SBK-L-21106, Transmittal of WCAP-18607-NP, Analysis of Capsule X from the NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program

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Transmittal of WCAP-18607-NP, Analysis of Capsule X from the NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program
ML21277A388
Person / Time
Site: Seabrook NextEra Energy icon.png
Issue date: 09/30/2021
From: Levander M
NextEra Energy Seabrook
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
SBK-L-21106
Download: ML21277A388 (284)
v • d • e


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{{#Wiki_filter:September 30, 2021 SBK-L-21106 10 CFR 50, Appendix H U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington DC 20555-0001 RE: Seabrook Station Docket No. 50-443 Renewed Facility Operating License No. NPF-86 Transmittal of WCAP-18607-NP, Analysis of Capsule X from the NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program

References:

1. NextEra Energy Seabrook, LLC, letter SBK-L-14102, Supplemental Information for License Amendment Request 14-04 Revised Reactor Coolant System Pressure - Temperature Limits Applicable for 55 Effective Full Power Years, July 20, 2015 (ADAMS Accession No. ML14216A404)
2. WCAP-17441-NP, Revision 0, Seabrook Unit 1 Heat-up and Cooldown Limit Curves for Normal Operation, October 2011, (ADAMS Accession No. ML12341A096)

In accordance with 10 CFR Part 50, Appendix H, Reactor Vessel Material Surveillance Program Requirements, paragraph IV.A, NextEra Energy Seabrook, LLC (NextEra) hereby submits WCAP-18607-NP, Rev. 0 "Analysis of Capsule X from NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program". The report provides the Seabrook Station Unit 1 (Seabrook) fluence and mechanical test results, including the nil ductility transition temperature shifts (RTNDT) and the upper shelf energy values for the reactor vessel plate, weld, and heat affected zone materials that were contained in capsule X. The report also includes updated fluence values for capsules U, Y and V as well as future fluence projections for the reactor vessel. The embrittlement calculations in WCAP-18607-NP for the non-limiting beltline welds include updated chemistry values compared to those reported in Reference 1. WCAP-18607-NP, Rev. 0, is provided in the Attachment to this letter. Appendix D of WCAP-18607-NP concludes that the adjusted RTNDT values for the Seabrook reactor vessel materials, based on the surveillance capsule data, are within Regulatory Guide 1.99 Revision 2 predictions and are deemed credible. WCAP-18607-NP evaluated the capsule X dosimetry to provide updated future fluence projections and reported a peak clad/base metal fluence at 55 effective full power years (EFPY) of 3.19x1019 n/cm2, which is slightly higher than the 3.05x1019 n/cm2 used in the current 55 EFPY Technical Specification (TS) Pressure-Temperature (PT) limit curves and Low Temperature Overpressure Protection (LTOP) analysis (WCAP-17441-NP, Reference 2), resulting in an impact to the period of applicability. WCAP-17441-NP provided the basis for the current 55 EFPY PT limit curves. Using the same 1/4T and 3/4T adjusted RTNDT values of 117°F & 105°F, respectively, and maximum vessel fluence for the limiting intermediate plate R1808-1, the fluence and adjusted RTNDT values are reached at 52.6 EFPY using the new fluence projections. Since both the PT limits and LTOP analysis are based on the same limiting material properties, the PT curves and LTOP analysis remain applicable, however, the period of applicability is reduced from 55 EFPY to 52.6 EFPY. The current 55 EFPY PT limit curves remain conservative and valid with margin since Seabrook was at 26.46 EFPY at the end of cycle 20 (Spring 2020). Within one year from the date of this letter, a license amendment request (LAR) will be submitted for an administrative change to Technical Specification (TS) Figures 3.4-2, 3.4-3 and 3.4-4, which depict the current 55 EFPY limit in their respective titles. The change in the period of applicability for TS Figures 3.4-2, 3.4-3 and 3.4-4 is being tracked in the Seabrook corrective action program (CAP). NextEra Energy Seabrook, LLC P.O. Box 300, Lafayette Road, Seabrook, NH 03874

Seabrook Station SBK-L-21106 Docket Nos. 50-443 Page 2 of 2 Should you have any questions regarding this submission, please contact Mr. Joshua Greene, Seabrook Licensing at 603-773-7851. ~* Matthew Levander Licensing Manager - Seabrook Nuclear Power Station NextEra Energy Attachment cc: USNRC Region I Administrator USNRC Project Manager USNRC Senior Resident Inspector Director Homeland Security and Emergency Management New Hampshire Department of Safety Division of Homeland Security and Emergency Management Bureau of Emergency Management 33 Hazen Drive Concord, NH 03305 Director Massachusetts Emergency Management Agency The Commonwealth of Massachusetts Emergency Management Agency 400 Worcester Road Framingham, MA 01702-5399

Seabrook Station SBK-L-21106 Docket Nos. 50-443 ATTACHMENT WCAP-18607-NP, ANALYSIS OF CAPSULE X FROM THE NEXTERA ENERGY SEABROOK UNIT 1 REACTOR VESSEL RADIATION SURVEILLANCE PROGRAM (281 pages follow)

Westinghouse Non-Proprietary Class 3 WCAP-18607-NP March 2021 Revision 0 Analysis of Capsule X from the NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 WCAP-18607-NP Revision 0 Analysis of Capsule X from the NextEra Energy Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program Benjamin E. Mays* License Renewal, Radiation Analysis, and Nuclear Operations Eugene T. Hayes* Radiation Engineering & Analysis March 2021 Reviewers: D. Brett Lynch* Reactor Vessel/Containment Vessel (RV/CV) Design & Analysis Stanwood L. Anderson* Radiation Engineering & Analysis Approved: Lynn A. Patterson*, Manager RV/CV Design & Analysis Jesse J Klingensmith*, Manager Radiation Engineering & Analysis

  • Electronically approved records are authenticated in the electronic document management system.

Westinghouse Electric Company LLC 1000 Westinghouse Drive Cranberry Township, PA 16066, USA 

                                       © 2021 Westinghouse Electric Company LLC All Rights Reserved
*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 ii TABLE OF CONTENTS LIST OF TABLES ....................................................................................................................................... iii LIST OF FIGURES ..................................................................................................................................... vi EXECUTIVE

SUMMARY

........................................................................................................................ viii 1

SUMMARY

OF RESULTS ................................................................................................................. 1-1 2 INTRODUCTION ............................................................................................................................... 2-1 3 BACKGROUND ................................................................................................................................. 3-1 4 DESCRIPTION OF PROGRAM ........................................................................................................ 4-1 5 TESTING OF SPECIMENS FROM CAPSULE X ............................................................................ 5-1 5.1 OVERVIEW .................................................................................................................... 5-1 5.2 CHARPY V-NOTCH IMPACT TEST RESULTS ........................................................... 5-2 5.3 TENSILE TEST RESULTS ............................................................................................. 5-4 5.4 COMPACT TENSION SPECIMEN TEST RESULTS.................................................... 5-4 6 RADIATION ANALYSIS AND NEUTRON DOSIMETRY.............................................................. 6-1

6.1 INTRODUCTION

........................................................................................................... 6-1 6.2      DISCRETE ORDINATES ANALYSIS ........................................................................... 6-1 6.3      NEUTRON DOSIMETRY .............................................................................................. 6-4 6.4      CALCULATIONAL UNCERTAINTIES ........................................................................ 6-4 7 SURVEILLANCE CAPSULE REMOVAL SCHEDULE................................................................... 7-1 8 REFERENCES .................................................................................................................................... 8-1 APPENDIX A VALIDATION OF THE RADIATION TRANSPORT MODELS BASED ON NEUTRON DOSIMETRY MEASUREMENTS ................................................................................ A-1 APPENDIX B LOAD-TIME RECORDS FOR CHARPY SPECIMEN TESTS FROM CAPSULE X .......
                    ........................................................................................................................................ B-1 APPENDIX C CHARPY V-NOTCH PLOTS FOR EACH CAPSULE INCLUDING BASELINE DATA USING SYMMETRIC HYPERBOLIC TANGENT CURVE-FITTING METHOD ..... C-1 APPENDIX D SEABROOK UNIT 1 SURVEILLANCE PROGRAM CREDIBILITY EVALUATION ....
                    ........................................................................................................................................ D-1 WCAP-18607-NP                                                                                                                                     March 2021 Revision 0
*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 iii LIST OF TABLES Table 4-1 Chemical Composition (wt. %) of the Seabrook Unit 1 Reactor Vessel Surveillance Materials (Unirradiated)................................................................................................... 4-3 Table 4-2 Heat Treatment History of the Seabrook Unit 1 Reactor Vessel and Surveillance Materials 

                    ......................................................................................................................................... 4-4 Table 5-1           Charpy V-notch Data for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Longitudinal Orientation) ........................ 5-5 Table 5-2           Charpy V-notch Data for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Transverse Orientation) ........................... 5-6 Table 5-3           Charpy V-notch Data for the Seabrook Unit 1 Surveillance Program Weld Material (Heat
                   # 4P6052) Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) .......................... 5-7 Table 5-4           Charpy V-notch Data for the Seabrook Unit 1 Heat-Affected Zone (HAZ) Material Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) ............................................ 5-8 Table 5-5           Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV)

(Longitudinal Orientation) ............................................................................................... 5-9 Table 5-6 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Transverse Orientation) ................................................................................................ 5-10 Table 5-7 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Surveillance Program Weld Material (Heat # 4P6052) Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) 

                    ....................................................................................................................................... 5-11 Table 5-8           Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Heat-Affected Zone (HAZ) Material Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV)................ 5-12 Table 5-9           Effect of Irradiation to 6.03 x 1019 n/cm2 (E > 1.0 MeV) on the Charpy V-Notch Toughness Properties of the Seabrook Unit 1 Reactor Vessel Surveillance Capsule X Materials ... 5-13 Table 5-10          Comparison of the Seabrook Unit 1 Surveillance Material 30 ft-lb Transition Temperature Shifts and Upper-Shelf Energy Decreases with Regulatory Guide 1.99, Revision 2, Predictions ..................................................................................................................... 5-14 Table 5-11          Tensile Properties of the Seabrook Unit 1 Capsule X Reactor Vessel Surveillance Materials Irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV)............................................................... 5-15 Table 6-1           Calculated Fast (E > 1.0 MeV) Neutron Fluence Rate and Fluence at Surveillance Capsule Locations.......................................................................................................................... 6-7 Table 6-2           Calculated Iron Atom Displacement Rate and Iron Atom Displacements at Surveillance Capsule Locations ............................................................................................................ 6-9 Table 6-3           Calculated Surveillance Capsule Lead Factors .............................................................. 6-11 WCAP-18607-NP                                                                                                                                     March 2021 Revision 0
*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 iv Table 6-4 Calculated Maximum Fast (E > 1.0 MeV) Neutron Fluence Rate at the Pressure Vessel Clad/Base Metal Interface.............................................................................................. 6-12 Table 6-5 Calculated Maximum Fast (E > 1.0 MeV) Neutron Fluence at the Pressure Vessel Clad/Base Metal Interface.............................................................................................. 6-13 Table 6-6 Calculated Maximum Iron Atom Displacement Rate at the Pressure Vessel Clad/Base Metal Interface ............................................................................................................... 6-14 Table 6-7 Calculated Maximum Iron Atom Displacements at the Pressure Vessel Clad/Base Metal Interface ......................................................................................................................... 6-15 Table 6-8 Calculated Maximum Fast Neutron Fluence (E > 1.0 MeV) at Pressure Vessel Welds and Shells.............................................................................................................................. 6-16 Table 6-9 Calculated Maximum Iron Atom Displacements at Pressure Vessel Welds and Shells . 6-18 Table 7-1 Surveillance Capsule Withdrawal Schedule .................................................................... 7-1 Table A-1 Nuclear Parameters Used in the Evaluation of Neutron Sensors .................................... A-9 Table A-2 Monthly Thermal Generation at Seabrook Unit 1 Cycles 11 through 20 ..................... A-10 Table A-2 Monthly Thermal Generation at Seabrook Unit 1 Cycles 11 through 20 (cont.) .......... A-11 Table A-3 Measured Sensor Activities and Reaction Rates for Surveillance Capsule U .............. A-12 Table A-4 Measured Sensor Activities and Reaction Rates for Surveillance Capsule Y .............. A-13 Table A-5 Measured Sensor Activities and Reaction Rates for Surveillance Capsule V .............. A-14 Table A-6 Measured Sensor Activities and Reaction Rates for Surveillance Capsule X .............. A-15 Table A-7 Least-Squares Evaluation of Dosimetry in Surveillance Capsule U (Dual 31.5° Position, Core Midplane, Irradiated During Cycle 1) .................................................................. A-16 Table A-8 Least-Squares Evaluation of Dosimetry in Surveillance Capsule Y (Dual 29° Position, Core Midplane, Irradiated During Cycles 1 through 5) ......................................................... A-17 Table A-9 Least-Squares Evaluation of Dosimetry in Surveillance Capsule V (Dual 29° Position, Core Midplane, Irradiated During Cycles 1 through 10) ....................................................... A-18 Table A-10 Least-Squares Evaluation of Dosimetry in Surveillance Capsule X (Dual 31.5° Position, Core Midplane, Irradiated During Cycles 1 through 20) .............................................. A-19 Table A-11 Measured-to-Calculated (M/C) Reaction Rates - In-Vessel Capsules.......................... A-20 Table A-12 Best-Estimate-to-Calculated (BE/C) Exposure Rates - In-Vessel Capsules................. A-20 Table C-1 Upper-Shelf Energy Values (ft-lb) Fixed in CVGRAPH ................................................ C-2 Table D-1 Calculation of Interim Chemistry Factors for the Credibility Evaluation Using Seabrook Unit 1 Surveillance Data Only ........................................................................................ D-3 Table D-2 Best-Fit Evaluation For Seabrook Unit 1 Surveillance Materials Only .......................... D-4 Table D-3 Mean Chemical Composition and Temperature for Weld Heat # 4P6052 ...................... D-5 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 v Table D-4 Calculation of Interim Chemistry Factor for the Credibility Evaluation for Heat # 4P6052 using Data from Seabrook Unit 1 and Millstone Unit 3 ................................................. D-6 Table D-5 Best-Fit Evaluation For Heat # 4P6052 Considering Millstone Unit 3 and Seabrook Unit 1 Data ................................................................................................................................. D-7 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 vi LIST OF FIGURES Figure 4-1 Arrangement of Surveillance Capsules in the Seabrook Unit 1 Reactor Vessel .............. 4-5 Figure 4-2 Specimen Locations in the Seabrook Unit 1 Surveillance Capsule X per WCAP-10110 

                    ......................................................................................................................................... 4-6 Figure 5-1          Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) ............................................................ 5-16 Figure 5-2          Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) ................................................ 5-18 Figure 5-3          Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) ............................................................ 5-20 Figure 5-4          Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) ............................................................... 5-22 Figure 5-5          Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) .................................................... 5-24 Figure 5-6          Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) ............................................................... 5-26 Figure 5-7          Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052).................................................. 5-28 Figure 5-8          Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052).................................................. 5-30 Figure 5-9          Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052).................................................. 5-32 Figure 5-10         Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material .................................................................................................. 5-34 Figure 5-11         Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material ......................................................................................... 5-36 Figure 5-12         Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material .................................................................................................. 5-38 Figure 5-13         Charpy Impact Specimen Fracture Surfaces for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) ............................................................ 5-40 Figure 5-14         Charpy Impact Specimen Fracture Surfaces for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) ............................................................... 5-41 Figure 5-15         Charpy Impact Specimen Fracture Surfaces for the Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052).................................................. 5-42 Figure 5-16         Charpy Impact Specimen Fracture Surfaces for the Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material .................................................................................................. 5-43 Figure 5-17         Tensile Properties for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) ............................................................................................. 5-44 Figure 5-18         Tensile Properties for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) ................................................................................................ 5-45 WCAP-18607-NP                                                                                                                                     March 2021 Revision 0
*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 vii Figure 5-19 Tensile Properties for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) ............................................................................................................. 5-46 Figure 5-20 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) .............................................................................. 5-47 Figure 5-21 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) ................................................................................. 5-48 Figure 5-22 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) ..................................................................................... 5-49 Figure 5-23 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL10, Tested at 76°F ................................................................................................................ 5-50 Figure 5-24 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL11, Tested at 200°F .............................................................................................................. 5-50 Figure 5-25 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL12, Tested at 560°F .............................................................................................................. 5-50 Figure 5-26 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT10, Tested at 76°F ................................................................................................................ 5-51 Figure 5-27 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT11, Tested at 150°F .............................................................................................................. 5-51 Figure 5-28 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT12, Tested at 560°F .............................................................................................................. 5-51 Figure 5-29 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW10, Tested at 76°F ................................................................................................................ 5-52 Figure 5-30 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW11, Tested at 200°F .............................................................................................................. 5-52 Figure 5-31 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW12, Tested at 560°F .............................................................................................................. 5-52 Figure 6-1 Seabrook Unit 1 Plan View of the Reactor Geometry at the Core Midplane Single Surveillance Capsule Configuration .............................................................................. 6-20 Figure 6-2 Seabrook Unit 1 Plan View of the Reactor Geometry at the Core Midplane Dual Surveillance Capsule Configuration .............................................................................. 6-21 Figure 6-3 Seabrook Unit 1 Section View of the Reactor Geometry at 0-Degrees ......................... 6-22 Figure 6-4 Seabrook Unit 1 Section View of the Reactor Geometry at 22-Degrees ....................... 6-23 Figure 6-5 Seabrook Unit 1 Section View of the Reactor Geometry at 67-Degrees ....................... 6-24 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 viii EXECUTIVE

SUMMARY

The purpose of this report is to document the testing results of surveillance Capsule X from Seabrook Unit 1. Capsule X was removed at 26.46 effective full-power years (EFPY) and post-irradiation mechanical tests of the Charpy V-notch and tensile specimens were performed. A fluence evaluation utilizing the neutron transport and dosimetry cross-section libraries was derived from the Evaluated Nuclear Data File (ENDF) database (specifically, ENDF/B-VI). Capsule X received a fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) after irradiation to 26.46 EFPY. The peak clad/base metal interface vessel fluence after 55 EFPY (end-of-license extension) of plant operation is projected to be 3.19 x 1019 n/cm2 (E > 1.0 MeV). This evaluation led to the following conclusions: (1) The measured shifts in the 30 ft-lb transition temperature of the surveillance plate materials (longitudinal and transverse) contained in Seabrook Unit 1 Capsule X are higher than the Regulatory Guide 1.99, Revision 2 [1] predictions, while the surveillance weld material shift is less than the Regulatory Guide 1.99, Rev. 2 prediction. (2) The measured percent decreases in upper-shelf energy for the surveillance plate and weld materials contained in Seabrook Unit 1 Capsule X are less than the Regulatory Guide 1.99, Rev. 2 predictions. (3) The Seabrook Unit 1 surveillance plate and surveillance weld (Heat # 4P6052) data are deemed to be credible. This credibility evaluation can be found in Appendix D. Lastly, a brief summary of the Charpy V-notch testing can be found in Section 1. All Charpy V-notch data was plotted using a symmetric hyperbolic tangent curve-fitting program. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 1-1 1

SUMMARY

OF RESULTS The analysis of the reactor vessel materials contained in surveillance Capsule X, the fourth capsule removed and tested from the Seabrook Unit 1 reactor pressure vessel, led to the following conclusions: Charpy V-notch test data were plotted using a symmetric hyperbolic tangent curve-fitting program. Appendix C presents the CVGRAPH, Version 6.02, Charpy V-notch plots for Capsule X, along with data from the program baseline and previous capsules. Capsule X received an average fast neutron fluence (E > 1.0 MeV) of 6.03 x 1019 n/cm2 after 26.46 effective full-power years (EFPY) of plant operation. Irradiation of the reactor vessel Lower Shell Plate R1808-3 Charpy specimens, oriented with the longitudinal axis of the specimen parallel to the major rolling direction (longitudinal orientation), resulted in an irradiated 30 ft-lb transition temperature of 44.4F. This results in a 30 ft-lb transition temperature increase of 72.5F for the longitudinally oriented specimens. Irradiation of the reactor vessel Lower Shell Plate R1808-3 Charpy specimens, oriented with the longitudinal axis of the specimen perpendicular to the major rolling direction (transverse orientation), resulted in an irradiated 30 ft-lb transition temperature of 109.8F. This results in a 30 ft-lb transition temperature increase of 100.8F for the transversely oriented specimens. Irradiation of the surveillance program weld material (Heat # 4P6052, Flux Type 0091, Flux Lot 

     # 0145) Charpy specimens resulted in an irradiated 30 ft-lb transition temperature of -40.8F. This results in a 30 ft-lb transition temperature increase of 33.8F.

Irradiation of the heat-affected zone (HAZ) material Charpy specimens resulted in an irradiated 30 ft-lb transition temperature of -21.9F. This results in a 30 ft-lb transition temperature increase of 171.8F. The average upper-shelf energy of Lower Shell Plate R1808-3 (longitudinal orientation) resulted in an average energy decrease of 10 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 115 ft-lb for the longitudinally oriented specimens. The average upper-shelf energy of Lower Shell Plate R1808-3 (transverse orientation) resulted in an average energy decrease of 9 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 70 ft-lb for the transversely oriented specimens. The average upper-shelf energy of the surveillance program weld material (Heat # 4P6052) Charpy specimens resulted in an average energy decrease of 36 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 124 ft-lb for the weld metal specimens. It is noted that none of the weld material Charpy specimens exhibited shear > 95%. Thus, this estimate of upper-shelf energy decrease is considered conservative. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 1-2 The average upper-shelf energy of the HAZ material Charpy specimens resulted in an average energy decrease of 12 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 118 ft-lb for the HAZ material. Comparisons of the measured 30 ft-lb shift in transition temperature values and upper-shelf energy decreases to those predicted by Regulatory Guide 1.99, Rev. 2 [1] for the Seabrook Unit 1 reactor vessel surveillance materials are presented in Table 5-10. Based on the credibility evaluation presented in Appendix D, the Seabrook Unit 1 surveillance plate and surveillance weld material (Heat # 4P6052) data are deemed credible. The maximum calculated 55 EFPY (end-of-license) neutron fluence (E > 1.0 MeV) for the Seabrook Unit 1 reactor vessel beltline using the Regulatory Guide 1.99, Rev. 2 [1] attenuation formula (i.e., Equation # 3 in the Guide) is as follows: Calculated (55 EFPY): Vessel peak clad/base metal interface fluence* = 3.19 x 1019 n/cm2 Vessel peak quarter-thickness (1/4T) fluence = 1.90 x 1019 n/cm2 Vessel peak three-quarter thickness (3/4T) fluence = 6.74 x 1018 n/cm2 

                                       *This fluence value is determined from data in Table 6-5.

WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 2-1 2 INTRODUCTION This report presents the results of the examination of Capsule X, the fourth capsule removed and tested in the continuing surveillance program, which monitors the effects of neutron irradiation on the NextEra Energy Seabrook Unit 1 reactor pressure vessel materials under actual operating conditions. The surveillance program for the Seabrook Unit 1 reactor pressure vessel materials was designed and recommended by Westinghouse Electric Company LLC. A detailed description of the surveillance program is contained in WCAP-10110 [2], Public Service Company of New Hampshire Seabrook Station Unit No. 1 Reactor Vessel Radiation Surveillance Program. The surveillance program was originally planned to cover the 40-year design life of the reactor pressure vessel and was based on ASTM E185-79 [3], Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels. Capsule X was removed from the reactor after 26.46 EFPY of exposure and shipped to the Westinghouse Churchill Laboratory, where the post-irradiation mechanical testing of the Charpy V-notch impact and tensile surveillance specimens was performed. This report summarizes the testing and post-irradiation data obtained from surveillance Capsule X removed from the Seabrook Unit 1 reactor vessel and presents the analysis of the data. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 3-1 3 BACKGROUND The ability of the large steel pressure vessel containing the reactor core and its primary coolant to resist fracture constitutes an important factor in ensuring safety in the nuclear industry. The beltline region of the reactor pressure vessel is the most critical region of the vessel because it is subjected to significant fast neutron bombardment. The overall effects of fast neutron irradiation on the mechanical properties of low-alloy, ferritic pressure vessel steels such as SA533 Grade B-1 (base material of the Seabrook Unit 1 reactor pressure vessel beltline) are well documented in the literature. Generally, low-alloy ferritic materials show an increase in hardness and tensile properties and a decrease in ductility and toughness during high-energy irradiation. A method for ensuring the integrity of reactor pressure vessels has been presented in Fracture Toughness Criteria for Protection Against Failure, Appendix G to Section XI of the ASME Boiler and Pressure Vessel Code [4]. The method uses fracture mechanics concepts and is based on the reference nil-ductility transition temperature (RTNDT). RTNDT is defined as the greater of either the drop-weight nil-ductility transition temperature (NDTT) per American Society of Testing and Materials (ASTM) E208 [5] or the temperature 60F less than the 50 ft-lb (and 35-mil lateral expansion) temperature as determined from Charpy specimens oriented perpendicular (transverse) to the major working direction of the plate. The RTNDT of a given material is used to index that material to a reference stress intensity factor curve (KIc curve) which appears in Appendix G to Section XI of the ASME Code [4]. The KIc curve is a lower bound of static fracture toughness results obtained from several heats of pressure vessel steel. When a given material is indexed to the KIc curve, allowable stress intensity factors can be obtained for this material as a function of temperature. Allowable operating limits can then be determined using these allowable stress intensity factors. RTNDT and, in turn, the operating limits of nuclear power plants, are adjusted to account for the effects of radiation on the reactor vessel material properties. The changes in mechanical properties of a given reactor pressure vessel steel, due to irradiation, are monitored by a reactor vessel surveillance program, such as the Seabrook Unit 1 reactor vessel radiation surveillance program, in which a surveillance capsule is periodically removed from the operating nuclear reactor and the encapsulated specimens are tested. The increase in the average Charpy V-notch 30 ft-lb temperature (RTNDT) due to irradiation is added to the initial RTNDT, along with a margin (M) to cover uncertainties, to adjust the RTNDT (ART) for radiation embrittlement. This ART (initial RTNDT + M + RTNDT) is used to index the material to the KIc curve and, in turn, to set operating limits for the nuclear power plant that take into account the effects of irradiation on the reactor vessel materials. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-1 4 DESCRIPTION OF PROGRAM Six surveillance capsules for monitoring the effects of neutron exposure on the Seabrook Unit 1 reactor pressure vessel core region (beltline) materials were inserted in the reactor vessel prior to initial plant startup. The six capsules were positioned in the reactor vessel, as shown in Figure 4-1, between the core barrel and the vessel wall. The vertical center of the capsules is opposite the vertical center of the core. The capsules contain specimens made from the following: Lower Shell Plate R1808-3 (longitudinal orientation) Lower Shell Plate R1808-3 (transverse orientation) Weld metal fabricated with weld wire Heat # 4P6052, Flux Type 0091, Flux Lot # 0145 Weld heat-affected zone (HAZ) material of Lower Shell Plate R1808-3 Test material obtained from the Lower Shell Plate R1808-3 (after thermal heat treatment and forming of the plate) was taken at least one plate thickness from the quenched edges of the plate. All test specimens were machined from the 1/4 thickness location of the plate after performing a simulated post-weld stress-relieving treatment on the test material. Test specimens were also removed from the weld and heat-affected zone metal of stress-relieved weldments joining Lower Shell Plate R1808-3 and the adjacent Lower Shell Plate R1808-1. All heat-affected zone specimens were obtained from the weld heat-affected zone of Lower Shell Plate R1808-3. Charpy V-notch impact specimens from Lower Shell Plate R1808-3 were machined in the longitudinal orientation (longitudinal axis of the specimen parallel to the major working direction) and also in the transverse orientation (longitudinal axis of the specimen perpendicular to the major working direction). The core-region weld Charpy impact specimens were machined from the weldment such that the long dimension of each Charpy specimen was perpendicular to the weld direction. The notch of the weld metal Charpy specimens was machined such that the direction of crack propagation in the specimen was in the welding direction. Tensile specimens from Lower Shell Plate R1808-3 were machined both in the longitudinal and transverse orientations. Tensile specimens from the weld metal were oriented with the long dimension of the specimen perpendicular to the welding direction. Compact tension test specimens from Lower Shell Plate R1808-3 were machined in both the longitudinal and transverse orientations to obtain fracture toughness data both normal and parallel to the rolling direction of the plate. Compact tension test specimens from the weld metal were machined normal to the weld direction with the notch oriented in the direction of the weld. All specimens were fatigue precracked according to ASTM E399 [6]. Capsule X contained dosimeter wires of pure iron, copper, nickel, and aluminum-0.15 weight percent cobalt (cadmium-shielded and unshielded). In addition, cadmium-shielded dosimeters of neptunium (237Np) and uranium (238U) were placed in the capsules to measure the integrated flux at specific neutron energy levels. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-2 The capsule contained thermal monitors made from two low-melting-point eutectic alloys, which were sealed in Pyrex tubes. These thermal monitors were used to define the maximum temperature attained by the test specimens during irradiation. The composition of the two eutectic alloys and their melting points are as follows: 2.5% Ag, 97.5% Pb Melting point: 579°F (304°C) 1.5% Ag, 1.0% Sn, 97.5% Pb Melting point: 590°F (310°C) The chemical composition and the heat treatment of the various mechanical specimens in Capsule X are presented in Table 4-1 and Table 4-2, respectively. The data in the tables were obtained from the original surveillance program report, WCAP-10110 [2], Appendix A. Capsule X was removed after 26.46 EFPY of plant operation. This capsule contained Charpy V-notch specimens, compact tension specimens, tensile specimens, dosimeters, and thermal monitors. The arrangement of the various mechanical specimens, dosimeters and thermal monitors contained in Capsule X is shown in Figure 4-2. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-3 Table 4-1 Chemical Composition (wt. %) of the Seabrook Unit 1 Reactor Vessel Surveillance Materials (Unirradiated) Lower Shell Plate Surveillance Weld Element R1808-3(1) Metal(2) C 0.20 0.15 Mn 1.45 1.28 P 0.007 0.009 S 0.010 0.007 Si 0.24 0.14 (4) Ni 0.59 0.049(3) Cr 0.06 0.03 Mo 0.55 0.52 (4) Cu 0.07 0.047(3) Al 0.028 0.003 V 0.003 0.003 Sn 0.011 0.004 Cb <0.01 <0.01 Zr <0.001 <0.001 Ti <0.01 <0.01 Notes:

1. The source of the plate data is the chemistry presented in WCAP-10110 [2],

unless otherwise noted.

2. Weld wire Heat Number 4P6052, Flux Type Linde 0091, and Flux Lot Number 0145. The weld material in the Seabrook Unit 1 surveillance program was made of the same wire and flux as all the reactor vessel beltline weld seams. The weld chemistry is the average of the CE (Combustion Engineering) and Westinghouse analyses from WCAP-10110 [2], unless otherwise noted.
3. Best Estimate Data from CE NPSD-1039,Best Estimate Copper and Nickel Values in CE Fabricated Reactor Vessel Welds, Revision 2 [7].
4. Average of original Surveillance test [2] and the Lukens Certified Material Test Report (CMTR) [8].

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*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-4 Table 4-2 Heat Treatment History of the Seabrook Unit 1 Reactor Vessel and Surveillance Materials(1) Material Temperature (F) Time (hrs.) Coolant Austenitizing: 1550 to 1650 4 Water quench Lower Shell Plates Tempered: 1225 4 Air cooled R1808-1, -2, -3 Stress relief: 1125 to 1175 16 Furnace cooled Austenitizing: 1550 to 1650 4 Water quench Intermediate Shell Plates Tempered: 1225 4 Air cooled R1806-1, -2, -3 Stress relief: 1125 to 1175 16.5 Furnace cooled Lower Shell Plate Stress relief: 1125 to 1175 16 Furnace cooled Longitudinal Seam Welds Intermediate Shell Stress relief: 1125 to 1175 16.5 Furnace cooled Longitudinal Seam Welds Intermediate to Lower Shell Stress relief: 1125 to 1175 12.5 Furnace cooled Girth Seam Weld Surveillance Program Test Material Surveillance Program Test Austenitizing: 1550 to 1650 4 Water quench Plate R1808-3 Tempered: 1225 4 Air cooled Stress relief: 1125 to 1175 16.5 Furnace cooled Weldment Stress relief: 1125 to 1175 12.5 Furnace cooled Note:

1. Data obtained from WCAP-10110 [2] and duplicated herein for completeness.

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*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-5 Figure 4-1 Arrangement of Surveillance Capsules in the Seabrook Unit 1 Reactor Vessel WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 4-6 LEGEND: KL - LOWER SHELL PLATE R1808-3 (LONGITUDINAL) KT - LOWER SHELL PLATE R1808-3 (TANGENTIAL) KW - WELD METAL (HEAT # 4P6052) KH - HEAT AFFECTED ZONE Tensile Compact Compact Charpy Charpy Charpy Compact Compact KW12 KW60 KH60 KW57 KH57 KW54 KH54 KW11 KW16 KW15 KW14 KW13 KW59 KH59 KW56 KH56 KW53 KH53 KL16 KL15 KL14 KL13 KW10 KW58 KH58 KW55 KH55 KW52 KH52 TOP OF VESSEL CENTER Dosimeter A Charpy Charpy Dosimeter Tensile Charpy Charpy Charpy Charpy KW51 KH51 KW48 KH48 KL12 KT60 KL60 KT57 KL57 KT54 KL54 KT51 KL51 KW50 KH50 KW47 KH47 474 KL11 KT59 KL59 KT56 KL56 KT53 KL53 KT50 KL50 KW49 KH49 KW46 KH46 KL10 KT58 KL58 KT55 KL55 KT52 KL52 KT49 KL49 CENTER Dosimeter B Dosimeters A and B Charpy Compact Compact Tensile Spacer KT48 KL48 KT12 Co Wire Co-Cd Wire KT47 KL47 KT16 KT15 KT14 KT13 KT11 KT46 KL46 KT10 Fe Wire Ni Wire BOTTOM OF VESSEL Cu Wire 579F (Dosimeter A) 590F (Dosimeter B) Dosimeter A Figure 4-2 Specimen Locations in the Seabrook Unit 1 Surveillance Capsule X per WCAP-10110 [2] WCAP-18607-NP March 2021 Revision 0 

                  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-1 5 TESTING OF SPECIMENS FROM CAPSULE X 5.1 OVERVIEW The post-irradiation mechanical testing of the Charpy V-notch impact specimens and tensile specimens was performed at the Westinghouse Churchill Hot Cell Facility. Testing was performed in accordance with 10 CFR 50, Appendix H [9] and ASTM Specification E185-82 [10]. Capsule X was opened upon receipt at the hot cell laboratory. The specimens and spacer blocks were carefully removed, inspected for identification number, and checked against the master list in WCAP-10110 [2]. All of the items were in their proper locations. Examination of the thermal monitors indicated that the three temperature monitors had not melted. Based on this examination, the maximum temperature to which the specimens were exposed was less than 579°F (304°C). The Charpy impact tests were performed per ASTM Specification E185-82 [10] and E23-18 [11] on a Tinius-Olsen Model 74, 358J machine. The Charpy machine striker was instrumented with an Instron1 Impulse system. Instrumented testing and calibration were performed to ASTM E2298-18 [12]. The instrumented striker load signal data acquisition rate was 819 kHz with data acquired for 10 ms. From the load-time curve, the load of general yielding (Fgy), the maximum load (Fm) and the time to maximum load were determined. Under some test conditions, a sharp drop in load indicative of fast fracture was observed. The load at which fast fracture was initiated is identified as the brittle fracture initiation/load at initiation of unstable crack propagation (Fbf). The termination load after the fast load drop is identified as the arrest load/load at end of unstable crack propagation (Fa). Fgy, Fm, Fbf, and Fa were determined per the guidance in ASTM Standard E2298-18 [12]. The maximum load energy (Wm) was determined by integrating the load-time record to the maximum load point via the instrumented Charpy software. The maximum load energy is approximately equivalent to the energy required to initiate a crack in the specimen. The integrated total impact energy (Wt) is compared to the absorbed energy measured from the dial energy (KV). Percent shear was determined from post-fracture photographs using the ratio-of-areas method in compliance with ASTM E23-18 [11] and A370-18 [13]. The lateral expansion was measured using a dial gage rig similar to that shown in the same ASTM Standards. Tensile tests were performed on a 250 kN capacity Instron screw driven tensile machine (Model 5985) per ASTM E185-82 [10]. Testing met ASTM Specifications E8/E8M-16a [14] for room temperature or E21-17 [15] for elevated temperatures. 1 Instron is a registered trademark of Illinois Tool Works Inc. (ITW). Other product and company names used herein are trademarks or trade names of their respective companies. WCAP-18607-NP March 2021 Revision 0 

 *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-2 The tensile specimens were, nominally, 4.23 inches long with a 1.00 inch gage length and 0.250 inch in diameter, per WCAP-10110 [2]. Strain measurements were made using an extensometer, which was attached to the 1.00-inch gage section of the tensile specimen. The strain rate obtained met the requirement of ASTM E8/E8M-16a [14] and ASTM E21-17 [15]. Elevated test temperatures were obtained with a three-zone electric resistance split-tube Instron SF-16 furnace with an 11-inch hot zone. For the elevated tests, temperature was measured by two Type N thermocouples in contact with the gage section of the specimen per ASTM E21-17 [15]. Tensile specimens were soaked at temperature (+/- 5ºF) for a minimum of 20 minutes before testing. All tests were conducted in air. The yield load, ultimate load, fracture load, uniform elongation, and elongation at fracture were determined directly from the load-extension curve. The yield strength (0.2% offset method), ultimate tensile strength, and fracture strength were calculated using the original cross-sectional area. Yield point elongation (YPE) was calculated as the difference in strain between the upper yield strength and the onset of uniform strain hardening using the methodology described in ASTM E8/E8M-16a [14]. The final diameter and final gage length were determined from post-fracture photographs. This final diameter measurement was used to calculate the fracture stress (fracture true stress) and the percent reduction in area. The reported total elongation is the elongation at fracture. All testing equipment was calibrated per Westinghouse procedures and in accordance with the ASTM standards cited herein. Records of calibration are available at Westinghouse. 5.2 CHARPY V-NOTCH IMPACT TEST RESULTS The results of the Charpy V-notch impact tests performed on the various materials contained in Capsule X, which received a fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) in 26.46 EFPY of operation, are presented in Tables 5-1 through 5-8 and are compared with the unirradiated and previously withdrawn capsule results as shown in Figures 5-1 through 5-12. The unirradiated capsule results were taken from WCAP-10110 [2]. The previous capsules results were taken from WCAP-16526-NP [16]. The previous capsules, along with the original program unirradiated material input data, were updated using CVGRAPH, Version 6.02. The transition temperature increases and decreases in upper-shelf energies for the Capsule X materials are summarized in Table 5-9 and led to the following results: Irradiation of the reactor vessel Lower Shell Plate R1808-3 Charpy specimens, oriented with the longitudinal axis of the specimen parallel to the major rolling direction (longitudinal orientation), resulted in an irradiated 30 ft-lb transition temperature of 44.4F and an irradiated 50 ft-lb transition temperature of 74.7°F. This results in a 30 ft-lb transition temperature increase of 72.5F and a 50 ft-lb transition temperature increase of 78.5F for the longitudinally oriented specimens. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-3 Irradiation of the reactor vessel Lower Shell Plate R1808-3 Charpy specimens, oriented with the longitudinal axis of the specimen perpendicular to the major rolling direction (transverse orientation), resulted in an irradiated 30 ft-lb transition temperature of 109.8F and an irradiated 50 ft-lb transition temperature of 148.4F. This results in a 30 ft-lb transition temperature increase of 100.8F and a 50 ft-lb transition temperature increase of 91.9F for the transversely oriented specimens. Irradiation of the surveillance program weld material (Heat # 4P6052) Charpy specimens resulted in an irradiated 30 ft-lb transition temperature of -40.8F and an irradiated 50 ft-lb transition temperature of 

     -15.3F. This results in a 30 ft-lb transition temperature increase of 33.8F and a 50 ft-lb transition temperature increase of 34.5F.

Irradiation of the HAZ material Charpy specimens resulted in an irradiated 30 ft-lb transition temperature of -21.9F and an irradiated 50 ft-lb transition temperature of 7.4F. This results in a 30 ft-lb transition temperature increase of 171.8F and a 50 ft-lb transition temperature increase of 147.6F. The average upper-shelf energy of Lower Shell Plate R1808-3 (longitudinal orientation) resulted in an average energy decrease of 10 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 115 ft-lb for the longitudinally oriented specimens. The average upper-shelf energy of Lower Shell Plate R1808-3 (transverse orientation) resulted in an average energy decrease of 9 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 70 ft-lb for the transverse oriented specimens. The average upper-shelf energy of the surveillance program weld material (Heat # 4P6052) Charpy specimens resulted in an average energy decrease of 36 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 124 ft-lb for the weld metal specimens. It is noted that none of the weld material Charpy specimens exhibited shear > 95%. Thus, this estimate of upper-shelf energy decrease is considered conservative. The average upper-shelf energy of the HAZ material Charpy specimens resulted in an average energy decrease of 12 ft-lb after irradiation. This decrease results in an irradiated average upper-shelf energy of 118 ft-lb for the HAZ material. Comparisons of the measured 30 ft-lb shift in transition temperature values and upper-shelf energy decreases to those predicted by Regulatory Guide 1.99, Rev. 2 [1] for the Seabrook Unit 1 reactor vessel surveillance materials are presented in Table 5-10. The fracture appearance of each irradiated Charpy specimen from the various materials is shown in Figures 5-13 through 5-16. The fractures show an increasingly ductile or tougher appearance with increasing test temperature. Load-time records for the individual instrumented Charpy specimens are contained in Appendix B. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-4 5.3 TENSILE TEST RESULTS The results of the tensile tests performed on the various materials contained in Capsule X irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV) are presented in Table 5-11 and are compared with unirradiated results as shown in Figure 5-17 through Figure 5-19. The results of the tensile tests performed on the Lower Shell Plate R1808-3 (longitudinal orientation) indicated that irradiation to 6.03 x 1019 n/cm2 (E > 1.0 MeV) caused increases in the 0.2 percent offset yield strength and the ultimate tensile strength when compared to unirradiated data in WCAP-10110 [2]. See Figure 5-17. The results of the tensile tests performed on the Lower Shell Plate R1808-3 (transverse orientation) indicated that irradiation to 6.03 x 1019 n/cm2 (E > 1.0 MeV) caused increases in the 0.2 percent offset yield strength and the ultimate tensile strength when compared to unirradiated data in WCAP-10110 [2]. See Figure 5-18. The results of the tensile tests performed on the surveillance program weld material (Heat # 4P6052) indicated that irradiation to 6.03 x 1019 n/cm2 (E > 1.0 MeV) caused increases in the 0.2 percent offset yield strength and the ultimate tensile strength when compared to unirradiated data in WCAP-10110 [2]. See Figure 5-19. The fractured tensile specimens for the Lower Shell Plate R1808-3 (longitudinal orientation) material are shown in Figure 5-20; the fractured tensile specimens for the Lower Shell Plate R1808-3 (transverse orientation) are shown in Figure 5-21; and the fracture tensile specimens for the surveillance program weld material (Heat # 4P6052) are shown in Figure 5-22. The engineering stress-strain curves for the tensile tests are shown in Figure 5-23 through Figure 5-31. 5.4 COMPACT TENSION SPECIMEN TEST RESULTS The 1/2T compact tension specimens were not tested and are being stored at the Westinghouse Churchill facility. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-5 Table 5-1 Charpy V-notch Data for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Longitudinal Orientation) Sample Temperature Impact Energy Lateral Expansion Shear Number °F °C ft-lbs Joules mils mm  % KL50 30 -1 12.75 17.29 13.0 0.3 25 KL51 40 4 27.5 37.28 22.0 0.6 25 KL60 50 10 32 43.39 24.0 0.6 35 KL53 60 16 69.5 94.23 49.0 1.2 45 KL56 60 16 19 25.76 17.0 0.4 25 KL57 78 26 61 82.70 42.0 1.1 45 KL49 90 32 78.5 106.43 53.0 1.3 60 KL58 100 38 41.75 56.60 31.0 0.8 40 KL52 110 43 71.5 96.94 55.0 1.4 60 KL59 130 54 106 143.71 76.0 1.9 85 KL47 140 60 69.5 94.23 52.0 1.3 65 KL55 160 71 107.5 145.75 73.5 1.9 80 KL54 180 82 109.5 148.46 69.5 1.8 100 KL46 200 93 121 164.05 75.0 1.9 100 KL48 220 104 114 154.56 73.0 1.9 100 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-6 Table 5-2 Charpy V-notch Data for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Transverse Orientation) Sample Temperature Impact Energy Lateral Expansion Shear Number °F °C ft-lbs Joules mils mm  % KT52 50 10.00 14.5 19.7 12.0 0.3 30 KT59 78 25.56 17.25 23.4 13.5 0.3 30 KT47 90 32.22 26.5 35.9 23.5 0.6 35 KT54 100 37.78 23.75 32.2 21.0 0.5 30 KT56 110 43.33 28 38.0 23.0 0.6 35 KT50 120 48.89 37.75 51.2 29.5 0.7 45 KT53 130 54.44 36 48.8 30.0 0.8 40 KT46 140 60.00 39.5 53.6 35.0 0.9 40 KT49 150 65.56 46.5 63.0 40.0 1.0 55 KT58 160 71.11 50.5 68.5 38.5 1.0 60 KT60 170 76.67 63 85.4 44.0 1.1 70 KT48 180 82.22 68.5 92.9 53.0 1.3 100 KT57 190 87.78 72.5 98.3 54.5 1.4 100 KT55 200 93.33 68 92.2 62.0 1.6 100 KT51 220 104.44 69.5 94.2 57.0 1.4 100 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-7 Table 5-3 Charpy V-notch Data for the Seabrook Unit 1 Surveillance Program Weld Material (Heat # 4P6052) Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) Sample Temperature Impact Energy Lateral Expansion Shear Number °F °C ft-lbs Joules mils mm  % KW56 -50 -46 4.75 6.44 3.5 0.1 5 KW46 -30 -34 18 24.40 14.5 0.4 30 KW60 -25 -32 62.5 84.74 42.0 1.1 40 KW55 -20 -29 11.5 15.59 8.0 0.2 15 KW50 -15 -26 73 98.97 50.0 1.3 45 KW48 -10 -23 70 94.91 49.5 1.3 45 KW52 -5 -21 120 162.70 80.0 2.0 70 KW54 0 -18 41.5 56.27 31.0 0.8 40 KW53 15 -9 50 67.79 35.0 0.9 40 KW47 25 -4 82 111.18 58.0 1.5 65 KW58 40 4 90.5 122.70 60.5 1.5 65 KW59 60 16 104.5 141.68 71.5 1.8 70 KW49 90 32 126.5 171.51 84.0 2.1 85 KW51 100 38 123 166.76 81.0 2.1 85 KW57 130 54 123.5 167.44 80.0 2.0 85 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-8 Table 5-4 Charpy V-notch Data for the Seabrook Unit 1 Heat-Affected Zone (HAZ) Material Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) Sample Temperature Impact Energy Lateral Expansion Shear Number °F °C ft-lbs Joules mils mm  % KH60 -50 -46 24.5 33.22 15.0 0.4 25 KH47 -30 -34 31.5 42.71 22.5 0.6 30 KH51 -25 -32 29 39.32 21.0 0.5 30 KH55 -20 -29 22.5 30.51 18.5 0.5 25 KH52 -15 -26 31 42.03 26.0 0.7 45 KH49 -10 -23 40.5 54.91 30.5 0.8 30 KH56 -5 -21 42.5 57.62 27.5 0.7 50 KH50 0 -18 49 66.43 33.0 0.8 50 KH54 15 -9 66.75 90.50 44.0 1.1 50 KH53 25 -4 50.5 68.47 38.0 1.0 60 KH57 40 4 62.5 84.74 43.5 1.1 60 KH48 60 16 88 119.31 57.0 1.4 70 KH59 90 32 107 145.07 76.0 1.9 80 KH58 100 38 121 164.05 75.0 1.9 85 KH46 130 54 118 159.98 74.0 1.9 100 WCAP-18607-NP March 2021 Revision 0 

 *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-9 Table 5-5 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Longitudinal Orientation) Total Total Dial Energy to General Brittle Test Instrumented Difference, Maximum Time to Arrest Sample Energy, Max Load, Yield Fracture Temp Energy, (KV-Wt)/KV Load, Fm Fm Load, Fa Number KV Wm Load, Fgy Load, Fbf (°F) Wt (%) (lb) (msec) (lb) (ft-lb) (ft-lb) (lb) (lb) (ft-lb) KL50(1) 30 13 7 48% 3 3888 0.09 3384 3504 0 KL51(1) 40 28 21 22% 20 4232 0.38 3283 4218 0 KL60(1) 50 32 26 18% 19 4155 0.36 3175 4148 410 KL53 60 70 61 12% 35 4334 0.61 3138 4098 753 KL56(1) 60 19 11 42% 3 3858 0.09 3196 3552 575 KL57 78 61 52 15% 35 4363 0.61 3200 4195 1566 KL49 90 79 70 11% 35 4362 0.60 3106 3982 1624 KL58(1) 100 42 35 16% 19 4012 0.36 3069 4012 1578 KL52 110 72 65 9% 34 4195 0.61 2950 3297 1635 KL59 130 106 100 6% 34 4226 0.60 2938 3388 2325 KL47 140 70 67 4% 32 4275 0.60 2941 4059 2039 KL55 160 108 103 4% 34 4202 0.62 3011 1516 1008 KL54 180 110 102 7% 34 4122 0.61 2929 0 0 KL46 200 121 113 6% 33 4140 0.62 2877 0 0 KL48 220 114 107 6% 33 4118 0.60 2742 0 0 Note:

1. The difference between instrumented Charpy and dial values was greater than 15% for specimens KL51, KL60, and KL58 and greater than 25% for specimens KL50 and KL56.

The values were neither adjusted (>15%) nor discarded (>25%) as required by [12] since this data is not required but is presented for informational purposes only. WCAP-18607-NP March 2021 Revision 0 

                        *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-10 Table 5-6 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Lower Shell Plate R1808-3 Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) (Transverse Orientation) Total Total Dial Energy to General Brittle Test Instrumented Difference, Maximum Time to Arrest Sample Energy, Max Load, Yield Fracture Temp Energy, (KV-Wt)/KV Load, Fm Fm Load, Fa Number KV Wm Load, Fgy Load, Fbf (°F) Wt (%) (lb) (msec) (lb) (ft-lb) (ft-lb) (lb) (lb) (ft-lb) KT52(1) 50 15 11 22% 3 4019 0.09 3308 3312 791 KT59(1) 78 17 10 43% 4 3974 0.09 3360 3756 1068 KT47(1) 90 27 22 17% 19 4083 0.36 3119 4083 748 KT54(1) 100 24 17 29% 15 4008 0.29 3192 3972 696 KT56 110 28 24 14% 15 3914 0.29 3111 3838 1083 KT50 120 38 33 12% 19 3958 0.36 3073 3798 1607 KT53 130 36 31 15% 19 4110 0.36 3205 3661 1544 KT46 140 40 36 10% 22 3894 0.41 3043 3829 1647 KT49 150 47 42 10% 19 4004 0.36 3042 3851 2594 KT58 160 51 45 10% 18 3981 0.36 3036 3623 2153 KT60 170 63 58 9% 27 4099 0.48 3078 3898 3038 KT48 180 69 63 8% 23 3963 0.43 2921 0 0 KT57 190 73 67 8% 28 4019 0.51 2975 0 0 KT55 200 68 64 6% 18 3778 0.36 2799 0 0 KT51 220 70 65 7% 25 3829 0.48 2814 0 0 Note:

1. The difference between instrumented Charpy and dial values was greater than 15% for specimens KT52 and KT47 and greater than 25% for specimens KT59 and KT54. The values were neither adjusted (>15%) nor discarded (>25%) as required by [12] since this data is not required but is presented for informational purposes only.

WCAP-18607-NP March 2021 Revision 0 

                         *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-11 Table 5-7 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Surveillance Program Weld Material (Heat # 4P6052) Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) Total Energy to Total Dial General Brittle Arrest Test Instrumented Difference, Max Maximum Time to Sample Energy, Yield Fracture Load, Temp Energy, (KV-Wt)/KV Load, Load, Fm Fm Number KV Load, Fgy Load, Fbf Fa (°F) Wt (%) Wm (lb) (msec) (ft-lb) (lb) (lb) (lb) (ft-lb) (ft-lb) KW56 -50 5 5 -5% 3 4206 0.09 3390 3940 0 KW46(1) -30 18 14 24% 4 4247 0.09 3578 4003 614 KW60 -25 63 58 8% 38 4421 0.61 3592 4254 1614 KW55(1) -20 12 9 20% 4 4328 0.12 3603 3519 0 KW50 -15 73 67 8% 37 4433 0.61 3428 4076 1550 KW48 -10 70 62 11% 37 4387 0.6 3376 4078 1743 KW52 -5 120 115 4% 37 4440 0.6 3412 2843 1166 KW54 0 42 36 14% 19 4611 0.39 3399 4215 1288 KW53 15 50 44 12% 31 4365 0.51 3494 4186 1761 KW47 25 82 76 8% 36 4325 0.6 3340 4143 2163 KW58 40 91 86 5% 36 4292 0.61 3345 3989 2185 KW59 60 105 100 5% 35 4287 0.61 3236 3483 2307 KW49 90 127 120 5% 46 4271 0.8 3154 2565 1713 KW51 100 123 116 6% 35 4226 0.6 3100 2893 1938 KW57 130 124 116 6% 33 4022 0.61 3025 3239 2608 Note:

1. The difference between instrumented Charpy and dial values was greater than 15% for specimens KW46 and KW55. The values were not adjusted (>15%) as required by [12]

since this data is not required but is presented for informational purposes only. WCAP-18607-NP March 2021 Revision 0 

                           *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-12 Table 5-8 Instrumented Charpy Impact Test Results for the Seabrook Unit 1 Heat-Affected Zone (HAZ) Material Irradiated to a Fluence of 6.03 x 1019 n/cm2 (E > 1.0 MeV) Total Energy to Total Dial General Brittle Arrest Test Instrumented Difference, Max Maximum Time to Sample Energy, Yield Fracture Load, Temp Energy, (KV-Wt)/KV Load, Load, Fm Fm Number KV Load, Fgy Load, Fbf Fa (°F) Wt (%) Wm (lb) (msec) (ft-lb) (lb) (lb) (lb) (ft-lb) (ft-lb) KH60 -50 25 23 8% 21 4455 0.36 3596 4455 0 KH47 -30 32 28 11% 4 4270 0.09 3525 4161 258 KH51(1) -25 29 24 17% 21 4407 0.36 3451 4247 440 KH55(1) -20 23 15 35% 4 4316 0.09 3579 4071 652 KH52(1) -15 31 25 20% 3 4301 0.09 3510 4257 1046 KH49(1) -10 41 34 16% 30 4294 0.51 3494 4036 625 KH56 -5 43 36 15% 24 4251 0.41 3557 4170 1638 KH50 0 49 41 15% 37 4442 0.62 3481 4442 1055 KH54 15 67 60 11% 38 4501 0.6 3515 4139 1683 KH53 25 51 46 8% 30 4325 0.51 3501 4310 1750 KH57 40 63 58 8% 37 4451 0.6 3511 4199 1832 KH48 60 88 80 9% 36 4338 0.6 3222 3203 1516 KH59 90 107 101 6% 35 4351 0.61 3169 3274 749 KH58 100 121 114 6% 35 4310 0.6 3213 2408 1858 KH46 130 118 112 5% 34 4207 0.61 3127 0 0 Note:

1. The difference between instrumented Charpy and dial values was greater than 15% for specimens KH51, KH52, and KH49 and greater than 25% for specimen KH55. The values were neither adjusted (>15%) nor discarded (>25%) as required by [12] since this data is not required but is presented for informational purposes only.

WCAP-18607-NP March 2021 Revision 0 

                         *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-13 Table 5-9 Effect of Irradiation to 6.03 x 1019 n/cm2 (E > 1.0 MeV) on the Charpy V-Notch Toughness Properties of the Seabrook Unit 1 Reactor Vessel Surveillance Capsule X Materials Average 30 ft-lb Transition Average 35 mil Lateral Expansion Average 50 ft-lb Transition Average Energy Absorption Temperature(1) Temperature(1) Temperature(1) > 95% Shear(2) Material (°F) (°F) (°F) (ft-lb) Unirradiated Irradiated T Unirradiated Irradiated T Unirradiated Irradiated T Unirradiated Irradiated E Lower Shell Plate R1808-3 -28.1 44.4 72.5 -6.3 70.0 76.3 -3.8 74.7 78.5 125 115 -10 (Longitudinal) Lower Shell Plate 9.0 109.8 100.8 46.4 134.3 87.9 56.5 148.4 91.9 79 70 -9 R1808-3 (Transverse) Surveillance Weld Material -74.6 -40.8 33.8 -47.1 -15.2 31.9 -49.8 -15.3 34.5 160 124(3) -36 (Heat # 4P6052) Heat-Affected Zone 

                              -193.7            -21.9         171.8          -120.2            6.1       126.3       -140.2              7.4       147.6           130               118       -12 (HAZ) Material Notes:
1. Average value is determined by CVGRAPH, Version 6.02 (see Appendix C).
2. Upper-shelf energy (USE) values are a calculated average from unirradiated and Capsule X Charpy test results for in-family specimens that achieved greater than or equal to 95% shear.
3. No specimens exhibited 95% or greater shear. Thus, this value is based upon the average of three specimens at 85% shear (i.e., the maximun recorded shear). This approach is conservative, as the actual USE is expected to be greater than 124 ft-lb if greater than 95% shear was obtained.

WCAP-18607-NP March 2021 Revision 0 

                                   *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-14 Table 5-10 Comparison of the Seabrook Unit 1 Surveillance Material 30 ft-lb Transition Temperature Shifts and Upper-Shelf Energy Decreases with Regulatory Guide 1.99, Revision 2, Predictions Capsule 30 ft-lb Transition Upper-Shelf Energy Irradiation Fluence Temperature Shift Decrease Temperature(5) Material Capsule (°F) (x 1019 n/cm2, Predicted(1) Measured(2) Predicted(1) Measured(2) E > 1.0 MeV) (°F) (°F) (%) (%) U 0.311 29.9 39.7 15 6 559 Lower Shell Y 1.30 47.2 47.2 20 14 559 Plate R1808-3 V 2.66 55.5 60.4 24 10 559 (Longitudinal) X 6.03 63.2 72.5 30 8 559 U 0.311 29.9 28.8 15 8 559 Lower Shell 20 Y 1.30 47.2 34.9 16 559 Plate R1808-3 V 2.66 55.5 61.3 24 13 559 (Transverse) X 6.03 63.2 100.8 30 11 559 Surveillance U 0.311 20.9 25.4 15 10 559 Weld Material Y 1.30 32.9 24.3 20 10 559 (Heat # V 2.66 38.7 41.7 24 3 559 4P6052) X 6.03 44.1 33.8 30 23 (3) 559 (4) U 0.311 94.4 0 559 Heat-Affected Y 1.30 147.7 12 559 Zone Material V 2.66 139.2 0 559 X 6.03 171.8 9 559 Notes:

1. Based on Regulatory Guide 1.99, Revision 2 [1], methodology using the capsule fluence and best-estimate weight percent values of copper and nickel of the surveillance material. For the predicted USE decrease determinations, the Cu weight percentages were conservatively rounded up to the lowest line (Cu weight % of 0.10 for base metal and 0.05 for weld metal) in Regulatory Guide 1.99, Revision 2, Figure 2. Also note that for Capsule X, the fluence value is slightly beyond the scale in Figure 2; therefore, the predicted USE was extrapolated from the available data in the figure.
2. Calculated using measured Charpy data (See Appendix C).
3. No specimens exhibited 95% or greater shear. Thus, this value is based upon the average of three specimens at 85% shear. This approach is conservative, as the actual USE decrease is expected to be smaller if greater than 95% shear was obtained.
4. Physically, an increase in USE should not occur after irradiation. Therefore, a conservative 0% decrease value is shown here instead of the measured increase.
5. The irradiation temperature is the time-weighted average reactor vessel inlet temperature during the period of irradiation.

WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-15 Table 5-11 Tensile Properties of the Seabrook Unit 1 Capsule X Reactor Vessel Surveillance Materials Irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV) 0.2% Fracture Test Ultimate Fracture Fracture Uniform Total Reduction Sample Yield True Material Temp. Strength Load Strength Elongation Elongation in Area Number Strength Stress (°F) (ksi) (kip) (ksi) (%) (%) (%) (ksi) (ksi) KL10 76 82.1 101.2 3.43 69.4 202 10.1 24.2 66 Lower Shell Plate R1808-3 KL11 200 79.3 97.3 3.27 66.7 204 10.3 25.3 67 (Longitudinal) KL12 560 73.5 96.7 3.70 75.3 147 9.2 19.0 49 KT10 76 82.8 101.2 3.86 79.3 174 9.7 20.0 54 Lower Shell Plate R1808-3 KT11 150 81.8 99.8 3.69 76.5 161 10.6 21.2 52 (Transverse) KT12 560 74.6 97.5 4.05 83.8 151 10.3 16.7 44 KW10 76 79.6 93.4 2.73 55.6 183 10.3 28.7 70 Surveillance Weld Material KW11 200 76.9 89.3 2.63 53.7 208 8.1 22.0 74 (Heat # 4P6052) KW12 560 72.6 90.9 2.64 54.7 193 10.5 25.7 72 WCAP-18607-NP March 2021 Revision 0 

                     *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-16 Figure 5-1 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-17 Figure 5-1 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-18 Figure 5-2 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-19 Figure 5-2 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-20 Figure 5-3 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-21 Figure 5-3 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-22 Figure 5-4 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-23 Figure 5-4 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-24 Figure 5-5 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-25 Figure 5-5 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-26 Figure 5-6 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-27 Figure 5-6 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-28 Figure 5-7 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-29 Figure 5-7 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-30 Figure 5-8 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-31 Figure 5-8 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-32 Figure 5-9 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-33 Figure 5-9 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-34 Figure 5-10 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-35 Figure 5-10 Charpy V-Notch Impact Energy vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-36 Figure 5-11 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-37 Figure 5-11 Charpy V-Notch Lateral Expansion vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-38 Figure 5-12 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-39 Figure 5-12 Charpy V-Notch Percent Shear vs. Temperature for Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material (cont.) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-40 KL50, 30°F KL51, 40°F KL60, 50°F KL53, 60°F KL56, 60°F KL57, 78°F KL49, 90°F KL58, 100°F KL52, 110°F KL59, 130°F KL47, 140°F KL55, 160°F KL54, 180°F KL46, 200°F KL48, 220°F Figure 5-13 Charpy Impact Specimen Fracture Surfaces for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-41 KT52, 50°F KT59, 78°F KT47, 90°F KT54 100°F KT56, 110°F KT50, 120°F KT53, 130°F KT46, 140°F KT49, 150°F KT58, 160°F KT60, 170°F KT48, 180°F KT57, 190°F KT55, 200°F KT51, 220°F Figure 5-14 Charpy Impact Specimen Fracture Surfaces for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-42 KW56, -50°F KW46, -30°F KW60, -25°F KW55, -20°F KW50, -15°F KW48, -10°F KW52, -5°F KW54, 0°F KW53, 15°F KW47, 25°F KW58, 40°F KW59, 60°F KW49, 90°F KW51, 100°F KW57, 130°F Figure 5-15 Charpy Impact Specimen Fracture Surfaces for the Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-43 KH60, -50°F KH47, -30°F KH51, -25°F KH55, -20°F KH52, -15°F KH49, -10°F KH56, -5°F KH50, 0°F KH54 15°F KH53, 25°F KH57, 40°F KH48, 60°F KH59, 90°F KH58, 100°F KH46, 130°F Figure 5-16 Charpy Impact Specimen Fracture Surfaces for the Seabrook Unit 1 Reactor Vessel Heat-Affected Zone Material WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-44 Legend:, , and are unirradiated 

                            , , and  are irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV)

Figure 5-17 Tensile Properties for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-45 Legend:, , and are unirradiated 

                            , , and  are irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV)

Figure 5-18 Tensile Properties for Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 5-46 Legend:, , and are unirradiated 

                            , , and  are irradiated to 6.03 x 1019 n/cm2 (E > 1.0 MeV)

Figure 5-19 Tensile Properties for Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-47 KL10 tested at 76°F KL11 tested at 200°F KL12 tested at 560°F Figure 5-20 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Longitudinal Orientation) WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-48 KT10 tested at 76°F KT11 tested at 150°F KT12 tested at 560°F Figure 5-21 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Lower Shell Plate R1808-3 (Transverse Orientation) WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-49 KW10 tested at 76°F KW11 tested at 200°F KW12 tested at 560°F Figure 5-22 Fractured Tensile Specimens from Seabrook Unit 1 Reactor Vessel Surveillance Program Weld Material (Heat # 4P6052) WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-50 Figure 5-23 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL10, Tested at 76°F Figure 5-24 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL11, Tested at 200°F Figure 5-25 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KL12, Tested at 560°F WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-51 Figure 5-26 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT10, Tested at 76°F Figure 5-27 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT11, Tested at 150°F Figure 5-28 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KT12, Tested at 560°F WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 5-52 Figure 5-29 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW10, Tested at 76°F Figure 5-30 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW11, Tested at 200°F Figure 5-31 Engineering Stress-Strain Curve for Seabrook Unit 1, Capsule X, Tensile Specimen KW12, Tested at 560°F WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-1 6 RADIATION ANALYSIS AND NEUTRON DOSIMETRY

6.1 INTRODUCTION

This section describes a discrete ordinates (Sn) transport analysis performed for the Seabrook Unit 1 reactor to determine the neutron radiation environment within the reactor pressure vessel and surveillance capsules. In this analysis, fast neutron exposure parameters in terms of fast neutron (E > 1.0 MeV) fluence and iron atom displacements (dpa) were established on a plant- and fuel-cycle-specific basis. An evaluation of the most recent dosimetry sensor set from Capsule X, withdrawn at the end of the 20th plant operating cycle, is provided. Comparisons of the results from the dosimetry evaluations with the analytical predictions served to validate the plant-specific neutron transport calculations. These validated calculations subsequently form the basis for projections of the neutron exposure of the reactor pressure vessel for operating periods extending to 60 effective full-power years (EFPY). The use of fast neutron (E > 1.0 MeV) fluence to correlate measured material property changes to the neutron exposure of the material has traditionally been accepted for the development of damage trend curves as well as for the implementation of trend curve data to assess the condition of the vessel. However, it has been suggested that an exposure model that accounts for differences in neutron energy spectra between surveillance capsule locations and positions within the vessel wall could lead to an improvement in the uncertainties associated with damage trend curves and improved accuracy in the evaluation of damage gradients through the reactor vessel wall. Because of this potential shift away from a threshold fluence toward an energy-dependent damage function for data correlation, ASTM E853-18, Standard Practice for Analysis and Interpretation of Light-Water Reactor Surveillance Results [17], recommends reporting displacements per iron atom along with fluence (E > 1.0 MeV) to provide a database for future reference. The energy-dependent dpa function to be used for this evaluation is specified in ASTM E693-94, Standard Practice for Characterizing Neutron Exposures in Iron and Low Alloy Steels in Terms of Displacements per Atom [18]. The application of the dpa parameter to the assessment of embrittlement gradients through the thickness of the reactor vessel wall has been promulgated in Revision 2 to Regulatory Guide 1.99, Radiation Embrittlement of Reactor Vessel Materials [1]. All of the calculations and dosimetry evaluations described in this section and in Appendix A were based on nuclear cross-section data derived from ENDF/B-VI. Furthermore, the neutron transport and dosimetry evaluation methodologies follow the guidance of Regulatory Guide 1.190, Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence [19]. Additionally, the methods used to develop the calculated pressure vessel fluence are consistent with the NRC-approved methodology described in WCAP-18124-NP-A, Fluence Determination with RAPTOR-M3G and FERRET [20]. 6.2 DISCRETE ORDINATES ANALYSIS The arrangement of the surveillance capsules in the Seabrook Unit 1 reactor vessel is shown in Figure 4-1. Six irradiation capsules attached to the neutron pads are included in the reactor design that constitutes the reactor vessel surveillance program. Capsules U, V, W, X, Y, and Z are located at azimuthal angles of 58.5°, 61°, 121.5°, 238.5°, 241°, and 301.5°, respectively. These full-core positions correspond to the following octant symmetric locations represented in Figure 6-1and Figure 6-2: 29° from the core cardinal axes (for WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-2 the 61° and 241° dual surveillance capsule holder locations) and 31.5° from the core cardinal axes (for the 121.5 and 301.5° single surveillance capsule holder locations, and for the 58.5° and 238.5° dual surveillance capsule holder locations). The stainless steel specimen containers are 1.25 inch by 1.01 inch and are approximately 56 inches in height. The containers are positioned axially such that the test specimens are centered on the core midplane, thus spanning the central five feet of the 12-foot high reactor core. From a neutronic standpoint, the surveillance capsules and associated support structures are significant. The presence of these materials has a significant effect on both the spatial distribution of neutron exposure rate and the neutron spectrum in the vicinity of the capsules. However, the capsules are far enough apart that they do not interfere with one another. In order to determine the neutron environment at the test specimen location, the capsules themselves must be included in the analytical model. In performing the fast neutron exposure evaluations for the Seabrook Unit 1 reactor vessel and surveillance capsules, plant-specific 3D forward transport calculations were carried out to directly solve for the space-and energy-dependent neutron exposure rate, (r,,z,E). For the Seabrook Unit 1 transport calculations, the models depicted in Figure 6-1 and Figure 6-2 were utilized. The reactor is quadrant symmetric with two different neutron pad and surveillance capsule configurations: quadrants with a 32.5-degree neutron pad segment and a surveillance capule located at 31.5°, and quadrants with a 35-degree neutorn pad segment and surveillance capsules located at 29.5° and 31.5°. Each quadrant model contained a representation of the reactor core, the reactor internals, the pressure vessel cladding and vessel wall, the insulation external to the pressure vessel, and the primary biological shield wall. These models formed the basis for the calculated results and enabled making comparisons to the surveillance capsule dosimetry evaluations. In developing these analytical models, nominal design dimensions were generally employed for the various structural components. In addition, water temperatures, and hence, coolant densities in the reactor core and downcomer regions of the reactor were taken to be representative of full-power operating conditions. The coolant densities were treated on a fuel-cycle-specific basis. The reactor core itself was treated as a homogeneous mixture of fuel, cladding, water, and miscellaneous core structures, such as fuel assembly grids, guide tubes, etc. Section views of the models are shown in Figure 6-3 through Figure 6-5. Both models extended radially from the centerline of the reactor core out to a location interior to the primary biological shield and over an axial span from an elevation more than five feet below the active fuel to more than five feet above the active fuel. Each of the two RAPTOR-M3G models consisted of 282 radial mesh, 182 azimuthal mesh, and 471 axial mesh. Mesh sizes were chosen to assure that proper convergence of the inner iterations was achieved on a pointwise basis. The pointwise inner iteration flux convergence criterion utilized in the calculations was set at a value of 0.001. The core power distributions used in the plant-specific transport analysis for the first 20 fuel cycles at Seabrook Unit 1 included cycle-dependent fuel assembly initial enrichments, burnups, radial and axial power distributions. Actual operating characteristics through Cycle 20 have been evaluated; projections WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-3 beyond Cycle 20 were based on the linear average of Cycles 17, 19, and 20 spatial power distributions, water temperatures, and reactor power level. The cycle-dependent fuel assembly initial enrichments, burnups, radial and axial power distributions were used to develop spatial- and energy-dependent core source distributions averaged over each individual fuel cycle. Therefore, the results from the neutron transport calculations provided data in terms of fuel-cycle-averaged neutron exposure rate, which when multiplied by the appropriate fuel cycle length, generated the incremental fast neutron exposure for each fuel cycle. In constructing these core source distributions, the energy distribution of the source was based on an appropriate fission split for uranium and plutonium isotopes based on the initial enrichment and burnup history of individual fuel assemblies. From these assembly-dependent fission splits, composite values of energy release per fission, neutron yield per fission, and fission spectrum were determined. All of the transport calculations supporting this analysis were carried out using the RAPTOR-M3G discrete ordinates code and the BUGLE-96 cross-section library, as described in [20]. The BUGLE-96 library provides a coupled 47-neutron, 20-gamma-group cross-section data set produced specifically for light-water reactor (LWR) applications. In these analyses, anisotropic scattering was treated with a P3 Legendre expansion, and angular discretization was modeled with an S16 order of angular quadrature. Energy- and space-dependent core power distributions, as well as system operating temperatures, were treated on a fuel-cycle-specific basis. Results of the discrete ordinates transport analyses pertinent to the surveillance capsule evaluations are provided in Table 6-1 through Table 6-3. In Table 6-1, the calculated fast neutron fluence rate and fluence (E > 1.0 MeV) are provided at the geometric center of the capsules, as a function of irradiation time for the Seabrook Unit 1 reactor. Similar data presented in terms of iron atom displacement rate and integrated iron atom displacements are given in Table 6-2. In Table 6-3, lead factors associated with surveillance capsules are provided as a function of operating time for the Seabrook Unit 1 reactor. The lead factor is defined as the ratio of the neutron fluence (E > 1.0 MeV) at the geometric center of the surveillance capsule to the maximum neutron fluence (E > 1.0 MeV) at the pressure vessel clad/base metal interface. Neutron exposure data pertinent to the pressure vessel clad/base metal interface are given in Table 6-4 and Table 6-5 for neutron fluence (E > 1.0 MeV) rate and fluence (E > 1.0 MeV), respectively, and in Table 6-6 and Table 6-7 for dpa/s and dpa, respectively. In each case, the data are provided for each operating cycle of the Seabrook Unit 1 reactor. Neutron fluence (E > 1.0 MeV) and dpa are also projected to future operating times extending to 60 EFPY. The vessel exposure data are presented in terms of the maximum exposure experienced by the pressure vessel at azimuthal angles of 0°, 15°, 30°, and 45°, and at the azimuthal location providing the maximum exposure relative to the core cardinal axes. In Table 6-8 and Table 6-9, maximum projected fluences and dpa, respectively, of the various pressure vessel materials are given. These data tabulations include both plant- and fuel-cycle-specific calculated neutron exposures at the end of Cycle 20 and projections to 60 EFPY. The projections beyond Cycle 20 were based on the linear average of Cycles 17, 19, and 20 spatial power distributions, water temperatures, and reactor power level. WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-4 6.3 NEUTRON DOSIMETRY The validity of the calculated neutron exposures reported in Section 6.2 is demonstrated by a direct comparison against the measured sensor reaction rates and a least-squares evaluation performed for each of the capsule dosimetry sets. However, since the neutron dosimetry measurement data merely serve to validate the calculated results, only the direct comparison of measured-to-calculated results for the most recent surveillance capsule removed from Seabrook Unit 1, Capusle X, is provided in this section of the report. For completeness, the assessment of all measured dosimetry removed from Seabrook Unit 1 up to date based on both direct and least-squares evaluation comparisons is documented in Appendix A. The direct comparison of measured versus calculated fast neutron threshold reaction rates for the sensors from Capsule X, that was withdrawn from the reactor at the conclusion of Cycle 20, is summarized below. Reaction Rate (rps/atom) Reaction M/C Measured Calculated 63 Cu (n,) 60Co 3.60E-17 4.03E-17 0.89 54 Fe (n,p) 54Mn 4.55E-15 4.37E-15 1.04 58 Ni (n,p) 58Co 6.17E-15 6.11E-15 1.01 238 U(Cd) (n,f) 137Cs 2.77E-14 2.31E-14 1.20 237 Np(Cd) (n,f) 137Cs 2.33E-13 2.22E-13 1.05 Average of M/C Results 1.04 Standard Deviation (%) 11 The measured-to-calculated (M/C) reaction rate ratios for the Capsule X threshold reactions range from 0.89 to 1.20, and the average M/C ratio is 1.04 11% (1). This direct comparison falls within the 20% criterion specified in Regulatory Guide 1.190. This comparison validates the current analytical results described in Section 6.2; therefore, the calculations are deemed applicable for Seabrook Unit 1. 6.4 CALCULATIONAL UNCERTAINTIES The uncertainty associated with the calculated neutron exposure of the Seabrook Unit 1 surveillance capsule and reactor pressure vessel is based on the recommended approach provided in Regulatory Guide 1.190. In particular, the qualification of the methodology was carried out in the following four stages:

1. Simulator Benchmark Comparisons: Comparisons of calculations with measurements from simulator benchmarks, including the Pool Critical Assembly (PCA) simulator at the Oak Ridge National Laboratory (ORNL) and the VENUS-1 Experiment.
2. Operating Reactor and Calculational Benchmarks: Comparisons of calculations with surveillance capsule and reactor cavity measurements from the H.B. Robinson power reactor benchmark experiment. Also considered are comparisons of calculations to results published in the NRC fluence calculation benchmark.

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Westinghouse Non-Proprietary Class 3 6-5

3. Analytic Uncertainty Analysis: An analytical sensitivity study addressing the uncertainty components resulting from important input parameters applicable to the plant-specific transport calculations used in the neutron exposure assessments.
4. Plant-Specific Benchmarking: Comparisons of the plant-specific calculations with all available dosimetry results from the Seabrook Unit 1 surveillance program.

The first phase of the methods qualification (simulator benchmark comparisons) addressed the adequacy of basic transport calculation and dosimetry evaluation techniques and associated cross-sections. This phase, however, did not test the accuracy of commercial core neutron source calculations nor did it address uncertainties in operational or geometric variables that impact power reactor calculations. The second phase of the qualification (operating reactor and calculational benchmark comparisons) addressed uncertainties in these additional areas that are primarily methods-related and would tend to apply generically to all fast neutron exposure evaluations. The third phase of the qualification (analytical sensitivity study) identified the potential uncertainties introduced into the overall evaluation due to calculational methods approximations, as well as to a lack of knowledge relative to various plant-specific input parameters. The overall calculational uncertainty applicable to the Seabrook Unit 1 analysis was established from results of these three phases of the methods qualification. The fourth phase of the uncertainty assessment (comparisons with Seabrook Unit 1 measurements) was used solely to demonstrate the validity of the transport calculations and to confirm the uncertainty estimates associated with the analytical results. The comparison was used only as a check and was not used in any way to modify the calculated surveillance capsule and pressure vessel neutron exposures described in Section 6.2. As such, the validation of the Seabrook Unit 1 analytical model based on the measured plant dosimetry is completely described in Appendix A. The following summarizes the uncertainties developed from the first three phases of the methodology qualification. Additional information pertinent to these evaluations is provided in Westinghouse Report WCAP-18124-NP-A, Fluence Determination with RAPTOR-M3G and FERRET [20]. Description Capsule and Vessel IR Simulator Benchmark Comparisons 3% Operating Reactor and Calculational Benchmarks 5% Analytic Uncertainty Analysis 11% Additional Uncertainty for Factors not Explicitly Evaluated 5% Net Calculational Uncertainty 13% The net calculational uncertainty was determined by combining the individual components in quadrature. Therefore, the resultant uncertainty was treated as random, and no systematic bias was applied to the analytical results. The plant-specific measurement comparisons described in Appendix A support these uncertainty assessments for Seabrook Unit 1. WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-6 The NRC-issued Safety Evaluation for WCAP-18124-NP-A appears in Section A of [20]. The NRC identified two Limitations and Conditions associated with the application of RAPTOR-M3G and FERRET, which are reproduced here for convenience:

1. Applicability of WCAP-18124-NP, Revision 0 is limited to the RPV region near the active height of the core based on the uncertainty analysis performed and the measurement data provided.

Additional justification should be provided via additional benchmarking, fluence sensitivity analysis to the response parameters of interest (e.g. pressure-temperature limits, material stress/strain), margin assessment, or a combination thereof, for applications of the method to components including, but not limited to, the RPV upper circumferential weld and the reactor coolant system inlet and outlet nozzles and reactor vessel internal components.

2. Least squares adjustment is acceptable if the adjustments to the M/C radios and to the calculated spectra values are within the assigned uncertainties of the calculated spectra, the dosimetry measured reaction rates, and the dosimetry reaction cross sections. Should this not be the case, the user should re-examine both measured and calculated values for possible errors. If errors cannot be found, the particular values causing the discrepancy should be disqualified.

The primary purpose of this report is to describe the evaluation of a surveillance capsule. The neutron exposure values applicable to the surveillance capsules and the maximum reactor pressure vessel neutron exposure values used to derive the surveillance capsule lead factors are completely covered by the benchmarking and uncertainty analyses in WCAP-18124-NP-A. Therefore, Limitation # 1 does not strictly apply. Note, however, that this report does contain neutron exposure values for materials that are outside the qualification basis of WCAP-18124-NP-A (i.e., extended beltline materials). Should values outside the qualification basis of WCAP-18124-NP-A be cited in future evaluations of reactor vessel integrity, additional justification should be supplied, as stated in Limitation # 1. Limitation # 2 applies in situations where the least squares analysis is used to adjust the calculated values of neutron exposure. In this report, the least-squares analysis is provided only as a supplemental check on the results of the dosimetry evaluation. The least-squares analysis was not used to modify the calculated surveillance capsule or reactor pressure vessel neutron exposure. Therefore, Limitation # 2 does not apply. WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-7 Table 6-1 Calculated Fast (E > 1.0 MeV) Neutron Fluence Rate and Fluence at Surveillance Capsule Locations Cycle Total Fluence Rate (n/cm2-s) Cycle Length Time Dual Dual Single (EFPY) (EFPY) 29-degree 31.5-degree 31.5-degree 1 0.91 0.91 9.90E+10 1.08E+11 1.08E+11 2 0.87 1.78 8.03E+10 8.41E+10 8.38E+10 3 1.21 2.99 7.88E+10 8.68E+10 8.66E+10 4 1.21 4.20 5.98E+10 6.35E+10 6.34E+10 5 1.37 5.57 6.07E+10 6.55E+10 6.54E+10 6 1.49 7.06 6.06E+10 6.51E+10 6.50E+10 7 1.41 8.46 6.72E+10 7.44E+10 7.44E+10 8 1.18 9.65 6.00E+10 6.55E+10 6.54E+10 9 1.35 11.00 6.50E+10 7.13E+10 7.11E+10 10 1.40 12.39 6.37E+10 6.94E+10 6.93E+10 11 1.40 13.79 6.62E+10 6.60E+10 12 1.34 15.13 7.17E+10 7.15E+10 13 1.39 16.52 6.82E+10 6.80E+10 14 1.38 17.90 7.75E+10 7.73E+10 15 1.17 19.07 7.25E+10 7.24E+10 16 1.48 20.55 6.96E+10 6.94E+10 17 1.50 22.05 7.03E+10 7.02E+10 18 1.43 23.48 7.00E+10 6.99E+10 19 1.48 24.96 7.08E+10 7.07E+10 20 1.50 26.46 7.09E+10 7.07E+10 WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-8 Table 6-1 Calculated Fast (E > 1.0 MeV) Neutron Fluence Rate and Fluence at Surveillance Capsule Locations (cont.) Total Fluence(1) (n/cm2) Cycle Time (EFPY) U Y V X W Z 1 0.91 3.11E+18 2.85E+18 2.85E+18 3.11E+18 3.10E+18 3.10E+18 2 1.78 5.06E+18 5.06E+18 5.42E+18 5.40E+18 5.40E+18 3 2.99 8.06E+18 8.06E+18 8.73E+18 8.70E+18 8.70E+18 4 4.20 1.03E+19 1.03E+19 1.12E+19 1.11E+19 1.11E+19 5 5.57 1.30E+19 1.30E+19 1.40E+19 1.39E+19 1.39E+19 6 7.06 1.58E+19 1.70E+19 1.70E+19 1.70E+19 7 8.46 1.88E+19 2.03E+19 2.03E+19 2.03E+19 8 9.65 2.10E+19 2.28E+19 2.27E+19 2.27E+19 9 11.00 2.38E+19 2.58E+19 2.58E+19 2.58E+19 10 12.39 2.66E+19 2.89E+19 2.88E+19 2.88E+19 11 13.79 3.18E+19 3.17E+19 3.17E+19 12 15.13 3.48E+19 3.48E+19 3.48E+19 13 16.52 3.78E+19 3.77E+19 3.77E+19 14 17.90 4.12E+19 4.11E+19 4.11E+19 15 19.07 4.39E+19 4.38E+19 4.38E+19 16 20.55 4.71E+19 4.70E+19 4.70E+19 17 22.05 5.05E+19 5.03E+19 5.03E+19 18 23.48 5.36E+19 5.35E+19 5.35E+19 19 24.96 5.69E+19 5.68E+19 5.68E+19 20 26.46 6.03E+19 6.01E+19 6.01E+19 32 7.25E+19 7.25E+19 36 8.14E+19 8.14E+19 40 9.03E+19 9.03E+19 48 1.08E+20 1.08E+20 54 1.21E+20 1.21E+20 60 1.35E+20 1.35E+20 Note:

1. Values beyond Cycle 20 are projected based on the linear average of Cycles 17, 19, and 20.

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Westinghouse Non-Proprietary Class 3 6-9 Table 6-2 Calculated Iron Atom Displacement Rate and Iron Atom Displacements at Surveillance Capsule Locations Iron Atom Displacement Rate Cycle Total (dpa/s) Cycle Length Time Dual Dual Single (EFPY) (EFPY) 29-degree 31.5-degree 31.5-degree 1 0.91 0.91 1.95E-10 2.13E-10 2.12E-10 2 0.87 1.78 1.58E-10 1.65E-10 1.65E-10 3 1.21 2.99 1.55E-10 1.70E-10 1.70E-10 4 1.21 4.20 1.17E-10 1.24E-10 1.24E-10 5 1.37 5.57 1.19E-10 1.28E-10 1.28E-10 6 1.49 7.06 1.18E-10 1.27E-10 1.27E-10 7 1.41 8.46 1.31E-10 1.45E-10 1.45E-10 8 1.18 9.65 1.17E-10 1.28E-10 1.28E-10 9 1.35 11.00 1.27E-10 1.39E-10 1.39E-10 10 1.40 12.39 1.24E-10 1.35E-10 1.35E-10 11 1.40 13.79 1.29E-10 1.29E-10 12 1.34 15.13 1.40E-10 1.40E-10 13 1.39 16.52 1.33E-10 1.33E-10 14 1.38 17.90 1.51E-10 1.51E-10 15 1.17 19.07 1.41E-10 1.41E-10 16 1.48 20.55 1.36E-10 1.36E-10 17 1.50 22.05 1.37E-10 1.37E-10 18 1.43 23.48 1.36E-10 1.36E-10 19 1.48 24.96 1.38E-10 1.38E-10 20 1.50 26.46 1.38E-10 1.38E-10 WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 6-10 Table 6-2 Calculated Iron Atom Displacement Rate and Iron Atom Displacements at Surveillance Capsule Locations (cont.) Total Iron Atom Displacements(1) (dpa) Cycle Time (EFPY) U Y V X W Z 1 0.91 6.12E-03 5.62E-03 5.62E-03 6.12E-03 6.11E-03 6.11E-03 2 1.78 9.97E-03 9.97E-03 1.07E-02 1.06E-02 1.06E-02 3 2.99 1.59E-02 1.59E-02 1.71E-02 1.71E-02 1.71E-02 4 4.20 2.03E-02 2.03E-02 2.19E-02 2.18E-02 2.18E-02 5 5.57 2.54E-02 2.54E-02 2.74E-02 2.73E-02 2.73E-02 6 7.06 3.10E-02 3.33E-02 3.33E-02 3.33E-02 7 8.46 3.68E-02 3.98E-02 3.97E-02 3.97E-02 8 9.65 4.12E-02 4.45E-02 4.45E-02 4.45E-02 9 11.00 4.66E-02 5.05E-02 5.04E-02 5.04E-02 10 12.39 5.20E-02 5.64E-02 5.64E-02 5.64E-02 11 13.79 6.21E-02 6.20E-02 6.20E-02 12 15.13 6.80E-02 6.79E-02 6.79E-02 13 16.52 7.39E-02 7.38E-02 7.38E-02 14 17.90 8.04E-02 8.03E-02 8.03E-02 15 19.07 8.56E-02 8.55E-02 8.55E-02 16 20.55 9.20E-02 9.19E-02 9.19E-02 17 22.05 9.85E-02 9.83E-02 9.83E-02 18 23.48 1.05E-01 1.04E-01 1.04E-01 19 24.96 1.11E-01 1.11E-01 1.11E-01 20 26.46 1.18E-01 1.17E-01 1.17E-01 32 1.42E-01 1.42E-01 36 1.59E-01 1.59E-01 40 1.76E-01 1.76E-01 48 2.11E-01 2.11E-01 54 2.37E-01 2.37E-01 60 2.63E-01 2.63E-01 Note:

1. Values beyond Cycle 20 are projected based on the linear average of Cycles 17, 19, and 20.

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      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-11 Table 6-3 Calculated Surveillance Capsule Lead Factors Total Lead Factors Cycle Time (EFPY) U Y V X W Z 1 0.91 3.76 3.45 3.45 3.76 3.75 3.75 2 1.78 3.59 3.59 3.84 3.83 3.83 3 2.99 3.51 3.51 3.80 3.79 3.79 4 4.20 3.56 3.56 3.84 3.83 3.83 5 5.57 3.58 3.58 3.86 3.85 3.85 6 7.06 3.61 3.89 3.88 3.88 7 8.46 3.62 3.91 3.91 3.91 8 9.65 3.61 3.91 3.90 3.90 9 11.00 3.59 3.90 3.89 3.89 10 12.39 3.59 3.90 3.89 3.89 11 13.79 3.90 3.89 3.89 12 15.13 3.91 3.90 3.90 13 16.52 3.92 3.91 3.91 14 17.90 3.92 3.91 3.91 15 19.07 3.92 3.92 3.92 16 20.55 3.92 3.91 3.91 17 22.05 3.92 3.91 3.91 18 23.48 3.92 3.91 3.91 19 24.96 3.92 3.91 3.91 20 26.46 3.91 3.91 3.91 32 3.90 3.90 36 3.89 3.89 40 3.89 3.89 48 3.88 3.88 54 3.88 3.88 60 3.87 3.87 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-12 Table 6-4 Calculated Maximum Fast (E > 1.0 MeV) Neutron Fluence Rate at the Pressure Vessel Clad/Base Metal Interface Fluence Rate (n/cm2-s) Cycle Total Cycle Length Time Elevation (EFPY) (EFPY) 0° 15° 30° 45° Maximum of Max.(1) (cm) 1 0.91 0.91 1.33E+10 2.16E+10 2.51E+10 2.87E+10 2.87E+10 -39 2 0.87 1.78 1.32E+10 2.12E+10 2.12E+10 2.25E+10 2.45E+10 71 3 1.21 2.99 1.15E+10 1.71E+10 2.03E+10 2.32E+10 2.32E+10 17 4 1.21 4.20 1.04E+10 1.55E+10 1.56E+10 1.59E+10 1.71E+10 11 5 1.37 5.57 8.23E+09 1.36E+10 1.61E+10 1.69E+10 1.69E+10 71 6 1.49 7.06 9.71E+09 1.47E+10 1.64E+10 1.66E+10 1.72E+10 71 7 1.41 8.46 8.37E+09 1.33E+10 1.75E+10 1.86E+10 1.86E+10 71 8 1.18 9.65 8.58E+09 1.30E+10 1.53E+10 1.69E+10 1.69E+10 17 9 1.35 11.00 8.82E+09 1.42E+10 1.71E+10 1.88E+10 1.88E+10 71 10 1.40 12.39 8.71E+09 1.35E+10 1.65E+10 1.79E+10 1.79E+10 -35 11 1.40 13.79 8.87E+09 1.40E+10 1.61E+10 1.72E+10 1.72E+10 -89 12 1.34 15.13 9.86E+09 1.57E+10 1.73E+10 1.80E+10 1.83E+10 11 13 1.39 16.52 1.09E+10 1.62E+10 1.70E+10 1.69E+10 1.87E+10 71 14 1.38 17.90 1.02E+10 1.48E+10 1.80E+10 1.98E+10 1.98E+10 -35 15 1.17 19.07 9.03E+09 1.45E+10 1.75E+10 1.84E+10 1.84E+10 71 16 1.48 20.55 9.05E+09 1.48E+10 1.68E+10 1.80E+10 1.80E+10 -87 17 1.50 22.05 9.52E+09 1.44E+10 1.69E+10 1.83E+10 1.84E+10 71 18 1.43 23.48 8.97E+09 1.34E+10 1.68E+10 1.78E+10 1.78E+10 -39 19 1.48 24.96 8.74E+09 1.35E+10 1.70E+10 1.82E+10 1.82E+10 71 20 1.50 26.46 8.91E+09 1.37E+10 1.71E+10 1.85E+10 1.85E+10 -39 Note:

1. The elevation represents the distance between the maximum exposure location and the core midplane.

WCAP-18607-NP March 2021 Revision 0 

    *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-13 Table 6-5 Calculated Maximum Fast (E > 1.0 MeV) Neutron Fluence at the Pressure Vessel Clad/Base Metal Interface Fluence(1) (n/cm2) Cycle Total Cycle Length Time Elevation (EFPY) (EFPY) 0° 15° 30° 45° Maximum of Max.(2) (cm) 1 0.91 0.91 3.84E+17 6.21E+17 7.23E+17 8.26E+17 8.26E+17 -39 2 0.87 1.78 7.31E+17 1.18E+18 1.28E+18 1.41E+18 1.41E+18 17 3 1.21 2.99 1.17E+18 1.83E+18 2.05E+18 2.30E+18 2.30E+18 17 4 1.21 4.20 1.57E+18 2.42E+18 2.65E+18 2.90E+18 2.90E+18 17 5 1.37 5.57 1.91E+18 3.00E+18 3.33E+18 3.62E+18 3.62E+18 17 6 1.49 7.06 2.36E+18 3.67E+18 4.07E+18 4.38E+18 4.38E+18 17 7 1.41 8.46 2.73E+18 4.26E+18 4.85E+18 5.20E+18 5.20E+18 17 8 1.18 9.65 3.05E+18 4.74E+18 5.42E+18 5.83E+18 5.83E+18 17 9 1.35 11.00 3.43E+18 5.35E+18 6.15E+18 6.62E+18 6.62E+18 17 10 1.40 12.39 3.81E+18 5.93E+18 6.86E+18 7.41E+18 7.41E+18 17 11 1.40 13.79 4.20E+18 6.55E+18 7.56E+18 8.15E+18 8.15E+18 17 12 1.34 15.13 4.62E+18 7.21E+18 8.29E+18 8.92E+18 8.92E+18 17 13 1.39 16.52 5.10E+18 7.92E+18 9.04E+18 9.65E+18 9.65E+18 17 14 1.38 17.90 5.54E+18 8.56E+18 9.82E+18 1.05E+19 1.05E+19 17 15 1.17 19.07 5.87E+18 9.10E+18 1.05E+19 1.12E+19 1.12E+19 17 16 1.48 20.55 6.29E+18 9.79E+18 1.12E+19 1.20E+19 1.20E+19 17 17 1.50 22.05 6.74E+18 1.05E+19 1.20E+19 1.29E+19 1.29E+19 17 18 1.43 23.48 7.15E+18 1.11E+19 1.28E+19 1.37E+19 1.37E+19 17 19 1.48 24.96 7.56E+18 1.17E+19 1.36E+19 1.45E+19 1.45E+19 17 20 1.50 26.46 7.98E+18 1.24E+19 1.44E+19 1.54E+19 1.54E+19 65 32 9.56E+18 1.48E+19 1.74E+19 1.86E+19 1.86E+19 71 36 1.07E+19 1.65E+19 1.95E+19 2.09E+19 2.09E+19 71 40 1.18E+19 1.83E+19 2.17E+19 2.32E+19 2.32E+19 71 48 1.41E+19 2.18E+19 2.60E+19 2.79E+19 2.79E+19 71 54 1.58E+19 2.44E+19 2.92E+19 3.13E+19 3.13E+19 71 60 1.76E+19 2.70E+19 3.24E+19 3.48E+19 3.48E+19 71 Notes:

1. Values beyond Cycle 20 are projected based on the linear average of Cycles 17, 19, and 20.
2. The elevation represents the distance between the maximum exposure location and the core midplane.

WCAP-18607-NP March 2021 Revision 0 

    *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-14 Table 6-6 Calculated Maximum Iron Atom Displacement Rate at the Pressure Vessel Clad/Base Metal Interface Iron Atom Displacement Rate (dpa/s) Cycle Total Cycle Length Time Elevation (EFPY) (EFPY) 0° 15° 30° 45° Maximum of Max.(1) (cm) 1 0.91 0.91 2.06E-11 3.30E-11 3.87E-11 4.51E-11 4.51E-11 -39 2 0.87 1.78 2.04E-11 3.24E-11 3.27E-11 3.54E-11 3.73E-11 71 3 1.21 2.99 1.78E-11 2.62E-11 3.13E-11 3.66E-11 3.66E-11 17 4 1.21 4.20 1.61E-11 2.37E-11 2.40E-11 2.51E-11 2.62E-11 11 5 1.37 5.57 1.28E-11 2.09E-11 2.47E-11 2.66E-11 2.66E-11 71 6 1.49 7.06 1.50E-11 2.26E-11 2.52E-11 2.62E-11 2.62E-11 71 7 1.41 8.46 1.30E-11 2.04E-11 2.70E-11 2.93E-11 2.93E-11 71 8 1.18 9.65 1.33E-11 2.00E-11 2.36E-11 2.66E-11 2.66E-11 17 9 1.35 11.00 1.37E-11 2.18E-11 2.63E-11 2.96E-11 2.96E-11 71 10 1.40 12.39 1.35E-11 2.07E-11 2.54E-11 2.82E-11 2.82E-11 -35 11 1.40 13.79 1.37E-11 2.15E-11 2.47E-11 2.70E-11 2.70E-11 -89 12 1.34 15.13 1.53E-11 2.40E-11 2.66E-11 2.84E-11 2.84E-11 -89 13 1.39 16.52 1.69E-11 2.48E-11 2.62E-11 2.67E-11 2.86E-11 71 14 1.38 17.90 1.57E-11 2.28E-11 2.77E-11 3.11E-11 3.11E-11 -39 15 1.17 19.07 1.40E-11 2.23E-11 2.69E-11 2.90E-11 2.90E-11 71 16 1.48 20.55 1.40E-11 2.28E-11 2.59E-11 2.84E-11 2.84E-11 -85 17 1.50 22.05 1.47E-11 2.21E-11 2.61E-11 2.89E-11 2.89E-11 71 18 1.43 23.48 1.39E-11 2.06E-11 2.59E-11 2.81E-11 2.81E-11 -39 19 1.48 24.96 1.35E-11 2.07E-11 2.62E-11 2.87E-11 2.87E-11 71 20 1.50 26.46 1.38E-11 2.11E-11 2.64E-11 2.92E-11 2.92E-11 -39 Note:

1. The elevation represents the distance between the maximum exposure location and the core midplane.

WCAP-18607-NP March 2021 Revision 0 

   *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-15 Table 6-7 Calculated Maximum Iron Atom Displacements at the Pressure Vessel Clad/Base Metal Interface Iron Atom Displacements(1) (dpa) Cycle Total Cycle Length Time Elevation (EFPY) (EFPY) 0° 15° 30° 45° Maximum of Max.(2) (cm) 1 0.91 0.91 5.93E-04 9.52E-04 1.11E-03 1.30E-03 1.30E-03 -39 2 0.87 1.78 1.13E-03 1.80E-03 1.97E-03 2.22E-03 2.22E-03 17 3 1.21 2.99 1.81E-03 2.80E-03 3.16E-03 3.62E-03 3.62E-03 17 4 1.21 4.20 2.42E-03 3.71E-03 4.08E-03 4.57E-03 4.57E-03 17 5 1.37 5.57 2.96E-03 4.59E-03 5.13E-03 5.70E-03 5.70E-03 17 6 1.49 7.06 3.65E-03 5.62E-03 6.27E-03 6.89E-03 6.89E-03 17 7 1.41 8.46 4.23E-03 6.53E-03 7.47E-03 8.19E-03 8.19E-03 17 8 1.18 9.65 4.73E-03 7.27E-03 8.35E-03 9.18E-03 9.18E-03 17 9 1.35 11.00 5.31E-03 8.20E-03 9.47E-03 1.04E-02 1.04E-02 17 10 1.40 12.39 5.90E-03 9.10E-03 1.06E-02 1.17E-02 1.17E-02 17 11 1.40 13.79 6.50E-03 1.00E-02 1.16E-02 1.28E-02 1.28E-02 17 12 1.34 15.13 7.14E-03 1.11E-02 1.28E-02 1.40E-02 1.40E-02 17 13 1.39 16.52 7.89E-03 1.21E-02 1.39E-02 1.52E-02 1.52E-02 17 14 1.38 17.90 8.57E-03 1.31E-02 1.51E-02 1.65E-02 1.65E-02 17 15 1.17 19.07 9.08E-03 1.40E-02 1.61E-02 1.76E-02 1.76E-02 17 16 1.48 20.55 9.74E-03 1.50E-02 1.73E-02 1.89E-02 1.89E-02 17 17 1.50 22.05 1.04E-02 1.61E-02 1.86E-02 2.03E-02 2.03E-02 17 18 1.43 23.48 1.11E-02 1.70E-02 1.97E-02 2.15E-02 2.15E-02 17 19 1.48 24.96 1.17E-02 1.80E-02 2.09E-02 2.29E-02 2.29E-02 65 20 1.50 26.46 1.23E-02 1.90E-02 2.22E-02 2.42E-02 2.42E-02 65 32 1.48E-02 2.27E-02 2.68E-02 2.93E-02 2.93E-02 71 34 1.66E-02 2.54E-02 3.01E-02 3.29E-02 3.29E-02 71 40 1.83E-02 2.80E-02 3.34E-02 3.66E-02 3.66E-02 71 48 2.19E-02 3.34E-02 4.00E-02 4.39E-02 4.39E-02 71 54 2.45E-02 3.74E-02 4.50E-02 4.93E-02 4.93E-02 71 60 2.72E-02 4.15E-02 4.99E-02 5.48E-02 5.48E-02 71 Notes:

1. Values beyond Cycle 20 are projected based on the linear average of Cycles 17, 19, and 20.
2. The elevation represents the distance between the maximum exposure location and the core midplane.

WCAP-18607-NP March 2021 Revision 0 

   *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-16 Table 6-8 Calculated Maximum Fast Neutron Fluence (E > 1.0 MeV) at Pressure Vessel Welds and Shells Fast Neutron (E > 1.0 MeV) Fluence (n/cm2) Material 26.5 EFPY 32 EFPY 36 EFPY 40 EFPY Outlet Nozzle to Nozzle Shell 8.14E+15 9.77E+15 1.09E+16 1.21E+16 Weld - Lowest Extent Inlet Nozzle to Nozzle Shell 1.42E+16 1.72E+16 1.93E+16 2.15E+16 Weld - Lowest Extent Upper Shell Plates 2.51E+17 3.04E+17 3.43E+17 3.81E+17 Upper Shell Long. Weld 1 2.49E+17 3.01E+17 3.39E+17 3.77E+17 Upper Shell Long. Weld 2 1.77E+17 2.14E+17 2.40E+17 2.66E+17 Upper Shell Long. Weld 3 1.32E+17 1.58E+17 1.77E+17 1.96E+17 Intermediate to Upper Shell Weld 2.95E+17 3.57E+17 4.02E+17 4.47E+17 Intermediate Shell Plates 1.54E+19 1.86E+19 2.09E+19 2.32E+19 Intermediate Shell Long. Weld 1 7.97E+18 9.56E+18 1.07E+19 1.18E+19 Intermediate Shell Long. Weld 2 9.67E+18 1.17E+19 1.31E+19 1.45E+19 Intermediate Shell Long. Weld 3 9.50E+18 1.15E+19 1.29E+19 1.43E+19 Lower to Intermediate Shell Weld 1.54E+19 1.86E+19 2.09E+19 2.32E+19 Lower Shell Plates 1.53E+19 1.85E+19 2.08E+19 2.31E+19 Lower Shell Long. Weld 1 7.90E+18 9.46E+18 1.06E+19 1.17E+19 Lower Shell Long. Weld 2 1.43E+19 1.73E+19 1.94E+19 2.15E+19 Lower Shell Long. Weld 3 1.43E+19 1.73E+19 1.94E+19 2.15E+19 Lower Shell to Lower Closure 4.58E+15 5.53E+15 6.21E+15 6.89E+15 Head Weld WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-17 Table 6-8 Calculated Maximum Fast Neutron Fluence (E > 1.0 MeV) at Pressure Vessel Welds and Shells (cont.) Fast Neutron (E > 1.0 MeV) Fluence (n/cm2) Material 48 EFPY 54 EFPY 60 EFPY Outlet Nozzle to Nozzle Shell 1.45E+16 1.62E+16 1.80E+16 Weld - Lowest Extent Inlet Nozzle to Nozzle Shell 2.58E+16 2.90E+16 3.22E+16 Weld - Lowest Extent Upper Shell Plates 4.58E+17 5.15E+17 5.73E+17 Upper Shell Long. Weld 1 4.53E+17 5.10E+17 5.67E+17 Upper Shell Long. Weld 2 3.19E+17 3.59E+17 3.98E+17 Upper Shell Long. Weld 3 2.34E+17 2.63E+17 2.91E+17 Intermediate to Upper Shell Weld 5.37E+17 6.04E+17 6.72E+17 Intermediate Shell Plates 2.79E+19 3.13E+19 3.48E+19 Intermediate Shell Long. Weld 1 1.41E+19 1.58E+19 1.76E+19 Intermediate Shell Long. Weld 2 1.74E+19 1.95E+19 2.17E+19 Intermediate Shell Long. Weld 3 1.71E+19 1.92E+19 2.13E+19 Lower to Intermediate Shell Weld 2.78E+19 3.13E+19 3.47E+19 Lower Shell Plates 2.78E+19 3.13E+19 3.47E+19 Lower Shell Long. Weld 1 1.40E+19 1.57E+19 1.74E+19 Lower Shell Long. Weld 2 2.58E+19 2.90E+19 3.23E+19 Lower Shell Long. Weld 3 2.58E+19 2.90E+19 3.23E+19 Lower Shell to Lower Closure 8.26E+15 9.28E+15 1.03E+16 Head Weld WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-18 Table 6-9 Calculated Maximum Iron Atom Displacements at Pressure Vessel Welds and Shells Iron Atom Displacements (dpa) Material 26.5 EFPY 32 EFPY 36 EFPY 40 EFPY Outlet Nozzle to Nozzle Shell 5.95E-05 7.15E-05 8.01E-05 8.87E-05 Weld - Lowest Extent Inlet Nozzle to Nozzle Shell 7.47E-05 8.98E-05 1.01E-04 1.12E-04 Weld - Lowest Extent Upper Shell Plates 4.21E-04 5.10E-04 5.74E-04 6.38E-04 Upper Shell Long. Weld 1 4.17E-04 5.05E-04 5.68E-04 6.32E-04 Upper Shell Long. Weld 2 3.02E-04 3.64E-04 4.09E-04 4.54E-04 Upper Shell Long. Weld 3 2.26E-04 2.71E-04 3.04E-04 3.37E-04 Intermediate to Upper Shell Weld 4.90E-04 5.94E-04 6.68E-04 7.43E-04 Intermediate Shell Plates 2.42E-02 2.93E-02 3.29E-02 3.66E-02 Intermediate Shell Long. Weld 1 1.23E-02 1.48E-02 1.66E-02 1.83E-02 Intermediate Shell Long. Weld 2 1.54E-02 1.85E-02 2.08E-02 2.31E-02 Intermediate Shell Long. Weld 3 1.51E-02 1.82E-02 2.04E-02 2.26E-02 Lower to Intermediate Shell Weld 2.42E-02 2.93E-02 3.29E-02 3.65E-02 Lower Shell Plates 2.41E-02 2.92E-02 3.28E-02 3.65E-02 Lower Shell Long. Weld 1 1.22E-02 1.46E-02 1.64E-02 1.81E-02 Lower Shell Long. Weld 2 2.20E-02 2.66E-02 2.99E-02 3.32E-02 Lower Shell Long. Weld 3 2.20E-02 2.66E-02 2.99E-02 3.32E-02 Lower Shell to Lower Closure 2.96E-05 3.57E-05 4.01E-05 4.45E-05 Head Weld WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-19 Table 6-9 Calculated Maximum Iron Atom Displacements at Pressure Vessel Welds and Shells (cont.) Iron Atom Displacements (dpa) Material 48 EFPY 54 EFPY 60 EFPY Outlet Nozzle to Nozzle Shell 1.06E-04 1.19E-04 1.32E-04 Weld - Lowest Extent Inlet Nozzle to Nozzle Shell 1.33E-04 1.50E-04 1.66E-04 Weld - Lowest Extent Upper Shell Plates 7.67E-04 8.63E-04 9.59E-04 Upper Shell Long. Weld 1 7.59E-04 8.55E-04 9.50E-04 Upper Shell Long. Weld 2 5.44E-04 6.11E-04 6.78E-04 Upper Shell Long. Weld 3 4.02E-04 4.51E-04 5.00E-04 Intermediate to Upper Shell Weld 8.93E-04 1.00E-03 1.12E-03 Intermediate Shell Plates 4.39E-02 4.93E-02 5.48E-02 Intermediate Shell Long. Weld 1 2.19E-02 2.45E-02 2.72E-02 Intermediate Shell Long. Weld 2 2.76E-02 3.10E-02 3.44E-02 Intermediate Shell Long. Weld 3 2.71E-02 3.04E-02 3.38E-02 Lower to Intermediate Shell Weld 4.38E-02 4.92E-02 5.47E-02 Lower Shell Plates 4.38E-02 4.92E-02 5.47E-02 Lower Shell Long. Weld 1 2.16E-02 2.43E-02 2.69E-02 Lower Shell Long. Weld 2 3.98E-02 4.48E-02 4.97E-02 Lower Shell Long. Weld 3 3.98E-02 4.48E-02 4.97E-02 Lower Shell to Lower Closure 5.33E-05 5.99E-05 6.65E-05 Head Weld WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-20 Figure 6-1 Seabrook Unit 1 Plan View of the Reactor Geometry at the Core Midplane Single Surveillance Capsule Configuration WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-21 Figure 6-2 Seabrook Unit 1 Plan View of the Reactor Geometry at the Core Midplane Dual Surveillance Capsule Configuration WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-22 Figure 6-3 Seabrook Unit 1 Section View of the Reactor Geometry at 0-Degrees WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-23 Figure 6-4 Seabrook Unit 1 Section View of the Reactor Geometry at 22-Degrees WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 6-24 Figure 6-5 Seabrook Unit 1 Section View of the Reactor Geometry at 67-Degrees WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 7-1 7 SURVEILLANCE CAPSULE REMOVAL SCHEDULE The following surveillance capsule removal schedule (Table 7-1) meets the requirements of ASTM E185-82 [10] with consideration of [21]. Table 7-1 Surveillance Capsule Withdrawal Schedule Fluence Capsule Capsule Location Lead Factor Withdrawal EFPY(1) (n/cm2, E > 1.0 MeV) 0.91 U 31.5° Dual 3.76 0.311 x 1019 (EOC 1) 5.57 Y 29.0° Dual 3.58 1.30 x 1019 (EOC 5) 12.39 V 29.0° Dual 3.59 2.66 x 1019 (EOC 10) 26.46 X 31.5° Dual 3.91 6.03 x 1019 (EOC 20) W 31.5° Single 3.91 Standby(2) --- Z 31.5° Single 3.91 Standby(2) --- Notes:

1. Effective full-power years (EFPY) from plant startup. EOC = End-of-cycle.
2. These capsules should be removed within three cycles of the removal of Capsule X, consistent with Commitment
           # 20 of the license renewal application (Section A.3) [22].

WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 8-1 8 REFERENCES

1. U.S. Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, Regulatory Guide 1.99, Revision 2, Radiation Embrittlement of Reactor Vessel Materials, May 1988.

[Agencywide Documents Access and Management System (ADAMS) Accession Number ML003740284]

2. Westinghouse Report WCAP-10110, Rev. 0, Public Service Company of New Hampshire Seabrook Station Unit No. 1 Reactor Vessel Radiation Surveillance Program, March 1983.
3. ASTM E185-79, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels, 1979.
4. Appendix G of the ASME Boiler and Pressure Vessel (B&PV) Code, Section XI, Division 1, Fracture Toughness Criteria for Protection Against Failure.
5. ASTM E208, Standard Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels, ASTM.
6. ASTM E399, Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness Klc of Metallic Materials, ASTM.
7. CE Report NPSD-1039, Rev. 2, Best Estimate Copper and Nickel Vlues in CE Fabricated Reactor Vessel Welds, CEOG Task 902, C-E Owners Group, June 1997.
8. Material Certification Report, Lukens Steel Company, Job No. 733142-005, Plate Heat No.

D1136-2, Plate Code No. R-1803-3, J.M. Arnold, July 10, 1975.

9. 10 CFR 50, Appendix H, Reactor Vessel Material Surveillance Program Requirements, U.S.

Nuclear Regulatory Commission, Federal Register, November 29, 2019.

10. ASTM E185-82, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels, American Society for Testing and Materials, 1982.
11. ASTM E23-18, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials, 2018.
12. ASTM E2298-18, Standard Test Method for Instrumented Impact Testing of Metallic Materials, 2018.
13. ASTM A370-18, Standard Test Methods and Definitions for Mechanical Testing of Steel Products, 2018.
14. ASTM E8/E8M-16a, Standard Test Methods for Tension Testing of Metallic Materials, 2016.
15. ASTM E21-17, Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials, 2017.

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Westinghouse Non-Proprietary Class 3 8-2

16. Westinghouse Report WCAP-16526-NP, Rev. 0, Analysis of Capsule V from FPL Energy -

Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program, March 2006.

17. ASTM E853-18, Standard Practice for Analysis and Interpretation of Light-Water Reactor Surveillance Neutron Exposure Results, 2018.
18. ASTM E693-94, Standard Practice for Characterizing Neutron Exposures in Iron and Low Alloy Steels in Terms of Displacements Per Atom (DPA), E706 (ID), 1994.
19. U.S. Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, Regulatory Guide 1.190, Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence, March 2001. [ADAMS Accession Number ML010890301]
20. Westinghouse Report WCAP-18124-NP-A, Rev. 0, Fluence Determination with RAPTOR-M3G and FERRET, July 2018. [ADAMS Accession Number ML18204A010]
21. NUREG-1801, Rev. 2, Generic Aging Lessons Learned (GALL) Report, December 2010, U.S.

Nuclear Regulatory Commission Report. [ADAMS Accession Number ML103490041]

22. Seabrook Station License Renewal Application, May 2010. [Available on the NRCs Seabrook LR website: https://www.nrc.gov/reactors/operating/licensing/renewal/applications/seabrook.html]

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Westinghouse Non-Proprietary Class 3 A-1 APPENDIX A VALIDATION OF THE RADIATION TRANSPORT MODELS BASED ON NEUTRON DOSIMETRY MEASUREMENTS NEUTRON DOSIMETRY Comparisons of measured dosimetry results to both the calculated and least-squares adjusted values for Capsules U, Y, V, and X are provided in this appendix. The sensor sets have been analyzed in accordance with the current dosimetry evaluation methodology described in Regulatory Guide 1.190, Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence [A-1]. One of the main purposes for providing this material is to demonstrate that the overall measurements agree with the calculated and least-squares adjusted values to within 20% as specified by Regulatory Guide 1.190, thus serving to validate the calculated neutron exposures reported in Section 6.2. A.1.1 Sensor Reaction Rate Determinations In this section, the results of the evaluations of Capsules U, Y, V, and X are presented. The capsules designation, locations within the reactor, and time of withdrawal are as follows: Azimuthal Withdrawal Irradiation Time Capsule Location Time (EFPY) U 58.5º End of Cycle 1 0.91 V 241º End of Cycle 5 5.57 Y 61º End of Cycle 10 12.39 X 238.5º End of Cycle 20 26.46 WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-2 The passive neutron sensors included in these evaluations are summarized as follows: Sensor Material Reaction of Interest Capsule U Capsule Y Capsule V Capsule X Copper Cu-63 (n,) Co-60 X X X X Iron Fe-54 (n,p) Mn-54 X X X X Nickel Ni-58 (n,p) Co-58 X X X X Uranium-238 U-238 (n,f) Cs-137 X X(2) X X Neptunium-237 Np-237 (n,f) Cs-137 X X X X Cobalt-Aluminum(1) Co-59 (n,) Co-60 X X X X Notes:

1. The cobalt-aluminum sensors include both bare and cadmium-covered sensors.
2. These dosimeter sensor results are rejected due to large statistical scattering in the measurement data.

Since all of the dosimetry monitors were located at the radial center of the material test specimen array, gradient corrections were not required for these reaction rates. Pertinent physical and nuclear characteristics of the passive neutron sensors analyzed are listed in Table A-1. The use of passive monitors does not yield a direct measure of the energy-dependent neutron exposure rate at the point of interest. Rather, the activation or fission process is a measure of the integrated effect that the time- and energy-dependent neutron exposure rate has on the target material over the course of the irradiation period. An accurate assessment of the average neutron exposure rate incident on the various monitors may be derived from the activation measurements only if the irradiation parameters are well known. In particular, the following variables are of interest: The measured specific activity of each monitor. The physical characteristics of each monitor. The operating history of the reactor. The energy response of each monitor. The neutron energy spectrum at the monitor location. The radiometric counting of the sensors from Capsule X was carried out by Pace Analytical Services, Inc. The radiometric counting followed established ASTM procedures. The prevously withdrawn in-vessel Capsules U, Y, and X were re-evaluated using the current calculational models. The operating history of the reactor over the irradiation periods was based on the monthly power generation of Seabrook Unit 1 from initial reactor criticality through the end of the dosimetry evaluation period. For the sensor sets utilized in the surveillance capsules, the half-lives of the product isotopes are long enough that a monthly histogram describing reactor operation has proven to be an adequate representation for use in radioactive decay corrections for the reactions of interest in the exposure evaluations. The irradiation history for Cycle 1 through Cycle 10 is in [A-2]. The monthly thermal generation data for Cycle 11 through Cycle 13 was approximated by evenly splitting the cycle length over the number of months in each cycle. Because of the large amount of time between Cycle 11 through Cycle 13 and when Capsule X was withdrawn from the reactor, there is no practical impact of this approximation on the Capsule X dosimetry. WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-3 The monthly thermal generation data for Cycle 14 through Cycle 20 were provided by NextEra. Thee irradiation history for Cycle 11 through Cycle 20 is summarized in Table A-2. Having the measured specific activities, the physical characteristics of the sensors, and the operating history of the reactor, reaction rates referenced to full-power operation were determined from the following equation: A R P N FY C 1 e e , P where: R = Reaction rate averaged over the irradiation period and referenced to operation at a core power level of Pref (rps/nucleus). A = Measured specific activity (dps/g). N0 = Number of target element atoms per gram of sensor. F = Atom fraction of the target isotope in the target element. Y = Number of product atoms produced per reaction. Pj = Average core power level during irradiation Period j (MW). Pref = Maximum or reference power level of the reactor (MW). Cj = Calculated ratio of (E > 1.0 MeV) during irradiation Period j to the time weighted average (E > 1.0 MeV) over the entire irradiation period. 

                            =   Decay constant of the product isotope (1/sec).

tj = Length of irradiation Period j (sec). td,j = Decay time following irradiation Period j (sec). The summation is carried out over the total number of monthly intervals comprising the irradiation period. In the equation describing the reaction rate calculation, the Ratio [Pj]/[Pref] accounts for month-by-month variation of reactor core power level within any given fuel cycle as well as over multiple fuel cycles. The Ratio Cj, which was calculated for each fuel cycle using the transport methodology discussed in Section 6.2, accounts for the change in sensor reaction rates caused by variations in exposure rate level induced by changes in core spatial power distributions from fuel cycle to fuel cycle. For a single-cycle irradiation, Cj is normally taken to be 1.0. However, for multiple-cycle irradiations, the additional Cj term should be WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-4 employed. The impact of changing exposure rate levels for constant power operation can be quite significant for sensor sets that have been irradiated for many cycles in a reactor that has transitioned from non-low-leakage to low-leakage fuel management or for sensor sets contained in surveillance capsules that have been moved from one capsule location to another. The fuel-cycle-specific neutron exposure rate values are used to compute cycle-dependent values for Cj values at the radial and azimuthal center of the respective capsules at core midplane. Prior to using the measured reaction rates in the least-squares evaluations of the dosimetry sensor sets, additional corrections were made to the U-238 measurements to account for the presence of 235U impurities in the sensors, as well as to adjust for the build-in of plutonium isotopes over the course of the irradiation. Corrections were also made to the U-238 and Np-237 sensor reaction rates to account for gamma-ray-induced fission reactions that occurred over the course of the surveillance capsule irradiations. The correction factors corresponding to the Seabrook Unit 1 fission sensor reaction rates are summarized as follows: Correction Capsule U Capsule Y Capsule V Capsule X U-235 Impurity/Pu Build-in 0.872 0.833 0.788 0.683 U-238 (,f) 0.966 0.967 0.967 0.966 Net U-238 Correction 0.8472 0.806 0.762 0.660 Np-237 (,f) 0.990 0.990 0.990 0.990 The correction factors were applied in a multiplicative fashion to the decay-corrected cadmium-covered fission sensor reaction rates. Results of the sensor reaction rate determinations for the in-vessel Capsules U, Y, V, and X are given in Table A-3 through Table A-6. In Table A-3 through Table A-6, the measured specific activities, decay-corrected saturated specific activities, and computed reaction rates for each sensor are listed. A.1.2 Least-Squares Evaluation of Sensor Sets Least-squares adjustment methods provide the capability of combining the measurement data with the corresponding neutron transport calculations resulting in a best-estimate neutron energy spectrum with associated uncertainties. Best-estimates for key exposure parameters such as fluence rate (E > 1.0 MeV) or dpa/s along with their uncertainties are then easily obtained from the adjusted spectrum. In general, the least-squares method, as applied to dosimetry evaluations, act to reconcile the measured sensor reaction rate data, dosimetry reaction cross-sections, and the calculated neutron energy spectrum within their respective uncertainties. For example, R i R i ( ig ig )( g g ) g WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-5 relates a set of measured reaction rates, Ri, to a single neutron spectrum, g, through the multigroup dosimeter reaction cross-sections, ig, each with an uncertainty . The primary objective of the least-squares evaluation is to produce unbiased estimates of the neutron exposure parameters at the location of the measurement. For the least-squares evaluation of the Seabrook Unit 1 dosimetry, the FERRET code [A-3] was employed to combine the results of the plant-specific neutron transport calculations and sensor set reaction rate measurements to determine the best-estimate values of exposure parameters (fluence rate (E > 1.0 MeV) and dpa) and their associated uncertainties. The application of the least-squares methodology requires the following input:

1. The calculated neutron energy spectrum and associated uncertainties at the measurement location.
2. The measured reaction rates and associated uncertainty for each sensor contained in the multiple foil set.
3. The energy-dependent dosimetry reaction cross-sections and associated uncertainties for each sensor contained in the multiple foil sensor set.

For the Seabrook Unit 1 application, the calculated neutron spectrum was obtained from the results of plant-specific neutron transport calculations described in Section 6.2. The sensor reaction rates were derived from the measured specific activities using the procedures described in Section A.1.1. The dosimetry reaction cross-sections and uncertainties were obtained from the SNLRML dosimetry cross-section library [A-4]. The uncertainties associated with the measured reaction rates, dosimetry cross-sections, and calculated neutron spectrum were input to the least-squares procedure in the form of variances and covariances. The assignment of the input uncertainties followed the guidance provided in ASTM E944, Standard Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance [A-5]. The following provides a summary of the uncertainties associated with the least-squares evaluation of the Seabrook Unit 1 surveillance capsule sensor sets. Reaction Rate Uncertainties The overall uncertainty associated with the measured reaction rates includes components due to the basic measurement process, irradiation history corrections, and corrections for competing reactions. A high level of accuracy in the reaction rate determinations is ensured by utilizing laboratory procedures that conform to the ASTM National Consensus Standards for reaction rate determinations for each sensor type. After combining all of these uncertainty components, the sensor reaction rates derived from the counting and data evaluation procedures were assigned the following net uncertainties for input to the least-squares evaluation: WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-6 Reaction Uncertainty 63 Cu (n,) 60Co 5% 54 Fe (n,p) 54Mn 5% 58 Ni (n,p) 58Co 5% 59 Co (n,) 60Co 5% 238 U (n,f) FP 10% 237 Np (n,f) FP 10% These uncertainties are given at the 1 level. Dosimetry Cross-Section Uncertainties The reaction rate cross-sections used in the least-squares evaluations were taken from the SNLRML library. This data library provides reaction cross-sections and associated uncertainties, including covariances, for 66 dosimetry sensors in common use. Both cross-sections and uncertainties are provided in a fine multigroup structure for use in least-squares adjustment applications. These cross-sections were compiled from recent cross-section evaluations, and they have been tested for accuracy and consistency for least-squares evaluations. Further, the library has been empirically tested for use in fission spectra determination, as well as in the fluence and energy characterization of 14 MeV neutron sources. For sensors included in the Seabrook Unit 1 surveillance program, the following uncertainties in the fission spectrum averaged cross-sections are provided in the SNLRML documentation package: Reaction Uncertainty Cu-63 (n,) Co-60 4.08-4.16% Fe-54 (n,p) Mn-54 3.05-3.11% Ni-58 (n,p) Co-58 4.49-4.56% Co-59 (n,) Co-60 0.79-3.59% U-238 (n,f) 0.54-0.64% Np-237 (n,f) 10.32-10.97% These tabulated ranges provide an indication of the dosimetry cross-section uncertainties associated with the sensor sets used in LWR irradiations. Calculated Neutron Spectrum The neutron spectra inputs to the least-squares adjustment procedure were obtained directly from the results of plant-specific transport calculations for each surveillance capsule irradiation period and location. The spectrum for each capsule was input in an absolute sense (rather than as simply a relative spectral shape). WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-7 Therefore, within the constraints of the assigned uncertainties, the calculated data were treated equally with the measurements. While the uncertainties associated with the reaction rates were obtained from the measurement procedures and counting benchmarks and the dosimetry cross-section uncertainties were supplied directly with the SNLRML library, the uncertainty matrix for the calculated spectrum was constructed from the following relationship: Mgg' R 2n Rg

  • Rg'
  • Pgg' where Rn specifies an overall fractional normalization uncertainty and the fractional uncertainties Rg and Rg' specify additional random groupwise uncertainties that are correlated with a correlation matrix given by:

Pgg = [1- ]gg + e-H where: (g g' ) 2 H 2 2 The first term in the correlation matrix equation specifies purely random uncertainties, while the second term describes the short-range correlations over a group range ( specifies the strength of the latter term). The value of is 1.0 when g = g, and is 0.0 otherwise. The set of parameters defining the input covariance matrix for the Seabrook Unit 1 calculated spectra was as follows: Exposure Rate Normalization Uncertainty (Rn) 15% Exposure Rate Group Uncertainties (Rg, Rg') (E > 0.0055 MeV) 15% (0.68 eV < E < 0.0055 MeV) 25% (E < 0.68 eV) 50% Short Range Correlation () (E > 0.0055 MeV) 0.9 (0.68 eV < E < 0.0055 MeV) 0.5 (E < 0.68 eV) 0.5 Exposure Rate Group Correlation Range () (E > 0.0055 MeV) 6 (0.68 eV < E < 0.0055 MeV) 3 (E < 0.68 eV) 2 WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-8 A.1.3 Comparisons of Measurements and Calculations Results of the least-squares evaluations are provided in Table A-7 through Table A-12. In these tables, measured, calculated, and best-estimate values for sensor reaction rates are given. Also provided in these tabulations are ratios of the measured reaction rates to both the calculated and least-squares adjusted reaction rates. These ratios of measured-to-calculated (M/C) and measured-to-best estimate (M/BE) illustrate the consistency of the fit of the calculated neutron energy spectra to the measured reaction rates both before and after adjustment. Additionally, comparisons of the calculated and best-estimate values of neutron fluence rate (E > 1.0 MeV) and iron atom displacement rate are tabulated along with the best estimate-to-calculated (BE/C) ratios observed for each of the capsules. The data comparisons provided in Table A-7 through Table A-12 show that the adjustments to the calculated spectra are relatively small and within the assigned uncertainties for the calculated spectra, measured sensor reaction rates, and dosimetry reaction cross-sections. Further, these results indicate that the use of the least-squares evaluation results in a reduction in the uncertainties associated with the exposure of the surveillance capsules. From Section 6.4, the calculational uncertainty is specified as 13% at the 1 level. Further comparisons of the measurement results with calculations are given in Table A-11 and Table A-12. In Table A-11, calculations of individual threshold sensor reaction rates are compared directly with the corresponding measurements. These threshold reaction rate comparisons provide a good evaluation of the accuracy of the fast neutron portion of the calculated energy spectra. In Table A-12, calculations of fast neutron exposure rates in terms of fast neutron (E > 1.0 MeV) fluence rate and dpa/s are compared with the best-estimate results obtained from the least-squares evaluation of the capsule dosimetry results. These comparisons yield consistent and similar results with all measurement-to-calculation comparisons falling within the 20% limits specified as the acceptance criteria in Regulatory Guide 1.190. In the case of the direct comparison of the measured and calculated sensor reaction rates, for the individual threshold foils considered in the least-squares analysis, the M/C comparisons of the fast neutron threshold reactions range from 0.95 to 1.09. The overall average M/C ratio is 1.05 with an associated standard deviation of 10%. In the case of the comparison of the best-estimate and calculated fast neutron exposure parameters, the BE/C comparisons are 1.03 and 1.02 for fast neutron (E > 1.0 MeV) fluence rate and iron atom displacement rate, respectively. Based on these comparisons, it is concluded that the calculated fast neutron exposures provided in Section 6.2 are valid for use in the assessment of the condition of the materials comprising the beltline region of the Seabrook Unit 1 reactor pressure vessel. WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 A-9 Table A-1 Nuclear Parameters Used in the Evaluation of Neutron Sensors 90% Atomic Target Product Fission Reaction of Response Weight Atom Half-life Yield Interest Range(1) (g/g-atom) Fraction (days) (%) (MeV) Cu-63 (n,) Co-60 63.546 0.6917 1925.28 - 4.53-11.0 Fe-54 (n,p) Mn-54 55.845 0.05845 312.13 - 2.27-7.54 Ni-58 (n,p) Co-58 58.693 0.68077 70.86 - 1.98-7.51 Co-59 (n,) Co-60 58.933 0.0015 1925.28 - Non-threshold U-238 (n,f) Cs-137 238.051 1.00 10975.76 0.0602 1.44-6.69 Np-237 (n,f) Cs-137 237.048 1.00 10975.76 0.0627 0.68-5.61 Note:

1. Energies between which 90% of activity is produced (U-235 fission spectrum) [A-6]

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Westinghouse Non-Proprietary Class 3 A-10 Table A-2 Monthly Thermal Generation at Seabrook Unit 1 Cycles 11 through 20 Cycle 11 Cycle 12 Cycle 13 Cycle 14 Thermal Thermal Thermal Thermal Generation Generation Generation Generation Month [MW-Hr] Month [MW-Hr] Month [MW-Hr] Month [MW-Hr] May-05 2583578 Oct-06 2380612 Apr-08 2469441 Oct-09 0 Jun-05 2583578 Nov-06 2380612 May-08 2469441 Nov-09 1086111 Jul-05 2583578 Dec-06 2380612 Jun-08 2469441 Dec-09 1037999 Aug-05 2583578 Jan-07 2380612 Jul-08 2469441 Jan-10 2712443 Sep-05 2583578 Feb-07 2380612 Aug-08 2469441 Feb-10 2450807 Oct-05 2583578 Mar-07 2380612 Sep-08 2469441 Mar-10 2712879 Nov-05 2583578 Apr-07 2380612 Oct-08 2469441 Apr-10 2625539 Dec-05 2583578 May-07 2380612 Nov-08 2469441 May-10 2712911 Jan-06 2583578 Jun-07 2380612 Dec-08 2469441 Jun-10 2625516 Feb-06 2583578 Jul-07 2380612 Jan-09 2469441 Jul-10 2712942 Mar-06 2583578 Aug-07 2380612 Feb-09 2469441 Aug-10 2712611 Apr-06 2583578 Sep-07 2380612 Mar-09 2469441 Sep-10 2618123 May-06 2583578 Oct-07 2380612 Apr-09 2469441 Oct-10 2709117 Jun-06 2583578 Nov-07 2380612 May-09 2469441 Nov-10 2608166 Jul-06 2583578 Dec-07 2380612 Jun-09 2469441 Dec-10 2712056 Aug-06 2583578 Jan-08 2380612 Jul-09 2469441 Jan-11 2713133 Sep-06 2583578 Feb-08 2380612 Aug-09 2469441 Feb-11 2389347 Mar-08 2380612 Sep-09 2469441 Mar-11 2704649 Cycle 15 Cycle 16 Cycle 17 Cycle 18 Thermal Thermal Thermal Thermal Generation Generation Generation Generation Month [MW-Hr] Month [MW-Hr] Month [MW-Hr] Month [MW-Hr] Apr-11 0 Oct-12 62480 Apr-14 445683 Nov-15 1374196 May-11 650030 Nov-12 2594864 May-14 2713588 Dec-15 2712722 Jun-11 2538387 Dec-12 2679986 Jun-14 2625844 Jan-16 2574335 Jul-11 2713353 Jan-13 2712617 Jul-14 2713066 Feb-16 2538280 Aug-11 2713110 Feb-13 2449444 Aug-14 2712632 Mar-16 2264705 Sep-11 2624424 Mar-13 2713070 Sep-14 2625692 Apr-16 2625495 Oct-11 702968 Apr-13 2625050 Oct-14 2712383 May-16 2712765 Nov-11 2625220 May-13 2712920 Nov-14 2625572 Jun-16 2624644 Dec-11 2193394 Jun-13 2624074 Dec-14 2712972 Jul-16 2713064 Jan-12 2048314 Jul-13 2713212 Jan-15 2712218 Aug-16 2712990 Feb-12 2159934 Aug-13 2712963 Feb-15 2450492 Sep-16 2624843 Mar-12 2298944 Sep-13 2623612 Mar-15 2712998 Oct-16 2712869 Apr-12 2070582 Oct-13 2712949 Apr-15 2625460 Nov-16 2625481 May-12 2303934 Nov-13 2625517 May-15 2712950 Dec-16 2712394 Jun-12 2228617 Dec-13 2712983 Jun-15 2624259 Jan-17 2713018 Jul-12 2292403 Jan-14 2711698 Jul-15 2712949 Feb-17 2450377 Aug-12 2301451 Feb-14 2450334 Aug-15 2712892 Mar-17 2661894 Sep-12 1027981 Mar-14 2704851 Sep-15 2434496 Oct-15 690 WCAP-18607-NP March 2021 Revision 0

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Westinghouse Non-Proprietary Class 3 A-11 Table A-2 Monthly Thermal Generation at Seabrook Unit 1 Cycles 11 through 20 (cont.) Cycle 19 Cycle 20 Thermal Thermal Generation Generation Month [MW-Hr] Month [MW-Hr] Apr-17 508 Oct-18 199331 May-17 2562737 Nov-18 2625256 Jun-17 2624660 Dec-18 2713451 Jul-17 2713179 Jan-19 2713377 Aug-17 2713084 Feb-19 2449809 Sep-17 2624858 Mar-19 2713095 Oct-17 2712960 Apr-19 2625501 Nov-17 2625531 May-19 2712470 Dec-17 2712441 Jun-19 2625374 Jan-18 2712952 Jul-19 2713018 Feb-18 2450372 Aug-19 2712948 Mar-18 2712937 Sep-19 2625544 Apr-18 2625383 Oct-19 2712257 May-18 2712985 Nov-19 2588534 Jun-18 2625380 Dec-19 2712928 Jul-18 2712895 Jan-20 2712883 Aug-18 2712074 Feb-20 2537818 Sep-18 2582280 Mar-20 2833086 WCAP-18607-NP March 2021 Revision 0

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Westinghouse Non-Proprietary Class 3 A-12 Table A-3 Measured Sensor Activities and Reaction Rates for Surveillance Capsule U Corrected Average Measured Saturated Reaction Average Reaction Sensor Location Activity Activity Rate Reaction Rate (dps/g) (dps/g) (rps/atom) Rate (rps/atom) (rps/atom) Cu Top 5.154E+04 4.605E+05 7.025E-17 Cu Middle 4.673E+04 4.175E+05 6.369E-17 6.552E-17 6.552E-17 Cu Bottom 4.595E+04 4.105E+05 6.263E-17 Iron Top 2.132E+06 4.311E+06 6.839E-15 Iron Middle 1.919E+06 3.880E+06 6.156E-15 6.328E-15 6.328E-15 Iron Bottom 1.867E+06 3.775E+06 5.989E-15 Ni Top 5.387E+07 6.457E+07 9.244E-15 Ni Middle 4.969E+07 5.956E+07 8.527E-15 8.713E-15 8.713E-15 Ni Bottom 4.877E+07 5.846E+07 8.369E-15 U-238 (Cd) Middle 1.253E+05 6.026E+06 3.957E-14 3.957E-14 3.333E-14 Np-237 (Cd) Middle 9.949E+05 4.785E+07 3.004E-13 3.004E-13 2.974E-13 Bare Co Top 1.055E+07 9.426E+07 6.150E-12 Bare Co Middle 1.101E+07 9.837E+07 6.418E-12 6.488E-12 6.488E-12 Bare Co Bottom 1.183E+07 1.057E+08 6.896E-12 Co (Cd) Top 5.654E+06 5.052E+07 3.296E-12 Co (Cd) Middle 5.465E+06 4.883E+07 3.186E-12 3.314E-12 3.314E-12 Co (Cd) Bottom 5.935E+06 5.303E+07 3.460E-12 Note(s):

1. Measured activity is decay corrected to July 25, 1991.
2. The average U-238 (n,f) reaction rate of 3.333E-14 rps/atom includes a correction factor of 0.872 to account for U-235 impurities and plutonium build-in, and an additional factor of 0.966 to account for photo-fission effects in the sensor.
3. The average Np-237 (n,f) reaction rate of 2.974E-13 rps/atom includes a correction factor of 0.990 to account for photo-fission effects in the sensor.
4. Measured reaction rates adjusted to the Cycle 1 rated reactor power level of 3411 MWt.

WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-13 Table A-4 Measured Sensor Activities and Reaction Rates for Surveillance Capsule Y Corrected Average Measured Saturated Reaction Average Reaction Sensor Location Activity Activity Rate Reaction Rate (dps/g) (dps/g) (rps/atom) Rate (rps/atom) (rps/atom) Cu Top 2.377E+05 5.061E+05 5.341E-17 Cu Middle 2.036E+05 4.335E+05 4.575E-17 4.882E-17 4.882E-17 Cu Bottom 2.105E+05 4.482E+05 4.730E-17 Iron Top 4.314E+07 5.653E+07 5.242E-15 Iron Middle 3.867E+07 5.067E+07 4.699E-15 4.857E-15 4.857E-15 Iron Bottom 3.811E+07 4.994E+07 4.631E-15 Ni Top 6.571E+07 8.121E+07 7.915E-15 Ni Middle 5.887E+07 7.276E+07 7.091E-15 7.327E-15 7.327E-15 Ni Bottom 5.791E+07 7.157E+07 6.975E-15 U-238 (Cd) Middle 3.907E+05 3.304E+06 2.170E-14 2.170E-14 1.749E-14 Np-237 (Cd) Middle 3.678E+06 3.111E+07 1.953E-13 1.953E-13 1.933E-13 Bare Co Top 1.770E+10 3.769E+10 3.688E-12 Bare Co Middle 1.812E+10 3.858E+10 3.776E-12 3.687E-12 3.687E-12 Bare Co Bottom 1.726E+10 3.675E+10 3.597E-12 Co (Cd) Top 8.266E+08 1.760E+09 1.722E-13 Co (Cd) Middle 8.447E+08 1.799E+09 1.760E-13 1.791E-13 1.791E-13 Co (Cd) Bottom 9.069E+08 1.931E+09 1.890E-13 Note(s):

1. Measured activity is decay corrected to May 10, 1997.
2. The average U-238 (n,f) reaction rate of 1.749E-14 rps/atom includes a correction factor of 0.833 to account for U-235 impurities and plutonium build-in, and an additional factor of 0.967 to account for photo-fission effects in the sensor.
3. The average Np-237 (n,f) reaction rate of 1.933E-13 rps/atom includes a correction factor of 0.990 to account for photo-fission effects in the sensor.
4. Measured reaction rates adjusted to the Cycles 1 through 5 rated reactor power level of 3411 MWt.

WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-14 Table A-5 Measured Sensor Activities and Reaction Rates for Surveillance Capsule V Corrected Average Measured Saturated Reaction Average Reaction Sensor Location Activity Activity Rate Reaction Rate (dps/g) (dps/g) (rps/atom) Rate (rps/atom) (rps/atom) Cu Top 1.98E+05 2.952E+05 4.504E-17 Cu Middle 1.74E+05 2.595E+05 3.958E-17 4.132E-17 4.132E-17 Cu Bottom 1.73E+05 2.580E+05 3.935E-17 Fe Top 1.79E+06 2.962E+06 4.699E-15 Fe Middle 1.61E+06 2.664E+06 4.226E-15 4.366E-15 4.366E-15 Fe Bottom 1.59E+06 2.631E+06 4.174E-15 Ni Top 7.40E+06 4.577E+07 6.552E-15 Ni Middle 6.77E+06 4.187E+07 5.994E-15 6.145E-15 6.145E-15 Ni Bottom 6.65E+06 4.113E+07 5.888E-15 U-238 (Cd) Middle 1.13E+06 4.732E+06 3.107E-14 3.107E-14 2.366E-14 Np-237 (Cd) Middle 8.08E+06 3.383E+07 2.124E-13 2.124E-13 2.103E-13 Bare Co Top 3.41E+07 5.085E+07 3.317E-12 Bare Co Middle 3.43E+07 5.115E+07 3.337E-12 3.327E-12 3.327E-12 Bare Co Bottom 3.42E+07 5.100E+07 3.327E-12 Co (Cd) Top 1.77E+07 2.639E+07 1.722E-12 Co (Cd) Middle 1.85E+07 2.759E+07 1.800E-12 1.780E-12 1.780E-12 Co (Cd) Bottom 1.87E+07 2.788E+07 1.819E-12 Note(s):

1. Measured activity is decay corrected to September 24, 2005.
2. The average U-238 (n,f) reaction rate of 2.366E-14 rps/atom includes a correction factor of 0.788 to account for U-235 impurities and plutonium build-in, and an additional factor of 0.967 to account for photo-fission effects in the sensor.
3. The average Np-237 (n,f) reaction rate of 2.103E-12 rps/atom includes a correction factor of 0.990 to account for photo-fission effects in the sensor.
4. Measured reaction rates adjusted to the Cycles 1 through 10 rated reactor power level of 3411 MWt.

WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-15 Table A-6 Measured Sensor Activities and Reaction Rates for Surveillance Capsule X Corrected Average Measured Saturated Reaction Average Reaction Sensor Location Activity Activity Rate Reaction Rate (dps/g) (dps/g) (rps/atom) Rate (rps/atom) (rps/atom) Cu Top 1.94E+05 2.267E+05 3.458E-17 Cu Middle 1.92E+05 2.244E+05 3.423E-17 3.601E-17 3.601E-17 Cu Bottom 2.20E+05 2.571E+05 3.922E-17 Fe Top 1.85E+06 2.728E+06 4.328E-15 4.554E-15 4.554E-15 Fe Bottom 1.92E+06 2.831E+06 4.492E-15 Ni Top 2.07E+06 3.052E+06 4.843E-15 Ni Middle 8.23E+06 4.158E+07 5.953E-15 6.172E-15 6.172E-15 Ni Bottom 8.28E+06 4.183E+07 5.989E-15 U-238 (Cd) Middle 9.09E+06 4.592E+07 6.575E-15 4.205E-14 2.773E-14 Np-237 (Cd) Middle 2.85E+06 6.404E+06 4.205E-14 2.356E-13 2.332E-13 Bare Co Top 1.67E+07 3.753E+07 2.356E-13 Bare Co Middle 4.13E+07 4.826E+07 3.149E-12 3.334E-12 3.334E-12 Bare Co Bottom 4.63E+07 5.410E+07 3.530E-12 Co (Cd) Top 4.36E+07 5.095E+07 3.324E-12 Co (Cd) Middle 2.54E+07 2.968E+07 1.936E-12 1.591E-12 1.591E-12 Co (Cd) Bottom 2.51E+07 2.933E+07 1.914E-12 Note(s):

1. Measured activity is decay corrected to September 15, 2020.
2. 2.The average U-238 (n,f) reaction rate of 2.773E-14 rps/atom includes a correction factor of 0.683 to account for U-235 impurities and plutonium build-in, and an additional factor of 0.966 to account for photo-fission effects in the sensor.
3. The average Np-237 (n,f) reaction rate of 2.332E-13 rps/atom includes a correction factor of 0.990 to account for photo-fission effects in the sensor.
4. Measured reaction rates adjusted to the Cycles 1 through 20 average rated reactor power level of 3534 MWt.

WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-16 Table A-7 Least-Squares Evaluation of Dosimetry in Surveillance Capsule U (Dual 31.5° Position, Core Midplane, Irradiated During Cycle 1) 2/DOF = 0.1740 Reaction Rate (rps/atom) Best- M/C M/BE BE/C Measured Calculated Reaction Estimate (M) (C) (BE) 63 Cu (n,) 60Co 6.55E-17 5.54E-17 6.27E-17 1.18 0.96 1.13 54 Fe (n,p) 54Mn 6.33E-15 6.29E-15 6.42E-15 1.01 1.02 1.02 58 58 Ni (n,p) Co 8.71E-15 8.84E-15 8.90E-15 0.99 1.02 1.01 238 137 U(Cd) (n,f) Cs 3.33E-14 3.42E-14 3.32E-14 0.98 1.00 0.97 237 137 Np(Cd) (n,f) Cs 2.97E-13 3.35E-13 3.07E-13 0.89 1.03 0.91 59 60 Co (n,) Co 6.49E-12 5.62E-12 6.43E-12 1.15 0.99 1.14 59 60 Co(Cd) (n,) Co 3.31E-12 3.49E-12 3.34E-12 0.95 1.01 0.96 Average of Fast Energy Threshold Reactions 1.01 1.01 1.01 Percent Standard Deviation 10.5 2.8 8.0 Best-Calculated Integral Quantity  % Unc. Estimate  % Unc. BE/C (C) (BE) Neutron Fluence Rate (E > 1.0 MeV) 1.08E+11 13 1.03E+11 6 0.95 (n/cm2-s) Displacement Rate 2.09E-10 13 1.99E-10 8 0.95 (dpa/s) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-17 Table A-8 Least-Squares Evaluation of Dosimetry in Surveillance Capsule Y (Dual 29° Position, Core Midplane, Irradiated During Cycles 1 through 5) 2/DOF = 0.3572 Reaction Rate (rps/atom) Best- M/C M/BE BE/C Measured Calculated Reaction Estimate (M) (C) (BE) 63 Cu (n,) 60Co 4.88E-17 4.02E-17 4.80E-17 1.21 0.98 1.19 54 Fe (n,p) 54Mn 4.86E-15 4.40E-15 4.98E-15 1.10 1.02 1.13 58 58 Ni (n,p) Co 7.33E-15 6.17E-15 7.06E-15 1.19 0.96 1.14 237 137 Np(Cd) (n,f) Cs 1.93E-13 2.28E-13 2.13E-13 0.85 1.10 0.93 59 60 Co (n,) Co 3.69E-12 3.73E-12 3.69E-12 0.99 1.00 0.99 Average of Fast Energy Threshold Reactions 1.09 1.02 1.10 Percent Standard Deviation 15.2 6.1 10.5 Best-Calculated Estimate Integral Quantity (C)  % Unc. (BE)  % Unc. BE/C Neutron Fluence Rate (E > 1.0 MeV) 7.41E+10 13 7.77E+10 7 1.05 (n/cm2-s) Displacement Rate 1.42E-10 13 1.45E-10 8 1.02 (dpa/s) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-18 Table A-9 Least-Squares Evaluation of Dosimetry in Surveillance Capsule V (Dual 29° Position, Core Midplane, Irradiated During Cycles 1 through 10) 2/DOF = 0.0271 Reaction Rate (rps/atom) Best-Measured Calculated Estimate Reaction (M) (C) (BE) M/C M/BE BE/C 63 Cu (n,) 60Co 4.13E-17 3.78E-17 4.10E-17 1.09 0.99 1.08 54 Fe (n,p) 54Mn 4.37E-15 4.10E-15 4.39E-15 1.07 1.00 1.07 58 58 Ni (n,p) Co 6.14E-15 5.73E-15 6.14E-15 1.07 1.00 1.07 238 137 U(Cd) (n,f) Cs 2.37E-14 2.17E-14 2.30E-14 1.09 0.97 1.06 237 137 Np(Cd) (n,f) Cs 2.10E-13 2.10E-13 2.14E-13 1.00 1.02 1.02 59 60 Co (n,) Co 3.33E-12 3.42E-12 3.31E-12 0.97 1.00 0.97 59 60 Co(Cd) (n,) Co 1.78E-12 2.14E-12 1.80E-12 0.83 1.01 0.84 Average of Fast Energy Threshold Reactions 1.06 1.00 1.06 Percent Standard Deviation 3.5 1.8 2.2 Best-Calculated Estimate Integral Quantity (C)  % Unc. (BE)  % Unc. BE/C Neutron Fluence Rate (E > 1.0 MeV) 6.83E+10 13 7.18E+10 6 1.05 (n/cm2-s) Displacement Rate 1.31E-10 13 1.36E-10 7 1.04 (dpa/s) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-19 Table A-10 Least-Squares Evaluation of Dosimetry in Surveillance Capsule X (Dual 31.5° Position, Core Midplane, Irradiated During Cycles 1 through 20) 2/DOF = 0.3369 Reaction Rate (rps/atom) Best- M/C M/BE BE/C Measured Calculated Reaction Estimate (M) (C) (BE) 63 Cu (n,) 60Co 3.60E-17 4.03E-17 3.73E-17 0.89 1.04 0.93 54 Fe (n,p) 54Mn 4.55E-15 4.37E-15 4.46E-15 1.04 0.98 1.02 58 58 Ni (n,p) Co 6.17E-15 6.11E-15 6.23E-15 1.01 1.01 1.02 238 137 U(Cd) (n,f) Cs 2.77E-14 2.31E-14 2.47E-14 1.20 0.89 1.07 237 137 Np(Cd) (n,f) Cs 2.33E-13 2.22E-13 2.36E-13 1.05 1.01 1.06 59 60 Co (n,) Co 3.33E-12 3.65E-12 3.31E-12 0.91 0.99 0.91 59 60 Co(Cd) (n,) Co 1.59E-12 2.27E-12 1.62E-12 0.70 1.02 0.71 Average of Fast Energy Threshold Reactions 1.04 0.99 1.02 Percent Standard Deviation 10.7 5.9 5.4 Best-Calculated Estimate Integral Quantity (C)  % Unc. (BE)  % Unc. BE/C Neutron Fluence Rate (E > 1.0 MeV) 7.25E+10 13 7.86E+10 6 1.08 (n/cm2-s) Displacement Rate 1.39E-10 13 1.48E-10 7 1.06 (dpa/s) WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-20 Table A-11 Measured-to-Calculated (M/C) Reaction Rates - In-Vessel Capsules Capsule  % Std. Reaction Average U Y V X Dev. 63 Cu (n,) 60Co 1.18 1.21 1.09 0.89 1.09 13.2 54 Fe (n,p) 54Mn 1.01 1.10 1.07 1.04 1.06 3.7 58 Ni (n,p) 58Co 0.99 1.19 1.07 1.01 1.07 8.5 238 U(Cd) (n,f) 137Cs 0.98 -- 1.09 1.20 1.09 10.1 237 Np(Cd) (n,f) 137Cs 0.89 0.85 1.00 1.05 0.95 9.8 Average of M/C Results 1.05 10 Table A-12 Best-Estimate-to-Calculated (BE/C) Exposure Rates - In-Vessel Capsules Neutron Fluence Rate Iron Atom Displacement Rate Capsule (E > 1.0 MeV) BE/C BE/C U 0.95 0.95 Y 1.05 1.02 V 1.05 1.04 X 1.08 1.06 Average 1.03 1.02 Percent Standard Deviation 5.7 4.6 WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 A-21 REFERENCES A-1 U.S. Nuclear Regulatory Commission Regulatory Guide 1.190, Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence, March 2001. A-2 Westinghouse Report WCAP-16526-NP, Rev. 0, Analysis of Capsule V from FPL Energy - Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program, March 2006. A-3 A. Schmittroth, FERRET Data Analysis Core, HEDL-TME 79-40, Hanford Engineering Development Laboratory, Richland, WA, September 1979. A-4 RSICC Data Library Collection DLC-178, SNLRML Recommended Dosimetry Cross-Section Compendium, July 1994. A-5 ASTM Standard E944-19, Standard Guide for Application of Neutron Spectrum Adjustment Methods in Reactor Surveillance, 2019. A-6 ASTM Standard E844-18, Standard Guide for Sensor Set Design and Irradiation for Reactor Surveillance, 2018. WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-1 APPENDIX B LOAD-TIME RECORDS FOR CHARPY SPECIMEN TESTS FROM CAPSULE X KLXX denotes Lower Shell Plate R1808-3, longitudinal orientation KTXX denotes Lower Shell Plate R1808-3, transverse orientation KWXX denotes weld material KHXX denotes heat-affected zone material Note that the instrumented Charpy data is not required per ASTM Standards E185-82 or E23-18. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-2 KL50: Tested at 30°F KL51: Tested at 40°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-3 KL60: Tested at 50°F KL53: Tested at 60°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-4 KL56: Tested at 60°F KL57: Tested at 78°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-5 KL49: Tested at 90°F KL58: Tested at 100°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-6 KL52: Tested at 110°F KL59: Tested at 130°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-7 KL47: Tested at 140°F KL55: Tested at 160°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-8 KL54: Tested at 180°F KL46: Tested at 200°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-9 KL48: Tested at 220°F KT52: Tested at 50°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-10 KT59: Tested at 78°F KT47: Tested at 90°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-11 KT54: Tested at 100°F KT56: Tested at 110°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-12 KT50: Tested at 120°F KT53: Tested at 130°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-13 KT46: Tested at 140°F KT49: Tested at 150°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-14 KT58: Tested at 160°F KT60: Tested at 170°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-15 KT48: Tested at 180°F KT57: Tested at 190°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-16 KT55: Tested at 200°F KT51: Tested at 220°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-17 KW56: Tested at -50°F KW46: Tested at -30°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-18 KW60: Tested at -25°F KW55: Tested at -20°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-19 KW50: Tested at -15°F KW48: Tested at -10°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-20 KW52: Tested at -5°F KW54: Tested at 0°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-21 KW53: Tested at 15°F KW47: Tested at 25°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-22 KW58: Tested at 40°F KW59: Tested at 60°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-23 KW49: Tested at 90°F KW51: Tested at 100°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-24 KW57: Tested at 130°F KH60: Tested at -50°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-25 KH47: Tested at -30°F KH51: Tested at -25°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-26 KH55: Tested at -20°F KH52: Tested at -15°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-27 KH49: Tested at -10°F KH56: Tested at -5°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-28 KH50: Tested at 0°F KH54: Tested at 15°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-29 KH53: Tested at 25°F KH57: Tested at 40°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-30 KH48: Tested at 60°F KH59: Tested at 90°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 B-31 KH58: Tested at 100°F KH46: Tested at 130°F WCAP-18607-NP March 2021 Revision 0

      • This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-1 APPENDIX C CHARPY V-NOTCH PLOTS FOR EACH CAPSULE INCLUDING BASELINE DATA USING SYMMETRIC HYPERBOLIC TANGENT CURVE-FITTING METHOD METHODOLOGY Contained in Table C-1 are the upper-shelf energy (USE) values that are used as input for the generation of the Charpy V-notch plots using CVGRAPH, Version 6.02. The definition for USE is given in ASTM E185-82 [C-1], Section 4.18, and reads as follows: upper shelf energy level - the average energy value for all Charpy specimens (normally three) whose test temperature is above the upper end of the transition region. For specimens tested in sets of three at each test temperature, the set having the highest average may be regarded as defining the upper shelf energy. Westinghouse reports the average of all Charpy data ( 95% shear) as the USE, excluding any values that are deemed outliers using engineering judgment. Hence, the Capsule X USE values reported in Table C-1 were determined by applying this methodology to the Charpy data tabulated in Table 5-1 through Table 5-4 of this report. USE values documented in Table C-1 for the unirradiated material, as well as for Capsule U, Capsule V, and Capsule Y were also determined by applying the methodology described above to the Charpy impact data reported in WCAP-10110 [C-2] and WCAP-16526-NP [C-3]. The USE values reported in Table C-1 were used in the generation of the Charpy V-notch curves. The lower-shelf energy values were fixed at 2.2 ft-lb for all cases. The lower-shelf lateral expansion values were fixed at 1.0 mil in order to be consistent with the previous capsule analysis. Similarly, the upper-shelf energy must also be fixed for curve-fitting the Charpy V-Notch (CVN) Energy data using the values reported in Table C-1. However, the upper-shelf lateral expansion is not fixed in CVGRAPH. The only exceptions to this in the following graphs are for the Capsule X HAZ material and Capsule X transverse plate material, which did have the upper-shelf lateral expansion set to fixed values, because the CVGRAPH software produced artificially high upper-shelf lateral expansion values without setting the value. The fixed lateral expansion values were based on an average of all the lateral expansion values corresponding to greater than or equal to 95% shear. WCAP-18607-NP March 2021 Revision 0 

     *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-2 Table C-1 Upper-Shelf Energy Values (ft-lb) Fixed in CVGRAPH(1) Unirradiated Capsule U Capsule Y Capsule V Capsule X Material (ft-lb) (ft-lb) (ft-lb) (ft-lb) (ft-lb) Lower Shell Plate R1808-3, Heat # D1136-2 125 118 107 112 115 (Longitudinal) Lower Shell Plate R1808-3, Heat # D1136-2 79 73 66 69 70 (Transverse) Weld Metal 160 144 144 156 124(2) Heat # 4P6052 HAZ 130 134 114 130 118 Notes:

1. These values are calculated as an average of all in-family data points with a shear 95%, unless noted otherwise. Unirradiated and previous capsule USE values are consistent with the previous capsule analysis in WCAP-16526-NP [C-3].
2. No specimens exhibited 95% or greater shear. Thus, this value is based upon the average of 3 specimens at 85% shear. This approach is conservative, as the actual USE is expected to be greater than 124 ft-lb if greater than 95% shear was obtained.

CVGRAPH, Version 6.02 plots of all surveillance data are provided in this appendix, on the pages following the reference list. REFERENCES C-1 ASTM E185-82, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels, American Society for Testing and Materials, 1982. C-2 Westinghouse Report WCAP-10110, Rev. 0, Public Service Company of New Hampshire Seabrook Station Unit No. 1 Reaactor Vessel Radiation Surveillance Program, March 1983. C-3 Westinghouse Report WCAP-16526-NP, Rev. 0, Analysis of Capsule V from FPL Energy - Seabrook Unit 1 Reactor Vessel Radiation Surveillance Program, March 2006. WCAP-18607-NP March 2021 Revision 0 

      *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-3 CVGRAPH VERSION 6.02 INDIVIDUAL PLOTS WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-2 Unirradiated Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6.02: Hyperbolic Ta ngent Curve Printed on 11 /3/2020 5: 17 PM A = 63.60 B = 61..tO C = 62.35 TO = 10.17 D = 0.00 Correlation Coe1licielll = 0.981 Equation is A+ B * [Tanh((T-TO)/(C+DT))j Upper Shelf Energy = 125.00 (Fixed) Lower Shelf E nergy = 2.20 (Fixed) Temp@30 ft-lbs=-28. l 0° F TcmPt@35 ft-lbs=-2 1.20° F Tcmpl'lil -o ft-lbs= -3.80° F P lan!: Seabrook 1 Material: SA533Bl Heal: Dl136-2 Orientation: LT Capsule: Uoirrad 

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               -300           -200           -100              0           100            200          300           400             500         600 Temperature {° F)

CVGraph 6.02 11/03/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-3 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -60                         10.0                        13.9                       -3.90
                   -60                         12.0                        13.9                       -1.90
                   -30                         18.0                        28.7                     -1 0.74
                   -30                         260                         28.7                       -2.74
                   -30                         38.0                        28.7                        9.26 0                         49.0                        53.7                       -4.68 0                         50.0                        53.7                       -3.68 0                         70.0                        53.7                      16.32 40                         85.0                        90.9                       -5.93 40                         970                         90.9                        6.07 75                         90.0                       111.4                     -21.36 75                       124.0                        111.4                      12.64 11 0                        117.0                       120.2                       -3.20 110                        1260                         120.2                        5.80 200                        123.0                        124.7                       -1.72 200                         127.0                       124.7                        2.28 200                         127.0                       124.7                        2.28 300                        124.0                        125.0                       -0.99 CVGraph 6.02                                          11/03/2020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-4 Capsule U Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 12/8/20205: 17 PM A= 60.10 B = 57.90 C = 55.93 TO = 43.81 D = 0.00 Correlation Coefficient = 0.962 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 118.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 fl -lbs= 11.60° F Temp@35 ft-lbs= 17.90° F Temp(iV_,50 fl-lbs= 34.00° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: U 140 120 0 0 

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              -300         -200         -100           0            100          200          300          400            500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-5 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: U Capsule U Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -40                         110                           7.7                       3.29 0                         28.0                        22.2                        5.80 20                         34.0                        36.8                       -2.84 40                         62.0                        56.2                        5.83 40                         52.5                        56.2                       -3.67 70                        102.5                        854                       17. 11 70                         60.0                        854                      -25.39 90                         88.0                        994                      -11.37 100                        117.5                        104.3                      13.19 125                        122.0                        11 2.0                     10.02 125                        120.0                        11 2.0                       8.02 150                         117.0                       115.5                        1.54 225                         112.5                       117.8                       -5.32 325                         11 2.0                      118.0                       -6.00 550                         121 5                       118.0                        3.50 CVGraph 6.02                                          12/08/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-6 Capsule Y Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11 /3/2020 5:32 PM A= 54.60 B = 52.40 C = 63.25 TO = 51.25 D = 0.00 Correlation Coefficient = 0.979 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 107.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 fl -lbs= 19.10° F Temp@35 ft-lbs= 26.40° F Temp(iV_,50 fl-lbs= 45.70° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: LT Capsule: Y 120 100 0 

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              -300        -200         -100           0            100          200          300          400            500         600 Temperature(° F)

CVGraph 6.02 11/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-7 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -40                          8.5                         7.7                        0.76 0                         18.5                        19.5                       -1.00 25                         42.0                        34.0                        7.98 50                         55.0                        53.6                        1.44 68                         73.5                        68.2                        5.34 71                         50.0                        70.4                     -20.45 100                          920                         88.5                        3.48 125                        103.0                         97.7                        5.28 150                        11 2.5                       102.6                        9.92 175                        107.0                        104.9                        2.05 200                         111.5                       106.1                        5.44 200                         110.5                       106.1                        4.44 250                         103.5                       106.8                       -330 300                        104.5                        1070                        -2.46 350                         102.0                       1070                        -4.99 CVGraph 6.02                                          1110312020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-8 Capsule V Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6.02: Hyperbolic Tangent Curve Printed on 12/9/2020 11 :42 AM A= 57.10 B = 54.90 C = 84.65 TO = 78.06 D = 0.00 Correlation Coefficient = 0.986 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 112.00 (Fixed) Lower Shelf Energy= 2.20 (Fixed)

Temp@30 fl -lbs= 32.30° F Temp@35 ft-lbs= 42.00° F Temp(iV_,50 fl-lbs= 67.10° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: V 140 120 

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              -300         -200        -100            0            100          200          300         400            500         600 Temperature(° F)

CVGraph 6.02 12/09/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-9 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: V Capsule V Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -50                          7.0                         7.3                       -0.28 0                         12.0                        17.2                       -5.19 25                         30.0                        26.6                        342 50                         48.0                        39.5                        846 50                         40.0                        39.5                        046 75                         41.0                        55.1                     -14.12 75                         65.0                        55.1                        9.88 100                          67.0                        710                        -4.02 125                          81.0                        84.8                       -3.77 150                          98.0                        95.0                        2.96 175                         102.0                       101.9                        0.09 225                         111.0                       108.7                        2.31 250                         123.0                       110.1                      12.86 300                         122.0                       1114                       10.58 350                         114.0                       111.8                        2.1 8 CVGraph 6.02                                          1210912020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-10 Capsule X Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6.02: Hyperbolic Tangent Curve Printed on 12/3/2020 4:37 PM A= 58.60 B = 56.40 C = 74.94 TO= 86.20 D = 0.00 Correlation Coefficient = 0.900 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 115.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 fl -lbs= 44.40° F Temp@35 ft-lbs= 52.80° F Temp(iV_,50 fl-lbs= 74.70° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: X 140 120 

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              -300        -200         -100           0            100          200          300          400            500         600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-11 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: X Capsule X Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input CVN Computed CVN Differential 78 61.0 52.5 8.54 100 41. 8 68.9 -27.12 50 32.0 33.3 -1.30 200 121.0 109.8 11.16 30 12.8 22.8 -10.03 60 69.5 39.7 29.85 11 0 71.5 75.9 -4.44 180 109.5 106.5 3.03 40 27.5 27.7 -0.16 90 78.5 61.5 17.04 220 114.0 111.9 2.09 60 19.0 39.7 -20.65 140 69.5 93.3 -23.82 160 107.5 1012 6.31 130 1060 88.3 17.74 CVGraph 6.02 12/03/2020 Page 2/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-12 Unirradiated Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6 .02: Hyperbolic Tangent Curve Printed on 11 /3/2020 5:2 1 PM A= 40.60 B = 39.60 C = 70.98 TO = 3. 76 D = 0.00 Correlation Coefficient = 0.983 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 80.20 L ower Shelf L.E. = 1.00 (Fixed)

Temp@3 5 mils= -6.30° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: LT Capsule: Uni rrad

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              -300      -200       -100            0            100          200           300          400 500        600 Temperature(° F)

CVGraph 6.02 11/03/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-13 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -60                        18.0                         12.3                        5.73
                   -60                        14.0                         12.3                        1.73
                   -30                        18.0                         23.1                       -5.07
                   -30                        18.0                         23.1                       -5.07
                   -30                        25.0                         23.1                        1.93 0                       35.0                         38.5                       -3.50 0                       35.0                         38.5                       -3.50 0                       48.0                         38.5                        9.50 40                        58.0                         59.2                       -1.23 40                        61.0                         59.2                        1.77 75                        63.0                         70.8                       -7.82 75                        79.0                         70. 8                       8.1 8 11 0                       720                          76.4                       -4.42 110                        80.0                         76.4                        3.58 200                         79.0                         79.9                       -0.89 200                         80.0                         79.9                        0.11 200                         84.0                         79.9                        4.11 300                         770                          80.2                       -3.1 8 CVGraph 6.02                                          1110312020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-14 Capsule U Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6 .02: Hyperbolic Tan ge nt Curve Printed on 11 /3/20 20 5:27 PM A= 42.09 B = 41.09 C = 63.34 TO = 35.58 D = 0.00 Correlation Coefficient = 0 .974 Equation is A + B

  • ITa nh((T-TO)/(C+DT)) I Upper Shelf L E.= 83.17 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 24.60° F Plant: Seabrnok 1 Mate rial: SA53381 Heat: D1136-2 Orientation : LT Capsule : U 

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              -300       -200        -100            0            100           200          300           400 500        600 Temperature(° F)

CVGraph 6.02 11/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-15 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: U Capsule U Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -40                         9.0                          7.9                        108 0                        25.0                         21.2                        3.84 20                        31.0                         32.2                       -118 40                        47.0                         44.9                        2.05 40                        42.0                         44.9                       -2.95 70                        710                          62.4                        8.55 70                        49.0                         62.4                     -13.45 90                        68.0                         70.7                       -2.68 100                        770                          73.7                        3.33 125                        85.0                         78.6                        6.43 125                        83.0                         78.6                        4.43 150                        84.0                         810                         2.99 225                         76.0                         83.0                       -6.97 325                         85.0                         83.2                        1 84 550                         780                          83.2                       -5.1 7 CVGraph 6.02                                          11/03/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-16 Capsule Y Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6 .02: Hyperbolic Tange nt Curve Printed on 11 /3/20 20 5:34 PM A= 39.35 B = 38.35 C = 63.27 TO = 49.07 D = 0.00 Correlation Coefficient = 0.989 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 77.71 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 41.90° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: Y

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              -300       -200       -100           0            100          200           300           400 500        600 Temperature(° F)

CVGraph 6.02 11/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-17 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -40                         2.0                          5.3                       -3.33 0                        130                          14.4                       -1.42 25                        30.0                         25.4                        4.57 50                        41.0                         39.9                        1 08 68                        55.0                         50.5                        4.50 71                        42.0                         52.1                     -10. 14 100                        65.0                         64.9                        0.07 125                        75.0                         71.3                        3.67 150                        760                          74.7                        1.32 175                        75.0                         76.3                       -1.30 200                         770                          771                        -0.07 200                         81.0                         77.1                        3.93 250                         75.0                         77.6                       -2.58 300                         no                           77.7                       -0.68 350                         760                          77.7                       -1.70 CVGraph 6.02                                          11/03/2020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-18 Capsule V Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6 .02: Hyperbolic Tange nt Curve Printed on 12/9/2020 11 :43 AM A= 39.85 B = 38.85 C = 90.62 TO = 73.36 D = 0.00 Correlation Coefficient = 0 .988 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 78.70 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 62.00° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: V 

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              -300       -200      -100           0           100           200           300          400 500        600 Temperature (° F)

CVGraph 6.02 12/09/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-19 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: V Capsule V Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -50                         6.0                          5.8                        0.21 0                        130                          13.8                       -0.85 25                        26.0                         20.9                        5.12 50                        35.0                         30.0                        4.95 50                        29.0                         30.0                       -105 75                        33.0                         40.6                       -7.55 75                        40.0                         40.6                       -0.55 100                        46.0                         51 0                       -4.95 125                        62.0                         59.9                        2.13 150                        730                          66.6                        6.39 175                        74.0                         71.2                        2.75 225                         720                          76.1                       -4.06 250                         80.0                         77.2                        2.84 300                         no                           78.2                       -118 350                         76.0                         78.5                       -2.53 CVGraph 6.02                                          1210912020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-20 Capsule X Lower Shell Plate R1808-3 (Longitudinal) CVGrnph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/20 20 4:38 PM A= 38.43 B = 37.43 C = 74.50 TO= 76. 78 D = 0.00 Correlation Coefficient = 0.898 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 75.86 Lower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 70.00° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: LT Capsule: X 

   ,-.. 60
  • rll
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  *-=r ll
     ~

Q. 40 

     ~
   ~
     ~     30 QJ
     ~
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20 ol::::::::::c:::::+/-:::::::I:=::::C::::........1...-...L---1.~L-....1...-...L---1.~L-...i...._...L---1..~L-...1...-~ 

              -300        -200        -100           0            100          200          300          400     500         600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-21 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: X Capsule X Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 78 42.0 39.0 2.96 100 31.0 49.7 -1 8.73 50 24.0 25.5 -1.53 200 75.0 73.2 1.78 30 130 17.6 -4.60 60 49.0 30.1 18.86 11 0 55.0 54.1 0.91 180 69.5 71.4 -1.95 40 220 21.3 0.68 90 53.0 45.0 8.00 220 73.0 74.3 -1.29 60 170 30.1 -13.14 140 52.0 64.3 -1 2.27 160 73.5 68.6 4.88 130 760 61.4 14.61 CVGraph 6.02 12/03/2020 Page 212 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-22 Unirradiated Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 11 /3/2020 5:20 PM A = 50.00 B = 50.00 C = 70.68 TO = 18.80 D = 0.00 Correlation Coefficient = 0 .985 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear = 18.90 Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: LT Capsule: Uni rrad 100 

                                                               -- I~ -
                 ~

90 

                 ~

I . r 80 ' 70  : l- 

    ~

QJ 60 

                 ~
                       .                                  ~                                                     .
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                 -                               1 20 10
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              -300        -200        -100           0           100           200          300         400       500        600 Temperature {° F)

CVGraph 6.02 11/03/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-23 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -60                         18.0                         9.7                        8.29
                   -60                         18.0                         9.7                        8.29
                   -30                         18.0                        201                        -2.09
                   -30                         25.0                        20.1                        4.91
                   -30                         18.0                        20 1                       -2.09 0                        34.0                        37.0                       -3 01 0                        30.0                        37.0                       -7 01 0                        40.0                        37.0                        2.99 40                         560                         64.6                       -8.56 40                         640                         64.6                       -0.56 75                         79.0                        83.1                       -4.07 75                        100.0                        83.1                       16.93 11 0                        91.0                        93.0                       -1.96 110                        1000                         93.0                        704 200                         1000                         99.4                        0.59 200                         100.0                        99.4                        0.59 200                         100.0                        99.4                        0.59 300                         1000                        1000                         0.03 CVGraph 6.02                                          1110312020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-24 Capsule U Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 11 /3/2020 5:26 PM A = 50.00 B = 50.00 C = 51.03 TO = 4 7.91 D = 0.00 Correlation Coefficient = 0 .967 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 48.00 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D 1136-2 O rientation: LT Capsule: U 100 -- -- -- -- 90 

                  -                                                   7 80 01                                               .

70

r
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QJ 60 

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                                                           ~

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20 . I 10 0 

                                            ~    -
               -300        -200        -100           0             100          200          300        400        500         600 Temperature {° F)

CVGraph 6.02 11/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-25 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: U Capsule U Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -40                          0.0                         3.1                       -3.09 0                         25.0                        13.3                       11.74 20                         25.0                        25.1                       -0.09 40                         50.0                        42.3                        7.69 40                         30.0                        42.3                     -12.31 70                         85.0                        70.4                       14.61 70                         50.0                        70.4                     -20.39 90                         80.0                        83.9                       -3.88 100                       1000                          88.5                       11.49 125                       1000                          95.4                        4.65 125                        100.0                        95.4                        4.65 150                        100.0                        98.2                        1.80 225                         100.0                        99.9                        0.10 325                         1000                        1000                         000 550                         1000                        1000                         0 00 CVGraph 6.02                                          11/03/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-26 Capsule Y Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6 .02: Hyperbolic Tangent Curve Printed o n 11 /3/2020 5:33 PM A = 50.00 B = 50.00 C = 5 7.07 TO= 55.13 D = 0.00 Correlation Coefficient = 0 .986 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 55.20 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D 1136-2 O rientation: LT Capsule: Y r 100 90 c/ ' 80 ' 70 _/

I
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QJ 60 

   ...c 00 50                                             ..J 10 QJ
    ~

l- 

                  -     '                                   j                                                     '

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                                                                                                                  ~

20 

                  -                                     7
                  -                                   I 10 0
                                          ~     -
               -300       -200        -100           0             100           200          300        400        500         600 Temperature {° F)

CVGraph 6.02 11/03/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-27 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -40                          0.0                         3.4                        -3.44 0                         10.0                        12.7                        -2.65 25                         30.0                        25.8                         4.19 50                         50.0                        45.5                         4.48 68                         70.0                        61.1                         8.91 71                         45.0                        63.6                      -1 8.56 100                         85.0                        82.8                         2.1 9 125                         95.0                        92.0                         2.95 150                       1000                          96.5                         347 175                       1000                          98.5                         148 200                         100.0                        99.4                         0.62 200                         100.0                        99.4                         0.62 250                         100.0                        99.9                         0.11 300                         1000                        1000                          0.02 350                         1000                        1000                          0 00 CVGraph 6.02                                          1110312020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-28 Capsule V Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6.02: Hyperbolic Tangent Curve Printed on 12/9/2020 11 :45 AM A = 50.00 B = 50.00 C = 54.84 TO= 95.14 D = 0.00 Correlation Coefficient = 0 .991 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 95.20 Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: LT Capsule: V 100 - ......---- -- 90 

                 -                                                     o/

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              -300       -200        -100          0           100           200          300        400        500        600 Temperature {° F)

CVGraph 6.02 12/09/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-29 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: V Capsule V Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -50                          5.0                         0.5                         4.50 0                         10.0                         3.0                         6.98 25                         15.0                         7.2                         7.81 50                         20.0                        16.2                         3.84 50                         20.0                        16.2                         3.84 75                         20.0                        32.4                      -1 2.42 75                         30.0                        32.4                        -2.42 100                         60.0                        54.4                         5.58 125                         70.0                        74. 8                       -4.82 150                         95.0                        88.1                         6.91 175                        100.0                        94.8                         5.1 5 225                         100.0                        99.1                         0.87 250                         100.0                        99.6                         0.35 300                         1000                         99.9                         0.06 350                         1000                        1000                          0 01 CVGraph 6.02                                          1210912020                                              Page 212 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-30 Capsule X Lower Shell Plate R1808-3 (Longitudinal) CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/2020 4:40 PM A = 50.00 B = 50.00 C = 87.94 TO = 86.87 D = 0.00 Correlation Coefficient = 0 .949 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 86.90 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D 1136-2 O rientation: LT Capsule: X 100 -- - 90 

                  -                                                              I v
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               -300       -200        -100           0           100             200         300         400        500         600 Temperature {° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-31 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: LT Capsule: X Capsule X Lower Shell Plate R1808-3 (Longitudinal) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 78 45.0 45.0 0.03 100 40.0 57.4 -1 7.41 50 35.0 30.2 4.81 200 1000 92.9 7.09 30 25.0 21.5 3.47 60 45.0 35.2 9.82 11 0 60.0 62.9 -2.86 180 100.0 89.3 10.74 40 25.0 25.6 -0.62 90 60.0 51.8 8.22 220 100.0 95.4 4.62 60 25.0 35.2 -10.1 8 140 65.0 no -12.00 160 80.0 84.1 -4.07 130 85.0 72.7 12.27 CVGraph 6.02 12/03/2020 Page 2/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-32 Unirradiated Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 1:37 PM A= 40.60 B = 38.40 C = 89.14 TO= 34.22 D = 0.00 Correlation Coefficient = 0 .974 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 79.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@.)O ft-lbs= 9.00° F Templ[(J5 fl-lbs= 21.20° F Temp@50 ft-lb s= 56.50° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule : Unirrad 70 

  -- f lJ I

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     = 40 z

u> 30 20 10 0 

              -300       -200          -100          0            100          200          300          400         500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-33 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -75                        12.0                          8.3                        3.70
                   -50                        12.0                         12.3                       -0.28
                   -50                        170                          12.3                        4.72 0                        270                          26.5                        0.46 0                        280                          26.5                        1.46 0                        34.0                         26.5                        7.46 40                        35.0                         43.1                       -8.09 40                        360                          43.1                       -7.09 40                        40.0                         43.1                       -3.09 75                        46.0                         57.0                     -1104 75                        58.0                         57.0                        0.96 75                        68.0                         57.0                      10.96 125                         74.0                         70.1                        3.86 125                         79.0                         70.1                        8.86 200                         80.0                         77.2                        2.82 200                         81.0                         77.2                        3.82 200                         82.0                         77.2                        4.82 300                         77.0                         78.8                       -1.80 CVGraph 6.02                                          11/10/2020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-34 Capsule U Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:24 PM A = 37.60 B = 35.40 C = 69.07 TO = 52. 77 D = 0.00 Correlation Coefficient = 0.983 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 73.00 (Fixed) Lower Shelf Energy = 2 .20 (Fixed)

Temp@30 fl -lbs= 37.80° F Temp@35 ft-lbs= 47.70° F Temp(iV_,50 fl-lbs= 78.10° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: U 70 

  -- f lJ I

60 

   ~
     >. so QJ)
     ~
    ~
     = 40 z

u> 30 20 10 0 

              -300      -200           -100          0            100          200          300           400            500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-35 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: U Capsule U Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -40                        12.0                          6.7                        5.28 0                        15.0                         14.8                        0.1 8 20                        19.0                         220                        -2.96 40                        32.5                         31.1                        1.37 70                        45.0                         46.3                       -1.25 100                         59.5                         58.6                        0.87 120                         58.0                         64.2                       -6.16 125                         71.5                         65.2                        6.28 150                         71.0                         69.0                        2.00 175                         73.5                         71.0                        2.50 200                         69.5                         72.0                       -2.52 200                         67.0                         72.0                       -5.02 225                         81.5                         72.5                        8.98 325                         79.5                         730                         6.53 550                         70.0                         73.0                       -3.00 CVGraph 6.02                                          12/08/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-36 Capsule Y Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:26 PM A= 34.10 B = 31.90 C = 71.23 TO = 53.09 D = 0.00 Correlation Coefficient = 0.984 Equatio n is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 66.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 fl -lbs= 43.90° F Temp@35 ft-lbs= 55.20° F Temp(iV_,50 fl-lbs= 92.10° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: Y 

    ..0 50
  ¢::

I 40 

    ~

z 

     -=
      ~

ell QJ 30 u> 20 0 ..____.~....... ........ 

                               ~        ~....._~.............~....._~....._~....._~     .............~_._~_._~....._~.._        ....... .......
                                                                                                                                       ~       ~~
              -300      -200             -100              0            100           200              300      400              500            600 Temperature (° F)

CVGraph 6.02 12/08/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-37 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -40                         8.5                          6.6                        1.94 0                        12.0                         13.9                       -1.93 25                        26.0                         22.1                        3.87 50                        34.5                         32.7                        1.78 68                        34.0                         40.7                       -6.68 71                        44.0                         42.0                        2.04 100                         48.5                         52.5                       -4.02 125                         60.5                         58.5                        1.98 150                         66.5                         62.1                        4.44 175                         67.5                         640                         3.52 200                         70.0                         65.0                        5.02 200                         68.5                         65.0                        3.52 250                         60.0                         65.7                       -5.75 300                         640                          65.9                       -1.94 350                         67.0                         66.0                        1.02 CVGraph 6.02                                          12/08/2020                                            Page 2/2 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-38 Capsule V Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 2:47 PM A= 35.60 B = 33.40 C = 88. 74 TO = 85.32 D = 0.00 Correlation Coefficient = 0.976 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 69.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Ternp@.30 fl-lbs= 70.30° F Temp@35 fl-lbs= 83.80° F Ternp@50 fl-lbs=l 26.30° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule: V 60 

    ..0
  ¢::

I 50 

    ~

z 

     -=
      ~

ell QJ 40 30 u> 20 0 ..____.~ ....... ........ 

                                 ~        ~....._~.............~....._~....._~....._~     .............~_._~_._~....._~.._     ....... .......
                                                                                                                                      ~       ~~
              -300        -200             -100              0            100           200              300       400          500            600 Temperature (° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-39 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: V Capsule V Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                   -50                         3.0                          5.2                       -2.22 0                         5.0                         10.7                       -5.72 25                        170                          15.8                        115 50                        220                          23.0                       -0.97 75                        35.0                         31.7                        3.27 75                        32.0                         31.7                        0.27 100                         49.0                         411                         7.92 125                         39.0                         49.6                     -10.61 125                         50.0                         49.6                        0.39 150                         570                          56.4                        0.61 200                         65.0                         64.3                        0.68 250                         63.0                         67.4                       -4.41 300                         68.0                         68.5                       -0.48 350                         80.0                         68.8                      11.17 CVGraph 6 .02                                         11/10/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-40 Capsule X Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 12/3/2020 4:45 PM A= 36.10 B = 33.90 C = 62.45 TO= 121.11D=0.00 Correlation Coefficient = 0.970 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 70.00 (Fixed) Lower Shelf Energy= 2.20 (Fixed)

Ternp@.30 fl-lbs= l09.80° F Temp@35 fl-lbs=ll9.10° F Ternp@50 fl-lbs=l48.40° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule : X 60 

  -- f lJ I   50
   ~

QJ) 

     ,,_,  40
     ~
    ~
     =

z 30 u> 20 0 ................._...~......~---~.......~......~......~----~--~......~--~.......~.......~......~----~..... 

              -300              -200         -100          0            100          200          300         400         500          600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-41 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: X Capsule X Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 78 17.3 15.8 1.43 50 14.5 8.5 5.99 100 23.8 25.1 -1.31 200 68.0 65.0 3.02 110 280 30.1 -2.13 180 68.5 61.1 7.43 130 36.0 40.9 -4.89 150 46.5 50.8 -4.25 90 26.5 20.5 6.02 220 69.5 67.3 2.24 140 39.5 46.1 -6.55 120 37.8 35.5 2.25 160 50.5 54.8 -4.35 170 63.0 58.3 4.72 190 725 63.3 9.23 CVGraph 6.02 12/03/2020 Page 2/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-42 Unirradiated Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 1:46 PM A= 31.65 B = 30.65 C = 96. 79 TO = 35. 77 D = 0.00 Correlation Coefficient = 0.986 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 62.30 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 46.40° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule: Unirrad

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              -300              -200        -100           0            100          200           300          400 500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-43 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -75                         7.0                          6.6                        0.36
                   -50                         7.0                          9.9                       -2.90
                   -50                        110                           9.9                        110 0                        23.0                         20.8                        2.1 9 0                        20.0                         20.8                       -0.81 0                        24.0                         20.8                        3.19 40                        30.0                         33.0                       -2.99 40                        30.0                         33.0                       -2.99 40                        34.0                         33.0                        1 01 75                        36.0                         43.4                       -7.43 75                        44.0                         43.4                        0.57 75                        510                          43.4                        7.57 125                         55.0                         53.9                        108 125                         56.0                         53.9                        2.08 200                         62.0                         60.3                        169 200                         57.0                         60.3                       -3.31 200                         59.0                         60.3                       -1.31 300                         63.0                         62.0                        0.96 CVGraph 6.02                                          11110/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-44 Capsule U Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 2:22 PM A= 33.49 B = 32.49 C = 86.66 TO = 61.26 D = 0.00 Correlation Coefficient = 0.991 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 65.97 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 65.30° F Plant: Seabrnok 1 Mate rial: SA53381 Heat: D1136-2 Orientation: TL Capsule: U 70 0 

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              -300      -200        -100           0            100          200           300          400 500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-45 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: U Capsule U Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -40                         9.0                          6.7                        2.28 0                        14.0                         13.7                        0.29 20                        160                          19.1                       -3.09 40                        28.0                         25.7                        2.33 70                        36.0                         36.7                       -0.75 100                         45.0                         47.1                       -2.11 120                         51.0                         52.7                       -1.65 125                         59.0                         53.8                        5.16 150                         59.0                         58.5                        04 5 175                         62.0                         61.6                        0.42 200                         61.0                         63.4                       -2.43 200                         62.0                         63.4                       -1.43 225                         65.0                         64.5                        0.48 325                         71.0                         65.8                        5.1 8 550                         62.0                         66.0                       -3.97 CVGraph 6.02                                          1111012020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-46 Capsule Y Lower Shell Plate R1808-3 (Transverse) CVGrnph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 2:39 PM A= 29.22 B = 28.22 C = 63.86 TO = 62.81 D = 0.00 Correlation Coefficient = 0 .992 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 57.44 Lower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils= 76.10° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule: Y 

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              -300      -200       -100           0             100          200          300          400        500          600 Temperature (° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-47 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -40                         1.0                          3.2                       -2.1 7 0                         60                           7.9                       -1.92 25                        170                          14.2                        2.78 50                        24.0                         23.6                        0.37 68                        280                          31.5                       -3.51 71                        36.0                         32.8                        3.1 8 100                         43.0                         44.0                       -1.02 125                         48.0                         50.4                       -2.39 150                         58.0                         54.0                        4.02 175                         56.0                         55.8                        0.19 200                         58.0                         56.7                        1.32 200                         560                          56.7                       -0.68 250                         53.0                         57.3                       -4.28 300                         60.0                         57.4                        2.60 350                         57.0                         57.4                       -0.43 CVGraph 6 .02                                         11/10/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-48 Capsule V Lower Shell Plate R1808-3 (Transverse) CVGrnph 6 .02: Hyperbolic Tangent Curve Printed on 12/16/2020 9: 12 AM A= 29.15 B = 28.15 C = 85.43 TO = 84.88 D = 0.00 Correlation Coefficient = 0 .978 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 57.30 Lower Shelf L.E. = 1.00 (Fixed)

Temp@!35 mils=l02. 90° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: V

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              -300      -200       -100            0            100          200          300          400 500         600 Temperature(° F)

CVGraph 6.02 12/16/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-49 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: V Capsule V Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -50                         0.0                          3.3                       -330 0                         4.0                          7.8                       -3.79 25                        12.0                         12.1                       -0.12 50                        19.0                         18.3                        0.75 75                        280                          25.9                        2.09 75                        27.0                         25.9                        1.09 100                         39.0                         34.1                        4.92 125                         34.0                         41.5                       -7.47 125                         40.0                         41.5                       -1.47 150                         48.0                         47.2                        077 200                         570                          53.7                        3.27 250                         53.0                         56.1                       -3.14 300                         51.0                         56.9                       -5.93 350                         65.0                         57.2                        7.82 CVGraph 6.02                                          12116/2020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-50 Capsule X Lower Shell Plate R1808-3 (Transverse) CVGrnph 6 .02: Hyperbolic Tange nt Curve Printed on 12/8/20 20 5:46 PM A = 29.00 B = 28.00 C = 69.04 TO = 119.22 D = 0.00 Correlation Coefficient = 0 .967 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E = 57.00 (Fixed) Lower Shelf L.E = 1.00 (Fixed)

Temp@!35 mils= l34.30° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule: X

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              -300       -200       -100           0             100          200         300           400 500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-51 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: X Capsule X Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 78 13.5 14.0 -0.52 50 120 7.6 4.36 100 21.0 21.4 -0.40 200 62.0 52.1 9.92 110 23.0 25.3 -2.28 180 53.0 48.8 4.22 130 30.0 33.3 -3.34 150 40.0 40.7 -0.72 90 23.5 17.8 5.69 220 570 54.1 2.87 140 35.0 37.2 -2.1 8 120 29.5 29.3 0.19 160 38.5 43. 8 -5.35 170 44.0 46.5 -2.54 190 54.5 50.6 3.89 CVGraph 6 .02 12/08/2020 Page 2/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-52 Unirradiated Lower Shell Plate R1808-3 (Transverse) CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/10/2020 1:52 PM A = 50.00 B = 50.00 C = 80.38 TO = 38.49 D = 0.00 Correlation Coefficient = 0.970 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 38.50 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule : Uni rrad 100 - 90 

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               -300       -200        -100          0            100          200          300          400       500        600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-53 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Unirrad Unirradiated Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -75                          9.0                         5.6                        3.40
                   -50                         18.0                        10.0                        8.04
                   -50                         14.0                        10.0                        4.04 0                         29.0                        27.7                        1.27 0                         29.0                        27.7                        1.27 0                         25.0                        27.7                       -2.73 40                         52.0                        50.9                        1 06 40                         43.0                        50.9                       -7.94 40                         52.0                        50.9                        1 06 75                         54.0                        71.3                     -1 7.27 75                         59.0                        71.3                     -1 2.27 75                         920                         71.3                       20.73 125                         100.0                        89.6                       10.41 125                         1000                         89.6                       10.41 200                         1000                         98.2                        1 77 200                         100.0                        98.2                        177 200                         100.0                        98.2                        1 77 300                         1000                         99.9                        0.1 5 CVGraph 6.02                                          11/10/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-54 Capsule U Lower Shell Plate R1808-3 (Transverse) CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/1 0/2020 2:23 PM A = 50.00 B = 50.00 C = 69.69 TO= 71.76 D = 0.00 Correlation Coefficient = 0.975 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 71.80 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: U 100 --- - 90 

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               -300        -200        -100             0           100                     200         300         400        500           600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-55 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: U Capsule U Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -40                          0.0                         3.9                        -3.89 0                         20.0                        113                          8.69 20                         20.0                        18.5                         1.54 40                         30.0                        28.7                         133 70                         45.0                        48.7                        -3.74 100                          65.0                        69.2                        -4.22 120                          60.0                        80.0                      -1 9.97 125                        100.0                         82.2                       17.83 150                        1000                          90.4                         9.57 175                        1000                          95.1                         4.91 200                         100.0                        97.5                         2.46 200                         100.0                        97.5                         2.46 225                         100.0                        98.8                         1.22 325                         1000                         99.9                         0.07 550                         1000                        1000                          0 00 CVGraph 6.02                                          11/10/2020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-56 Capsule Y Lower Shell Plate R1808-3 (Transverse) CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/1 0/2020 2:40 PM A = 50.00 B = 50.00 C = 62.90 TO = 70.60 D = 0.00 Correlation Coefficient = 0.990 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 70.60 Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: Y 100 - -- -- 90 

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              -300        -200        -100     -    0           100           200           300          400     500        600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-57 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: Y Capsule Y Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -40                          0.0                         2.9                       -2.88 0                          5.0                         9.6                       -4.58 25                         30.0                        19.0                       11.00 50                         40.0                        34.2                        5.81 68                         45.0                        47.9                       -2.94 71                         40.0                        50.3                     -10.32 100                          70.0                        71.8                       -181 125                          90.0                        84.9                        5.06 150                        1000                          92.6                        7.41 175                          95.0                        96.5                       -1.51 200                         100.0                        98.4                        1.61 200                         100.0                        98.4                        1.61 250                         100.0                        99.7                        0.33 300                         1000                         99.9                        0.07 350                         1000                        1000                         0 01 CVGraph 6.02                                          11/10/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-58 Capsule V Lower Shell Plate R1808-3 (Transverse) CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/1 0/20203: 16 PM A = 50.00 B = 50.00 C = 76.03 TO = 92. 75 D = 0.00 Correlation Coefficient = 0 .992 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 92.80 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: TL Capsule: V 100 - -- 

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CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-59 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: V Capsule V Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                   -50                          5.0                         2.3                         2.71 0                         15.0                         8.0                         6.98 25                         15.0                        14.4                         0.60 50                         20.0                        24.5                        -4.51 75                         40.0                        38.5                         1.47 75                         40.0                        38.5                         1.47 100                          55.0                        54.8                         0.25 125                          70.0                        70.0                        -0.02 125                          60.0                        70.0                      -1 0.02 150                          90.0                        81.8                         8.16 200                         100.0                        94.4                         5.62 250                         100.0                        98.4                         1.57 300                         100.0                        99.6                         0.43 350                         1000                         99.9                         0.11 CVGraph 6.02                                          1111012020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-60 Capsule X Lower Shell Plate R1808-3 (Transverse) CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/2020 2:45 PM A = 50.00 B = 50.00 C = 75.01 TO = 128.83 D = 0.00 Correlation Coefficient = 0 .910 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear = 128.90 Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: TL Capsule: X 100 - - 90 

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              -300        -200        -100            0            100           200          300        400        500        600 Temperature {° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-61 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: TL Capsule: X Capsule X Lower Shell Plate R1808-3 (Transverse) Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 78 30.0 20.5 9.50 50 30.0 10.9 19.11 100 30.0 31.7 -1.67 200 1000 87.0 13.04 110 35.0 37.7 -2.70 180 100.0 79.6 20.35 130 40.0 50. 8 -1 0.78 150 55.0 63.7 -8.75 90 35.0 26.2 8.80 220 1000 91.9 8.09 140 40.0 57.4 -17.39 120 45.0 44.1 0.86 160 60.0 69.7 -9.66 170 70.0 75.0 -4.98 190 1000 83.6 16.37 CVGraph 6.02 12/03/2020 Page 212 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-62 Unirradiated Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 3:35 PM A = 81.10 B = 78.90 C = 69.90 TO= -20.77 D = 0.00 Correlation Coefficient = 0.894 Equation is A + B * [Tanh((T-TO)/(C+DT))] Upper Shelf Energy = 160.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed) Temp@30 ft-lbs=-74.60° F Temp@35 fl-lbs=-67.50° F Temp(ty50 fl-lbs=-49.80° F Plant: Seabrnok 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Uni rrad 180 0 160  : 0 

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I 120 01 

    >. 100
                  -                            o~

bl) QI 

   ~

z 

    =       80 oop u        60 40 J

20 i o/ _/c~c:Po I I I I 0 

              -300       -200         -100            0            100          200         300           400          500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-63 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Unirrad Unirradiated Weld Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -100                           8.0                       170                        -9.02
                  -100                         260                         170                         8.98
                   -75                         12.0                        29.8                     -1 7.79
                   -75                         43.0                        29.8                       13.21
                   -75                         76.0                        29.8                       46.21
                   -60                         14.0                        41.0                     -26.95
                   -60                         15.0                        41.0                     -25.95
                   -50                         760                         49.9                       26.09
                   -50                         84.0                        49.9                       34.09
                   -40                         12.0                        59.9                     -47.93
                   -40                         130                         59.9                     -46.93
                   -25                         69.0                        76.3                       -7.33
                   -25                         90.0                        76.3                       13.67
                   -25                        11 5.0                       76.3                       38.67 0                       114.0                        103.9                       10. 12 0                        115.0                       1039                        11.12 40                        1200                        136.4                     -1 6.42 40                        128.0                       136.4                       -84 2 120                        154.0                       157.2                       -3.24 120                        154.0                       157.2                       -3.24 120                        175.0                       157.2                       17.76 250                        157.0                       159.9                       -2.93 CVGraph 6.02                                          11/10/2020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-64 Capsule U Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:28 PM A= 73.10 B = 70.90 C = 53.28 TO= -1L68 D = 0.00 Correlation Coefficient = 0.975 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 144.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 f t-lbs=-49.20° F Temp@35 fl-lbs=-43.60° F Temp(ty50 fl-lbs=-29.60° F Plant: Seabrnok 1 Material : SAW Heat: 4P6052 Orientation: NA Capsule : U 160 0 0 140 120 

  --f l)
   .:i.
  ¢::

I 100 bl) 

    ;... 80 QI
   ~=

z 60 u 40 20 0 

              -300      -200           -100          0            100          200          300          400          500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-65 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: U Capsule U Weld Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -80                           7.0                        12.3                       -5.33
                  -50                          35.0                        29.4                        5.60
                  -40                          48.0                        38.6                        9.39
                  -20                          30.5                        62.1                     -31.62
                  -20                          69.0                        62.1                        6.88 0                         1015                         88.4                       13.10 0                          93.5                        88.4                        5.1 0 40                        123.0                        126.2                       -3.18 70                        133.0                        137.7                       -4.69 100                        138.0                        141.9                       -3.89 150                         143.0                       143.7                       -0.67 225                         142.5                       144.0                       -1.48 325                         157.0                       144.0                       1300 550                         153.0                       144.0                        9.00 CVGraph 6.02                                          12/08/2020                                              Page 212 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-66 Capsule Y Weld CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:30 PM A= 73.10 B = 70.90 C = 64.44 TO= -4.86 D = 0.00 Correlation Coefficient = 0 .958 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 144.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 f t-lbs=-50.30° F Te mp@35 fl-lbs=-43.50° F Temp(ty50 fl-lbs=-26 .60° F Plant: Seabrnok 1 Material : SAW Heat: 4P 6052 Orientation: NA Capsule : Y 160 140 120 

  --f l)
   .:i.
  ¢::

I 100 bl) 

    ;... 80 QI
   ~=

z 60 u 40 20 0 

              -300      -200           -100          0            100          200          300          400          500           600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-67 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Y Capsule Y Weld Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -80                           4.5                        14.7                     -1 0.25
                  -40                          27.5                        37.9                     -1 0.36
                  -25                          44.0                        51.6                       -7.63 0                         1045                         78.4                       26.07 25                         102.0                       103.8                       -1.78 50                         132.5                       122.1                       10.36 68                        132.5                        130.6                        1.89 72                        104.0                        132.0                     -28.05 100                        11 9.0                       138.7                     -1 9.73 125                        126.0                        141.5                     -1 5.52 175                         149.0                       143.5                        5.53 200                         140.0                       143.8                       -3.75 200                         147.5                       143. 8                       3.75 250                         135.5                       143.9                       -8.45 300                         146.5                       144.0                        2.51 CVGraph 6 .02                                         12/08/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-68 Capsule V Weld CVGrdph 6.02: Hyperbolic Tangent Curve Printed on 1Iil 1/2020 10:22 AM A= 79.10 B = 76.90 C = 55.82 TO= 9.19 D = 0.00 Correlation Coefficient = 0.950 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 156.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 f t-lbs=-32.90° F Temp@35 fl-lbs=-27.20° F Temp(ty50 fl-lbs=-13.00° F Plant: Seabrnok 1 Material : SAW Heat: 4P6052 Orientation: NA Capsule: V 180 8 160 

                 -                                                   v-         (~    0
                                                                                             \I'                  :

140  : It i)  : i 

  --f l)
   .:i.

120 c/ I .... 

  ¢::
    >. 100
   ~

bl) QI 

    =       80 oc!

I z .... u 60 v 40 J 20 l 

                                        ~Voo i

I I I 0 

              -300       -200          -100          0            100          200          300          400          500         600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-69 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: V Capsule V Weld Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -90                           60                          6.5                       -048
                  -50                           9.0                        18.7                       -9.67
                  -35                          130                         284                      -1 54 0
                  -25                          74.0                        37.1                       36.88
                  -25                          40.0                        37.1                        2.88 0                          70.0                        66.6                        344 25                          58.0                       100.3                     -42.32 25                        108.0                        100.3                        7.68 50                        124.0                        127.1                       -3.07 75                        167.0                        142.7                       24.29 75                         170.0                       142.7                       27.29 100                         142.0                       150.3                       -8.28 200                         150.0                       155.8                       -5.84 250                         150.0                       156.0                       -5.97 300                         155.0                       156.0                       -1.00 CVGraph 6.02                                          11/11/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-70 Capsule X Weld CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/2020 4:47 PM A = 63.10 B = 60.90 C = 65.30 TO = -1.06 D = 0.00 Correlation Coefficient = 0 .816 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 124.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 f t-lbs=-40.80° F Temp@35 fl-lbs=-33.60° F Temp(ty50 fl-lbs=-15 .30° F Plant: Seabrnok 1 Material : SAW Heat: 4P6052 Orientation: NA Capsule : X 140 120 

  --f l)
   .:i.
  ¢::

I 100 

  '-'       80 bl)

QI 

   ~=       60 z

u 40 20 0 

              -300      -200           -100          0            100          200          300          400          500          600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-71 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: X Capsule X Weld Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -25                          62.5                        41.7                       20.78 0                         41.5                        64.1                     -22.59 25                          82.0                        86.2                       -4.19 100                         123.0                       118.7                        4.27 130                         123.5                       121.8                        1.66
                  -50                           4.8                        24.4                     -1 9.69
                  -15                          730                         50.3                       22.71 15                          50.0                        77.8                     -27.78 90                        126.5                        11 6.9                       9.56
                  -10                          70.0                        54.8                       15.19
                  -30                          18.0                        37.7                     -1 9.75 60                         104.5                       107.7                       -3.24
                  -20                          11.5                        45.9                     -34.41
                    -5                       1200                          59.4                       60.57 40                          90.5                        97.0                       -6.53 CVGraph 6.02                                          12/03/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-72 Unirradiated Weld CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/10/2020 3:38 PM A = 45.20 B = 44.20 C = 60.81 TO = -32.83 D = 0.00 Correlation Coefficient = 0.857 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 89.4 1 Lower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-47.10° F Plant: Seabrnok 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Uni rrad 100 90 A -. 80 

                                                         /

o<( {~ 

  *--E rll 70
                   ~

_J c 60 . 

   *-c=

r ll ... oOJ 0-1  : 

     ~       50 Q.
     ~             ,_
   ~
   -         40         ;                                                                                   :
   -                                        I
     ~
     ~             ~
     ~
     ~       30
   ~               ~

oj 20 10

</_n ...,

_/c I 

                                      ~

(j)O I I I 0 

               -300       -200      -100            0            100          200           300         400   500        600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-73 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Unirrad Unirradiated Weld Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -100                         3.0                          9.7                       -6.75
                  -100                        14.0                          9.7                        4.25
                   -75                         6.0                         18.7                     -12.67
                   -75                        28.0                         18.7                        9.33
                   -75                        52.0                         18.7                       33.33
                   -60                         7.0                         26.7                     -1 9.67
                   -60                        10.0                         26.7                     -1 6.67
                   -50                        53.0                         33.0                       19.95
                   -50                        58.0                         33.0                       24.95
                   -40                         7.0                         40.0                     -33.02
                   -40                        11.0                         40.0                     -29.02
                   -25                        45.0                         50.9                       -5.86
                   -25                        60.0                         50.9                        9.14
                   -25                        74.0                         50.9                       23.14 0                        75.0                         67.0                        8.01 0                        720                          67.0                        5.01 40                        720                          82.0                     -1 0.02 40                        770                          82.0                       -5.02 120                        90.0                         88.8                        1.17 120                        91.0                         88.8                        2.17 120                        90.0                         88.8                        1.1 7 250                        90.0                         89.4                        0.60 CVGraph 6.02                                          11/10/2020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-74 Capsule U Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 4:25 PM A= 44.94 B = 43.94 C = 46.23 TO= -21.71D=0.00 Correlation Coefficient = 0 .970 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 88.87 Lower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-32.30° F Plant: Seabrnok 1 Material : SAW Heat: 4P6052 Orientation: NA Capsule : U 100 90 

                                                            ..... ti\
                                                                         -        0             v          :

80 1' 0 

  *-E-rll 70 c/                                                       '
                 ~

0 c 60 

  *-c=

r ll ... r 

    ~       50 Q.
    ~            ,_
   ~
   -        40         ;                                                                                   :
    ~
    ~
    ~
                 ~                           c
    ~       30         '                                  .                                                '
   ~

20 

                 ~

1o 10

/
                                   ~  ~                   I                                         I      I 0
              -300       -200       -100           0             100          200          300         400   500        600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-75 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: U Capsule U Weld Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                   -80                                  4.0                               7.5                              -3.53
                   -50                                26.0                               21.0                               5.03
                   -40                                36.0                               28.4                               7.59
                   -20                                25.0                               46.6                            -21.56
                   -20                                51.0                               46.6                               4.44 0                               73.0                               64.2                               8.83 0                               65.0                               64.2                               0.83 40                                83.0                               83.2                              -0.18 70                                90.0                               87.2                               2.76 100                                91.0                               88.4                               2.58 150                                89.0                               88.8                               0.1 8 225                                87.0                               88.9                              -1.87 325                                88.0                               88.9                              -0.87 550                                85.0                               88.9                              -3.87 Note : Consistent w ith the previous capsule analysis, one data point at 70°F and 92 mils of LE was excluded due to a lack of corresponding absorbed energy data.

CVGraph 6.02 11110/2020 Page 212 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-76 Capsule Y Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 4:33 PM A= 42.21B=41.21C=32.23 TO= -17. 14 D = 0.00 Correlation Coefficient = 0 .979 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 83.43 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-22.80° F Plant: Seabrnok 1 Material : SAW Heat: 4P 6052 Orientation: NA Capsule : Y 100 90 n B (~ 80 

                                                         , - (I)
                                                                       ,....            0                     ;
                                                   ,/00
  *-E-rll 70
                 ~

lo c 60 . 

  *-c=

r ll ... 

    ~       50 Q.
    ~            ,_
   ~
   -        40         ;                                                                                      :
    ~
    ~            ~
    ~
    ~       30 IJ
   ~             ~

20 10

t 0

l/.... I I I 

              -300       -200       -100            0            100            200           300         400   500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-77 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Y Capsule Y Weld Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -80                          0.0                          2.6                       -2.63
                  -40                         170                          17.1                       -0.07
                  -25                         29.0                         32.4                       -3.36 0                         710                          62.3                        8.72 25                         67.0                         77.8                     -10.81 50                         77.0                         82.2                       -5.17 68                         83.0                         83.0                       -0.01 72                         720                          83.1                     -11.10 100                         81.0                         83.4                       -2.37 125                         84.0                         83.4                        0.59 175                         91.0                         83.4                        7.57 200                         87.0                         83.4                        3.57 200                         89.0                         83.4                        5.57 250                         86.0                         83.4                        2.57 300                         87.0                         83.4                        3.57 CVGraph 6.02                                          11110/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-78 Capsule V Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 4:53 PM A = 44.63 B = 43.63 C = 54.30 TO = -3.39 D = 0.00 Correlation Coefficient = 0.949 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 88.27 Lower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-15.50° F Plant: Seabrnok 1 Material : SAW Heat: 4P 6052 Orientation: NA Capsule: V 100 

                 '"                                               Oc~

90 80 y - (I) 

                                                                                                  ~i..
                                                                                                  ~~

i 

   ,-.,          '"                                         of
  *-E-rll 70                                                                                                  '

c 60 

                 ~

II . 

  *-c=

r ll ... 

    ~       50                                 ...,    ~

Q. 

    ~
   ~
   -        40         ;
                                                     'J     0
    ~
    ~            ~
    ~
    ~       30
   ~

20 

                 ~

T 10 IOU I 

                 '"                ~

I I I 0 

              -300       -200       -100               0             100          200           300         400   500         600 Temperature(° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-79 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: V Capsule V Weld Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -90                          2.0                          4.5                       -2.45
                  -50                          7.0                         14.3                       -7.29
                  -35                          9.0                         21.8                     -12.76
                  -25                         50.0                         28.1                       21.87
                  -25                         30.0                         28.1                        1.87 0                         49.0                         47.4                        1.64 25                         42.0                         65.6                     -23.58 25                         730                          65.6                        7.42 50                         80.0                         77.6                        2.44 75                         93.0                         83.7                        9.34 75                         86.0                         83.7                        2.34 100                         920                          86.4                        5.62 200                         85.0                         88.2                       -3.22 250                         89.0                         88.3                        0.74 300                         80.0                         88.3                       -8.27 CVGraph 6.02                                          11/10/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-80 Capsule X Weld CVGrnph 6 .02: Hyperbolic Tange nt Curve Printed on 12/3/20 20 3:44 PM A= 41.30 B = 40.30 C = 62.32 TO= -5.41 D = 0.00 Correlation Coefficient = 0.815 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 81.60 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-15.20° F Plant: Seabrnok 1 Material : SAW Heat: 4P6052 Orientation: NA Capsule: X 70

  • rll
   -==     60
  *-=rll
     ~

Q. so 

     ~     40
   ~
     ~

QJ 30 

     ~
   ~

10 t-~~-+-~~~t---.r--~-+-~~--1~~~-+-~~-+~~~+-~~-+~~----1 0 0 ol:::::::::c::::+/-=::c......L---'-___JL-..J.........L---J~..L.--'-__J~..1-....L---1.~..l...,_....1...._J 

              -300      -200       -100            0            100          200           300          400 500        600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-81 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: X Capsule X Weld Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -25                         42.0                         29.0                       12.97 0                        31.0                         44.8                     -13.79 25                         58.0                         59.5                       -1.54 100                         81.0                         79.0                        2.05 130                         80.0                         80.6                       -0.57
                  -50                          3.5                         16.5                     -13.05
                  -15                         50.0                         35.1                       14.85 15                        35.0                         54.0                     -1 9.04 90                         84.0                         78 0                        6.01
                  -10                         49.5                         38.3                       11.16
                  -30                         14.5                         26.2                     -11.67 60                         71.5                         72.8                       -1.30
                  -20                          8.0                         32.0                     -24.03
                    -5                        80.0                         41.6                       38.44 40                         60.5                         66.4                       -5.87 CVGraph 6.02                                          1210312020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-82 Unirradiated Weld CVGraph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/1 0/2020 3:42 PM A = 50.00 B = 50.00 C = 82.20 TO = -41.94 D = 0.00 Correlation Coefficient = 0 .929 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature al 50% Shear = -4 l.90 Pla nt: Seabrnok 1 Material: SAW Heat: 4P6052 O rientation: NA Capsule : Uni rrad 100 - i.--- -- 90 

                  ~
                                                             /

80 

                  ~

0( )lo . 

                  ..                                  I   0 70          :

cf 

                  ~

l- 

    ~

QJ 60 . . . 

  .c              ..
   ...c 00 50                               Ef QJ
    ~

l-OJ . QJ 40 p.. 30 

                  ~
                        ..                 c/o              .                                                    :
                  -                     <( 0 vv
                                                                                                                 ~

20 

                  ~
                                      ))                    .
                           -v 10 0
               -300        -200        -100          0           100           200           300          400      500        600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-83 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Unirrad Unirradiated Weld Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -100                         18.0                        19.6                       -1.58
                  -100                         25.0                        19.6                        5.42
                   -75                         23.0                        30.9                       -7.91
                   -75                         34.0                        30.9                        3.09
                   -75                         48.0                        30.9                       17.09
                   -60                         29.0                        39.2                     -10. 19
                   -60                         29.0                        39.2                     -1 0.1 9
                   -50                         52.0                        45.1                        6.89
                   -50                         54.0                        45.1                        8.89
                   -40                         29.0                        51.2                     -22.1 8
                   -40                         37.0                        51.2                     -14.1 8
                   -25                         55.0                        60.2                       -5.16
                   -25                         64.0                        60.2                        3.84
                   -25                         84.0                        60.2                       23.84 0                         82.0                        73.5                        8.50 0                         82.0                        73.5                        8.50 40                         75.0                        88.0                     -13.01 40                         82.0                        88.0                       -6.01 120                        1000                         98.1                        1.9 1 120                        1000                         98.1                        1.91 120                        100.0                        98.1                        1.91 250                        100.0                        99.9                        0.08 CVGraph 6.02                                          11/10/2020                                              Page 2/2 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-84 Capsule U W eld CVGrnph 6.02: Hyperbolic Tangent Curve P rinted on 1 1/10/2020 4:26 PM A = 50.00 B = 50.00 C = 41. 70 TO = -25.65 D = 0.00 Correlation Coefficient = 0.952 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Tempernlure al 50% Shear= -25.60 Plant: Seabrnok 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: U 100 

                 ~

90 

                 ~

80 ' 70  : 

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              -300        -200        -100                  0           100           200          300        400        500        600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-85 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: U Capsule U Weld Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -80                               10.0                                6.9                             3.13
                  -50                               30.0                               23.7                             6.28
                  -40                               40.0                               33.4                             6.56
                  -20                               30.0                               56.7                           -26.74
                  -20                               55.0                               56.7                            -1.74 0                              100.0                               77.4                            22.61 0                               80.0                               77.4                             2.61 40                               90.0                               95.9                            -5.89 70                              1000                                99.0                             1 01 100                              1000                                99.8                             0.24 150                              100.0                              100.0                             0.02 225                              100.0                              100.0                             0.00 325                              100.0                              1000                              0.00 550                              1000                               1000                              000 Note: Consistent with the previous capsule analysis, one data point at 70°F and 100% shear was excluded due to a lack of corresponding absorbed energy data.

CVGraph 6.02 11110/2020 Page 2/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-86 Capsule Y Weld CVGraph 6.02: H yperbolic Tangent Curve Printed on 11/10/2020 4:34 PM A = 50.00 B = 50.00 C = 50.67 TO = -22.64 D = 0.00 Correlation Coefficient = 0.958 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear= 0.00 (Fixed)

Temperature al 50% Shear= -22.60 Plant: Seabrnok 1 Material: SAW H eat: 4P6052 Orientation: NA Capsule: Y 100 - -- -- 90 

                 ~

I: - ..... 80 

                 ~

o/ .- ' 

                 ..                                  lo       0 70         :

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              -300       -200
                                     -100          0            100           200          300        400        500         600 Temperature {° F)

CVGraph 6.02 11/ 10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-87 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: Y Capsule Y Weld Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -80                           0.0                          9.4                      -9.42
                  -40                          30.0                        33.5                       -3.51
                  -25                          50.0                        47.7                        2.32 0                          85.0                        710                        14.03 25                          75.0                        86.8                     -11.77 50                         100.0                        94.6                        5.38 68                          90.0                        97.3                       -7.28 72                          75.0                        97.7                     -22.67 JOO                          90.0                        99.2                       -9.22 125                          90.0                        99.7                       -9.71 175                         100.0                       100.0                        0.04 200                         100.0                       100.0                        0.02 200                         100.0                       1000                         0.02 250                         1000                        100 0                        000 300                         1000                        1000                         0 00 CVGraph 6 .02                                         I 1/10/2020                                            Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-88 Capsule V Weld CVGraph 6.02: Hyperbolic Tangent Curve Printed on 11/10/2020 4:56 PM A= 50.00 B = 50.00 C = 51.03 TO = -6.88 D = 0.00 Correlation Coefficient = 0 .995 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf %Shear = 100.00 (Fixed) Lower Shelf %Shear= 0.00 (Fixed)

Temperature al 50% Shear = -6.80 Plant: Seabrnok 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: V 100 - -- 

                 ~
                                                            /~

90 80 

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              -300        -200        -100            0           100           200         300        400        500        600 Temperature {° F)

CVGraph 6.02 11/10/2020 Page 1/2 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-89 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: V Capsule V Weld Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -90                           5.0                         3.7                        1.29
                  -50                          15.0                        15.6                       -0.58
                  -35                          20.0                        24.9                       -4.94
                  -25                          40.0                        33.0                        7.04
                  -25                          30.0                        33.0                       -2.96 0                          60.0                        56.7                        3.30 25                          70.0                        77.7                       -7.72 25                          80.0                        77.7                        2.28 50                          90.0                        90.3                       -0.28 75                        1000                          96.1                        3.88 75                          98.0                        96.1                        1.88 100                          98.0                        98.5                       -0.51 200                         100.0                       1000                         0.03 250                         1000                        1000                         000 300                         1000                        1000                         0 00 CVGraph 6 .02                                         1111012020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-90 Capsule X Weld CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/2020 3:46 PM A= 50.00 B = 50.00 C = 95.94 TO = 10.02 D = 0.00 Correlation Coefficient = 0.886 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear= 0.00 (Fixed)

Temperature at 50% Shear= 10.10 Plant: Seabrnok 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: X 100 90 v 

                                                                           /
                  ,_                                                    )0 7

80 70 

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              -300 L/
                         -200        -100 0

0 I 100 200 300 I 400 I 500 600 Temperature(° F) CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-91 Plant: Seabrook 1 Material: SAW Heat: 4P6052 Orientation: NA Capsule: X Capsule X Weld Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -25                          40.0                        32.5                         7.48 0                         40.0                        44.8                        -4.80 25                         65.0                         57.7                         7.25 100                          85.0                        86.7                        -1.71 130                          85.0                        92.4                        -7.42
                  -50                           5.0                        22.2                      -1 7.25
                  -1 5                         45.0                        37.2                         7.75 15                          40.0                        52.6                     -12.59 90                          85.0                        84.1                         0.88
                  -10                          45.0                        39.7                         5.28
                  -30                         30.0                         30.3                        -0.28 60                         70.0                         73.9                        -3.92
                  -20                          15.0                        34.8                     -19.85
                    -5                        70.0                         42.2                       27.76 40                         65.0                         65.1                        -0.14 CVGraph 6.02                                          12/03/2020                                              Page 212 WCAP-18607-NP                                                                                                          March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-92 Unirradiated Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:19 PM A = 66.10 B = 63.90 C = 139.95 TO= -104.19 D = 0.00 Correlation Coefficient = 0.886 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 130.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 ft-lbs=-1 93.70° F Temp@35 ft-lbs=-178.60° F Temp@.50 fl-lb s=-140.20° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: Uni rrad 160 140 120 

  --f l)
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    ;... 80 QI
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              -300      -200          -100          0            100          200          300          400         500          600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-93 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Unirrad Unirradiated Heat Affected Zone Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -200                         15.0                        28.1                     -13. 11
                  -200                         19.0                        28.1                       -9.11
                  -175                         260                         36.3                     -10.27
                  -175                         3 1.0                       36.3                       -5.27
                  -175                         56.0                        36.3                       19.73
                  -1 50                        47.0                        45.9                        110
                  -150                         730                         45.9                       27.10
                  -150                         80.0                        45.9                       34.10
                  -100                         38.0                        68.0                     -30.01
                  -100                         47.0                        68.0                     -21.01
                  -100                         86.0                        68.0                       17.99
                   -60                         54.0                        85.6                     -31.63
                   -60                         55.0                        85.6                     -30.63
                   -60                        108.0                        85.6                       22.37 0                       108.0                       106.5                        1.52 0                       121.0                       106.5                       14.52 40                       125.0                       115.6                        9.44 40                       142.0                       11 5.6                      26.44 110                        108.0                       124.3                     -1 6.28 110                        132.0                       124.3                        7.72 11 0                       132.0                       124.3                        7.72 250                        142.0                       129.2                       12.80 CVGraph 6 .02                                         11/11/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-94 Capsule U Heat Affected Zone CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:43 PM A = 68.10 B = 65.90 C = 106.37 TO = -29.18 D = 0.00 Correlation Coefficient = 0.860 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 134.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 ft-lbs=-99.30° F Temp@35 fl-lbs=-87.90° F Temp(ty50 fl-lbs=-59.10° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: U 180 

                  -    :                                                                          ("\

160 

                  -                                                  (~

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              -300       -200         -100          0               100          200          300          400           500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-95 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: U Capsule U Heat Affected Zone Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -80                          32.0                        38.8                       -6.81
                  -40                          89.0                        61.4                       27.58
                  -40                          79.0                        61.4                       17.58
                  -20                          62.5                        73.8                     -11.27 0                          52.0                        85.7                     -33.74 20                          71.0                        96.6                     -25.57 40                        121.5                        105.8                       15.71 70                        130.0                        116.3                       13.68 100                        1475                         123.3                       24.17 150                        142.5                        129.6                       12.89 175                         111.0                       131.2                     -20.22 200                         138.0                       132.3                        5.75 225                         11 8.5                      132.9                     -14.40 325                         161.5                       133.8                       27.67 550                         132.0                       134.0                       -2.00 CVGraph 6.02                                          12/08/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-96 Capsule Y Heat Affected Zone CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/8/2020 5:55 PM A= 58.10 B = 55.90 C = 53.47 TO= -16.47 D = 0.00 Correlation Coefficient = 0 .938 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 114.00 (Fixed) Lower Shelf Energy= 2.20 (Fixed)

Temp@30 ft-lbs=-46.00° F Temp@35 fl-lbs=-39.90° F Temp(ty50 fl-lbs=-24.20° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: Y 160 140 120 

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              -300      -200          -100          0            100          200          300         400          500         600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-97 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Y Capsule Y Heat Affected Zone Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -80                          15.5                        11.7                        3.80
                  -40                          32.5                        35.0                       -247
                  -25                          46.5                        49.3                       -2.76 0                          710                         74.8                       -3.79 25                         116.0                        944                        21.56 50                         100.0                       1054                        -541 68                          95.5                       1094                      -13.95 72                        102.0                        110.1                       -8.06 100                        102.0                        11 2.6                    -1 0.58 125                        107.0                        11 34                       -644 175                         111.5                       113.9                       -241 200                         148.0                       114.0                       34.03 200                         115.5                       114.0                        1.53 250                         108.0                       114.0                       -5.99 300                         120.5                       114.0                        6.50 CVGraph 6.02                                          12/08/2020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-98 Capsule V Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/20 20 12:43 PM A= 66.10 B = 63.90 C = 75.78 TO = -6.05 D = 0.00 Correlation Coefficient = 0 .930 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 130.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

Temp@30 ft-lbs=-54.50° F Temp@35 fl-lbs=-46.30° F Temp(ty50 fl-lb s=-25.50° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: NA Capsule: V 160 0 140 0 0 120 

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              -300      -200          -100          0            100          200          300          400            500         600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-99 Plant: Seabrook 1 Material: SA533Bl Heat: D 1136-2 Orientation: NA Capsule: V Capsule V Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input CVN Computed CVN Differential 

                  -90                          36.0                        14.8                      21.23
                  -75                          23.0                        20.0                        2.98
                  -50                          28.0                        32.7                       -4.70
                  -25                          36.0                        50.4                     -1 4.44 0                          730                         71.2                        1.81 25                          89.0                        90.9                       -1.91 25                        107.0                         90.9                      16.09 50                          76.0                       106.3                     -30.29 75                        150.0                        11 6.5                     33.47 100                        123.0                        122.7                        0.34 125                        137.0                        126.1                      10.90 150                         106.0                       128.0                     -21.95 200                         121.0                       129.4                       -845 250                         137.0                       129.9                        7.1 5 300                         136.0                       130.0                        6.04 CVGraph 6.02                                          11/11/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-100 Capsule X Heat Affected Zone CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/2020 4:02 PM A= 60.10 B = 57.90 C = 73.32 TO = 20.27 D = 0.00 Correlation Coefficient = 0 .972 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf Energy = 118.00 (Fixed) Lower Shelf Energy = 2.20 (Fixed)

TempCft 30 ft-lbs=-21.90° F Temp:@35 fl-lbs=-13 .70° F Temp@50 ft-lbs= 7.40° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: NA Capsule: X 140 120 

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QI 

   ~=       60 z

u 40 20 0 

              -300         -200          -100          0            100          200          300          400       500          600 Temperature(° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-101 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: X Capsule X Heat Affected Zone Charpy V-Notch Data Temperature (0 F) InputCVN Computed CVN Differential 

                  -25                          29.0                        28.3                        0.71 0                         49.0                        44.5                        4.51 25                          50.5                        63.8                     -13.33 100                         121.0                       106.2                       14.81 130                         118.0                       11 2.5                       5.53
                  -50                          24.5                        170                         7.45
                  -1 5                         31.0                        34.2                       -3.21 15                          66.8                        55.9                       10.81 90                        1070                         103.0                        4.04
                  -10                          40.5                        37.5                        3.03
                  -30                          31.5                        25.6                        5.86 60                          88.0                        88.7                       -0.73
                  -20                          22.5                        31.2                       -8.65
                    -5                         42.5                        40.9                        1.60 40                          62.5                        75.3                     -1 2.81 CVGraph 6 .02                                         12/03/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-102 Unirradiated Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:26 PM A = 40.98 B = 39.98 C = 148.95 TO = -97.82 D = 0.00 Correlation Coefficient = 0.888 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 80.96 Lower Shelf L.E. = 1.00 (Fixed)

Ternp@35 mils=-120.20° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: Unirrad

  • rll
   -==     60   1----~____,f--~---+-----+-l-+--+~~-+-~~-+-~~-+-~~-+-~~-+-~---1
   *;; so       ~~,....-~1---E~--t~-1-~-+~~~-+~~~-+~~~-+-~-:--~-+-~...,..-~+-~...,.-~
    =~

Q. 

     ~     40   ~~~-f----L---<f--._--~-+-~~--1~~~-+-~~-+~~~+-~~-+~~--1
   ~
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     ~

30 J--___;~-+--'-{'}11'---+-~~--t~~~-+-~~~f--~~-+~_;_~+-~'----+~~~~ 0 ................._...~......~---~.......~......~......~----~--~......~--~.......~.......~......~----~..... 

              -300              -200        -100           0            100          200          300          400 500        600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-103 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Unirrad Unirradiated Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -200                        10.0                         17.2                       -7.18
                  -200                        10.0                         17.2                       -7.18
                  -175                        170                          21.9                       -4.94
                  -175                        170                          21.9                       -4.94
                  -175                        32.0                         21.9                       10.06
                  -1 50                       30.0                         27.5                        2.48
                  -150                        41.0                         27.5                       13.48
                  -150                        50.0                         27.5                       22.48
                  -100                        210                          40.4                     -1 9.40
                  -100                        26.0                         40.4                     -14.40
                  -100                        54.0                         40.4                       13.60
                   -60                        33.0                         50.9                     -1 7.92
                   -60                        39.0                         50.9                     -11.92
                   -60                        60.0                         50.9                        9.08 0                       66.0                         640                         1.98 0                       74.0                         64.0                        9.98 40                       76.0                         70.1                        5.90 40                       83.0                         70.1                       12.90 110                        640                          76.3                     -1 2.34 110                        780                          76.3                        1.66 11 0                       78.0                         76.3                        1.66 250                        76.0                         80.2                       -4.22 CVGraph 6.02                                          1111112020                                            Page 212 WCAP-18607-NP                                                                                                        March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-104 Capsule U Heat Afected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:32 PM A = 41.89 B = 40.89 C = 107.38 TO = -38.99 D = 0.00 Correlation Coefficient = 0.907 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf LE.= 82.79 Lower Shelf LE. = 1.00 (Fixed)

Temp@35 mils=-57.20° F Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: U

  • rll
   -==     60   1--~____,f--~---+~~-+.,._~-+-~~-+-~~-+-~~-+-~~-+-~----1
   *;; so       ~~~~1----~~--t~~~.-~~~--+~~~-+-~~~--~~~--~~~--~~~
    =~

Q. 

     ~     40   ~~~-+~~~-t-~+--tt~~~-+--~~~t--~~-+-~~~+-~~-+~~~~
   ~
   ~
   ~
    -~
     ~

30 t--~~~f--~~----1----,r--~-+~~~-+~~~--+-~~~-+-~~~-+-~~~-+-~~---1 0 ................._...~......~---~.......~......~......~----~--~......~--~.......~.......~......~----~..... 

              -300              -200        -100          0            100           200          300          400 500        600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-105 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: U Capsule U Heat Afected Zone Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -80                         21.0                         270                        -5.99
                  -40                         560                          41.5                       14.49
                  -40                         52.0                         41.5                       10.49
                  -20                         42.0                         49.1                       -7.05 0                         40.0                         56.1                     -1 6.1 2 20                         51.0                         62.3                     -11.34 40                         74.0                         67.5                        6.49 70                         82.0                         73.3                        8.71 100                         85.0                         77.1                        7.93 150                         85.0                         80.4                        4.56 175                         80.0                         81.3                       -1.30 200                         79.0                         81.8                       -2.85 225                         780                          82.2                       -4.19 325                         80.0                         82.7                       -2.70 550                         82.0                         82.8                       -0.79 CVGraph 6.02                                          11/11/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-106 Capsule Y Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:38 PM A = 36.91 B= 35.91 C = 56.33 TO = -15.98 D = 0.00 Correlation Coefficient = 0.977 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 72.82 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-18.90° F Pla nt: Seabrnok 1 Material: SA533B1 Heat: D 1136-2 O rientation: NA Capsule : Y 

   ,-.. 60
  *--9 rll
   -==      50
  *=-r ll
     ~

Q. 40 

     ~
   ~
     ~      30 QJ
     ~
   ~

20 ol::::::::::c:::::+/-:::=!:_L_...L..-...l...---1.~L-...L..-...l...---1.~L-...i...._...L---1..~L-...1...-~ 

               -300      -200       -100            0            100          200           300          400 500          600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-107 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Y Capsule Y Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -80                          7.0                          7.7                       -0.71
                  -40                         220                          22.5                       -0.46
                  -25                         30.0                         31.2                       -1.21 0                         46.0                         46.8                       -0.83 25                         68.0                         59.2                        8.77 50                         66.0                         66.5                       -0.52 68                         59.0                         69.4                     -1 0.35 72                         67.0                         69.8                       -2.79 100                         68.0                         71.7                       -3.67 125                         69.0                         72.3                       -3.34 175                         76.0                         72.7                        3.26 200                         79.0                         72.8                        6.22 200                         75.0                         72.8                        2.22 250                         70.0                         72.8                       -2.81 300                         780                          72.8                        5.1 8 CVGraph 6.02                                          11111/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-108 Capsule V Heat Affected Zone CVGraph 6.02: Hy pe rbolic Ta ngent Curve Printed on I Ill 1/2020 12:44 PM A= 39.31B=38.31C=86.25 TO= -19.63 D = 0.00 Correlation Coefficient = 0 .943 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E. = 77.62 L ower Shelf L.E. = 1.00 (Fixed)

Temp@35 mils=-29.30° F Plant: Seabrnok 1 Mate rial: SA533B1 Heat: D1136-2 Orientation : NA Capsule : V 

  *--9 rll
   -==     601----'---+~~---+-~~~R-~-+-~~+-~--+~-'----+-~~-+-----'----I
   *;; so       ~~~~i--~~--t~~~__,,o--~~--~~~-+-~~~--~~~--~~~--~~~
    =~

Q. 

     ~     40   ~~~-+~~~-t-~~+-t~~~-+-~~~t--~~-+-~~~+-~~-+~~~~
   ~
   ~
   ~
    -~
     ~

30 t--~~~f--~~----1~~+---+~~~--+~~~-+-~~~-+-~~~-+-~~~-+-~~---1 ol:::::=::::r::::::r::..__,_~L_...L..-...l...--'-~L-...L..-...l...--'-~L-...i...._...L---1..~L-...1...-~ 

              -300      -200        -100           0            100          200            300          400 500         600 Temperature(° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-109 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: V Capsule V Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -90                         28.0                         13.5                       14.47
                  -75                         15.0                         17.6                       -2.62
                  -50                         25.0                         26.4                       -135
                  -25                         270                          36.9                       -9.93 0                         45.0                         47.9                       -2.88 25                         60.0                         57.5                        2.47 25                         67.0                         57.5                        9.47 50                         53.0                         64.9                     -11.90 75                         81.0                         69.9                       1106 100                         79.0                         73.1                        5.88 125                         79.0                         75.0                        3.97 150                         68.0                         76.1                       -8.15 200                         70.0                         77.2                       -7.1 5 250                         79.0                         77.5                        1.53 300                         780                          77.6                        0.43 CVGraph 6.02                                          11/11/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-110 Capsule X Heat Affected Zone CVGrnph 6 .02: Hyperbolic Tangent Curve Printed on 12/8/20 20 5:48 PM A = 37.50 B = 36.50 C = 72.45 TO = 11.07 D = 0.00 Correlation Coefficient = 0 .975 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf L.E = 74 .00 (Fixed) Lower Shelf L.E = 1.00 (Fixed)

Temp@35 mils= 6 .10° F Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: NA Capsule: X 

   ,-.. 60
  *--9 rll
   -==     50
  *=-r ll
     ~

Q. 40 

     ~
   ~
     ~     30 QJ
     ~
   ~

20 ol:::::::::::c:=::::::t:::::::i::.._L_...L..-...l...---1.~L-...L..-...l...---1.~L-...i...._...L---1..~L-...1...-~ 

              -300       -200         -100           0            100          200          300          400   500          600 Temperature(° F)

CVGraph 6.02 12/08/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-111 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: X Capsule X Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input L. E. Computed L. E. Differential 

                  -25                         21.0                         20.7                        0.31 0                        33.0                         32.0                        1.04 25                         38.0                         44.4                       -6.43 100                         75.0                         68.2                        6.77 130                         74.0                         71.4                        2.64
                  -50                         15.0                         12.4                        2.59
                  -1 5                        26.0                         24.9                        11 0 15                         44.0                         39.5                        4.52 90                         76.0                         66.6                        9.42
                  -10                         30.5                         27.2                        3.33
                  -30                         22.5                         18.8                        3.73 60                         57.0                         59.0                       -1.98
                  -20                         18.5                         22.7                       -4.24
                    -5                        27.5                         29.5                       -2.03 40                         43.5                         51.3                       -7.85 CVGraph 6 .02                                         12/08/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-112 Unirradiated Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:27 PM A = 50.00 B = 50.00 C = 127.83 TO = -102.20 D = 0.00 Correlation Coefficient = 0 .925 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature al 50% Shear = -102.10 Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: Uni rrad 100 -- c:.--- - -- 

                                                             /
                 ~

() 90 

                 ~

I 

                                                        /                                                         .

80 ' w 70 I  : l- 

    ~       60
                 ~
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    ~            -                 _/                                                                             .

l-QJ p.. 40 30 

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20 

                              'O                              .
                 ~
                          /c  ~

10 0 v 

              -300         -200        -100            0           100           200          300        400        500        600 Temperature {° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-113 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Unirrad Unirradiated Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -200                         130                         17.8                       -4.80
                  -200                         130                         17.8                       -4.80
                  -175                         23.0                        24.3                       -125
                  -175                         18.0                        24.3                       -6.25
                  -175                         30.0                        24.3                        5.75
                  -150                         370                         32.1                        4.87
                  -150                         40.0                        32.1                        7.87
                  -150                         54.0                        32.1                       21.87
                  -100                         29.0                        50.9                     -21.86
                  -100                         38.0                        50.9                     -1 2.86
                  -100                         79.0                        50.9                       28.1 4
                   -60                         55.0                        65.9                     -10.93
                   -60                         37.0                        65.9                     -28.93
                   -60                         67.0                        65.9                        1 07 0                        920                         83.2                        8.81 0                        920                         83.2                        8.81 40                        100.0                        90.2                        9.75 40                        1000                         90.2                        9.75 110                        1000                         96.5                        3.49 110                        1000                         96.5                        3.49 11 0                       100.0                        96.5                        3.49 250                        100.0                        99.6                        0.40 CVGraph 6.02                                          11/11/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-114 Capsule U Heat Afected Zone CVGraph 6.02: Hy perbolic Tangent Curve Printed on I Ill 1/2020 12:33 PM A = 50.00 B = 50.00 C = 113.01 TO = -57.88 D = 0.00 Correlation Coefficient = 0 .917 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf %Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature al 50% Shear = -57.80 Plant: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule : U 100 -- -- -- - -- -- 

                 ~
                                                                  /

v-- 90 80 

                 ~
                        '                                 II                                                      .

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    ~       60
                 ~
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                                                                                                                  ~

20 . 10 

                 ~

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              -300        -200        -100           0              100          200          300        400        500         600 Temperature {° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-115 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: U Capsule U Heat Afected Zone Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -80                          45.0                        40.3                        4.66
                  -40                          60.0                        57.8                        2.1 6
                  -40                          60.0                        57.8                        2. 16
                  -20                          70.0                        66.2                        3.84 0                          50.0                        73.6                     -23.58 20                          70.0                        79.9                       -9.87 40                        100.0                         85.0                       15.03 70                        100.0                         90.6                        94 2 100                        1000                          94.2                        5.76 150                        1000                          97.5                        246 175                         100.0                        984                         1.60 200                         100.0                        99.0                        1.03 225                         100.0                        99.3                        0.67 325                         1000                         99.9                        0.11 550                         1000                        1000                         0 00 CVGraph 6.02                                          1111112020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-116 Capsule Y Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:39 PM A = 50.00 B = 50.00 C = 71.89 TO = -34.30 D = 0.00 Correlation Coefficient = 0 .985 Equation is A + B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature al 50% Shear = -34.20 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D 1136-2 O rientation: NA Capsule : Y 100 

                  ~

90 80 

                  ~

7_- ...... 

                  ..                                  I 70          :

l- 

    ~        60
                  ~
                        .                         J           .                                                     .

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                  -      .                     7                                                                    .

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                        ..                    I               .                                                     :

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                                                                                                                    ~

20 . 

                  ~

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               -300        -200        -100          0              100           200          300         400        500         600 Temperature {° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-117 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: Y Capsule Y Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -80                          15.0                        21.9                       -6.90
                  -40                          50.0                        46.0                        3.96
                  -25                          60.0                        56.4                        3.57 0                          70.0                        72.2                       -2.20 25                          90.0                        83.9                        6.11 50                          80.0                        91.3                     -11.26 68                          90.0                        94.5                       -4.51 72                          95.0                        95.1                       -0.06 100                        1000                          97.7                        2.33 125                        1000                          98.8                        11 8 175                         100.0                        99.7                        0.30 200                         100.0                        99.9                        0.1 5 200                         100.0                        99.9                        0.1 5 250                         1000                        1000                         0.04 300                         1000                        1000                         0 01 CVGraph 6.02                                          11111/2020                                             Page 212 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-118 Capsule V Heat Affected Zone CVGraph 6.02: Hyperbolic Tangent Curve Printed on I Ill 1/2020 12:45 PM A = 50.00 B = 50.00 C = 68.59 TO = -15.88 D = 0.00 Correlation Coefficient = 0 .992 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature al 50% Shear= -15.80 Pla nt: Seabrnok 1 Material: SA533B1 Heat: D1136-2 Orientation: NA Capsule: V 100 

                                                               -- V""--                --

90 

                  ~
                                                              /

80 

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                                          }

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               -300        -200        -100          0           100           200          300         400       500        600 Temperature {° F)

CVGraph 6.02 11/11/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-119 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: V Capsule V Heat Affected Zone Charpy V-Notch Data Temperature (0 F) Input %Shear Computed %Shear Differential 

                  -90                          10.0                        10.3                       -0.33
                  -75                          20.0                        15.1                        4.86
                  -50                          25.0                        270                        -1.99
                  -25                          45.0                        43.4                        1.61 0                          55.0                        61.4                       -6.37 25                          85.0                        76.7                        8.29 25                          75.0                        76.7                       -1.71 50                          80.0                        87.2                       -7.23 75                        1000                          93.4                        6.60 100                        1000                          96.7                        3.30 125                         100.0                        98.4                        1.62 150                         100.0                        99.2                        0.79 200                         100.0                        99.8                        0.1 8 250                         1000                        1000                         0.04 300                         1000                        1000                         0 01 CVGraph 6.02                                          11/11/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-120 Capsule X Heat Affected Zone CVGraph 6 .02: Hyperbolic Tangent Curve Printed on 12/3/20204: 16 PM A = 50.00 B = 50.00 C = 98.95 TO = 11.62 D = 0.00 Correlation Coefficient = 0 .968 Equation is A+ B

  • ITanh((T-TO)/(C+DT)) I Upper Shelf%Shear = 100.00 (Fixed) Lower Shelf %Shear = 0.00 (Fixed)

Temperature at 50% Shear= 11.70 Plant: Seabrnok 1 Material: SA53381 Heat: D1136-2 Orientation: NA Capsule: X 

                                                                         /( --

100 

                 ~

90 

                 ~

l . 80 70 1-l- 

    ~       60
                 ~

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                 -                            F               .

10 

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              -300        -200        -100             0           100           200          300        400        500        600 Temperature {° F)

CVGraph 6.02 12/03/2020 Page 112 WCAP-18607-NP March 2021 Revision 0 

  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 C-121 Plant: Seabrook 1 Material: SA533Bl Heat: D1136-2 Orientation: NA Capsule: X Capsule X Heat Affected Zone Charpy V-Notch Data Temperature {° F) Input %Shear Computed %Shear Differential 

                  -25                          30.0                        32.3                       -2.30 0                         50.0                        44.2                        5.84 25                          60.0                        56.7                        3.28 100                          85.0                        85.6                       -0.65 130                         1000                         91.6                        8.37
                  -50                          25.0                        22.3                        2.65
                  -1 5                         45.0                        36.9                        8.1 4 15                          50.0                        51.7                       -1.71 90                          80.0                        83.0                       -2.98
                  -1 0                         30.0                        39.2                       -9.25
                  -30                          30.0                        30.1                       -0.13 60                          70.0                        72.7                       -2.67
                  -20                          25.0                        34.5                       -9.55
                    -5                         50.0                        41.7                        8.32 40                          60.0                        64.0                       -3.96 CVGraph 6.02                                          12/03/2020                                             Page 2/2 WCAP-18607-NP                                                                                                         March 2021 Revision 0
  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-1 APPENDIX D SEABROOK UNIT 1 SURVEILLANCE PROGRAM CREDIBILITY EVALUATION INTRODUCTION Regulatory Guide 1.99, Revision 2 [D-1] describes general procedures acceptable to the NRC staff for calculating the effects of neutron radiation embrittlement of the low-alloy steels currently used for light-water-cooled reactor vessels. Positions 2.1 and 2.2 of Regulatory Guide 1.99, Revision 2, describe the method for calculating the adjusted reference temperature and Charpy upper-shelf energy of reactor vessel beltline materials using surveillance capsule data. The methods of Positions 2.1 and 2.2 can only be applied when two or more surveillance data sets become available from the reactor in question. To date, there have been four surveillance capsules removed from the Seabrook Unit 1 reactor vessel. To use these surveillance data sets, the credibility must be determined. In accordance with Regulatory Guide 1.99, Revision 2, the credibility of the surveillance data will be judged based on five criteria. The following subsections evaluate each of these five criteria for Seabrook Unit 1 in order to determine the credibility of the surveillance data for use in neutron radiation embrittlement calculations. EVALUATION Criterion 1: Materials in the capsules should be those judged most likely to be controlling with regard to radiation embrittlement. The beltline region of the reactor vessel is defined in Appendix G to 10 CFR Part 50, Fracture Toughness Requirements [D-2], as follows: the region of the reactor vessel (shell material including welds, heat affected zones, and plates or forgings) that directly surrounds the effective height of the active core and adjacent regions of the reactor vessel that are predicted to experience sufficient neutron radiation damage to be considered in the selection of the most limiting material with regard to radiation damage. The Seabrook Unit 1 reactor vessel consists of the following materials which would have been considered in the beltline at the time of the development of the surveillance program: Intermediate Shell Plates R1806-1, -2, -3 Lower Shell Plates R1808-1, -2, -3 Intermediate Shell Longitudinal (axial) Weld Seams 101-124 A, B, C (Heat # 4P6052, Flux Type 0091, Flux Lot # 0145) Lower Shell Longitudinal (axial) Weld Seams 101-142 A, B, C (Heat # 4P6052, Flux Type 0091, Flux Lot # 0145) Intermediate to Lower Shell Girth Weld Seam 101-171 (Heat # 4P6052, Flux Type 0091, Flux Lot # 0145) Per [D-3], the Seabrook Unit 1 selection of surveillance material was based on an evaluation of initial toughness (characterized by the reference temperature, RTNDT, and Cv upper shelf energies), and the WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-2 predicted effect of chemical composition (residual copper and phosphorus) and neutron fluence on the toughness (RTNDT shift) during reactor operation. Lower shell plate numbered R1808-3 was selected as the surveillance base metal since it had the highest adjusted EOL RTNDT of the six beltline region plates. Weld Heat # 4P6052 was selected because it is the same heat used in fabrication of all of the longitudinal and girth beltline welds. Based on the previous discussion, Criterion 1 is met for the Seabrook Unit 1 surveillance program. Criterion 2: Scatter in the plots of Charpy energy versus temperature for the irradiated and unirradiated conditions should be small enough to permit the determination of the 30 ft-lb temperature and upper-shelf energy unambiguously. Based on engineering judgment, the scatter in the data presented in these plots, as documented in Section 5 and Appendix C, is small enough to permit the determination of the 30 ft-lb temperature and the upper-shelf energy of the Seabrook Unit 1 surveillance materials unambiguously. Hence, the Seabrook Unit 1 surveillance program meets Criterion 2. Criterion 3: When there are two or more sets of surveillance data from one reactor, the scatter of RTNDT values about a best-fit line drawn as described in Regulatory Position 2.1 normally should be less than 28°F for welds and 17°F for base metal. Even if the fluence range is large (two or more orders of magnitude), the scatter should not exceed twice those values. Even if the data fail this criterion for use in shift calculations, they may be credible for determining decrease in upper-shelf energy if the upper shelf can be clearly determined, following the definition given in ASTM E185-82 [D-4]. The functional form of the least squares method as described in Regulatory Position 2.1 will be utilized to determine a best-fit line for this data and to determine if the scatter of these RTNDT values about this line is less than 28°F for welds and less than 17°F for the plate. Following is the calculation of the best-fit line as described in Regulatory Position 2.1 of Regulatory Guide 1.99, Revision 2. In addition, the recommended NRC methods for determining credibility will be followed. The NRC methods were presented to the industry at a meeting held by the NRC on February 12 and 13, 1998 [D-5]. At this meeting the NRC presented five cases. Of the five cases, Case 1 (Surveillance Data Available from Plant but No Other Sources) most closely represents the situation for the Seabrook Unit 1 Lower Shell Plate R1808-3 and weld material. Case 4 (Surveillance Data from Plant and Other Sources) also applies to the surveillance weld material and is also considered herein. WCAP-18607-NP March 2021 Revision 0 

*** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-3 Evaluation of Data from Seabrook Unit 1 Only (Case 1) In accordance with the NRC Case 1 guidelines, the data from Seabrook Unit 1 only will be evaluated. Note that when evaluating the credibility of the surveillance weld data, the measured RTNDT values for the surveillance weld do not include the adjustment ratio procedure of Regulatory Guide 1.99, Rev. 2, Position 2.1, since this calculation is based on the actual surveillance weld measured shift values. In addition, only Seabrook Unit 1 is being considered; therefore, no temperature adjustment is required. Table D-1 contains the calculation of chemistry factors for the Seabrook Unit 1 reactor vessel beltline materials contained in the surveillance program. Table D-1 Calculation of Interim Chemistry Factors for the Credibility Evaluation Using Seabrook Unit 1 Surveillance Data Only Capsule Fluence(1) RTNDT(3) FF*RTNDT Material Capsule (x 1019 n/cm2, FF(2) FF2 (°F) (°F) E > 1.0 MeV) U 0.311 0.680 39.7 27.0 0.462 Lower Shell Plate Y 1.30 1.073 47.2 50.6 1.151 R1808-3 (Longitudinal) V 2.66 1.262 60.4 76.2 1.592 X 6.03 1.437 72.5 104.2 2.066 U 0.311 0.680 28.8 19.6 0.462 Lower Shell Plate Y 1.30 1.073 34.9 37.4 1.151 R1808-3 (Transverse) V 2.66 1.262 61.3 77.3 1.592 X 6.03 1.437 100.8 144.9 2.066 SUM: 537.3 10.542 CF R1808-3 = (FF

  • RTNDT) ÷ (FF ) = (537.3) ÷ (10.542) = 51.0°F 2

U 0.311 0.680 25.4 17.3 0.462 Seabrook Unit 1 Y 1.30 1.073 24.3 26.1 1.151 Surveillance Weld (Heat # 4P6052) V 2.66 1.262 41.7 52.6 1.592 X 6.03 1.437 33.8 48.6 2.066 SUM: 144.5 5.271 CF Surv. Weld = (FF

  • RTNDT) ÷ (FF ) = (144.5) ÷ (5.271) = 27.4°F 2

Notes:

1. Fluence taken from Table 6-1.
2. FF = fluence factor = f(0.28 - 0.10*log (f)).
3. RTNDT taken from Table 5-10.

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   *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-4 The scatter of RTNDT values about the functional form of a best-fit line drawn as described in Regulatory Position 2.1 is presented in Table D-2. Table D-2 Best-Fit Evaluation For Seabrook Unit 1 Surveillance Materials Only 

                                                                                                                                     <17°F CF(1)            Capsule                  Measured    Predicted      Scatter (Base  Metal)

Material Capsule (Slopebest-fit) Fluence(2) FF(3) RTNDT(4) RTNDT(5) RTNDT(6) (°F) (x 1019 n/cm2) (°F) (°F) (°F) <28°F (Weld) U 0.311 0.680 39.7 34.7 5.0 YES Lower Shell Plate Y 1.30 1.073 47.2 54.7 7.5 YES R1808-3 (Longitudinal) V 2.66 1.262 60.4 64.3 3.9 YES X 6.03 1.437 72.5 73.3 0.8 YES 51.0 U 0.311 0.680 28.8 34.7 5.9 YES Lower Shell Plate Y 1.3 1.073 34.9 54.7 19.8 NO R1808-3 (Transverse) V 2.66 1.262 61.3 64.3 3.0 YES X 6.03 1.437 100.8 73.3 27.5 NO U 0.311 0.680 25.4 18.6 6.8 YES Surveillance Weld Y 1.30 1.073 24.3 29.4 5.1 YES 27.4 Metal V 2.66 1.262 41.7 34.6 7.1 YES X 6.03 1.437 33.8 39.4 5.6 YES Notes:

1. CF calculated in Table D-1.
2. Fluence taken from Table 6-1.
3. FF = fluence factor = f(0.28 - 0.10*log (f)).
4. Measured RTNDT taken from Table 5-10.
5. Predicted RTNDT = CF x FF.
6. Scatter RTNDT = Absolute Value [Predicted RTNDT - Adjusted RTNDT].

The scatter of RTNDT values about the best-fit line, drawn as described in Regulatory Guide 1.99, Rev. 2, Position 2.1 should be less than 17°F for base metal. From a statistical point of view, +/- 1 would be expected to encompass 68% of the data. Table D-2 indicates that six of the eight (75%) of surveillance data points fall within the +/- 1 of 17F scatter band for surveillance base metal materials; therefore, the Lower Shell Plate R1808-3 data is deemed credible per the third criterion. The scatter of RTNDT values about the best-fit line, drawn as described in Regulatory Guide 1.99, Rev. 2, Position 2.1 should be less than 28°F for weld metal. From a statistical point of view, +/- 1 would be expected to encompass 68% of the data. Table D-2 indicates that all four surveillance data points (100%) fall within the +/- 1 of 28F scatter band for surveillance weld materials; therefore, the weld material (Heat 

      # 4P6052) considering Seabrook Unit 1 data only is deemed credible per the third criterion.

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Westinghouse Non-Proprietary Class 3 D-5 Evaluation of Data from Seabrook Unit 1 and Other Sources (Case 4) In accordance with the NRC Case 4 guidelines, the data from Seabrook Unit 1 only was evaluated first (in the previous section) and determined to be credible. In this section, the credibility of the Heat # 4P6052 material will be determined when considering both the Seabrook Unit 1 and Millstone Unit 3 surveillance data. Note that when evaluating the credibility of the surveillance weld data, the measured RTNDT values are adjusted to the average chemical composition and average capsule irradiation temperature. Table D-3 provides the chemistry and temperature adjustment for Weld Heat # 4P6052 when considering the Seabrook Unit 1 and Millstone Unit 3 data. Table D-3 Mean Chemical Composition and Temperature for Weld Heat # 4P6052 Cu Ni Inlet Temperature during Temperature Plant Capsule Wt. % Wt. % Period of Irradiation (°F) Adjustment(°F) U 558 -1 Millstone Unit 3 X 0.038 0.06 558 -1 W 558 -1 U 559 0 Y 559 0 Seabrook Unit 1 0.047 0.049 V 559 0 X 559 0 MEAN 0.043 0.054 559 WCAP-18607-NP March 2021 Revision 0 

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Westinghouse Non-Proprietary Class 3 D-6 Table D-4 contains the calculation of chemistry factor for the Heat # 4P6052 material considering data from Seabrook Unit 1 and Millstone Unit 3 and applicable temperature and chemistry adjustments. Table D-4 Calculation of Interim Chemistry Factor for the Credibility Evaluation for Heat # 4P6052 using Data from Seabrook Unit 1 and Millstone Unit 3 Capsule Fluence(1) RTNDT(3) FF*RTNDT Plant Capsule (x 1019 n/cm2, FF(2) FF2 (°F) (°F) E > 1.0 MeV) 30.8 U 0.400 0.746 23.0 0.557 (30.6) 0.0 Millstone Unit 3 X 1.98 1.186 0.0 1.408 (-6.3) 0.0 W 3.16 1.303 0.0 1.698 (-1.3) 24.9 U 0.311 0.680 16.9 0.462 (25.4) 23.8 Y 1.3 1.073 25.6 1.151 (24.3) Seabrook Unit 1 40.9 V 2.66 1.262 51.6 1.592 (41.7) 33.1 X 6.03 1.437 47.6 2.066 (33.8) SUM: 164.6 8.933 CF 4P6052 = (FF

  • RTNDT) ÷ (FF ) = (164.6) ÷ (8.933) = 18.4°F 2

Notes:

1. Fluence taken from WCAP-16629-NP [D-6] for Millstone Unit 3 and Table 6-1 herein for Seabrook Unit 1.
2. FF = fluence factor = f(0.28 - 0.10*log (f)).
3. RTNDT taken from WCAP-16629-NP [D-6] for Millstone Unit 3 and Table 5-10 herein for Seabrook Unit 1. Values have been adjusted by the difference in temperature between the individual capsule and the average capsule inlet temperature (559°F) and then have been adjusted by the ratio of the average chemical composition CF (30.1°F) to CF of the individual capsule (28.9°F for Millstone Unit 3 and 30.7°F for Seabrook Unit 1). Unadjusted values are shown in parenthesis. Since RTNDT should physically not be negative, negative adjusted values are set to zero.

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  *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-7 The scatter of RTNDT values about the functional form of a best-fit line drawn as described in Regulatory Position 2.1 for Heat # 4P6052 considering data from all sources is presented in Table D-5. Table D-5 Best-Fit Evaluation For Heat # 4P6052 Considering Millstone Unit 3 and Seabrook Unit 1 Data CF(1) Capsule Measured Predicted Scatter 

                                                                                                                                    <28°F Plant              Capsule        (Slopebest-fit)       Fluence(2)     FF(3)      RTNDT(4)   RTNDT(5)     RTNDT(6)

(Weld) (°F) (x 1019 n/cm2) (°F) (°F) (°F) U 0.400 0.746 30.8 13.7 17.1 YES Millstone Unit 3 X 1.98 1.186 0.0 21.8 21.8 YES W 3.16 1.303 0.0 24.0 24.0 YES U 18.4 0.311 0.680 24.9 12.5 12.4 YES Y 1.30 1.073 23.8 19.7 4.1 YES Seabrook Unit 1 V 2.66 1.262 40.9 23.2 17.7 YES X 6.03 1.437 33.1 26.4 6.7 YES Notes:

1. CF calculated in Table D-4.
2. Fluence taken from Table D-4.
3. FF = fluence factor = f(0.28 - 0.10*log (f)).
4. Measured RTNDT taken from Table D-4.
5. Predicted RTNDT = CF x FF.
6. Scatter RTNDT = Absolute Value [Predicted RTNDT - Adjusted RTNDT].

The scatter of RTNDT values about the best-fit line, drawn as described in Regulatory Guide 1.99, Rev. 2, Position 2.1 should be less than 28°F for weld metal. From a statistical point of view, +/- 1 would be expected to encompass 68% of the data. Table D-5 indicates that all seven (100%) of the of surveillance data points fall within the +/- 1 of 28F scatter band for surveillance base metal materials; therefore, the Heat # 4P6052 weld material considering both Seabrook Unit 1 and Millstone Unit 3 data is deemed credible per the third criterion. Criterion 4: The irradiation temperature of the Charpy specimens in the capsule should match the vessel wall temperature at the cladding/base metal interface within +/- 25°F. The Seabrook Unit 1 capsule specimens are located in the reactor between the fuel and the vessel wall and are positioned opposite the center of the core. The test capsules are in baskets attached to the vessel wall. The location of the specimens with respect to the reactor vessel beltline ensures that the reactor vessel wall and the specimens experience equivalent operating conditions such that the temperatures will not differ by more than 25°F. Hence, Criterion 4 is met for the Seabrook Unit 1 surveillance program. WCAP-18607-NP March 2021 Revision 0 

      *** This record was final approved on 3/24/2021 3:48:35 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 D-8 Criterion 5: The surveillance data for the correlation monitor material in the capsule should fall within the scatter band of the database for that material. The Seabrook Unit 1 surveillance program does not contain correlation monitor material; therefore, this criterion is not applicable to the Seabrook Unit 1 surveillance program. Hence, this criterion is not applicable to the Seabrook Unit 1 surveillance program. CONCLUSION Based on the preceding responses to the five criteria of Regulatory Guide 1.99, Rev. 2, Section B, the Seabrook Unit 1 surveillance plate and weld data are deemed credible. REFERENCES D-1 U.S. Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, Regulatory Guide 1.99, Rev. 2, Radiation Embrittlement of Reactor Vessel Materials, May 1988. [ADAMS Accession Number ML003740284] D-2 Code of Federal Regulations 10 CFR 50, Appendix G, Fracture Toughness Requirements, U.S. Nuclear Regulatory Commission, Federal Register, November 29, 2019. D-3 Westinghouse Report WCAP-10110, Rev. 0, Public Service Company of New Hampshire Seabrook Station Unit No. 1 Reactor Vessel Radiation Surveillance Program, March 1983. D-4 ASTM E185-82, Standard Practice for Conducting Surveillance Tests for Light-Water Cooled Nuclear Power Reactor Vessels, American Society for Testing and Materials, 1982. D-5 K. Wichman, M. Mitchell, and A. Hiser, USNRC, Generic Letter 92-01 and RPV Integrity Workshop Handouts, NRC/Industry Workshop on RPV Integrity Issues, February 12, 1998. [ADAMS Accession Number ML110070570]. D-6 Westinghouse Report WCAP-16629-NP, Rev. 0, Analysis of Capsule W from the Dominion Nuclear Connecticut Millstone Unit 3 Reactor Vessel Radiation Surveillance Program, September 2006. WCAP-18607-NP March 2021 Revision 0 

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