L-2022-072, Steam Generator Tube Inspection Report

Steam Generator Tube Inspection Report

ML22126A104
Person / Time
Site:	Turkey Point
Issue date:	05/06/2022
From:	Lesniak T Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2022-072
Download: ML22126A104 (13)

Text

May 6, 2022 L-2022-072 10 CFR 50.36

U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-00001

Re: Turkey Po int Unit 3 Docket No. 50-250 Steam Generator Tube Inspection Report

The attached Turkey Point Unit 3 Cycle 32 Refueling Outage Steam Generator Tube Inspection Report is subm itted in accordance with Turkey Point Technical Specification, 6.9.1.8 and within 180 days after the initial entry to MODE 4 following completion of the inspections performed in accordance with Technical Specification 6.8.4.j, Steam Generator (SG) Program.

Should there be any questions, please contact Mr. Steve Catron, Nuclear Licensing &

Regulatory Compliance Director at 561-304-6206.

Sincerely,

~~~

General Manager, Regulatory Affairs Florida Power & Light Company

Enclosure

cc: Regional Administrator, Region II, USNRC.

Senior Resident Inspector, USNRC, Turkey Point Plant

Florida Power & Light Company

9760 SW 344 St Homestead, FL 33035 L-2022-072 Enclosure

Turkey Point Unit 3 (TP3-32)

Steam Generator Tube Inspection Report L-2022-072 Page 1 of 11 Enclosure Turkey Point Unit 3 TP3-32 Steam Generator Tube Inspection Report

Introduction:

The enclosed Steam Generator Tube Inspection Report for Turkey Point Unit 3 is submitted for the inspection of the SGs during refueling outage 32 (hereafter referred to as the TP3-32 or EOC-31 inspection or outage), as required by Technical Specification section 6.9.1.8. Per the Turkey Point Unit 3 Technical Specification section 6.8.4.j, the TP3-32 SG inspection fell within the 4 th ISi period.

The prior inspection of the SGs was in TP3-29 (Spring 2017). The last SG inspection was originally scheduled to be in TP3-31 (Spring 2020); however, it was deferred by license amendment to TP3-32 due to circumstances related to the effects of the Covid-19 pandemic 1. The TP3-32 inspection was the final inspection of the SGs in the 4 th ISi period as permitted by the license amendment. At unit shutdown for the TP3-32 inspection, the SGs had operated for approximately 31.5 EFPY since installation and 73.86 EFPM in the 4 th ISi period. This included operation for approximately 16.66 EFPM, 16.46 EFPM and 16.35 EFPM, in the last 3 consecutive fuel cycles, respectively, since the last SG inspection (TP3-29). Initial entry into Mode 4 following completion of the TP3-32 inspection was made on November 10, 2021. References to past SG Reports for Turkey Point Unit 3 are provided in Appendix A along with a list of acronyms used in this report.

Turkey Point Unit 3 is a Westinghouse 3-loop PWR with Model 44F steam generators. The SGs are U tube heat exchangers with tube bundles fabricated using thermally treated Alloy 600 tubing. Each SG contains 3,214 tubes arranged in 45 rows and 92 columns, in a square-pitch configuration. Nominal tube OD is 0.875 inches with a 0.050-inch nominal wall thickness. Each SG tube bundle is supported by one drilled-hole flow distribution baffle (FOB) and 6 quatrefoil, broached-hole tube support plates (TSPs) all fabricated from stainless steel. Two (2) sets of anti-vibration bars (AVBs) in the U-bends also provide tube bundle support. Rows 1-8 of tubing in each SG were stress relieved in the U-bend region after bending.

A. Scope of Inspections Performed on each SG The TP3-32 inspection scope was selected to meet the requirements of plant Technical Specifications, NEI 97-06 Rev 3 and its referenced EPRI SGMP Guidelines. In addition, since Turkey Point plant has submitted a License Amendment Request 2 to adopt "Revised Frequencies for Steam Generator Tube Inspections" (TSTF-577 Rev 1) the SG inspection in TP3-32 is considered as the implementation outage to align the scope of the SG Program with TSTF-577 Rev 1 requirements.

Unless otherwise noted, the TP3-32 base scope inspection in each SG was:

Primary-side:

• 100% full-length bobbin probe examination of all active tubes except U-bends of low row tubes.

• U-bends of low row tubes (rows 1 & 2) examined between the uppermost TSP in the HL and CL using the +Point' probe.

• 100% of tubes in the HL tubesheet program examined using the array probe. The test extent was from the first broached TSP (designated 01 H) to the tube-end (TEH).

- Includes TTS peripheral tube exams in the HL for foreign object wear as well as all BLG /OXP indications in the tubesheet.

1 Turkey Point Unit 3 - Issuance of Exigent Amendment No. 291 concerning the deferral of Steam Generator Inspections (NRG ADAMS Accession No. ML201048527)

2 Turkey Point Units 3 and 4, Improved Technical Specifications Conversion, Volume 16, Revision 0, Section 5.0, Administrative Controls (NRG ADAMS Accession Number ML21265A387).

L-2022-072 Page 2 of 11 Enclosure

• TTS peripheral tube exams in the CL completed using the array probe for the 3 outermost tubes exposed to the annulus and all tubes in rows 1-3 along the no-tube lane. The test extent was from 01C to TEC.

• All "high stress" (minus 2-sigma) tubes were inspected with the +Point' probe:

- in the HL tubesheet section (TSH+3" to TEH), and

- at all HL tube support structures and at the uppermost CL TSP.

• 100% of dings/dents >5V in the HL, U-bend and uppermost CL TSP using the +Point' probe.

The extent was from TSH to 06C inclusive.

- All dings/dents <5V were examined with the bobbin probe.

• 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 and tubes adjacent to the locations of known foreign objects.

• 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:

• Visual/cleanliness inspection at the TIS (annulus, no-tube lane) after upper bundle flush and sludge lancing at the TTS.

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

• Upper-bundle visual inspection from the uppermost TSPs.

• Visual inspection of components of the Upper Internals including the feedwater ring & supports, J tubes, and moisture separator components. UT thickness measurements were also obtained at select locations on the feedwater ring.

B. Degradation Mechanisms Found The following degradation mechanisms were identified during the TP3-32 inspection:

• A single axially oriented (SAi), crack-like ODSCC indication was identified in the U-bend of a low row tube (R1C13) in SG-3A.

• Wear at AVB contact points.

• Wear at horizontal tube support structures (FDBs, TSPs).

• Freespan volumetric wear.

Inspection Expansion: This was the first occurrence of a crack-like indication from a tube in the SGs at Turkey Point Unit 3. Since all low row tubes (rows 1-2) were inspected as part of the base scope, a supplemental scope expansion was applied to a 50% sample of tubes in the U-bend of row 3 of SG-3A using the +Point' probe. No additional occurrence of corrosion degradation was identified.

L-2022-072 Page 3 of 11 Enclosure C. NDE Techniques utilized for each Degradation Mechanism Table 1 a is the list of the EPRI ETSSs used for degradation detection during the TP3-32 SG ECT inspection.

Table 1a - NDE Detection Techniques for Degradation Mechanisms Detection ETSS used for Detection Degradation Location / Applicability probe Mechanism 196041.1 Rev 6 AVB locations 96004.1 Rev 13 Wear Broached TSP locations 27091.2 Rev 2 Foreign object wear (with/without part present)

Bobbin 96005.2 Rev 9 Pitting In the freespan and sludge pile 1-28411 Rev 4 At FDBs locations 1-28412 R5, 1-28413 R5 In the freespan 1-28413 Rev 5 At broached TSPs 24013.1 R2, 10013.1 R1 Axial ODSCC At Dents/Dinas ::; 5V 1-28424 R4, 1-28425 R4 At Dents/Dinas > 5V 10411.1 RO, 10411.2 RO All U-bends 128424 Rev4 sludge pile/expansion transition 20511.1 Rev8 Axial PWSCC At expansion transition 111524 Rev 0 Circ PWSCC

+Point' 96511.1 Rev 16 Axial/Circ In low row U-bends 96511.2 Rev 16 PWSCC 27901.1 Rev 1; 27902.1 Rev 2; 27903.1 Rev 1; 27904.1 Rev 2; 27905.1 Rev 2; 27906.1 Rev 1; 27907.1 Rev 2 Wear Foreign object wear (with/without 17901.1 /.3; 17902.1 /.3; part present) 17903.1/.3; 17904.1/.3; 17905.1/.3; 17906.1/.3 Array fAII Rev 01 20400.1 Rev 5 ODSCC At Axial/Circ expansion transition

20500.1 Rev 4 Circ PWSCC At expansion transitions/ BLGs /

20501.1 Rev 4 Axial PWSCC OXPs

Table 1 bis the list of the EPRI ETSSs used for degradation sizing based on the degradation mechanisms reported during the TP3-32 SG ECT inspection.

Table 1 b - NDE Sizing Techniques for Degradation Mechanisms Sizing ETSS used for Degradation Location / Applicability probe Sizing Mechanism Bobbin 196041.1 Rev 6 A VB locations

+Point' 96910.1 Rev 11 10908.4 Rev 1

Bobbin 96004.1 Rev 13 Wear TSP and FOB locations 27905.1 Rev 2 Just above or below TSP or FOB edges

+Point' 21998.1 Rev 4 Foreign object wear (volumetric) at or slightly above TTS 28432.1 Rev. 2 Axial ODSCC U-bend L-2022-072 Page 4 of 11 Enclosure D. Location, orientation (if linear), and measured sizes (if available) of service induced indications Axial ODSCC: A crack-like indication of ODSCC was reported in the U-bend section of a low row tube (R 1 C 13) in SG-3A. The flaw was identified as a single axially-oriented indication (SAi) using the

+Point' probe and was confirmed with the array and magnetically-biased +Point' probes. The indication is located close to the CL bend tangent (06H+9.57") and at the intrados of the tube. Based on the location of this indication (low row U-bend), it was compared to operating experience (OE) in NRC Information Notice IN 2010-21: "Cracklike Indication in the U-bend region of a thermally treated Alloy 600 Steam Generator Tube". The tube did not exhibit the presence of a manufacturing indication similar to a Blairsville bump (as in the OE); however, the indication was coincident with a geometric signal in the tube, like a ding. The ECT indication response was considered a complex signal due to the presence of the ding-like signal. The indication had a voltage amplitude of 0.82V using the +Point probe. The axial length was 0.11 inches, and the maximum depth was 51 % TW as sized by ETSS 128432.

Wear: Appendix B provides a listing, showing locations and measured sizes for the other mechanical tube wear indications reported during TP3-32. For AVB wear, the indication depth as measured by the bobbin probe is shown. For all other locations, the indication depth as measured by the +Point' probe is shown.

E. Number of tubes plugged during the inspection outage for each degradation mechanism Five (5) tubes were plugged based on the TP3-32 inspection; the tubes plugged for each degradation mechanism are summarized below in Table 2:

Table 2 - TP3-32 Tubes Plugged

SG Tube Degradation Mechanism Notes A R1C13 Axial ODSCC (SAi) in low Met the 'plug-on-detection' Tech Spec criteria for plugging.

row U-bend B R18C87 Volumetric indication in the Preventively plugged due to a volumetric (VOL) indication freespan reported at 02H+3.15".

R35C49 AVB Wear Met the '2:40%TW' Tech Spec criterion for plugging at locations AV3 and AV4. Tube was stabilized as well.

C R33C43, Tubes had unusually high growth. Preventively plugged to R34C31 AVB Wear provide additional margin until the next full-scope SG inspection.

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 3.

Table 3 - Tubes plugged to-date and effective plugging percentage SG-A SG-8 SG-C Total Tubes Plugged 51 84 66 201 Percent Plugged 1.59% 2.61% 2.05% 2.08%

L-2022-072 Page 5 of 11 Enclosure

G. Results of Condition Monitoring, including the results of tube pulls and in-situ testing All indications found in TP3-32 satisfy the condition monitoring (CM) requirements of NEI 97-06 Rev 3 and Turkey Point Technical Specifications for structural and leakage integrity. No indication exceeded the 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 Turkey Point Unit 3 conditions. None of the tubes identified for plugging met the requirements for in-situ pressure testing, and no tube pulls were performed.

1. The axial ODSCC tube indication in the low row U-bend (described in Section D of this report) was assessed for CM and for in-situ testing. A lookback review of prior +Point' probe ECT inspection data (2017) showed a smaller size indication at this location. This was not reported then by the analysis groups - likely due to distortion by the geometric signal. The 201 O

+Point' probe inspection results showed an even smaller indication, distorted by the geometric signal. The 2004 +Point' probe inspection data showed no evidence of tube wall degradation at this location. Line-by-line depth profiling was also completed for this indication using the guidance in ETSS 28432.1. The 95/50 predicted burst pressure exceeded 7,000 psi which is well above the 3xNODP pressure differential of 4,542 psi for Turkey Point Unit 3. The ODSCC indication fell below the screening limits for burst and leakage; therefore, structural integrity requirements were met.

2. The maximum observed AVB wear indication (48%TW) in TP3-32 was less than the CM limit lines for both burst and leakage requirements. The maximum wear indication depths at TSP and FOB locations were 19% and 17%, respectively. These indications fell well below their respective CM limit curves. The freespan volumetric wear indication identified in tube R18C87 (02H+3.15") in SG-38 had a depth of 23% TW and fell below the CM limit curve. No FO wear at the TTS was identified in TP3-32. Leakage potential for accident conditions for the small shallow indications is negligible. Therefore, wear at AVB, TSP and FOB locations, and the freespan volumetric indication met the acceptance criteria for burst and leakage integrity.

3. Channelhead Components Visual Inspection:

- Tube Plug Inspection: During the inspection of tube plugs in TP3-32, 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 Channel head 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". Areas inspected include the divider plate to-channelhead weld, the channelhead-to-tubesheet girth weld seam region, the divider plate, and all cladded surfaces of the channel head bowl and tubesheet. No degradation of the channelhead components was found.

4. Secondary-side Inspections and Maintenance:

- A total of 266 lbs. of sludge was removed from the three SGs based on upper bundle flush and sludge lancing in TP3-32 (85, 110 and 71 lbs. in SGs A, B and C, respectively). The TTS locations of legacy FOs were visually inspected, and 4 newly-identified objects were removed during TTS FOSAR. Two of the FOs (small-grade wire in SG-B, piece of scaffold wire in SG-A) were in the inner bundle (kidney region) of the CL. The other 2 FOs (machine curl, flexitallic gasket) were found in the peripheral region in the HL of SG-C. No tube damage was visually observed in any SG during FOSAR activities. An evaluation is in place for all irretrievable FOs that have the potential to cause tube damage. Upper tube bundle visual inspection performed on all SGs through the uppermost TSP revealed that the L-2022-072 Page 6 of 11 Enclosure broached openings in the TSPs were not occluded. Pieces of scale were also observed on the TSPs. The inspection probe was lowered to other TSPs (through the flow slots) to as far as the 3rd TSP; this inspection revealed that the quatrefoil openings were free/clear of debris. No degradation was noted.

- Upper Internals Inspection: Visual inspections performed in all SGs (for erosion/corrosion, mechanical damage, foreign material and unusual conditions) included the moisture separators, swirl vanes, feedring and J-nozzles. No erosion or corrosion was noted on the separators or swirl vanes. A minimal amount of scouring was observed inside some of the J-tubes at the interface with the feedring; these have been noted previously and do not appear to have changed. The welds of all steam drum components were noted to be intact and no degradation was found.

H. Primary-to-secondary leakage rate observed in each SG during the previous cycle No primary-to-secondary leakage was observed during the previous 3 fuel cycles (cycles 29, 30 and 31) since the last SG inspection.

I. Calculated accident induced leakage rate As described in the H* alternate repair criteria (ARC) for the Turkey Point Plant 3, the accident induced leakage rate from the portion of the tubes below 18.11 inches from the TTS is calculated from any observed normal operating leakage that cannot be attributed to a source other than the tubesheet expansion region. For Turkey Point Unit 3, the maximum operational primary-to secondary leakage rate from the portion of the tubes below 18.11 inches from the top of the tubesheet is determined by multiplying any normal operating leakage by a factor of 1.82 to determine the accident induced leakage rate. Since no operational primary-to-secondary leakage has been observed (per section H of this report), the calculated accident induced leakage rate is zero.

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 tube slippage was completed during the TP3-32 inspections. No tube slippage was reported.

3 Turkey Point Nuclear Generating Station Unit Nos. 3 and 4 - Issuance of Amendments Regarding Permanent Alternate Repair Criteria for Steam Generator Tubes (TAC NOS. ME8515 and ME8516); ADAMS Accession No. ML12292A342 L-2022-072 Page 7 of 11 Enclosure APPPENDIX A - Additional Information

SG Reports in the 4 th ISi Period EOC# Outaqe ADAMS Accession No.

EOC-28 TP3-29 ML17325A998 EOC-29 TP3-30 Skip EOC-30 TP3-31 Skip (Covid-19, ML20095J926)

Abbreviations and Acronyms:

ARC Alternate Repair Criteria NEI Nuclear Energy Institute AVB Anti Vibration Bar NSAL Nuclear Safety Advisory Letter BAG Baffle plate cold OD Outside Diameter BAH Baffle plate hot OXP Over-expansion BLG Bulge PLP Possible Loose Part CL Cold Leg PWSCC Primary Water sec CM Condition Monitoring sec Stress Corrosion Cracking DNG Ding SG Steam Generator DNT Dent SGMP SG Management Program ECT Eddy Current Testing TEC Tube End Cold EFPM Effective Full Power Months TEH Tube End Hot EFPY Effective Full Power Years TS Tubesheet EPRI Electric Power Research Institute TSC Tubesheet Cold ETSS Exam Technique Spec Sheet TSH Tubesheet Hot FDB Flow Distribution Baffle TSP Tube Support Plate FO Foreign Object TTS Top of Tube Sheet FOSAR Foreign Object Search and Retrieval TW Through Wall HL Hot Leg VOL Volumetric indication (used to report ISPT In-Situ Pressure Test freespan wear in TP3-32)

L-2022-072 Page 8 of 11 Enclosure Appendix B - TP3-32 Listing of Wear Indications

Designation used for tube supports: TSP: 01 H - 06H (HL); 01 C - 06C (CL). FOB: BAH or BAC. AVBs: AV1 - AV4 Note: +Point' probe %TWvalues shown in the "UTIL 1" field

SG-3A

Bobbin Wear at AVB's 20-100% +Point Wear (WAR) At Broached Supports 1-100% TWD

ROW COL VOLTS IND %TW LOCATION ROW COL VOLTS IND %TW LOCATION UTIL 1

--- -= =-----=== ---=========;====== =;:;;;====================================

28 59 1. 06 TWD 22 AV2 -0.05 1 7 0.11 WAR 03C -0.59 5 30 52 0.97 TWD 21 AV3 -0.21 0.16 WAR 03C -0.59 10 31 44 0.97 TWD 21 AV3 +0.36 4 11 0.20 WAR 04C -0.96 8 0.22 WAR 04C -0.96 12 Total Tubes 3 0.11 WAR 02H -0.80 8 9 5 0.11 WAR 02H -0.80 4 Total Records: 3 9 6 0.20 WAR 02C +0.88 12 11 11 0.09 WAR 02H -0.69 4 0.10 WAR 02H -0.69 8 Bobbin Wear at AVB's 1-19% 12 19 0.32 WAR 03H -0.69 12 0.37 WAR 03H -0.67 17

ROW COL VOLTS IND %TW LOCATION 13 4 0.08 WAR 05H -0.69 3

=-- -======-================= 0.09 WAR 05H -0.69 7 9 62 0.38 TWD 10 AV4 +0.00 14 4 0.34 WAR 06C -0.80 13 22 44 0.26 TWD 11 AV3 -0.50 0.37 WAR 06C -0.80 17 0.37 TWD 14 AV4 -0.13 15 53 0.30 WAR 04C -0.35 11 24 10 0.29 TWD 11 AV4 -0.11 23 10 0.15 WAR 03H -0.64 6 24 40 0.24 TWD 10 AVl +0.33 0.17 WAR 03H -0.64 11 0.24 TWD 10 AV2 -0.15 33 36 0.25 WAR 03H -0.61 10 25 67 0.42 TWD 11 AV2 -0.33 0.27 WAR 03H -0. 72 14 28 59 0.37 TWD 10 AVl -0.21 36 23 0.28 WAR 05C -0.64 11 0.65 TWD 15 AV3 -0.35 0.29 WAR 05C -0.64 15 0.40 TWD 10 AV4 -0.11 37 24 0.10 WAR 03H -0.88 4 31 13 0.18 TWD 5 AVl +0.32 0.11 WAR 03H -0.88 8 31 41 0.33 TWD 9 AV4 -0.11 37 35 0.24 WAR 05H -0.61 10 31 44 0.33 TWD 9 AV3 -0.33 0.29 WAR 05H -0.67 15 32 42 0.39 TWD 15 AV3 -0.47 33 43 0.28 TWD 8 AV2 -0.02 34 31 0.40 Tl'ID 14 AV2 +0.22 Total Tubes 14 34 46 0.32 TWD 13 AV3 +0.17 Total Records: 26 35 61 0.77 TWD 17 AVl +0.17 38 27 0.41 TWD 11 AV2 +0.24 38 65 0.88 TWD 19 AV3 -0.12

Total Tubes 16 Total Records: 20 L-2022-072 Page 9 of 11 Enclosure Appendix B - TP3-32 Listing of Wear Indications

Designation used for tube supports: TSP: 01 H - 06H (HL); 01 C - 06C (CL). FOB: BAH or BAC. AVBs: AV1 - AV4 Note: +Point' probe% TW values shown in the "UTIL 1" field

SG-38 Bobbin Wear at AVB's 20-100% +Point Wear (WAR) At Broached Supports 1-100% TWD

ROW COL VOLTS IND %TW LOCATION ROW COL VOLTS IND %Ti1 LOCATION UTIL 1

30 42 1.14 TWD 26 AV2 +0.25 5 45 0.32 WAR 02C +0.61 14 1.43 TWD 30 AV3 +0.07 0.38 WAR 02C +0.61 17 1.11 TWD 25 AV4 -0.23 5 87 0.13 WAR 03H -0.61 5 34 59 0.93 TWD 22 AV2 +0.14 0.11 WAR 03H -0.64 11 35 48 1. 31 TWD 30 AV2 +0.09 7 4 0.13 WAR 02C +0.40 7 0.91 TWD 23 AV3 -0.23 0.22 WAR 02C +0.40 12 1.07 TWD 24 AV3 +0.23 13 77 0.12 WAR 02H -0.83 5 0.12 WAR 02H -0.83 9 17 60 0.14 WAR 05H -0.64 6 Total Tubes 3 0.13 WAR 05H -0.64 9 Total Records: 7 18 60 0.30 WAR 05H -0.69 12 0.36 WAR 05H -0.61 17 21 42 0.14 WAR 03C +0.61 7 Bobbin Wear at AVB's 1-19% 0.16 WAR 03C +0.61 10 21 85 0.23 WAR 02H -0.91 9 ROW COL VOLTS IND %TW LOCATION 0.24 WAR 02H -0.91 13 26 41 0.25 WAR 03C +0.59 12 17 31 0.42 TWO 8 AV3 -0.40 0.31 WAR 03C +0.59 15 0.23 TWO 5 AV4 -0.27 27 70 0.24 WAR 03H -0.67 10 24 9 0.36 TWO 10 AV3 +0.04 0.32 WAR 03H -0.59 16 26 20 0.61 TWO 16 AV4 +0.07 28 42 0.12 WAR 03C +0.64 6 26 50 0.50 TWO 14 AV4 +0.00 0.14 WAR 03C +0.64 9 30 42 0.58 TWO 16 AVl +0.00 29 41 0.06 WAR 03C +0.61 3 30 43 0.26 TWO 5 AV2 +0.13 0.09 WAR 03C +0.61 7 32 27 0.43 TWO 12 AV2 +0.21 33 73 0.12 WAR 02H -0.69 5 32 35 0.44 TWD 9 AV4 +0.00 0.16 WAR 02H -0.69 10 34 20 0.46 TWD 9 AV3 -0.49 34 31 0.32 TWD 10 AVl +0.04 0.56 TWD 16 AV2 +0.18 +Point VOL (Volumetric) Indications

0. 71 TWD 19 AV3 +0.37 0.36 TWD 11 AV4 +0.00 ROW COL VOLTS IND %TW LOCATION UTIL 1 34 33 0.62 TWD 17 AV3 -0.05 34 52 0.54 TWD 16 AV4 +0.00 18 87 0.24 VOL 02H +3.15 23 34 53 1.18 TWD 18 AVl +0.09 1.31 TWD 19 AV2 -0.13 0.60 TWO 10 AV3 -0.42 34 59 0.46 TWD 13 AV4 +0.00 Total Tubes 1 0.36 TWO 11 AVl +0.15 Total Records: 1 34 73 0.54 TWD 14 AV2 +0.02 35 62 0.65 TWO 11 AVl +0.00 +Point Wear (WAR) At Baffle Plates 1-100% TWD

0. 72 TWD 12 AV2 +0.51 36 46 0.36 TWD 10 AVl +0.28 ROW COL VOLTS IND %TW LOCATION UTIL 1 37 32 0.37 TWD 11 AV2 +O. 30 40 47 0.56 TWD 10 AV3 -0.07 42 44 0.33 WAR BAH -0.40 14 41 34 0.43 TWD 8 AV2 +0.09 0.39 WAR BAH -0.40 17 42 53 0.41 TWD 8 AV3 -0.26 45 45 0.16 WAR BAH -0.16 8 0.50 TWD 9 AV3 +0.18 0.44 TWO 8 AV4 -0.02 44 37 0.22 TWD 7 AV4 +0.19 0.22 TWD 7 AV4 -0.11 Total Tubes 2 45 46 0.60 TWD 16 AV2 +0.00 Total Records: 3

Total Tubes 23 Total Records: 34 L-2022-072 Page 10 of 11 Enclosure

Appendix 8 - TP3-32 Listing of Wear Indications

Designation used for tube supports: TSP: 01 H - 06H (HL); 01 C - 06C (CL). FOB: BAH or BAC. AVBs: AV1 - AV4 Note: +Point' probe 3/4TW values shown in the "UTIL 1" field

SG-3C Bobbin Wear at AVB's 20-100% +Point Wear (WAR) At Broached Supports 1-100% TWD

ROW COL VOLTS IND %TW LOCATION ROW COL VOLTS IND %TW LOCATION UTIL 1 -== =-- --===========================

-===========;:;

21 38 0. 64 TWD 23 AV2 +0.27 5 68 0.26 WAR 03C -0.56 10 24 59 0.56 TWD 21 AV4 +0.28 0.30 WAR 03C -0.56 15 0.58 TWD 22 AVl +0.05 5 69 0.29 WAR 03C -0.67 11 24 63 0.84 TWD 20 AV3 -0.20 0.27 WAR 03C -0.61 14 26 58 0.94 TWD 29 AVl +0.21 15 82 0.37 WAR 03H -0.93 16 0.41 WAR 03H -0.93 18

0. 97 TWD 30 AV2 +0.16 18 84 0.15 WAR 05H -0.56 7 0.78 TWD 26 AV3 -0.14 0.21 WAR 05H -0.56 12 28 48 1. 38 TWD 26 AV2 +0.00 20 61 0.18 WAR 04H -0.72 8 30 31 0. 72 TWD 25 AV2 +0.24 0.21 WAR 04H -0.72 12 0.78 TWD 26 AV3 +0.05 20 62 0.21 WAR 03H -0.77 10 0.65 TWD 24 AVl -0.26 0.26 WAR 03H -0.77 14 30 61 0.87 TWD 28 AV2 +0.09 23 71 0.20 WAR 06H -0.67 9 33 32 1. 67 TWD 30 AV3 +0.16 0.21 WAR 06H -0.67 12 33 43 1.16 TWD 32 AV2 +0. 09 24 70 0.36 WAR 03H -0.83 15

1. 54 TWD 37 AV3 +0.07 0.40 WAR 03H -0.83 18 33 55 0. 52 TWD 20 AV3 -0.16 27 21 0.25 WAR 02H -0.88 11 34 31 0.96 TWD 30 AV2 +0.14 0.29 WAR 02H -0.88 15

1. 59 TWD 37 AV3 -0.12 29 71 0.12 WAR 03H -0.80 6 34 41 o. 92 TWD 21 AVl +0.26 0.13 WAR 03H -0.80 9 1.20 TWD 25 AV2 -0.07 29 73 0.23 WAR 02H -0.75 11 0.27 WAR 02H -0.75 14 1.29 TWD 26 AV3 -0.16 32 19 0.12 WAR 03H -0.56 6 1.04 TWD 23 AV4 -0.11 35 68 0.12 WAR 03H -0.72 6 34 44 1.17 TWD 32 AV3 -0.16 0.16 WAR 03H -0.72 10 0.78 TWD 26 AV4 +0.00 36 68 0.18 WAR 03H -0.67 9 34 52 0.78 TWD 26 AV3 -0.07 0.23 WAR 03H -0.67 13 35 35 0.56 TWD 21 AV4 +0.07 38 34 0.25 WAR 03H -0.72 11

0. 92 TWD 28 AV3 +0.00 0.28 WAR 03H -0.72 14 35 36 0.70 TWD 24 AV2 +0.00 38 44 0.19 WAR 04H -0.67 9

0. 63 TWD 23 AV3 +0.00 0.23 WAR 04H -0.67 13 35 49 3.20 TWD 46 AV3 -0.14 38 56 0.41 WAR 04H -0.67 17 3.65 TWD 48 AV4 -0.05 0.44 WAR 04H -0.67 19 38 61 0.63 TWD 23 AV2 +0.12 38 65 0.88 TWD 28 AV4 +0.00 0.69 TWD 25 AV3 +0.00 Total Tubes 17 1.00 TWD 30 AV2 +0.12 Total Records: 33 38 71 0.85 TWD 20 AV3 -0.12 39 54 1. 45 TWD 36 AV3 -0.12 1.07 TWD 31 AV4 +0.05 39 55 0.49 TWD 20 AV2 +0.05 40 25 1.67 TWD 30 AV3 -0.05 1.40 TWD 27 AV2 +0.26 40 44 0.83 TWD 27 AV4 -0.11 40 55 0.93 TWD 21 AV4 -0.09

1. 30 TWD 25 AV3 +0.00 42 35 0.90 TWD 20 AV4 -0.09

Total Tubes 26 Total Records: 45 L-2022-072 Page 11 of 11 Enclosure

Appendix B - TP3-32 Listing of Wear Indications Designation used for tube supports: TSP: 01 H - 06H (HL); 01 C - 06C (CL). FOB: BAH or BAC. AVBs: AV1 -AV4 Note: +Point' probe% TW values shown in the "UTIL 1" field SG-3C

Bobbin Wear at AVB's 1-19'!

RO".i" COL VOLTS !ND >'ffi LOCATION ROW COL VOLTS Hill aw.LOC/\\TlON --- --- ---===================

--- -----======,;.,:======

13 39 0.23 Tl'iD 7 AV3 -0.10 36 73 0.25 TWD 7 AV3 +0.14 00 0.18 18 26 0.24 Tl-ID 12 AV2 -0.17 Tl 26 0.29 TWD 8 AV4 0.22 Tim 11 AV3 -0.50 37 27 0.?.6 TWD 8 AV3 -1).10 20 37 0.26 T\\'ID 7 l.V2 *0.(14 37 28 0.55 TWD 14 AV3 -0.20 0.31 Tl*ID 9 hV3 -0.11 0.82 TWD J(j AV4 -0.02 21 38 0.39 Tvm 17 hl/3 -0.07 37 29 o. 6(> TWC* 15 AV4 -(*.27 21 62 0.28 nm 8 A\\Jl -0.11 37 39 (l.40 Tl'lO 17 AV3 H1.00 0.34 TWD 9 AV2 -0.05 3e 25 0,34 TWD lS Al/3 -0.15 23 45 0.44 T\\'ID 12 AV3 -0.09 38 27 0.23 TWD 11 AV4 '"0,02 23 49 0.24 Tl-ID 11 Al/3 -0.11 38 50 0.26 nm 12 AV2 10.12 24 11 1).33 TWD 14 Al/4 -0.21 38 59 0.19 T>'ID 9 AV2 +0.10 24 12 0.27 T\\'iD 12,\\Vl +0.11 38 61 0.45 TWD 18 AV! !0.23 24 43 0.32 Tl'ID 9 AV1 +o. n 3$ 6:3 0.41 TWD 11 1W2 l,24 0.42 Tl-ID 12 lN2 +0,16 38 6G 0.32 TWD 9 AV3 Hl.05 24 57 0.40 T\\10 11 AV2 -0.04 0.27 TWD B !1.V4 +0.02 2-1 59 0.47 'l1WD 19 AVJ +0.21 39 24 0.25 TNr, 7 AV3 -0.02 0.44 TliD 18 Al/2 +0.0"/ 39 ?:8 0.22 TWD 7 AV4 -0.07 24 63 0.36 TliD 10 AV2 +0,27 39 68 0.10 TWD 9 AV2 +0.07 25 62 0.84 Tl10 19 Al/3 +0.23 40 28 0.27 111D 13 Al/3 +0.00 0.68 T\\'ID 16 Al/2 +0.00 0.3,I TWD 15 Al/4 +0.05 26 49 0.21 T\\iD 6 AV3 -0.16 40 44 0.42 *mo 18 AV3 HI.OS 26 82 0,18 TWD 9 Al/3 -0, 12 40 46 o. 31 TWD 14 !N4 -0.14 27 83 0.18 T\\10 6 AV2 +0.09,10 5*, 0.29 TWD 8 lN4.,0.21 28 12 0.26 TWD 13 AVl +0.09 0.26 TWD 7 AV3 +0.09 28 46 o.57 T\\10 14 AV3 +0.0'/ *10 59 0.18 TWD 9 AV3 +0.00.19 AV3 -tl.07 0.29 T\\1D 8 AVl +0.04 42 31 O.?'iJ 'l'l'ID 2$ 60 0.31 T\\'ID 14 AV?. +0.00 42 35 0.33 TWD () AV3 0 0.17 29 14 0.26 TWO 12 AV3 -0.05 42 43 0.35 TWO 10 A\\/1 H).JC 0.23 TWO 11 AV2 +0. 09 42 55 0.30 TWD 8 1\\\\/l +0.22 30 18 0.28 TND l3 Al/3 -0.14 43 33 0.42 TWD 15 A\\/3 -0.;:>5 0.41 nm 19 A\\Jl -0.07 43 34 0,31 TWD 9 P...\\13 -0.10 30 30 0.50 TWO 13 AV4 -0.05 13 35 o.,n TWD 19 AV3 -0.10 1).31 Tl'ID 9 AV3 -0.26 44 36 0.46 'l'WD 19 AV3 l0.00 0.28 T\\10 8 AV2 +O. 00 44 :n 0.35 TWD JO AV3 +0.00 0.34 Tl'ID 9 AV1 +-0.13 30 43 0.32 T\\10 9 1,v1 +0.00 0.36 T\\1D 10,W2 +0.02 Total Tubas Bl 30 51 0,4*1 TliD 18 A\\/2 <0.23 Total Reco1d:;: lOS 30 60 0.23 T\\'ID 11 AV2 +0,00 30 61 0.21 T~ID 10 AV4 -0.19 31 15 0~42 T\\10 11 l\\Vl

• 0.20 31 80 0.20 T\\*ID 6 AV3 -0.21 33 24 1).31 nm 9 AV3 -0.34 0.32 nm 9 AV4 -0.11 33 28 0.49 'l'WD 13 AV3 -0.07 33 31 0.27 Tr/D 8 A\\/2 +0.25

o. 68 nm 17 AV3 +O, 05 0.23 T\\iD 1 AV4 -o. 14 33 32 0.72 TliD l'I Al/2 +0, 17 0.53 Tt1D 14 AV4 -0.02 33 38 o.36 TWD 16 AV3 +0.04 33 45 0.26 T\\'ID 8 A.V2 +0.07 33 46 0.32 T*iD 9 Al/3 -O.l9 33 !)4 0.3$ 'l'WD 10 Al/4 -0.14 0.25 TND 7 Al/3 +0.02 33 55 0.27 TWD 13 AV4 -0.12 33 63 0.32 Tt1D 9 AV4 -o. 02 33 74 0.19 'l'\\1D 6 AV4 -0.02 34 32 0.33 nm 15 Al/3 -0.12 34 38 0.23 TWD 7 Al/3 -o. 09 0.30 TWD 9 AV4 +0.07 34 45 0.29 Tl'iD 13 A\\/2 +0.07 34 52 0,45 TND 19 Al/4 +0.23 34 56 0.2a TliD l:J Al/3 -0. JO 35 51 0.41 TrlD 12 l\\V2 ;.Q.16 35 52 0.,18 'l'*ID 13 Al/3 -0.17 35 54 0.74 TWD 17 AV2 -0.37 0.34 TWD 9 AVl t0.05 35 57 0.30 TWD 14 hV2 *0,01 36 54 0.2$ TWD 12 AV2 -0.09 36 56 0.22 TWD 11 AV3 -0.12