LR-N21-0075, Updated Steam Generator Tube Inspection Report - March 2020 to Reflect TSTF-577 Reporting Requirements
| ML21305A002 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 11/02/2021 |
| From: | Desanctis R Public Service Enterprise Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LR-N21-0075, TSTF-577 | |
| Download: ML21305A002 (17) | |
Text
PSEG Nuclear LLC P.O. Box 236, Hancocks Bridge, NJ 08038-0236 LR-N21-0075 November 1, 2021 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington DC 20555-001 Salem Nuclear Generating Station Unit 1 Facility Operating License No. DPR-70 NRC Docket No. 50-272 0 PSEG NudearLLC Technical Specification 6.9.1.1 0
Subject:
Updated Steam Generator Tube Inspection Report - March 2020 to Reflect TSTF-577 Reporting Requirements
References:
- 1. PSEG letter LR-N21-0036, "Application to Revise Technical Specifications to Adopt TSTF-577, 'Revised Frequencies for Steam Generator Tube Inspections,"' dated April 28, 2021 (ADAMS Accession No. ML21118B060)
- 2. NRC Letter, "Salem Nuclear Generating Station, Unit Nos. 1 and 2 -
Issuance of Amendment Nos. 338 and 320 Re: Revise Technical Specifications to Adopt TSTF-577, 'Revised Frequencies for Steam Generator Tube Inspection' (EPID L-2021-LLA-0077)," dated September 3, 2021 (ADAMS Accession No. ML21202A078)
- 3. PSEG Letter LR-N20-0062, "Steam Generator Tube Inspection Report -
March 2020," dated September 17, 2020 (ADAMS Accession No. ML20261H589)
- 4. PSEG Letter LR-N21-0019, "Response to Request for Additional Information (RAI), Re: Steam Generator Tube Inspection Report (ML20261H589)," dated February 25, 2021 (ADAMS Accession No. ML21056A435)
- 5. NRC Letter, "Salem Nuclear Generating Station, Unit No. 1 - Review of the Spring 2020 Steam Generator Tube Inspection Report (EPID L-2020-LRO-0057)," dated March 25, 2021 (ADAMS Accession No. ML21078A000)
PSEG Nuclear, LLC (PSEG) hereby submits an updated Steam Generator (SG) Tube Inspection Report consistent with the requirements of Technical Specification (TS) 6.9.1.10 as updated by Unit 1 TS Amendment 338 (Reference 2). As documented in Reference 1, an updated SG Tube Inspection Report is required to be submitted within 30 days of implementing the Reference 2 TS amendment. The TS amendment was implemented on October 1, 2021.
The original SG Tube Inspection Report was provided in Reference 3 and reviewed by the NRC as documented in Reference 5.
The following attachments are included in this letter:
Page 2 LR-N21-0075 November 1, 2021 Updated Steam Generator Tube Inspection Report TS 6.9.1.1 O Service Induced Indications (AVB Wear)
Service Induced Indications (Foreign Object Wear)
Summary of Condition Monitoring There are no commitments contained in this letter.
Should you have any questions regarding this submittal, please contact Mr. Brian J. Thomas at (856) 339-2022.
Sincerely, Richard Desanctis Plant Manager - Salem Generating Station Attachments (4) cc:
Mr. D. Lew, Administrator, Region I, NRG Mr. J. Kim, Project Manager, NRG NRG Senior Resident Inspector, Salem Ms. A. Pfaff, Manager IV, NJBNE Corporate Commitment Tracking Coordinator Site Commitment Tracking Coordinator Mr. M. Washington, Chief Inspector - Occupational Safety and Health Bureau of Boiler and Pressure Vessel Compliance
LR-N21-0075 Updated Steam Generator Tube Inspection Report TS 6.9.1.10 LR-N21-0075 UPDATED STEAM GENERATOR TUBE INSPECTION REPORT TS 6.9.1.10 Page 1 of 3 PSEG Nuclear LLC Salem Unit 1 DESIGN AND OPERATING PARAMETERS Salem Unit 1 is a four (4) loop Westinghouse Pressurized Water Reactor (PWR) with Westinghouse Model F SGs that incorporate thermally treated Inconel 600 U-tubes. These SGs were placed into service in 1998 which was the start of operating cycle 13. The tube bundle consists of 5,626 tubes per SG with an outside diameter (OD) of 0.688 inches and a nominal tube wall thickness of 0.040 inches. During SG fabrication, the tubes were hydraulically expanded over the full tubesheet depth and the first ten tube rows were thermally stress relieved after U-bend formation. The seven (7) tube support plates (TSP) are fabricated from 405 stainless steel (SS) and have broached quatrefoil tube holes. A flow distribution baffle (FDB) plate, also 405SS, between the secondary face of the tubesheet and the first tube support plate, provides top-of-tubesheet (TTS) sludge pile control. Tube support within the U-bend region is provided by three V-shaped chrome-plated Inconel 600 anti-vibration bars (AVBs). See Attachment 2 of Reference 3 for a general summary of the Salem Unit 1 Model F SG Tube Support Arrangement and Terminology.
At the time of the March 2020 SG inspection outage, the SGs accumulated a total of approximately 19.4 Effective Full Power Years (EFPY) of operation. Prior to March 2020, all 4 SGs were also inspected in refueling outage 1R25 (October 2017). Between refueling outage 1R25 and March 2020 the SGs were operated approximately 25.2 Effective Full Power Months (EFPM), with a reactor coolant hot leg temperature of approximately 607 degrees Fahrenheit.
PSEG Nuclear LLC has no deviations for Salem Unit 1 of Mandatory or Needed (shall) requirements important to tube integrity from the EPRI Guidelines referenced by NEI 97-06.
SG inspections were performed in accordance with TS 6.8.4.i, Steam Generator Program, during Salem Unit 1 March 2020 steam generator inspection outage. Each reporting requirement of TS 6.9.1.10 is addressed below (items a through i).
Refer to Attachment 1 of Reference 3 for list of terms (acronyms).
- a. Technical Specification 6.9.1.10.a, The scope of inspections performed on each SG Please refer to response provided in Reference 3 for item 6.9.1.10.a, and as supplemented by items 2 and 4 of Reference 4.
- b. Technical Specification 6.9.1.10.b, The nondestructive examination techniques utilized for tubes with increased degradation susceptibility Please refer to response provided in Reference 3 for item 6.9.1.10.a and 6.9.1.10.c.
LR-N21-0075 UPDATED STEAM GENERATOR TUBE INSPECTION REPORT TS 6.9.1.10 Page 2 of 3
- c. Technical Specification 6.9.1.10.c, For each degradation mechanism found:
- 1.
The nondestructive examination techniques utilized; Please refer to response provided in Reference 3 for item 6.9.1.10.a and 6.9.1.10.c.
- 2.
The location, orientation (if linear), measured size (if available), and voltage response for each indication. For tube wear at support structures less than 20 percent through-wall, only the total number of indications needs to be reported; Please refer to response provided in Reference 3 for item 6.9.1.10.d, which provides information including those indications less than 20% through-wall for TSP, FBP, AVB, and Foreign Object (Loose Parts) wear. All TSP and FBP wear are less than 20% through-wall. Attachment 2 and 3 below provides supplemental voltage response information for AVB and Foreign Object wear, equal to or greater than 20% through-wall.
- 3.
A description of the condition monitoring assessment and results, including the margin to the tube integrity performance criteria and comparison with the margin predicted to exist at the inspection by the previous forward-looking tube integrity assessment; Please refer to response provided in Reference 3 for item 6.9.1.10.g, and as supplemented by item 3 of Reference 4.
See Attachment 4 below for further information.
- 4.
The number of tubes plugged during the inspection outage; and Please refer to response provided in Reference 3 for item 6.9.1.10.e.
- d. Technical Specification 6.9.1.10.d, An analysis summary of the tube integrity conditions predicted to exist at the next scheduled inspection (the forward-looking tube integrity assessment) relative to the applicable performance criteria, including the analysis methodology, inputs, and results.
The Operational Assessment from the March 2020 outage tube inspections allows continued operation up to refueling outage 1R29 (fall 2023), conservatively assuming 3.5 EFPY of plant operation (42 EFPM). A full bundle probabilistic model for AVB Wear results in a Probability of Bundle Survival (POS) between 0.997 and 0.998 for all 4 SGs. This equates to a Probability of Burst (POB) of 0.3% or less, and well less than the requirement of 5%. A deterministic analysis was provided for TSP and FBP wear. For TSP wear, a conservative beginning of service (Return to service) flaw size of 25%TW with assumed growth/wear rate of 8%TW per EFPY (for 3.5 EFPY), results in a bounding projected flaw size of 53%TW which is below a LR-N21-0075 UPDATED STEAM GENERATOR TUBE INSPECTION REPORT TS 6.9.1.10 Page 3 of 3 conservative structural depth of 56%TW. Similarly for FBP, a conservative beginning of service (Return to service) flaw size of 29.8%TW with assumed growth/wear rate of 6%TW per EFPY (for 3.5 EFPY), results in a bounding projected flaw size of 50.8%TW which is below a conservative structural depth of 63%TW. The maximum growth/wear rates for TSP and FBP are 1.45%TW/EFPY and 0.97%TW/EFPY, respectively and the estimated EFPY between start of cycle 26 to outage 1R29 is closer to 3.2 EFPY. Items 4 and 5 of Reference 4 provides discussion of loose parts (i.e. - Foreign material), concluding known foreign material not able to be removed from the SGs was evaluated as having no significant consequence to tube integrity and continued plant operation. In summary, these results provide reasonable assurance the performance criteria will not be challenged.
- e. Technical Specification 6.9.1.10.e, The number and percentage of tubes plugged to date, and the effective plugging percentage in each SG.
Please refer to response provided in Reference 3 for item 6.9.1.10.f.
- f. Technical Specification 6.9.1.10.f, The results of any SG secondary side inspections Please refer to response provided in Reference 4 for items 4 and 5.
- g. Technical Specification 6.9.1.10.g, The primary to secondary leakage rate observed in each SG (if it is not practical to assign the leakage to an individual SG, the entire primary to secondary leakage should be conservatively assumed to be from one SG) during the cycle preceding the inspection which is the subject of the report Please refer to response provided in Reference 3 for item 6.9.1.10.h, and as supplemented by item 5 of Reference 4.
- h. Technical Specification 6.9.1.10.h, The calculated accident induced leakage rate from the portion of the tubes below 15.21 inches from the top of the tubesheet for the most limiting accident in the most limiting SG. In addition, if the calculated accident induced leakage rate from the most limiting accident is less than 2.16 times the maximum operational primary to secondary leakage rate, the report should describe how it was determined Please refer to response provided in Reference 3 for item 6.9.1.10.i.
- i. Technical Specification 6.9.1.10.i, The results of monitoring for tube axial displacement (slippage). If slippage is discovered, the implications of the discovery and corrective action shall be provided Please refer to response provided in Reference 3 for item 6.9.1.10.j.
LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 1 of 9 SG Row Column Location Inch
%TW Voltage 11 27 44 AV6 0.26 20 0.50 11 27 80 AV2 0.06 23 0.62 11 29 9
AV5
-0.23 26 0.81 11 29 112 AV2
-0.54 22 0.56 11 29 114 AV6
-0.21 27 0.90 11 32 72 AV4
-0.16 21 0.52 11 34 109 AV2
-0.2 20 0.48 11 35 44 AV5 0.14 24 0.69 11 37 68 AV5
-0.15 20 0.51 11 37 68 AV3
-0.2 22 0.57 11 37 68 AV2 0.15 21 0.55 11 37 79 AV4 0.07 20 0.49 11 38 49 AV4 0.04 25 0.72 11 38 66 AV5
-0.29 27 0.90 11 38 66 AV2 0.25 23 0.62 11 38 105 AV5 0.14 24 0.66 11 38 105 AV3
-0.22 21 0.53 11 38 105 AV2 0.06 20 0.50 11 39 53 AV4
-0.17 21 0.52 11 39 55 AV3
-0.2 24 0.67 11 39 55 AV4
-0.24 29 1.01 11 39 61 AV5
-0.22 21 0.55 11 39 61 AV4
-0.18 22 0.56 11 39 64 AV4 0.06 20 0.51 11 39 64 AV3 0.08 20 0.50 11 39 72 AV4 0.2 29 1.06 11 39 72 AV3
-0.21 30 1.08 11 39 72 AV2 0.17 23 0.61 11 39 74 AV6 0.22 29 1.02 11 39 74 AV5 0.25 37 2.23 11 39 74 AV4
-0.33 37 2.09 11 39 74 AV3
-0.14 27 0.86 11 39 99 AV2
-0.27 32 1.30 11 40 20 AV4 0.04 23 0.63 11 40 20 AV3
-0.14 21 0.52 11 40 43 AV4 0.17 23 0.61 11 40 43 AV3 0.16 27 0.85 11 40 43 AV2
-0.23 29 1.02 11 40 48 AV4 0.14 22 0.58 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 2 of 9 SG Row Column Location Inch
%TW Voltage 11 40 48 AV3 0.16 30 1.13 11 40 48 AV2
-0.18 33 1.43 11 40 58 AV6 0.14 22 0.57 11 40 58 AV3 0.21 22 0.58 11 40 78 AV6
-0.21 24 0.65 11 40 78 AV5 0.25 34 1.59 11 40 78 AV3
-0.42 32 1.29 11 40 78 AV2
-0.19 24 0.67 11 40 79 AV3
-0.18 21 0.54 11 40 89 AV4
-0.2 20 0.49 11 40 98 AV5
-0.14 22 0.58 11 40 104 AV5
-0.2 28 0.92 11 40 104 AV4
-0.18 28 0.91 11 40 105 AV6 0.01 31 1.26 11 40 105 AV5 0.17 26 0.82 11 40 105 AV4
-0.25 31 1.24 11 40 105 AV3 0.06 35 1.66 11 41 103 AV5
-0.04 20 0.51 11 42 33 AV2 0.17 24 0.69 11 42 99 AV4
-0.25 27 0.87 11 42 99 AV3
-0.18 26 0.79 11 43 20 AV5 0.18 20 0.49 11 43 22 AV4 0.16 33 1.48 11 43 25 AV5 0.21 28 0.92 11 43 25 AV4 0.22 21 0.53 11 43 38 AV3 0.08 31 1.17 11 43 38 AV2
-0.2 28 0.93 11 43 38 AV1 0.16 21 0.55 11 43 43 AV5 0.16 24 0.68 11 43 43 AV2 0.15 24 0.69 11 43 44 AV5 0.1 38 2.34 11 43 44 AV4
-0.12 29 0.98 11 43 44 AV3
-0.21 24 0.66 11 43 44 AV2
-0.22 29 1.02 11 43 46 AV6 0.38 22 0.56 11 43 46 AV5
-0.17 25 0.71 11 43 46 AV4 0.21 22 0.56 11 43 49 AV4
-0.17 21 0.52 11 43 75 AV1
-0.28 21 0.52 11 43 79 AV6 0.02 26 0.78 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 3 of 9 SG Row Column Location Inch
%TW Voltage 11 43 79 AV5 0.02 25 0.76 11 43 79 AV4
-0.09 20 0.50 11 43 79 AV2
-0.26 23 0.61 11 43 83 AV4
-0.02 28 0.98 11 43 100 AV3 0.16 28 0.93 11 44 22 AV5 0.02 27 0.84 11 44 41 AV4
-0.18 22 0.56 11 44 45 AV4 0.14 21 0.55 11 44 45 AV3
-0.19 24 0.70 11 44 58 AV4 0.17 28 0.92 11 44 58 AV3 0.22 29 1.01 11 44 60 AV4 0.06 36 1.83 11 44 60 AV3 0.06 23 0.65 11 44 68 AV6
-0.35 33 1.38 11 44 68 AV5
-0.22 28 0.97 11 44 71 AV6 0.16 25 0.71 11 44 74 AV3 0.06 27 0.84 11 44 100 AV5 0.19 31 1.19 11 49 29 AV5 0.12 27 0.90 11 49 85 AV5 0.12 34 1.59 11 49 85 AV4 0.18 30 1.09 11 49 85 AV3 0.17 25 0.72 12 23 89 AV6
-0.27 23 0.60 12 26 74 AV2
-0.04 20 0.49 12 27 8
AV1 0.17 23 0.64 12 27 8
AV6 0.13 25 0.71 12 27 8
AV1
-0.19 26 0.78 12 27 112 AV2 0.2 21 0.54 12 27 115 AV6 0.07 39 2.66 12 29 39 AV2 0.24 21 0.55 12 29 54 AV5
-0.12 22 0.57 12 29 108 AV5 0.02 23 0.65 12 32 109 AV4 0.06 22 0.57 12 32 111 AV5 0.18 26 0.83 12 32 111 AV2 0.05 36 2.01 12 33 108 AV3 0.02 24 0.68 12 33 108 AV5 0.02 24 0.69 12 36 15 AV5 0.16 23 0.65 12 36 15 AV4 0.14 29 1.04 12 38 107 AV3 0.16 25 0.75 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 4 of 9 SG Row Column Location Inch
%TW Voltage 12 38 107 AV2 0.07 24 0.69 12 39 48 AV6 0.22 22 0.58 12 39 54 AV6 0.1 24 0.66 12 39 65 AV3 0.2 26 0.80 12 39 73 AV6
-0.14 23 0.62 12 39 73 AV5 0.29 22 0.58 12 39 73 AV4
-0.27 20 0.49 12 39 73 AV3
-0.27 32 1.29 12 40 24 AV5 0.2 20 0.50 12 40 24 AV4 0.06 20 0.49 12 40 69 AV2 0.16 25 0.71 12 40 80 AV2 0.1 25 0.75 12 40 80 AV4 0.19 32 1.37 12 40 80 AV3 0.18 28 0.92 12 40 83 AV3 0.02 36 1.95 12 40 83 AV2 0.22 35 1.70 12 40 83 AV6 0.18 25 0.75 12 40 83 AV5
-0.38 37 2.06 12 40 83 AV4 0.24 32 1.36 12 40 87 AV5 0.17 22 0.60 12 40 87 AV3 0.21 22 0.59 12 40 87 AV2 0.17 21 0.53 12 40 88 AV5
-0.24 22 0.56 12 40 88 AV3 0.18 29 1.06 12 40 88 AV1 0.09 29 1.00 12 40 94 AV3 0.22 36 1.83 12 40 94 AV2 0.18 33 1.45 12 40 95 AV5 0.16 25 0.75 12 40 95 AV4 0.05 20 0.50 12 40 95 AV3 0.02 21 0.51 12 40 95 AV2 0.19 28 0.97 12 40 95 AV1
-0.16 20 0.50 12 40 96 AV2 0.1 20 0.48 12 41 56 AV3
-0.22 30 1.07 12 41 56 AV2
-0.08 23 0.60 12 41 85 AV3 0.21 25 0.75 12 41 85 AV2 0.2 21 0.53 12 41 87 AV5 0.02 32 1.33 12 41 87 AV4
-0.2 30 1.14 12 41 90 AV2 0.02 23 0.62 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 5 of 9 SG Row Column Location Inch
%TW Voltage 12 41 97 AV4 0.13 21 0.54 12 41 97 AV3
-0.15 22 0.56 12 41 98 AV6
-0.14 21 0.55 12 41 98 AV2 0.19 27 0.85 12 41 100 AV3 0.05 26 0.80 12 41 100 AV2
-0.28 28 0.92 12 41 101 AV6 0.02 31 1.16 12 41 101 AV5 0.18 32 1.32 12 41 101 AV3 0.04 22 0.60 12 41 101 AV2 0.02 30 1.09 12 41 102 AV5 0.07 21 0.55 12 42 46 AV5
-0.26 24 0.68 12 42 51 AV6 0.12 20 0.51 12 43 40 AV5 0.17 29 1.05 12 43 40 AV3 0.01 30 1.11 12 43 40 AV2 0.23 32 1.29 12 45 67 AV1
-0.16 21 0.55 12 46 97 AV5 0.15 23 0.65 12 49 96 AV5
-0.2 27 0.86 12 51 82 AV1
-0.22 20 0.49 12 52 80 AV2 0.2 26 0.79 12 52 80 AV1
-0.19 20 0.51 13 19 80 AV6
-0.04 22 0.59 13 23 117 AV1 0.49 20 0.50 13 25 7
AV1
-0.24 20 0.49 13 25 7
AV6 0.28 26 0.81 13 30 46 AV2 0.37 23 0.65 13 32 15 AV2
-0.13 22 0.60 13 34 48 AV4
-0.28 26 0.80 13 34 48 AV1 0.14 20 0.51 13 36 80 AV3
-0.17 30 1.10 13 36 87 AV2 0.08 21 0.55 13 36 88 AV5 0.02 22 0.56 13 36 88 AV4 0.04 28 0.94 13 38 53 AV3
-0.07 22 0.59 13 38 53 AV2
-0.16 34 1.64 13 38 58 AV5
-0.3 22 0.56 13 38 63 AV5
-0.39 21 0.54 13 38 63 AV4 0.12 24 0.67 13 38 63 AV3 0.16 21 0.52 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 6 of 9 SG Row Column Location Inch
%TW Voltage 13 38 64 AV3 0.11 20 0.49 13 38 72 AV4 0.18 29 1.05 13 38 72 AV3 0.06 26 0.83 13 38 72 AV2 0.15 29 1.00 13 38 81 AV3
-0.16 20 0.49 13 38 83 AV5 0.14 33 1.43 13 38 83 AV4
-0.27 29 1.03 13 38 83 AV3
-0.16 31 1.22 13 38 83 AV2 0.1 25 0.72 13 38 88 AV3 0.04 23 0.65 13 38 91 AV5
-0.12 23 0.62 13 38 91 AV2 0.06 22 0.60 13 38 98 AV3 0.02 23 0.62 13 38 98 AV2 0.22 21 0.55 13 38 101 AV5 0.16 23 0.62 13 39 35 AV5 0.16 27 0.90 13 39 38 AV5
-0.32 27 0.90 13 39 38 AV3
-0.56 26 0.80 13 39 38 AV2 0.22 21 0.52 13 39 46 AV2
-0.18 23 0.61 13 39 54 AV3 0.22 22 0.57 13 39 57 AV4 0.12 23 0.62 13 39 57 AV3 0.06 24 0.68 13 39 65 AV2
-0.2 31 1.19 13 39 80 AV4 0.1 21 0.54 13 39 80 AV2
-0.18 25 0.72 13 41 31 AV5
-0.14 20 0.49 13 41 31 AV4
-0.18 23 0.64 13 41 96 AV3 0.18 23 0.63 13 42 38 AV5 0.3 30 1.11 13 42 38 AV4
-0.28 37 2.16 13 42 38 AV3
-0.32 32 1.29 13 43 62 AV5
-0.04 24 0.70 13 43 64 AV4 0.01 25 0.73 13 43 69 AV5 0.18 20 0.47 13 43 80 AV5 0.18 20 0.51 13 43 80 AV4
-0.3 23 0.61 13 43 80 AV3
-0.27 27 0.90 13 43 80 AV2 0.17 28 0.97 13 43 81 AV6
-0.21 36 1.86 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 7 of 9 SG Row Column Location Inch
%TW Voltage 13 43 81 AV5
-0.04 23 0.63 13 43 81 AV4 0.06 31 1.23 13 43 81 AV2 0.23 33 1.38 13 43 91 AV4
-0.18 26 0.78 13 43 91 AV3 0.14 21 0.54 13 44 68 AV5 0.19 21 0.52 13 44 68 AV4 0.02 22 0.58 13 44 68 AV3 0.02 23 0.65 13 44 68 AV2
-0.1 24 0.66 13 44 68 AV1 0.18 24 0.66 13 44 71 AV2 0.24 22 0.59 13 44 76 AV3
-0.54 20 0.49 13 45 97 AV4
-0.16 25 0.76 13 46 24 AV5
-0.22 24 0.68 13 46 73 AV2
-0.14 20 0.49 13 48 25 AV2
-0.19 20 0.48 13 49 94 AV6 0.15 29 1.00 13 49 95 AV4 0.13 25 0.72 13 50 93 AV5 0.15 22 0.58 13 50 94 AV2 0.2 20 0.51 13 51 50 AV5
-0.18 23 0.65 13 51 55 AV5
-0.17 27 0.85 13 51 91 AV4 0.04 31 1.17 13 51 91 AV3 0.08 29 0.98 13 51 92 AV5
-0.18 22 0.58 13 51 92 AV2
-0.2 20 0.48 13 52 89 AV5 0.12 20 0.48 13 52 89 AV3
-0.14 24 0.68 13 52 89 AV2 0.14 26 0.79 13 53 57 AV3 0.15 22 0.59 13 53 72 AV4 0.15 23 0.61 13 53 88 AV5 0.16 25 0.76 13 53 89 AV5
-0.16 26 0.83 13 54 37 AV4
-0.16 22 0.57 13 54 37 AV3
-0.18 22 0.59 13 54 88 AV5
-0.2 25 0.72 13 54 88 AV4 0.12 20 0.48 14 24 6
AV1 0.02 22 0.56 14 24 116 AV1
-0.26 28 0.94 14 25 8
AV1
-0.29 30 1.14 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 8 of 9 SG Row Column Location Inch
%TW Voltage 14 25 115 AV6 0.01 26 0.79 14 26 7
AV1
-0.25 23 0.62 14 26 115 AV1 0.04 30 1.13 14 27 8
AV6
-0.18 20 0.49 14 27 8
AV1
-0.27 28 0.96 14 27 79 AV5 0.05 27 0.83 14 27 79 AV2 0.32 24 0.68 14 28 9
AV5
-0.02 30 1.15 14 28 9
AV2 0.32 28 0.90 14 30 72 AV2 0.09 21 0.55 14 32 12 AV5 0.02 25 0.76 14 32 12 AV4
-0.02 22 0.58 14 32 84 AV5
-0.3 24 0.67 14 32 84 AV2 0.2 25 0.73 14 33 12 AV5 0.3 35 1.70 14 33 12 AV2 0.17 25 0.72 14 34 108 AV4
-0.13 25 0.74 14 38 101 AV4 0.16 22 0.60 14 38 101 AV3 0.18 27 0.89 14 39 56 AV3 0.22 22 0.57 14 39 66 AV4
-0.2 23 0.61 14 39 66 AV3 0.16 30 1.13 14 39 66 AV2
-0.24 28 0.91 14 39 68 AV6
-0.35 23 0.63 14 39 68 AV5 0.11 20 0.51 14 39 68 AV4 0.57 23 0.65 14 39 68 AV3 0.12 38 2.36 14 39 68 AV2 0.08 32 1.34 14 39 77 AV4
-0.06 23 0.62 14 39 77 AV3
-0.2 22 0.59 14 39 96 AV3 0.04 26 0.82 14 39 96 AV2 0.2 30 1.10 14 39 97 AV3 0.02 20 0.49 14 39 100 AV3 0.14 21 0.52 14 40 48 AV6
-0.24 30 1.11 14 40 48 AV5
-0.31 30 1.07 14 40 48 AV4
-0.27 24 0.70 14 40 48 AV3 0.02 23 0.61 14 40 48 AV1
-0.19 24 0.68 14 40 58 AV2
-0.21 20 0.51 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (AVB WEAR)
Page 9 of 9 SG Row Column Location Inch
%TW Voltage 14 40 78 AV5 0.13 24 0.67 14 40 78 AV4
-0.04 20 0.49 14 40 80 AV4
-0.2 28 0.92 14 40 80 AV3
-0.1 20 0.48 14 40 80 AV2 0.26 26 0.77 14 40 80 AV6 0.1 21 0.51 14 40 80 AV5 0.23 26 0.80 14 40 87 AV6 0.06 20 0.49 14 40 87 AV5 0.28 31 1.23 14 40 87 AV4 0.2 28 0.92 14 40 87 AV3
-0.02 28 0.97 14 42 21 AV3 0.22 32 1.36 14 42 30 AV5 0.15 22 0.58 14 42 30 AV4 0.19 31 1.18 14 42 30 AV3 0.17 31 1.25 14 42 30 AV2 0.17 32 1.27 14 43 53 AV6
-0.14 22 0.58 14 43 53 AV5
-0.27 27 0.89 14 43 53 AV4 0.18 25 0.76 14 43 53 AV4
-0.23 23 0.62 14 43 53 AV3 0.34 35 1.69 14 43 53 AV2
-0.16 21 0.52 14 47 43 AV3 0.19 23 0.61 14 50 28 AV6
-0.22 26 0.79 14 53 33 AV5 0.19 24 0.70 14 53 38 AV4
-0.16 22 0.58 14 53 38 AV3 0.04 21 0.53 14 55 83 AV6 0.1 24 0.70 LR-N21-0075 MARCH 2020 SERVICE INDUCED INDICATIONS (FOREIGN OBJECT WEAR)
Page 1 of 1 SG Row Column Location Axial Length (inches)
Circumferential Extent (Degrees)
%TW
+Point Voltage 14 57 54 FBH +0.59 0.32 98.3 100 5.38 14 58 54 FBH +0.57 0.38 94.9 100 4.81 14 58 55 FBH +0.54 0.40 94.9 100 5.11 14 59 55 FBH +0.62 0.24 73.3 73 0.96 LR-N21-0075
SUMMARY
OF CONDITION MONITORING Page 1 of 1 Degradation Mechanism Max Depth
%TW March 2020 CM Limit 1
%TW March 2020 Projected 2 Depth %TW From 1R25 to 1R27 AVB Wear 39 59 Note 3 TSP Wear 12 62 46 FBP Wear 9
61 38 Loose Part Wear 100 Note 4 N/A 4 Note 1 - Conservative limit based on eddy current technique and flaw geometry/model.
Note 2 - Conservative deterministic projection provided by Operational Assessment from prior inspection outage (1R25) assuming 2 cycles of plant operation. Operational Assessment for AVB wear is a Probabilistic methodology.
Note 3 - AVB Wear Full Bundle Probabilistic model for 2 cycles of operation (starting from 1R25) provides probability of survival (POS) of 0.998, 0.999, 0.998, and 0.999, respectively for SGs 11 to 14. Meaning the probability of burst (POB) was projected to be 0.2% or less (i.e. - POB = (1 - POS) x 100), which is well below the requirement of 5%.
Note 4 - In-situ Screening / Testing performed as discussed in item 6.9.1.10.g of Reference 3 and as supplemented by items 3, 4, and 5 of Reference 4.