ML23068A107

End of Cycle 21 Steam Generator Tube Inspection Report Supplement

ML23068A107
Person / Time
Site:	Millstone
Issue date:	03/08/2023
From:	O'Connor M Dominion Energy Nuclear Connecticut
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
23-051
Download: ML23068A107 (1)

Text

Dom inion Energy Nuclear Connecticut, Inc.

M ill stone Power Station MARO 8 2023 Dominion 3 14 Rope Ferry Road, Wate rfo rd, CT 06385 Dominion Energy.com

_.:_; Energy U.S. Nuclear Regulatory Commission Serial No.23-051 Attention: Document Control Desk NSSL/TFO RO Washington, DC 20555 Docket No. 50-423 License No. NPF-49 DOMINION ENERGY NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION UNIT 3 END OF CYCLE 21 STEAM GENERATOR TUBE INSPECTION REPORT SUPPLEMENT In a letter dated October 27, 2022, Dominion Energy Nuclear Connecticut, Inc. submitted the End of Cycle 21 (EOC21) Steam Generator (SG) Tube Inspection report per Millstone Power Station Unit 3 Technical Specification (TS) Section 6.9.1.7. In a phone conversation on February 8, 2023, the NRC identified that additional information was required to .address TS 6.9.1.7 reporting requirement d. This reporting requirement addresses the location, orientation (if linear), and measured sizes (if available) of service induced indication.

The attachment to this letter contains the supplemental information for the EOC21 SG Tube Inspection report.

If you have any questions or require additional information, please contact Mr.

Dean E. Rowe at (860) 444-5292.

Sincerely, Michael J. O'Connor Site Vice President - Millstone

Attachment:

Millstone Power Station Unit 3, End of Cycle 21 Steam Generator Tube Inspection Report Supplement Commitments made in this letter: None

Serial No.23-051 Docket No. 50-423 Page 2 of 2 cc: U. S. Nuclear Regulatory Commission Region I 475 Allendale Road, Suite 102 King of Prussia, PA 19406-1415 R. V. Guzman Senior Project Manager - Millstone Power Station U. S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08-C 2 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station

Serial No.23-051 Docket No. 50-423 Attachment 1 Millstone Power Station Unit 3 End of Cycle 21 Steam Generator Tube Inspection Report Supplement MILLSTONE POWER STATION UNIT 3 DOMINION ENERGY NUCLEAR CONNECTICUT, INC. (DENC)

Serial No.23-051 Docket No. 50-423 Attachment, Page 1 of 22 End of Cycle 21 Steam Generator Tube Inspection Report Supplement In a letter dated October 27, 2022, Dominion Energy Nuclear Connecticut, Inc. submitted the End of Cycle 21 (EOC21) Steam Generator (SG) Tube Inspection report per Millstone Power Station Unit 3 Technical Specification (TS) Section 6.9.1.7. In phone conversation on February 8, 2023, the NRC identified, that additional information was required to address TS 6.9.1.7 reporting requirement d. This reporting requirement addresses the location, orientation (if linear), and measured sizes (if available) of service induced indication.

This attachment contains a revised Table 3: Summary of Non-AVB Wear Volumetric Degradation, and Table 4: Millstone 3 EOC21 Inspection Summary - AVB Wear Indications to those provided in the EOC21 SG Tube Inspection Report. These tables provide the supplemental information required.

As previously noted in the EOC21 SG Tube Inspection Report, a total of 88 Non-AVB volumetric wear indications were recorded during the examination with 57 of those recording wall losses of < 20%. The recorded wear indications are listed in Table 3.

There was a total of 736 AVB wear indications recorded in all SGs with 589 of those sized< 20% through wall. The recorded AVB Wear Indications are listed in Table 4.

Table 3: Summary of Non-AVB Wear Volumetric Degradation Max Axial Circ Depth Length Length SG Row Col Volts Location (%TW) (in) (in) Cause Steam Generator A SGA 2 17 0.16 05H -0.82 14 0.21 0.31 TSP Wear SGA 2 109 0.25 06 -0.59 23 0.32 0.29 TSP Wear SGA 3 112 0.29 06C -0.99 25 0.32 0.33 TSP Wear Foreign SGA 6 122 0.04 TSH +4.03 6 0.21 0.29 Object Wear Foreign SGA 7 3 0.22 TSC +0.13 25 0.32 0.39 Object Wear SGA 15 68 0.26 07C -0.75 23 0.32 0.33 TSP Wear SGA 15 74 0.44 07C -0.57 36 0.27 0.25 TSP Wear SGA 18 94 0.18 03H +0.27 18 0.21 0.27 TSP Wear SGA 20 97 0.11 08C -0.85 11 0.27 0.42 TSP Wear SGA 23 76 0.25 03C +0.32 22 0.16 0.42 TSP Wear Foreign SGA 24 7 0.22 04H +3.63 25 0.16 0.33 Object Wear Foreign SGA 24 11 0.1 TSH +0.08 14 0.32 0.25 Object Wear

Serial No.23-051 Docket No. 50-423 Attachment, Page 2 of 22 Max Axial Circ Depth Length Length SG Row Col Volts Location (%TW} (in} (in} Cause Foreign SGA 28 112 0.41 01 H +0.51 37 0.35 0.37 Object Wear Foreign SGA 29 109 0.12 TSC +0.08 17 0.21 0.29 Object Wear Foreign 0.21 01 H +0.53 13 0.45 0.29 Object Wear SGA 29 110 Foreign 0.14 TSC +0.13 18 0.27 0.29 Object Wear SGA 35 71 0.26 08C -0.93 21 0.24 0.33 TSP Wear SGA 36 76 0.1 01H +0.40 11 0.29 0.29 FB Wear Foreign SGA 43 103 0.09 TSC +0.72 12 0.27 0.31 Object Wear SGA 45 100 0.14 01 H 0.08 15 0.21 0.21 FB Wear Foreign SGA 47 24 0.27 01 C +0.91 28 0.27 0.35 Object Wear Foreign 0.2 01 C +0.93 23 0.27 0.33 Object Wear SGA 47 25 Foreign 0.3 01C+1.15 30 0.27 0.33 Object Wear SGA 58 47 0.09 TSC +0.53 14 0.21 0.33 Sled SGA 58 76 0.1 TSC +0.51 14 0.21 0.33 Sled Foreign SGA 59 60 0.21 08H -1.65 24 0.27 0.33 Object Wear Steam Generator B SGB 1 37 0.21 03C + 0.32 6 0.21 0.42 TSP Wear Foreign SGB 1 119 0.18 TSC + 4.03 21 0.27 0.37 Object Foreign 0.12 TSC + 3.95 16 0.32 0.37 Object SGB 1 120 Foreign 0.08 TSC +4.91 11 0.27 0.37 Object Foreign SGB 1 121 0.12 TSC + 6.69 16 0.53 0.29 Object SGB 15 99 0.3 03H - 0.51 8 0.32 0.37 TSP Wear SGB 16 36 0.16 05H -0.72 12 0.32 0.39 TSP Wear SGB 22 118 0.15 TSC + 0.77 19 0.27 0.37 Sled SGB 29 65 0.26 08C - 0.85 7 0.29 0.37 TSP Wear

Serial No.23-051 Docket No. 50-423 Attachment, Page 3 of 22 Max Axial Circ Depth Length Length SG Row Col Volts Location (%TW) (in) (in) Cause SGB 29 109 0.18 04H - 0.51 5 0.29 0.37 TSP Wear SGB 30 52 0.27 05H - 0.56 7 0.32 0.37 TSP Wear SGB 32 30 0.26 06H - 0.88 7 0.27 0.31 TSP Wear SGB 44 98 0.45 02H + 15.76 29 0.24 0.33 Fabrication Steam Generator C Foreign SGC 1 5 0.19 TSC +3.23 12 0.29 0.29 Object Wear SGC 3 3 0.2 04C +16.11 15 0.32 0.33 Fabrication Foreign SGC 8 61 0.23 TSH +0.45 25 0.27 0.33 Object Wear SGC 13 120 0.26 08C -0.8 18 0.27 0.33 TSP Wear SGC 17 52 0.59 04H -0.35 33 0.24 0.31 TSP Wear SGC 17 70 1.21 06H -0.56 45 0.27 0.29 TSP Wear SGC 20 72 0.19 02H +5.63 7 0.21 0.29 Fabrication SGC 35 78 0.23 08C-1.01 16 0.27 0.33 TSP Wear SGC 35 97 0.21 05H -.067 20 0.27 0.37 TSP Wear SGC 35 110 0.16 06C -1.07 12 0.27 0.37 TSP Wear SGC 36 13 0.13 TSC +0.53 17 0.32 0.25 Sled SGC 36 51 0.24 08C -0.77 17 0.21 0.33 TSP Wear SGC 36 75 0.17 08C -1.04 12 0.32 0.37 TSP Wear SGC 38 15 0.11 TSC +0.61 15 0.24 0.33 Sled SGC 44 102 0.07 TSC +0.53 10 0.21 0.33 Sled Foreign SGC 46 34 0.08 TSH +0.37 11 0.27 0.33 Object Wear SGC 46 52 0.19 05C -0.32 14 0.21 0.21 TSP Wear Foreign SGC 47 34 0.1 TSH +0.40 14 0.37 0.37 Object Wear SGC 47 61 0.14 06C -0.64 11 0.27 0.29 TSP Wear Foreign SGC 48 25 0.06 TSH +0.59 9 0.32 0.46 Object Wear SGC 48 88 0.46 07C -0.88 27 0.27 0.42 TSP Wear Foreign SGC 52 77 0.26 TSC +0.08 28 0.27 0.29 Object Wear Foreign SGC 52 79 0.31 TSC +0.08 31 0.32 0.39 Object Wear Foreign SGC 54 64 0.21 TSH +0.13 24 0.16 0.42 Object Wear

Serial No.23-051 Docket No. 50-423 Attachment, Page 4 of 22 Max Axial Circ Depth Length Length SG Row Col Volts Location (%TW) (in) (in) Cause Foreign SGC 55 68 0.15 TSH +0.72 19 0.21 0.33 Object Wear Foreign SGC 56 41 0.09 TSH +0.56 12 0.32 0.67 Object Wear SGC 56 65 0.25 06H +13.36 24 0.32 0.29 Fabrication Foreign SGC 56 69 0.25 TSH +0.11 27 0.21 0.33 Object Wear SGC 56 82 0.06 TSC +0.56 9 0.19 0.21 Sled SGC 57 44 0.07 TSH +0.59 10 0.27 0.37 Sled 0.06 TSC +0.59 9 0.16 0.37 Sled SGC 58 48 0.13 TSH +0.48 17 0.24 0.25 Sled 0.07 TSC +0.53 10 0.27 0.62 Sled SGC 58 49 0.11 TSH +0.45 15 0.27 0.42 Sled 0.11 TSC +0.59 15 0.32 0.33 Sled SGC 58 76 0.1 TSH +0.53 14 0.32 0.33 Sled SGC 59 55 0.06 TSC +0.48 10 0.27 0.29 Sled SGC 59 59 0.09 TSC +0.51 12 0.24 0.29 Sled SGC 59 68 0.08 TSH +0.56 11 0.16 0.37 Sled Steam Generator D SGD 17 24 0.68 07C -064 36 0.29 0.33 TSP Wear SGD 24 89 0.14 06C - 0.61 12 0.27 0.25 TSP Wear SGD 27 39 0.2 08C - 0.80 17 0.27 0.33 TSP Wear SGD 35 73 0.39 04H - 0.43 26 0.27 0.31 TSP Wear SGD 46 24 0.16 01H-0.11 14 0.29 0.27 FOB Wear Foreign SGD 46 99 0.21 01 H + 0.59 24 0.21 0.33 Object Foreign SGD 52 42 0.22 01H+0.56 25 0.32 0.27 Object Foreign SGD 52 91 0.33 01 H + 2.48 32 0.32 0.29 Object Foreign SGD 58 50 0.06 01C + 0.45 9 0.29 0.25 Object Foreign SGD 58 51 0.21 01C + 0.59 24 0.27 0.35 Object

Serial No.23-051 Docket No. 50-423 Attachment, Page 5 of 22 Table 4: Millstone 3 EOC21 Inspection Summary - AVB Wear Indications SG ROW COL AVB %TW VOLTS Steam Generator A - New AVB Wear Indications SGA 33 13 AV5 11 0.42 SGA 37 106 AV2 12 0.36 SGA 38 52 AV5 10 0.31 SGA 40 56 AV2 10 0.26 SGA 42 55 AV4 11 0.45 SGA 42 93 AV4 11 0.34 SGA 42 102 AV2 13 0.39 SGA 48 26 AV5 11 0.36 SGA 49 96 AVG 23 0.84 Steam Generator A - Repeat AVB Wear Indications SGA 12 121 AVG 7 0.19 SGA 18 72 AV1 10 0.29 SGA 21 118 AVG 8 0.24 SGA 22 78 AV1 12 0.39 SGA 22 78 AV5 17 0.59 SGA 22 78 AVG 14 0.46 SGA 24 116 AVG 12 0.38 SGA 26 44 AV2 10 0.31 SGA 26 44 AV5 14 0.48 SGA 26 115 AV1 27 1.20 SGA 27 8 AV1 9 0.26 SGA 27 8 AVG 8 0.23 SGA 27 9 AV3 9 0.28 SGA 27 115 AV1 19 0.51 SGA 28 36 AV5 11 0.35 SGA 28 113 AV5 12 0.27 SGA 28 115 AV1 33 1.49 SGA 29 40 AV2 11 0.34 SGA 29 67 AV1 8 0.23 SGA 29 67 AV2 16 0.56 SGA 29 67 AV5 8 0.22 SGA 29 79 AV5 12 0.38 SGA 29 114 AV2 9 0.28 SGA 29 114 AV5 9 0.28 SGA 30 9 AV5 30 1.46 SGA 30 10 AV5 12 0.40 SGA 30 11 AV5 8 0.24 SGA 30 40 AV2 10 0.31 SGA 30 113 AV5 24 0.95

Serial No.23-051 Docket No. 50-423 Attachment, Page 6 of 22 SG ROW COL AVB %TW VOLTS SGA 30 113 AV6 8 0.22 SGA 30 114 AV1 15 0.45 SGA 31 61 AV5 12 0.37 SGA 31 109 AV2 11 0.24 SGA 32 111 AV4 18 0.62 SGA 32 111 AV5 17 0.59 SGA 33 111 AV6 10 0.31 SGA 34 15 AV6 9 0.26 SGA 34 29 AV3 11 0.34 SGA 34 29 AV6 10 0.32 SGA 34 41 AV3 15 0.50 SGA 34 41 AV4 10 0.30 SGA 34 44 AV3 8 0.20 SGA 34 46 AV3 17 0.61 SGA 34 46 AV4 17 0.62 SGA 34 46 AV5 29 1.32 SGA 34 46 AV6 32 1.63 SGA 34 48 AV1 18 0.64 SGA 34 48 AV2 17 0.60 SGA 34 48 AV3 27 1.16 SGA 34 73 AV1 11 0.34 SGA 34 73 AV2 11 0.31 SGA 34 73 AV3 16 0.52 SGA 34 73 AV4 33 1.67 SGA 34 73 AV5 35 1.79 SGA 34 73 AV6 11 0.32 SGA 34 85 AV5 17 0.59 SGA 34 91 AV2 11 0.34 SGA 34 91 AV3 6 0.16 SGA 34 91 AV4 11 0.34 SGA 34 97 AV3 11 0.22 SGA 34 98 AV4 15 0.46 SGA 34 107 AV4 8 0.21 SGA 34 109 AV4 23 0.90 SGA 35 49 AV2 10 0.31 SGA 35 49 AV5 16 0.54 SGA 35 59 AV2 28 1.25 SGA 35 59 AV3 12 0.38 SGA 35 59 AV4 10 0.30 SGA 35 59 AV5 12 0.37 SGA 35 59 AV6 15 0.52 SGA 35 60 AV3 12 0.39

Serial No.23-051 Docket No. 50-423 Attachment, Page 7 of 22 SG ROW COL AVB %TW VOLTS SGA 35 60 AV4 30 1.40 SGA 35 60 AV5 26 1.13 SGA 35 60 AV6 10 0.30 SGA 35 61 AV2 14 0.45 SGA 35 61 AV4 11 0.35 SGA 35 65 AV2 10 0.30 SGA 35 65 AV3 14 0.48 SGA 35 65 AV4 16 0.57 SGA 35 65 AV5 18 0.65 SGA 35 71 AV3 16 0.54 SGA 35 71 AV4 28 1.26 SGA 35 71 AV5 15 0.50 SGA 35 71 AV6 9 0.27 SGA 35 77 AV1 9 0.25 SGA 35 77 AV2 15 0.49 SGA 35 77 AV3 20 0.69 SGA 35 77 AV4 18 0.62 SGA 35 77 AV5 12 0.36 SGA 35 80 AV3 5 0.15 SGA 35 90 AV2 9 0.27 SGA 35 90 AV3 12 0.36 SGA 35 100 AV3 10 0.21 SGA 35 108 AV2 14 0.44 SGA 35 108 AV3 15 0.49 SGA 35 108 AV4 19 0.68 SGA 35 108 AV6 10 0.31 SGA 37 34 AV1 9 0.27 SGA 37 45 AV2 35 1.88 SGA 37 45 AV3 25 1.06 SGA 37 45 AV4 18 0.64 SGA 37 45 AV5 16 0.57 SGA 37 56 AV3 13 0.42 SGA 37 56 AV4 18 0.64 SGA 37 69 AV5 20 0.77 SGA 37 69 AV6 23 0.91 SGA 37 72 AV3 15 0.50 SGA 37 89 AV3 11 0.27 SGA 37 90 AV2 13 0.39 SGA 37 90 AV3 24 0.94 SGA 37 90 AV4 17 0.56 SGA 37 90 AV5 12 0.39 SGA 37 91 AV3 18 0.62

Serial No.23-051 Docket No. 50-423 Attachment, Page 8 of 22 SG ROW COL AVB %TW VOLTS SGA 37 91 AV4 18 0.64 SGA 37 91 AV5 25 1.06 SGA 37 91 AVG 17 0.61 SGA 37 92 AV5 12 0.39 SGA 37 99 AV3 10 0.31 SGA 37 100 AV3 17 0.58 SGA 37 100 AV4 13 0.41 SGA 37 100 AV5 12 0.40 SGA 37 102 AV4 9 0.26 SGA 37 102 AV5 10 0.31 SGA 37 106 AV3 13 0.41 SGA 37 106 AV4 20 0.77 SGA 37 106 AV5 13 0.43 SGA 38 52 AV2 14 0.45 SGA 38 52 AV3 25 1.02 SGA 38 52 AV4 16 0.55 SGA 38 79 AVG 8 0.25 SGA 38 86 AV5 10 0.32 SGA 38 106 AV3 19 0.68 SGA 38 106 AV4 18 0.62 SGA 38 106 AV5 13 0.42 SGA 39 51 AV3 16 0.45 SGA 39 51 AV4 14 0.38 SGA 39 57 AV1 13 0.41 SGA 39 57 AV2 31 1.46 SGA 39 57 AV3 22 0.82 SGA 39 57 AV4 24 0.96 SGA 39 57 AV5 9 0.25 SGA 39 60 AV4 24 0.97 SGA 39 60 AV5 13 0.43 SGA 39 62 AV5 13 0.42 SGA 39 62 AVG 13 0.41 SGA 39 70 AV2 8 0.24 SGA 39 70 AV3 14 0.45 SGA 39 70 AV4 8 0.24 SGA 39 71 AV2 7 0.20 SGA 39 71 AV3 12 0.37 SGA 39 71 AV4 19 0.69 SGA 39 71 AV5 21 0.83 SGA 39 71 AVG 12 0.39 SGA 39 74 AV3 8 0.24 SGA 39 75 AV3 10 0.29

Serial No.23-051 Docket No. 50-423 Attachment, Page 9 of 22 SG ROW COL AVB %TW VOLTS SGA 39 75 AV4 9 0.26 SGA 39 75 AV5 13 0.44 SGA 39 75 AV6 11 0.34 SGA 39 78 AV3 12 0.40 SGA 40 45 AV3 12 0.39 SGA 40 45 AV4 28 1.29 SGA 40 45 AV5 13 0.44 SGA 40 58 AV2 17 0.56 SGA 40 58 AV3 17 0.54 SGA 40 58 AV5 9 0.23 SGA 40 64 AV4 14 0.46 SGA 40 67 AV2 10 0.31 SGA 40 67 AV3 13 0.41 SGA 40 71 AV2 17 0.59 SGA 40 71 AV3 22 0.87 SGA 40 71 AV4 26 1.12 SGA 40 84 AV6 11 0.34 SGA 40 86 AV2 9 0.26 SGA 40 94 AV5 20 0.53 SGA 40 100 AV3 12 0.34 SGA 40 102 AV4 7 0.22 SGA 41 61 AV3 19 0.70 SGA 41 61 AV4 24 0.97 SGA 41 72 AV2 15 0.49 SGA 41 72 AV3 12 0.38 SGA 41 74 AV4 10 0.32 SGA 41 74 AV5 9 0.26 SGA 41 87 AV4 16 0.53 SGA 41 91 AV3 8 0.24 SGA 41 95 AV3 7 0.21 SGA 41 100 AV3 10 0.32 SGA 41 101 AV4 8 0.25 SGA 41 101 AV5 9 0.28 SGA 41 102 AV4 37 2.01 SGA 41 102 AV5 17 0.55 SGA 41 104 AV6 12 0.40 SGA 41 105 AV6 11 0.36 SGA 42 20 AV6 8 0.24 SGA 42 33 AV3 20 0.75 SGA 42 33 AV4 13 0.42 SGA 42 37 AV2 14 0.45 SGA 42 37 AV3 9 0.27

Serial No.23-051 Docket No. 50-423 Attachment, Page 10 of 22 SG ROW COL AVB %TW VOLTS SGA 42 37 AVG 10 0.31 SGA 42 43 AV2 18 0.65 SGA 42 43 AV3 13 0.43 SGA 42 53 AV2 12 0.38 SGA 42 53 AV3 17 0.61 SGA 42 53 AV4 26 1.12 SGA 42 53 AV5 37 2.18 SGA 42 53 AVG 19 0.70 SGA 42 63 AV2 10 0.31 SGA 42 63 AV3 18 0.63 SGA 42 63 AV4 14 0.47 SGA 42 63 AV5 13 0.42 SGA 42 77 AV2 9 0.27 SGA 42 77 AV3 12 0.38 SGA 42 77 AV4 26 1.05 SGA 42 80 AV4 11 0.34 SGA 42 85 AV2 8 0.25 SGA 42 85 AV4 11 0.36 SGA 42 86 AV3 8 0.22 SGA 42 86 AV4 12 0.38 SGA 42 93 AV3 14 0.47 SGA 42 93 AV4 25 1.05 SGA 42 93 AV5 24 0.96 SGA 42 98 AV1 6 0.19 SGA 42 98 AV3 27 1.15 SGA 42 98 AV4 30 1.37 SGA 42 101 AV2 18 0.66 SGA 42 101 AV3 25 1.01 SGA 42 101 AV4 31 1.50 SGA 42 101 AV5 20 0.75 SGA 42 102 AV3 38 2.21 SGA 42 102 AV4 40 2.49 SGA 42 102 AV5 25 1.02 SGA 42 103 AV3 11 0.42 SGA 42 103 AV4 15 0.59 SGA 43 20 AVG 8 0.23 SGA 43 36 AV1 10 0.31 SGA 43 49 AV2 19 0.69 SGA 43 49 AV3 10 0.30 SGA 43 64 AV3 12 0.37 SGA 43 64 AV4 14 0.48 SGA 43 64 AV5 18 0.64

Serial No.23-051 Docket No. 50-423 Attachment, Page 11 of 22 SG ROW COL AVB %TW VOLTS SGA 43 76 AV4 8 0.22 SGA 43 80 AV3 15 0.51 SGA 43 80 AV4 19 0.69 SGA 43 80 AV5 10 0.33 SGA 43 80 AV6 12 0.37 SGA 43 85 AV3 7 0.21 SGA 43 87 AV2 17 0.61 SGA 43 87 AV4 21 0.77 SGA 43 87 AV5 23 0.90 SGA 43 89 AV3 12 0.35 SGA 43 95 AVG 10 0.29 SGA 43 96 AV5 8 0.23 SGA 43 98 AV4 15 0.52 SGA 43 98 AV5 10 0.32 SGA 43 99 AV4 17 0.58 SGA 43 99 AV5 6 0.17 SGA 43 101 AV3 7 0.20 SGA 43 101 AV4 19 0.67 SGA 43 101 AV5 13 0.41 SGA 43 102 AV4 21 0.78 SGA 43 102 AV5 16 0.57 SGA 43 103 AV5 11 0.35 SGA 44 64 AV2 29 1.29 SGA 44 64 AV3 20 0.72 SGA 44 74 AV4 19 0.70 SGA 44 74 AV5 28 1.29 SGA 44 74 AV6 21 0.78 SGA 44 75 AV3 16 0.68 SGA 44 96 AV2 12 0.37 SGA 44 96 AV4 16 0.53 SGA 44 96 AV5 7 0.21 SGA 44 98 AV1 10 0.31 SGA 44 98 AV2 23 0.88 SGA 44 98 AV4 15 0.48 SGA 45 45 AV3 9 0.28 SGA 45 68 AV1 7 0.20 SGA 45 71 AV1 9 0.26 SGA 45 71 AV2 12 0.38 SGA 45 96 AV5 11 0.33 SGA 45 98 AV4 21 0.78 SGA 45 98 AV5 G 0.19 SGA 45 98 AVG 10 0.31

Serial No.23-051 Docket No. 50-423 Attachment, Page 12 of 22 SG ROW COL AVB %TW VOLTS SGA 45 99 AV4 20 0.72 SGA 45 99 AV5 9 0.25 SGA 45 101 AVG 7 0.20 SGA 46 97 AV5 7 0.21 SGA 46 98 AV5 8 0.29 SGA 46 99 AV2 12 0.38 SGA 46 99 AV4 21 0.79 SGA 46 99 AV5 21 0.77 SGA 46 99 AVG 11 0.34 SGA 47 71 AV2 6 0.18 SGA 47 85 AV1 7 0.20 SGA 47 98 AV3 19 0.68 SGA 47 99 AVG 14 0.48 SGA 48 25 AV3 6 0.16 SGA 48 26 AV2 6 0.17 SGA 48 26 AVG 13 0.44 SGA 48 96 AVG 7 0.20 SGA 49 95 AV2 12 0.38 SGA 49 95 AV4 10 0.31 SGA 50 29 AV4 8 0.25 SGA 50 29 AV5 12 0.40 SGA 50 44 AV3 8 0.24 SGA 50 44 AV4 18 0.67 SGA 50 44 AV5 34 1.82 SGA 50 44 AVG 13 0.41 SGA 50 50 AV4 20 0.74 SGA 50 76 AV2 27 1.11 SGA 50 76 AV3 25 0.99 SGA 50 76 AV4 33 1.62 SGA 50 82 AV2 17 0.57 SGA 50 82 AV3 31 1.40 SGA 50 82 AV4 22 0.81 SGA 50 86 AV2 15 0.50 SGA 50 87 AV2 24 0.98 SGA 50 87 AV3 20 0.75 SGA 50 87 AV4 13 0.43 SGA 50 87 AV5 10 0.32 SGA 51 31 AV2 12 0.40 SGA 51 64 AV3 10 0.31 SGA 51 64 AV4 10 0.32 SGA 51 65 AV1 10 0.28 SGA 51 65 AV2 11 0.33

Serial No.23-051 Docket No. 50-423 Attachment, Page 13 of 22 SG ROW COL AVB %TW VOLTS SGA 51 65 AV3 12 0.36 SGA 51 65 AV4 13 0.40 SGA 51 65 AV5 23 0.86 SGA 51 65 AVG 15 0.46 SGA 51 66 AV2 9 0.29 SGA 51 66 AV3 8 0.23 SGA 51 79 AV3 6 0.18 SGA 52 66 AV4 27 1.17 SGA 52 90 AV2 10 0.33 SGA 52 90 AV3 13 0.42 SGA 52 90 AV4 11 0.36 SGA 53 81 AV1 11 0.33 SGA 53 81 AV3 29 1.38 SGA 53 81 AV5 8 0.25 SGA 54 35 AV4 12 0.37 SGA 54 35 AV5 19 0.68 SGA 54 35 AVG 18 0.63 SGA 54 49 AV2 14 0.45 SGA 54 49 AV3 12 0.38 SGA 56 41 AV2 11 0.35 SGA 58 54 AV1 9 0.26 SGA 59 64 AVG 7 0.19 Steam Generator B - New AVB Wear Indications SGB 35 103 AV4 13 0.43 Steam Generator B - Repeat AVB Wear Indications SGB 30 12 AV2 11 0.36 SGB 30 12 AV5 15 0.56 SGB 32 108 AV4 13 0.53 SGB 33 12 AV2 15 0.54 SGB 33 12 AV5 16 0.6 SGB 33 39 AV3 9 0.35 SGB 33 109 AV2 18 0.67 SGB 33 109 AV3 20 0.79 SGB 33 109 AVG 6 0.2 SGB 34 18 AV3 8 0.29 SGB 34 18 AV4 6 0.22 SGB 34 71 AV3 9 0.31 SGB 34 109 AV2 11 0.34 SGB 34 109 AV3 22 0.85 SGB 34 109 AV5 16 0.54 SGB 34 109 AVG 9 0.28 SGB 34 110 AV3 9 0.29

Serial No.23-051 Docket No. 50-423 Attachment, Page 14 of 22 SG ROW COL AVB %TW VOLTS SGB 35 103 AV6 11 0.37 SGB 35 106 AV3 7 0.27 SGB 35 106 AV4 15 0.65 SGB 35 106 AV6 9 0.35 SGB 36 22 AV6 11 0.37 SGB 36 39 AV2 7 0.25 SGB 36 39 AV3 10 0.38 SGB 36 39 AV4 10 0.4 SGB 36 39 AV5 18 0.81 SGB 36 39 AV6 14 0.58 SGB 36 67 AV6 8 0.28 SGB 37 100 AV4 11 0.44 SGB 37 103 AV2 12 0.43 SGB 37 104 AV3 13 0.46 SGB 37 104 AV4 9 0.32 SGB 38 104 AV3 14 0.48 SGB 38 104 AV4 27 1.26 SGB 38 104 AV5 14 0.49 SGB 39 30 AV2 11 0.41 SGB 39 30 AV3 10 0.38 SGB 39 30 AV4 11 0.42 SGB 39 30 AV5 9 0.35 SGB 39 96 AV3 13 0.46 SGB 40 23 AV2 13 0.49 SGB 40 23 AV3 11 0.37 SGB 40 23 AV4 15 0.56 SGB 40 23 AV5 15 0.53 SGB 40 24 AV3 16 0.63 SGB 40 24 AV4 18 0.72 SGB 40 24 AV5 11 0.39 SGB 41 34 AV2 13 0.45 SGB 41 34 AV3 14 0.5 SGB 41 34 AV4 33 1.73 SGB 41 34 AV5 32 1.65 SGB 41 34 AV6 11 0.36 SGB 41 50 AV3 17 0.64 SGB 41 50 AV4 24 1.02 SGB 41 69 AV3 8 0.32 SGB 41 69 AV4 18 0.78 SGB 41 69 AV5 31 1.72 SGB 41 77 AV3 15 0.57 SGB 41 77 AV4 13 0.5

Serial No.23-051 Docket No. 50-423 Attachment, Page 15 of 22 SG ROW COL AVB %TW VOLTS SGB 41 77 AV5 18 0.75 SGB 42 19 AV1 11 0.36 SGB 42 21 AV2 15 0.62 SGB 42 21 AV3 11 0.42 SGB 42 21 AV4 19 0.86 SGB 42 21 AV5 26 1.3 SGB 42 21 AVG 13 0.54 SGB 42 33 AV2 11 0.35 SGB 42 33 AV5 14 0.51 SGB 42 96 AV2 17 0.76 SGB 42 96 AV3 11 0.44 SGB 42 96 AV4 8 0.33 SGB 42 96 AV5 9 0.36 SGB 42 98 AV1 9 0.3 SGB 42 98 AV2 32 1.63 SGB 42 98 AV3 39 2.43 SGB 42 98 AV4 18 0.72 SGB 42 98 AV5 9 0.3 SGB 43 86 AV4 10 0.33 SGB 43 100 AV3 25 1.2 SGB 43 100 AV4 28 1.36 SGB 43 100 AVG 9 0.32 SGB 45 22 AVG 9 0.36 SGB 46 99 AV4 10 0.4 SGB 48 25 AVG 7 0.22 SGB 49 27 AV1 10 0.38 SGB 49 27 AV2 11 0.4 SGB 49 27 AV5 10 0.39 SGB 50 29 AV2 18 0.7 SGB 50 29 AVG 13 0.47 SGB 50 72 AV3 12 0.45 SGB 50 88 AV2 18 0.83 SGB 50 88 AV3 20 0.92 SGB 50 88 AV4 22 1.07 SGB 50 88 AV5 10 0.39 SGB 50 88 AVG 9 0.34 SGB 51 91 AV4 16 0.74 SGB 51 91 AV5 13 0.58 SGB 51 91 AVG 8 0.32 SGB 54 35 AV2 12 0.41 SGB 54 35 AV4 9 0.28 SGB 54 35 AV5 14 0.49

Serial No.23-051 Docket No. 50-423 Attachment, Page 16 of 22 SG ROW COL AVB %TW VOLTS SGB 54 35 AVG 10 0.34 SGB 54 36 AV5 34 1.78 SGB 54 36 AVG 15 0.53 SGB 54 37 AV1 13 0.44 SGB 54 45 AV2 10 0.32 SGB 55 84 AVG 11 0.37 SGB 56 41 AV3 11 0.35 SGB 56 42 AVG 12 0.4 SGB 56 71 AV2 10 0.33 SGB 56 81 AV1 9 0.33 SGB 57 70 AV2 8 0.26 SGB 58 74 AV4 9 0.33 SGB 58 75 AV5 19 0.8 SGB 59 65 AV2 12 0.48 Steam Generator C - New AVB Wear Indications SGC 42 23 AV2 17 0.58 SGC 54 40 AV2 16 0.56 Steam Generator C - Repeat AVB Wear Indications SGC 15 66 AV1 12 0.34 SGC 25 8 AV1 12 0.32 SGC 25 115 AV1 11 0.34 SGC 25 116 AVG 21 0.73 SGC 27 44 AV2 12 0.32 SGC 34 14 AV2 12 0.33 SGC 34 14 AV5 12 0.36 SGC 36 15 AV5 12 0.36 SGC 36 15 AVG 10 0.26 SGC 37 15 AV2 24 0.89 SGC 37 15 AV3 12 0.33 SGC 37 15 AV4 15 0.45 SGC 37 15 AV5 28 1.09 SGC 37 15 AVG 17 0.51 SGC 37 88 AV3 12 0.34 SGC 39 17 AV2 21 0.72 SGC 39 17 AV3 14 0.41 SGC 39 17 AV4 23 0.83 SGC 39 17 AV5 21 0.69 SGC 39 17 AVG 12 0.32 SGC 39 79 AV3 19 0.66 SGC 39 107 AVG 10 0.27 SGC 41 42 AV3 27 1.12 SGC 41 42 AV4 16 0.51

Serial No.23-051 Docket No. 50-423 Attachment, Page 17 of 22 SG ROW COL AVB %TW VOLTS SGC 41 54 AV1 13 0.42 SGC 41 54 AV3 20 0.70 SGC 41 54 AV4 17 0.53 SGC 41 54 AV5 25 0.93 SGC 41 62 AV2 26 0.99 SGC 41 62 AV3 32 1.43 SGC 41 62 AV4 34 1.58 SGC 41 62 AV5 34 1.64 SGC 41 62 AV6 18 0.56 SGC 41 65 AV4 20 0.63 SGC 41 65 AV5 24 0.83 SGC 41 105 AV6 9 0.25 SGC 42 20 AV2 17 0.55 SGC 42 20 AV3 24 0.93 SGC 42 20 AV4 26 1.09 SGC 42 20 AV5 25 0.97 SGC 42 20 AV6 19 0.66 SGC 42 23 AV2 17 0.58 SGC 42 23 AV3 21 0.77 SGC 42 23 AV4 31 1.45 SGC 42 23 AV5 28 1.22 SGC 42 103 AV3 10 0.30 SGC 45 57 AV2 18 0.57 SGC 45 100 AV5 8 0.24 SGC 45 100 AV6 10 0.28 SGC 46 33 AV6 9 0.26 SGC 46 97 AV1 9 0.32 SGC 46 97 AV3 9 0.31 SGC 47 99 AV6 14 0.52 SGC 48 26 AV4 10 0.30 SGC 48 98 AV3 10 0.28 SGC 48 98 AV4 10 0.26 SGC 48 98 AV6 10 0.27 SGC 49 96 AV5 25 0.91 SGC 49 96 AV6 27 1.07 SGC 50 28 AV2 11 0.34 SGC 50 28 AV5 19 0.71 SGC 50 93 AV5 14 0.54 SGC 50 93 AV6 27 1.29 SGC 50 95 AV6 11 0.31 SGC 51 92 AV6 10 0.36 SGC 54 35 AV5 12 0.40

Serial No.23-051 Docket No. 50-423 Attachment, Page 18 of 22 SG ROW COL AVB %TW VOLTS SGC 54 36 AV4 16 0.50 SGC 54 36 AV5 13 0.40 SGC 54 40 AV2 16 0.56 SGC 54 86 AV1 9 0.27 SGC 56 41 AV2 8 0.23 SGC 56 41 AV4 17 0.59 SGC 56

• 41 AV5 25 1.03 SGC 56 41 AVG 15 0.49 SGC 56 44 AV4 7 0.19 SGC 57 69 AV1 16 0.47 SGC 58 49 AV5 9 0.25 There Were No New AVB Wear Indications Identified in Steam Generator D Steam Generator D - Repeat AVB Wear Indications SGD 9 121 AVG 11 0.31 SGD 24 117 AV1 21 0.76 SGD 25 93 AV5 12 0.36 SGD 25 115 AV1 9 0.29 SGD 26 8 AVG 14 0.41 SGD 26 115 AV1 14 0.48 SGD 26 116 AV1 8 0.21 SGD 27 115 AV1 16 0.52 SGD 27 115 AVG 13 0.38 SGD 28 8 AV1 12 0.37 SGD 28 8 AVG 13 0.43 SGD 28 114 AV2 28 1.20 SGD 28 114 AV5 8 0.23 SGD 29 113 AV2 15 0.49 SGD 29 113 AV5 15 0.46 SGD 30 113 AV2 10 0.31 SGD 30 114 AV1 12 0.34 SGD 30 114 AVG 21 0.73 SGD 31 99 AV2 10 0.30 SGD 31 99 AV5 11 0.32 SGD 31 99 AVG 10 0.28 SGD 32 112 AV5 9 0.24 SGD 33 86 AV3 10 0.31 SGD 33 86 AV4 14 0.47 SGD 33 109 AV2 11 0.32 SGD 33 109 AV5 17 0.55 SGD 34 109 AV2 8 0.23 SGD 35 99 AV2 14 0.44

Serial No.23-051 Docket No. 50-423 Attachment, Page 19 of 22 SG ROW COL AVB %TW VOLTS SGD 35 99 AV5 15 0.49 SGD 35 102 AV5 12 0.38 SGD 35 103 AV5 15 0.46 SGD 35 107 AV4 9 0.27 SGD 35 108 AV3 16 0.49 SGD 35 108 AV4 11 0.33 SGD 35 109 AV4 16 0.50 SGD 35 109 AV5 8 0.22 SGD 36 34 AV2 6 0.15 SGD 36 82 AV3 10 0.31 SGD 36 88 AV2 8 0.21 SGD 36 88 AV3 8 0.21 SGD 36 88 AV5 9 0.26 SGD 36 97 AV2 14 0.43 SGD 36 108 AV2 7 0.19 SGD 37 93 AV2 11 0.32 SGD 37 93 AV3 17 0.54 SGD 37 101 AV2 19 0.70 SGD 37 101 AV3 14 0.47 SGD 37 101 AV4 14 0.43 SGD 37 103 AV2 13 0.39 SGD 37 103 AV3 13 0.41 SGD 37 103 AV5 14 0.46 SGD 37 103 AVG 12 0.38 SGD 37 106 AV1 11 0.33 SGD 37 106 AV3 20 0.71 SGD 37 106 AV4 33 1.59 SGD 37 106 AV5 23 0.90 SGD 37 106 AVG 14 0.45 SGD 38 21 AV5 15 0.44 SGD 38 21 AVG 10 0.32 SGD 38 95 AV5 9 0.25 SGD 38 98 AV2 10 0.28 SGD 38 98 AV4 14 0.41 SGD 40 32 AV2 10 0.29 SGD 40 99 AV2 13 0.40 SGD 40 99 AV3 11 0.30 SGD 40 99 AV4 26 1.01 SGD 40 99 AV5 32 1.50 SGD 40 100 AV4 12 0.36 SGD 40 100 AV5 17 0.55 SGD 40 100 AVG 12 0.35

Serial No.23-051 Docket No. 50-423 Attachment, Page 20 of 22 SG ROW COL AVB %TW VOLTS SGD 40 101 AV3 12 0.39 SGD 40 101 AV4 11 0.34 SGD 40 101 AV5 11 0.34 SGD 40 101 AVG 9 0.26 SGD 40 102 AV2 9 0.26 SGD 40 102 AV3 13 0.43 SGD 40 102 AV4 24 0.90 SGD 40 102 AV5 16 0.51 SGD 40 102 AVG 10 0.27 SGD 40 103 AV1 10 0.27 SGD 40 103 AV2 21 0.75 SGD 40 103 AV3 27 1.07 SGD 40 103 AV4 36 1.91 SGD 40 103 AV5 29 1.24 SGD 40 103 AVG 13 0.41 SGD 41 26 AV2 13 0.39 SGD 41 26 AV5 31 1.48 SGD 41 26 AVG 32 1.54 SGD 41 29 AV4 12 0.36 SGD 41 29 AVG 10 0.29 SGD 41 30 AV2 11 0.29 SGD 41 30 AV3 13 0.42 SGD 41 30 AV4 19 0.65 SGD 41 30 AV5 12 0.38 SGD 41 31 AV2 13 0.42 SGD 41 39 AV2 14 0.45 SGD 41 39 AV3 22 0.81 SGD 41 39 AV4 22 0.85 SGD 41 39 AV5 28 1.20 SGD 41 39 AVG 9 0.24 SGD 41 78 AV2 9 0.26 SGD 41 78 AV3 23 0.85 SGD 41 78 AV4 21 0.73 SGD 41 78 AV5 11 0.32 SGD 41 87 AV3 6 0.16 SGD 41 90 AV1 12 0.36 SGD 41 90 AV3 10 0.28 SGD 42 19 AV5 15 0.47 SGD 42 103 AV2 14 0.41 SGD 43 20 AVG 11 0.31 SGD 43 25 AV5 12 0.38 SGD 43 33 AV3 9 0.26

Serial No.23-051 Docket No. 50-423 Attachment, Page 21 of 22 SG ROW COL AVB %TW VOLTS SGD 43 95 AV4 11 0.31 SGD 43 95 AV5 18 0.60 SGD 43 100 AV4 18 0.45 SGD 43 100 AV5 6 0.12 SGD 43 100 AVG 16 0.39 SGD 43 102 AV5 13 0.45 SGD 43 102 AVG 12 0.40 SGD 44 21 AV1 10 0.27 SGD 45 22 AVG 8 0.23 SGD 45 41 AV3 15 0.47 SGD 45 41 AV4 9 0.24 SGD 45 47 AVG 12 0.37 SGD 45 92 AV2 11 0.35 SGD 45 96 AV2 11 0.24 SGD 45 96 AV3 11 0.26 SGD 45 96 AV5 9 0.20 SGD 47 24 AV1 9 0.24 SGD 47 96 AV5 12 0.27 SGD 47 98 AV5 9 0.27 SGD 48 25 AVG 11 0.34 SGD 48 94 AVG 13 0.30 SGD 48 96 AV5 17 0.54 SGD 49 62 AV1 23 0.92 SGD 49 62 AV2 22 0.87 SGD 49 62 AV3 31 1.52 SGD 49 62 AV4 18 0.67 SGD 49 66 AV1 14 0.45 SGD 49 66 AV2 33 1.60 SGD 49 66 AV3 18 0.59 SGD 49 67 AV2 25 0.95 SGD 49 67 AV3 22 0.82 SGD 49 67 AV4 10 0.27 SGD 49 69 AV2 11 0.33 SGD 49 70 AV2 14 0.45 SGD 49 86 AV3 11 0.35 SGD 49 95 AV2 20 0.71 SGD 49 95 AV3 20 0.73 SGD 49 95 AV4 20 0.67 SGD 50 28 AVG 11 0.30 SGD 50 80 AV2 11 0.34 SGD 50 80 AV3 9 0.29 SGD 50 83 AV1 14 0.44

Serial No.23-051 Docket No. 50-423 Attachment, Page 22 of 22 SG ROW COL AVB %TW VOLTS SGD 50 83 AV2 17 0.54 SGD 50 83 AV3 8 0.21 SGD 50 90 AV1 9 0.24 SGD 51 87 AV5 12 0.35 SGD 51 89 AV6 14 0.33 SGD 52 33 AV5 6 0.16 SGD 52 67 AV3 10 0.27 SGD 52 67 AV4 22 0.81 SGD 52 67 AV5 14 0.44 SGD 52 69 AV2 10 0.27 SGD 52 87 AV5 16 0.41 SGD 52 87 AV6 7 0.14 SGD 52 88 AV1 12 0.38 SGD 52 88 AV2 18 0.58 SGD 52 88 AV3 11 0.34 SGD 52 88 AV4 14 0.44 SGD 53 33 AV6 11 0.34 SGD 53 34 AV6 9 0.26 SGD 53 35 AV4 12 0.36 SGD 53 35 AV5 15 0.49 SGD 53 35 AV6 14 0.47 SGD 53 36 AVG 11 0.35 SGD 53 70 AV2 11 0.32 SGD 54 49 AV2 19 0.63 SGD 54 49 AV3 23 0.83 SGD 54 49 AV4 11 0.34 SGD 54 87 AV1 7 0.18 SGD 55 40 AVG 18 0.58 SGD 55 75 AVG 19 0.67 SGD 55 84 AV5 24 0.91 SGD 55 84 AV6 10 0.28 SGD 56 43 AV1 10 0.29 SGD 58 59 AV1 10 0.28