSS I28431. This particular indication was reported at 0.44 volt by

+POINT probe during 2R20, which represents a 64% TW depth per ETSS I28431. Long term trending of the Unit 2 DSI population has shown a limited growth potential. For Cycles 10 through 21, 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-21 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 2R21 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 3-1, 1246 total DNI indications were tested using a rotating pancake coil (RPC) probe. Four tube locations where DNI signals were identified by bobbin probe also had SAI indications confirmed by RPC probe.

These locations were all in SG-C (R19C47 04H, R13C35 05H, R16C45 06C and R25C65 07H).

DSI indications were confirmed at each of these locations, with the exception of the DNI reported at R16C45 06C, where a DSI voltage had to be imputed from a DSI/SAI voltage correlation developed. As a result, all four of these locations were included in the GL 95-05 CM and OA evaluations.

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. No axial PWSCC or SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-3 circumferential stress corrosion cracking (SCC) was reported at any TSP intersection. The

+POINT probe inspection program for dents, DNIs, and SPRs was extensive. The following table provides the number of +POINT probe examinations performed at TSP intersections as a result of these program requirements during 2R21.

Table 3-1 2R21 RPC Examinations due to Bobbin Calls DNI SPR SG >5V Dents RPC RPC Total Total Tested Tested A 18 597 597 527 165 B 36 200 200 258 86 C 14 449 449 210 58 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.

Table 3-2, Table 3-3 and Table 3-4 present the 2R21 bobbin voltage data for the TSP intersections in the three SGs with distorted support indications (DSIs). A total of 1292 DSI indications at TSP locations were detected in all three SGs combined, of which only 21 indications had amplitudes greater than 1.0 volt and one indication 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 2R21, 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 2R20 to 2R21, the following observations were made:

- There were 133 new DSI indications in 2R21 o 43 in SG-A o 48 in SG-B o 42 in SG-C

- There were eight new SAI/MAI indications confirmed by +POINT probe in 2R21.

o One (1) SAI in SG-A o Three (3) SAI in SG-B o Three (3) SAI in SG-C o One (1) MAI in SG-B Table 3-2, Table 3-3 and Table 3-4 tabulate the number of field bobbin indications, the number of those indications that were +POINT probe RPC inspected, the number of +POINT probe RPC confirmed indications, and the number of indications removed from service. No tubes were SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-4 deplugged in the current inspection with the intent of returning the tubes to service after inspection in accordance with the alternate repair criteria. The distribution of 2R21 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 2R21 indications as a function of support plate location is summarized in Table 3-5 and shown in Figure 3-4. The data show a strong predisposition of ODSCC to occur in the first few hot leg TSPs although the mechanism extended to higher TSPs. Only 37 indications were detected on the cold leg side; 19 of these exceeded 0.5 volt, but do not exceed 0.75 volt; 10 of these exceeded 0.75 volt but do not exceed 1.0 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 BVPS 2R21 outage in the form of tables (Table A-1, Table A-2, and Table A-3), whether axial ODSCC was confirmed (SAI/MAI in Comment column), whether the tube containing the indication(s) was plugged (Comment column), and whether the indication was tested and no defect was found (NDF in Comment column).

It should be noted that the 2R21 final eddy current database retained several duplicate DSI indications (eleven in SG-A and five in SG-B). Preliminary evaluations documented in Reference 15 included these indications, but they were removed for the condition monitoring and operational assessment evaluations performed within this report.

3.2 Voltage Growth Rates For projection of leak rates and tube burst probabilities at EOC-22, voltage growth rates were developed from the 2R20 and 2R21 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 3-5 shows a distribution of growth as a function of TSP number.

Table 3-6 shows the frequency and cumulative probability distribution of growth as a function of voltage change in each BVPS2 steam generator during Cycle 21 on a per 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 21 are given in Table 3-7. The average growth rates over the entire voltage range are negative indicating essentially no overall voltage growth. The Cycle 21 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 during 2R21 and during 2R20 vary in each SG. The SG-A and SG-B average growth is slightly higher in 2R21 and notably higher in the upper tail. The SG-C average growth is slightly higher in 2R21, and notably lower in the upper tail. The growth figures also include curves which bound the growth observed during both Cycle 20 and Cycle 21 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.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-5 Table 3-8 lists the top 21 indications based on the Cycle 21 growth rate in descending order. The average growth rates over the entire voltage range for Cycle 21 are mostly negative (Table 3-5) indicating essentially no voltage growth, but Table 3-8 shows that in cases of positive growth rates, that Cycle 21 had only modest growth. The growth during Cycle 21 had one indication over 1.0 volt/EFPY, only five indications greater than 0.5 volt/EFPY and under 1.0 volt/EFPY, and fifteen indications 0.5 volt/EFPY or less.

To determine if BVPS2 growth rates exhibited a potential dependency on the BOC voltage, the growth rate data for Cycle 21 was plotted against BOC voltage, and the resulting plot is shown in Figure 3-12. The Cycle 21 growth data do 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 operational assessment.

3.3 Probe Wear Criteria The probe wear criterion approved by the NRC (Reference 8) was applied during the 2R21 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 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 had a measured bobbin voltage that exceeded the 1.5 volt criteria.

The location that this occurred is at R7C18 02H. The IQDA was consulted regarding the condition of the probe that inspected SG-A Tube R7C18 and detected the DSI at the 02H support plate. It was confirmed that the probe satisfied the wear limit criteria that would otherwise categorize it as a worn probe. Therefore, no re-tests were required due to probe wear applicable to GL 95-05.

3.4 NDE Uncertainties The NDE uncertainties applied for the Cycle 21 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 nondestructive examination (NDE) uncertainty distributions are included in the Monte Carlo analyses for SLB leak rates and tube burst probabilities based on the 2R21 actual voltage distributions as well as for the EOC-22 projections.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-6 Table 3-2 2R21 DSI Voltage Distribution for SG-A

+POINT Not

+POINT Probe Returned Voltage Number of +POINT Probe Tested Plugged to Bin Indications Probe Confirmed But Not Service Tested Confirmed 0.1 20 0 0 20 0 20 0.2 110 1 3 106 0 110 0.3 93 9 2 82 0 93 0.4 67 2 6 59 0 67 0.5 38 3 1 34 0 38 0.6 24 2 2 20 0 24 0.7 15 1 2 12 0 15 0.8 9 0 2 7 0 9 0.9 3 1 0 2 0 3 1 5 1 0 4 0 5 1.1 1 0 1 0 0 1 1.2 1 1 0 0 0 1 1.3 1 0 1 0 1 0 1.4 1 0 1 0 0 1 1.5 1 0 1 0 0 1 1.6 0 0 0 0 0 0 1.7 1 0 1 0 0 1 Total 390 22 23 345 1 389 Average voltage = 0.328 volt SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-7 Table 3-3 2R21 DSI Voltage Distribution for SG-B

+POINT Not

+POINT Probe Returned Voltage Number of +POINT Probe Tested Plugged to Bin Indications Probe Confirmed But Not Service Tested Confirmed 0.1 34 0 0 34 0 34 0.2 123 4 2 117 0 123 0.3 118 5 3 110 0 118 0.4 78 3 2 73 0 78 0.5 64 3 2 59 0 64 0.6 28 1 1 26 0 28 0.7 24 1 3 20 0 24 0.8 9 3 0 6 0 9 0.9 5 0 1 4 0 5 1 2 0 0 2 0 2 1.1 6 1 5 0 0 6 1.2 4 0 4 0 0 4 Total 495 21 23 451 0 495 Average voltage = 0.332 volt SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-8 Table 3-4 2R21 DSI Voltage Distribution for SG-C

+POINT Not

+POINT Probe Returned Voltage Number of +POINT Probe Tested Plugged to Bin Indications Probe Confirmed But Not Service Tested Confirmed 0.1 13 0 0 13 0 13 0.2 77 1 0 76 0 77 0.3 106 6 0 100 0 106 0.4 77 6 2 69 0 77 0.5 50 7 0 43 0 50 0.6 36 2 1 33 0 36 0.7 21 1 0 20 0 21 0.8 11 0 0 11 0 11 0.9 6 3 0 3 0 6 1 5 1 0 4 0 5 1.1 3 1 2 0 0 3 1.2 1 0 1 0 0 1 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 407 28 7 372 0 407 Average voltage = 0.362 volt SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-9 Table 3-5 Indication Distribution as Function of Tube Support Plate SG-A SG-B Number of Max. Average Largest Average Number of Max. Average Largest Average TSP Indications Volts Volts Growth, Volts Growth, Volts TSP Indications Volts Volts Growth, Volts Growth, Volts 02H 134 1.61 0.357 1.35 0.056 02H 192 1.17 0.347 0.44 -0.030 03H 95 1.41 0.352 0.37 0.013 03H 145 1.17 0.362 0.86 -0.006 04H 61 1.32 0.313 0.57 0.047 04H 69 1.09 0.281 0.30 -0.011 05H 50 0.68 0.287 0.14 -0.025 05H 44 1.04 0.281 0.12 -0.006 06H 14 0.60 0.290 0.35 0.069 06H 8 0.40 0.228 0.08 -0.071 07H 7 0.75 0.340 0.06 -0.020 07H 12 0.41 0.263 0.08 -0.016 08H 12 0.66 0.275 0.24 0.036 08H 10 0.66 0.319 0.16 0.006 02C 0 -- -- -- -- 02C 1 0.52 0.520 -- --

03C 0 -- -- -- -- 03C 1 0.29 0.290 0.05 0.050 04C 0 -- -- -- -- 04C 2 0.57 0.340 -0.01 -0.010 05C 4 0.25 0.190 0.03 -0.005 05C 3 0.42 0.273 -0.07 -0.070 06C 3 0.30 0.183 0.06 0.017 06C 3 0.32 0.277 0.01 -0.080 07C 3 0.37 0.243 -0.01 -0.010 07C 3 0.64 0.480 0.10 0.055 08C 7 0.35 0.184 0.11 0.058 08C 2 0.42 0.315 0.01 0.000 Total 390 Total 495 SG-C Composite Number of Max. Average Largest Average Number of Max. Average Largest Average TSP TSP Indications Volts Volts Growth, Volts Growth, Volts Indications Volts Volts Growth, Volts Growth, Volts 02H 144 1.04 0.421 0.38 -0.006 02H 470 1.61 0.373 1.35 0.002 03H 112 1.12 0.377 0.37 -0.023 03H 352 1.41 0.364 0.86 -0.006 04H 67 1.45 0.301 0.35 0.010 04H 197 1.45 0.298 0.57 0.013 05H 36 0.71 0.286 0.10 0.002 05H 130 1.04 0.285 0.14 -0.012 06H 21 0.94 0.260 0.12 0.005 06H 43 0.94 0.264 0.35 0.013 07H 10 0.56 0.291 0.11 -0.006 07H 29 0.75 0.291 0.11 -0.013 08H 13 0.68 0.282 0.05 -0.024 08H 35 0.68 0.290 0.24 0.010 02C 0 0.00 0.000 0.00 0.000 02C 1 0.52 0.520 -- --

03C 0 0.00 0.000 0.00 0.000 03C 1 0.29 0.290 0.05 0.050 04C 0 0.00 0.000 0.00 0.000 04C 2 0.57 0.340 -0.01 -0.010 05C 1 0.54 0.540 0.03 0.030 05C 8 0.54 0.265 0.03 -0.013 06C 0 0.00 0.000 0.00 0.000 06C 6 0.32 0.230 0.06 -0.032 07C 2 0.33 0.295 -0.01 -0.010 07C 8 0.64 0.345 0.10 0.023 08C 1 0.82 0.820 0.39 0.390 08C 10 0.82 0.274 0.39 0.089 Total 407 Total 1292 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-10 Table 3-6 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-21 minus Probability Probability Probability Probability Indications Indications Indications Indications EOC-20 Distribution Distribution Distribution Distribution V<-0.79 0 0.0 1 0.002237 0 0.0 1 0.002237

-0.79<V-0.7 0 0.0 1 0.004474 0 0.0 1 0.001663

-0.69<V-0.6 1 0.002882 0 0.0 0 0.0 1 0.002494

-0.59<V-0.5 0 0.0 2 0.008949 1 0.002445 3 0.005819

-0.49<V-0.4 2 0.008646 4 0.017897 0 0.0 6 0.010806

-0.39<V-0.3 1 0.011527 6 0.031320 3 0.009780 10 0.019950

-0.29<V-0.2 4 0.023055 21 0.078300 11 0.036675 36 0.049875

-0.19<V-0.1 21 0.083573 40 0.167785 35 0.122249 96 0.131338

-0.09 <V0.0 132 0.463977 191 0.595078 148 0.484108 471 0.526185 0.01<V0.1 131 0.841499 129 0.883669 132 0.806846 392 0.856193 0.11<V0.2 31 0.930836 33 0.957494 45 0.916870 109 0.948462 0.21<V0.3 13 0.968300 15 0.991051 24 0.975550 52 0.992519 0.31<V0.4 4 0.979827 1 0.993289 7 0.992665 12 0.000000 0.41<V0.5 3 0.988473 1 0.995526 1 0.995110 5 0.000000 0.51<V0.6 1 0.991354 1 0.997763 1 0.997555 3 0.000000 0.61<V0.7 1 0.994236 0 0.0 0 0.0 1 0.000000 0.71<V0.8 1 0.997118 0 0.0 0 0.0 1 0.000000 0.81<V0.9 0 0.0 1 1.0 1 1.0 2 0.000000 V>0.9 1 1.0 0 0.0 0 0.0 1 1.0 Number of Indications with 347 447 409 1203 Growth Average 16.5% 4.5% 3.9% N/A Percentage Growth SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-11 Table 3-7 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 21 Growth Growth EFPY Composite Entire Range 1158 0.344 0.000 0.000 Vboc<0.75 1098 0.310 0.008 0.006 Vboc>0.75 60 0.969 -0.142 -0.102 SG-A Entire Range 347 0.309 0.031 0.022 Vboc<0.75 331 0.279 0.036 0.026 Vboc>0.75 16 0.948 -0.071 -0.051 SG-B Entire Range 447 0.348 -0.018 -0.013 Vboc<0.75 421 0.311 -0.006 -0.005 Vboc>0.75 26 0.955 -0.201 -0.145 SG-C Entire Range 364 0.372 -0.006 -0.005 Vboc<0.75 346 0.339 -0.001 0.000 Vboc>0.75 18 1.007 -0.118 -0.085 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-12 Table 3-8 Indications with the Largest Growth in Cycle 21 C21 +POINT TSP EOC-20 EOC-21 SG Row Column Growth Probe No. Volts Volts Volts Tested A 7 18 02H 0.26 1.61 1.35 Yes (NDF)

B 4 59 03H 0.23 1.09 0.86 Yes (NDF)

A 17 46 02H 0.54 1.28 0.74 Yes (NDF)

A 20 22 02H 0.30 0.91 0.61 No A 28 26 04H 0.26 0.83 0.57 No B 18 64 03H 0.54 1.06 0.52 Yes (NDF)

A 14 59 02H 0.09 0.59 0.50 Yes (NDF)

A 24 39 02H 0.22 0.66 0.44 No B 4 59 02H 0.25 0.69 0.44 Yes (NDF)

A 8 28 02H 0.26 0.67 0.41 Yes (NDF)

C 7 12 08C 0.43 0.82 0.39 Yes (SAI)

C 4 33 02H 0.44 0.82 0.38 No C 34 55 03H 0.38 0.75 0.37 No A 15 74 03H 1.04 1.41 0.37 Yes (NDF)

C 17 66 02H 0.18 0.53 0.35 No C 16 46 04H 0.20 0.55 0.35 No A 6 27 06H 0.24 0.59 0.35 No A 8 91 04H 0.28 0.63 0.35 No A 29 24 02H 0.19 0.52 0.33 No B 13 77 03H 0.38 0.71 0.33 No C 5 6 03H 0.30 0.61 0.31 No SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-13 Predicted vs. Measured Voltage Distribution in SGA 160 140 120 100 80 60 40

- 2R21 Measured 2R21 Predicted 20 0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Figure 3-1 Voltage Distribution in SG-A (Measured vs. Predicted)

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-14 Predicted vs. Measured Voltage Distribution in SGB 160 140 120 100 80 60 40

- 2R21 Measured 2R21 Predicted 20 0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Figure 3-2 Voltage Distribution in SG-B (Measured vs. Predicted)

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-15 Predicted vs. Measured Voltage Distribution in SGC 160 140 120 100 80 60 40

- 2R21 Measured 2R21 Predicted 20 0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Figure 3-3 Voltage Distribution in SG-C (Measured vs. Predicted)

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-16 Number of Indications by TSP Number 200 180 160 140 Number of Indications 120 100 SG A 80 SG B SG C 60 40 20 0

02H 03H 04H 05H 06H 07H 08H 02C 03C 04C 05C 06C 07C 08C TSP Number Figure 3-4 Number of Measured Bobbin DSI as a Function of TSP SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-17 DSI Voltage Growth/EFPY Curve for SG A 1

0.9 0.8

~----------- ~-----------

0.7 0.6 CDF 0.5 2R20 Cumulative Distribution 2R21 Cumulative Distribution 0.4 2R21 Bounding Growth Curve 0.3 0.2 0.1 0

1 0.5 0 0.5 1 Growth Figure 3-5 Voltage Growth / EFPY in SG-A during Cycles 20 and 21 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-18 DSI Voltage Growth/EFPY Curve for SG B 1

0.9 0.8 0.7 0.6 I

CDF 2R20 Cumulative Distribution I I r r 0.5 0.4 0.3 I

I I

I 1= 2R21 Cumulative Distribution 2R21 Bounding Growth Curve I

I I I I I I

> > 0.2 0.1 0

1 0.5 0 0.5 1 Growth Figure 3-6 Voltage Growth / EFPY in SG-B during Cycles 20 and 21 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-19 DSI Voltage Growth/EFPY Curve for SG C 1

0.9 L------------L-----------

0.8

~------------~-----------

0.7

~------------~-----------

0.6 CDF r------------r-----------

0.5 2R20 Cumulative Distribution 2R21 Cumulative Distribution 0.4 2R21 Bounding Growth Curve L------------L-----------

0.3 0.2 0.1 0

1 0.5 0 0.5 1 Growth Figure 3-7 Voltage Growth / EFPY in SG-C during Cycles 20 and 21 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-20

~-------T-------,----------------1-------

1 ------- ,

0.9

~----------------~-------

0.8 - ------------------------------------~

~-------~-------~----------------~-------

0.7 ----~----------------~-------~-------~

T-------,------------------------

0.6 CDF

~-------~-------J ________________ L _____ _

0.5 ------~----------------~-------~-------J 0.4 2R20 Cumulative Distribution SGA 0.3 2R21 Cumulative Distribution SGA 2R20 Cumulative Distribution SGB 0.2 2R21 Cumulative Distribution SGB 2R20 Cumulative Distribution SGC 2R21 Cumulative Distribution SGC 0.1 2R21 Bounding Growth Curve Overall 0

1 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1 Growth Figure 3-8 Voltage Growth / EFPY in SGs A, B and Overall Bounding Growth Curve SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-21 Upper 5% of Growth/EFPY for SG A 1.01 1

0.99 0.98 2R20 Cumulative Growth 2R21 Cumulative Growth 0.97 2R21 Bounding Growth Curve 0.96 0.95 0.94 0 0.2 0.4 0.6 0.8 1 1.2 Figure 3-9 Upper 5% of Growth/EFPY for SG-A SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-22 Upper 5% of Growth/EFPY for SG B 1.01 1

0.99 0.98 2R20 Cumulative Growth 2R21 Cumulative Growth 0.97 2R21 Bounding Growth Curve 0.96 0.95 0.94 0 0.2 0.4 0.6 0.8 1 1.2 Figure 3-10 Upper 5% of Growth/EFPY for SG-B SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-23 Upper 5% of Growth/EFPY for SG C 1.01 1

0.99 0.98 2R20 Cumulative Growth 2R21 Cumulative Growth 0.97 2R21 Bounding Curve 0.96 0.95 0.94 0 0.2 0.4 0.6 0.8 1 1.2 Figure 3-11 Upper 5% of Growth/EFPY for SG-C SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

3-24 Cycle 21 Growth vs. BOC Volts 1.6 1.4 1.2 1

0.8 Growth in Volts 0.6 0.4 SG A Indications 0.2 SG B Indications 0

SG C Indications 0.2 0.4 Trendline R² = 0.1434 0.6 0.8 1

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 BOC Volts Figure 3-12 Cycle 21 Voltage Growth vs. BOC Voltage SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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 steam line break pressure to be applied is 2560 psi unless a lower pressure can be justified.

Therefore, the leak correlation for pressure of 2560 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-21 and EOC-22 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-21 and EOC-22. 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 BVPS2 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 2560 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 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

4-2 differential of 2560 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 steam generator is seen from Table 3-6 to be 16.5% for SGA. According to Reference 1, the minimum growth adjustment is 30% per EFPY (43.2% per cycle for the bounding 526 EFPD for Cycle 21). 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 43.2% 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 + 0.432 + 0.20) = 4.60 volts. No indications greater than this voltage were left in service; the largest DSI voltage reported at 2R21 was 1.61 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 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 BVPS2 SGs, it is unlikely that a bobbin coil DSI voltage of >4.5 volts will be observed within the BVPS2 SGs.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

4-3 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 Str. Limit (2560 psi) (1) 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 is Table 6-4 from Reference 4.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

4-4 Table 4-2 Tube Leak Rate vs. Bobbin Amplitude Correlation Parameters Q 10b3 b4 log Volts Parameter Addendum 7 Database Value SLB P = 2560 psi Intercept, b3 -0.33476 Slope, b4 0.95311 Index of Determination, r 2 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 Index of Determination, r 2 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 is Table 6-6 from Reference 4.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

4-5 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 Intercept Variance, V11 (1) 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 Note: (1) Parameters Vij are the elements of the covariance matrix of the coefficients, i, of the regression equation.

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

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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 2R21 and projected EOC-22 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 probability of detection (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.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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-22 voltage distributions.

6.1 Calculation of Voltage Distributions The analysis for EOC-22 voltage distribution starts with an initial voltage distribution which is projected to the end-of-cycle 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 probability of detection (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.

NTot RTS = Ni / POD - Nrepaired + Ndeplugged

where, NTot RTS = Number of bobbin indications being returned to service for the next cycle, Ni = Number of bobbin indications (in tubes in service) identified by inspection after the previous cycle, POD = Probability of detection, Nrepaired = Number of Ni which are repaired (plugged) after the last cycle, Ndeplugged = Number of indications in tubes deplugged after the last cycle and returned to service in accordance with voltage-based repair criteria.

There are no deplugged tubes returned to service at the beginning of Cycle 22 (BOC-22); therefore, Ndeplugged = 0. One (1) tube with one (1) indication at a TSP was plugged, therefore, Nrepaired = 1. The tube was plugged for reasons other than the presence of the DSI signal. 2R20 RPC no degradation found (NDF) indications were included in establishing the BOC-22 indication distributions shown in Table 6-1. 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-22 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.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

6-2 6.2 Probability of Detection (POD)

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-22 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 both cycles was used (Figure 3-5, Figure 3-6 and Figure 3-7). Growth distributions used in the Monte Carlo 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 21 - 505.87 EFPD or 1.385 EFPY (actual)

Cycle 22* - 515 EFPD or 1.410 EFPY (projected)

A conservative cycle length of 526 EFPD is applied in the Monte Carlo simulations for calculation of leak rate and burst probability.

6.5 Projected EOC-22 Voltage Distribution Calculations for the EOC-22 bobbin voltage projections were performed for all three SGs based on the 2R21 distributions shown in Table 6-1. The BOC-22 distributions were adjusted to account for probability of detection as described above, and the adjusted number of indications at BOC-22 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-22 and the distribution of indications projected to EOC-22 are shown in Figure 6-1, Figure 6-2 and Figure 6-3 for SG-A, SG-B and SG-C, respectively.

SG-B has the largest number of indications at BOC-21. 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.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

6-3 Table 6-1 Predicted Voltage Distribution at EOC-22 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-21 BOC-22 EOC-22 EOC-21 BOC-22 EOC-22 EOC-21 BOC-22 EOC-22 0.1 20 33.33 21.23 34 56.67 34.35 13 21.67 14.14 0.2 110 183.33 109.76 123 205.00 129.53 77 128.33 79.05 0.3 93 155.00 140.80 118 196.67 170.15 106 176.67 133.85 0.4 67 111.67 119.20 78 130.00 146.90 77 128.33 130.54 0.5 38 63.33 86.78 64 106.67 115.54 50 83.33 101.65 0.6 24 40.00 57.60 28 46.67 79.48 36 60.00 74.31 0.7 15 25.00 37.87 24 40.00 51.37 21 35.00 50.62 0.8 9 15.00 24.09 9 15.00 32.30 11 18.33 32.29 0.9 3 5.00 15.85 5 8.33 19.92 6 10.00 20.77 1.0 5 8.33 10.09 2 3.33 12.81 5 8.33 13.61 1.1 1 1.67 6.59 6 10.00 9.57 3 5.00 8.76 1.2 1 1.67 5.39 4 6.67 8.32 1 1.67 6.21 1.3 1 0.67 4.08 0 0.00 6.11 0 0.00 4.56 1.4 1 1.67 2.96 0 0.00 3.79 0 0.00 3.02 1.5 1 1.67 2.11 0 0.00 2.22 1 1.67 1.92 1.6 0 0.00 1.52 0 0.00 1.19 0 0.00 1.25 1.7 1 1.67 1.10 0 0.00 0.46 0 0.00 0.78 1.8 0 0.00 0.75 0 0.00 0.00 0 0.00 0.03 1.9 0 0.00 0.22 0 0.00 0.70 0 0.00 0.70 2.0 0 0.00 0.00 0 0.00 0.30 0 0.00 0.00 2.1 0 0.00 0.70 0 0.00 0.00 0 0.00 0.30 2.2 0 0.00 0.30 0 0.00 0.00 0 0.00 0.00 Total 390 649 649 495 825 825 407 679 679 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

6-4 Cycle 22 SG A Predicted Voltage Distribution BOC22 Voltage Distribution EOC22 Voltage Distribution 220.00 200.00 180.00 Number of Indications 160.00 140.00 120.00 100.00 - - -....

80.00 ..__ I-60.00 ..__ I- .... -

40.00 ..__ I- .... - ....

20.00 0.00 lt - - - - j lj -1 .

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 Voltage Bin Figure 6-1 SG-A Predicted Voltage Distribution at EOC-22 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

6-5 Cycle 22 SG B Predicted Voltage Distribution BOC22 Voltage Distribution EOC22 Voltage Distribution 220.00 200.00 180.00 Number of Indications 160.00 140.00 120.00 - -

t-100.00 -

80.00 -

t-t-

60.00 - ---

40.00 ._ t-

- t- - t-20.00 0.00 t t-

- t- - >-

.. J I

_I - ..

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 Voltage Bin Figure 6-2 SG-B Predicted Voltage Distribution at EOC-22 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

6-6 Cycle 22 SG C Predicted Voltage Distribution BOC22 Voltage Distribution EOC22 Voltage Distribution 220.00 200.00 180.00 Number of Indications 160.00 140.00 120.00 ._

100.00 ._

80.00 - - - -

60.00 - -- --

40.00 - -- --

20.00 -- -- - I 0.00 I:

0.1 0.2 0.3 0.4 0.5 0.6

.I....* ...

0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 I

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 Voltage Bin Figure 6-3 SG-C Predicted Voltage Distribution at EOC-22 SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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 2R21 inspection (condition monitoring assessment) as well as for the projected EOC-22 voltage distributions (operational assessment). The methodology used in these analyses is described in Section 6.

7.1 2R21 Condition Monitoring Leak Rate and Tube Burst Probability Analyses to calculate the 2R21 SLB leak rates and tube burst probabilities were performed using the actual bobbin voltage distributions presented in Table 3-2, Table 3-3 and Table 3-4. The results of the Monte Carlo calculations are summarized in Table 7-1, in addition to the 2R21 predictions from the EOC-20 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 2R21 voltage distributions using 1,000,000 Monte Carlo trials, are shown in Table 7-1. The methodology used for these calculations is documented in WCAP-14277, Revision 1. 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 2560 psi. The maximum 2R21 leak rate of 0.052 gpm and the maximum conditional burst probability of 1.44 x 10-5 are well below their respective allowable limits (2.2 gpm per Reference 11, and 1.0 x 10-2 per Reference 1, respectively). Therefore, the condition monitoring performance criteria are satisfied.

7.2 Cycle 22 Operational Assessment Leak Rate and Tube Burst Probability The SLB leak rate and tube burst probability projection for the Cycle 22 Operational Assessment 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-21 leak and burst analyses were performed using a primary-to-secondary pressure differential of 2560 psi, even though it is likely that PORV actuation will occur prior to the pressurizer safety relief valve lift setting.

The EOC-22 projections, considering a 526 EFPD operation cycle and using POD = 0.6 are shown in Table 7-2. Both the maximum projected EOC-22 leak rate of 0.207 gpm and the maximum conditional burst probability of 3.61 x 10-5 are well below their respective allowable limits (2.2 gpm and 1.0 x 10-2, respectively). Therefore, the Operational Assessment performance criteria for the DSI indications are satisfied for Cycle 22.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

7-2 Table 7-1 Condition Monitoring Leak and Burst Results for 2R21 OA Performed OA Performed at EOC-20 EOC-21 Actual at EOC-20 EOC-21 Actual Predicted Predicted Actual Predicted Actual SLB Leak Probability SLB Leak Actual Number of Predicted Number of Actual Rate at of Burst at Rate at Probability of Indications Max. Indications Max. 95/95 95% 95/95 Burst at 95%

SG at EOC-21 Voltage at EOC-21 Voltage (gpm) Confidence (gpm) Confidence A 580 1.90 390 1.61 0.096 1.44 x 10-5 0.046 1.18 x 10-5 B 748 1.90 495 1.17 0.166 1.82 x 10-5 0.052 1.18 x 10-5 C 607 2.00 407 1.45 0.153 2.43 x 10-5 0.050 1.44 x 10-5 Table 7-2 Operational Assessment Leak and Burst Results for EOC-22 (POD = 0.6)

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

SG at EOC-21 Projection EOC-21 (gpm) Confidence SG-A Cycle 21 Bound (1) 649 (4) 2.2 (7) 0.175 (10) 2.67 x 10-5 SG-B Cycle 21 Bound (2) 825 (5) 2.0 (8) 0.207 (11) 3.26 x 10-5 SG-C Cycle 21 Bound (3) 679 (6) 2.1 (9) 0.191 (12) 3.61 x 10-5 Notes to Table 7-2:

(1): This number was calculated as 667.3 and was rounded up to 668 in Reference 15. However, it is recalculated as 649.0 with no rounding up necessary.

(2): This number was calculated as 833.3 but was rounded down to 833 in Reference 15. However, it is recalculated as 825.0 with no rounding up necessary.

(3): This number was calculated as 678.3 but was rounded down to 678 in Reference 15. However, it is rounded up to 679 for consistency to Notes (1) and (2).

(4), (5), (6) and (8): These numbers were unchanged upon recalculation.

(7), (9), (10), (11) and (12): These numbers were changed upon recalculation, with SG-C having the limiting burst probability instead of SG-A as indicated in Reference 15.

The growth rate used for the OA of each SG bounds both Cycles 20 and 21 growth rates.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

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-SGMP-18-24, Revision 0, Beaver Valley Unit 2 End-of-Cycle 20 Analysis and Prediction for End-of-Cycle 21 Voltage-Based Repair Criteria 90-Day Report, January 2019.

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. FENOC Letter BVTS-0109, 2R16 Steam Generator 90 Day Alternate Repair Criteria Report Input Data Validation, January 2, 2013.

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.

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

8-2

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-20-13, Revision 0, Beaver Valley Unit 2 Refueling Outage 21 Steam Generator Alternate Repair Criteria Generic Letter 95-05 Return to Power Report, April 2020.

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

SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-1 APPENDIX A Table A-1 SG-A 2R21 DSI Indications Comments Row Col Volts Location SAI/MAI NDF PLUG 2 24 0.23 07H 2 88 0.41 02H 2 92 0.39 03H 2 93 0.46 03H 3 15 0.3 03H 3 59 0.46 02H NDF 3 65 0.37 07C 3 65 0.75 07H 3 77 0.41 08H SAI 3 79 0.31 07H 3 81 0.55 03H 3 84 0.42 03H 3 85 0.63 04H 3 92 0.21 02H 4 9 0.77 03H NDF 4 9 0.22 04H 4 18 0.25 05H 4 21 0.37 03H 4 24 0.22 02H 4 26 0.25 02H 4 28 0.7 03H 4 34 0.34 03H 4 39 0.09 02H 4 50 0.14 02H 4 50 0.25 03H 4 50 0.33 04H 4 54 0.46 02H 4 54 0.35 04H 4 54 0.33 05H 4 60 0.37 02H NDF 4 60 0.34 06H NDF 4 63 0.22 02H 4 70 0.17 03H 4 78 0.24 05H 4 85 0.14 08C 4 86 0.21 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-2 Comments Row Col Volts Location SAI/MAI NDF PLUG 5 10 0.99 02H 5 10 0.82 03H 5 10 0.47 04H 5 11 0.37 04H 5 18 0.6 06H SAI 5 20 0.16 08C 5 25 0.62 05H 5 26 0.48 02H 5 26 0.36 03H 5 28 1.32 04H NDF 5 29 1.14 02H SAI 5 30 0.1 03H 5 53 0.8 02H 5 57 0.13 04H 5 60 0.13 04H 5 80 0.21 05H 5 82 0.33 03H 6 15 0.37 02H 6 20 0.45 04H 6 27 0.59 06H 6 32 0.23 02H 6 34 0.35 02H 6 35 0.99 02H SAI 6 35 0.4 03H 6 35 0.39 04H 6 35 0.36 05H 6 35 0.66 08H NDF 6 40 0.25 03H 6 40 0.21 04H 6 41 0.25 08H SAI 6 43 0.31 02H 7 14 0.27 03H 7 18 1.61 02H NDF 7 18 0.56 03H 7 18 0.39 05H NDF 7 19 0.45 02H 7 19 0.44 03H 7 27 0.47 05H 7 49 0.15 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-3 Comments Row Col Volts Location SAI/MAI NDF PLUG 7 51 0.21 02H 7 51 0.29 05H 7 94 0.25 02H 8 19 0.46 02H 8 28 0.67 02H NDF 8 29 0.13 02H 8 32 0.43 03H 8 32 0.47 05H SAI 8 32 0.32 07H NDF 8 34 0.78 03H 8 42 0.08 02H 8 67 0.29 02H 8 69 0.31 02H 8 76 0.11 05H 8 85 0.01 02H 8 91 0.63 04H 9 7 0.27 02H SAI 9 10 0.93 02H 9 13 0.31 02H 9 14 0.13 03H 9 16 0.43 02H 9 16 0.58 03H 9 16 0.35 04H 9 18 0.28 05H 9 34 0.27 02H SAI 9 35 0.41 02H 9 38 0.49 05H 9 40 0.42 03H 9 51 0.52 04H SAI 9 56 0.15 02H 9 56 0.3 04H 9 57 0.49 02H 9 57 0.59 03H 9 74 0.2 03H 10 7 0.42 02H 10 7 0.34 03H 10 8 0.24 03H 10 19 0.24 04H 10 26 0.17 04H NDF SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-4 Comments Row Col Volts Location SAI/MAI NDF PLUG 10 34 0.89 04H SAI 10 37 0.27 03H 10 38 0.11 04H 10 58 0.12 04H 10 76 0.65 05H 11 2 0.58 03H 11 48 0.8 02H NDF 11 48 0.32 08H 11 77 0.39 05H 11 78 0.12 05H 11 78 0.2 06H 12 16 0.66 02H SAI 12 34 0.25 02H 12 48 0.23 05H 12 69 0.43 02H 12 69 0.25 03H 12 70 0.32 03H 12 72 0.16 02H 12 73 0.18 05H 12 74 0.54 02H 12 74 0.52 03H 12 80 0.12 05H 13 32 0.09 02H 13 49 0.13 04H 13 60 0.53 02H 13 65 0.13 06C 13 67 0.3 06C 13 71 0.22 04H 13 80 0.37 03H 13 84 0.59 02H 13 85 0.43 02H 13 86 0.22 03H 13 91 0.22 05C 13 91 0.49 05H 13 92 0.53 04H 14 15 0.19 04H 14 20 0.24 03H 14 25 0.28 05H 14 27 0.01 05H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-5 Comments Row Col Volts Location SAI/MAI NDF PLUG 14 31 0.27 02H 14 31 0.11 05H 14 40 0.2 05H SAI 14 46 0.1 02H 14 47 0.24 02H NDF 14 47 0.21 04H 14 48 0.4 05H 14 50 0.19 03H 14 53 0.09 02H 14 54 0.38 02H 14 58 0.58 02H 14 59 0.59 02H NDF 14 59 0.2 03H NDF 14 59 0.6 06H 14 65 0.25 03H 14 68 0.4 02H 14 70 0.47 02H 14 70 0.77 03H 14 71 0.13 02H 14 71 0.19 03H 14 71 0.17 04H 14 72 0.2 06H 14 77 0.15 02H 14 80 0.21 03H 14 86 0.38 04H 15 27 0.14 05H NDF 15 31 0.28 04H SAI 15 63 0.1 02H 15 67 0.25 02H 15 71 0.08 02H 15 72 0.18 02H 15 73 0.5 03H 15 73 0.17 05H 15 74 1.41 03H NDF 15 75 0.7 02H 15 75 0.37 08H SAI 16 11 0.22 05H SAI 16 50 0.25 05C 16 52 0.56 02H NDF SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-6 Comments Row Col Volts Location SAI/MAI NDF PLUG 16 53 0.34 03H 16 60 0.28 02H 16 62 0.07 08H 16 66 0.21 03H 16 70 0.44 03H 16 72 0.09 02H 16 76 0.18 02H 16 77 0.11 05H 17 10 0.35 03H 17 27 0.18 04H 17 32 0.28 05H 17 46 1.28 02H NDF PLG 17 54 0.19 03H 17 59 0.51 02H 17 59 0.21 05H 17 81 0.1 03H 17 81 0.23 04H 17 84 0.15 03H 18 7 0.24 04H 18 10 0.66 03H 18 10 0.2 04H 18 14 0.31 04H 18 27 0.19 07H 18 30 0.1 04H 18 47 0.16 02H 18 47 0.4 05H 18 48 0.18 02H 18 57 0.61 02H 18 58 0.54 02H 18 88 0.11 05H 19 7 0.35 02H NDF 19 7 0.31 03H SAI 19 8 0.23 03H 19 15 0.2 03H 19 15 0.2 04H 19 56 0.73 03H 19 57 0.57 02H 19 57 0.22 04H 19 60 0.2 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-7 Comments Row Col Volts Location SAI/MAI NDF PLUG 20 7 0.16 08C 20 9 0.2 03H 20 10 0.18 04H 20 12 0.11 02H 20 22 0.91 02H 20 22 0.34 03H 20 22 0.25 08H 20 44 0.11 02H 20 57 0.14 02H 20 62 0.36 05H 20 72 0.21 07C NDF 20 75 0.33 05H 20 78 0.14 04H 20 85 0.15 03H 21 18 0.41 04H 21 25 0.17 03H 21 26 0.41 05H 21 34 0.46 02H 21 43 0.28 02H 21 46 0.22 02H 21 48 0.54 04H 21 55 0.03 02H 21 61 0.16 08H 21 72 0.2 03H 21 73 0.26 03H 21 78 0.19 08H 21 87 0.13 08C 22 7 0.24 02H 22 21 0.04 02H 22 21 0.35 03H 22 23 0.28 02H 22 24 0.27 02H 22 25 0.16 02H 23 11 0.37 02H 23 11 0.13 03H 23 19 0.67 02H 23 20 0.24 02H 23 21 0.16 03H 23 52 0.33 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-8 Comments Row Col Volts Location SAI/MAI NDF PLUG 23 53 0.22 02H SAI 23 53 0.2 04H 23 87 0.46 04H 24 16 0.25 02H 24 16 0.12 03H 24 23 0.68 05H 24 24 0.08 02H 24 33 0.2 03H 24 39 0.66 02H 24 52 0.37 02H 24 63 0.35 05H 24 80 0.14 03H 25 21 0.09 02H 25 22 0.45 02H 25 30 0.55 04H 25 30 0.19 06H 25 50 0.29 08H 26 15 0.17 03H 26 19 0.11 04H 26 42 0.33 02H 26 64 0.24 02H 26 80 0.11 05H 27 32 0.16 02H 27 33 0.46 03H 27 34 0.2 04H 27 34 0.18 05H 27 42 0.28 04H SAI 27 42 0.41 05H 27 47 0.34 02H 27 55 0.16 03H 27 55 0.13 04H 27 64 0.17 02H 27 75 0.18 05H 28 13 0.42 03H 28 26 0.83 04H 28 41 0.21 02H 28 42 0.4 03H 28 45 0.49 02H 28 46 0.11 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-9 Comments Row Col Volts Location SAI/MAI NDF PLUG 28 54 0.3 02H 28 56 0.64 03H 28 66 0.23 04H SAI 29 24 0.52 02H 29 24 0.34 04H 29 30 0.4 05H 29 48 0.13 04H 29 54 0.29 03H SAI 29 65 0.35 02H 29 81 0.26 05H 30 22 0.15 02H 30 28 0.24 03H 30 38 0.15 02H 30 48 0.34 04H 30 48 0.11 06H 30 50 0.15 05C 30 51 0.35 08C 30 54 0.2 04H 30 58 0.26 04H 30 63 0.11 08H 30 68 0.15 02H 31 14 0.35 04H 31 18 0.53 02H 31 18 0.36 03H 31 18 0.34 07H 31 74 0.46 02H SAI 32 22 0.17 02H 32 27 0.78 03H 32 35 0.1 06H 32 38 0.17 02H 32 38 0.25 03H 32 45 0.38 02H NDF 32 51 0.17 05H 32 53 0.24 03H 33 18 0.12 02H 33 18 0.26 03H 33 22 0.13 02H 33 27 0.26 06H 33 42 0.25 05H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-10 Comments Row Col Volts Location SAI/MAI NDF PLUG 33 45 0.24 07H 33 54 0.3 06H 33 57 0.25 04H 33 66 0.26 02H 33 70 0.11 05H 34 24 0.11 03H 34 40 0.21 03H 34 52 0.06 02H 34 53 0.28 02H 34 56 0.28 05H 35 45 0.77 02H 36 23 0.16 08C 36 28 0.35 03H 36 28 0.18 04H 36 44 0.33 03H 36 46 0.15 06H 36 56 0.15 07C 37 30 0.22 08H 37 39 0.13 02H 37 39 0.23 03H 37 42 0.36 03H 37 48 0.19 04H 37 54 0.2 05H 37 56 0.21 02H 37 56 0.42 03H 38 40 0.32 05H 38 44 0.2 02H 39 23 1.03 02H NDF 39 42 0.35 02H 39 46 0.39 02H 39 47 0.26 02H 39 50 0.18 04H 40 29 0.22 02H 40 37 0.98 03H 40 44 0.12 06C 41 27 0.18 03H 42 64 0.32 04H 44 35 0.13 03H 44 40 0.14 05C SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-11 Comments Row Col Volts Location SAI/MAI NDF PLUG 44 58 0.13 06H 45 48 0.19 08C 46 52 0.29 06H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-12 Table A-2 SG-B 2R21 DSI Indications Comments Row Col Volts Location SAI/MAI NDF PLUG 1 43 0.46 02H 1 52 0.33 02H 1 56 0.12 02H NDF 1 57 0.28 04H 1 81 0.15 02H 2 15 1.02 02H NDF 2 15 0.74 03H SAI 2 28 0.21 02H 2 33 0.14 03H 2 54 0.11 04H 2 63 0.11 04H 2 65 0.12 03H 2 67 0.16 06H 2 69 0.09 05H 2 70 0.71 05H 2 73 0.45 03H 2 73 0.16 04H 2 73 0.18 05H 2 75 0.13 02H 2 94 0.33 04H 3 31 0.55 02H 3 32 0.25 03H 3 49 0.57 04C 3 54 0.35 02H 3 55 0.65 02H 3 55 0.11 04H 3 58 0.28 03H 3 60 0.5 02H 3 60 0.51 03H 3 61 0.33 06H 3 62 0.41 03H 3 62 0.18 04H 3 63 0.48 02H 3 63 0.47 03H 3 65 0.85 03H NDF 3 72 0.25 03H 3 88 0.39 04H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-13 Comments Row Col Volts Location SAI/MAI NDF PLUG 3 89 0.29 04H 4 23 0.28 02H 4 23 0.35 06H 4 29 0.37 02H 4 32 0.22 03H 4 36 0.72 04H SAI 4 41 0.33 02H 4 41 0.18 04H 4 43 0.17 02H 4 44 0.19 02H 4 48 0.66 03H NDF 4 51 0.42 05C 4 52 0.53 03H 4 54 0.84 02H 4 56 0.25 04H 4 57 0.28 02H 4 57 0.22 04H 4 58 0.52 02C NDF 4 58 0.44 02H 4 59 0.69 02H NDF 4 59 1.09 03H NDF 4 62 0.22 03H 4 62 0.4 07H 4 63 0.24 04H 4 68 0.32 02H 4 88 0.27 04H NDF 5 10 0.25 02H 5 12 0.15 03H 5 14 0.35 03H 5 20 0.55 03H 5 22 0.79 04H 5 28 0.54 02H 5 33 0.54 02H 5 52 1.14 02H NDF 5 54 0.56 02H 5 54 0.23 03H 5 54 0.64 07C 5 56 0.5 03H 5 58 0.25 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-14 Comments Row Col Volts Location SAI/MAI NDF PLUG 5 60 0.2 02H 5 62 0.25 03H 5 63 0.2 04H 5 64 0.29 02H 5 64 0.12 03H 5 68 0.47 02H 5 70 1.04 05H NDF 5 71 0.36 02H 5 71 0.32 06C 5 73 0.29 02H 5 73 0.14 04H 5 75 0.16 03H 5 75 0.14 04H 5 81 0.13 05H 5 92 0.17 02H 5 93 0.3 03H 6 16 0.19 03H 6 23 0.12 04H 6 25 0.21 03H 6 26 0.19 02H 6 27 0.3 03H SAI 6 52 0.12 02H 6 53 0.28 02H 6 53 0.12 03H 6 58 0.36 02H 6 58 0.26 03H 6 61 0.15 08H 6 63 0.14 02H 6 66 0.94 03H 6 70 0.78 05H 7 52 0.63 02H 7 54 0.15 02H 7 56 1.17 02H NDF 7 56 0.31 06C 7 63 0.31 07H 7 64 0.28 04H 7 70 0.43 04H 7 70 0.25 05H 7 75 0.06 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-15 Comments Row Col Volts Location SAI/MAI NDF PLUG 8 2 0.12 03H 8 9 0.17 02H 8 9 0.22 03H 8 18 0.23 02H 8 18 0.28 03H 8 20 0.31 02H 8 22 0.37 02H 8 31 0.3 07C 8 37 0.43 03H 8 53 0.68 02H 8 56 0.48 03H 8 57 0.19 08H 8 59 0.36 02H 8 59 0.14 05H 8 63 0.32 04H 9 4 0.5 03H SAI 9 5 0.27 03H 9 8 0.31 03H 9 11 0.51 02H 9 11 0.38 03H 9 16 0.1 03H 9 17 0.41 02H 9 17 0.34 03H 9 18 0.13 02H NDF 9 18 0.41 03H 9 26 0.31 02H 9 26 0.6 03H 9 52 0.22 02H 9 52 0.34 03H 9 59 0.43 03H 9 59 0.27 05H 9 61 0.5 07C 9 64 0.4 04H SAI 9 70 0.17 03H 9 70 0.5 05H 9 72 0.39 04H 9 77 0.17 04H 9 80 0.63 02H 9 85 1.03 02H NDF SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-16 Comments Row Col Volts Location SAI/MAI NDF PLUG 9 92 0.46 02H 9 93 0.27 02H 10 6 0.5 02H 10 10 0.24 02H 10 14 0.45 02H 10 15 0.34 02H 10 17 0.51 02H 10 18 0.4 02H 10 26 0.19 02H 10 26 0.28 05H 10 37 0.38 03H 10 41 0.16 07H 10 50 0.24 02H 10 50 0.23 03H 10 50 0.21 04H 10 52 0.55 02H 10 52 0.21 04H 10 53 0.69 02H 10 54 0.09 02H 10 56 0.44 02H 10 58 0.13 05H 10 63 0.26 02H 10 71 0.2 02H 10 71 0.58 05H 10 76 0.39 03H SAI 10 78 0.35 04H 10 80 0.41 03H 10 82 0.19 03H 10 88 0.11 04C 10 89 0.44 02H 11 8 0.22 03H 11 8 0.12 04H 11 9 0.08 06H 11 9 0.38 07H NDF 11 18 0.3 02H 11 20 0.47 02H 11 21 0.17 03H 11 25 0.26 03H SAI 11 35 0.14 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-17 Comments Row Col Volts Location SAI/MAI NDF PLUG 11 42 0.22 03H 11 51 0.05 02H 11 53 0.48 02H 11 53 0.42 08C 11 57 0.24 03H 11 58 0.1 03H 11 58 0.21 04H 11 61 0.89 02H 11 61 0.38 03H 11 64 0.41 03H 11 75 0.45 02H NDF 11 75 0.19 03H 11 83 0.39 03H 11 83 0.26 04H 12 10 0.51 02H 12 15 0.39 02H 12 15 0.57 03H 12 16 0.26 03H 12 22 0.48 02H 12 24 0.34 02H NDF 12 24 0.26 04H 12 51 0.09 02H 12 52 0.46 02H 12 52 0.54 03H 12 61 0.38 03H 13 37 0.32 03H 13 39 0.13 07H 13 47 0.35 02H SAI 13 53 0.67 02H 13 56 0.17 03H 13 71 0.17 05C 13 73 0.34 02H 13 77 0.71 03H 13 78 0.07 02H 13 85 0.35 02H 13 86 0.17 02H 13 91 0.49 02H 14 13 0.2 02H 14 15 0.31 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-18 Comments Row Col Volts Location SAI/MAI NDF PLUG 14 18 0.4 02H 14 25 0.33 02H 14 27 0.17 03H 14 28 0.16 05H 14 32 0.24 02H 14 35 0.27 06H 14 36 0.29 03H 14 39 0.29 02H 14 54 0.29 02H 14 54 0.24 03H 14 57 0.66 02H 14 57 0.4 03H 14 61 0.37 02H 14 61 0.5 03H 14 61 0.49 05H 14 63 0.23 03H 14 70 0.68 02H 14 80 0.19 03H 14 80 0.24 03H 14 83 0.29 03C NDF 14 84 0.16 04H 14 88 0.18 02H 15 12 0.16 03H 15 21 0.1 03H 15 26 0.47 03H 15 26 0.11 07H 15 27 0.1 02H 15 36 0.25 02H 15 49 0.58 04H 15 52 0.26 02H 15 71 0.2 05H 15 75 0.1 02H 15 75 0.2 04H 15 80 0.49 04H 15 87 0.25 02H 15 89 0.27 02H 16 27 0.34 03H 16 29 0.12 02H SAI 16 31 0.3 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-19 Comments Row Col Volts Location SAI/MAI NDF PLUG 16 31 0.29 07H 16 36 0.22 04H 16 37 0.25 02H 16 37 0.26 04H SAI 16 44 0.27 02H 16 55 0.3 05H 16 61 0.22 02H 16 71 0.07 02H 17 35 0.65 03H 17 40 0.27 03H SAI 17 42 0.66 03H 17 42 0.43 04H 17 43 0.19 04H 17 44 0.53 02H SAI 17 62 0.48 05H 17 64 0.06 02H 17 68 0.24 02H 17 68 0.52 03H 17 68 1.09 04H SAI 17 83 0.2 06C 18 12 0.16 03H 18 18 0.16 02H 18 28 0.73 04H 18 29 0.4 02H 18 30 0.19 04H 18 36 0.93 03H 18 37 0.18 03H 18 38 0.31 03H 18 40 0.46 02H 18 42 0.35 02H 18 53 0.29 03H 18 53 0.23 04H 18 54 0.85 02H 18 57 0.3 03H 18 58 0.39 02H 18 61 0.09 03H 18 64 1.06 03H NDF 18 69 0.09 04H 18 69 0.26 05H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-20 Comments Row Col Volts Location SAI/MAI NDF PLUG 18 74 0.3 02H 18 76 0.27 03H 18 76 0.24 05H 19 15 0.39 02H 19 15 0.15 04H 19 29 0.56 02H 19 29 0.7 03H 19 30 0.49 03H SAI 19 34 0.49 02H SAI 19 36 0.67 02H 19 39 0.46 03H 19 39 0.28 04H 19 40 0.54 03H 19 45 0.35 02H 19 50 0.68 03H 19 51 0.4 02H 19 51 0.46 03H 19 69 0.67 02H 19 71 0.32 05H 19 74 0.08 02H 19 76 0.13 02H 19 78 0.11 02H 19 85 0.24 02H 20 11 0.48 02H 20 16 0.32 03H 20 19 0.08 04H 20 20 0.24 03H 20 20 0.32 04H 20 23 0.19 02H SAI 20 36 0.6 08H 20 70 0.17 02H 20 78 0.24 04H 20 81 0.22 02H 20 89 0.44 02H 21 18 0.16 04H 21 29 0.43 03H 21 45 0.23 04H 21 53 0.62 03H 21 53 0.21 05H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-21 Comments Row Col Volts Location SAI/MAI NDF PLUG 21 54 0.55 02H 21 75 0.19 02H 22 18 0.74 03H SAI 22 36 0.11 03H 22 52 0.14 02H 22 52 0.35 03H 22 53 0.12 02H 22 61 0.18 05H 22 62 0.4 03H 22 64 0.37 02H 23 33 0.3 03H 23 37 0.61 04H SAI 23 56 0.11 02H 23 61 0.19 02H 23 63 0.14 03H 23 63 0.17 05H 23 67 0.17 05H 23 86 0.26 02H 24 29 0.24 05H 24 30 0.33 03H 24 32 0.19 03H 24 42 0.57 02H 24 51 0.11 08H 24 52 0.37 02H 24 56 0.13 02H 24 58 0.23 03H 24 62 0.5 03H 24 63 0.48 03H 24 65 0.09 02H 24 68 0.13 08H 24 71 0.15 05H 24 79 0.2 07H 24 84 0.34 05H 25 17 0.09 02H 25 18 0.23 05C 25 24 0.49 03H 25 29 0.14 02H 25 38 0.1 04H 25 64 0.4 06H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-22 Comments Row Col Volts Location SAI/MAI NDF PLUG 25 79 0.38 08H 26 30 0.56 03H 26 39 0.08 03H 26 78 0.12 02H 27 17 0.22 05H 27 28 0.45 03H 27 46 0.14 06H 27 52 0.27 04H 27 53 0.18 03H 27 68 0.2 02H 28 41 0.33 02H 28 59 0.38 04H 28 63 0.18 03H 28 67 0.46 03H 28 81 0.15 02H 29 20 0.3 03H 29 27 0.24 02H 29 27 0.47 03H 29 31 0.2 05H 29 32 0.33 03H 29 32 0.16 05H 29 34 0.34 03H 29 35 0.17 04H SAI 29 37 0.11 03H 29 38 0.3 02H MAI 29 40 0.65 03H 29 41 0.25 02H 29 56 1.13 02H NDF 30 16 0.12 04H 30 16 0.11 07H 30 20 0.22 04H NDF 30 27 0.18 02H 30 32 0.25 03H 30 50 0.55 04H 30 55 0.47 03H 30 56 0.49 04H 30 59 0.2 04H 30 78 0.08 02H 30 78 0.24 04H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-23 Comments Row Col Volts Location SAI/MAI NDF PLUG 30 79 0.23 02H 30 81 0.12 03H 31 21 0.41 07H 31 23 0.57 02H 31 32 0.43 03H 31 32 0.41 05H 31 37 0.5 03H 31 39 0.1 02H 31 39 0.17 03H 31 48 0.81 02H 31 52 0.5 02H 31 64 0.09 02H 31 71 0.13 05H 31 75 0.15 04H 31 76 0.32 02H 31 78 0.34 02H 31 78 1.17 03H NDF 32 16 0.18 08H 32 29 0.21 05H 32 31 0.2 02H SAI 32 53 0.31 02H 32 55 0.2 02H 32 55 0.17 05H 32 61 0.37 02H 32 61 0.42 05H 32 77 0.28 02H 33 29 0.06 02H 33 31 0.09 06H 33 31 0.28 07H 33 32 0.33 02H 33 37 0.21 04H 33 44 0.26 02H 33 60 0.09 03H 33 62 0.46 02H 33 73 0.37 07H 34 18 0.37 08H 34 32 0.29 02H 34 35 0.17 03H 34 37 0.27 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-24 Comments Row Col Volts Location SAI/MAI NDF PLUG 34 48 0.65 02H 34 48 0.29 03H 34 48 0.2 04H 34 51 0.76 02H 34 51 0.34 03H 34 57 0.17 02H 35 40 0.11 02H 36 25 0.13 05H 36 42 0.19 03H 36 58 0.27 05H 36 64 0.08 02H 37 24 0.08 05H 37 32 0.69 03H 37 57 0.29 02H 37 57 0.07 05H 38 35 0.18 02H 38 63 0.07 03H 39 31 0.14 05H 39 33 0.23 03H 40 31 0.1 05H 40 42 0.61 02H 41 31 0.23 05H 41 52 0.21 08C 41 68 0.26 04H 42 51 0.09 04H 44 48 0.26 02H 44 53 0.45 05H 45 36 0.66 08H NDF 45 37 0.42 08H NDF SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-25 Table A-3 SG-C 2R21 DSI Indications Comments Row Col Volts Location SAI/MAI NDF PLUG 1 23 0.33 07C 2 78 0.37 03H 2 80 0.19 03H 2 85 0.4 03H 3 8 0.38 04H 3 9 0.1 04H 3 9 0.12 06H 3 12 0.27 07H 3 18 0.22 03H 3 35 0.27 05H 3 39 0.14 04H 3 39 0.56 07H 3 45 0.46 02H 3 58 0.45 02H 3 60 0.38 02H 3 60 0.32 03H 3 64 0.21 02H 3 64 0.66 03H 3 80 0.55 02H 3 90 0.32 06H 3 93 0.35 04H 3 94 0.55 04H 4 3 0.14 04H 4 11 0.26 02H 4 26 0.68 03H 4 28 0.31 06H 4 33 0.82 02H SAI 4 33 0.51 04H SAI 4 39 0.5 07H SAI 4 48 0.24 02H 4 49 0.48 03H 4 69 0.26 03H 4 76 0.41 03H 5 6 0.61 03H 5 6 0.18 04H 5 7 0.24 02H 5 7 0.86 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-26 Comments Row Col Volts Location SAI/MAI NDF PLUG 5 15 0.3 03H 5 15 0.5 04H SAI 5 18 0.22 02H 5 19 0.48 02H 5 19 0.22 03H 5 29 0.61 02H 5 29 0.18 03H 5 61 0.32 02H 5 62 0.29 02H 5 66 0.47 03H 5 70 0.54 05C 5 71 0.34 02H 5 76 0.3 03H 5 86 0.68 08H 5 89 0.54 02H NDF 6 23 0.36 02H 6 30 0.43 02H 6 30 0.19 03H 6 54 0.54 03H 6 55 0.38 02H 6 63 0.68 02H 6 63 0.32 04H 6 78 0.76 03H 6 84 0.34 03H 6 87 0.24 03H 6 92 0.27 04H 7 12 0.82 08C SAI 7 40 0.32 03H 7 40 0.28 04H 7 49 0.28 02H 7 49 0.17 03H 7 58 0.3 02H 7 67 0.39 02H 7 80 0.21 03H 8 2 0.32 08H 8 23 0.72 02H 8 24 0.41 02H 8 43 0.23 03H 8 63 0.17 06H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-27 Comments Row Col Volts Location SAI/MAI NDF PLUG 8 72 0.15 03H 8 84 0.29 03H 9 13 0.1 03H 9 20 0.51 04H 9 26 0.41 03H 9 30 0.32 02H 9 32 0.82 02H 9 35 0.47 02H 9 37 0.3 02H 9 38 0.31 03H 9 39 0.27 05H 9 41 0.34 02H NDF 9 44 0.15 03H 9 45 0.43 05H 9 45 0.25 06H 9 47 0.55 02H 9 54 0.75 02H 9 54 0.3 04H 9 62 0.14 04H 9 65 0.25 06H 9 74 0.28 04H 10 8 0.78 02H 10 9 0.2 03H 10 10 0.6 02H 10 10 0.47 03H 10 18 0.18 04H 10 24 0.19 03H 10 36 0.28 02H 10 37 0.54 02H 10 38 0.45 07H 10 43 0.22 02H 10 44 0.35 02H 10 51 0.93 02H 10 51 0.96 03H 10 51 0.24 05H 10 54 0.61 02H 10 54 0.33 03H 10 72 0.45 02H 10 72 0.14 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-28 Comments Row Col Volts Location SAI/MAI NDF PLUG 10 76 0.12 04H 10 78 0.05 03H 11 7 0.57 02H 11 9 0.62 03H 11 17 0.47 02H 11 36 0.68 02H 11 49 0.45 02H 11 57 0.26 07C 11 62 0.35 03H 11 70 0.19 03H 11 72 0.35 03H 11 77 0.25 04H 11 77 0.18 05H 11 88 0.6 05H 12 9 0.49 02H 12 30 0.37 02H 12 35 0.08 04H 12 35 0.08 05H 12 55 0.3 02H 12 70 0.21 02H 12 70 0.26 03H 12 83 0.21 03H 13 7 0.32 03H 13 32 0.1 02H 13 35 0.82 02H SAI 13 35 0.32 05H SAI 13 43 0.18 02H 13 43 0.39 03H 13 59 0.44 03H 13 62 0.27 04H 13 63 0.21 02H 13 64 0.38 02H 13 64 0.32 08H 14 29 0.17 04H SAI 14 38 0.24 02H 14 39 0.18 05H 14 50 0.53 02H 14 54 0.35 02H 14 59 0.13 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-29 Comments Row Col Volts Location SAI/MAI NDF PLUG 14 59 0.16 04H 14 59 0.07 06H 14 70 0.18 08H 15 5 1.45 04H NDF 15 14 0.26 03H 15 35 0.14 02H 15 35 0.25 03H 15 38 0.35 04H SAI 15 39 0.64 02H 15 39 0.39 03H 15 61 0.2 02H 15 62 0.36 02H 15 80 0.19 03H 15 87 0.34 03H 16 15 0.38 03H 16 17 0.26 02H 16 45 0.94 06H 16 46 0.49 02H 16 46 0.55 04H 16 55 0.33 06H 16 57 0.6 03H 16 63 0.11 02H 16 73 0.27 02H 17 9 0.23 04H SAI 17 14 0.22 04H 17 17 0.24 02H 17 18 0.33 02H 17 24 0.09 04H 17 26 0.24 03H 17 35 0.67 03H SAI 17 38 0.22 02H 17 48 0.95 02H 17 49 0.26 02H 17 50 0.56 03H SAI 17 61 0.65 02H 17 61 0.3 03H 17 63 0.28 02H 17 66 0.53 02H 17 67 0.56 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-30 Comments Row Col Volts Location SAI/MAI NDF PLUG 17 68 0.34 02H 18 15 0.21 06H 18 47 0.41 03H 18 47 0.44 04H 18 48 0.39 02H 18 48 0.31 03H 18 48 0.49 04H 18 50 0.32 02H 18 51 0.29 02H 18 53 0.68 02H 18 54 0.49 02H 18 54 0.32 03H 18 55 0.3 02H 18 56 0.44 03H 18 59 0.2 03H 18 59 0.14 06H 18 61 0.3 04H 18 61 0.17 08H 18 62 0.39 02H 18 62 0.44 03H 18 62 0.17 04H 18 66 0.38 03H 18 67 0.43 02H 18 67 0.69 03H 18 73 0.17 03H 19 26 0.34 03H 19 29 0.45 02H 19 29 0.32 08H SAI 19 47 0.35 04H SAI 19 48 0.69 02H 19 48 0.65 03H 19 54 0.28 02H 19 57 0.45 04H 19 57 0.43 05H 19 79 0.82 02H 19 82 0.31 02H 19 89 0.14 06H 20 21 0.22 04H SAI 20 75 0.52 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-31 Comments Row Col Volts Location SAI/MAI NDF PLUG 20 76 0.41 02H SAI 20 76 1.09 03H NDF 20 78 0.34 04H SAI 20 85 0.25 03H 21 18 0.42 02H 21 18 0.4 03H 21 25 0.07 04H 21 62 0.37 02H 21 67 0.29 07H 22 18 0.41 02H 22 18 0.29 05H 22 20 0.51 02H 22 24 0.27 03H 22 33 0.27 02H 22 54 0.29 06H 22 61 0.25 03H 22 64 0.3 03H 22 75 0.29 04H SAI 22 77 0.2 03H 23 10 0.25 02H 23 28 0.55 03H 23 37 0.72 02H 23 39 0.26 02H 23 39 0.29 05H 23 42 0.27 02H 23 42 0.39 03H 23 69 0.17 03H 23 77 0.42 02H 23 77 0.26 03H 24 11 0.31 03H 24 34 0.44 08H 24 48 1.08 03H NDF 24 50 0.2 02H 24 56 0.35 03H 24 57 0.14 02H 24 61 0.39 02H 24 63 0.16 04H 24 79 0.78 02H 25 17 0.21 03H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-32 Comments Row Col Volts Location SAI/MAI NDF PLUG 25 26 0.11 04H 25 31 0.5 02H 25 33 0.2 08H 25 34 0.7 02H 25 34 0.45 03H 25 34 0.37 05H 25 47 0.48 03H 25 47 0.19 08H 25 54 0.15 02H 25 60 0.54 02H 25 61 0.45 02H 25 61 0.42 05H 25 62 0.46 04H 25 63 0.42 04H 25 65 0.34 02H NDF 25 65 0.21 07H SAI 25 71 0.36 06H 25 74 0.35 02H SAI 25 76 0.34 02H 25 76 0.28 05H 25 79 0.22 02H 26 24 0.17 06H 26 38 0.15 05H 26 39 0.26 05H 26 42 0.56 02H 26 44 0.28 06H 26 65 0.23 03H 26 70 1.12 03H NDF 26 72 0.23 08H 27 20 0.56 02H 27 22 0.21 02H 27 24 0.1 04H 27 31 0.63 02H 27 60 0.57 02H 27 69 0.35 02H 27 76 0.45 03H 27 79 0.23 02H 28 27 0.22 05H 28 35 0.63 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-33 Comments Row Col Volts Location SAI/MAI NDF PLUG 28 42 0.3 02H 28 42 0.12 04H 28 44 0.32 02H 28 44 0.16 03H 28 50 0.2 03H 28 70 0.34 08H 28 73 0.28 02H 28 73 0.14 03H 28 85 0.55 02H 29 11 0.39 05H 29 26 0.19 05H 29 29 0.99 03H 29 37 0.35 02H 29 38 0.17 05H 29 43 0.39 03H 29 47 0.17 02H 29 48 0.3 05H 29 57 0.2 05H 29 63 0.28 05H 30 12 0.16 03H 30 24 0.32 02H 30 25 0.11 04H 30 31 0.36 03H 30 31 0.25 04H 30 41 0.16 02H 30 60 0.51 02H 30 60 0.65 03H 30 60 0.22 04H 30 61 0.72 02H 30 61 0.43 04H SAI 30 62 0.2 04H 30 64 0.38 02H 30 64 0.45 04H SAI 31 14 0.14 05H 31 17 0.15 04H 31 22 0.18 02H 31 29 0.45 04H 31 49 0.17 02H 31 60 0.4 02H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-34 Comments Row Col Volts Location SAI/MAI NDF PLUG 31 61 0.24 03H 31 61 0.25 04H 31 62 0.59 03H 31 64 0.42 04H SAI 31 66 0.33 02H 31 66 0.53 03H 31 66 0.07 04H 31 66 0.3 05H 31 72 0.4 04H 31 75 0.3 02H SAI 31 77 0.21 06H 31 78 0.71 03H 31 78 0.62 04H 31 81 0.72 02H 31 81 0.51 03H 32 19 0.28 05H 32 25 0.18 03H 32 62 0.19 02H 32 63 0.41 03H SAI 32 63 0.21 04H 32 67 0.27 06H SAI 32 78 0.24 05H 33 34 0.25 06H 33 60 0.16 07H 33 60 0.18 08H 33 61 0.21 04H 33 75 0.25 05H 34 24 0.15 07H 34 39 0.13 05H 34 55 0.75 03H 34 58 0.51 02H 34 58 0.46 04H 34 58 0.3 05H 34 59 0.59 02H 35 22 0.19 02H 35 26 0.71 05H 35 34 0.15 03H 35 34 0.23 04H 35 38 0.11 07H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

A-35 Comments Row Col Volts Location SAI/MAI NDF PLUG 35 53 0.26 06H 36 20 0.55 03H 36 26 0.56 05H 36 27 0.19 05H 36 53 1.04 02H SAI 37 26 0.11 05H 37 35 0.12 03H 37 52 0.12 06H 38 42 0.27 05H 39 27 0.36 04H 40 25 0.13 03H 40 39 0.04 03H 40 53 0.34 04H 41 27 0.24 04H 41 44 0.35 04H 41 50 0.1 08H 41 63 0.56 02H 42 32 0.18 04H 46 41 0.21 07H SG-CDMP-20-15 July 2020 Revision 0

- - This record was final approved on 7/10/2020 4:02:45 3:28:12 PM. (This statement was added by the PRIME system upon its validation)

Enclosure B L-20-156 Unit #2 - 2R21 Steam Generator F* (F Star) Report (10 pages follow)

ENERGY HARBOR NUCLEAR Programs Engineering Unit Site Engineering Department Beaver Valley Power Station Issue Date: July 17, 2020

Subject:

Unit #2 - 2R21 Steam Generator F* (F Star) Report Prepared by: Gary Alberti Gary Alberti Date: 07/10/2020 Steam Generator Examination Program Owner Reviewed by: Brian Prinkey Brian Prinkey Date: 07/15/20 Supervisor, Programs Engineering Unit Approved by: Andrew Crotty Andrew Crotty Date: 07/17/20 Manager, Strategic Engineering

UNIT #2 - 2R21 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 2020 refueling outage (2R21), the initial entry into MODE 4 occurred on May 3, 2020.

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 2R21, the Plus Point probe was utilized to inspect the top of tubesheet (TTS) region in both the hot and cold legs. The 2R21 inspection scope included 100 percent of the in-service hot leg tubes in all three SGs plus a twenty percent random sample of the in-service cold leg tubes in 2RCS-SG21A.

The inspection distance for either 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 5.0 inches below the top of tubesheet to ensure the F* distance was adequately examined. On the cold leg side of 2RCS-SG21A, there are four tubes with a lower than nominal roll transition location. These tubes were not included in the 2R21 twenty percent random sample inspection of the cold leg tubesheet. However, these four tubes were included with the 2R21 special interest sample plan for cold leg tubesheet bulges and over-expansions.

The morphology for the majority 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 2R21 SG examinations represented a (Cycle 21) leakage potential at postulated main steam line break (MSLB) conditions nor did the 2R21 indications challenge the structural integrity performance criteria.

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 the 2.2 gallons per minute (gpm) per SG allowed by the Technical Specifications.

The information provided on the following pages summarizes the degradation observed during the 2R21 top of tubesheet region examinations.

2

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 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 - Single axial indication; 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" 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 2R21. 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.

2RCS-SG21A Hot Leg Tubesheet:

There were 56 indications in 56 tubes. 55 indications were located at or slightly below the top of tubesheet (45 were single circumferential ODSCC indications, 9 were multiple circumferential ODSCC indications and 1 was a single axial indication). The remaining 1 indication was located above the top of tubesheet (1 was a single circumferential indication).

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 30 TSH -0.06 SCI 0.06 229.2 OD/SCC Zero A 3 34 TSH -0.07 SCI 0.12 60.0 OD/SCC See Note 1 A 4 37 TSH -0.03 SCI 0.27 146.2 OD/SCC See Note 1 A 5 14 TSH -0.07 SCI 0.25 155.4 OD/SCC See Note 1 A 5 29 TSH -0.07 SCI 0.52 186.8 OD/SCC See Note 1 A 6 15 TSH -0.08 SCI 0.28 93.8 OD/SCC See Note 1 A 6 19 TSH -0.08 SCI 0.17 120.0 OD/SCC See Note 1 A 7 13 TSH -0.10 SCI 0.13 44.6 OD/SCC See Note 1 A 7 30 TSH -0.10 MCI 0.12 132.3 OD/SCC See Note 1 A 10 16 TSH -0.05 SCI 0.18 235.4 OD/SCC See Note 1 A 10 21 TSH -0.13 SCI 0.17 86.2 OD/SCC See Note 1 A 10 26 TSH -0.12 SCI 0.27 309.2 OD/SCC Zero A 10 34 TSH -0.08 SCI 0.11 153.8 OD/SCC See Note 1 A 10 38 TSH -0.09 MCI 0.06 211.4 OD/SCC See Note 1 A 11 24 TSH -0.08 SCI 0.20 89.2 OD/SCC See Note 1 A 11 43 TSH -0.10 SCI 0.15 26.2 OD/SCC See Note 1 3

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 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 12 40 TSH -0.11 SCI 0.08 252.3 OD/SCC Zero A 13 17 TSH -0.06 SCI 0.16 33.8 OD/SCC See Note 1 A 13 38 TSH -0.04 SCI 0.07 127.7 OD/SCC See Note 1 A 15 15 TSH -0.07 MCI 0.11 220.0 OD/SCC See Note 1 A 15 26 TSH -0.07 MCI 0.11 169.8 OD/SCC See Note 1 A 15 41 TSH -0.14 SCI 0.05 124.6 OD/SCC See Note 1 A 16 6 TSH -0.09 SCI 0.16 78.5 OD/SCC Zero A 16 38 TSH -0.05 SCI 0.17 244.6 OD/SCC See Note 1 A 16 44 TSH -0.17 SCI 0.15 89.2 OD/SCC See Note 1 A 19 28 TSH -0.13 SCI 0.15 224.6 OD/SCC See Note 1 A 19 32 TSH -0.09 MCI 0.18 149.2 OD/SCC See Note 1 A 20 11 TSH -0.09 SCI 0.23 158.5 OD/SCC Zero A 22 18 TSH -0.21 SCI 0.12 98.5 OD/SCC See Note 1 A 23 37 TSH -0.11 SCI 0.09 53.8 OD/SCC See Note 1 A 25 36 TSH -0.12 SCI 0.13 96.3 OD/SCC See Note 1 A 25 40 TSH -0.14 MCI 0.18 220.0 OD/SCC See Note 1 A 25 44 TSH -0.09 SCI 0.16 100.0 OD/SCC See Note 1 A 26 43 TSH -0.09 MCI 0.13 221.5 OD/SCC See Note 1 A 26 64 TSH -0.06 SCI 0.10 64.6 OD/SCC See Note 1 A 27 36 TSH -0.05 SCI 0.11 173.8 OD/SCC See Note 1 A 27 40 TSH -0.15 SCI 0.19 50.8 OD/SCC See Note 1 A 27 48 TSH -0.13 SCI 0.15 67.7 OD/SCC See Note 1 A 27 50 TSH -0.01 SCI 0.14 150.8 OD/SCC See Note 1 A 28 62 TSH -0.06 MCI 0.17 152.3 OD/SCC See Note 1 A 29 28 TSH -0.05 SAI 0.13 0.13 OD/SCC See Note 1 A 30 48 TSH -0.06 SCI 0.14 127.7 OD/SCC See Note 1 A 31 30 TSH -0.08 MCI 0.17 186.2 OD/SCC See Note 1 A 32 38 TSH -0.08 SCI 0.18 112.3 OD/SCC See Note 1 A 33 63 TSH 0.02 SCI 0.09 52.3 OD/SCC See Note 1 A 33 64 TSH -0.07 SCI 0.19 181.5 OD/SCC See Note 1 A 34 25 TSH -0.08 SCI 0.20 181.5 OD/SCC Zero A 34 32 TSH -0.05 SCI 0.18 118.5 OD/SCC See Note 1 A 34 49 TSH -0.08 SCI 0.18 133.8 OD/SCC See Note 1 A 34 70 TSH -0.08 SCI 0.32 201.5 OD/SCC Zero A 35 33 TSH 0.00 SCI 0.15 136.9 OD/SCC See Note 1 A 35 65 TSH -0.03 SCI 0.21 80.0 OD/SCC Zero A 36 43 TSH -0.09 SCI 0.25 184.6 OD/SCC See Note 1 A 39 60 TSH -0.02 SCI 0.22 44.6 OD/SCC Zero A 40 55 TSH -0.08 SCI 0.11 196.9 OD/SCC Zero A 40 58 TSH -0.06 SCI 0.11 98.5 OD/SCC Zero 4

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 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 291 Alloy 800 tubesheet sleeves installed, this equates to 2.6336 x 10-3 gpm and 4.1856 x 10-3 gpm, respectively.

2RCS-SG21A Cold Leg Tubesheet:

A twenty percent random sample of the in-service cold leg tubes in 2RCS-SG21A was performed from 6 inches above to 3 inches below the TTS. No tubes with roll expansions greater than 0.75 inches below the top of tubesheet were included in the random sample, therefore no tubes were required to be inspected to a depth of greater than 3.0 inches. No indications were detected during the cold leg twenty percent random sample inspection in 2RCS-SG21A however, 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 34% through wall and remains in-service.

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 -0.11 VOL 0.31 0.24 58.0 OD/Wear Zero 5

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21B Hot Leg Tubesheet:

There were 21 indications in 21 tubes. 18 indications were located at or slightly below the top of tubesheet (16 were single circumferential ODSCC indications and 2 were multiple circumferential ODSCC indications). 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-SG21B Indication Location Severity Initiation Projected Orientation Axial Arc Surface/ EOC SG Row Column Elevation Volts (Inches) Length Length Degradation Leakage (Inches) (Degrees)

B 6 41 TSH 0.51 SAI 0.09 0.13 OD/SCC See Note 1 B 7 51 TSH -0.10 SCI 0.17 103.1 OD/SCC See Note 1 B 7 59 TSH -0.08 MCI 0.11 121.2 OD/SCC See Note 1 B 9 63 TSH 0.02 SCI 0.10 30.8 OD/SCC See Note 1 B 18 14 TSH 0.00 SCI 0.17 113.8 OD/SCC See Note 1 B 21 35 TSH -0.07 SCI 0.12 115.3 OD/SCC See Note 1 B 22 32 TSH -0.13 SCI 0.05 187.7 OD/SCC See Note 1 B 23 25 TSH 0.02 SAI 0.28 0.16 OD/SCC See Note 1 B 23 37 TSH -0.03 SCI 0.15 101.7 OD/SCC See Note 1 B 25 30 TSH -0.05 SCI 0.08 121.5 OD/SCC See Note 1 B 25 54 TSH -0.01 SCI 0.14 132.3 OD/SCC See Note 1 B 27 50 TSH -0.07 SCI 0.10 87.7 OD/SCC See Note 1 B 30 34 TSH -0.03 SCI 0.11 72.3 OD/SCC See Note 1 B 30 56 TSH -0.03 SCI 0.23 81.5 OD/SCC See Note 1 B 30 65 TSH -0.14 SCI 0.09 153.8 OD/SCC See Note 1 B 31 32 TSH -0.07 SCI 0.13 164.6 OD/SCC See Note 1 B 31 44 TSH -0.04 SCI 0.12 70.8 OD/SCC See Note 1 B 31 58 TSH -0.05 SCI 0.20 107.7 OD/SCC See Note 1 B 32 59 TSH -0.05 SCI 0.08 200.3 OD/SCC See Note 1 B 33 56 TSH -0.05 SCI 0.20 204.6 OD/SCC See Note 1 B 35 36 TSH -0.04 MCI 0.23 170.8 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 190 Alloy 800 tubesheet sleeves installed, this equates to 1.7195 x 10-3 gpm and 2.7328 x 10-3 gpm, respectively.

6

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21B Cold Leg Tubesheet:

One tube was reported with two dings with possible indication (DNI) signals above the TTS from the full length bobbin coil program. The DNI signals in Row 9 Column 80 were re-examined with the +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 14% 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 +Point probe and sized at 13% 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)

TSC 1.51 DNI 0.30 OD Zero B 9 80 TSC 1.60 DNI 0.31 OD Zero TSC 0.41 VOL 0.09 0.26 58 OD/Wear Zero B 19 83 TSC 1.45 VOL 0.06 0.25 52 OD/Wear Zero B 36 27 TSC 0.20 VOL 0.09 0.25 57 OD/Wear Zero 7

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21C Hot Leg Tubesheet:

There were 23 indications in 23 tubes. 21 indications were located at or slightly below the top of tubesheet (17 were single circumferential ODSCC indications and 4 were multiple circumferential ODSCC indications). The remaining 2 indications were located above the top of tubesheet (2 were single circumferential ODSCC indications).

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 28 TSH -0.11 SCI 0.13 135.4 OD/SCC See Note 1 C 4 54 TSH 0.04 SCI 0.17 170.8 OD/SCC See Note 1 C 4 55 TSH -0.09 SCI 0.13 143.1 OD/SCC See Note 1 C 5 31 TSH -0.07 SCI 0.19 215.4 OD/SCC See Note 1 C 5 58 TSH -0.07 SCI 0.09 96.9 OD/SCC See Note 1 C 8 26 TSH -0.10 SCI 0.09 81.5 OD/SCC See Note 1 C 8 35 TSH -0.05 SCI 0.11 206.2 OD/SCC See Note 1 C 8 54 TSH -0.10 MCI 0.12 273.8 OD/SCC See Note 1 C 9 48 TSH -0.08 SCI 0.11 58.5 OD/SCC See Note 1 C 11 43 TSH -0.08 SCI 0.08 58.5 OD/SCC See Note 1 C 16 34 TSH -0.07 MCI 0.10 227.0 OD/SCC See Note 1 C 17 38 TSH -0.11 MCI 0.06 155.6 OD/SCC See Note 1 C 18 70 TSH -0.11 SCI 0.14 78.5 OD/SCC See Note 1 C 19 40 TSH -0.04 MCI 0.06 193.1 OD/SCC See Note 1 C 19 47 TSH -0.11 SCI 0.07 173.5 OD/SCC See Note 1 C 19 52 TSH 0.01 SCI 0.15 100.0 OD/SCC See Note 1 C 20 22 TSH -0.03 SCI 0.11 95.4 OD/SCC See Note 1 C 24 38 TSH -0.08 SCI 0.11 101.5 OD/SCC See Note 1 C 25 34 TSH -0.03 SCI 0.15 107.7 OD/SCC See Note 1 C 28 70 TSH -0.05 SCI 0.14 49.2 OD/SCC See Note 1 C 29 47 TSH 0.00 SCI 0.22 130.8 OD/SCC See Note 1 C 30 24 TSH -0.04 SCI 0.08 62.2 OD/SCC See Note 1 C 31 68 TSH -0.03 SCI 0.09 64.6 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 86 Alloy 800 tubesheet sleeves installed, this equates to 7.7830 x 10-4 gpm and 1.2370 x 10-3 gpm, respectively.

8

UNIT #2 - 2R21 STEAM GENERATOR F* (F STAR) REPORT 2RCS-SG21C 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 24 Column 84 was sized at 29% 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 +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 0.03 VOL 0.31 0.34 66 OD/Wear Zero C 26 26 TSC -5.01 DTI 6.21 OD Zero 9

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

(Updated through 2R21) 2RCS-SG21A 2RCS-SG21A 2RCS-SG21B 2RCS-SG21B 2RCS-SG21C 2RCS-SG21C Hot Leg Tubesheet Cold Leg Tubesheet Hot Leg Tubesheet Cold Leg Tubesheet Hot Leg Tubesheet Cold Leg Tubesheet INCH COUNT INCH COUNT INCH COUNT INCH COUNT INCH COUNT INCH COUNT 0.00" 84 0.00" 0.00" 50 0.00" 0.00" 23 0.00"

- 0.01" 21 - 0.01" - 0.01" 14 - 0.01" - 0.01" 3 - 0.01"

- 0.02" 20 - 0.02" - 0.02" 9 - 0.02" - 0.02" 3 - 0.02"

- 0.03" 31 - 0.03" - 0.03" 22 - 0.03" - 0.03" 8 - 0.03"

- 0.04" 29 - 0.04" - 0.04" 22 - 0.04" - 0.04" 14 - 0.04"

- 0.05" 29 - 0.05" 1 - 0.05" 26 - 0.05" - 0.05" 19 - 0.05"

- 0.06" 36 - 0.06" - 0.06" 18 - 0.06" - 0.06" 16 - 0.06"

- 0.07" 34 - 0.07" - 0.07" 24 - 0.07" - 0.07" 16 - 0.07"

- 0.08" 33 - 0.08" - 0.08" 34 - 0.08" - 0.08" 23 - 0.08"

- 0.09" 31 - 0.09" - 0.09" 27 - 0.09" - 0.09" 17 - 0.09"

- 0.10" 23 - 0.10" - 0.10" 21 - 0.10" - 0.10" 18 - 0.10"

- 0.11" 32 - 0.11" 1 - 0.11" 19 - 0.11" - 0.11" 17 - 0.11"

- 0.12" 9 - 0.12" - 0.12" 11 - 0.12" - 0.12" 9 - 0.12"

- 0.13" 23 - 0.13" - 0.13" 4 - 0.13" - 0.13" 5 - 0.13"

- 0.14" 14 - 0.14" - 0.14" 3 - 0.14" - 0.14" 6 - 0.14"

- 0.15" 7 - 0.15" - 0.15" 8 - 0.15" - 0.15" 1 - 0.15"

- 0.16" 7 - 0.16" 1 - 0.16" 3 - 0.16" - 0.16" 4 - 0.16"

- 0.17" 7 - 0.17" - 0.17" 3 - 0.17" - 0.17" 1 - 0.17"

- 0.18" - 0.18" - 0.18" 4 - 0.18" - 0.18" 2 - 0.18"

- 0.19" 2 - 0.19" - 0.19" - 0.19" - 0.19" 1 - 0.19"

- 0.20" 2 - 0.20" - 0.20" 2 - 0.20" - 0.20" - 0.20"

- 0.21" 1 - 0.21" 3 - 16.39" 1 - 0.22" 1 - 5.01" 1

- 0.22" - 0.22" 2 - 0.36" 1 - 5.29" 1

- 0.23" 1 - 0.26" 1 - 0.40" 1

- 0.27" 1 - 0.41" 1

- 0.31" 1 - 0.50" 1

- 0.48" 1 - 1.22" 1

- 1.49" 1 The six shaded tube locations were reported as a distorted tubesheet signal from the bobbin coil - 3.16" 1 probe. Rotating pancake coil examinations did not confirm any of these signal as real indications. - 18.36" 1 TOTAL 476 TOTAL 3 TOTAL 333 TOTAL 1 TOTAL 215 TOTAL 2 10

v t e Letter Sequence Request
EPID:L-2020-LRO-0042, Steam Generator Inspection Reports - Spring 2020 Refueling Outage (Approved, Closed)
Initiation Request Acceptance... Administration Questions Answers Results Approval Other:
MONTHYEAR2020-07-28 [Table View]

L-20-156, Steam Generator Inspection Reports - Spring 2020 Refueling Outage

Text

Subject:

Enclosures:

SUMMARY

SUMMARY

Subject:

Navigation menu

L-20-156, Steam Generator Inspection Reports - Spring 2020 Refueling Outage

Text

Subject:

Enclosures:

SUMMARY

SUMMARY

Subject:

Navigation menu

Search