SBK-L-20127, Generator Tube Inspection Report
| ML20295A551 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 10/20/2020 |
| From: | Browne K NextEra Energy Seabrook |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| SBK-L-20127 | |
| Download: ML20295A551 (27) | |
Text
{{#Wiki_filter:NEXTera ENERGY e SEABROOK October 20, 2020 SBK-L-20127 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 20 in the Spring of 2020. This letter contains no new regulatory commitments. If you have any questions regarding this submittal, please contact me at (603) 773-7932. Sincerely, Learning Site Director cc: NRC Region I Administrator J. Poole, NRC Project Manager NRC Senior Resident Inspector NEXTERA ENERGY SEABROOK, LLC , P.O. Box 300, LAFAYETIE ROAD, SEABROOK, NH 03874
Enclosure Steam Generator Tube Inspection Report
SBK-L-20127 Enclosure Seabrook Station OR20 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 20 (hereafter referred to as the OR20 inspection or outage), as required by Technical Specification section 6.8.1.7. Per the Seabrook Unit 1 Technical Specification section 6.7.6.k, the first ISi period is 120 EFPM; the second ISi period is 96 EFPM; the third and subsequent inspection periods are 72 EFPM. The OR20 SG inspection was performed in accordance with Technical Specification 6.7.6.k and was the first inspection of the SGs in the fourth ISi period. At unit shutdown for the OR20 inspection, the SGs had operated for approximately 25.98 EFPY (311.7 EFPM) since installation. This included operation for approximately 1.42 EFPY (17.0 EFPM) during the fuel cycle (cycle 20) leading up to the OR20 inspection. Initial entry into Mode 4 following completion of the OR20 inspection was made on April 24, 2020. 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 Thot 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. OR20 was originally planned as a "skip" outage for SG inspections; however, since an axial PWSCC indication at the TTS in the HL of SG-C was identified in OR19, the inspection in OR20 was required to meet Technical Specification requirements. The OR20 inspection scope met the requirements of the Seabrook Unit 1 Technical Specifications and the EPRI SGMP: PWR Steam Generator Examination Guidelines, Revision 8. References to Seabrook's prior SG Tube Inspection Reports in the third inspection period are tabulated in Appendix A along with a list of acronyms used in this report. A. Scope of Inspections Performed on each SG The inspection scope for OR20 met the requirements of Seabrook Unit 1 Technical Specification 6.7.6.k.d. To meet the sequential period requirements in Technical Specifications, tube selection priority for all samples was given to the ones not inspected in the previous exam (OR 19). Unless otherwise noted, the defined OR20 base inspection scope in all 4 SGs was: Primary-side:
- Full-length bobbin probe exam of a 50% sample of all active tubes except the U-bend sections of Rows 1 & 2.
* +Point' probe exam of a 50% sample of Rows 1 & 2 U-bends from the uppermost TSP on the HL to the uppermost TSP on the CL.
- X-Probe 1 exam of peripheral tubes2 in the tubesheet region of the HL and CL. The extent was from the FOB (01H or 01C) down to the tube end.
- X-Probe exam of a 50% sample of non-peripheral tubes in the HL tubesheet region of SG-A, SG-B and SG-D. The extent was from the lowest horizontal tube support structure down to the tube 1 The X-Probe was utilized for SG exams at Seabrook for the first time in OR20. Justification for X-probe technique extension at Seabrook is documented for use at expansion transitions, BLG/OXP in the tubesheet, freespan dings and dents at structures in Westinghouse (proprietary) document, SG-CDMP-20-11 Rev 0.
2 Peripheral tubes are defined by the 3 outermost tubes of each row exposed to the annulus, and the ones in tube-free lane (rows 1-3 in columns 1-11 and 112-122). Page 1 of 25
SBK-L-20127 end. All non-peripheral tubes in the HL tubesheet region of SG-C were also examined with the X-Probe.3
- X-Probe exam in the HL tubesheet region included at least 50% of the BLG/OXP within the H*
depth of the tubesheet.
* +Point' probe exam of a 50% sample of DNG/DNT >5V in the HL (freespan, supports), U-bend and uppermost CL TSP (called 08C).
- X-Probe exam of all "high stress" tubes at HL & CL TSP locations.
* +Point' probe exam of all HL TSP locations on non-high stress tubes which had a large noise residual (defined as locations with a vertical maximum noise component of >0.45 volt on the P1 mix channel).
- Various diagnostic/special interest exams using the +Point' probe including all I-codes from bobbin 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.
- Channel head visual inspection and bowl scan per Westinghouse NSAL 12-1 Rev 1, "Steam Generator Channel Head Degradation," October 2017.
Inspection Expansion: The base scope inspections identified 6 crack-like axial ODSCC indications in 5 tubes in SG-B; each indication was coincident with a dent at the upper or lower edge of the uppermost TSP. The indications resulted in an expansion of the inspection to 100% full-length bobbin probe exams and 100% +Point' probe exams of DNG/DNT >5V in SG-B, per the Degradation Assessment (DA). No scope expansion was required in the other SGs to meet the SG inspection program expansion requirements in the SGMP Integrity Assessment Guidelines and the OR20 DA. An additional 9 crack-like axial ODSCC indications in 6 tubes were identified based on the inspection expansion. Additional details on the 15 (total) crack-like indications are provided later in the report. Secondary side:
- No SG secondary-side inspection and maintenance activities were performed during the OR20 outage.
B. Degradation Mechanisms Found The following degradation mechanisms were identified during the OR20 inspection:
- Axial ODSCC indications (SAi) at dented broached-hole TSP locations. 4
- 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 No SCC was identified at the TTS expansion transition region in OR20.
3 The scope defined in this bullet meets the TS requirement (for re-inspection for cracking) based on the axial PWSCC indication found in SG-C during the previous inspection (OR19). 4 Note: This degradation mechanism was previously identified in tube R 18C116 in SG-C during the OR 15 SG inspection. (Ref. NRC ADAMS Accession No. ML13008A160) Page 2 of 25
SBK-L-20127 C. NOE Techniques utilized for each Degradation Mechanism Table 1a is the list of the EPRI ETSSs used for degradation detection during the OR20 ECT inspection. Table 1a - NOE Detection Techniques utilized
. .i.. .. .
Detection ETSS used for Degra<:l§ltion
- Lo~tion l 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 Arrav 24998.1 Rev 1 sludqe pile Broached TSPs, 1-28411 Rev 4 FOB locations Bobbin 1-28413 Rev 5 freespan 24013.1 Rev2 ONG/ONT 5'5V 10013.1 Rev 1 22401.1 Rev 4 Axial OOSCC 96703.1 Rev 17 ONG/ONT >5V
+PoinFM 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 Circ PWSCC BLGs/OXPs 96511. 1 Rev 16 Axial/Ci re
+Point' 96511.2 Rev 16 low row U-bends PWSCC 99997.1 Rev 10 Table 1 b is the list of the EPRI ETSSs used for degradation sizing based on the degradation mechanisms reported during the OR20 ECT inspection.
Table 1b - NOE Sizing Techniques utilized
. :sizing **
- EJSS µsed for<.: *.** Degrada.tiof'l Location I Applicability
> probe ...>?.sizinQ ******..
- 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)
Page 3 of 25
SBK-L-20127 D. Location, orientation (if linear), and measured sizes (if available) of service induced indications ODS CC: Fifteen (15) single axial crack-like indications (SAi) of ODSCC were reported in eleven (11) tubes at the uppermost TSP location in SG-B in OR20. All indications were coincident with dents at the upper or lower edge of the TSP and were in the peripheral region of the bundle. One indication was in the CL section (at 08C); the remaining indications were in the HL section (08H). None of the 11 tubes are classified as "high stress tubes". The location and measured sizes of each indication are characterized as shown in Table 2 below. The first 5 tubes (6 indications) listed in Table 2 were part of the base scope inspection; the remaining indications resulted from inspection expansion. In addition to the diverse ECT probe types used to detect/size the indications, the Ghent probe was also used to confirm the first 6 indications and the one in the CL; all indications were classified as SAi based on Ghent probe analysis. Section G of this report summarizes the results of condition monitoring for these indications. Appendix B also provides a more detailed discussion on the SAls reported in OR20. Table 2 - OR20 SCC Indications Location .*. Bobbin . Reportinq Code .*. tndication sizes Max.Volts Row Col elevation Dent size Code X-Probe 5 +Point' lenqth (in.) Max. depth(% TW) (+Point') 10 121 08H+0.31 <2V DDS SAi SAi 0.22 58% 0.39 11 121 08H+0.4 <2V DDS NDF SAi 0.20 52% 0.31 14 119 08H+0.51 10.25V ONT NDF SAi 0.12 57% 0.36 15 120 08H-0.63 10.38V ONT NDF SAi 0.13 50% 0.26 08H+0.41 16.01V ONT SAi SAi 0.14 65% 0.61 16 120 08H-0.45 12.44V ONT SAi SAi 0.13 62% 0.44 13 120 08H-0.37 9.02V ONT not tested SAi 0.12 53% 0.31 08H+0.49 10.32V ONT not tested SAi 0.15 60% 0.41 14 120 08H-0.42 12.81V ONT not tested SAi 0.12 61% 0.46 15 119 08H+0.61 11.31V ONT not tested SAi 0.15 44% 0.21 08H+0.63 13.12V ONT not tested SAi 0.12 63% 0.47 16 119 08H-0.33 12.96V ONT not tested SAi 0.18 51% 0.28 08H+0.51 <2V DOI not tested SAi 0.18 65% 0.55 16 5 08H-0.48 <2V OSI not tested SAi 0.18 60% 0.42 42 102 08C-0.51 8.9V ONT not tested SAi 0.13 52% 0.37 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. Table 3 summarizes the current inspection results for AVB wear, and the list of AVB indications reported during OR20 is included in Appendix C. In Table 3, the "number of indications" includes pre-existing and new indications. AVB indications were detected in all 4 SGs, as expected. The highest AVB wear indication was 41 % TW. The total number of AVB indications is typical among the population of Model F SGs. 5 Although the X-Probe was extended through technique justification for detection of DNG/DNT in OR20, the +Point' probe is the "probe of record" for indications at DNG/DNT >SVolts. Page 4 of 25
SBK-L-20127 Table 3-0R20 AVB Wear No. of No. oflndications New lndications<1l 1, New ,, SG Indications ~40%TW Number Max Depth Tubes£2 l SG-A 381 2 6 18%TW 2 SG-8 288 1 2 14%TW 2 SG-C 257 0 1 13%TW 1 SG-D 500 0 0 N/A 0
- 1. Includes indications on tubes without prior reported indications
- 2. Newlv-reported with AVB wear with no prior history of AVB indications.
Wear (Volumetric) Indications At or Above the TIS: Volumetric wear indications reported in OR20 are attributed to a) legacy maintenance-related (MNT) activity; b) wear at horizontal tube support structures, or c) wear associated with foreign objects (FOs). Five (5) new volumetric indications were newly reported in OR20: 1 in SG-A, 3 in SG-C and 1 in SG-D. The indications were all dimensionally sized using qualified EPRI ETSSs (Table 1b) for the +Point' probe and are listed in Tables 4a, 4b and 4c. a) Indications reported in row 1 that are located approximately 18" above the tubesheet or above the FDB 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 4a. b) Two TSP volumetric wear indications were newly reported in OR20: one (23% TW) in SG-C (R6C39 at 06C), the other (28% TW) in SG-D (R5C100 at 06H). Lookback reviews for the indication in SG-D show a discernable change in amplitude from OR 19, indicating this indication has grown. No discernable change in amplitude (or any other change) was noted in lookback reviews for the indication in SG-C. This indication has not grown for several cycles. All other volumetric wear indications at TSPs remain essentially unchanged from previous inspections. Volumetric indications from TSP wear are listed in Table 4b. c) 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. Three foreign object-related VOL wear indications were newly reported in OR20. Two of them were on adjacent tubes in the CL on the FDB in SG-C with PLPs (but no wear) also reported on 2 neighboring tubes. A lookback review shows that the 2 wear indications can be traced back to the 1997 data. However, the bobbin signal is mixed within the tube background noise and the signals have not been changing. The 2 tubes with FO wear indications and the ones nearby with the 2 PLPs were plugged and stabilized. Section E of this report provides additional discussion on these 2 FO wear indications and nearby PLPs. The third newly reported FO wear indication was located just below the 61h broached TSP in the CL (06C) of SG-A. The lookback review shows that the indication has not grown for several cycles and is most likely attributed to a transient foreign object. No PLPs were associated with this indication. Volumetric indications from FO-related wear are listed in Table 4c. Page 5 of25
SBK-L-20127 OR20 Volumetric (VOL) Indications from Maint. Equipment, TSP Wear and Foreign Object Wear (Shaded items denote tubes that were plugged in OR20) Table 4a Table 4b Indications from legacy SL Equipment indications from TSP Wear SG Row Col Location %TW SG Ro\N Col Location %TW A 1 87 TSC+18.85" 27% A 4 87 06C-0.5" 10% A 1 36 TSC+18.09" 25% A 5 108 06C-0.58" 14% A 1 11 01 C-1.68" 24% A 18 82 06C-0.62" 8% B 1 11 TSC+18.45" 33% B 5 86 04H-0.42" 13% B 1 87 TSH+18.32" 38% B 22 97 05H-0.56" 25% B 1 87 TSC+18.32" 37% c 3 90 07C-0.64" 23% B 1 112 TSH+18.35" 26% c 5 57 06C-0.64" 26% B 1 119 01H+16.16" 16% c 6 39 06C-0.47 23%*' c 1 87 TSH+17.94" 34% c 32 24 04H-0.4" 24% c 1 87 TSC+17.94" 13% 0 6 108 03H-0.41" 10% c 1 112 TSH+18.36" 22% 0 42 19 03C+0.20" 11% c 1 112 TSC+18.55" 16% 0 5 100 06H+0.71" 28%** D 1 87 TSH+18.42" 31% ** Newly reported in OR20. Table 4c Indications from Foreign Object Wear SG Row Col Location %TW A 11 76 06C-0.8" 20%** 21 26 03H-0.64" 23% 35 80 03H-0.46" 35% 35 88 03H-0.96" 27% 49 29 TSH+0.16" 25% 50 29 TSH+0.12" 14% 53 33 TSH+0.33" 12% B 2 98 06C-0.83" 32% 2 113 07H+1.07" 26% 43 96 TSH+0.06" 19% 54 87 01C+0.57" 20% c 3 113 05C-0.80" 33% 28 104 05C-0.63" 24% 32 35 07C+19.45" 10% 39 19 TSC+4.05" 18% 43 26 TSH+0.07" 21% 44 26 TSH+0.12" 10% 45 23 01C+0..59" 10%** 45 24 01C+0.62" 13%.. D 13 4 01C+0.41" 28% 21 52 04H-0.41" 26%
** Newly reported in OR20.
Page 6 of 25
SBK-L-20127 Miscellaneous Special Interest Inspections: Six (6) PLP signals were newly reported in OR20. Four of them were not associated with volumetric indications; the remaining 2 PLPs were associated with two FO wear (VOL) indications in SG-C and are discussed in paragraph c) of the previous section. Geometric Anomalies: Based on the sample of BLG and OXP indications inspected in OR20, no evidence of any new degradation was found. All signals were previously reported, and no degradation was associated with any of the BLG signals. No SCC indications were detected during the inspection of "high stress tubes" at HL and CL TSP locations. SCC was also not reported on non-high stress tubes that had large noise residuals. E. Number of tubes plugged during the inspection outage for each degradation mechanism Seventeen (17) tubes were plugged based on the OR20 inspection. Tubes plugged for each degradation mechanism are summarized below in Table 5: Table 5 - OR20 Tubes Plugged SG* **Tube :* **Degradati<>n Mechanism* Location :* :*::) *.*
* .. ** *Notes .:. *
. ; . **\*******
AV3+0.05 ~40% TW at AV3 and AV4 A R35C58 AVB Wear AV4-0.23 R40C48 AVB Wear AV3+0 40% TWatAV3 R10C121 Axial ODSCC (SAi) 08H+0.31 SAi at broached TSP dent location R11C121 Axial ODSCC (SAi) 08H+0.4 SAi at broached TSP dent location R14C119 Axial ODSCC (SAi) 08H+0.51 SAi at broached TSP dent location R15C120 Axial ODSCC (SAi) 08H-0.63 SAi at broached TSP dent location 08H+0.41 SAi at broached TSP dent location R16C120 Axial ODSCC (SAi) 08H-0.45 B R13C120 Axial ODSCC (SAi) 08H-0.37 SAi at broached TSP dent location 08H+0.49 SAi at broached TSP dent location R14C120 Axial ODSCC (SAi) 08H-0.42 R15C119 Axial ODSCC (SAi) 08H+0.61 SAi at broached TSP dent location 08H+0.63 SAi at broached TSP dent location R16C119 Axial ODSCC (SAi) 08H-0.33 08H+0.51 SAi at broached TSP dent location R16C5 Axial ODSCC (SAi) 08H-0.48 R42C102 Axial ODSCC (SAi) 08C-0.51 SAi at broached TSP dent location R45C23 FO Wear with nearby 01C+0.59 Volumetric (VOL) wear with 10%TW, near PLP PLP. Tube pluaaed; stabilized in CL. R45C24 FO Wear with nearby 01C+0.62 Volumetric (VOL) wear with 13%TW, near PLP PLP. Tube pluaaed; stabilized in CL. c R46C24 PLP, no wear 01C+0.32 No tube wear. Preventively plugged due to proximity to VOL indications. Stabilized in CL. R47C24 PLP, no wear 01C+0.73 No tube wear. Preventively plugged due to proximity to VOL indications. Stabilized in CL. 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 6. Page 7 of 25
SBK-L-20127 Table 6 - Tubes plugged to-date and effective plugging percentage
.*. :< .. , SG-A SG-B SG-C SG-D *.* Total Tubes Plugged 43 39 65 65 212 Percent Plugged 0.76% 0.69% 1.16% 1.16% 0.94%
G. Results of Condition Monitoring, including the results of tube pulls and in-situ testing All indications found in OR20 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 OR20 justified operation for Cycle 20 for all existing degradation mechanisms by comparison to the OR19 OA predictions. The OR20 inspection results validate the projections and conclusions of the previous outage. The next SG inspections are scheduled for OR21.
- 1. Fifteen (15) single axial crack-like indications (SAi) of ODSCC were detected in eleven (11) tubes in SG-B. Each indication was coincident with a dent at the upper or lower edge of the uppermost TSP. All except one indication was in the HL, and all indications were in the peripheral section of the bundle. The maximum +Point' probe voltage was 0.61 Volt. The axial ODSCC indications were assessed regarding the need for in-situ testing. The lowest predicted burst pressure at 95% probability & 50% confidence was found to be 7395 psid, which exceeds the 3xNOPD pressure differential for Seabrook of 3860 psid. None of the indications met the screening criteria for burst and leak testing, and all indications met the condition monitoring (CM) requirements. No tube pulls were performed. A more detailed discussion of the CM screening applied to the ODSCC indications is documented in Appendix B.
- 2. The maximum observed AVB wear indication (41 %TW) is less than the CM limit of 70% TW for AVB wear. 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 38% TW.
The indication has shown no growth for the last several cycles and is less than the CM limit (49% 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 OR20 inspection due to foreign objects was 35% TW.
The CM limit for the local wear is 56% TW. Therefore, wear due to foreign objects met the performance requirements for Condition Monitoring.
- 5. 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 2.74 gpd or 0.0019 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 meet the Condition Monitoring requirements with regard to leakage.
- 6. Channelhead Components Visual Inspection:
- Tube Plug Inspection: During the inspection of tube plugs in OR20, 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 Page 8 of 25
SBK-L-20127 Management Guidance for Various Steam Generator Components." Areas inspected include the divider plate-to-channelhead weld, the weld at the top of the channelhead bowl drain tube, the channelhead-to-tubesheet girth weld seam region, the divider plate, and all cladded surfaces of the channelhead bowl and tubesheet. An anomaly was identified in the surface of the channelhead cladding in the CL of SG-B. The location of the anomaly was approx. 22 inches from the divider plate and 6 inches down from the primary face of the tubesheet, and measured approx. 5/16-inch long, 1/8-inch wide, and 0.15-in maximum depth. A lookback review of previous inspection videos show that a blemish was discernable in that location as far back as OR 17. An engineering evaluation (vendor proprietary) of the anomaly was documented for the worst-case scenario assuming a conservative wastage/corrosion rate. The results show that the condition can exist without repairs for the 60-year operating life of the plant and still have significant margin before the channelhead base metal is exposed. 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 OR20.
- 7. No inspections and maintenance on the secondary side of the SGs were performed in OR20.
H. Primary-to-secondary leakage rate observed in each SG during the previous cycle Seabrook has tracked detectable normal operating leakage in SG-B that has varied between 0.22 gpd and 1.1 gpd during the fuel cycle preceding the OR20 inspection. This low level of leakage has been detected for several cycles, fluctuating between 0 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 0.22 gpd to 1.1 gpd in the fuel cycle preceding the OR20 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 sec indications in SG-B; this is supported by primary-to-secondary leak trends in SG-B which show similar levels before and after OR20. Because 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-B is at the upper end of the observed range (i.e. 1.1 gpd), the predicted accident-induced leakage (OosA) in SG-B is: OosA = 2.49 x 1.1 gpd = 2.74 gpd (=0.0019 gpm) Therefore, since the predicted accident-induced leakage from SG-B (2.74 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 OR20 inspection. Page 9 of 25
SBK-L-20127 Appendix A - Additional Information References to prior SG Tube Inspection Reports (3rd inspection period) Inspection # EOG**** Outage NRG 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 Abbreviations and Acronyms: AVB Anti Vibration Bar NOPD Normal operating pressure differential BLG Bulge NSAL Nuclear Safety Advisory Letter CL Cold Leg OA Operational Assessment CM Condition Monitoring OD Outside Diameter DA Degradation Assessment ODS CC OD Stress Corrosion Cracking OBA Design Bases Accident OXP Over-expansion DOI Distorted Dent Indication Per Percent Through-Wall DDS Distorted Dent Signal PLP Possible Loose Part ONG Ding PWSCC Primary Water SCC ONT Dent SAi Single Axial Indication OSI Distorted Support Indication sec Stress Corrosion Cracking ECT Eddy Current Testing SG Steam Generator EFPM Effective Full Power Months SGMP SG Management Program EFPY Effective Full Power Years SIPC Structural integrity performance criteria EOC End-Of-Cycle SL Sludge lancing EPRI Electric Power Research Institute TS Tubesheet ETSS Exam Technique Spec Sheet TSC Tube Sheet Cold FOB Flow Distribution Baffle TSH Tube Sheet Hot FO Foreign Object TSP Tube Support Plate GPD (gpd) Gallons per Day TTS Top of Tube Sheet GPM (gpm) Gallons per Minute TW Through Wall HL Hot Leg TWO Through Wall Depth ID Inside Diameter UFSAR Updated Final Safety Analysis Rpt MNT Maintenance Related VcRIT Critical voltage for leakage NOD No Degradation Detectable VTHR-L Threshold voltage for leak testing NDF No Degradation Found VOL Volumetric NEI Nuclear Energy Institute Page 10 of25
SBK-L-20127 Appendix B - OR20 Axial ODSCC Indications The maximum +Point' probe voltage of the 15 axial ODSCC crack-like indication reported in OR20 was 0.61 Volt (see Table 2). The indications were assessed regarding the need for in-situ testing. The lowest predicted burst pressure at 95% probability & 50% confidence was found to be 7395 psid, which exceeds the 3xNOPD pressure differential for Seabrook of 3860 psid. Thus, the structural integrity performance criteria (SIPC) are satisfied. All except 2 of the indications reported in Table 2 have a maximum +Point' probe amplitude of ::;;o.5 volts and screened out. In addition, each indication had a total length <0.6 inch; therefore, supplemental screening was not necessary. From the degradation assessment, LsTR = 0.4 inch (the limiting calculated length of an axial crack which satisfies the SIPC regardless of its depth). The remaining 2 indications both had crack lengths less than LsTR and screened out for proof testing. Therefore, for all axial ODSCC indications, CM is met for structural integrity and an in-situ proof test was not necessary. From Table 4-1 of the SGMP: SG In-Situ Pressure Test Guidelines Rev 5, VcR1T = 2.4 and VTHR-L = 1.26. The maximum +Point' probe amplitude was less than these values in all cases. Thus, for all axial ODSCC cases, Condition Monitoring is met for leakage integrity, and an in-situ leak test was not necessary. Therefore, none of the indications met the screening criteria for burst and leak testing, and all indications met the condition monitoring (CM) requirements. Four (4) of the 15 axial ODSCC indications reported in OR20 were at DNTs ::;;5Vand were detected with the bobbin probe. The other 11 indications all had DNTs > 7.5V (the maximum voltage for which the X-Probe had been extended) and were tested with the +Point' probe. Four of the affected tubes each had an ODS CC indication in both the upper and lower edge of the TSP. For these instances, the upper indication was spaced approximately 180° from the lower indication (paired dent). All ODSCC indications were confirmed with the +Point' probe and line-by-line depth profiling was performed on each indication. The depth profile of each indication is provided 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 to characterize the indications. A lookback review of past ECT data showed that some of the axial ODSCC indications at dented TSPs in OR20 had discernable signals at prior inspections but were likely not reported previously for one or more reasons such as some signals not having reached the reporting criteria for a select probe type, negligible change in ECT signals in recent inspections, and the occurrence of complex (but low-level) signals. The qualification of the X-Probe by technique extension at various regions of the bundle may be of benefit in future inspections in providing an alternate NDE detection technique. The operating experience and results of the Seabrook OR20 inspections have been shared with the SG industry through the EPRI SGMP. The ECT data is available to utility members to update their site-specific training materials for future ECT inspections. Page 11 of 25
SBK-L-20127 Appendix B - OR20 Axial ODSCC Indications Indication Length/Depth Profiles at dented TSP Locations (ETSS 1-28432 Rev 2) SG-B R10C121 Axial ODSCC at Paired Dent 08H+0.31 SG-B R16C120 Axial ODSCC at Paired Dent 08H+0.41 Flaw Prnfile Flaw Profile 100 wr---t----t---+---+--+---t----'1---4 wr---t----t---+---+--+---t----;t---4 I
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SBK-L-20127 Appendix B - OR20 Axial ODSCC Indications Indication Length/Depth Profiles at dented TSP Locations (ETSS 1-28432 Rev 2) SG-B R14C120 Axial ODSCC at Paired Dent 08H-0.42 SG-B R16C5 Axial ODSCC at Paired Dent 08H+0.51 Flaw Profile Flaw Profile t-----t----+----+----t---t---4
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Page 13 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per Locn SG Row Col Per Locn A 1 11 24 OlC A 27 112 16 AVl A 32 89 16 AV3 A 1 36 2S TSC A 27 112 13 AVS A 33 14 17 AVl A 1 87 27 TSC A 28 44 17 AV2 A 33 14 17 AV2 A 4 87 10 06C A 28 44 19 AVS A 33 lS 14 AV4 A s 108 14 06C A 28 S9 27 AV2 A 33 lS 23 AVS A 11 76 20 06C A 28 S9 22 AVS A 33 lS 21 AV6 A 17 67 16 AVl A 29 11 22 AV2 A 33 71 16 AVl A 17 71 16 AVl A 29 71 lS AV2 A 33 71 16 AV2 A 18 S8 17 AVl A 29 82 23 AV2 A 33 92 17 AVl A 18 82 8 06C A 29 82 18 AV6 A 33 106 17 AVl A 19 40 30 AVl A 29 84 17 AVS A 34 17 lS AV3 A 19 S4 24 AVl A 29 84 14 AV6 A 34 17 16 AV6 A 19 S8 21 AVl A 29 94 26 AV2 A 34 Sl 24 AV2 A 19 61 lS AVl A 30 11 2S AVS A 34 Sl 2S AV3 A 19 61 11 AV6 A 30 12 13 AVl A 34 S9 lS AV2 A 20 48 19 AVl A 30 12 19 AVS A 34 S9 lS AV3 A 21 26 23 03H A 30 12 19 AV6 A 34 87 19 AV3 A 23 36 14 AVl A 30 31 16 AVS A 34 87 22 AV4 A 23 37 17 AV6 A 30 S8 23 AVS A 34 94 14 AVl A 23 38 16 AV2 A 30 S8 21 AV6 A 34 9S 17 AV3 A 23 42 20 AV6 A 30 64 18 AV2 A 34 97 20 AV2 A 23 4S lS AVS A 30 64 16 AVS A 34 103 13 AVl A 23 4S 13 AV6 A 30 68 14 AVl A 3S 14 18 AV2 A 23 S2 19 AV2 A 30 68 lS AV2 A 3S 14 19 AV4 A 23 S2 19 AVS A 30 89 12 AV2 A 3S 14 21 AVS A 23 S9 21 AV2 A 30 9S 17 AV6 A 3S 14 14 AV6 A 23 S9 20 AVS A 30 102 14 AVS A 3S 31 20 AV3 A 23 61 12 AV2 A 30 109 13 AVl A 3S 31 21 AVS A 24 7 17 AVl A 30 109 17 AVS A 3S SS 17 AV2 A 24 7 16 AV6 A 30 109 17 AV6 A 3S SS 14 AV4 A 24 S9 21 AV2 A 30 111 17 AVl A 3S 58 20 AVl A 24 S9 19 AVS A 30 111 19 AVS A 3S S8 3S AV2 A 24 S9 16 AV6 A 30 111 14 AV6 A 3S 58 41 AV3 A 24 71 16 AV2 A 31 11 lS AV2 A 3S 58 40 AV4 A 24 71 19 AVS A 31 11 21 AVS A 3S S8 30 AVS A 2S 7 22 AVl A 31 12 3S AVS A 3S S8 21 AV6 A 2S S6 20 AV2 A 31 12 23 AV6 A 3S 61 17 AVl A 2S S9 16 AV2 A 31 13 17 AV6 A 3S 61 20 AV2 A 2S 68 lS AVl A 31 64 17 AV2 A 3S 61 23 AV3 A 2S 83 20 AV2 A 31 68 13 AV2 A 3S 61 39 AV4 A 26 107 32 AV6 A 31 69 lS AVS A 3S 61 3S AVS A 27 12 18 AV6 A 31 lOS lS AVl A 3S 61 lS AV6 A 27 63 lS AV2 A 32 89 17 AVl A 3S 70 14 AV2 Page 14 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG *Row: Col Per Loco SG Row Col Per Locn SG Row *Col Per Locn A 3S 73 26 AV2 A 41 S3 19 AVl A 42 72 2S AV4 A 3S 73 17 AV3 A 41 S3 lS AV2 A 42 72 29 AVS A 35 80 35 03H A 41 53 18 AV3 A 42 72 lS AV6 A 35 88 27 03H A 41 S3 29 AV4 A 42 80 14 AVl A 36 110 13 AV2 A 41 S3 27 AVS A 42 80 32 AV2 A 37 87 17 AV2 A 41 S4 26 AV2 A 42 80 3S AV3 A 37 99 16 AVl A 41 S4 24 AV3 A 42 80 24 AV4 A 37 99 18 AV3 A 41 S4 14 AV5 A 42 80 21 AVS A 37 99 16 AV4 A 41 S8 9 AVl A 42 80 29 AV6 A 37 102 22 AVl A 41 S8 lS AV2 A 42 81 22 AV4 A 37 102 14 AV4 A 41 S8 17 AV3 A 42 83 lS AV2 A 37 102 17 AVS A 41 S8 18 AV4 A 42 103 21 AVl A 37 105 19 AVl A 41 S8 15 AVS A 43 20 17 AV6 A 37 lOS 22 AV4 A 41 S9 2S AV2 A 43 SS 19 AV2 A 37 lOS 14 AV5 A 41 S9 16 AV3 A 43 98 18 AVS A 39 63 16 AV2 A 41 S9 14 AVS A 44 66 13 AVl A 39 63 17 AV3 A 41 68 18 AV2 A 44 94 13 AV2 A 39 79 14 AV2 A 41 68 33 AV3 A 44 94 lS AV3 A 39 79 20 AV3 A 41 68 27 AV4 A 44 94 18 AV4 A 39 79 27 AV4 A 41 68 23 AVS A 44 98 17 AVl A 39 79 26 AVS A 41 68 17 AV6 A 44 98 20 AV2 A 39 80 24 AV3 A 41 78 17 AV2 A 44 98 26 AV3 A 40 71 26 AV2 A 41 78 23 AV3 A 44 98 20 AV4 A 40 86 19 AVl A 41 78 16 AVS A 44 98 19 AV5 A 40 86 23 AV2 A 41 84 18 AV2 A 44 100 16 AVl A 40 86 15 AV4 A 41 84 17 AV4 A 44 100 16 AV3 A 40 86 17 AVS A 41 91 16 AVl A 44 100 17 AVS A 40 91 16 AV2 A 41 91 20 AV2 A 44 101 18 AVl A 40 91 17 AV4 A 41 102 lS AVl A 44 102 lS AV2 A 40 94 22 AV2 A 41 102 21 AV4 A 4S 67 19 AV2 A 40 94 16 AV4 A 41 102 21 AVS A 4S 68 17 AV2 A 40 96 12 AVl A 41 103 21 AVl A 4S 74 17 AVl A 40 102 16 AV3 A 41 103 lS AV3 A 4S 74 12 AV2 A 40 102 21 AV4 A 41 103 21 AV4 A 4S 74 29 AV3 A 40 103 16 AV3 A 41 103 23 AVS A 4S 74 33 AV4 A 40 103 27 AV4 A 41 103 13 AV6 A 4S 76 17 AVl A 40 103 24 AV5 A 42 22 14 AV4 A 45 80 lS AV3 A 41 3S 13 AV3 A 42 S8 30 AV3 A 4S 80 17 AV4 A 41 so 15 AVl A 42 S8 19 AV4 A 4S 98 13 AV4 A 41 so 20 AV2 A 42 S8 19 AVS A 46 6S 22 AV4 A 41 so 22 AV3 A 42 72 16 AVl A 46 6S 27 AVS A 41 so 25 AV4 A 42 72 20 AV2 A 46 71 lS AV3 A 41 so 36 AVS A 42 72 36 AV3 A 46 71 18 AV4 Page 15 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per locn SG Row Col Per Locn SG *ROW Col Per t.ocn A 46 71 19 AV5 A 48 95 20 AV5 A 50 95 19 AV3 A 46 77 18 AV2 A 48 95 22 AV6 A 50 95 23 AV4 A 46 77 15 AV3 A 48 96 22 AV6 A 50 95 34 AV5 A 46 77 23 AV4 A 49 28 16 AV2 A 50 95 30 AV6 A 46 94 15 AV6 A 49 29 25 TSH A 51 52 16 AV4 A 46 95 14 AV4 A 49 48 13 AVl A 51 53 11 AV4 A 46 95 22 AV5 A 49 54 14 AV3 A 51 71 16 AV4 A 46 95 24 AV6 A 49 57 12 AV2 A 51 75 19 AV5 A 46 97 14 AV6 A 49 57 15 AV4 A 51 77 17 AV4 A 46 98 22 AV4 A 49 57 12 AV5 A 51 86 17 AVl A 46 98 19 AV5 A 49 57 17 AV6 A 51 86 27 AV2 A 46 98 16 AV6 A 49 60 13 AV3 A 51 86 23 AV3 A 47 85 25 AV5 A 49 64 23 AVl A 51 86 21 AV4 A 47 89 19 AV3 A 49 65 17 AVl A 51 86 20 AV6 A 47 89 18 AV6 A 49 65 23 AV2 A 51 90 19 AV2 A 47 95 14 AVl A 49 65 38 AV3 A 51 90 19 AV3 A 47 95 21 AV2 A 49 65 27 AV4 A 51 90 23 AV4 A 47 95 24 AV3 A 49 65 21 AV5 A 51 90 23 AV5 A 47 95 23 AV4 A 49 76 19 AV2 A 51 90 21 AV6 A 47 95 17 AV5 A 49 88 16 AV2 A 52 53 15 AV2 A 47 95 18 AV6 A 49 88 26 AV3 A 52 57 14 AV3 A 47 98 18 AV5 A 49 88 26 AV4 A 52 73 20 AV3 A 48 31 17 AV3 A 49 88 30 AV5 A 52 73 19 AV5 A 48 31 18 AV4 A 49 88 16 AV6 A 52 88 17 AV3 A 48 31 13 AV5 A 49 90 17 AV5 A 52 88 34 AV4 A 48 31 17 AV6 A 49 90 19 AV6 A 52 88 30 AV5 A 48 60 22 AV6 A 49 91 13 AV5 A 52 88 24 AV6 A 48 63 13 AVl A 50 29 14 TSH A 52 89 13 AV3 A 48 63 25 AV2 A 50 38 18 AV4 A 52 89 26 AV4 A 48 63 26 AV3 A 50 38 20 AV5 A 52 89 32 AV5 A 48 63 26 AV4 A 50 60 16 AV2 A 52 89 31 AV6 A 48 63 22 AV5 A 50 60 18 AV3 A 52 90 21 AV6 A 48 64 24 AV2 A 50 66 15 AV2 A 53 33 12 TSH A 48 83 16 AV3 A 50 71 15 AV2 A 53 45 28 AV2 A 48 83 19 AV4 A 50 80 17 AV3 A 53 45 14 AV3 A 48 91 17 AV3 A 50 80 16 AV4 A 53 69 19 AV5 A 48 91 14 AV4 A 50 80 14 AV5 A 53 89 21 AVl A 48 91 14 AV5 A 50 85 14 AV2 A 53 90 18 AV4 A 48 92 16 AV6 A 50 85 26 AV3 A 54 86 14 AV2 A 48 94 15 AV4 A 50 85 25 AV4 A 55 41 12 AV5 A 48 94 15 AV5 A 50 85 18 AV5 A 55 41 17 AV6 A 48 94 17 AV6 A 50 85 18 AV6 A 56 57 17 AV2 A 48 95 15 AV4 A 50 88 23 AV6 A 56 81 15 AV4 Page 16 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per ,Locn, SG Row Col Per L()cn A 57 48 15 AV1 B 23 47 18 AV1 B 30 43 11 AV2 A 57 48 16 AV2 B 23 47 14 AV2 B 30 43 18 AV5 A 57 52 16 AV1 B 23 49 12 AV1 B 30 43 17 AV6 A 57 61 16 AV2 B 23 49 12 AV2 B 30 49 14 AV2 A 58 50 16 AV6 B 23 56 13 AVl B 30 58 12 AV5 A 58 76 16 AV2 B 23 56 13 AV2 B 30 61 22 AV2 A 58 76 16 AV3 B 24 43 12 AV2 B 30 61 34 AV5 B 24 43 13 AV5 B 30 62 15 AV2 B 24 45 12 AV2 B 30 66 11 AVl B 25 51 12 AVl B 30 66 12 AV2 SG Row: :Coli Per tocrl B 25 51 18 AV2 B 30 66 18 AV5 B 1 11 33 TSC B 25 51 17 AV5 B 30 66 11 AV6 B 1 87 37 TSC B 25 82 13 AV2 B 30 71 11 AV5 B 1 87 38 TSH B 25 112 12 AVl B 30 73 17 AV2 B 1 112 17 TSH B 27 42 23 AV2 B 30 73 16 AV5 B 1 119 16 01H B 27 57 12 AV2 B 30 75 26 AV2 B 2 98 32 06C B 27 63 13 AV5 B 30 75 21 AV5 B 2 113 26 07H B 27 81 16 AV5 B 30 79 17 AV2 B 5 86 13 04H B 27 107 21 AV5 B 30 79 15 AV5 B 12 65 15 AV1 B 27 112 12 AV1 B 30 80 16 AV1 B 15 68 7 AV1 B 28 42 23 AV2 B 30 80 19 AV2 B 16 54 14 AV1 B 28 42 18 AV5 B 30 80 18 AV5 B 17 64 13 AV1 B 28 65 10 AV2 B 30 81 28 AV2 B 17 69 12 AV1 B 28 65 12 AV6 B 30 81 33 AV5 B 17 77 11 AV1 B 28 78 19 AV2 B 30 87 19 AV2 B 18 66 12 AV1 B 28 115 10 AV2 B 30 87 29 AV5 B 18 74 15 AV1 B 28 115 13 AV5 B 30 87 20 AV6 B 19 66 16 AV1 B 29 30 19 AV2 B 30 106 12 AVl B 20 56 14 AV1 B 29 32 17 AV6 B 30 106 15 AV6 B 20 60 25 AV1 B 29 38 13 AV2 B 30 109 21 AV5 B 20 60 22 AV6 B 29 38 17 AV5 B 30 111 20 AV2 B 20 60 14 AV6 B 29 38 13 AV6 B 30 111 24 AV5 B 21 68 9 AV1 B 29 51 12 AV2 B 30 112 12 AV1 B 21 77 13 AV1 B 29 79 29 AVl B 30 112 19 AV2 B 21 115 16 AV6 B 29 79 24 AV2 B 30 112 16 AV5 B 22 36 20 AV1 B 29 79 22 AV5 B 31 111 28 AV5 B 22 36 18 AV2 B 29 79 15 AV6 B 31 112 16 AV1 B 22 36 19 AV6 B 29 89 15 AV1 B 31 112 18 AV2 B 22 69 15 AVl B 29 89 20 AV2 B 32 81 14 AV2 B 22 89 16 AV2 B 29 101 17 AV2 B 32 82 22 AV2 B 22 89 20 AV6 B 29 113 19 AV1 B 32 82 15 AV5 B 22 97 25 OSH B 29 113 20 AV5 B 32 82 12 AV6 B 22 116 11 AV2 B 29 113 10 AV6 B 32 83 18 AV2 Page 17 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Cot Per Locn SG Row Col Per Locn B 32 83 21 AV3 B 35 58 12 AV2 B 39 49 18 AV4 B 32 83 19 AV5 B 35 58 17 AV3 B 39 54 6 AV1 B 32 86 14 AV2 B 35 58 20 AV4 B 39 54 18 AV2 B 32 86 16 AV3 B 35 58 13 AV5 B 39 54 22 AV3 B 32 86 14 AV4 B 35 59 12 AV1 B 39 54 24 AV4 B 32 88 14 AV1 B 35 59 16 AV2 B 39 54 15 AV5 B 32 88 14 AV2 B 35 59 13 AV3 B 39 56 10 AV1 B 32 88 16 AV3 B 35 59 15 AV4 B 39 56 10 AV2 B 32 88 15 AV5 B 35 67 16 AV2 B 39 57 9 AVl B 32 103 18 AV2 B 35 67 15 AV3 B 39 57 13 AV2 B 32 109 20 AV5 B 35 67 14 AV4 B 39 57 11 AV3 B 32 109 17 AV6 B 35 68 5 AV1 B 39 57 12 AV4 B 33 95 17 AV2 B 35 68 15 AV2 B 39 57 11 AV5 B 33 104 16 AV2 B 35 68 19 AV3 B 39 59 14 AVl B 33 104 13 AV4 B 35 68 24 AV4 B 39 60 11 AVl B 33 107 15 AV3 B 35 68 27 AV5 B 39 60 8 AV2 B 33 107 21 AV5 B 35 71 15 AV3 B 39 60 21 AV3 B 33 109 17 AV4 B 35 98 17 AV3 B 39 60 10 AV4 B 33 109 32 AV5 B 35 98 15 AV4 B 40 48 36 AV2 B 34 14 16 AV5 B 35 104 14 AV3 B 40 48 16 AV2 B 34 14 19 AV6 B 35 104 18 AVG B 40 48 40 AV3 B 34 70 20 AV2 B 36 59 15 AV2 B 40 48 35 AV4 B 34 70 17 AV3 B 36 59 9 AV6 B 40 48 35 AV5 B 34 70 13 AV4 B 36 64 10 AV3 B 40 48 17 AV6 B 34 72 18 AV2 B 36 64 16 AV4 B 40 74 11 AV2 B 34 82 10 AV2 B 36 65 30 AV2 B 41 61 17 AV2 B 34 85 15 AV2 B 36 65 18 AV3 B 41 61 20 AV4 B 34 85 11 AV6 B 36 65 11 AV4 B 41 61 16 AV5 B 34 94 16 AV2 B 36 65 19 AV5 B 41 75 20 AV2 B 34 94 15 AV5 B 37 54 9 AV2 B 41 75 22 AV3 B 34 94 14 AV6 B 37 54 17 AV4 B 41 75 20 AV4 B 34 98 14 AV2 B 37 58 7 AV3 B 41 75 13 AV5 B 34 98 17 AV3 B 37 69 24 AV2 B 42 64 10 AV2 B 34 100 14 AV5 B 37 87 17 AV2 B 42 64 10 AV5 B 34 100 16 AV6 B 37 87 18 AV3 B 42 81 21 AV2 B 34 101 16 AV2 B 38 41 11 AV6 B 42 103 14 AV4 B 34 101 14 AV6 B 39 48 12 AV2 B 43 20 11 AV2 B 34 103 17 AV5 B 39 48 20 AV3 B 43 69 15 AV2 B 34 103 19 AV6 B 39 48 17 AV4 B 43 69 14 AV3 B 34 105 17 AV6 B 39 48 17 AV5 B 43 69 22 AV4 B 35 44 18 AVl B 39 49 10 AVl B 43 69 23 AV5 B 35 44 15 AV2 B 39 49 24 AV2 B 43 75 24 AV2 B 35 55 13 AV4 B 39 49 28 AV3 B 43 75 19 AV3 Page 18 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non..SCC) SG Row Col Per Locn SG Row Col Per Locn* SG Row co*1 'Per Locn B 43 75 29 AV4 B SS 63 11 AV3 c 27 115 13 AV2 B 43 75 27 AVS B SS 69 11 AV2 c 28 66 18 AV2 B 43 96 19 TSH B SS 69 11 AV3 c 28 104 24 osc B 44 62 9 AV2 B 56 69 14 AV2 c 30 11 15 AV1 B 44 62 10 AV4 B 56 71 11 AV2 c 30 11 12 AVS B 45 27 11 AV6 B 56 82 22 AVS c 30 11 13 AV6 B 45 33 16 AV2 B 57 50 16 AV6 c 30 113 19 AV2 B 45 41 16 AV2 B 57 69 12 AV2 S8 S7 8 AV2 c 30 113 15 AVS B 45 41 14 AV3 B B 45 41 15 AV4 c 30 113 12 AV6 B 45 47 12 AVS c 30 114 17 AV2 B 45 74 14 AV2 c 30 114 11 AVS B 45 86 18 AV1 SG Row Col Per Loch c 30 114 10 AV6 B 46 66 7 AV3 c 1 87 34 TSH c 31 111 17 AVS B 47 71 13 AV1 c 1 87 13 TSC c 32 24 24 04H B 47 71 20 AV2 c 1 112 22 TSH c 32 35 10 07C B 47 71 27 AV3 c 1 112 16 TSC c 32 110 11 AV3 B 47 71 13 AV4 c 3 90 23 07C c 33 42 18 AV4 B 47 74 17 AV2 c 3 113 33 osc c 33 42 14 AV6 B 48 25 14 AVS c 5 57 26 06C c 33 106 14 AV2 B 48 71 11 AV4 c 6 39 23 06C c 33 106 15 AV3 B 49 33 14 AV2 c 9 67 10 AV1 c 33 106 20 AV4 B 49 78 17 AV2 c 9 74 11 AV1 c 33 111 15 AV2 B 49 78 20 AV4 c 10 63 17 AV1 c 33 111 16 AVS B 50 93 14 AV2 AV4 c 10 63 16 AV6 c 34 28 16 AV4 B 50 93 15 B 50 95 16 AV6 c 10 64 14 AV1 c 34 28 14 AVS B 51 70 12 AVS c 11 67 19 AV1 c 35 13 12 AV1 B 51 70 17 AV6 c 11 72 11 AV1 c 35 13 24 AV2 B 53 34 24 AV6 c 14 62 14 AV1 c 35 13 12 AV3 B 53 44 12 AV6 c 15 35 12 AV1 c 3S 13 22 AV4 B 53 90 15 AV4 c 15 64 15 AV1 c 35 13 31 AVS B 53 90 21 AVS c 15 67 15 AV1 c 35 13 17 AV6 B 53 90 15 AV6 c 16 37 13 AV6 c 36 43 12 AV2 B 54 36 19 AVS c 19 S9 14 AV1 c 37 17 11 AVS B 54 66 8 AV3 c 19 62 14 AV1 c 37 23 12 AV1 B 54 86 16 AV2 c 22 34 17 AV2 c 37 23 13 AV4 B 54 86 13 AV4 c 24 7 1S AV1 c 37 23 14 AVS B 54 86 16 AVS c 24 7 13 AV6 c 37 40 14 AV2 B 54 87 20 OlC c c 24 98 11 AV1 37 40 16 AV3 B 54 87 14 AV3 c 25 10 11 AV1 c 37 40 11 AV4 B 54 87 23 AVS c 25 56 14 AV2 c 37 40 12 AVS B 55 SS 15 AV3 c 26 8 14 AV1 c 37 40 13 AV6 Page 19 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per Locn SG Row Col Per
- Locn c 37 47 17 AV4 c 41 30 17 AV6 c 42 92 20 AV3 c 37 47 11 AV5 c 41 39 26 AV2 c 42 92 14 AV4 c 37 55 19 AV2 c 41 39 22 AV4 c 42 92 15 AV5 c 37 56 14 AV2 c 41 39 24 AV5 c 42 102 12 AVl c 37 78 14 AV5 c 41 39 23 AV6 c 42 102 15 AV2 c 37 83 14 AV2 c 41 41 22 AVl c 42 102 33 AV3 c 37 85 18 AV2 c 41 41 35 AV2 c 42 102 31 AV4 c 37 85 18 AV3 c 41 41 23 AV3 c 42 102 14 AV5 c 37 85 17 AV4 c 41 41 21 AV4 c 42 102 16 AV6 c 37 85 18 AV5 c 41 43 18 AV2 c 43 23 15 AVl c 37 85 16 AV6 c 41 43 18 AV3 c 43 23 26 AV3 c 38 79 14 AVl c 41 43 27 AV4 c 43 23 18 AV4 c 38 79 17 AV2 c 41 43 16 AV5 c 43 23 15 AV5 c 38 101 15 AV6 c 41 80 18 AV2 c 43 26 21 TSH c 38 102 15 AV4 c 41 80 32 AV3 c 43 100 15 AV2 c 38 102 18 AV5 c 41 80 22 AV4 c 43 100 14 AV3 c 39 19 18 TSC c 41 80 19 AV5 c 43 100 30 AV4 c 39 42 20 AV2 c 41 93 9 AVl c 43 100 19 AV5 c 39 42 14 AV3 c 41 93 10 AV2 c 43 102 18 AV2 c 39 42 17 AV4 c 41 93 10 AV3 c 43 102 22 AV3 c 39 45 20 AV2 c 41 93 15 AV4 c 43 102 30 AV4 c 39 45 28 AV3 c 41 93 17 AV5 c 43 102 27 AV5 c 39 45 22 AV4 c 41 100 15 AV3 c 43 102 14 AV6 c 39 45 35 AV5 c 41 100 15 AV4 c 44 22 12 AV2 c 39 45 16 AV6 c 41 100 24 AV5 c 44 26 10 TSH c 39 69 21 AV2 c 41 100 12 AV6 c 44 75 22 AVl c 39 69 18 AV3 c 42 23 21 AV4 c 44 75 21 AV2 c 39 69 29 AV4 c 42 23 21 AV5 c 44 100 12 AV2 c 39 69 27 AV5 c 42 24 13 AV6 c 44 100 19 AV3 c 40 36 10 AVl c 42 25 11 AV2 c 44 100 31 AV4 c 40 36 15 AV2 c 42 25 10 AV3 c 44 100 31 AV5 c 41 22 16 AV2 c 42 25 13 AV4 c 44 100 14 AV6 c 41 22 18 AV3 c 42 25 14 AV5 c 45 23 10 OlC c 41 22 15 AV4 c 42 25 12 AV6 c 45 24 13 OlC c 41 22 17 AV5 c 42 31 13 AVl c 46 36 18 AV2 c 41 22 17 AV6 c 42 31 23 AV2 c 46 36 23 AV3 c 41 23 14 AVl c 42 31 11 AV3 c 46 36 30 AV4 c 41 23 15 AV5 c 42 56 16 AV2 c 46 36 21 AV5 c 41 23 12 AV6 c 42 71 17 AV2 c 46 79 15 AV2 c 41 30 15 AV4 c 42 71 14 AV5 c 46 79 20 AV3 c 41 30 21 AV5 c 42 92 15 AV2 c 46 79 21 AV4 Page 20 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per Locn c 46 79 16 AVS c 48 30 19 AVS SG Row Col Per Locn c 48 D 1 87 31 TSH c 46 79 18 AV6 30 19 AV6 c 46 97 13 AV3 c 48 33 20 AVS D s 100 28 06H D 6 108 10 03H c 46 97 22 AV4 c 48 3S 17 AV4 D 12 2 14 AVl c 46 97 14 AVS c 48 3S 18 AVS D 13 4 28 OlC c 47 30 20 AVS c 48 47 16 AVl D 16 64 17 AVl c 47 3S 12 AVl c 48 47 16 AV2 D 16 64 lS AV6 c 47 3S 20 AV2 c 48 47 11 AV3 D 17 72 18 AVl c 47 3S 26 AV3 c 48 97 lS AV2 D 17 7S 21 AV6 c 47 3S 27 AV4 c 48 97 14 AV3 D 21 S2 26 04H c 47 3S 16 AVS c 48 97 16 AV4 D 22 86 lS AV2 c 47 40 lS AV2 c 49 9S 27 AVS D 22 93 lS AV2 c 47 40 13 AV3 c Sl 49 17 AVl D 22 93 16 AV6 c 47 40 lS AV4 c Sl 49 23 AV2 D 24 6 23 AVl c 47 40 16 AVS c Sl 49 13 AV3 D 24 6 22 AV6 c 47 40 11 AV6 c Sl 67 14 AV4 D 24 89 14 AVS c 47 S7 14 AV2 c Sl 67 lS AV6 D 24 89 13 AV6 c S3 D 24 91 10 AV2 c 47 62 12 AV4 33 12 AV3 D 24 116 11 AVS c 47 76 18 AVl c S3 3S lS AV2 D 2S 82 20 AV2 c 47 76 18 AV2 c S3 3S 13 AV4 D 2S 82 18 AVS c 47 83 lS AVS c S3 63 14 AV2 D 26 8 18 AVl c 47 86 16 AV4 c S3 67 14 AVl D 26 8 19 AV6 c 47 86 20 AVS c S3 67 30 AV2 D 26 40 12 AVl c 47 93 11 AV1 c S3 67 32 AV3 D 26 40 17 AVS c 47 93 21 AV3 c S3 67 24 AV4 D 26 41 19 AV2 c 47 93 22 AV4 c S3 70 lS AVl D 26 41 19 AVS c 47 93 32 AVS c S3 70 22 AV2 D 26 S2 14 AV2 c 47 94 12 AV2 c S3 70 16 AV3 D 26 83 12 AV2 c 47 94 14 AV3 c S4 3S 12 AV4 D 26 114 12 AV2 c 47 94 21 AV4 c S4 37 13 AVl D 27 8 lS AVl c 47 94 17 AVS c S4 39 16 AV1 D 27 8 28 AV6 c 47 94 13 AV6 c S4 68 20 AV2 D 27 36 18 AVS c 47 96 10 AV3 c S4 87 13 AV3 D 27 39 29 AV2 c S4 D 27 39 34 AVS c 47 96 14 AVS 87 16 AV4 D 27 39 24 AV6 c 47 96 11 AV6 c S4 87 22 AVS D 27 44 27 AV2 c 47 98 14 AV3 c SS 39 13 AVl AVl D 27 76 16 c 47 98 16 AV4 c S6 6S 14 AV3 D 27 76 22 AV2 c 47 99 14 AV4 c S8 Sl 14 AV6 D 27 76 20 AVS c 47 99 26 AVS c S9 67 13 AV6 D 27 89 13 AVl c 47 99 2S AV6 D 27 89 10 AV2 c 48 30 16 AV4 Page 21 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row, Co:1** Per Locn SG Row tol Per . Locn; SG Row Col Per locn D 27 96 1S AVS D 34 3S lS AVS D 3S 69 lS AV6 D 27 96 14 AV6 D 34 40 18 AV4 D 3S 71 12 AVl D 27 111 1S AVS D 34 40 20 AVS D 3S 71 20 AV2 D 27 11S 24 AV2 D 34 40 24 AV6 D 35 71 18 AV3 D 27 11S 16 AVS D 34 43 20 AV2 D 3S 83 18 AV3 D 28 69 13 AV2 D 34 48 lS AVS D 3S 83 18 AV4 D 28 88 12 AVS D 34 so 16 AV2 D 3S 86 16 AV4 D 28 11S 17 AV2 D 34 so 16 AV3 D 3S 86 16 AV6 D 28 11S 2S AVS D 34 69 24 AV2 D 3S 88 17 AV2 D 29 34 31 AV2 D 34 69 23 AV3 D 3S 88 14 AV3 D 29 34 26 AVS D 34 69 34 AV4 D 3S 88 20 AV4 D 29 83 1S AV1 D 34 69 30 AVS D 3S 89 17 AV2 D 29 83 17 AVS D 34 69 14 AV6 D 3S 89 17 AV3 D 29 113 14 AV2 D 34 70 11 AV2 D 36 16 14 AV3 D 30 12 1S AV1 D 34 71 19 AV2 D 36 40 21 AV2 D 30 12 14 AVS D 34 73 33 AV2 D 36 40 18 AV3 D 30 66 23 AV2 D 34 73 2S AV3 D 36 40 19 AV4 D 30 66 2S AVS D 34 73 31 AV4 D 36 40 16 AVS D 31 113 18 AV1 D 34 73 23 AVS D 36 40 18 AV6 D 32 12 20 AV1 D 34 73 18 AV6 D 36 41 23 AV2 D 32 12 1S AV2 D 34 7S 12 AV3 D 36 46 16 AVS D 32 12 19 AV3 D 34 76 18 AV2 D 36 67 23 AV2 D 32 12 37 AVS D 34 76 19 AV3 D 36 67 10 AV3 D 33 58 16 AV1 D 34 76 19 AV4 D 36 80 lS AV3 D 33 58 16 AV2 D 34 76 19 AVS D 36 82 19 AVl D 33 S8 12 AV3 D 34 92 12 AV4 D 36 82 30 AV2 D 33 96 10 AV1 D 34 103 18 AV3 D 36 82 21 AV3 D 33 96 16 AV2 D 34 109 23 AVS D 36 82 26 AV4 D 33 107 1S AV4 D 3S 22 13 AV3 D 36 82 27 AVS D 34 1S 1S AV1 D 3S 22 14 AV4 D 36 90 lS AV2 D 34 1S 19 AV4 D 3S 22 12 AV6 D 37 16 16 AV1 D 34 17 14 AV1 D 3S 37 28 AV2 D 37 16 14 AV2 D 34 17 16 AV2 D 3S 37 22 AV3 D 37 16 23 AV3 D 34 17 16 AV3 D 3S 37 lS AV6 D 37 16 18 AV4 D 34 17 16 AV4 D 3S Sl lS AV1 D 37 16 14 AV5 D 34 22 17 AV2 D 3S Sl 14 AV2 D 37 16 18 AV6 D 34 22 18 AV3 D 3S Sl 11 AV4 D 37 19 16 AV6 D 34 22 16 AV4 D 3S S3 17 AV3 D 37 38 18 AV2 D 34 22 15 AVS D 3S 53 17 AV4 D 37 38 16 AV3 D 34 22 16 AV6 D 3S 69 32 AV2 D 37 38 22 AV4 D 34 30 18 AV3 D 3S 69 34 AV3 D 37 38 17 AVS D 34 30 17 AVS D 3S 69 19 AV4 D 37 39 18 AV2 D 34 3S 17 AV2 D 3S 69 12 AVS D 37 39 19 AV3 Page 22 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per Locn SG Row Col Per L()cn D 37 39 22 AV4 D 39 38 13 AV3 D 40 23 20 AV4 D 37 39 21 AVS D 39 41 16 AV2 D 40 24 16 AV2 D 37 39 17 AV6 D 39 41 21 AV3 D 40 24 17 AV3 D 37 40 18 AV3 D 39 41 27 AV4 D 40 24 16 AV4 D 37 40 17 AV4 D 39 41 19 AVS D 40 24 18 AVS D 37 40 17 AV6 D 39 41 16 AV6 D 40 26 18 AV3 D 37 4S 20 AV2 D 39 44 16 AVl D 40 66 17 AVl D 37 4S 14 AV3 D 39 44 22 AV3 D 40 66 34 AV2 D 37 4S 14 AV4 D 39 44 20 AV4 D 40 66 2S AV3 D 37 4S 12 AVS D 39 44 23 AVS D 40 66 36 AV3 D 37 48 10 AVl D 39 44 21 AV6 D 40 66 27 AV4 D 37 48 16 AV2 D 39 so 14 AV2 D 40 66 23 AV4 D 37 48 21 AV3 D 39 so 20 AV3 D 40 66 30 AVS D 37 48 18 AV4 D 39 so 17 AV4 D 40 66 23 AV6 D 37 48 14 AVS D 39 so 18 AVS D 41 18 14 AV4 D 37 48 13 AV6 D 39 S7 13 AVl D 41 20 23 AV2 D 37 S8 26 AV2 D 39 S7 23 AV2 D 41 20 2S AV3 D 37 S8 19 AV3 D 39 S7 2S AV3 D 41 20 27 AV4 D 37 S9 18 AV2 D 39 S7 lS AV4 D 41 20 30 AVS D 37 S9 19 AV3 D 39 S7 21 AVS D 41 20 18 AV6 D 37 S9 21 AV4 D 39 S9 19 AV3 D 41 34 lS AV2 D 37 S9 13 AVS D 39 62 22 AV2 D 41 34 16 AV3 D 37 73 17 AV2 D 39 74 18 AV2 D 41 34 lS AV4 D 37 77 14 AVl D 39 7S 14 AV2 D 41 3S 20 AV3 D 37 77 22 AV2 D 39 82 17 AVl D 41 36 14 AVl D 37 77 29 AV3 D 39 82 26 AV2 D 41 36 18 AV3 D 37 77 31 AV4 D 39 82 23 AV3 D 41 38 20 AV3 D 37 77 14 AVS D 39 82 19 AV4 D 41 38 lS AV4 D 37 84 18 AV4 D 39 82 19 AVS D 41 Sl 16 AV2 D 37 84 22 AV6 D 39 89 17 AVl D 41 Sl 20 AV3 D 37 lOS 14 AV4 D 39 89 18 AV2 D 41 S6 20 AVl D 38 3S lS AV6 D 39 94 16 AV2 D 41 S6 36 AV2 D 38 73 21 AV2 D 39 94 17 AV3 D 41 S6 31 AV3 D 38 73 19 AV3 D 39 94 14 AV4 D 41 S6 27 AV4 D 38 73 19 AV4 D 39 96 13 AVS D 41 S6 3S AVS D 38 73 lS AVS D 39 102 19 AVl D 41 S6 24 AV6 D 39 18 16 AVl D 39 103 20 AVl D 41 S9 17 AV3 D 39 18 16 AV4 D 39 103 17 AV2 D 41 S9 27 AV4 D 39 18 22 AVS D 40 19 12 AVl D 41 66 31 AV2 D 39 19 19 AV2 D 40 21 21 AV2 D 41 66 23 AV3 D 39 19 21 AV3 D 40 21 18 AV3 D 41 66 19 AV4 D 39 24 19 AV2 D 40 21 13 AV6 D 41 66 19 AVS D 39 36 16 AVS D 40 23 18 AVl D 41 71 16 AV2 Page 23 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row* Col Per Locn SG *Row Col Per* Locn. D 41 90 17 AV2 D 43 21 26 AV5 D 46 25 23 AV5 D 41 104 16 AV2 D 43 21 31 AV6 D 46 25 20 AV6 D 41 104 17 AV5 D 43 22 14 AV4 D 46 30 21 AV3 D 42 19 11 03C D 43 24 12 AV2 D 46 30 32 AV4 D 42 19 18 AVl D 43 24 15 AV3 D 46 30 35 AV5 D 42 19 22 AV3 D 43 24 15 AV5 D 46 32 14 AV2 D 42 19 19 AV4 D 43 49 18 AV3 D 46 32 11 AV6 D 42 19 17 AV5 D 43 51 16 AV2 D 46 38 18 AV2 D 42 20 19 AV6 D 43 51 15 AV3 D 46 38 20 AV3 D 42 24 17 AVl D 43 51 13 AV4 D 46 38 37 AV4 D 42 24 20 AV2 D 43 51 26 AV5 D 46 38 38 AV5 D 42 24 15 AV3 D 43 54 16 AV2 D 46 38 20 AV6 D 42 24 29 AV4 D 44 26 15 AVl D 46 39 21 AV4 D 42 24 17 AV5 D 44 26 18 AV2 D 46 39 36 AV5 D 42 37 25 AV2 D 44 26 16 AV3 D 46 39 18 AV6 D 42 37 24 AV3 D 44 26 22 AV4 D 46 42 26 AV4 D 42 37 18 AV4 D 44 26 17 AV5 D 46 42 27 AV5 D 42 37 17 AV6 D 44 36 15 AVl D 46 42 16 AV6 D 42 39 15 AV3 D 44 36 16 AV2 D 46 60 17 AV4 D 42 39 19 AV4 D 44 36 23 AV3 D 46 98 14 AV3 D 42 40 14 AV6 D 44 45 16 AV2 D 47 28 13 AV4 D 42 46 17 AV2 D 44 45 20 AV3 D 47 49 35 AV2 D 42 46 29 AV3 D 44 45 25 AV5 D 47 49 24 AV3 D 42 46 21 AV4 D 44 45 10 AV6 D 47 53 20 AV4 D 42 46 23 AV5 D 44 48 18 AV2 D 47 53 27 AV5 D 42 47 18 AV2 D 44 48 33 AV3 D 47 53 20 AV6 D 42 47 20 AV3 D 44 48 19 AV4 D 47 61 23 AV4 D 42 47 20 AV4 D 44 48 25 AV5 D 47 61 12 AV6 D 42 47 18 AV5 D 44 48 16 AV6 D 47 92 13 AV3 D 42 77 17 AV5 D 44 69 15 AV2 D 47 97 14 AV3 D 42 92 12 AVl D 44 91 25 AV2 D 47 97 18 AV5 D 42 92 13 AV2 D 44 91 34 AV3 D 48 65 17 AV4 D 42 92 16 AV3 D 44 91 32 AV4 D 49 27 17 AV3 D 42 92 19 AV4 D 44 91 29 AV5 D 49 28 22 AV5 D 42 92 21 AV5 D 44 91 14 AV6 D 49 28 19 AV6 D 42 92 19 AV6 D 44 101 16 AV3 D 49 36 15 AV2 D 42 98 19 AV3 D 44 102 19 AV5 D 49 36 18 AV4 D 42 98 16 AV4 D 45 27 17 AV5 D 49 36 14 AV5 D 42 98 21 AV5 D 45 40 19 AV5 D 49 36 15 AV6 D 42 98 18 AV6 D 45 40 16 AV6 D 49 41 14 AV2 D 43 21 24 AV2 D 45 66 12 AVl D 49 42 13 AV6 D 43 21 29 AV3 D 45 66 21 AV2 D 49 43 17 AVl D 43 21 18 AV4 D 46 25 17 AV4 D 49 43 16 AV2 Page 24 of 25
SBK-L-20127 Appendix C - OR20 List of Imperfections (non-SCC) SG Row Col Per Locn SG Row Col Per Locn D 49 43 14 AV5 D 53 89 23 AV6 D 49 52 18 AVl D 54 43 15 AV2 D 49 52 34 AV2 D 54 43 17 AV4 D 49 52 25 AV3 D 54 58 16 AV2 D 49 52 22 AV4 D 55 39 12 AV3 D 49 52 15 AV5 D 55 41 14 AV2 D 49 52 20 AV6 D 55 76 15 AV4 D 49 55 13 AVl D 55 82 17 AV2 D 49 55 18 AV2 D 56 41 30 AV2 D 49 55 15 AV3 D 56 41 12 AV3 D 49 81 28 AV4 D 56 41 34 AV4 D 49 81 23 AV5 D 56 41 30 AV5 D 49 82 15 AV6 D 56 41 21 AV6 D 49 87 17 AV3 D 56 43 16 AV2 D 49 87 25 AV4 D 56 43 16 AV3 D 49 93 19 AV6 D 56 65 19 AV3 D 49 94 16 AVl D 56 69 16 AV3 D 49 94 19 AV2 D 56 69 20 AV4 D 49 94 20 AV3 D 56 69 26 AV5 D 49 94 23 AV5 D 56 69 21 AV6 D 49 94 17 AV6 D 56 81 17 AV5 D 50 44 18 AV2 D 56 81 15 AV6 D 50 44 15 AV3 D 56 82 15 AVS D 50 50 25 AV4 D 56 82 15 AV6 D 50 89 20 AV6 D 57 72 9 AV5 D 50 93 19 AV5 D 58 58 15 AVl D 50 94 18 AV4 D 58 58 17 AV6 D 50 94 26 AV5 D 58 75 19 AV2 D 50 94 31 AV6 D 58 75 14 AV5 D 51 62 14 AV2 D 58 75 16 AV6 D 52 33 16 AVl D 59 59 16 AV5 D 52 33 19 AV3 D 59 60 11 AVl D 52 33 35 AV4 D 59 62 16 AV5 D 52 33 22 AV5 D 59 66 16 AVl D 52 33 21 AV6 D 52 35 20 AV2 D 52 35 29 AV3 D 52 35 16 AV4 D 52 35 33 AV5 D 52 35 19 AV6 D 53 34 13 AV4 D 53 43 15 AV2 D 53 62 18 AVl Page 25 of 25}}