SBK-L-22036, Steam Generator Tube Inspection Report

Steam Generator Tube Inspection Report

ML22115A158
Person / Time
Site:	Seabrook
Issue date:	04/25/2022
From:	Levander M NextEra Energy Seabrook
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
SBK-L-22036
Download: ML22115A158 (26)

Text

NEXTera ENERGY e SEABROOK April 25, 2022 SBK-L-22036 Docket No. 50-443 U.S . Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Seabrook Station Steam Generator Tube Inspection Report Enclosed is the Seabrook Station Steam Generator Tube Inspection Report. NextEra Energy Seabrook, LLC is submitting this report in accordance with Seabrook Station Technical Specification 6.8.1.7, Steam Generator Tube Inspection Report. This report provides the results of the steam generator tube inspections conducted during refueling outage 21 in the Fall of 2021.

This letter contains no new regulatory commitments.

If you have any questions regarding this submittal, please contact me at (603) 773 -7631.

Sincerely, Nex;;;~rJ Matthew Levander Regulatory Affairs Manager Enclosure cc: NRC Region I Administrator J. Poole, NRC Project Manager NRC Senior Resident Inspector NEXTERA ENERGY SEABROOK, LLC , P.O. Box 300, LAFAYETTE ROAD , SEABROOK, NH 03874

Enclosure Steam Generator Tube Inspection Report

SBK-L-22036 Enclosure Seabrook Station OR21 Steam Generator Tube Inspection Report

==

Introduction:==

The enclosed Steam Generator Tube Inspection Report for Seabrook Unit 1 is submitted for the inspection of the SGs during refueling outage 21 (hereafter referred to as the OR21 inspection or outage), as required by Technical Specification section 6.8.1.7. The OR21 SG inspection was performed in accordance with Technical Specification 6.7.6.k and was the second inspection of the SGs in the fourth ISi period of 72 EFPMs. References to Seabrook's prior SG Tube Inspection Reports in the third and fourth inspection periods are tabulated in Appendix A along with a list of acronyms used in this report. At unit shutdown for the OR21 inspection, the SGs had operated for approximately 27.37 EFPY since installation. This included operation for approximately 1.4 EFPY (16.8 EFPM) during the fuel cycle (cycle 21) leading up to the OR21 inspection. Initial entry into Mode 4 following completion of the OR21 inspection was made on October 27, 2021.

Seabrook Unit 1 is a Westinghouse 4-loop PWR with Model F steam generators. The SGs are U-tube heat exchangers with tube bundles fabricated using thermally-treated Alloy 600 tubing. Nominal That is 621 F. Each SG contains 5,626 tubes arranged in 59 rows and 122 columns. The tubes have a square pitch arrangement, and nominal tube OD is 0.688" with a 0.040" nominal wall thickness. Internal supports include 8 horizontal tube support structures made of stainless steel where the lowest is a flow distribution baffle (FOB) with drilled holes. The other 7 structures are broached-hole, quatrefoil tube support plates (TSPs). The U-bend region is supported by 3 sets of anti-vibration bars (AVBs). Rows 1-10 of tubing in each SG were stress relieved in the U-bend region after bending.

A. Scope of Inspections Performed on each SG In OR20, axial ODSCC indications were identified on tubes with dents at TSP intersections at the uppermost support plate in SG-B. Therefore, the scope of SG exams in OR21 was selected to inspect for this degradation mechanism per the requirements of Section 6.7.6.k.d.3 of site Technical Specifications. In addition, Seabrook Station intends to submit a License Amendment Request (LAR) to adopt "Revised Frequencies for Steam Generator Tube Inspections" (TSTF-577 Rev. 1) 1 .

SG inspections in OR21 will be credited during the LAR process as the implementation outage for TSTF-577 Rev. 1; therefore, the scope of inspections performed was also selected to meet the requirements therein. The OR21 inspection scope met the requirements of the Seabrook Unit 1 Technical Specifications, NEI 97-06 Rev 3 and its referenced EPRI SGMP Guidelines. Unless otherwise noted, the OR21 base scope inspection in all SGs was:

Primary-side:

• 100% full-length enhanced probe 2 exams of all active tubes.

- Low row U-bends (rows 1 & 2) were inspected with the +Point' probe between the uppermost TSP on the HL and CL.

- All other active tubes were inspected full-length with the array/bobbin probes.

- Examination of peripheral tubes at the TTS, BLG/OXP indications within the H* depth of the tubesheet, and all tubes within the tubesheet program are included in utilizing the full-length enhanced probe exams.

• 100% inspection of Dings/Dents

- Dings: ::;;11v with the array probe; >11V with the +Point' probe.

1 TSTF-577 Rev. 1, "Revised Frequencies for Steam Generator Tube Inspections", NRG ADAMS Accession No. ML21099A086.

2 The enhanced probe inspection method is described in the NRG Final Safety Evaluation for TSTF-577 Rev. 1 (NRG ADAMS Accession No. ML21098A188).

SBK-L-22036

- Dents: :5:7.5V with the array probe; >7.5V with the +Point' probe.

- Dings/Dents <5V examined with the bobbin probe.

• +Point' probe inspection of all HL and CL TSP locations on high stress tubes. In addition,

+Point inspection of all HL TSP locations having a support plate residual. 3

• Various diagnostic/special interest exams using the +Point' probe including all I-codes from bobbin and array probe exams, tubes in the vicinity of newly identified or prior PLPs, tubes adjacent to the locations of known foreign objects, and any tubes with unusually high growth.

• Visual inspection of all mechanical and welded plugs.

• Visual inspection of all channel head bowl components and bowl scan everywhere within the channel head bowl with remote visual camera in both the HL and CL per Westinghouse NSAL 12-1 Rev 1, "Steam Generator Channel Head Degradation," October 2017.

Secondary side:

• Cleanliness inspection at the TIS (annulus, no-tube lane) after sludge lancing.

• Foreign object search and recovery (FOSAR) at the TIS including in-bundle exams.

• Visual inspection (in SG-B) of components of the Upper Internals including the feedwater ring and supports, and moisture separator components.

B. Degradation Mechanisms Found The following degradation mechanisms were identified during the OR21 inspection:

• A single axial ODSCC indication (SAi) on a tube within the expansion transition region of the HL in SG-C.

• Two single axial ODSCC indications (SAi) on one tube within the quatrefoil region of the uppermost TSP of the HL in SG-B.

• Wear at AVB contact points.

• Wear (volumetric) indications at, or above the TTS and at TSPs.

• Maintenance-related wear at the FOB and in the freespan.

• Foreign object wear Axial crack-like indications on tubes at TSPs and at the TTS are existing degradation mechanisms at Seabrook; therefore, no new degradation mechanisms were identified in OR21.

Inspection Expansion:

Since the base scope exams included a 100% full-length inspection of all tubes in each SG with an enhanced probe, expansion of the inspection program due to the ODSCC indications found was not required. Additional details on the crack-like ODSCC indications are provided later in the report.

3 This is characterized by TSP locations (high stress, non-high stress tubes) having a vertical maximum noise component of >0.45V on the P1 mix channel.

SBK-L-22036 C. NOE Techniques utilized for e~ch Degradation Mechanism Table 1a is the list of the EPRI ETSSs used for degradation detection during the OR21 ECT inspection.

Table 1a - NOE Detection Techniques utilized Detection ETSS used for Degradation Location I Applicability probe Detection Mechanism 196041.1 Rev 5 AVB locations Bobbin 96004.1 Rev 13 TSP, FOB locations Bobbin 27091.2 Rev 2 Wear

+Point' 21998.1 Rev 4 foreign objects Array 20400.1 Rev 5 Bobbin 96005.2 Rev 9 freespan, sludge pile Pitting Array 24998.1 Rev 1 sludqe pile Broached TSPs, 1-28411 Rev 4 FOB locations Bobbin 1-28413 Rev 5 frees pan 24013.1 Rev 2 DNG/DNT~5V 10013.1 Rev 1 22401.1 Rev 4 Axial ODSCC 96703.1 Rev 17 DNG/DNT >5V

+Point' 1-28424 Rev 4 1-28425 Rev 4 10411 .1 Rev 0 low row U-bends sludge pile/

Array 20400.1 Rev 5 expansion transition 20501.1 Rev 4 Axial PWSCC expansion transition, Array 20500.1 Rev 4 CircPWSCC BLGs/OXPs 96511.1Rev16 Axial/Ci re

+Point' 96511.2 Rev 16 low row U-bends PWSCC 99997.1 Rev 10 Table 1b is the list of the EPRI ETSSs used for degradation sizing based on the degradation mechanisms reported during the OR21 ECT inspection.

Table 1b - NOE Sizing Techniques utilized Sizing ETSS used for Degradation Location I Applicability probe Sizing Mechanism Bobbin 96004.3 Rev 13 Wear AVB locations

+Point' 96910.1 Rev 11 Wear Broached TSP locations Foreiqn object wear

+Point' 21998.1 Rev4 Wear(VOL) Wear due to legacy sludge lance (maintenance) equipment At dented broached TSP

+Point' 1-28432 Rev 2 Axial ODSCC locations (08H, 08C)

At H L TIS Expansion

+Point' 1-28431 Rev 3 Axial ODSCC Transition

SBK-L-22036 D. Location, orientation (if linear), and measured sizes (if available) of service induced indications OOSCC:

- A single axial crack-like indication (SAi) of OOSCC was reported on a tube (R25C51) at the expansion transition sludge pile region in SG-C.

- Two single axial crack-like indications (SAi) of OOSCC were reported on one tube (R8C116) within the quatrefoil region of the uppermost TSP in SG-B.

The location and measured size of each OOSCC indication are characterized as shown in Table 2 below. Section G of this report summarizes the results of condition monitoring for these indications.

Appendix B also provides a more detailed discussion on the OOSCC indications reported in OR21.

Table 2 - OR21 ODSCC Indications Location Reporting Code Indication sizes Max. Volts Row Col elevation SG Bobbin +Point' length (in.) Max. depth (% TW) (+Point')

25 51 TSH-0.2 c NOD SAi 0.27 81.52% 1.26 08H+0.14 NOD SAi 0.25 37.88% 0.16 8 116 B 08H-0.2 NOD SAi 0.11 46.35% 0.21 8 116 08H combined B - - 0.59 46.35% 0.21 For other types of service-induced indications (summarized below), Appendix C provides a listing for each SG, showing locations and measured sizes.

AVB Wear: AVB wear continues to be an existing degradation mechanism in all four SGs at Seabrook. The list of AVB indications reported during OR21 is included in Appendix C. Twenty-seven (27) new indications of AVB wear were reported in 25 tubes. The largest AVB wear indication was 39% TW. The total number of AVB indications is typical among the population of Model F SGs.

Wear (Volumetric) Indications At or Above the TTS: Volumetric wear indications reported in OR21 are attributed to a) legacy maintenance-related (MNT) activity; b) wear at horizontal tube support structures, or c) wear associated with foreign objects (FOs). The indications were all sized using qualified EPRI ETSSs (Table 1b) for the +Point' probe and are listed in Tables 3a, 3b and 3c.

a) Indications reported in row 1 that are located approximately 18" above the tubesheet or above the FOB plate are attributed to sludge lancing equipment used in the past. The wear indications were caused by interaction of the tubes with the sludge lance rail. All maintenance-related volumetric indications remain essentially unchanged and within inspection technique variabilities from previous inspections. Volumetric indications from legacy secondary-side equipment are listed in Table 3a.

b) Wear due to impingement of foreign objects (FOs) on the tubes is categorized as an existing degradation mechanism due to the confirmation of FOs in the current and prior inspections at Seabrook. Volumetric wear indications in the following areas are considered to originate from foreign objects: ones that are at the edge of TSP intersections which are not aligned axially with the land contact point, that reside slightly above or below the TSP, and ones in proximity to the TTS. There were no newly reported FO VOL indications. There were also no VOL indications reported near, at, or around any PLP signal or visually confirmed loose part. Volumetric indications from FO-related wear are listed in Table 3b.

c) Twelve (12) TSP wear indications were newly reported in OR21. These indications were detected during the array probe inspection, but lookbacks show these indications have not significantly changed in size for several inspections. Using an in-generator mix to reduce the response from the support plate, these indications had a bobbin response over the past several cycles and has remained unchanged. All historic TSP VOL indications remain essentially unchanged from previous inspections due to eddy current variabilities and uncertainties and is considered to have no growth. Volumetric indications from TSP wear are listed in Table 3c.

SBK-L-22036 OR21 Volumetric (VOL) Indications from Maint. Equipment, TSP Wear and Foreign Object Wear Table 3a SG Row Col Location %TW OR21 Indications from leaacv SL Equipment D 5 100 06H+0.71" 33%

SG Row Col Location %TW D 13 4 01C+0.41" 24%

A 1 87 TSC+18.85" 29%

D 21 52 04H-0.41" 25%

A 1 36 TSC+18.09" 26%

A 1 11 01 C-1.68" 21%

Table 3c B 1 11 TSC+18.45" 32%

OR21 Indications from TSP Wear B 1 87 TSH+18.32" 36% SG Row Col Location %TW B 1 87 TSC+18.32" 39%

A 4 87 06C-0.5 10%

B 1 112 TSH+18.35" 14%

A 5 108 06C-0.58 15%

B 1 119 01H+16.16" 14%

A 11 76 06C-0.8 17%

c 1 87 TSH+17.94" 33%

A 12 97 05C-0.72 16%*

c 1 87 TSC+17.94" 13%

A 18 82 06C-0.62 9%

c 1 112 TSH+18.36" 22%

A 22 95 08H-0.43 12%*

c 1 112 TSC+18.55" 13%

A 34 61 04H-0.46 13%*

D 1 87 TSH+18.42" 32%

A 36 93 03H-0.78 15%*

B 2 110 06C-0.71 24%*

Table 3b OR21 Indications from Foreiqn Object Wear B 5 86 04H-0.42 13%

SG Row Col Location %TW B 22 97 05H-0.56 24%

A 21 26 03H-0.64" 22% c 3 90 07C-0.64 24%

A 35 80 03H-0.46" 35% c 4 74 04C-0.46 17%*

A 35 88 03H-0.96" 25% c 5 57 06C-0.64 23%

A 49 29 TSH+0.16" 25% c 6 39 06C-0.47 26%

A 50 29 TSH+0.12" 14%

c 7 98 05C-0.71 11%*

A 53 33 TSH+0.33" 11%

c 9 97 06C-0.70 7%*

B 2 98 06C-0.83" 32%

c 32 24 04H-0.40 30%

B 2 113 07H+1.07 22%

D 1 20 06C-0.45 28%*

B 43 96 TSH+0.06" 17%

D 5 100 06H+0.71 28%

B 54 87 01 C+0.57" 21%

c 3 113 05C-0.80" 30% D 6 108 03H-0.41 10%

c 28 104 05C-0.63" 25% D 36 41 04H-0.45 30%*

c 32 35 07C+19.45" 7% D 42 19 03C+0.20 9%

c 39 19 TSC+4.05" 16% D 43 49 05H-0.78 21%*

c 43 26 TSH+0.07" 19% D 44 100 05H-0.76 24%*

c 44 26 TSH+0.12" 8%

• Newly reported in OR21.

SBK-L-22036 E. Number of tubes plugged during the inspection outage for each degradation mechanism Two tubes were plugged based on the OR21 inspection. Tubes plugged for each degradation mechanism are summarized below in Table 4:

Table 4 - OR21 Tubes Plugged SG Tube Dearadation Mechanism Location Notes OSH+0.14, Two SAls on one tube. TSP quatrefoil 8 R8C116 Axial ODSCC (SAls) at TSP OSH-0.2 flow holes partially occluded.

Axial ODSCC at Expansion In the sludge pile region.

c R25C51 Transition TSH-0.2 F. Number and percentage of tubes plugged to date, and the effective plugging percentage in each steam generator The number and percentage of SG tubes plugged to-date, and the effective plugging percentage in each SG are summarized in Table 5.

Table 5 - Tubes plugged to-date and effective plugging percentage SG-A SG-8 SG-C SG-D Total Tubes Plugged 43 40 66 65 214 Percent Plugged 0.76% 0.71% 1.17% 1.16% 0.95%

G. Results of Condition Monitoring, including the results of tube pulls and in-situ testing All indications found in OR21 satisfy the condition monitoring (CM) requirements of NEI 97-06 for structural and leakage integrity. No indications were found to exceed structural limits. The tubes identified for plugging were screened against the in-situ test selection criteria contained in the EPRI SGMP Steam Generator In Situ Pressure Test Guidelines Rev 5 and provided for Seabrook conditions. None of the tubes identified for plugging met the requirements for in-situ testing. CM verification in OR21 justified operation for Cycle 21 for all existing degradation mechanisms by comparison to the OR20 OA predictions. The OR21 inspection results validate the projections and conclusions of the previous inspection in OR20.

1. ODSCC Indications:

- A single axial indication (SAi) was found during the array probe exam on a tube at the sludge pile and expansion transition region in SG-C at R25C51. The ODSCC indication was confirmed using the +Point' probe as well as the Ghent probe. The flaw was assessed for in-situ testing. The lowest 95/50 predicted burst pressure was found to be 4555 psi with a ligament tearing pressure of 4509 psi, which exceeds the 3xNODP pressure differential for Seabrook of 3860 psid. The indication met the screening criteria for burst and leak testing and met CM requirements. No tube pulls were performed. A more detailed discussion of the CM screening applied is documented in Appendix B.

- Two (2) single axial indications (SAls) were found during the array probe exam on a tube at the uppermost TSP location in SG-B at R8C116. The ODSCC indications were confirmed using the +Point' probe as well as the Ghent probe. The flaws were assessed for in-situ testing. The lowest predicted 95/50 burst pressure was found to be 6211 psi with a ligament tearing pressure of 6211 psi (which exceeds the 3xNODP pressure differential for Seabrook of 3860 psid). Since the indications had 95/50 burst pressures greater than the limiting differential pressure, the screening criteria for burst and leak testing were met as well as CM requirements. No tube pulls were performed. A more detailed discussion of the CM screening applied is documented in Appendix B.

SBK-L-22036

2. The maximum observed AVB wear indication (39%TW) in OR21 was less than the CM limit of 70.7%TWfor AVB wear. In addition, the largest new AVB wear indication detected in OR21 was 21%TW, which was smaller than the predicted new indication of 27.8%. Therefore, AVB wear met the CM requirements with 95% probability at 50% confidence, (when all uncertainties are considered at their 95% probability values).

3. The maximum observed volumetric indication (indicative of mechanical wear) was 39% TW.

The indication has shown no growth for the last several cycles and is less than the CM limit (51 %TW) when all uncertainties are considered. All volumetric indications met the CM requirements with 95% probability at 50% confidence.

4. The maximum wear observed during the OR21 inspection due to foreign objects (FOs) was 35% TW. The CM limit for FO wear is 57.8% TW. Therefore, wear due to foreign objects met the performance requirements for Condition Monitoring.

5. Misc. Special Interest:

- One PLP signal was newly reported in OR21, with no associated wear.

- During the inspection of BLG and OXP indications with the array probe, no evidence of any new degradation was found.

- sec was not reported on non-high stress tubes that had support plate residual signals.

6. The predicted accident induced leakage for H* met the Condition Monitoring leakage requirements. In SG-B, in which operating leakage has been observed, the predicted leakage from the tubesheet expansion region is 1. 77 gpd or 0.0012 gpm (see Section I). No leakage was detected from the SCC indications in SG-B. SGs A, C and D are free from indications with the potential to leak and have no reportable normal operating leakage. Therefore, the Seabrook SGs met the Condition Monitoring requirements for leakage.

7. Channelhead Components Visual Inspection:

- Tube Plug Inspection: During the inspection of tube plugs in OR21, all installed plugs were confirmed to be in their correct location. In addition, all plugs were found to be dry; no dripping plugs were identified. No degradation or visible signs of leakage were noted on the plugs during the visual inspection.

- Other Channelhead Inspections: Visual inspection of various channelhead components were performed to identify degradation per guidance in Westinghouse NSAL 12-1 Rev 1, "Steam Generator Channel Head Degradation" and LR-ISG-2016-01, "Changes to Aging Management Guidance for Various Steam Generator Components." Areas inspected include the divider plate-to-channel head weld, the weld at the top of the channel head bowl drain tube, the channelhead-to-tubesheet girth weld seam region, the divider plate, and all cladded surfaces of the channelhead bowl and tubesheet. The anomaly identified in the surface of the channel head cladding in the CL of SG-B in OR20 4 was re-inspected. There appears to be no change in this anomaly in OR21 from when it was first reported. The anomaly will be monitored in future remote visual inspections for noticeable changes. No other degradation was found during the visual inspection of channelhead components in OR21.

8. Secondary-Side Inspection (SSI) & Maintenance:

- Sludge lancing and FOSAR: A total of approximately 132.6 lbs. of sludge was removed from the 4 SGs based on sludge lancing in OR21. There was evidence of some hard sludge/scale during TTS in-bundle exams of the sludge pile region. Eight (8) foreign objects were identified during FOSAR activities at the TTS of which 3 were metallic in nature. Two of the metallic pieces were legacy items: a previously reported dumbbell-shaped object, and a hollow metal fitting identified in OR 19 in SG-D. The third metallic object was characterized by the SSI team as possibly a piece of gasket material. The remaining 5 FOs were small pieces of tube scale and sludge rocks which are not potentially damaging to the 4 Reference Section G6 of the OR20 SG Tube Inspection Report (NRC ADAMS Accession No. ML20295A551 ).

SBK-L-22036 tubes. No FOs were retrieved; however, a FO evaluation was completed for all objects found during FOSAR which were not retrieved. No tube damage was observed in any SG during FOSAR activities.

- Upper Internals Inspection: Visual inspections performed in SG-8 (for erosion/corrosion, mechanical damage, foreign material, and unusual conditions) included the dryers, primary moisture separators, swirl vanes, feedring and J-nozzles. A band of discoloration was observed on the wall of the steam drum, just above the feedring. This appears to have been caused by a thin layer of magnetite that had spalled from the wall in this region; however, the base material appears to be intact. A minimal amount of erosion was observed inside some of the J-tubes at the interface with the feedring; the condition was typical as observed in prior outages. No loose parts, foreign objects or broken welds were found during the USO exams.

H. Primary-to-secondary leakage rate observed in each SG during the previous cycle Seabrook has tracked detectable normal operating leakage in SG-8 that has varied between 0.23 gpd and 0.71 gpd during the fuel cycle preceding the OR21 inspection. This low level of leakage has been detected for several cycles, fluctuating between O and 1.2 gpd. No normal operating leakage has been detected in SG-A, SG-C, or SG-D.

I. Calculated accident induced leakage rate For application of H*, Seabrook committed that the component of operational leakage from the prior cycle from below the H* distance will be multiplied by a factor of 2.49 and added to the total accident leakage from any other source and compared to the allowable accident-induced leakage limit.

The assumed value for accident-induced leakage in the Seabrook UFSAR is 500 gpd (=0.35 gpm) for the faulted SG and 940 gpd through the remaining three SGs, for a total leakage of 1440 gpd

(=1.0 gpm). As stated in Section H, SG-B experienced leakage in the range of 0.23 gpd to 0.71 gpd in the fuel cycle preceding the OR21 inspection. Since there is no observed operating leakage from the remaining SGs (SG-A, SG-C and SG-D), the predicted accident-induced leakage for each of these is zero. No leakage was detected from the SCC indications in SG-8 or SG-C; this is supported by primary-to-secondary leak trends in SG-B which show similar levels before and after OR21. Since there is no other degradation mechanism in SG-B that has been shown to be the source of the observed normal operating leakage, the entire observed operating leakage is assumed to come from the tubesheet expansion region. Conservatively assuming that the operating leakage in SG-8 is at the upper end of the observed range (i.e. 0.71 gpd), the predicted accident-induced leakage (OosA) in SG-B is:

OosA = 2.49 x 0. 71 gpd = 1. 77 gpd (=0.0012 gpm)

Therefore, since the predicted accident-induced leakage from SG-B (1. 77 gpd) is less than the assumed accident-induced leakage limit in the Seabrook UFSAR (500 gpd) for leakage through the faulted SG, and less than the total leakage limit for all SGs (1440 gpd), the accident-induced leakage performance criteria for Condition Monitoring are met.

J. Results of monitoring for tube axial displacement (slippage)

A condition for licensing H* was to monitor for tube slippage within the tubesheet region. Monitoring for slippage was accomplished in accordance with the slippage monitoring guidance provided in Westinghouse LTR-SGMP-09-140 "H*: Guidance for Monitoring Tube Slippage Using the Bobbin Probe Data", September 22, 2009 (proprietary). No tube slippage was detected during the OR21 inspection.

SBK-L-22036 Appendix A - Additional Information References to prior SG Tube Inspection Reports (3rd and 4th inspection periods)

Inspection# EOC Outaqe NRC ADAMS Accession No.

1 EOC-15 OR15 ML13008A160 2 EOC-16 OR16 ML14297A090 3 EOC-17 OR17 ML16120A203 4 EOC-18 OR18 ML17291B270 5 EOC-19 OR19 ML19109A214 6 EOC-20 OR20 ML20295A551 Abbreviations and Acronyms:

AVB Anti Vibration Bar NSAL Nuclear Safety Advisory Letter BLG Bulge OA Operational Assessment CL Cold Leg OD Outside Diameter CM Condition Monitoring ODS CC OD Stress Corrosion Cracking DA Degradation Assessment OXP Over-expansion DBA Design Bases Accident Per Percent Through-Wall DNG Ding PLP Possible Loose Part DNT Dent POB Probability of Burst ECT Eddy Current Testing POL Probability of Leakage EFPM Effective Full Power Months PWSCC Primary Water SCC EFPY Effective Full Power Years SAi Single Axial Indication EOC End-Of-Cycle sec Stress Corrosion Cracking EPRI Electric Power Research Institute SG Steam Generator ETSS Exam Technique Spec Sheet SGMP SG Management Program FDB Flow Distribution Baffle SL Sludge lancing FO Foreign Object SSI Secondary-side inspection FOSAR Foreign object search & recovery TS Tubesheet GPD (gpd) Gallons per Day TSC Tube Sheet Cold GPM (gpm) Gallons per Minute TSH Tube Sheet Hot HL Hot Leg TSP Tube Support Plate MNT Maintenance Related TTS Top of Tube Sheet NDD No Degradation Detectable TW Through Wall NEI Nuclear Energy Institute UFSAR Updated Final Safety Analysis Rpt NOPD Normal operating pressure differential VOL Volumetric

SBK-L-22036 Appendix B - OR21 Axial ODSCC Indications Axial ODSCC indication at the Expansion Transition :

The axial ODSCC indication at the sludge pile and expansion transition region in SG-C at R25C51 was detected during the array probe inspection. The +Point' probe exam at this location confirmed the crack-like indication (SAi). Use of the Ghent probe also confirmed the presence of a crack-like indication (SAi). The tube does not belong to the population of "high stress tubes" and there were no dents, bulges, or over-expansions at this location. A lookback review performed of past ECT data showed no precursor signals at this location. The indication was assessed regarding the need for in-situ testing. The flaw had a measured length of 0.27 inches and a maximum depth of 81 .52% TW (Table 2) . Line-by-line depth profiling was performed for this indication; the depth profile is shown in the chart below. The flaw was profiled using the guidance of ETSS 1-28431 . This depth profile information was used as input, along with the Seabrook-specific tube material properties in determining structural equivalent length and depth values of 0.176 inches and 65.31 %TW, respectively.

The lowest 95/50 predicted burst pressure was found to be 4555 psi with a ligament tearing pressure of 4509 psi, which exceeds the 3xNODP pressure differential for Seabrook of 3860 psid. The previous OA (OR20) assumed 2 undetected flaws for two cycles with a 95/50 burst pressure of 4974 psi, and a POB and POL of 0.643% and 0.471 %, respectively. The calculated burst pressure value for the OR21 ODSCC indication is 6962 psi, with no reported burst or leak, with one detected flaw. Thus, the structural integrity performance criteria and condition monitoring criteria are satisfied.

Seabrook OR21 SG C R25C51 TSH -0.2 Ax ial ODSCC Flaw Profile 90 80 70 60 3

~so

.c:

0"'

E E40

• ~

2 30 20 10 0

-0.45 *0.4 -0.35 -0.3 *0.25 *0.2 *0. 15

_J -0.1 Loca t ion Measured from Top of Tubesheet {Inch)

SBK-L-22036 Appendix 8 - OR21 Axial ODSCC Indications Axial ODSCC indications at a TSP location:

The 2 axial ODSCC indications on one tube (R8C116) at the uppermost TSP location in SG-B were initially detected during the array probe inspection. The +Point' probe exam at this location confirmed the crack-like indications (SAls). The Ghent probe also confirmed the presence of the crack-like indication (SAls). The tube does not belong to the population of "high stress tubes" and there were no dents at this location. This location had not previously been examined with an enhanced probe and a lookback review of the past bobbin probe data showed no precursor signals at this location. A deposit mapping image and C-scan plots showed that two of the quatrefoil flow holes were occluded, and the axial crack-like indications pair with a deposit loejded quatrefoil flow hole. It is likely the deposits in the flow holes created the environment which made this specific location have an increased risk of stress corrosion cracking at the TSP. The indication was assessed regarding the need for in-situ testing. The flaw sizes are as shown in Table 2. Line-by-line depth profiling was performed for these indications; the depth profiles are shown in the 2 charts below. The flaws were profiled using the guidance of ETSS 1-28432.

This depth profile information was used as input, along with the Seabrook-specific tube material properties in determining structural equivalent length/depth values of 0.19 inches and 31.1 % TW (for the flaw at 08H+0.14), and 0.08 inches and 38.64%TW (for the flaw at 08H-0.2).

The lowest predicted 95/50 burst pressure was found to be 6211 psi with a ligament tearing pressure of 6211 psi (which exceeds the 3xNODP pressure differential for Seabrook of 3860 psid). This value was found from the deeper of the two flaws (46.35%TW) . These indications were evaluated separately, and as one indication (Ref. last row of Table 2), the most bounding condition was used for the evaluation.

Per the EPRI Guidelines, the 2 indications should be treated as one large indication since the distance between the crack tips is ::; 0.25 inches. In this way, the more limiting case for a single indication was used for conservatism. This evaluation bounds the other crack-like indication found at this location. The previous OA (OR20) assessed the integrity of axial ODSCC at TSPs. It calculated a POB of 1.593%,

POL of 2.369% and a 95/50 burst pressure of 4569 psi for 5 undetected flaws . These met all acceptance criteria for burst and leakage. Therefore, the OR20 OA prediction is found to be conservative compared to the 2 axial ODSCC indications at TSPs reported in OR21 .

Se abrook OR2 l SG B R8Cll6 0 8H +0.14 Axial ODSCC Flaw Profile JO 35

.10 Q.

~ 20 E

E x

~ IS 10 '

I 5 t

°'--*--- -

0.1 0.15 02 0.25 Location Measured From Center of 08H {Inch) 03 0.35 0.4

SBK-L-22036 Appendix B - OR21 Axial ODSCC Indications Seabrook OR21 SG B R8C116 08 H -0.21 Axial ODSCC Flaw Profi le 50 10

• 0.21 -0.19 017 -0.15 .QlJ *0.U 0.09 -0.07 -0.05 locat ion Measured From Cen ter ot OSH (Inch)

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts A 1 11 21 01C 0.69 A 27 12 16 AV6 0.62 A 31 68 15 AV2 0.53 A 1 36 26 TSC 0.22 A 27 63 14 AV2 0.57 A 31 69 15 AV5 0.58 A 1 87 29 TSC 0.26 A 27 112 16 AV1 0.55 A 31 105 14 AV1 0.45 A 4 87 10 06C 0.19 A 27 112 14 AV5 0.45 A 32 89 18 AV1 0.61 A 5 108 15 06C 0.3 A 28 44 18 AV2 0.73 A 32 89 17 AV3 0.56 A 11 76 21 06C 0.15 A 28 44 17 AV5 0.7 A 33 14 15 AV1 0.58 A 12 97 20 05C 0.14 A 28 59 26 AV2 1.27 A 33 14 15 AV2 0.56 A 17 67 16 AV1 0.56 A 28 59 21 AV5 0.95 A 33 15 15 AV4 0.55 A 17 71 14 AV1 0.51 A 29 11 21 AV2 0.9 A 33 15 22 AV5 0.98 A 18 58 16 AV1 0.65 A 29 71 14 AV2 0.47 A 33 15 18 AV6 0.72 A 18 82 9 06C 0.16 A 29 82 22 AV2 0.9 A 33 71 16 AV1 0.6 A 19 40 27 AV1 1.38 A 29 82 12 AV6 0.56 A 33 71 16 AV2 0.6 A 19 54 23 AV1 1.03 A 29 84 15 AV5 0.47 A 33 92 17 AV1 0.67 A 19 58 18 AV1 0.73 A 29 84 12 AV6 0.38 A 33 106 16 AV1 0.59 A 19 61 14 AV1 0.51 A 29 94 26 AV2 1.12 A 34 17 12 AV3 0.42 A 19 61 10 AV6 0.33 A 30 11 22 AV5 1.02 A 34 17 16 AV6 0.63 A 20 48 17 AV1 0.68 A 30 11 15 AV6 0.58 A 34 51 23 AV2 1.08 A 21 26 22 03H 0.16 A 30 12 14 AV1 0.56 A 34 51 24 AV3 1.15 A 22 95 12 08H 0.3 A 30 12 19 AV5 0.79 A 34 59 16 AV2 0.63 A 23 36 11 AV1 0.42 A 30 12 16 AV6 0.61 A 34 59 14 AV3 0.54 A 23 37 14 AV6 0.54 A 30 31 17 AV5 0.68 A 34 61 21 04H 0.15 A 23 38 14 AV2 0.54 A 30 58 21 AV5 0.9 A 34 87 19 AV3 0.77 A 23 42 17 AV6 0.71 A 30 58 19 AV6 0.79 A 34 87 22 AV4 0.93 A 23 45 16 AV5 0.67 A 30 64 18 AV2 0.75 A 34 94 14 AV1 0.47 A 23 45 10 AV6 0.38 A 30 64 16 AV5 0.61 A 34 95 15 AV3 0.55 A 23 52 17 AV2 0.72 A 30 68 12 AV1 0.39 A 34 97 21 AV2 0.89 A 23 52 14 AV5 0.53 A 30 68 15 AV2 0.56 A 34 103 15 AV1 0.53 A 23 59 21 AV2 0.94 A 30 89 13 AV2 0.4 A 35 14 19 AV2 0.77 A 23 59 19 AV5 0.8 A 30 95 18 AV6 0.62 A 35 14 13 AV4 0.49 A 23 61 9 AV2 0.34 A 30 98 15 AV1 0.46 A 35 14 18 AV5 0.7 A 24 7 16 AV1 0.63 A 30 102 13 AV5 0.37 A 35 14 11 AV6 0.4 A 24 7 17 AV6 0.66 A 30 109 14 AV1 0.43 A 35 31 19 AV3 0.76 A 24 59 20 AV2 0.84 A 30 109 16 AV5 0.52 A 35 31 19 AV5 0.75 A 24 59 18 AV5 0.76 A 30 109 17 AV6 0.57 A 35 55 16 AV2 0.6 A 24 59 16 AV6 0.64 A 30 111 15 AV1 0.56 A 35 55 15 AV4 0.57 A 24 71 13 AV2 0.47 A 30 111 18 AV5 0.73 A 35 61 14 AV1 0.51 A 24 71 16 AV5 0.6 A 30 111 11 AV6 0.4 A 35 61 19 AV2 0.8 A 25 7 19 AV1 0.78 A 31 11 16 AV2 0.6 A 35 61 23 AV3 1.02 A 25 56 17 AV2 0.72 A 31 11 21 AV5 0.87 A 35 61 38 AV4 2.47 A 25 59 15 AV2 0.59 A 31 12 34 AV5 1.97 A 35 61 33 AV5 1.87 A 25 68 15 AV1 0.48 A 31 12 22 AV6 0.95 A 35 61 18 AV6 0.7 A 25 83 20 AV2 0.74 A 31 13 18 AV6 0.75 A 35 70 16 AV2 0.64 A 26 107 32 AV6 1.75 A 31 64 15 AV2 0.54 A 35 73 26 AV2 1.14

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts A 35 73 17 AV3 O.G7 A 41 35 10 AV3 0.34 A 42 58 lG AV4 O.GG A 35 80 35 03H 0.3G A 41 50 lG AVl O.G7 A 42 58 15 AV5 O.G A 35 88 25 03H 0.2 A 41 50 15 AV2 0.53 A 42 72 17 AVl O.G3 A 35 96 lG AV2 0.5G A 41 50 20 AV3 0.85 A 42 72 22 AV2 0.8G A 3G 93 20 03H 0.14 A 41 50 24 AV4 1.07 A 42 72 35 AV3 2.0G A 3G 109 17 AV2 O.GG A 41 50 34 AV5 1.95 A 42 72 31 AV4 1.73 A 3G 110 13 AV2 0.4G A 41 53 17 AVl O.G4 A 42 72 32 AV5 1.77 A 37 87 15 AV2 0.51 A 41 53 lG AV2 O.G A 42 72 17 AVG O.G8 A 37 99 13 AVl 0.43 A 41 53 19 AV3 0.74 A 42 80 13 AVl 0.47 A 37 99 20 AV3 0.81 A 41 53 27 AV4 1.33 A 42 80 30 AV2 1.G4 A 37 99 15 AV4 0.51 A 41 53 2G AV5 1.28 A 42 80 34 AV3 1.91 A 37 102 21 AVl 0.82 A 41 54 21 AV2 0.92 A 42 80 24 AV4 1.03 A 37 102 14 AV4 0.53 A 41 54 2G AV3 1.22 A 42 80 20 AV5 0.84 A 37 102 17 AV5 O.G8 A 41 54 15 AV5 0.55 A 42 80 30 AVG 1.4G A 37 105 18 AVl O.G8 A 41 58 8 AVl 0.29 A 42 81 20 AV4 0.84 A 37 105 22 AV4 0.88 A 41 58 14 AV2 0.49 A 42 83 14 AV2 0.54 A 37 105 13 AV5 0.42 A 41 58 17 AV3 O.G7 A 42 103 22 AVl 0.8G A 39 G3 lG AV2 0.59 A 41 58 19 AV4 0.78 A 43 20 15 AVG 0.59 A 39 G3 19 AV3 0.75 A 41 58 15 AV5 0.57 A 43 55 21 AV2 0.91 A 39 79 15 AV2 0.55 A 41 59 24 AV2 1.09 A 43 98 lG AV5 O.G2 A 39 79 19 AV3 0.79 A 41 59 18 AV3 0.71 A 44 GG 15 AVl 0.53 A 39 79 25 AV4 1.2G A 41 59 12 AV5 0.42 A 44 94 13 AV2 0.47 A 39 79 24 AV5 1.15 A 41 G8 19 AV2 0.82 A 44 94 lG AV3 O.G3 A 39 80 25 AV3 1.23 A 41 G8 3G AV3 2.21 A 44 94 15 AV4 0.55 A 40 71 2G AV2 1.lG A 41 G8 2G AV4 1.31 A 44 98 17 AVl 0.72 A 40 8G 18 AVl 0.72 A 41 G8 25 AV5 1.lG A 44 98 22 AV2 0.98 A 40 8G 22 AV2 1 A 41 G8 18 AVG 0.75 A 44 98 25 AV3 1.22 A 40 8G 14 AV4 0.44 A 41 78 14 AV2 0.45 A 44 98 18 AV4 0.75 A 40 8G 12 AV5 0.39 A 41 78 23 AV3 1.0G A 44 98 17 AV5 O.GG A 40 87 21 AV3 0.81 A 41 78 13 AV5 0.44 A 44 100 17 AVl 0.71 A 40 87 19 AV4 0.71 A 41 84 14 AV2 0.53 A 44 100 19 AV2 0.8 A 40 91 18 AV2 O.G4 A 41 84 15 AV4 0.5G A 44 100 lG AV3 O.Gl A 40 91 15 AV4 0.58 A 41 91 14 AVl 0.5G A 44 100 17 AV5 O.G9 A 40 93 19 AV2 0.72 A 41 91 18 AV2 0.72 A 44 101 17 AVl O.G8 A 40 94 20 AV2 0.85 A 41 102 18 AVl 0.72 A 44 102 15 AV2 0.5G A 40 94 17 AV4 0.59 A 41 102 21 AV4 0.89 A 45 G7 19 AV2 0.89 A 40 9G 13 AVl 0.4G A 41 102 21 AV5 0.84 A 45 G8 17 AV2 0.74 A 40 102 lG AVl 0.58 A 41 103 19 AVl 0.84 A 45 74 17 AVl 0.73 A 40 102 lG AV3 0.58 A 41 103 13 AV3 0.5 A 45 74 15 AV2 O.Gl A 40 102 21 AV4 0.87 A 41 103 21 AV4 0.98 A 45 74 27 AV3 1.49 A 40 103 19 AVl 0.82 A 41 103 22 AV5 0.97 A 45 74 30 AV4 1.73 A 40 103 15 AV3 0.55 A 41 103 14 AVG 0.52 A 45 7G 11 AVl 0.45 A 40 103 27 AV4 1.31 A 42 22 13 AV4 0.47 A 45 80 14 AV3 0.57 A 40 103 25 AV5 1.27 A 42 58 27 AV3 1.35 A 45 80 lG AV4 0.7

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts SG Row Col Per Loc'n Volts A 45 98 14 AV4 0.59 A 48 94 15 AV4 0.54 A 50 85 18 AV5 0.73 A 46 65 23 AV4 1.01 A 48 94 16 AV5 0.61 A 50 85 22 AV6 0.86 A 46 65 29 AV5 1.51 A 48 94 17 AV6 0.66 A 50 88 26 AV6 1.13 A 46 71 14 AV3 0.49 A 48 95 16 AV4 0.61 A 50 95 22 AV3 0.91 A 46 71 18 AV4 0.72 A 48 95 19 AV5 0.76 A 50 95 22 AV4 0.98 A 46 71 22 AV5 0.93 A 48 95 22 AV6 0.93 A 50 95 34 AV5 2.03 A 46 77 19 AV2 0.75 A 48 96 23 AV6 0.96 A 50 95 31 AV6 1.58 A 46 77 14 AV3 0.5 A 49 28 13 AV2 0.43 A 51 52 11 AV4 0.36 A 46 77 25 AV4 1.17 A 49 29 25 TSH 0.2 A 51 53 8 AV4 0.31 A 46 94 11 AV6 0.36 A 49 48 12 AVl 0.41 A 51 71 15 AV4 0.51 A 46 95 13 AV4 0.46 A 49 54 12 AV3 0.39 A 51 75 20 AV5 0.78 A 46 95 23 AV5 1 A 49 57 15 AV2 0.65 A 51 77 18 AV4 0.7 A 46 95 23 AV6 1.03 A 49 57 13 AV4 0.54 A 51 86 18 AVl 0.64 A 46 97 11 AV6 0.36 A 49 57 12 AV5 0.5 A 51 86 28 AV2 1.36 A 46 98 23 AV4 1.03 A 49 57 14 AV6 0.59 A 51 86 20 AV3 0.77 A 46 98 20 AV5 0.84 A 49 60 12 AV3 0.41 A 51 86 21 AV4 0.8 A 46 98 15 AV6 0.54 A 49 64 22 AVl 0.98 A 51 86 18 AV6 0.67 A 47 85 19 AV5 0.85 A 49 65 17 AVl 0.69 A 51 90 17 AV2 0.66 A 47 89 18 AV3 0.8 A 49 65 22 AV2 1.01 A 51 90 19 AV3 0.79 A 47 89 15 AV6 0.61 A 49 65 38 AV3 2.49 A 51 90 22 AV4 0.98 A 47 95 12 AVl 0.47 A 49 65 27 AV4 1.38 A 51 90 22 AV5 0.94 A 47 95 17 AV2 0.75 A 49 65 20 AV5 0.85 A 51 90 21 AV6 0.79 A 47 95 22 AV3 1.07 A 49 76 23 AV2 1.07 A 52 53 12 AV2 0.48 A 47 95 20 AV4 0.94 A 49 88 14 AV2 0.5 A 52 57 15 AV3 0.62 A 47 95 14 AV5 0.6 A 49 88 18 AV3 0.76 A 52 73 23 AV3 0.92 A 47 95 17 AV6 0.74 A 49 88 27 AV4 1.35 A 52 73 21 AV5 0.84 A 47 98 15 AV5 0.65 A 49 88 30 AV5 1.6 A 52 88 18 AV3 0.64 A 48 31 18 AV3 0.73 A 49 88 17 AV6 0.68 A 52 88 32 AV4 1.7 A 48 31 18 AV4 0.72 A 49 90 14 AV5 0.51 A 52 88 29 AV5 1.42 A 48 31 14 AV5 0.54 A 49 90 19 AV6 0.78 A 52 88 23 AV6 0.96 A 48 31 17 AV6 0.7 A 49 91 13 AV5 0.5 A 52 89 13 AV3 0.47 A 48 60 20 AV6 0.82 A 50 29 14 TSH 0.08 A 52 89 28 AV4 1.39 A 48 63 15 AVl 0.53 A 50 38 17 AV4 0.66 A 52 89 33 AV5 1.89 A 48 63 25 AV2 1.16 A 50 38 18 AV5 0.74 A 52 89 33 AV6 1.89 A 48 63 27 AV3 1.33 A 50 60 14 AV2 0.51 A 52 90 20 AV6 0.77 A 48 63 27 AV4 1.29 A 50 60 16 AV3 0.57 A 53 33 11 TSH 0.07 A 48 63 24 AV5 1.11 A 50 66 16 AV2 0.55 A 53 45 29 AV2 1.56 A 48 64 26 AV2 1.24 A 50 71 15 AV2 0.49 A 53 45 13 AV3 0.49 A 48 83 13 AV3 0.45 A 50 80 19 AV3 0.73 A 53 69 19 AV5 0.78 A 48 83 19 AV4 0.77 A 50 80 16 AV4 0.61 A 53 89 22 AVl 0.95 A 48 91 15 AV3 0.55 A 50 80 14 AV5 0.47 A 53 90 16 AV4 0.57 A 48 91 13 AV4 0.46 A 50 85 15 AV2 0.51 A 54 86 11 AV2 0.36 A 48 91 11 AV5 0.36 A 50 85 26 AV3 1.28 A 55 41 12 AV5 0.45 A 48 92 15 AV6 0.52 A 50 85 28 AV4 1.33 A 55 41 16 AV6 0.63

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Loc'n Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts A 5G 57 15 AV2 O.G5 B 22 89 19 AVG O.G5 B 29 101 18 AV2 O.G5 A 5G 81 17 AV4 0.59 B 22 97 24 05H 0.58 B 29 113 15 AV1 0.5G A 57 48 15 AV1 0.51 B 22 11G 12 AV2 0.38 B 29 113 18 AV5 O.G8 A 57 48 14 AV2 0.51 B 23 47 25 AV1 0.91 B 29 113 10 AVG 0.35 A 57 52 15 AV1 0.53 B 23 47 20 AV2 O.G2 B 30 43 11 AV2 0.42 A 57 Gl 13 AV2 0.52 B 23 49 18 AV1 0.53 B 30 43 20 AV5 0.89 A 58 50 14 AVG 0.5 B 23 49 12 AV2 0.3 B 30 43 15 AVG O.G3 A 58 7G 15 AV2 0.52 B 23 5G 14 AV1 0.49 B 30 49 13 AV2 0.5 A 58 7G 1G AV3 0.5G B 23 5G 17 AV2 O.G4 B 30 58 15 AV5 0.49 B 24 43 15 AV2 O.G5 B 30 Gl 2G AV2 1.14 B 24 43 12 AV5 0.48 B 30 Gl 38 AV5 2.28 B 24 45 13 AV2 0.51 B 30 G2 17 AV2 0.58 B 25 51 20 AV1 O.G2 B 30 GG 1G AV1 0.53 SG Row Col Per Locn Volts B 25 51 24 AV2 0.84 B 30 GG 14 AV2 0.49 B 1 11 32 TSC 0.39 B 25 51 2G AV5 1 B 30 GG 23 AV5 0.9 B 1 87 39 TSC 0.57 B 25 82 12 AV2 0.37 B 30 GG 10 AVG 0.3 B 1 87 3G TSH 0.5G B 25 112 1G AV1 0.55 B 30 71 13 AV5 0.42 B 1 112 14 TSH 0.15 B 27 42 24 AV2 0.83 B 30 73 15 AV2 0.5 B 1 119 14 01H 0.49 B 27 57 15 AV2 0.43 B 30 73 17 AV5 0.57 B 2 98 32 OGC 0.41 B 27 G3 1G AV5 0.49 B 30 75 29 AV2 1.3G B 2 110 24 OGC 0.24 B 27 81 13 AV5 0.39 B 30 75 23 AV5 0.9 B 2 113 22 07H 0.28 B 27 107 20 AV5 0.74 B 30 79 18 AV2 O.G4 B 5 8G 13 04H 0.29 B 27 112 13 AV1 0.42 B 30 79 13 AV5 0.4 B 12 G5 11 AV1 0.39 B 28 42 20 AV2 0.72 B 30 80 14 AV1 0.44 B 15 G8 14 AV1 0.43 B 28 42 18 AV5 O.G5 B 30 80 17 AV2 O.G B 1G 54 17 AV1 0.58 B 28 G5 11 AV2 0.31 B 30 80 19 AV5 O.G7 B 17 G4 14 AV1 0.48 B 28 G5 1G AV5 0.55 B 30 81 28 AV2 1.29 B 17 G9 13 AV1 0.39 B 28 G5 14 AVG 0.47 B 30 81 31 AV5 1.55 B 17 77 12 AV1 0.37 B 28 78 18 AV2 O.Gl B 30 87 18 AV2 O.G4 B 18 GG 17 AV1 0.57 B 28 115 10 AV2 0.31 B 30 87 29 AV5 1.39 B 18 74 14 AV1 0.4G B 28 115 17 AV5 0.59 B 30 87 20 AVG 0.77 B 19 GG 17 AV1 O.Gl B 29 30 15 AV2 0.52 B 30 10G 15 AV1 0.53 B 20 5G 18 AV1 O.G2 B 29 32 14 AVG 0.45 B 30 10G 1G AVG 0.57 B 20 GO 24 AV1 1.01 B 29 38 18 AV2 O.G7 B 30 109 17 AV5 O.G5 B 20 GO 17 AVG 0.72 B 29 38 21 AV5 0.82 B 30 111 18 AV2 O.G9 B 20 GO 20 AVG 0.73 B 29 38 14 AVG 0.41 B 30 111 23 AV5 1.03 B 21 G8 15 AV1 0.5 B 29 51 21 AV2 O.G8 B 30 112 14 AV1 0.45 B 21 77 1G AV1 0.53 B 29 79 28 AV1 1.23 B 30 112 22 AV2 0.9 B 21 115 15 AVG 0.52 B 29 79 2G AV2 1.09 B 30 112 19 AV5 0.71 B 22 3G 15 AV1 0.58 B 29 79 24 AV5 0.98 B 31 52 14 AV5 0.45 B 22 3G 14 AV2 0.51 B 29 79 14 AVG 0.43 B 31 111 27 AV5 1.2G B 22 3G 15 AVG 0.58 B 29 79 18 AVG 0.59 B 31 112 19 AV1 0.73 B 22 G9 15 AV1 0.51 B 29 89 17 AV1 O.G B 31 112 23 AV2 0.92 B 22 89 19 AV2 O.G5 B 29 89 19 AV2 0.71 B 32 81 14 AV2 0.47

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts B 32 82 22 AV2 0.83 B 34 105 17 AV6 0.64 B 39 48 20 AV3 0.72 B 32 82 18 AV5 0.64 B 35 44 19 AV1 0.65 B 39 48 17 AV4 0.56 B 32 82 14 AV6 0.45 B 35 44 18 AV2 0.63 B 39 48 19 AV5 0.65 B 32 83 14 AV2 0.47 B 35 55 21 AV3 0.77 B 39 49 18 AV1 0.67 B 32 83 18 AV3 0.63 B 35 55 18 AV4 0.63 B 39 49 24 AV2 1.04 B 32 83 18 AV5 0.62 B 35 58 16 AV2 0.55 B 39 49 32 AV3 1.62 B 32 86 16 AV2 0.55 B 35 58 24 AV3 0.97 B 39 49 22 AV4 0.86 B 32 86 19 AV3 0.68 B 35 58 24 AV4 1.02 B 39 54 13 AV1 0.41 B 32 86 17 AV4 0.6 B 35 58 16 AV5 0.54 B 39 54 22 AV2 0.89 B 32 88 13 AV1 0.38 B 35 59 16 AV1 0.55 B 39 54 26 AV3 1.12 B 32 88 19 AV2 0.64 B 35 59 19 AV2 0.69 B 39 54 27 AV4 1.23 B 32 88 24 AV3 0.88 B 35 59 16 AV3 0.54 B 39 54 20 AV5 0.72 B 32 88 12 AV4 0.33 B 35 59 17 AV4 0.62 B 39 56 11 AV1 0.32 B 32 88 18 AV5 0.59 B 35 67 22 AV2 0.89 B 39 56 14 AV2 0.44 B 32 103 19 AV2 0.78 B 35 67 21 AV3 0.81 B 39 57 10 AV1 0.27 B 32 109 20 AV5 0.81 B 35 67 18 AV4 0.65 B 39 57 17 AV2 0.6 B 32 109 14 AV6 0.49 B 35 68 9 AV1 0.21 B 39 57 14 AV3 0.44 B 33 95 18 AV2 0.65 B 35 68 17 AV2 0.5 B 39 57 15 AV4 0.48 B 33 104 20 AV2 0.74 B 35 68 24 AV3 0.82 B 39 57 11 AV5 0.33 B 33 104 19 AV4 0.69 B 35 68 26 AV4 0.94 B 39 59 19 AV1 0.71 B 33 107 12 AV3 0.41 B 35 68 28 AV5 1.13 B 39 60 13 AV1 0.42 B 33 107 20 AV5 0.82 B 35 71 17 AV3 0.57 B 39 60 15 AV2 0.48 B 33 109 16 AV4 0.6 B 35 98 17 AV3 0.6 B 39 60 25 AV3 1.07 B 33 109 31 AV5 1.61 B 35 98 17 AV4 0.64 B 39 60 12 AV4 0.36 B 34 14 17 AV5 0.57 B 35 104 14 AV3 0.47 B 40 74 10 AV2 0.29 B 34 14 19 AV6 0.65 B 35 104 15 AV6 0.5 B 41 61 20 AV2 0.71 B 34 70 20 AV2 0.73 B 36 59 20 AV2 0.66 B 41 61 24 AV4 0.94 B 34 70 13 AV3 0.4 B 36 59 13 AV6 0.36 B 41 61 21 AV5 0.77 B 34 70 14 AV4 0.44 B 36 64 17 AV3 0.53 B 41 75 22 AV2 0.91 B 34 72 16 AV2 0.54 B 36 64 19 AV4 0.61 B 41 75 23 AV3 0.96 B 34 82 12 AV2 0.36 B 36 65 33 AV2 1.55 B 41 75 20 AV4 0.79 B 34 85 12 AV2 0.35 B 36 65 22 AV3 0.77 B 41 75 13 AV5 0.45 B 34 85 13 AV6 0.42 B 36 65 15 AV4 0.44 B 42 64 12 AV2 0.49 B 34 94 18 AV2 0.64 B 36 65 21 AV5 0.87 B 42 64 9 AV5 0.32 B 34 94 16 AV5 0.54 B 37 54 15 AV2 0.51 B 42 81 20 AV2 0.77 B 34 94 14 AV6 0.46 B 37 54 17 AV3 0.59 B 42 103 15 AV4 0.51 B 34 98 15 AV2 0.51 B 37 54 20 AV4 0.72 B 43 20 13 AV2 0.46 B 34 98 20 AV3 0.8 B 37 58 14 AV3 0.48 B 43 69 19 AV2 0.72 B 34 100 18 AV5 0.67 B 37 69 23 AV2 0.88 B 43 69 18 AV3 0.67 B 34 100 17 AV6 0.6 B 37 87 14 AV2 0.47 B 43 69 26 AV4 1.2 B 34 101 15 AV2 0.5 B 37 87 16 AV3 0.56 B 43 69 28 AV5 1.33 B 34 101 13 AV6 0.43 B 38 41 9 AV6 0.34 B 43 75 26 AV2 1.19 B 34 103 15 AV5 0.56 B 39 21 19 AV6 0.64 B 43 75 21 AV3 0.87 B 34 103 21 AV6 0.86 B 39 48 11 AV2 0.33 B 43 75 32 AV4 1.65

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts B 43 75 29 AV5 1.42 B 55 69 14 AV2 0.4 c 25 10 8 AV1 0.24 B 43 96 17 TSH 0.19 B 55 69 14 AV3 0.4 c 25 56 16 AV2 0.59 B 44 62 9 AV2 0.34 B 56 69 17 AV2 0.58 c 26 8 17 AV1 0.62 B 44 62 11 AV4 0.42 B 56 71 13 AV2 0.4 c 27 115 13 AV2 0.46 B 45 27 13 AV6 0.4 B 56 82 21 AV5 0.84 c 28 66 15 AV2 0.58 B 45 33 18 AV2 0.63 B 57 50 16 AV6 0.57 c 28 66 13 AV5 0.49 B 45 41 20 AV2 0.74 B 57 69 17 AV2 0.53 c 28 104 25 05C 0.3 B 45 41 18 AV3 0.65 B 58 57 19 AV2 0.62 c 30 11 20 AV1 0.62 B 45 41 16 AV4 0.55 c 30 11 18 AV5 0.52 B 45 47 17 AV5 0.6 c 30 11 15 AV6 0.38 B 45 74 16 AV2 0.45 c 30 113 20 AV2 0.89 B 45 86 21 AV1 0.87 c 30 113 13 AV5 0.48 B 46 66 11 AV3 0.45 c 30 113 12 AV6 0.46 B 47 71 18 AV1 0.55 SG Row Col Per Locn Volts c 30 114 12 AV2 0.43 B 47 71 23 AV2 0.83 c 1 87 13 TSC 0.33 c 30 114 10 AV5 0.36 B 47 71 29 AV3 1.21 c 1 87 33 TSH 0.46 c 30 114 9 AV6 0.31 B 47 71 14 AV4 0.38 c 1 112 13 TSC 0.12 c 31 111 15 AV5 0.57 B 47 74 18 AV2 0.55 c 1 112 22 TSH 0.25 c 32 24 30 04H 0.79 B 48 25 16 AV5 0.51 c 3 90 24 07C 0.26 c 32 35 7 07C 0.07 B 48 71 9 AV4 0.26 c 3 113 30 05C 0.4 c 32 110 14 AV3 0.48 B 49 33 16 AV2 0.5 c 4 74 17 04C 0.65 c 33 42 19 AV4 0.75 B 49 78 16 AV2 0.58 c 5 57 23 06C 0.25 c 33 42 15 AV6 0.56 B 49 78 15 AV4 0.54 c 6 39 26 06C 0.34 c 33 106 14 AV2 0.51 B 50 93 14 AV2 0.48 c 7 98 11 05C 0.39 c 33 106 16 AV3 0.64 B 50 93 14 AV4 0.47 c 9 67 10 AV1 0.4 c 33 106 21 AV4 0.93 B 50 95 19 AV6 0.74 c 9 74 13 AV1 0.43 c 33 111 15 AV2 0.56 B 51 70 19 AV5 0.61 c 9 97 7 06C 0.24 c 33 111 17 AV5 0.68 B 51 70 25 AV6 0.95 c 10 63 17 AV1 0.67 c 34 28 15 AV4 0.53 B 53 34 23 AV6 0.8 c 10 63 15 AV6 0.55 c 34 28 14 AV5 0.44 B 53 44 10 AV6 0.3 c 10 64 14 AV1 0.53 c 35 13 15 AV1 0.53 B 53 90 13 AV3 0.45 c 11 67 12 AV1 0.51 c 35 13 30 AV2 1.45 B 53 90 16 AV4 0.55 c 11 72 16 AV1 0.59 c 35 13 15 AV3 0.51 B 53 90 25 AV5 1.08 c 14 62 12 AV1 0.42 c 35 13 27 AV4 1.24 B 53 90 15 AV6 0.53 c 15 35 12 AV1 0.39 c 35 13 34 AV5 1.84 B 54 36 15 AV5 0.42 c 15 64 14 AV1 0.53 c 35 13 20 AV6 0.78 B 54 66 10 AV3 0.29 c 15 67 16 AV1 0.71 c 35 43 13 AV2 0.47 B 54 86 17 AV2 0.63 c 16 37 15 AV6 0.56 c 36 43 12 AV2 0.41 B 54 86 12 AV4 0.4 c 19 59 15 AV1 0.49 c 37 17 18 AV5 0.62 B 54 86 14 AV5 0.5 c 19 62 15 AV1 0.58 c 37 23 12 AV1 0.43 B 54 87 21 01C 0.2 c 20 41 12 AV1 0.43 c 37 23 13 AV4 0.48 B 54 87 14 AV3 0.42 c 22 34 18 AV2 0.67 c 37 23 15 AV5 0.6 B 54 87 25 AV5 0.98 c 24 7 13 AV1 0.46 c 37 40 16 AV2 0.63 B 55 55 14 AV3 0.48 c 24 7 14 AV6 0.5 c 37 40 21 AV3 0.88 B 55 63 12 AV3 0.39 c 24 98 14 AV1 0.48 c 37 40 11 AV4 0.37

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts c 37 40 12 AV5 0.45 c 41 30 15 AV6 0.58 c 42 102 14 AVl 0.49 c 37 40 11 AV6 0.39 c 41 39 28 AV2 1.43 c 42 102 21 AV2 0.87 c 37 47 23 AV4 0.98 c 41 39 22 AV4 0.96 c 42 102 36 AV3 2.08 c 37 47 20 AV5 0.79 c 41 39 21 AV5 0.93 c 42 102 33 AV4 1.83 c 37 55 19 AV2 0.75 c 41 39 24 AV6 1.09 c 42 102 19 AV5 0.75 c 37 56 16 AV2 0.58 c 41 41 22 AVl 0.95 c 42 102 23 AV6 0.99 c 37 78 15 AV5 0.56 c 41 41 33 AV2 1.88 c 43 23 16 AVl 0.63 c 37 83 15 AV2 0.49 c 41 41 21 AV3 0.92 c 43 23 24 AV3 1.12 c 37 85 18 AV2 0.65 c 41 41 22 AV4 0.95 c 43 23 15 AV4 0.59 c 37 85 19 AV3 0.71 c 41 43 16 AV2 0.6 c 43 23 13 AV5 0.49 c 37 85 22 AV4 0.88 c 41 43 16 AV3 0.61 c 43 26 19 TSH 0.21 c 37 85 22 AV5 0.84 c 41 43 30 AV4 1.59 c 43 44 11 AV6 0.39 c 37 85 15 AV6 0.48 c 41 43 16 AV5 0.6 c 43 100 16 AV2 0.58 c 38 79 17 AVl 0.64 c 41 80 22 AV2 0.98 c 43 100 13 AV3 0.45 c 38 79 20 AV2 0.81 c 41 80 36 AV3 2.08 c 43 100 36 AV4 2.19 c 38 101 16 AV6 0.6 c 41 80 24 AV4 1.09 c 43 100 21 AV5 0.91 c 38 102 21 AV4 0.86 c 41 80 21 AV5 0.88 c 43 102 19 AV2 0.79 c 38 102 23 AV5 0.96 c 41 93 14 AVl 0.51 c 43 102 26 AV3 1.22 c 39 19 16 TSC 0.17 c 41 93 13 AV2 0.46 c 43 102 36 AV4 2.13 c 39 42 22 AV2 1 c 41 93 14 AV3 0.5 c 43 102 34 AV5 1.9 c 39 42 18 AV3 0.71 c 41 93 13 AV4 0.49 c 43 102 19 AV6 0.74 c 39 42 21 AV4 0.9 c 41 93 19 AV5 0.76 c 44 22 15 AV2 0.52 c 39 45 22 AV2 0.9 c 41 100 17 AV3 0.64 c 44 26 8 TSH 0.08 c 39 45 31 AV3 1.64 c 41 100 19 AV4 0.77 c 44 75 23 AVl 0.9 c 39 45 29 AV4 1.42 c 41 100 26 AV5 1.25 c 44 75 22 AV2 0.87 c 39 45 39 AV5 2.49 c 41 100 16 AV6 0.63 c 44 100 14 AV2 0.51 c 39 45 17 AV6 0.63 c 42 23 22 AV4 0.93 c 44 100 23 AV3 0.98 c 39 69 25 AV2 1.17 c 42 23 25 AV5 1.12 c 44 100 33 AV4 1.8 c 39 69 20 AV3 0.92 c 42 24 12 AV6 0.38 c 44 100 36 AV5 2.13 c 39 69 29 AV4 1.53 c 42 25 14 AV2 0.48 c 44 100 20 AV6 0.81 c 39 69 27 AV5 1.35 c 42 25 13 AV3 0.46 c 46 36 17 AV2 0.72 c 39 103 16 AV2 0.54 c 42 25 15 AV4 0.52 c 46 36 22 AV3 1.07 c 40 36 10 AVl 0.39 c 42 25 14 AV5 0.49 c 46 36 30 AV4 1.69 c 40 36 13 AV2 0.52 c 42 25 16 AV6 0.58 c 46 36 25 AV5 1.25 c 41 22 17 AV2 0.68 c 42 31 14 AVl 0.48 c 46 79 15 AV2 0.56 c 41 22 18 AV3 0.77 c 42 31 24 AV2 1.08 c 46 79 20 AV3 0.8 c 41 22 14 AV4 0.52 c 42 31 15 AV3 0.53 c 46 79 26 AV4 1.2 c 41 22 16 AV5 0.69 c 42 56 15 AV2 0.59 c 46 79 18 AV5 0.67 c 41 22 12 AV6 0.43 c 42 71 18 AV2 0.66 c 46 79 15 AV6 0.52 c 41 23 17 AVl 0.7 c 42 71 16 AV5 0.65 c 46 97 16 AV3 0.6 c 41 23 17 AV5 0.68 c 42 92 19 AV2 0.77 c 46 97 24 AV4 1.09 c 41 23 15 AV6 0.61 c 42 92 20 AV3 0.84 c 46 97 12 AV5 0.41 c 41 30 11 AV4 0.39 c 42 92 16 AV4 0.61 c 47 30 18 AV5 0.76 c 41 30 18 AV5 0.78 c 42 92 17 AV5 0.68 c 47 35 14 AVl 0.53

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts c 47 35 20 AV2 0.83 c 48 97 17 AV4 0.62 D 17 75 16 AV6 0.72 c 47 35 27 AV3 1.31 c 49 95 28 AV5 1.35 D 21 52 25 04H 0.27 c 47 35 28 AV4 1.4 c 51 49 17 AVl 0.76 D 22 86 12 AV2 0.53 c 47 35 14 AV5 0.54 c 51 49 22 AV2 1.07 D 22 93 15 AV2 0.58 c 47 40 14 AV2 0.54 c 51 49 10 AV3 0.37 D 22 93 16 AV6 0.68 c 47 40 13 AV3 0.49 c 51 67 15 AV4 0.56 D 24 6 16 AVl 0.76 c 47 40 20 AV4 0.84 c 51 67 16 AV6 0.64 D 24 6 18 AV6 0.88 c 47 40 18 AV5 0.71 c 53 33 14 AV3 0.47 D 24 89 11 AV5 0.47 c 47 40 17 AV6 0.68 c 53 35 13 AV2 0.44 D 24 89 9 AV6 0.37 c 47 57 14 AV2 0.5 c 53 35 14 AV4 0.47 D 24 91 10 AV2 0.42 c 47 62 13 AV4 0.46 c 53 63 19 AV2 0.8 D 24 116 10 AV5 0.41 c 47 76 18 AVl 0.69 c 53 67 14 AVl 0.5 D 25 82 18 AV2 0.93 c 47 76 18 AV2 0.7 c 53 67 34 AV2 1.96 D 25 82 15 AV5 0.74 c 47 83 17 AV5 0.68 c 53 67 36 AV3 2.15 D 26 8 15 AVl 0.72 c 47 86 15 AV4 0.58 c 53 67 25 AV4 1.22 D 26 8 17 AV6 0.82 c 47 86 20 AV5 0.8 c 53 70 17 AVl 0.7 D 26 40 9 AVl 0.33 c 47 93 8 AVl 0.27 c 53 70 24 AV2 1.12 D 26 40 16 AV5 0.7 c 47 93 20 AV3 0.83 c 53 70 16 AV3 0.64 D 26 41 14 AV2 0.59 c 47 93 25 AV4 1.13 c 54 35 15 AV4 0.56 D 26 41 11 AV5 0.45 c 47 93 34 AV5 1.89 c 54 37 19 AVl 0.81 D 26 52 11 AV2 0.45 c 47 94 13 AV2 0.49 c 54 39 17 AVl 0.67 D 26 83 10 AV2 0.39 c 47 94 15 AV3 0.56 c 54 68 23 AV2 0.99 D 26 114 10 AV2 0.3 c 47 94 23 AV4 0.99 c 54 87 11 AV3 0.38 D 27 8 10 AVl 0.41 c 47 94 16 AV5 0.6 c 54 87 18 AV4 0.71 D 27 8 22 AV6 1.15 c 47 94 17 AV6 0.66 c 54 87 26 AV5 1.17 D 27 36 13 AV5 0.5 c 47 96 12 AV3 0.4 c 55 39 15 AVl 0.57 D 27 39 31 AV2 1.65 c 47 96 16 AV5 0.59 c 56 65 17 AV3 0.63 D 27 39 37 AV5 2.31 c 47 96 11 AV6 0.37 c 58 51 17 AV6 0.67 D 27 39 19 AV6 0.82 c 47 98 14 AV3 0.48 c 59 67 15 AV6 0.53 D 27 44 25 AV2 1.19 c 47 98 17 AV4 0.66 D 27 76 10 AVl 0.41 c 47 99 18 AV4 0.69 D 27 76 15 AV2 0.71 c 47 99 32 AV5 1.68 D 27 76 18 AV5 0.89 c 47 99 29 AV6 1.49 D 27 89 12 AVl 0.54 c 48 30 14 AV4 0.48 D 27 89 10 AV2 0.43 c 48 30 15 AV5 0.53 SG Row Col Per Locn Volts D 27 96 14 AV5 0.64 c 48 30 16 AV6 0.6 D 1 20 28 06C 0.34 D 27 96 11 AV6 0.48 c 48 33 20 AV5 0.79 D 1 87 32 TSH 0.39 D 27 111 10 AV5 0.43 c 48 35 19 AV4 0.71 D 5 100 33 06H 0.41 D 27 115 17 AV2 0.83 c 48 35 14 AV5 0.48 D 6 108 10 03H 0.2 D 27 115 16 AV5 0.75 c 48 47 15 AVl 0.62 D 12 2 11 AVl 0.5 D 28 69 10 AV2 0.4 c 48 47 14 AV2 0.55 D 13 4 24 OlC 0.26 D 28 88 13 AV5 0.6 c 48 47 12 AV3 0.49 D 16 64 14 AVl 0.7 D 28 115 12 AV2 0.53 c 48 97 17 AV2 0.62 D 16 64 11 AV6 0.54 D 28 115 23 AV5 1.19 c 48 97 15 AV3 0.54 D 17 72 15 AVl 0.76 D 29 34 26 AV2 1.34

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts D 29 34 18 AV5 0.8 D 34 69 30 AV5 1.81 D 35 89 16 AV2 0.76 D 29 83 13 AV1 0.49 D 34 69 14 AV6 0.61 D 35 89 12 AV3 0.52 D 29 83 16 AV5 0.69 D 34 70 12 AV2 0.5 D 36 16 13 AV3 0.52 D 29 113 13 AV2 0.57 D 34 71 16 AV2 0.73 D 36 40 17 AV2 0.75 D 30 12 14 AV1 0.53 D 34 73 31 AV2 1.88 D 36 40 16 AV3 0.72 D 30 12 11 AV5 0.43 D 34 73 23 AV3 1.24 D 36 40 15 AV4 0.63 D 30 66 20 AV2 0.94 D 34 73 31 AV4 1.87 D 36 40 11 AV5 0.43 D 30 66 19 AV5 0.89 D 34 73 23 AV5 1.18 D 36 40 12 AV6 0.48 D 31 113 10 AV1 0.42 D 34 73 17 AV6 0.8 D 36 41 32 04H 0.38 D 32 12 17 AV1 0.83 D 34 75 9 AV3 0.35 D 36 41 17 AV2 0.83 D 32 12 12 AV2 0.54 D 34 75 14 AV5 0.65 D 36 46 11 AV5 0.43 D 32 12 17 AV3 0.79 D 34 76 12 AV2 0.53 D 36 67 23 AV2 1.21 D 32 12 37 AV5 2.38 D 34 76 12 AV3 0.55 D 36 67 11 AV3 0.51 D 33 58 11 AV1 0.48 D 34 76 14 AV4 0.65 D 36 80 12 AV3 0.54 D 33 58 16 AV2 0.75 D 34 76 14 AV5 0.64 D 36 82 15 AV1 0.72 D 33 58 11 AV3 0.46 D 34 92 10 AV4 0.53 D 36 82 28 AV2 1.67 D 33 96 13 AV1 0.56 D 34 103 12 AV3 0.49 D 36 82 19 AV3 0.97 D 33 96 16 AV2 0.75 D 34 109 20 AV5 0.94 D 36 82 24 AV4 1.31 D 33 107 13 AV4 0.56 D 35 22 10 AV3 0.42 D 36 82 23 AV5 1.26 D 34 15 11 AV1 0.54 D 35 22 10 AV4 0.43 D 36 90 14 AV2 0.69 D 34 15 15 AV4 0.76 D 35 22 10 AV6 0.44 D 37 16 15 AV1 0.61 D 34 17 11 AV1 0.52 D 35 37 23 AV2 1.12 D 37 16 13 AV2 0.49 D 34 17 14 AV2 0.72 D 35 37 17 AV3 0.76 D 37 16 23 AV3 1.11 D 34 17 11 AV3 0.54 D 35 37 11 AV6 0.44 D 37 16 18 AV4 0.76 D 34 17 10 AV4 0.47 D 35 51 15 AV1 0.62 D 37 16 10 AV5 0.39 D 34 22 12 AV2 0.59 D 35 51 13 AV2 0.52 D 37 16 15 AV6 0.61 D 34 22 13 AV3 0.66 D 35 51 11 AV4 0.42 D 37 19 10 AV6 0.42 D 34 22 10 AV4 0.48 D 35 53 12 AV3 0.49 D 37 38 11 AV2 0.44 D 34 22 9 AV5 0.41 D 35 53 16 AV4 0.69 D 37 38 11 AV3 0.44 D 34 22 11 AV6 0.52 D 35 69 31 AV2 1.88 D 37 38 19 AV4 0.92 D 34 30 13 AV3 0.55 D 35 69 31 AV3 1.84 D 37 38 12 AV5 0.5 D 34 30 10 AV5 0.4 D 35 69 16 AV4 0.76 D 37 39 14 AV2 0.65 D 34 35 12 AV2 0.54 D 35 69 11 AV5 0.48 D 37 39 16 AV3 0.74 D 34 35 14 AV5 0.66 D 35 69 12 AV6 0.53 D 37 39 19 AV4 0.92 D 34 40 11 AV4 0.46 D 35 71 9 AV1 0.39 D 37 39 20 AV5 0.93 D 34 40 13 AV5 0.53 D 35 71 16 AV2 0.76 D 37 39 12 AV6 0.55 D 34 40 17 AV6 0.74 D 35 71 12 AV3 0.52 D 37 40 12 AV3 0.51 D 34 43 16 AV2 0.72 D 35 83 15 AV3 0.63 D 37 40 13 AV4 0.56 D 34 48 15 AV5 0.64 D 35 83 16 AV4 0.65 D 37 40 12 AV6 0.47 D 34 50 13 AV2 0.55 D 35 86 10 AV4 0.44 D 37 45 19 AV2 0.88 D 34 50 12 AV3 0.51 D 35 86 12 AV6 0.55 D 37 45 14 AV3 0.61 D 34 69 21 AV2 1.07 D 35 88 14 AV2 0.65 D 37 45 14 AV4 0.61 D 34 69 21 AV3 1.05 D 35 88 11 AV3 0.49 D 37 45 11 AV5 0.47 D 34 69 35 AV4 2.24 D 35 88 19 AV4 0.98 D 37 48 13 AV1 0.54

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts D 37 48 12 AV2 0.49 D 39 50 19 AV3 0.88 D 40 66 21 AV4 1.03 D 37 48 23 AV3 1.12 D 39 50 14 AV4 0.65 D 40 66 27 AV5 1.47 D 37 48 16 AV4 0.72 D 39 50 17 AV5 0.77 D 40 66 17 AV6 0.79 D 37 48 15 AV5 0.65 D 39 57 10 AV1 0.38 D 41 18 13 AV4 0.56 D 37 48 12 AV6 0.5 D 39 57 17 AV2 0.72 D 41 20 18 AV2 0.86 D 37 58 22 AV2 1.05 D 39 57 22 AV3 1.04 D 41 20 20 AV3 1.06 D 37 58 15 AV3 0.67 D 39 57 11 AV4 0.41 D 41 20 21 AV4 1.1 D 37 59 16 AV2 0.67 D 39 57 21 AV5 0.98 D 41 20 25 AV5 1.35 D 37 59 12 AV3 0.49 D 39 59 12 AV3 0.49 D 41 20 13 AV6 0.57 D 37 59 21 AV4 1 D 39 62 19 AV2 0.89 D 41 34 12 AV2 0.52 D 37 59 10 AV5 0.35 D 39 74 14 AV2 0.65 D 41 34 16 AV3 0.73 D 37 73 13 AV2 0.6 D 39 75 11 AV2 0.46 D 41 34 12 AV4 0.52 D 37 77 12 AV1 0.51 D 39 82 14 AV1 0.65 D 41 35 17 AV3 0.76 D 37 77 19 AV2 0.96 D 39 82 20 AV2 1.07 D 41 36 13 AV1 0.58 D 37 77 27 AV3 1.48 D 39 82 21 AV3 1.1 D 41 36 14 AV3 0.6 D 37 77 29 AV4 1.65 D 39 82 17 AV4 0.84 D 41 38 19 AV3 0.89 D 37 77 12 AV5 0.53 D 39 82 13 AV5 0.64 D 41 38 11 AV4 0.45 D 37 84 13 AV4 0.56 D 39 89 15 AV1 0.71 D 41 51 13 AV2 0.53 D 37 84 17 AV6 0.82 D 39 89 13 AV2 0.6 D 41 51 18 AV3 0.77 D 37 105 12 AV4 0.5 D 39 94 13 AV2 0.57 D 41 56 12 AV1 0.5 D 38 35 15 AV6 0.66 D 39 94 14 AV3 0.62 D 41 56 29 AV2 1.64 D 38 73 18 AV2 0.85 D 39 94 11 AV4 0.43 D 41 56 25 AV3 1.28 D 38 73 17 AV3 0.81 D 39 96 11 AV5 0.47 D 41 56 19 AV4 0.87 D 38 73 17 AV4 0.78 D 39 102 15 AV1 0.66 D 41 56 26 AV5 1.36 D 38 73 12 AV5 0.53 D 39 103 15 AV1 0.67 D 41 56 17 AV6 0.74 D 39 18 15 AVl 0.69 D 39 103 14 AV2 0.6 D 41 59 14 AV3 0.56 D 39 18 12 AV4 0.53 D 40 19 11 AVl 0.48 D 41 59 25 AV4 1.28 D 39 18 16 AV5 0.77 D 40 21 14 AV2 0.65 D 41 66 29 AV2 1.61 D 39 19 15 AV2 0.74 D 40 21 12 AV3 0.55 D 41 66 20 AV3 0.96 D 39 19 16 AV3 0.78 D 40 21 12 AV4 0.55 D 41 66 15 AV4 0.67 D 39 24 14 AV2 0.6 D 40 21 14 AV5 0.62 D 41 66 18 AV5 0.81 D 39 36 14 AV5 0.6 D 40 21 10 AV6 0.41 D 41 71 15 AV2 0.7 D 39 38 12 AV3 0.51 D 40 23 17 AVl 0.78 D 41 90 15 AV2 0.75 D 39 41 15 AV2 0.68 D 40 23 20 AV4 0.96 D 41 104 13 AV2 0.57 D 39 41 21 AV3 1 D 40 24 12 AV2 0.5 D 41 104 11 AV5 0.45 D 39 41 28 AV4 1.54 D 40 24 11 AV3 0.44 D 42 19 9 03C 0.21 D 39 41 19 AV5 0.89 D 40 24 12 AV4 0.49 D 42 19 15 AVl 0.74 D 39 41 14 AV6 0.63 D 40 24 12 AV5 0.49 D 42 19 19 AV3 0.93 D 39 44 13 AV1 0.54 D 40 26 15 AV3 0.65 D 42 19 15 AV4 0.71 D 39 44 18 AV3 0.79 D 40 66 13 AV1 0.53 D 42 19 10 AV5 0.42 D 39 44 16 AV4 0.72 D 40 66 32 AV2 1.91 D 42 20 14 AV6 0.62 D 39 44 17 AV5 0.74 D 40 66 22 AV3 1.06 D 42 24 11 AV1 0.47 D 39 44 17 AV6 0.85 D 40 66 33 AV3 2.01 D 42 24 14 AV2 0.61 D 39 50 14 AV2 0.61 D 40 66 24 AV4 1.2 D 42 24 11 AV3 0.47

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts SG Row Col Per Locn Volts D 42 24 25 AV4 1.35 D 43 54 16 AV2 0.68 D 46 38 14 AV6 0.64 D 42 24 13 AV5 0.55 D 44 26 14 AV1 0.6 D 46 39 18 AV4 0.84 D 42 37 21 AV2 1.03 D 44 26 17 AV2 0.81 D 46 39 34 AV5 2.05 D 42 37 21 AV3 1 D 44 26 14 AV3 0.6 D 46 39 17 AV6 0.84 D 42 37 15 AV4 0.68 D 44 26 21 AV4 1.01 D 46 42 24 AV4 1.21 D 42 37 13 AV6 0.53 D 44 26 14 AV5 0.59 D 46 42 23 AV5 1.16 D 42 39 14 AV3 0.61 D 44 36 15 AVl 0.68 D 46 42 14 AV6 0.57 D 42 39 17 AV4 0.75 D 44 36 13 AV2 0.57 D 46 60 15 AV4 0.63 D 42 40 10 AV6 0.38 D 44 36 19 AV3 0.92 D 46 98 13 AV3 0.56 D 42 46 12 AV2 0.48 D 44 45 13 AV2 0.53 D 47 28 12 AV4 0.51 D 42 46 24 AV3 1.19 D 44 45 18 AV3 0.82 D 47 38 10 AV6 0.4 D 42 46 14 AV4 0.59 D 44 45 22 AV5 1.15 D 47 49 32 AV2 1.98 D 42 46 20 AV5 0.94 D 44 45 16 AV6 0.68 D 47 49 23 AV3 1.15 D 42 47 14 AV2 0.57 D 44 48 18 AV2 0.84 D 47 53 17 AV4 0.75 D 42 47 15 AV3 0.68 D 44 48 30 AV3 1.69 D 47 53 23 AV5 1.09 D 42 47 17 AV4 0.78 D 44 48 20 AV4 0.92 D 47 53 17 AV6 0.72 D 42 47 15 AV5 0.64 D 44 48 20 AV5 0.95 D 47 61 19 AV4 0.87 D 42 54 12 AV4 0.48 D 44 48 15 AV6 0.62 D 47 61 11 AV6 0.45 D 42 77 16 AV5 0.76 D 44 69 12 AV2 0.52 D 47 92 13 AV3 0.6 D 42 92 10 AV1 0.48 D 44 91 21 AV2 1.1 D 47 97 10 AV3 0.43 D 42 92 14 AV2 0.69 D 44 91 28 AV3 1.66 D 47 97 12 AV5 0.5 D 42 92 13 AV3 0.63 D 44 91 27 AV4 1.52 D 48 65 15 AV4 0.73 D 42 92 18 AV4 0.92 D 44 91 24 AV5 1.3 D 49 27 12 AV3 0.52 D 42 92 19 AV5 0.98 D 44 91 9 AV6 0.4 D 49 28 18 AV5 0.82 D 42 92 17 AV6 0.85 D 44 100 26 05H 0.28 D 49 28 15 AV6 0.66 D 42 98 16 AV3 0.73 D 44 101 13 AV3 0.57 D 49 36 10 AV2 0.41 D 42 98 15 AV4 0.69 D 44 102 14 AV5 0.58 D 49 36 16 AV4 0.7 D 42 98 16 AV5 0.77 D 45 27 14 AV5 0.59 D 49 36 13 AV5 0.55 D 42 98 12 AV6 0.51 D 45 40 15 AV5 0.65 D 49 36 12 AV6 0.5 D 43 21 15 AV2 0.71 D 45 40 16 AV6 0.69 D 49 41 12 AV2 0.51 D 43 21 23 AV3 1.23 D 45 66 9 AVl 0.34 D 49 42 13 AV6 0.56 D 43 21 14 AV4 0.65 D 45 66 17 AV2 0.77 D 49 43 13 AV1 0.56 D 43 21 23 AV5 1.24 D 46 25 12 AV4 0.52 D 49 43 13 AV2 0.52 D 43 21 25 AV6 1.37 D 46 25 18 AV5 0.86 D 49 43 15 AV5 0.66 D 43 22 11 AV4 0.49 D 46 25 13 AV6 0.56 D 49 52 16 AV1 0.68 D 43 24 12 AV2 0.49 D 46 30 15 AV3 0.68 D 49 52 32 AV2 1.86 D 43 24 12 AV3 0.49 D 46 30 28 AV4 1.58 D 49 52 22 AV3 1.09 D 43 24 10 AV5 0.41 D 46 30 30 AV5 1.78 D 49 52 19 AV4 0.87 D 43 49 21 05H 0.22 D 46 32 12 AV2 0.51 D 49 52 14 AV5 0.59 D 43 49 14 AV3 0.61 D 46 32 13 AV6 0.57 D 49 52 19 AV6 0.87 D 43 51 15 AV2 0.62 D 46 38 12 AV2 0.49 D 49 55 14 AVl 0.56 D 43 51 15 AV3 0.6 D 46 38 16 AV3 0.74 D 49 55 19 AV2 0.85 D 43 51 13 AV4 0.52 D 46 38 33 AV4 2.05 D 49 55 12 AV3 0.49 D 43 51 25 AV5 1.27 D 46 38 33 AV5 2.02 D 49 81 23 AV4 1.24

SBK-L-22036 Appendix C - OR21 List of Imperfections (non-SCC)

SG Row Col Per Locn Volts SG Row Col Per Locn Volts D 49 81 . 16 AV5 0.75 D 56 41 20 AV6 1.07 D 49 82 10 AV6 0.43 D 56 43 11 AV2 0.54 D 49 87 12 AV3 0.55 D 56 43 10 AV3 0.5 D 49 87 15 AV4 0.72 D 56 65 15 AV3 0.69 D 49 93 13 AV6 0.58 D 56 69 10 AV3 0.43 D 49 94 12 AVl 0.5 D 56 69 15 AV4 0.76 D 49 94 12 AV2 0.52 D 56 69 23 AV5 1.28 D 49 94 11 AV3 0.46 D 56 69 17 AV6 0.86 D 49 94 18 AV5 0.82 D 56 81 19 AV5 0.84 D 49 94 11 AV6 0.44 D 56 81 14 AV6 0.56 D 50 44 19 AV2 0.88 D 56 82 14 AV5 0.65 D 50 44 13 AV3 0.52 D 56 82 14 AV6 0.63 D 50 50 25 AV4 1.29 D 57 72 11 AV5 0.4 D 50 89 13 AV6 0.57 D 58 58 10 AVl 0.49 D 50 93 13 AV5 0.6 D 58 58 12 AV6 0.61 D 50 94 12 AV4 0.53 D 58 75 15 AV2 0.63 D 50 94 22 AV5 1.12 D 58 75 12 AV5 0.45 D 50 94 28 AV6 1.53 D 58 75 17 AV6 0.72 D 51 62 11 AV2 0.52 D 59 59 14 AV5 0.53 D 52 33 14 AVl 0.6 D 59 60 13 AVl 0.51 D 52 33 16 AV3 0.73 D 59 62 15 AV5 0.57 D 52 33 30 AV4 1.72 D 59 66 16 AVl 0.73 D 52 33 18 AV5 0.83 D 52 33 17 AV6 0.77 D 52 35 16 AV2 0.75 D 52 35 25 AV3 1.31 D 52 35 14 AV4 0.65 D 52 35 28 AV5 1.58 D 52 35 13 AV6 0.54 D 53 34 14 AV4 0.57 D 53 43 12 AV2 0.51 D 53 62 16 AVl 0.73 D 53 89 20 AV6 1.04 D 54 43 14 AV2 0.61 D 54 43 14 AV4 0.6 D 54 58 12 AV2 0.52 D 55 39 11 AV3 0.42 D 55 41 14 AV2 0.53 D 55 76 8 AV4 0.34 D 55 82 11 AV2 0.47 D 56 41 25 AV2 1.48 D 56 41 9 AV3 0.43 D 56 41 30 AV4 1.88 D 56 41 26 AV5 1.54