PLA-8172, Relief Request 4RR-12 Regarding Fourth Ten-Year Inservice Inspection Interval Limited Examinations - PLA-8172

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Relief Request 4RR-12 Regarding Fourth Ten-Year Inservice Inspection Interval Limited Examinations - PLA-8172
ML25140A973
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 05/20/2025
From: Casulli E
Susquehanna, Talen Energy
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
PLA-8172
Download: ML25140A973 (1)
v • d • e


Text

{{#Wiki_filter:Edward Casulli Site Vice President Susquehanna Nuclear, LLC 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.3795 Fax 570.542.1504 Edward.Casulli@talenenergy.com TALEN~ May 20, 2025 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 SUSQUEHANNA STEAM ELECTRIC STATION RELIEF REQUEST 4RR-12 REGARDING FOURTH TEN-YEAR INSERVICE INSPECTION INTERVAL LIMITED EXAMINATIONS PLA-8172 ENERGY 10 CPR 50.55a Docket No. 50-387 and 50-388 In accordance with 10 CPR 50.55a, "Codes and standards," Paragraph (g)(5)(iii), Susquehanna Nuclear, LLC, (Susquehanna), requests NRC approval of the attached relief request associated with the fourth 10-Year Inservice Inspection (ISI) interval, hereafter referred to as the fourth ISI interval, for Susquehanna Steam Electric Station (SSES), Units 1 and 2. The SSES fourth ISI interval ended on May 31, 2024. Relief is requested due to the impracticality of satisfying the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," due to plant design. Specifically, conformance with certain ASME Section XI Class 1 and 2 weld requirements is impractical since conformance would require extensive structural modifications to the component or smTounding structure. Susquehaima has performed the ASME Section XI required examinations to the maximum extent practical, or best effort, as documented in the enclosures. Due to the physical interferences or component geometry, there are no alternative examination techniques currently available to increase exainination coverage. Susquehaima requests approval of the proposed relief by May 01, 2026. There ai*e no new or revised commitments contained in this submittal. Document Control Desk PLA-8172 Should you have any questions regarding this submittal, please contact Ms. Melisa Krick, Manager-Nuclear Regulatory Affairs, at (570) 542-1818. E. Casulli : Relief Request 4 RR-12 : Additional Details and Supporting Documentation Relative to SSES Unit 1 : Additional Details and Supporting Documentation Relative to SSES Unit 2 Copy: NRC Region I Ms. E. Brady, NRC Resident Inspector Ms. A. Klett, NRC Project Manager Mr. M. Shields, PA DEP/BRP

PLA-8172, Enclosure 1 Relief Request 4RR-12

PLA-8172, Enclosure 1 Page 1 of 6 10 CFR 50.55a Proposed Alternative 4RR-12, Revision 0 Proposed Alternative in Accordance with 10 CFR 50.55a(g)(5)(iii) -- Inservice Inspection Impracticality

1.

ASME Code Component(s) Affected Code Class: 1 and 2

References:

IWB-2500, Table IWB-2500-1, IWC-2500, Table IWC-2500-1 Examination Category: B-A, B-D, C-C Item Number: B1.12, B1.30, B1.40, B3.90, C3.30

== Description:== Limited Coverage Examinations Component Number: See Tables A and B for a list of Component IDs

2.

Applicable Code Edition The fourth ISI interval for SSES Units 1 and 2, which concluded on May 31, 2024, was based on the ASME Boiler and Pressure Vessel Code, Section XI, Rules for lnservice Inspection of Nuclear Power Plant Components, (ASME Section XI) 2007 Edition with the 2008 Addenda. ASME Section XI, Appendix VIII, Performance Demonstration for Ultrasonic Examination Systems, was implemented as required by 10 CFR 50.55a. Ultrasonic procedures and personnel were qualified to the Performance Demonstration Initiative (PDI) which satisfies the requirements of the 2007 Edition with 2008 Addenda of ASME Section XI, Appendix VIII, as modified by 10 CFR 50.55a. In the case of limited examinations, efforts were made to obtain additional examination coverage. Tables A and B identify ASME Section XI examinations where limited coverage was achieved. Enclosures 2 and 3 provide additional details and information supporting this request for SSES Units 1 and 2, respectively.

3.

Applicable Code Requirement

IWA-2200(c) requires that, All nondestructive examinations of the required examination surface or volume shall be conducted to the maximum extent practical. When performing VT-1, surface, radiographic, or ultrasonic examination on a component with defined surface or volume, essentially 100% of the required surface or volume shall be examined. Essentially 100% coverage is achieved when the applicable examination coverage is greater than 90%; however, in no case shall the examination be terminated when greater than 90% coverage is achieved, if additional coverage of the required examination surface or volume is practical. Table IWB-2500-1, Examination Category B-A, Item Number B1.12, requires a volumetric examination of the Reactor Pressure Vessel (RPV) shell longitudinal welds in

PLA-8172, Enclosure 1 Page 2 of 6 accordance with Figure IWB-2500-2. The extent of examination is essentially 100% of the required examination volume, as specified in IWA-2200(c). Table IWB-2500-1, Examination Category B-A, Item Number B1.30, requires a volumetric examination of the RPV shell-to-flange weld in accordance with Figure IWB-2500-4. The extent of examination is essentially 100% of the required examination volume, as specified in IWA-2200(c). Table IWB-2500-1, Examination Category B-A, Item Number B1.40, requires a volumetric and surface examination of the RPV head-to-flange weld in accordance with Figure IWB-2500-5. The extent of examination is essentially 100% of the required examination volume and surface, as specified in IWA-2200(c). Table IWB-2500-1, Examination Category B-D, Item Number B3.90, requires a volumetric examination of the RPV nozzle-to-vessel welds in accordance with Figure IWB-2500-7. The extent of examination is essentially 100% of the required examination volume, as specified in IWA-2200(c). Table IWC-2500-1, Examination Category C-C, Item Number C3.30, requires a surface examination of the pump welded attachments in accordance with Figure IWC-2500-5. The extent of examination is essentially 100% of the length of the attachment weld, as specified in IWA-2200(c).

4.

Reason for Request

Impracticality of Compliance In accordance with 10 CFR 50.55a(g)(5)(iii), relief is requested on the basis that conformance with these ASME Section XI requirements is impractical since conformance would require extensive structural modifications to the component or surrounding structure. Due to the original design of these components, Susquehanna is unable to satisfy the ASME Section XI requirements to perform a surface or volumetric examination to the extent required for welds and welded attachments (greater than 90% of the required examination volume or area) identified in Tables A and B due to physical component configuration, interference from permanent plant equipment, single-sided access, etc. SSES Units 1 and 2 would incur significant engineering, material, and installation costs to perform such modifications. Therefore, relief is requested on the basis that the ASME Section XI requirements to examine these components are impractical. Tables A and B provide a cumulative listing of the limited ASME Section XI examinations performed during the fourth ISI interval for which relief is requested. These tables also indicate the outage the component was examined, the coverage percentage obtained for each component, and other pertinent design information. Enclosures 2 and 3 provide

PLA-8172, Enclosure 1 Page 3 of 6 coverage plots, for Units 1 and 2 respectively, which were extracted from the non-destructive examination summary sheets that detail the examination limitations. Based on the above explanation, Susquehanna requests relief from ASME Section XI Paragraph IWA-2200(c) that requires at least 90% coverage for volumetric and surface examinations for the items included in this request, based on the position that compliance with the required examination coverage is impractical. Burden Caused by Compliance Compliance with the applicable ASME Section XI volumetric and surface examination requirements can only be accomplished by redesigning and refabricating the subject and/or surrounding components. Based on this, the ASME Section XI requirements are deemed impractical in accordance with 10 CFR 50.55a(g)(5)(iii).

5.

Proposed Alternative and Basis for Use Susquehanna has performed the ASME Section XI required examinations to the maximum extent practical (Code Coverage), or best effort, which are documented in Tables A and B. Due to the physical interferences or component geometry, there are no alternative examination techniques currently available to increase examination coverage. There were no cases in any of the listed examinations where the components outside diameter surface features (i.e., weld crowns, weld shrinkage, surface roughness) could have been conditioned to obtain the required coverage without major modification to the components. During the fourth ISI interval, periodic system pressure tests that include VT-2 visual examinations were performed in accordance with ASME Section XI, Table IWB-2500-1, Examination Category B-P for Class 1 pressure retaining welds and components during each refueling outage, and Table IWC-2500-1, Examination Category C-H for Class 2 pressure retaining welds and components during each inspection period. These periodic system pressure tests and VT-2 examinations provide additional assurance that the structural and leak-tight integrity of the subject components was maintained throughout the fourth ISI interval. Volumetric and/or surface examinations were performed to the maximum extent practicable on components in this request, as required by the ASME Section XI ISI Program.

6.

Duration of Proposed Alternative Relief is requested for the fourth ISI interval for SSES Units 1 and 2 which began June 01, 2014 and ended May 31, 2024.

PLA-8172, Enclosure 1 Page 4 of 6

7.

Precedent The NRC has previously granted similar relief for the SSES third 10-Year ISI interval via Reference 7.1. Additionally, the following similar end of interval impracticality relief requests for Boiling Water Reactors were recently authorized by the NRC. 7.1 Susquehanna Steam Electric Station, Units 1 and 2 - Relief Requests for the Third 10-Year Inservice Inspection Interval, dated May 10, 2016 (ADAMS Accession No. ML16069A199). 7.2 Quad Cities Nuclear Power Station, Units 1 and 2 - Relief Request 15R-26, Revision 0, dated May 02, 2024 (ADAMS Accession No. ML24109A066). 7.3 Dresden Nuclear Power Station, Units 2 and 3 - Relief Request Regarding Examination Coverage for the Fifth Inservice Inspection Interval, dated September 26, 2024 (ADAMS Accession No. ML24225A213). 7.4 Monticello Nuclear Generating Plant, Unit No. 1 - Relief Request RR-017, Inservice Inspection Impracticality During the Fifth 10-Year Interval, dated November 21, 2024 (ADAMS Accession No. ML24323A214).

PLA-8172, Enclosure 1 Page 5 of 6 Table A Susquehanna Steam Electric Station, Unit 1 List of Components with Limited Coverage Examination (Page 1 of 1) Component ID Weld Description Exam Requirements Figure No. and Method Class / Exam Category / Item Number Refuel and Inspection Outage (RIO) Examined Material of Construction Diameter / Thickness (inches) Exam Angle / Frequency (MHz) / Mode Actual Coverage Appendix VIII Qualified Exam Remarks N4A Feedwater Nozzle-to-Vessel Weld on RPV IWB-2500-7 Volumetric (UT) 1 B-D B3.90 19RIO SA-508 Cl. 2/ SA-533 Gr. B Cl. 1 6.4375 Thickness 60°/3.0/Long 55°/1.0/Shear 70°/1.0/Shear 86.3% Yes The examination was limited due to the weld build up area for the N11A Nozzle. No recordable indications were detected. Reference Enclosure 2, Pages 1 - 3. N4D Feedwater Nozzle-to-Vessel Weld on RPV IWB-2500-7 Volumetric (UT) 1 B-D B3.90 19RIO SA-508 Cl. 2/ SA-533 Gr. B Cl. 1 6.4375 Thickness 60°/3.0/Long 55°/1.0/Shear 70°/1.0/Shear 86.3% Yes The examination was limited due to the weld build up area for the N11B Nozzle. No recordable indications were detected. Reference Enclosure 2, Pages 1 - 3. AG (0-360) RPV Head-to-Flange Weld IWB-2500-5 Volumetric (UT) 1 B-A B1.40 22RIO SA-533 Gr. B Cl. 1 5.218 Thickness 60°/2.0/Long 78.6% Yes The examination was limited due to the component configuration. No recordable indications were detected. The surface examination achieved 100% coverage and no recordable indications were detected. Reference Enclosure 2, Pages 4 - 6. 1P203-HW-2 RCIC Pump Mounting Foot IWC-2500-5 Surface (PT) 2 C-C C3.30 22RIO ASTM A216 Gr. WCA 36 Length N/A 83.3% N/A The examination was limited due to the Reactor Core Isolation Cooling (RCIC) Pump configuration. No recordable indications were detected. Reference Enclosure 2, Pages 7 - 8. BK & BM RPV Longitudinal Weld IWB-2500-2 Volumetric (UT) 1 B-A B1.12 23RIO SA-533 Gr. B Cl. 1 6.4375 Thickness Automated UT Zone 1: 60° to 85° beam angles Zone 2: 35° to 65° beam angles 81.4% Yes The examination was limited due to an insulation support ring at the top of the bioshield. An attempt was made which resulted in no additional coverage achieved below the insulation support ring. No recordable indications were detected. Reference Enclosure 2, Pages 9 - 18. AF (0-360) Shell RPV Shell-to-Flange Weld IWB-2500-4 Volumetric (UT) 1 B-A B1.30 23RIO SA-533 Gr. B Cl. 1 7.25 Thickness 60°/2.0/Long 74% Yes The examination was limited due to the component configuration. No recordable indications were detected. Reference Enclosure 2, Pages 19 - 21.

PLA-8172, Enclosure 1 Page 6 of 6 Table B Susquehanna Steam Electric Station, Unit 2 List of Components with Limited Coverage Examination (Page 1 of 1) Component ID Weld Description (System) Exam Requirements Figure No. and Method Class / Exam Category / Item Number RIO Examined Material of Construction Diameter / Thickness (inches) Exam Angle / Frequency (MHz) / Mode Actual Coverage Appendix VIII Qualified Exam Remarks BK RPV Longitudinal Weld IWB-2500-2 Volumetric (UT) 1 B-A B1.12 21RIO SA-533 Gr. B Cl. 1 6.4375 Thickness Automated UT 45° shear wave 60° longitudinal wave 70° longitudinal wave 72.1% Yes The examination was limited due to an insulation support ring at the top of the bioshield. An attempt was made which resulted in no additional coverage achieved below the insulation support ring. No recordable indications were detected. Reference Enclosure 3, Pages 1 - 5. BM RPV Longitudinal Weld IWB-2500-2 Volumetric (UT) 1 B-A B1.12 21RIO SA-533 Gr. B Cl. 1 6.4375 Thickness Automated UT 45° shear wave 60° longitudinal wave 70° longitudinal wave 70.1% Yes The examination was limited due to an insulation support ring at the top of the bioshield. An attempt was made which resulted in no additional coverage achieved below the insulation support ring. No recordable indications were detected. Reference Enclosure 3, Pages 6 - 10. AF (0-360) Shell RPV Shell-to-Flange Weld IWB-2500-4 Volumetric (UT) 1 B-A B1.30 21RIO SA-533 Gr. B Cl. 1 6.520 Thickness 60°/2.0/Long 74% Yes The examination was limited due to the component configuration. No recordable indications were detected. Reference Enclosure 3, Pages 11 - 12. AG (0-360) RPV Head-to-Flange Weld IWB-2500-5 Volumetric (UT) 1 B-A B1.40 21RIO SA-533 Gr. B Cl. 1 5.218 Thickness 60°/2.0/Long 79.7% Yes The examination was limited due to the component configuration. No recordable indications were detected. The surface examination achieved greater than 90% coverage and no recordable indications were detected. Reference Enclosure 3, Pages 13 - 14.

PLA-8172, Enclosure 2 Additional Details and Supporting Documentation Relative to SSES Unit 1

N4A & N4D (Feedwater Nozzle-to-Vessel Weld on RPV)-19RIO Susquehanna N4 Feedwater Nozzle S6 NS Exam Volume= 3.4 Sq. In. S6 FV Exam Volume= 14.8 Sq. In. S4 Inner 15%T Exam Volume= 3.2 Sq. In. 60° NS T-Scan achieved= 3.0 Sq. In. 60° FVT-Scan achieved= 14.8 Sq. ln. 60° Inner 15%TT-Scan achieved= 3.2 Sq. In. 60°T 60°T I I PLA-8172, Enclosure 2 Page 1 of21

N4A & N4D (Feedwater Nozzle-to-Vessel Weld on RPV)-19RIO (Continued) Supplement 6 volume and Inner 15% area scan limited due to the Nl 1 weld build-up. ( cross-hatched area typical-two (2) places) PLA-8172, Enclosure 2 Page 2 of21 N4A & D have typical scanning restrictions. Nl 1 instrumentation nozzle restrict the area for the nozzle to shell examination with respect to the Supplement 6 area and the Inner 15% area. The nozzle to shell weld is limited by the general design of the nozzle verses the examination volume. The aggregate coverage is 96%. Of that 96%, an additional 9. 7% is lost due to the Nl 1 Weld Build Pad (35°/360° x 100). Therefore, the final coverage is determined to be 86.3% N4 ter Nozzle(s) --(Ty places A & D)

N4A & N4D (Feedwater Nozzle-to-Vessel Weld on RPV)-19RlO (Continued) Examination Results: PLA-8172, Enclosure 2 Page 3 of21 This component was in accordance with ASME Section XI, 2007 Edition with the 2008 Addenda, Appendix VIII as modified by the PDI program description for execution of this examination. Manual transverse scans were performed. Manual scanning was restricted in the area of the Nl 1 Instrument Nozzle. The welded pad which the Nl 1 Nozzles protrudes from, prevented the coupling of the ultrasonic search unit in such a way which prevented the examination in that local area. Reduced scanning area resulted in an aggregate coverage of 86.3%. The manual exams recorded no indications. Previous data was reviewed with no significant changes.

AG (0-360) (RPV Head-to-Flange Weld)-22RIO Susquehanna AG - RPV Top Head to Flange Weld 60" NS Exam VdUme = 9.4 Sq. In. eo* FV exam Volume= 29.6 Sq. In. 50* NS T-SCSn achieved* 6.1 sci. In. 60° FV T*Scan achiev&d,. 29.5 Sq. In. 60° NS P-Scan achieved = 5.1 Sq. In. 60° FV P-Scan achieved = 20.6 Sq. In. I------ 15.0 ----- 8 "T FV I D 5.5"--j 4.s* 60 N~ ft. 60"T/P I ~+p i PLA-8172, Enclosure 2 Page 4 of21

AG (0-360) (RPV Head-to-Flange Weld)-22RIO (Continued) Weld Length = 360. Exam Volume=

39.

so* T-Scan 1S4 UC A so* T-Scan S6 FV A 60' T-scan S6 NS A 60° P-Scan S4 UC A 6D" P-Scan S6 FV A 60" P-Scan (S6 NS) A S0'T-Scan S4 UC) 60' T-Scan (S6 FVI 60' T-Scan (S6 NS s.o* P-Scan (S4 UC) 6D' P-Scan (S6 FV) 60' P-Scan (S6 NS) so* T-Scan S4 uci 60" T-Scan fS6 FV) 60" T-Scan fS6 NS1 60" P-Scan fS4 UC) so* P-Scan (S6 FV Susquehanna 1 / R22 Wefd AG Flange to Top Head Spring I 2022 CODE CROSS-SECTIONAL AREA TOTAL 1,,ODE COVERAGE Required Exam Area Sq. In. 0.0 29.6 9.4 0.0 29.6 9.4 AmaSeanned Manual 0.0 29.5 6.1 0.0 20.6 5.1 Percent ofAroa Manual 0.0% 75.6% 15.6% 0.0% 52.8% 13.1% Weld Length Manual 360 360 360 360 360 360 % Total Composite Covera-ge = Comments: A - Manual UT scans were restricted due to the flange configuration. Percent Manual 0.0% 37.8% 7.8% 0.0% 26.4% 6.5% 78.6% Note - Rounding methods may affect calculated values. UC-Underclad, FV-Full volume, NS-Near Surface. Weld length in inches or degrees. PLA-8172, Enclosure 2 Page 5 of21

AG (0-360) (RPV Head-to-Flange Weld)-22RIO (Continued) Examination Results: PLA-8172, Enclosure 2 Page 6 of21 During the manual ultrasonic examination of weld AG, no recordable indications were detected during a 60° Refracted Longitudinal search unit. This examination meets the requirements of AS:ME Section XI, 2007 Edition with the 2008 Addenda. Examination is limited due to the RPV head-to-flange configuration. 78.6% coverage was achieved. Previous data was reviewed with no significant changes.

1P203-HW-2 (RCIC Pump Mounting Foot)-22RIO I - Total length of component weld: 36 inches Limited area of 6 inches due to pump configuration Total area of coverage achieved is 83.3% 30 inches /36 inches x 100=83.3% PLA-81 72, Enclosure 2 Page 7 of21

1P203-HW-2 (RCIC Pump Mounting Foot) - 22RIO (Continued) PLA-8172, Enclosure 2 Page 8 of 21

BK (RPV Longitudinal Weld) - 23Rl0 LOl BK ROl Ul vJ z -..J I ,J:::-- l Ul 77 0 Reactor Pressure Vessel Coverage Plots g L03 LOZ R03 R02 Scanned Patches CT) N vJ Ul 0 PLA-8172, Enclosure 2 Page 9 of21

BK (RPV Longitudinal Weld)-23RIO (Continued) PLA-8172, Enclosure 2 Page 10 of21 Reactor Pressure Vessel Coverage Plots 4S"T 60°T P-Scans I ---7 I I I 1----

1 I

I L _____________ ScannerMotion _____ _J 16.0" Left Side Scans -8.0" References Searn Oetclls lshelll-Weld deton

  1. 4 Shell Ring Assembly - Rcdlus. shell ordered thickness & dad nonmlnal Left Side Scans - Normal and Reversed Susquehanna Unit-1 Weld BK - SC4 Long.

Zone 1 S6 Exam Volume= 27.5 Sq. In. Zone 2 S6 Exam Volume= 22.2 Sq. In. Zone 2 S4 Exam Volume= 8.6 Sq. In. ZlS6 T-Scan achieved= 27.5 Sq. In. Z2S6 T-Scan achieved= 222 Sq. In. Z2S4 T-Scan achieved= 8.6 Sq. In. ZlS6 P-Scan achieved= 27.5 Sq. In. 2256 P-Scan achieved= 22.2 Sq. In. Z2S4 P-Scan achieved= 8.6 Sq. In.

BK (RPV Longitudinal Weld)-23RIO (Continued) Susquehanna Unit-1 Weld BK - SC4 Long. Zone 1 56 Exam Volume= 27.5 Sq. In. Zone2 S6 Exam Volume=222 Sq. In. Zone 2 S4 Exam Volume= 8.6 Sq. In. 2156 T-Scan achieved= 27.5 Sq. In. 2256 T-Scan achieved= 22.2 Sq. In. Z2S4 T-Scan achieved = 8.6 Sq. In. 2156 P-Scan achieved= 27.5 Sq. In. Z2S6 P-Scan achieved= 22.2 Sq. In. Z2S4 P-Scan achieved= 8.6 Sq. In. I 0 0 0 0 I Reactor Pressure Vessel Coverage Plots q_ P-Scans 60"T 45"T I I r--- 1 I I L _____ ScannerMotion _____________ J 8.0" Right Side Scans -16.0" References Seam Detolls fsheffi-Weld detofl

  1. 4 Shell Ring Assembly - Rod[us:. shtl! ordered thickness &dod nominal Right Side Scans - Normal and Reversed PLA-81 72, Enclosure 2 Page 11 of 21

BK (RPV Longitudinal Weld) - 23RIO (Continued) Weld Length = Exam Volume= 2156T-5can 2256T-5can 2254 T-5can 2156 P-5can 22 56 P-Scan Z2 S4 P-Scan Zl S6 T-Scan 22 56T-Scon 22S4T-5can 21S6 P-Scan Z2 56 P-5can Z2 S4 P-Scan Zl S6 T-Scan Z2 S6T-Scon 22 S4 T-Scan 21 S6 P-Scan Z2 S6 P-5can 22 S4 P-Scan Comments: 86.00 58.30 A A A A A A Longitudinal Weld BK CROSS-SECTIONAL AREA Required Exam Area Sq. in. 27.50 22.20 8.60 27.50 22.20 8.60 Area Examined 27.50 22.20 8.60 27.50 22.20 8.60 Percent of Area Examined 47.2% 38.1% 14.8% 47.2% 38.1% 14.8% TOTAL CODE COVERAGE Weld Length Examined 70.00 70.00 70.00 70.00 70.00 70.00 % Total Composite Coverage= A-Automated scanning was limited due to a non removable insulation support This calculation is in accordance with ASME Section XI 2007 Edition w/ 2008 Adendda. Full single side coverage is permitted. Note - Rounding methods may affect calculated values. FV-Full volume, NS-Near Surface. Weld length in inches. Percent Examined 19.2% 15.5% 6.0% 19.2% 15.5% 6.0% 81.4% PLA-8172, Enclosure 2 Page 12 of 21

BK (RPV Longitudinal Weld)-23RIO (Continued) Examination Results: PLA-8172, Enclosure 2 Page 13 of 21 Ultrasonic examination results were acceptable to the requirements of ASME Section XI, 2007 Edition with 2008 Addenda, as modified by the PDI program description and the Federal Register, Part II, Nuclear Regulatory Commission, 10 CFR Part 5 0 for Category B-A RPV Assembly Welds. Automated transverse and parallel scanning was performed using phased array shear wave focal laws generating sectoral scans. Two zones are examined. Zone 1 extends from the entry surface to a depth of 3 inches. Zone 1 is examined using beam angles 60° to 85° in 1 °increments.Zone 2 extends from 2 inches in depth to the inside surface. Zone 2 is examined using beam angles 35° to 65° in 1 ° increments. No recordable indications were detected. Non-recordable indications due to welding artifacts and plate segregates were observed. Geometric indications from the vessel inside surface were observed. Previous data was reviewed. The examination was limited/restricted due to the proximity of a non-removable insulation support ring. Achieved coverage was 81.4%.

BM (RPV Longitudinal Weld) - 23RIO L04 BM ROl U7 vJ ---J U7 0 PLA-8172, Enclosure 2 Page 14 of 21 Reactor Pressure Vessel Coverage Plots L03 R03 Scanned Patches L02 R02 m N vJ U7 0

BM (RPV Longitudinal Weld) - 23RIO ( continued) PLA-81 72, Enclosure 2 Page 15 of 21 Reactor Pressure Vessel Coverage Plots 45°T 60°T P-5cans I ---7 I I I 1----

j I L _____________ ScannerMatian _____ _J 16.0" Left Side Scans

-8.o* References Seom De.tons lsheUI-Weld detail

  1. 4 Shell Ring ASSembly - Radius. shell ordered thid<ness & dad nonmrnol Left Side Scans - Normal and Reversed Susquehanna Unit-1 Weld BM - SC4 Long.

Zone 156 Exam Volume= 27.5 Sq. In. Zone 2 S6 Exam Volume= 22.2 Sq. In. Zone 2 S4 Exam Volume= 8.6 Sq. In. Z1S6 T-Scan achieved= 27.5 Sq. In. Z2S6 T-Scan achieved= 22.2 Sq. In. Z2S4 T-Scan achieved= 8.6 Sq. In. Z1S6 P-Scan achieved= 27.S Sq. In. Z2S6 P-Scan achieved = 22.2 Sq. In. Z2S4 P-Scan achieved= 8.6 Sq. In.

BM (RPV Longitudinal Weld) - 23RIO ( continued) Susquehanna Unit-1 Weld BM - SC4 Long. Zone 1 S6 Exom Volume= 27.S Sq. In. Zone 2 S6 Exom Volume= 22.2 Sq. In. Zone 2 S4 Exom Volume= 8.6 Sq. In. ZlS6 T-Scan ochieved = 27.S Sq. In. Z2S6 T-Scan achieved= 22.2 Sq. In. Z2S4 T-Scan achieved =8.6 Sq. In. ZlS6 P-Scan ochieved = 27.S Sq. In. Z2S6 P-Scan achieved= 22.2 Sq. In. Z2S4 P-Scan achieved= 8.6 Sq. In. Reactor Pressure Vessel Coverage Plots T/P-Scons P-Scans I I r--- 1 I I ]----- 60°T 45°T I I I L _____ ScannerMatian _____________ J 8.0" RightSideScans -16.o* References Seom Oetai~ lshenJ-Weld detail

  1. 4 Shell Ring Asserrbly - Radius. shell ordered thickness &dad nomlnol Right Side Scans - Normal and Reversed PLA-81 72, Enclosure 2 Page 16 of 21

BM (RPV Longitudinal Weld) - 23RIO ( continued) Longitudinal Weld BM Weld Length = 86.00 Exam Volume= 58.30 Zl S6 T-Scan A Z2 S6 T-Scon A Z2 S4 T-Scan A Zl S6 P-Scan A 22 S6 P-Scon A 22 S4 P-Scan A Z1S6T-Scon Z2S6T-Scon 2254 T-Scon Z1S6 P-Scon Z2 S6 P-Scon Z2S4 P-Scan Z1S6T-Scon 22S6T-Scon 2254 T-Scon 21S6 P-Scon 2256 P-Scon 2254 P-Scon CROSS-SECTIONAL AREA Required Exam Area Sq.in. 2750 2220 8.60 27.50 2220 8.60 Area Examined 2750 22.20 8.60 27.50 22.20 8.60 Percent of Area Examined 47.2% 38.1% 14.8% 47.2% 38.1% 14.8% TOTAL CODE COVERAGE Weld Length Examined 70.00 70.00 70.00 70.00 70.00 70.00 % Total Composite Coverage= Comments: A -Automated scanning was limited due to a non removable insulation support This colculotion is in accordance with ASME Section XI 2007 Edition w/ 2008 Adendda. Full single side coverage is permitted. Note - Rounding methods may affect calculated values. FV-Full volume. NS-Near Surface. Weld length in inches. PLA-8172, Enclosure 2 Page 17 of21 Percent Examined 192% 155% 6.0% 19.2% 15.5% 6.0% 81.4%

BM (RPV Longitudinal Weld) - 23RIO ( continued) Examination Results: PLA-8172, Enclosure 2 Page 18 of 21 Ultrasonic examination results were acceptable to the requirements of ASME Section XI, 2007 Edition with 2008 Addenda, as modified by the PDI program description and the Federal Register, Part II, Nuclear Regulatory Commission, 10 CFR Part 50 for Category B-A RPV Assembly Welds. Automated transverse and parallel scanning was performed using phased array shear wave focal laws generating sectoral scans. Two zones are examined. Zone 1 extends from the entry surface to a depth of 3 inches. Zone I is examined using beam angles 60° to 85° in 1 °increments.Zone 2 extends from 2 inches in depth to the inside surface. Zone 2 is examined using beam angles 35° to 65° in I 0 increments. No recordable indications were detected. Non-recordable indications due to welding artifacts and plate segregates were observed. Geometric indications from the vessel inside surface were observed. Previous data was reviewed. The examination was limited due to the proximity of a non-removable insulation support ring. Achieved coverage was 81.4%.

AF (0-360) Shell (RPV Shell-to-Flange Weld)-23RIO 17.lin. 60°T I SSES SCS-VFLG (0 - 360) Coverage Plots Susquehanna Unit-1 Shell to Flange Weld 60° S6 Exam Volume= 62.0 Sq. In. 60° S4 Exam Volume= 12.1 Sq. In. 60° S6 T-Scan achieved= 54.5 Sq. In. 60° S4 T-Scan achieved= 12.1 Sq. In. 60° S6 P-Scan achieved= 36.6 Sq. In. 60° S4 P-Scan achieved= 6.5 Sq. In. 6.3 in. 4.5 in. 60° NS 60° P <t_ l.4in. 60°T/P I I I I '\\ \\ I 1 --1 I I I I I ---7 I PLA-8172, Enclosure 2 Page 19 of 21

AF (0-360) Shell (RPV Shell-to-Flange Weld) - 23RIO ( continued) Weld Length = Exam Volume= -60°T-Scan (SG FV) 60° T-Scan (S4 UC) 60° P-Scan (S6 FV) 60° P-Scan (S4 UC) G0°T-Scan (S6 FV) 60° T-Scan (S4 UC) 60° P-Scon (SG FV) 60° P-Scan (S4 UC) 60°T-Scan (SG FV) G0°T-Scan (S4 UC) 60° P-Scan (S6 FV) 60° P-Scan (S4 UC) 60°T-Scan (SG FV) 60°T-Scan (S4 UC) 60° P-Scan (S6 FV) 60° P-Scan (S4 UC) 360.0 74.1 A A A A SSES Unit-1 SCS-VFLG (0-360) CROSS-SECTIONAL AREA Required Exam Area Area Sq. in. Examined 62.0 54.5 12.1 12.1 62.0 36.6 12.1

6.5 Comments

A - Manual scanning was limited due to the flange configuration. Near surface and full volume cross sectional area listed as (S6 FV). TOTAL CODE COVERAGE Percent of Area Weld Length Examined Examined 73.5% 360.0 163% 360.0 49.4% 360.0 8.8% 360.0 % Total Composite Coverage= This calculation is in accordance with ASME Section XI 2007 Edition w/ 2008 Addenda. Full single side coverage is permitted. Note - Rounding methods may affect calculated values. S4 - Supplement 4, S6 - Supplement 6 volume. Weld length in degrees. Percent Examined 36.8% 8.2% 24.7% 4.4% 74.0% PLA-8172, Enclosure 2 Page 20 of 21 Rev. 03/01/2019 VE-24-001 Page 5 of6

AF (0-360) Shell (RPV Shell-to-Flange Weld)-23RIO (continued) Examination Results: PLA-8172, Enclosure 2 Page21 of21 Ultrasonic examination results were acceptable to the requirements of AS:ME Section XI, 2007 Edition with 2008 Addenda, as modified by the PDI program description and the Federal Register, Part II, Nuclear Regulatory Commission, 10 CFR Part 5 0 for Category B-A RPV Assembly Welds. Manual transverse and parallel scanning was performed using 60° Refracted Longitudinal search units from the vessel outer diameter surface. Manual scanning was limited by the flange configuration. No recordable indications were detected. Non-recordable plate segregates were observed.

PLA-8172, Enclosure 3 Additional Details and Supporting Documentation Relative to SSES Unit 2

BK (RPV Longitudinal Weld)-21RIO i1 u, u, ~ BK PLA-8172, Enclosure 3 Page 1 of 14 Examination Coverage BK-SC4 Longitudinal Weld LJ u, co p Ln Ln (j'\\ f:- --..,J Ln Left Side Scans Right Side Scans (j'\\ w (j'\\ Automated Scanned Areas Left Side and Right Side Scanning was restricted due to on insulation support ring. An attempt to scan from below the support ring was performed resulting in no additional coverage obtained.

BK (RPV Longitudinal Weld)-21RIO (Continued) PLA-8172, Enclosure 3 Page 2 of 14 Examination Coverage BK-SC4 Longitudinal Weld 45"T I I I I ---{ I L _________ SconnerMotion _________ _J 18.5" Left Side Scans -6S' References seam De.toils lshelO-weld detoil

  1. 4 Shell Ring Assembly-Rodius,shelt ordered thickness & clad nonm1nol Susquehanna Unit-2 Weld BK - SC4 Long.

70° Exam Volume= 9.2 Sq. In. 45° Exam Volume= 40.4 Sq. In. 60° Exam Volume= 8.6 Sq. In. 70° T-Scon achieved = 9.2 Sq. In. 45° T-Scon achieved= 40.4 Sq. In. 60° T-Scon achieved= 8.6 Sq. In. 70° P-Scon achieved= 9.2 Sq. In. 45° P-Scon achieved= 40.4 Sq. In. 60° P-Scon achieved= 8.6Sq. In.

BK (RPV Longitudinal Weld)-21RIO (Continued) SusquehannaUnit-2 Weld BK - SC4 Long. 70° Exam Volume= 9.2 Sq. In. 45° Exam Volume= 40.4 Sq. In. 60° Exam Volume= 8.6 Sq. In. 70° T-Scan achieved= 9.2 Sq. In. 45° T-Scon achieved= 40.4 Sq. In. 60° T-Scan achieved= 8.6 Sq. In. 70° P-Scan achieved= 9.2 Sq. In. 45° P-Scan achieved= 40.4 Sq. In. 60° P-Scan achieved= 8.6 Sq. In. Examination Coverage BK-SC4 Longitudinal Weld !TIP-Scans q_ P-Scans 70°T 45°T PLA-8172, Enclosure 3 Page 3 of 14

7;::?If----_-_-_T:T_-_-_-_-r::::::::==:o---~,------

60°T I 1 I I I I f---- L _________ ScannerMation 6.5" Right Side Scans -18.5" Rererences Seem Oetoils (!;helO -Wl?ld detail

  1. 4 Shell Ring Assembly-Radius. shell ordered thiekness: &.clod nonminol

BK (RPV Longitudinal Weld)-21RIO (Continued) Weld Length = Exam Volume= 70° T-Scan (S6 NS) 45° T-Scan (S6 FV) 60° T-Scan (S4) 70° P-Scan (S6 NS) 45° P-Scan (S6 FV) 60° P-Scan (S4) 70° T-Scan iS6 NS) 45° T-Scan (S6 FV) 60° T-Scan (S4) 70° P-Scan (S6 NS) 45° P-Scan (S6 FVl 60° P-Scan (S4) 70° T-Scan [S6 NS) 45° T-Scan {S6 FV) 60° T-Scan (S4) 70° P-Scan (S6 NS) 45° P-Scan (S6 FVl 60° P-Scan {S4)

86.

58.2 A A A A A A Susquehanna Unit 2, U2-211RO BK-SC4 Longitudinal Weld CODE CROSS-SECTIONAL AREA Percent Required Exam Area Scanned of Area Area Sq. in. Automated Automated 9.2 9.2 15.8% 40.4 40.4 69.4% 8.6 8.6 14.8% 9.2 9.2 15.8% 40.4 40.4 69.4% 8.6 8.6 14.8% TOTAL CODE COVERAGE Weld Length Automated 62 62 62 62 62 62 % Total Composite Coverage= Comments: A - Automated scanning was restricted due to the proxmity of a non removable insulation support ring. Note - Rounding methods may affect calculated values. UC-Underclad, FV-Full volume, NS-Near Surface. Weld length in inches. PLA-8172, Enclosure 3 Page 4 of 14 Percent Automated 5.7% 25.0% 5.3% 5.7% 25.0% 53% 72.1% Rev. 0 9/23/05

BK (RPV Longitudinal Weld)-21RIO (Continued) Examination Results: PLA-8172, Enclosure 3 Page 5 of 14 Ultrasonic examination results were acceptable to the requirements of ASJVIB Section XI, 2007 Edition with 2008 Addenda, as modified by the PDI program description and the Federal Register, Part II, Nuclear Regulatory Commission, 10 CFR Part 50 for Category B-A RPV Assembly Welds. Automated transverse and parallel scanning was performed using 45° shear wave, 60° Refracted Longitudinal and 70° Refracted Longitudinal search units from the vessel outer diameter surface. Supplemental 0° longitudinal wave scans were also performed. No recordable indications were detected. Non-recordable welding artifacts, clad restoration, and shell course 4 to shell course 5 transition were observed. Automated scanning was limited due to an insulation support ring at the top of the bioshield. An attempt was made which resulted in no additional coverage achieved below the insulation support ring. Reduced scanning area resulted in an aggregate coverage of 72.1 %. Previous data was reviewed with no significant changes.

BM (RPV Longitudinal Weld) - 2 lRIO z ~ n PLA-8172, Enclosure 3 Page 6 of 14 Examination Coverage BM-SC4 Longitudinal Weld lJ1 co lJ1 I-' lJ1 I.O I --...J Left Side Scans lJ1 BM Right Side Scans lJ1 O"I 9" lJ1 Automated Scanned Areas Left Side and Right Side Scanning was restricted due to an insulation support ring. O"I L,J ~ O"I L,J ~ An attempt to scan from below the support ring was performed resulting in no additional coverage obtained.

BM (RPV Longitudinal Weld)-21RIO (Continued) PLA-8172, Enclosure 3 Page 7 of 14 Examination Coverage BM-SC4 Longitudinal Weld 4S°T 70°T J I I I ---j I L _________ ScannerMation _________ _j 18.5" Left Side Scans -6S Refer2nces Seorr: Detoi!s !she!O -Weld detail

  1. 4 SJ-el! Ring Assembly~ Rodios.shcll ordered thickness &dod nonmlnol Susquehanna Unit-2 Weld BM - SC4 Long.

70° Exam Volume= 9.2 Sq. In. 45° Exam Volume= 40.4 Sq. In. 60° Exam Volume= 8.6 Sq. In. 70° T-Scon achieved= 9.2 Sq. In. 45° T-Scon achieved= 40.4 Sq. In. 60° T-Scon achieved= 8.6 Sq. In. 70° P-Scan achieved= 9.2 Sq. In. 45* P-Scan achieved = 40.4 Sq. In. 60° P-Scan achieved = 8.6 Sq. In.

BM (RPV Longitudinal Weld)-21Rl0 (Continued) SusquehannaUnit-2 Weld BM - SC4 Long. 70° Exam Volume= 9.2 Sq. In. 45° Exam Volume =40.4 Sq. In. 60° Exam Volume=8.6 Sq. In. 70° T-Scon achieved= 9.2 Sq. In. 45° T-Scon achieved= 40.4 Sq. In. 60° T-Scan achieved = 8.6 Sq. In. 70° P-Scan achieved= 9.2 Sq. In. 45° P-Scan achieved= 40.4 Sq. In. 60° P-Scan achieved= 8.6 Sq. In. I Examination Coverage BM-SC4 Longitudinal Weld ~IP-Scans P-Scans 70°T 45°T PLA-8172, Enclosure 3 Page 8 of 14

:i-:;;;;-:----\\;/--~:::::::;::::-----~r---__,60°T I

I I I f----- L _________ ScannerMotion 6.5" Right Side Scans -18.5" References Seam Oetoils tshell)*We!d detoU

  1. 4 Shell Ring Assembly~ Rodlus. she!! ordered tl"tickness &.dod nonmmol

BM (RPV Longitudinal Weld)-21RIO (Continued) Weld Length= Exam Volume= 70° T-Scan (S6 NS) 45° T-Scan (S6 FV) 60°T-Scan (S4) 70° P-Scan [S6 NS) 45° P-Scan {S6 FVJ 60° P-Scon {S4l 70° T-Scan (S6 NS) 45° T-5can (S6 FV) 60° T-Scan (S4) 70° P-Scan (56 NS) 45° P-Scan {S6 FVI 60° P-Scan (54) 70°T-Scan (56 NS) 45° T-Scan (S6 FVI 60°T-Scan (S4) 70° P-Scan (S6 NS) 45° P-Scan (S6 FV) 60° P-Scan (541

86.

58.2 A A A A A A Susquehanna Unit 2, U2-211RO BM-SC4 Longitudinal Weld CODE CROSS-SECTIONAL AREA Percent Required Exam Areo Scanned of Area Area Sq. in. Automated Automated 9.2 9.2 15.8% 40.4 40.4 69.4% 8.6 8.6 14.8% 9.2 9.2 15.8% 40.4 40.4 69.4% 8.6 8.6 14.8% TOTAL CODE COVERAGE Weld Length Automated 60.25 60.25 60.25 60.25 60.25 60.25 PLA-8172, Enclosure 3 Page 9 of 14 Percent Automated 5.5% 243% 5.2% 5.5% 24.3% 5.2% % Total Composite Coverage= 70.1% Rev. 0 9/Z3/05 Comments: A - Automated scanning was restricted due to the proxmity of a non removable insulation support ring. Note - Rounding methods may affect calculated values. UC-Underclad, FV-Full volume, NS-Near Surface. Weld length in inches.

BM (RPV Longitudinal Weld)-21RIO (Continued) Examination Results: PLA-8172, Enclosure 3 Page 10 of 14 Ultrasonic examination results were acceptable to the requirements of ASME Section XI, 2007 Edition with 2008 Addenda, as modified by the PDI program description and the Federal Register, Part II, Nuclear Regulatory Commission, 10 CPR Part 50 for Category B-A RPV Assembly Welds. Automated transverse and parallel scanning was performed using 45° shear wave, 60° Refracted Longitudinal and 70° Refracted Longitudinal search units from the vessel outer diameter surface. Supplemental 0° longitudinal wave scans were also performed. No recordable indications were detected. Non-recordable welding artifacts, clad restoration, and shell course 4 to shell course 5 transition were observed. Automated scanning was limited due to an insulation support ring at the top of the bioshield. An attempt was made which resulted in no additional coverage achieved below the insulation support ring. Reduced scanning area resulted in an aggregate coverage of 70.1 %. Previous data was reviewed with no significant changes.

AF (0-360) Shell (RPV Shell-to-Flange Weld)-21RIO 17.1 in. 60°T I Susquehanna Shell to Flange Weld 60° 56 Exam Volume= 62.0 Sq. In. 60° 54 Exam Volume= 12.1 Sq. In. 60° 56 T-Scan achieved= 54.5 Sq. In. 60° 54 T-Scan achieved= 12.1 Sq. In. 60° 56 P-Scon achieved= 36.6 Sq. In. 60° 54 P-Scan achieved = 6.5 Sq. In. 10.8in. 60°TZ1 4.5 in. 60°T/P <t_ 1.4 in,. [ 60?/P I \\ \\ \\ I I I I I I

i I

PLA-8172, Enclosure 3 Page 11 of 14

AF (0-360) Shell (RPV Shell-to-Flange Weld)-21RIO (Continued) Weld Length = Exam Volume= 60° T-Scan (S6 FV) 60° T-Scan (54 UC) 60° P-Scan (56 FVl 60° P-Scan (S4 UC) 60° T-Scan (56 FV) 60° T-Scan (S4 UC) 60° P-Scan 1S6 FV) 60° P-Scan IS4 UC) 60°T-Scan (S6 FV) 60° T-Scan (S4 UC) 60° P-Scan (S6 FV) 60° P-Scan 154 UC) 60°T-Scan (S6 FV) 60° T-Scan (S4 UC} 60° P-Scan (S6 FVl 60° P-Scan IS4 UC) Comments: A - Manual scanning 360.0 74.1 A A A A Susquehanna Unit 2 U2-21RIO AF (Shell to Flange) CODE CROSS-SECTIONAL AREA Required Exam Area Sq. in. 62.0 12.1 62.0 12.1 Area Examined 54.5 12.1 36.6 6.5 TOTAL CODE COVERAGE Percent of Area Weld Length Examined Examined 73.5% 360.0 16.3% 360.0 49.4% 360.0 8.8% 360.0 % Total Composite Coverage= This calculation is in accordance with ASME Section XI 2007 Edition w/ 2008 Addenda. Full single side coverage is permitted. Note - Rounding methods may affect calculated values. S4 - Supplement 4, S6 - Supplement 6 volume. Weld length in degrees. PLA-8172, Enclosure 3 Page 12 of 14 Percent Examined 36.8% 8.2% 24.7% 4.4% 74.0% Rev. 03/01/2019

AG (0-360) (RPV Head-to-Flange Weld)-21RIO 1.3.Sin. SO"T SJsquehanna aosure Head to Range Weld so* s; ecam "\\blume=37.9 s:i. In. 60" $T-S:an achielled =34.9 Si.In. 60' S'S P-S:an aehielle::I =25.5 3!. In. 8,3in. 60"TZ1 I 5.4 in. 3.7 ln. SO'TNS SO'P I I PLA-8172, Enclosure 3 Page 13 of 14

AG (0-360) (RPV Head-to-Flange Weld)-21RIO (Continued) Weld Length = Exam Volume= 60°T-Scon (S6 FVl 60° T-Scon (S4 UC) 60° P-Scon 1S6 FVl 60° P-Scon (S4 UC) 60°T-Scan (S6 FVl 60°T-Scan 1S4 UC! 60° P-Scon (S6 FVI 60° P-Scan (S4 UC! 60°T-Scon (S6 FVJ 60° T-Scan (S4 UC! 60° P-Scan (S6 FVI 60° P-Scan !S4 UC) 60"T-Scan (S6 FVl 60° T-Scan (S4 UC! 60° P-Scon (S6 FVI 60° P-Scon 1S4 UC! Comments: A - Manual scanning 360.0 37.9 A A A A Susquehanna Unit 2 U2-21RIO AG (Closure head to Flange) CODE CROSS-SECTIONAL AREA Required Exam Area Sq.in. 37.9 0.0 37.9 0.0 Area Examined 34.9 0.0 2S5 0.0 TOTAL CODE COVERAGE Percent of Area Examined 92.1% 0.0% 67.3% 0.0% Weld Length Examined 360.0 360.0 360.0 360.0 % Total Composite Coverage= This calculation is in accordance with ASM E Section XI 2007 Edition w/ 2008 Addenda. Full single side coverage is permitted. Note - Rounding methods may affect calculated values. S4 - Supplement 4. S6 - Supplement 6 volume. Weld length in degrees. PLA-8172, Enclosure 3 Page 14 of 14 Percent Examined 46.0% 0.0% 33.6% 0.0% 79.7% Rev. 03l0l/2019}}

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