ML17209A554

Watts Bar, Unit 1 - Cycle 14 Steam Generator Tube Inspection Report

ML17209A554
Person / Time
Site:	Watts Bar
Issue date:	07/28/2017
From:	Simmons P Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation, NRC/RGN-II
References
SC-SGMP-17-20, Rev. 0
Download: ML17209A554 (22)

Text

Tennessee Valley Authority, Post Office Box 2000, Spring City, Tennessee 37381 July 28,2017 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NPF-90 NRC Docket No. 50-390

Subject:

Watts Bar Nuclear Plant (WBN) Unit 1 - Cycle 14 Steam Generator Tube lnspection Report ln accordance with the requirements of WBN Technical Specification (TS) 5.9.9, "Steam Generator Tube lnspection Report," the Enclosure provides the 180 Day Steam Generator lnspection Report for Unit 1 Cycle 14. This report is required to be submitted within 180 days after the initial entry into MODE 4 following the completion of an inspection performed in accordance with TS 5.7.2.12, "Steam Generator (SG) Program." The report provides the complete results of the tube inspections.

There are no regulatory commitments in concerning this matter to Kasey Decker, Respectfully, this submittal.

Please direct any questions WBN Site Licensing, at 423-365-3173.

Pau! Simmons Site Vice President Watts Bar Nuclear Plant

Enclosure:

Watts Bar U1R14 180 Day Steam GeneratorTube Inspection Report cc: See Page 2 U.S. Nuclear Regulatory Commission Page 2 July 28,2017 Enclosures cc (Enclosures):

NRC Regional Administrator - Region ll NRC Project Manager - Watts Bar Nuclear Plant, Unit 1 NRC Senior Resident lnspector - Watts Bar Nuclear Plant, Unit 1 Enclosure Watts Bar UlR14 180 Day Steam Generator Tube lnspection Report WTSTTNGHOUSE NON-PnoprueTARY CIess 3 SCr-SGMP-17-20 Revision 0 June 2017 Watts Bar U1R14 180 Day Steam Generator TUbe Inspection Report WESTINGHOUSE NON-PROPRIETARY CLASS 3 SCr-SGMP-17-20 Revision 0 Waffs Bar U1R14 180 Day Steam Generator Tube Inspection Report Prepared for: Tennessee Valley Authority Author's Name: William R. LaMantia SG Management Programs Verifier's Name: Jesse S. Baron SG Management Programs Manager's Name: David P. Lytle, Manager SG Management Programs Revierverts Name: Jercmyl[/.

Mayo TYA SGPrograrnManager Reviewer'sNnmel Tarnmy C. $ears TYA Watts Bar SG Progmm O$mer Rtvlewgr'r Nnnrtr DaniclP, Folsom TYA NDHLevel III Signature lDate*E I ec tron i caII v A p pro ved For Pages All Signature lDate*EI ectron i c aII v A p pro ved For Pages All Signature I Date*Electronicallv A o oroved For Pages All Signnture I Date Date For Fageo For Pages Sign*ffir*

/-"&\* Electronically Approved Records are Authcnticeted in the Elcafronic Document Menagcmeat System 02017 Westinghouse Electric Company LtC Alt Rights Reserved Signature

/SG-SGMP-17-20 Revision 0 June 2017 Page 2 of 19 Record of Revisions Revision Date Description 0a June 2017 Preliminary draft for Tennessee Valley Authority review and corrment.0 See EMDS Original Issue SG-SGMP-17-20 Revision 0 June 2017 Page 3 of 19 Table of Contents 2.0 180 Day Steam Generator Tube lnspection Report ..........6 The Scope of the Inspections Performed on Each SG.............

...............6 Active Degradation Mechanisms Found......

........................6 Nondestructive Examination (NDE) Techniques Used for Each Degradation Mechanism..........6 Location, Orientation (if Linear), and Measured Sizes (if Available) of Service lnduced Indications.

..................7 Number of Tubes Plugged During the Inspection Outage for Each Active Degradation Mechanism

................18 Total Number and Percentage of Tubes Plugged to Date .....................

19 The Results of Condition Monitoring, Including the Results of Tube Pulls and In-Situ Testinglg The Effective Plugging Percentage for All Plugging in Each SG..............

..............

19 List of Tables and Figures Figure l-l: Tube Support Arrangement for Watts Bar Unit I Model 68AXP Replacement Steam Generators

.5 Table 2-l: Watts Bar UlRl4 Steam Generator Eddy Current Inspection Scope.........

.....................6 Table2-2:

Number of lndications Detected for Each Degradation Mechanism

............6 Table 2-3: NDE Techniques for Each Existing or Potential Degradation Mechanism.............

........7 Table 24: Watts Bar UlRl4 U-bend Support Stnrcture Wear Indications - All SGs ............

..........7 Table 2-5: Watts Bar UlR14 Horizontal Tube Support Grid Wear Indications - SG 1...........

.........9 Table2-9:

Number of Tubes Plugged for Each Degradation Mechanism

...................18 a.b.c.d.e.f.o D.h.SG-SGMP-17-20 Revision 0 Jnne 2017 Page 4 of 19

1.0 Introduction

Inspections of the replacement steam generators (SGs) were perforrned during the Watts Bar Unit 1 (WBNI) spring 2017 refueling outage designated as (UlRl4). These inspections included eddy current test.g of the SG tubing as well as primary and secondary side cleanings and visual inspections.

This report documents the "Watts Bar UlRl4 180-Day Steam Generator Tube lnspection Report" as required by the WBN1 Technical Specifications.

The original steam generators at WBNI were replaced in 2006 with Westinghouse Model 68AXP SGs which have thermally treated Alloy 690 tubing. The UlRl4 inspection was the third in-service inspection of the replacement SGs. Prior to the UlRl4 inspection, the replacement SGs had operated for seven (7)fuel cycles since replacement.

The replacement SGs had operated for tbree (3) fuel cycles since the previous inspection at UlRl l. Figure l-l below provides the arrangement and location designation of the tube support structures for the WBN1 SGs.AXIAL fLott ilL.-,- C0LD SIDI);rr RECIRCULATING TNTRANCT CROSS TLOW HOT SIDE RECIRCULATINO ENTRANCT CROSS TLOW Figure 1-1: Tube Support Arrangement for Watts Bar Unit I Model68AXP Replacement Steam Generators Notes: VS : Vertical Strap DS : Diagonal Strap HTS/CTS : Hot/Cold Tubesheet (designates top of tubesheet)

HTE/CTE : Hot/Cold Tube End Horizontal supports are a lattice grid design SG-SGMP-17-20 Revision 0 Jtrne 2017 Page 5 of 19 2.0 180 Day Steam Generator Tube Inspection Report In accordance with WBNI Technical Specification Section 5.7.2.12, "Steam Generator Program", and Technical Specification Section 5.9.9, "Steam Generator Tube Inspection Report", this report documents the scope and results of the UlR14 SG inspections.

There are eight specific reporting requirements associated with the Technical Specification.

Each lettered reporting requirement listed below is followed with the associated infonnation based on the inspections performed during U1R14.a. The Scope of the Inspections Performed on Each SG The UlRl4 outage included a combination of bobbin and array coil inspections of 100% of the full length in all in-service tubes except for tubes in Rows I through 4. Tube Rows I through 4 were inspected to the frst support with the combination bobbin and array coil from both the hot leg tube end (HTE) and the cold leg tube end (CTE). The remainder of the tube length in Rows I through 4 were inspected with a singular bobbin probe due to dimensional clearance restrictions in the U-bend region. As a result, the inspection included all tubes with prior indications of degradation and all tubes not inspected during the previous SG in-service inspection.

The table below summarizes the number and type of eddy current examinations performed during UlR14.Table 2-1: Watts Bar U1R14 Steam Generator Eddy Current Inspection Scope Eddy Current Exam TVpe sGl sG2 sG3 sG4 Total 0.610 tIL Bobbin & Array VS3-HTE 5,125 5,123 5,121 5,114 20,483 0.610 CL Bobbin & Array VS3-CTE 5,125 5,123 5,121 5,114 20,483 0.590 HLICL Bobbin (U-bend Region)t27 t27 t27 t27 s08 In addition to the eddy current inspections, visual inspections were also performed on both the primary and secondary sides. Primary side visual inspections included all previously installed tube plugs, the channel head bowl cladding, and the divider plate. Secondary side visual inspections were performed at the top of the tubesheet for the detection of foreign objects, assessment of hard deposit buildup in the tube bundle interior 'kidney region' and for determining the effectiveness of the tubesheet cleaning performed in all four SGs.b. Active Degradation Mechanisms Found Volumetric wear was the only degradation mechanism detected during the UlRl4 inspection.

All of the wear indications detected were located at either U-bend or horizontal tube support structures.

Table 2-2 below shows the number of indications reported during the UlR14 inspection.

Table2-22 Number of Indications Detected for Each Degradation Mechanism Degradation Mechanism scl1 sG12 sG13 SGl4 Total U-bend Support Stmcnre Wear l3 lt 23 t2 59 Horizontal Tube Support Grid Wear 74 139 83 t23 419 c. Nondestructive Examination (NDE) Techniques Used for Each Degradation Mechanism Table 2-3 below provides the NDE techniques that were used for the detection of each degradation mechanism that was considered as existing or potential for the UlRl4 inspection.

SG-SGMP-17-20 Revision 0 Jtrne 2017 Page 6 of 19 Table 2-3: I\DE Techniques for Each Existing or Potential Degradation Mechanism Degradation Mechanism Detection Technique EPRI ETSS U-Bend Support Stmcture Wear Bobbin Array Array Array Array 96004.1, Revision l3 I 1956. l, Revision 2 11956.2, Revision 2 I 1956.3, Revision 2 11956.4. Revision2 Horizontal Tube Support Grid Wear Bobbin Array Array Array Array 96004.1, Revision l3 I 1956.1, Revision 2 11956.2, Revision2 I1956.3, Revision2 11956.4. Revision2 Foreign Object Wear Bobbin Array Array Array Array 27091.2, Revision 2 I 1956.1, Revision 2 11956.2, Revision 2 I1956.3, Revision 2 11956.4. Revision2 Tube-to-Tube Wear Bobbin 96010.1, RevisionT d. Location, Orientation (if Linear), and Measured Sizes (if Available) of Service Induced Indications Table 2-4 through 2-8 below provides a listing of all service-induced indications reported during the UlRl4 inspection including the estimated depths from the bobbin coil.Table 24: lVatts Bar U1R14 U-bend Support Structure Wear fndications - All SGs SG Row Col Locn Inchl Ind YuTW Characterization Resolution I 53 74 VS4 l. t5 PCT l5 U-bend Support Stnrcnre Wear Remain In-Service I 58 47 VS3 1.29 PCT l6 U-bend Support Structure Wear Remain In-Service I 58 47 VS3-0.96 PCT l6 U-bend Support Structure Wear Remain In-Service I 66 65 V54 0.86 PCT r9 U-bend Support Structure Wear Remain In-Service I 77 56 VS3-0.9r PCT l8 U-bend Support Structure Wear Remain In-Service I 77 82 VS3 t.t2 PCT t7 U-bend Support Stnrcture Wear Remain In-Senrice I 82 83 VS4 I.0r PCT t8 U-bend Support Structure Wear Remain In-Service I 95 58 VS2-0.61 PCT l5 U-bend Support Structure Wear Remain In-Service I 105 68 DS2 0.62 PCT 2t U-bend Support Stnrcture Wear Remain In-Service I 105 68 VS2-0.03 PCT l9 U-bend Support Stnrcture Wear Remain In-Service I 105 68 VS2-0.72 PCT l8 U-bend Support Structure Wear Remain In-Service I r05 68 VS4 1.03 PCT l7 U-bend Support Stnrcture Wear Remain In-Service I 105 68 DS2-0.23 PCT l5 U-bend Support Structure Wear Remain In-Service 2 65 98 VS2 t.24 PCT t7 U-bend Support Structure Wear Remain In-Service 2 67 96 VS2 1.05 PCT t4 U-bend Support Structure Wear Remain In-Service 2 75 54 VS4 0.86 PCT 22 U-bend Support Structure Wear Remain In-Service 2 90 67 VS4-0.76 PCT l8 U-bend Support Stnrcture Wear Remain In-Service 2 90 67 VS2-0.85 PCT t2 U-bend Support Stnrcture Wear Remain In-Service 2 9l 58 vs2 0.8 PCT 20 U-bend Support Stnrcture Wear Remain In-Service 2 96 63 VS3-0.64 PCT 22 U-bend Support Stnrcture Wear Remain In-Service 2 99 s8 VS4 0.8 PCT l8 U-bend Support Stmcture Wear Remain In-Service 2 r00 63 VS2-0.75 PCT 24 U-bend Support Stnrcture Wear Remain In-Service 2 100 63 VS2 0.55 PCT l8 U-bend Support Stnrcture Wear Remain In-Service 2 l0l 52 vst-0.93 PCT t3 U-bend Support Stnrcture Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 7 of 19 SG Row Col Locn Inchl Ind o/oTW Characterization Resolution

'3 24 69 DS4-0.03 PCT 23 U-bend Support Stnrcture Wear Remain In-Service 3 43 78 VS3 1.2 PCT t6 U-bend Support Stnrcture Wear Remain In-Service 3 50 85 vs3-0.38 PCT 20 U-bend Support Structure Wear Remain In-Service 3 53 82 VS3-0.12 PCT t9 U-bend Support Structure Wear Remain In-Service 3 63 82 VS3 1.35 PCT t7 U-bend Support Stnrcture Wear Remain In-Service 3&8l VS3 1.82 PCT l7 U-bend Support Stnrcture Wear Remain In-Service 3 8l 56 VS4 0.89 PCT 27 U-bend Support Structure Wear Remain In-Service 3 82 43 VS2-0.95 PCT l8 U-bend Support Structure Wear Remain In-Service 3 96 67 VS2-0.78 PCT l6 U-bend Support Structure Wear Remain In-Service 3 97 56 VS3 0.74 PCT 20 U-bend Support Structure Wear Remain In-Service 3 97 56 VS3 t.2l PCT l9 U-bend Support Stnrcture Wear Remain In-Service 3 97@DS3-0.83 PCT t9 U-bend Support Structure Wear Remain In-Service 3 98 7l VS4 0.t3 PCT 20 U-bend Support Stnrcture Wear Remain In-Service 3 99 50 DS3 0.82 PCT l8 U-bend Support Structure Wear Remain In-Service 3 99 58 VS4 0.96 PCT 2t U-bend Support Structure Wear Remain In-Service 3 99 s8 V34 0.03 PCT l7 U-bend Support Structure Wear Remain In-Service 3 r00 55 VS2-0.75 PCT 20 U-bend Support Stnrcture Wear Remain In-Service 3 100 63 DS3 0.8 PCT t7 U-bend Support Structure Wear Remain In-Service 3 100 67 DS3 0.7 5 PCT l8 U-bend Support Stnrcture Wear Remain In-Service 3 r0l 58 DS2-0.8 PCT 2t U-bend Support Stnrcture Wear Remain In-Service 3 l0l 58 VS4 0.84 PCT t9 U-bend Support Structure Wear Remain In-Service 3 l0l 58 VS3-0.31 PCT t7 U-bend Support Structure Wear Remain In-Service 3 102 73 VSI-0.91 PCT l9 U-bend Support Stmcture Wear Remain In-Service 4 92 8l VS2 0.9 PCT 23 U-bend Support Structure Wear Remain In-Service 4 93 70 VS2 0.92 PCT 19 U-bend Support Stnrcture Wear Remain In-Service 4 93 70 VS2 0.06 PCT l8 U-bend Support Stnrcture Wear Remain In-Service 4 93 70 VS2-0.82 PCT l8 U-bend Support Structure Wear Remain In-Service 4 93 80 vs2 0.96 PCT 2t U-bend Support Structure Wear Remain In-Service 4 93 80 vs2 0.2 PCT t7 U-bend Support Stnrcture Wear Remain In-Service 4 96 83 DS2-0.83 PCT 20 U-bend Support Structure Wear Remain In-Service 4 97 72 VS3-0.24 PCT l8 U-bend Support Stmcture Wear Remain In-Service 4 98 47 VS2 0.82 PCT l5 U-bend Support Structure Wear Remain In-Service 4 l0l 70 VS3 0.61 PCT t9 U-bend Support Structure Wear Remain In-Service 4 102 57 VS3 t.t4 PCT 22 U-bend Support Stnrcture Wear Remain In-Service 4 102 57 DS2-0.76 PCT 2t U-bend Support Structure Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 8 of 19 Table 2-5: Watts Bar U1R14 Ilorizontal Tube Support Grid Wear Indications - SG I SG Row Col Locn Inchl Ind (%rw Characterization Resolution I I 48 H04 1.06 PCT l8 Horizontal Grid Wear Remain In-Service I I 48 H07 0. l9 PCT l7 Horizontal Grid Wear Remain In-Service I I I l6 c04-0.88 PCT l8 Horizontal Grid Wear Remain In-Service 1 7 64 H09 0.66 PCT t9 Horizontal Grid Wear Remain In-Service I 7 88 H06-0.97 PCT 22 Horizontal Grid Wear Remain In-Service I 7 102 H08 0.63 PCT l8 Horizontal Grid Wear Remain In-Service I 8 99 H09 1.06 PCT t9 Horizontal Grid Wear Remain In-Service I 8 tzt c05-0.67 PCT l7 Horizontal Grid Wear Remain In-Service I 9 100 cl0-0.87 PCT t9 Horizontal Grid Wear Remain In-Service I 9 100 cll 0.76 PCT l8 Horizontal Grid Wear Remain In-Service I 9 104 H07-0.92 PCT 22 Horizontal Grid Wear Remain In-Service I l8 103 H07-0.92 PCT 20 Horizontal Grid Wear Remain In-Service I 23 84 clr 0.78 PCT l9 Horizontal Grid Wear Remain In-Service I 26 t23 c06-0.7 PCT r9 Horizontal Grid Wear Remain In-Service I 27 124 c06-0.84 PCT 20 Horizontal Grid Wear Remain In-Service I 28 45 clr 0.67 PCT t9 Horizontal Grid Wear Remain In-Service I 29 t24 c06 0.77 PCT 20 Horizontal Grid Wear Remain In-Service I 29 t24 c0s-0.9 PCT t7 Horizontal Grid Wear Remain In-Service I 34 t23 c05-0.87 PCT t9 Horizontal Grid Wear Remain In-Service I 59 n2 c06-0.67 PCT t7 Horizontal Grid Wear Remain In-Service I 60 ll5 c0s-0.67 PCT l8 Horizontal Grid Wear Remain In-Service I 67 tt2 c06 0.83 PCT t9 Horizontal Grid Wear Remain In-Service I 68 lll c06 0.75 PCT l8 Horizontal Grid Wear Remain In-Service I 7l ll0 c06 0.81 PCT t9 Horizontal Grid Wear Remain In-Service I 76 t07 c06 0.62 PCT 22 Horizontal Grid Wear Remain In-Service I 77 106 c06 0.72 PCT l8 Horizontal Grid Wear Remain In-Service I 79 104 c03-0,84 PCT t7 Horizontal Grid Wear Remain In-Service I 82 103 c04-0.7 4 PCT l5 Horizontal Grid Wear Remain In-Service I 83 26 c03 0.73 PCT l9 Horizontal Grid Wear Remain In-Service I 83 r02 c03-0.76 PCT l9 Horizontal Grid Wear Remain In-Service I 83 t02 c06 0.67 PCT l7 Horizontal Grid Wear Remain In-Service I 84 99 c04 0.75 PCT 22 Horizontal Grid Wear Remain In-Service I 84 99 c03-0.76 PCT l9 Horizontal Grid Wear Remain In-Service I 84 99 c07 I PCT l8 Horizontal Grid Wear Remain In-Service I 85 30 c03 0.73 PCT 2l Horizontal Grid Wear Remain In-Service I 85 94 c03 I PCT l8 Horizontal Grid Wear Remain In-Service I 85 98 c04 0.81 PCT l8 Horizontal Grid Wear Remain In-Service I 85 100 c03-0.79 PCT 27 Horizontal Grid Wear Remain In-Service I 86 97 c04 0.56 PCT t7 Horizontal Grid Wear Remain In-Service I 86 99 c03-0.9 PCT l8 Horizontal Grid Wear Remain In-Service 1 87 30 c02 0.73 PCT 2l Horizontal Grid Wear Remain In-Service I 87 96 c04-0.87 PCT l9 Horizontal Grid Wear Remain In-Service 1 87 98 c03 0.76 PCT 2l Horizontal Grid Wear Remain In-Service I 88 3l c03 0.78 PCT t7 Horizontal Grid Wear Remain In-Service I 88 95 c03-0.87 PCT 22 Horizontal Grid Wear Remain In-Service I 88 97 c03 0.78 PCT 2t Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 9 of 19 I 89 94 c04 0.73 PCT l8 Horizontal Grid Wear Remain In-Service I 89 96 c03-0.t9 PCT 33 Horizontal Grid Wear Remain In-Service I 90 93 c03-0.75 PCT 20 Horizontal Grid Wear Remain In-Service I 90 95 c04 0.59 PCT 22 Horizontal Grid Wear Remain In-Service I 90 95 c03-0.78 PCT 2t Horizontal Grid Wear Remain In-Service I 9l 90 c04-0.98 PCT t9 Horizontal Grid Wear Remain In-Service I 9l 92 c03-0.9 PCT l9 Horizontal Grid Wear Remain In-Service I 9l 94 c06 0.64 PCT 20 Horizontal Grid Wear Remain In-Service I 92 9l c03-0.9 PCT l8 Horizontal Grid Wear Remain In-Service I 92 93 c03-0.79 PCT 24 Horizontal Grid Wear Remain In-Service I 95 88 c03 0.7 5 PCT 22 Horizontal Grid Wear Remain In-Service I 96 89 c03-0.93 PCT l8 Horizontal Grid Wear Remain In-Service I 97 84 c07 0.78 PCT 2t Horizontal Grid Wear Remain In-Service I 97 84 c03-0.79 PCT 20 Horizontal Grid Wear Remain In-Service I 98 85 c05-0.92 PCT 22 Horizontal Grid Wear Remain In-Service I 98 85 c03 0.73 PCT 20 Horizontal Grid Wear Remain In-Service I 100 83 c05-0.95 PCT 23 Horizontal Grid Wear Remain In-Service I 100 83 c03 0.75 PCT 22 Horizontal Grid Wear Remain In-Service I t0l 66 c03 0.78 PCT l7 Horizontal Grid Wear Remain In-Service I l0l 78 c03-0.95 PCT 20 Horizontal Grid Wear Remain In-Service I 102 7l c03-0.8 r PCT t7 Horizontal Grid Wear Remain In-Service 1 102 7l c04 I PCT l6 Horizontal Grid Wear Remain In-Service I 102 79 c03 0.73 PCT 23 Horizontal Grid Wear Remain In-Service I 103 54 c03 0.9s PCT l8 Horizontal Grid Wear Remain In-Service I 103 74 c03 0.95 PCT l8 Horizontal Grid Wear Remain In-Service I 104 63 c03 0.78 PCT t8 Horizontal Grid Wear Remain In-Service I 105 64 c05-0.92 PCT 22 Horizontal Grid Wear Remain In-Service I 105 64 c03 0.7 5 PCT 20 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page l0 of 19 Table 2{: Watts Bar U1R14 Horizontal Tube Suooort Grid Wear Indications - SG 2 aDte z-oz wa o n u ear Inorcauons

-SG Row Col Locn Inchl Ind o/oTW Characterization Resolution 2 I 42 H04-0.8 PCT t6 Horizontal Grid Wear Remain In-Service 2 I 44 H08-0.91 PCT t6 Horizontal Grid Wear Remain In-Service 2 I 44 H04-0.86 PCT l3 Horizontal Grid Wear Remain In-Service 2 I 48 H04 0.91 PCT t7 Horizontal Grid Wear Remain In-Service 2 I 70 H05-0.95 PCT l6 Horizontal Grid Wear Remain In-Service 2 I 74 H04-0.6 PCT l8 Horizontal Grid Wear Remain In-Service 2 2 31 H06-0.99 PCT l9 Horizontal Grid Wear Remain In-Service

)2 4t H07-0.94 PCT t7 Horizontal Grid Wear Remain In-Service 2 2 53 H0s-0.72 PCT l6 Horizontal Grid Wear Remain In-Service 2 2 69 H04-0.94 PCT t7 Horizontal Grid Wear Remain In-Service

)L 2 73 H04-0.88 PCT l6 Horizontal Grid Wear Remain In-Service 2 2 l0l H06 0.86 PCT l7 Horizontal Grid Wear Remain In-Service 2 6 I c03 0.81 PCT l7 Horizontal Grid Wear Remain In-Senrice 2 8 I c03 0.56 PCT l8 Horizontal Grid Wear Remain In-Service 2 8 77 H08-0.98 PCT 25 Horizontal Grid Wear Remain In-Service 2 8 77 H07 l.0l PCT 2t Horizontal Grid Wear Remain In-Service 2 8 t27 c04 0.82 PCT 22 Horizontal Grid Wear Remain In-Service 2 8 127 c03 0.76 PCT 2t Horizontal Grid Wear Remain In-Service 2 t0 t27 c03 0.75 PCT 2t Horizontal Grid Wear Remain In-Service 2 t4 t23 c03 0.92 PCT t7 Horizontal Grid Wear Remain In-Service 2 l8 73 H07 r.04 PCT l9 Horizontal Grid Wear Remain In-Service 2 t9 124 c05-0.93 PCT l8 Horizontal Grid Wear Remain In-Service 2 l9 t24 c03 0,76 PCT t7 Horizontal Grid Wear Remain In-Service 2 t9 126 c03 0.79 PCT t7 Horizontal Grid Wear Remain In-Service 2 20 t23 c03 0.86 PCT l8 Horizontal Grid Wear Remain In-Service 2 2t t22 c09 1.04 PCT 20 Horizontal Grid Wear Remain In-Service 2 22 123 c03 0.73 PCT 30 Horizontal Grid Wear Remain In-Service 2 22 t23 c07 0.76 PCT 23 Horizontal Grid Wear Remain In-Service 2 22 r23 c07-0.92 PCT 23 Horizontal Grid Wear Remain In-Service 2 22 t23 c05 0.64 PCT l8 Horizontal Grid Wear Remain In-Service 2 22 123 c06 1.07 PCT l8 Horizontal Grid Wear Remain In-Service 2 22 t25 c03 0.7 PCT 18 Horizontal Grid Wear Remain In-Service 2 22 t25 c06 0.73 PCT r8 Horizontal Grid Wear Remain In-Service 2 23 44 ct2 0.67 PCT 20 Horizontal Grid Wear Remain In-Service 2 23 48 ct2-0.84 PCT t7 Horizontal Grid Wear Remain In-Service 2 23 t22 c03 0.76 PCT 22 Horizontal Grid Wear Remain In-Service

)25 28 ct2-0.79 PCT l3 Horizontal Grid Wear Remain In-Service 2 25 122 c03 0.76 PCT 23 Horizontal Grid Wear Remain In-Service 2 26 t23 c03 0.6s PCT 2t Horizontal Grid Wear Remain In-Service 2 26 123 CM 0.@PCT l9 Horizontal Grid Wear Remain In-Service 2 26 t23 c03-0.9s PCT l8 Horizontal Grid Wear Remain In-Service 2 26 t25 c03 0.t PCT l8 Horizontal Grid Wear Remain In-Service 2 27 4 c06 1.04 PCT l5 Horizontal Grid Wear Remain In-Service

)27 t24 c03 0.8 r PCT 2t Horizontal Grid Wear Remain In-Service 2 27 124 c05-0.98 PCT t9 Horizontal Grid Wear Remain In-Service

)28 ll9 c06-0.82 PCT 2t Horizontal Grid Wear Remain In-Service 2 28 t23 c03 0.78 PCT 26 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 11 of 19 SG Row Col Locn Inchl Ind YrTW Characterization Resolution 2 30 7 c06 0.76 PCT t6 Horizontal Grid Wear Remain In-Service 2 30 123 c06 0.84 PCT 27 Horizontal Grid Wear Remain In-Service 2 30 t23 c07-0.86 PCT 27 Horizontal Grid Wear Remain In-Service 2 30 t23 c03 0.73 PCT 26 Horizontal Grid Wear Remain In-Service 2 30 t23 c05-0.89 PCT 23 Horizontal Grid Wear Remain In-Service 2 30 123 c06-0.84 PCT 20 Horizontal Grid Wear Remain In-Service 2 30 123 c04 0.65 PCT l8 Horizontal Grid Wear Remain In-Service 2 3r 54 ct2 1.03 PCT 22 Horizontal Grid Wear Remain In-Service 2 32 t2t c03 0.73 PCT t9 Horizontal Grid Wear Remain In-Service 2 32 t2t c05-0.93 PCT l8 Horizontal Grid Wear Remain In-Service 2 33 t22 c03-0.9 PCT l9 Horizontal Grid Wear Remain In-Service 2 33 122 c04 0.73 PCT l8 Horizontal Grid Wear Remain In-Service 2 33 122 c07 0.s3 PCT l8 Horizontal Grid Wear Remain In-Service 2 36 7 c06-0.84 PCT l8 Horizontal Grid Wear Remain In-Service 2 36 t2t c03-0.92 PCT 20 Horizontal Grid Wear Remain In-Service 2 37 8 c03 0.75 PCT l8 Horizontal Grid Wear Remain In-Service 2 38 7 c03 0.94 PCT t6 Horizontal Grid Wear Remain In-Service 2 39 8 c07 1.07 PCT t5 Horizontal Grid Wear Remain In-Service 2 47 l0 c03 0.88 PCT t9 Horizontal Grid Wear Remain In-Service 2 50 9 c04-0.9 PCT l9 Horizontal Grid Wear Remain In-Service 2 5l ll8 c03-0.98 PCT l8 Horizontal Grid Wear Remain In-Service 2 53 I l8 c03-0.89 PCT 2t Horizontal Grid Wear Remain In-Service 2 s9 tt4 c04 0.62 PCT l5 Horizontal Grid Wear Remain In-Service 2 60 I 15 c03-0.96 PCT l9 Horizontal Grid Wear Remain In-Service 2 60 ll5 c06 l.t2 PCT l9 Horizontal Grid Wear Remain In-Service 2 60 I l5 c07 l.0r PCT l7 Horizontal Grid Wear Remain In-Service 2 62 l5 c0s 0.67 PCT l9 Horizontal Grid Wear Remain In-Service 2 62 t5 c04 1.03 PCT l7 Horizontal Grid Wear Remain In-Service 2 62 ll3 c07-0.98 PCT 25 Horizontal Grid Wear Remain In-Service 2 62 ll3 c03-0.95 PCT l8 Horizontal Grid Wear Remain In-Service 2 62 n3 c04 0.62 PCT l8 Horizontal Grid Wear Remain In-Service 2 63 tt4 c03 1.04 PCT t7 Horizontal Grid Wear Remain In-Service 2 63 tt4 c06 0.64 PCT l5 Horizontal Grid Wear Remain In-Service 2 64 l13 c03-0.87 PCT t7 Horizontal Grid Wear Remain In-Service 2 7l ll0 c05 0.65 PCT t6 Horizontal Grid Wear Remain In-Service 2 72 109 c03-t.2 PCT 20 Horizontal Grid Wear Remain In-Service 2 76 107 c03 0.65 PCT l6 Horizontal Grid Wear Remain In-Service 2 77 104 c03-0.76 PCT t9 Horizontal Grid Wear Remain In-Service 2 77 104 c04 I .01 PCT l8 Horizontal Grid Wear Remain In-Service 2 78 105 c03-0.82 PCT l8 Horizontal Grid Wear Remain In-Service 2 79 IM c03 1.04 PCT l8 Horizontal Grid Wear Remain In-Service 2 79 104 c04-0.96 PCT t7 Horizontal Grid Wear Remain In-Service 2 80 103 c06-0.9s PCT l9 Horizontal Grid Wear Remain In-Service 2 83 100 c04 0.54 PCT 20 Horizontal Grid Wear Remain In-Service 2 85 100 c06-0.99 PCT 2t Horizontal Grid Wear Remain In-Service 2 85 r00 c04 0.65 PCT l9 Horizontal Grid Wear Remain In-Service 2 85 100 c07 1.22 PCT l8 Horizontal Grid Wear Remain In-Service 2 86 97 c04 0.89 PCT l8 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 12 of 19 SG Row Col Locn Inchl Ind%TW Characterization Resolution 2 86 97 c03 0.68 PCT l7 Horizontal Grid Wear Remain In-Service 2 86 99 c04 0.7 PCT 22 Horizontal Grid Wear Remain In-Service 2 87 30 c03 0.74 PCT l8 Horizontal Grid Wear Remain In-Service 2 87 32 c06 1.72 PCT t9 Horizontal Grid Wear Remain In-Service 2 87 94 c04 0.73 PCT 20 Horizontal Grid Wear Remain In-Service 2 87 98 c06-0.95 PCT 30 Horizontal Grid Wear Remain In-Service 2 87 98 c03-0.9s PCT 23 Horizontal Grid Wear Remain In-Service 2 87 98 c04 0.67 PCT l9 Horizontal Grid Wear Remain In-Service 2 88 95 c03 1.04 PCT 37 Horizontal Grid Wear Remain In-Service 2 88 95 c03 0.53 PCT t6 Horizontal Grid Wear Remain In-Service 2 88 95 c06 0.78 PCT l6 Horizontal Grid Wear Remain In-Service 2 89 32 c03-0.94 PCT t9 Horizontal Grid Wear Remain In-Service 2 89 32 c03 0.82 PCT l6 Horizontal Grid Wear Remain In-Senrice 2 89 94 c03-0.98 PCT 25 Horizontal Grid Wear Remain In-Service 2 89 96 c06 1.04 PCT t7 Horizontal Grid Wear Remain In-Service 2 90 95 c04 0.73 PCT 23 Horizontal Grid Wear Remain In-Service 2 90 95 c07-0.95 PCT l8 Horizontal Grid Wear Remain In-Service 2 9t 94 c03-0.92 PCT 25 Horizontal Grid Wear Remain In-Service 2 92 35 c04-0.86 PCT l7 Horizontal Grid Wear Remain In-Service 2 92 35 c03-0.92 PCT l6 Horizontal Grid Wear Remain In-Service 2 92 93 c07-0.87 PCT l9 Horizontal Grid Wear Remain In-Service 2 92 93 c04 0.73 PCT l8 Horizontal Grid Wear Remain In-Service 2 92 93 c06-0.88 PCT l8 Horizontal Grid Wear Remain In-Service 2 95 82 c03 l.l5 PCT l7 Horizontal Grid Wear Remain In-Service 2 96 85 c06 0.89 PCT t9 Horizontal Grid Wear Remain In-Service 2 96 85 c07 1.06 PCT t7 Horizontal Grid Wear Remain In-Service 2 96 87 c03-0.82 PCT t8 Horizontal Grid Wear Remain In-Service 2 97 86 c03 t.t2 PCT l9 Horizontal Grid Wear Remain In-Service

)97 88 c03-0.96 PCT 20 Horizontal Grid Wear Remain In-Service 2 98 43 c05 0.71 PCT 20 Horizontal Grid Wear Remain In-Service 2 98 79 c03 t.t2 PCT l9 Horizontal Grid Wear Remain In-Service 2 98 83 c03 l.l8 PCT l8 Horizontal Grid Wear Remain In-Service 2 99 84 c02 0.62 PCT l6 Horizontal Grid Wear Remain In-Service 2 100 8l c04 0.78 PCT 23 Horizontal Grid Wear Remain In-Service 2 l0l 78 c03 l.l5 PCT 20 Horizontal Grid Wear Remain In-Service 2 l0l 80 c03 1.2 PCT 20 Horizontal Grid Wear Remain In-Service 2 103 62 c03 0.92 PCT t7 Horizontal Grid Wear Remain In-Service 2 103 66 c05 0.67 PCT 22 Horizontal Grid Wear Remain In-Service 2 103 74 c03 l.l5 PCT l9 Horizontal Grid Wear Remain In-Service 2 104 6l c06-0.9 PCT l6 Horizontal Grid Wear Remain In-Service 2 104 69 c05 0.7 PCT t9 Horizontal Grid Wear Remain In-Service 2 105 66 c03 0.72 PCT 23 Horizontal Grid Wear Remain In-Service 2 105 66 c05 0.67 PCT t7 Horizontal Grid Wear Remain In-Service 2 105 68 c03 0.75 PCT 20 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 13 of 19 Table2-72 Watts Bar U1R14 Horimntal Tube Suooort Grid Wear Indications - SG 3 able 2-72 Watts Bar UlRl4 Horizontal Tube Su ear tnotcauons

-SG Row Col Locn Inchl Ind%TW Characterization Resolution 3 I 72 H04-0.88 PCT l5 Horizontal Grid Wear Remain In-Service 3 I 72 H05-0.96 PCT t4 Horizontal Grid Wear Remain In-Service 3 I 72 H04 0.91 PCT l3 Horizontal Grid Wear Remain In-Service 3 I 78 H04-0.9r PCT 20 Horizontal Grid Wear Remain In-Service 3 I 86 H04-0.85 PCT l5 Horizontal Grid Wear Remain In-Service 3 7 2 c03 0.83 PCT t6 Horizontal Grid Wear Remain In-Service 3 9 r06 c06-0.78 PCT l8 Horizontal Grid Wear Remain In-Service 3 l0 I c03 0.72 PCT 23 Horizontal Grid Wear Remain In-Service 3 l0 I c05-0.92 PCT t7 Horizontal Grid Wear Remain In-Service 3 l3 4 c03 0.75 PCT l8 Horizontal Grid Wear Remain In-Service 3 t4 5l Hl0 0.68 PCT l8 Horizontal Grid Wear Remain In-Service 3 t4 5l clt 1.06 PCT t7 Horizontal Grid Wear Remain In-Senrice 3 t4 8r H06-0.9 PCT t8 Horizontal Grid Wear Remain In-Service 3 l5 2 c04-0.97 PCT 20 Horizontal Grid Wear Remain In-Service 3 l5 2 c03 0.83 PCT t7 Horizontal Grid Wear Remain In-Service 3 l5 4 c06-0.91 PCT l9 Horizontal Grid Wear Remain In-Service 3 t7 102 ct2 1.06 PCT 20 Horizontal Grid Wear Remain In-Service 3 t7 t02 cl2 0.66 PCT l8 Horizontal Grid Wear Remain In-Service 3 l8 53 ct2-0.89 PCT t7 Horizontal Grid Wear Remain In-Service 3 l9 2 c04-0.98 PCT 23 Horizontal Grid Wear Remain In-Service 3 20 6t cl0-0.98 PCT l9 Horizontal Grid Wear Remain In-Service 3 23 t24 c06 0.69 PCT 23 Horizontal Grid Wear Remain In-Service 3 24 3 c05 0.8 PCT l8 Horizontal Grid Wear Remain In-Service 3 26 5 c03-0.8 PCT l8 Horizontal Grid Wear Remain In-Service 3 28 I l9 ct2-0.86 PCT l8 Horizontal Grid Wear Remain In-Service 3 32 5 c03-0.89 PCT l8 Horizontal Grid Wear Remain In-Service 3 34 5 c03 I PCT 20 Horizontal Grid Wear Remain In-Service 3 53 r r8 c06 0.69 PCT l6 Horizontal Grid Wear Remain In-Service 3 59 t4 c03 1.03 PCT 2t Horizontal Grid Wear Remain In-Service 3 6t tt4 c06 0.83 PCT 26 Horizontal Grid Wear Remain In-Service 3 6l tt4 c06-0.75 PCT t7 Horizontal Grid Wear Remain In-Service 3 64 l7 c03-0.89 PCT l6 Horizontal Grid Wear Remain In-Service 3 64 lll c04-0.77 PCT l8 Horizontal Grid Wear Remain In-Service 3 64 lll c07 I PCT t4 Horizontal Grid Wear Remain In-Service 3 65 l8 c03-0.98 PCT l8 Horizontal Grid Wear Remain In-Service 3 67 n2 c06 l.l I PCT t6 Horizontal Grid Wear Remain In-Service 3 68 t9 c03 0.63 PCT l8 Horizontal Grid Wear Remain In-Service 3 7l r04 c03 0.87 PCT l7 Horizontal Grid Wear Remain In-Service 3 76 t07 c04 0.75 PCT 2t Horizontal Grid Wear Remain In-Service 3 76 t07 c06 0.8 PCT 20 Horizontal Grid Wear Remain In-Service 3 77 22 c03 0.72 PCT l6 Horizontal Grid Wear Remain In-Service 3 79 24 c03 0.75 PCT l8 Horizontal Grid Wear Remain In-Service 3 82 25 c03 0.69 PCT t6 Horizontal Grid Wear Remain In-Service 3 82 27 c03 0.67 PCT l6 Horizontal Grid Wear Remain In-Service 3 83 26 c03 0.95 PCT l5 Horizontal Grid Wear Remain In-Service 3 84 29 c03 0.72 PCT 20 Horizontal Grid Wear Remain In-Senrice 3 84 95 c05 0.91 PCT l6 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 14 of 19 SG Row Col Locn Inchl Ind o/oTW Characterization Resolution 3 84 99 c03-0.92 PCT t7 Horizontal Grid Wear Remain In-Service 3 85 28 c03 0.7s PCT 2t Horizontal Grid Wear Remain In-Service 3 85 96 c03 0.8 PCT l8 Horizontal Grid Wear Remain In-Service 3 85 98 c02-0.94 PCT 22 Horizontal Grid Wear Remain In-Service 3 86 3l c03 0.66 PCT t7 Horizontal Grid Wear Remain In-Service 3 86 95 c03 0.7 lPCT 20 Horizontal Grid Wear Remain In-Service 3 86 97 c02-0.82 PCT 22 Horizontal Grid Wear Remain In-Service 3 86 99 c05 0.74 PCT 22 Horizontal Grid Wear Remain In-Service 3 86 99 c02-0.85 PCT 2t Horizontal Grid Wear Remain In-Service 3 86 99 c04 0.62 PCT l8 Horizontal Grid Wear Remain In-Service 3 86 99 c03-0.89 PCT t7 Horizontal Grid Wear Remain In-Service 3 89 32 c03 0.69 PCT l8 Horizontal Grid Wear Remain In-Service 3 89 96 c03-0.92 PCT 22 Horizontal Grid Wear Remain In-Servrce 3 90 33 c03 0.66 PCT 2t Horizontal Grid Wear Remain In-Service 3 90 93 c04-0.97 PCT l5 Horizontal Grid Wear Remain In-Service 3 90 95 c04-0.8s PCT t8 Horizontal Grid Wear Remain In-Service 3 90 95 c03-0.8 PCT l7 Horizontal Grid Wear Remain In-Service 3 9t 34 c03-0.92 PCT 25 Horizontal Grid Wear Remain In-Service 3 92 35 c03-0.98 PCT 25 Horizontal Grid Wear Remain In-Service 3 92 9l c03-0.83 PCT l9 Horizontal Grid Wear Remain In-Service 3 92 9l c0s-0.95 PCT t6 Horizontal Grid Wear Remain In-Service 3 92 93 c04-0.98 PCT t7 Horizontal Grid Wear Remain In-Service 3 93 36 c03-0.89 PCT l8 Horizontal Grid Wear Remain In-Service 3 93 36 c04 0.69 PCT 18 Horizontal Grid Wear Remain In-Service 3 93 90 c03 0.8 PCT l9 Horizontal Grid Wear Remain In-Service 3 94 37 c06-0.92 PCT t9 Horizontal Grid Wear Remain In-Service 3 94 4t c07 t.t2 PCT 21 Horizontal Grid Wear Remain In-Service 3 94 89 c03-0.92 PCT l8 Horizontal Grid Wear Remain In-Service 3 95 38 c02-0.77 PCT l9 Horizontal Grid Wear Remain In-Service 3 95 38 c04 0.69 PCT t7 Horizontal Grid Wear Remain In-Service 3 96 85 c06 0.79 PCT 19 Horizontal Grid Wear Remain In-Service 3 97 40 c04 0.72 PCT t6 Horizontal Grid Wear Remain In-Service 3 97 42 c04 0.69 PCT 26 Horizontal Grid Wear Remain In-Service 3 97 42 c06 0.86 PCT t6 Horizontal Grid Wear Remain In-Service 3 100 75 c03 0.72 PCT l8 Horizontal Grid Wear Remain In-Service 3 t0l 68 c03 0.8 PCT 2l Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 15 of 19 2-8 w tts Ba U1Rl4 H a rUZO tal T be Su SG-SGMP-17-20 Revision 0 aDte l-IJi warfs lrar ull(rlt rlo n u SG Row Col Locn Inchl Ind o/oTW Characterization Resolution 4 3 42 cil-0.96 PCT 23 Horizontal Grid Wear Remain In-Service 4 3 42 ct2 1.09 PCT l9 Horizontal Grid Wear Remain In-Service 4 6 37 cll I .01 PCT t7 Horizontal Grid Wear Remain In-Service 4 6 73 H07-0.87 PCT 2l Horizontal Grid Wear Remain In-Service 4 6 127 c03 0.76 PCT 23 Horizontal Grid Wear Remain In-Service 4 9 40 cll-0.96 PCT t7 Horizontal Grid Wear Remain In-Service 4 9 42 H06 0.62 PCT 24 Horizontal Grid Wear Remain In-Service 4 9 42 H07 0.72 PCT t7 Horizontal Grid Wear Remain In-Service 4 l0 4t c09-0.87 PCT t9 Horizontal Grid Wear Remain In-Service 4 l0 6l H07 t.t2 PCT l8 Horizontal Grid Wear Remain In-Service 4 t2 7l H06-0.86 PCT 22 Horizontal Grid Wear Remain ln-Service 4 t2 7l H07-t.23 PCT 22 Horizontal Grid Wear Remain In-Service 4 l3 78 cl0 0.64 PCT 3l Horizontal Grid Wear Remain In-Service 4 t4 3 c04 0.69 PCT 20 Horizontal Grid Wear Remain In-Service 4 r8 63 ct2 0.61 PCT 23 Horizontal Grid Wear Remain In-Service 4 l8 63 cll 0.64 PCT 2t Horizontal Grid Wear Remain In-Service 4 22 123 c03 l.l PCT l8 Horizontal Grid Wear Remain In-Service 4 23 t24 c03-0.88 PCT 2t Horizontal Grid Wear Remain In-Service 4 23 r24 c06-0.84 PCT 2t Horizontal Grid Wear Remain In-Service 4 24 9l H06-0.22 PCT t9 Horizontal Grid Wear Remain In-Service 4 24 125 c03 0.87 PCT 24 Horizontal Grid Wear Remain In-Service 4 24 t25 c06 0.75 PCT l8 Horizontal Grid Wear Remain In-Service 4 25 62 cll 0.67 PCT 20 Horizontal Grid Wear Remain In-Service 4 26 3s ct2-0.92 PCT t7 Horizontal Grid Wear Remain In-Service 4 26 t23 c04 0.7 6 PCT 2t Horizontal Grid Wear Remain In-Service 4 26 123 c08-0.93 PCT l9 Horizontal Grid Wear Remain In-Service 4 26 123 c03-0.9 PCT l8 Horizontal Grid Wear Remain In-Service 4 27 124 c03-0.93 PCT 23 Horizontal Grid Wear Remain In-Service 4 28 123 c04-0.87 PCT 20 Horizontal Grid Wear Remain In-Service 4 30 5 c05-0.78 PCT l8 Horizontal Grid Wear Remain In-Service 4 3l 124 c03-0.93 PCT 20 Horizontal Grid Wear Remain In-Service 4 32 5 c02 0.76 PCT t7 Horizontal Grid Wear Remain In-Service 4 32 7 c02 0.82 PCT 20 Horizontal Grid Wear Remain In-Service 4 32 7 c03 0.73 PCT l8 Horizontal Grid Wear Remain In-Service 4 33 8 c03 0.94 PCT l8 Horizontal Grid Wear Remain In-Service 4 3s t22 c03 0.97 PCT 20 Horizontal Grid Wear Remain In-Service 4 43 8 c04 0.98 PCT l9 Horizontal Grid Wear Remain In-Service 4 44 9 c06-0.7 PCT l8 Horizontal Grid Wear Remain In-Service 4 44 t2t c03 I PCT 22 Horizontal Grid Wear Remain In-Service 4 45 8 c03-0.82 PCT r8 Horizontal Grid Wear Remain In-Service 4 49 il0 ct2-0.48 PCT l8 Horizontal Grid Wear Remain In-Service 4 50 87 H0l-t.22 PCT l9 Horizontal Grid Wear Remain In-Service 4 53 r l8 c02-0.87 PCT 2l Horizontal Grid Wear Remain In-Service 4 60 I 15 c07 0.9 PCT 18 Horizontal Grid Wear Remain In-Service 4 63 tt4 c06 l.l I PCT 2l Horizontal Grid Wear Remain In-Service 4 6s tt2 c05-0.84 PCT t9 Horizontal Grid Vlear Remain In-Servrce 4 7t 108 c06 0.73 PCT t6 Horizontal Grid Wear Remain In-Service rt Grid Wear Indications - SG 4 June 2017 Page 16 of 19 SG Row Col Locn Inchl Ind o/oTW Characterization Resolution 4 77 104 c03 0.71 PCT 26 Horizontal Grid Wear Remain In-Service 4 78 103 c03 0.8 PCT t8 Horizontal Grid Wear Remain In-Service 4 83 98 c03 0.71 PCT l8 Horizontal Grid Wear Remain In-Service 4 83 98 c04-0.9 PCT t6 Horizontal Grid Wear Remain In-Service 4 83 100 c03 0.72 PCT 20 Horizontal Grid Wear Remain In-Service 4 84 97 c04-0.94 PCT 20 Horizontal Grid Wear Remain In-Service 4 84 97 c03 0.74 PCT l9 Horizontal Grid Wear Remain In-Service 4 84 l0l c04-0.94 PCT 22 Horizontal Grid Wear Remain In-Service 4 84 l0l c03 0.71 PCT 2t Horizontal Grid Wear Remain In-Senrice 4 84 l0r c02 0.68 PCT 20 Horizontal Grid Wear Remain In-Service 4 84 l0l c06-0.91 PCT l8 Horizontal Grid Wear Remain In-Service 4 85 28 c03-0.86 PCT 22 Horizontal Grid Wear Remain In-Service 4 85 94 c03-0.84 PCT 20 Horizontal Grid Wear Remain In-Service 4 85 96 c04-0.95 PCT t8 Horizontal Grid Wear Remain In-Service 4 85 100 c04-0.86 PCT 20 Horizontal Grid Wear Remain In-Service 4 87 92 CM 0.78 PCT r9 Horizontal Grid Wear Remain In-Service 4 87 96 c03-0.89 PCT 24 Horizontal Grid Wear Remain In-Service 4 87 96 c05-0.72 PCT t9 Horizontal Grid Wear Remain In-Service 4 87 98 c04-0.89 PCT 20 Horizontal Grid Wear Remain In-Service 4 88 3l c03-0.95 PCT 22 Horizontal Grid Wear Remain In-Service 4 88 95 c03-0.75 PCT t7 Horizontal Grid Wear Remain In-Service 4 89 94 c0s 0.66 PCT t7 Horizontal Grid Wear Remain In-Service 4 89 96 c03-0.89 PCT 23 Horizontal Grid Wear Remain In-Service 4 89 96 c05 0.7 lPCT l8 Horizontal Grid Wear Remain In-Service 4 90 35 c03 I .18 PCT l9 Horizontal Grid Wear Remain In-Service 4 90 39 c04 0.88 PCT l7 Horizontal Grid Wear Remain In-Service 4 90 9l c04-0.92 PCT l8 Horizontal Grid Wear Remain In-Service 4 9l 34 c03-0.89 PCT 24 Horizontal Grid Wear Remain In-Service 4 9t 34 c05 0.74 PCT 20 Horizontal Grid Wear Remain In-Service 4 9l 36 c04 0.7 t PCT 22 Horizontal Grid Wear Remain In-Service 4 9l 36 c03-t.2 PCT 2l Horizontal Grid Wear Remain In-Service 4 9l 38 c03-0.92 PCT 22 Horizontal Grid Wear Remain In-Service 4 9l 92 c04-0.8 PCT 20 Horizontal Grid Wear Remain In-Service 4 9l 94 c03 0.71 PCT 23 Horizontal Grid Wear Remain In-Service 4 92 37 c03-0.86 PCT 25 Horizontal Grid Wear Remain In-Service 4 92 9l c03 0.65 PCT t7 Horizontal Grid Wear Remain In-Service 4 92 93 c03 0.74 PCT 20 Horizontal Grid Wear Remain In-Service 4 93 36 c03-0.t 4 PCT 22 Horizontal Grid Wear Remain In-Service 4 93 36 c05 0.68 PCT 2t Horizontal Grid Wear Remain In-Service 4 94 37 c03 t.l7 PCT 34 Horizontal Grid Wear Remain In-Service 4 94 39 c03-0.86 PCT 22 Horizontal Grid Wear Remain In-Service 4 94 39 c07-0.92 PCT l8 Horizontal Grid Wear Remain In-Service 4 94 4l c03-0.92 PCT 23 Horizontal Grid Wear Remain In-Service 4 95 40 c0s 0.71 PCT l9 Horizontal Grid Wear Remain In-Service 4 95 40 c06 1.03 PCT l8 Horizontal Grid Wear Remain In-Service 4 95 42 c03-0.83 PCT 26 Horizontal Grid Wear Remain In-Service 4 95 86 c03 0.68 PCT 24 Horizontal Grid Wear Remain In-Service 4 96 4t c03 0.7 lPCT 22 Horizontal Grid Wear Remain In-Service SG-SGMP-17-20 Revision 0 June 2017 Page 17 of 19 SG Row Col Locn Inchl Ind%TW Characterization Resolution 4 96 4l c0s-0.98 PCT l9 Horizontal Grid Wear Remain In-Service 4 96 43 c03-0.95 PCT l9 Horizontal Grid Wear Remain In-Service 4 96 45 c03-0.92 PCT 2l Horizontal Grid Wear Remain In-Service 4 96 8l c03 0.92 PCT l8 Horizontal Grid Wear Remain In-Service 4 97 42 c0s-0.97 PCT 22 Horizontal Grid Wear Remain In-Service 4 97 78 c03 0.8 r PCT 2l Horizontal Grid Wear Remain In-Service 4 97 86 c03 0.74 PCT 25 Horizontal Grid Wear Remain In-Service 4 97 88 c03 0.8 PCT 2t Horizontal Grid Wear Remain In-Service 4 97 88 c03-0.74 PCT 18 Horizontal Grid V/ear Remain In-Service 4 97 88 c07-0.86 PCT 18 Horizontal Grid Wear Remain In-Service 4 98 43 c07 0.77 PCT l9 Horizontal Grid Wear Remain In-Service 4 98 43 c03-0.95 PCT l8 Horizontal Grid Wear Remain In-Service 4 98 45 c03-0.94 PCT 30 Horizontal Grid Wear Remain In-Service 4 98 8l c03 0.59 PCT l8 Horizontal Grid Wear Remain In-Service 4 98 85 c03 0.7 lPCT 23 Horizontal Grid Wear Remain In-Service 4 99 4 c03 0.88 PCT t9 Horizontal Grid Wear Remain In-Service 4 99 44 c06 0.79 PCT t7 Horizontal Grid Wear Remain In-Service 4 99 44 c08 0.71 PCT l7 Horizontal Grid Wear Remain In-Service 4 99 46 c03-0.89 PCT 22 Horizontal Grid Wear Remain In-Service 4 100 8r c03 0.7 PCT l8 Horizontal Grid Wear Remain In-Service 4 100 83 c03-0.86 PCT 2t Horizontal Grid Wear Remain In-Service 4 100 83 c07 t.t7 PCT l8 Horizontal Grid Wear Remain In-Service 4 l0t 80 c03 0.7 PCT 20 Horizontal Grid Wear Remain In-Service 4 t02 49 c03 0.8 PCT 2l Horizontal Grid Wear Remain In-Service 4 r02 5l c04 0.78 PCT l9 Horizontal Grid Wear Remain In-Service 4 t02 79 c03 0.73 PCT l9 Horizontal Grid Wear Remain In-Service 4 103 76 c03 0.67 PCT 2t Horizontal Grid Wear Remain In-Service 4 104 7l c03-0.9 PCT 23 Horizontal Grid Wear Remain In-Service

e. Number of Tubes Plugged During the Inspection Outage for Each Active Degradation Mechanism There were no tubes required to be plugged during the Watts Bar UlRl4 RSG in-service inspection.

Table 2-9 below provides the numbers of tubes plugged for each degradation mechanism detected.

This table also shows the numbers of tubes plugged before and after the UlRl4 outage as well as the percentage of tubes currently plugged.Table 2-92 Number of Tubes Plugged for Each Degradation Mechanism sclr scr2 SG13 SG14 Total Plugged Tubes prior to UlRl4 3 5 7 t4 29 Plugged for U-bend Support Structure Wear 0 0 0 0 0 Plugged for Horizontal Grid Wear 0 0 0 0 0 Total Plugged to Date 3 5 7 t4 29 Percentage Plugged to Date 0.06%0.t0%0.r4%0.274/0 a.r4%SG-SGMP-17-20 Revision 0 June 2017 Page l8 of 19

f. Total Number and Percentage of Tubes Plugged to Date Table 2-9 in the previous section provides the number and percentage of tubes plugged to date.g. The Results of Condition Monitoring, Including the Results of Tube Pulls and In-Situ Testing Tube Inteerity A condition monitoring (CM) assessment was performed as required by the WBNI steam generator progfam. The only tube degradation detected during the U1Rl4 inspection was wear at tube support structures.

The deepest indication had an estimated depth of 37%Ttl from the bobbin probe exam and was located at a horizontal support grid. Conservatively assuming an enveloping flaw length slightly greater than the width of the support (2.0 inches), the CM limit for horizontal support grid wear is 52%TW. This CM limit includes uncertainties for material properties, NDE depth sizing, and the burst pressure relationship.

Since the deepest flaw has an estimated depth less than the conservatively determined CM limit, the stnrctural integrity perfonnance criterion was met for the operating interval prior to UlR14.Since volumetric wear indications will leak and burst at essentially the same pressure, accident-induced leakage integnty at a much lower accident pressure differential is also demonstrated.

Operational leakage integrity was demonstrated by the absence of any detectable primary-to-secondary leakage during the operating interval prior to UlRl4. Since tube integrity was demonstrated analytically, in-sitr,r pressure testing was not required nor perfonned during the UlRl4 outage. No tube pulls were planned or performed during UlRl4.Visual Insoection Results Visual inspections were performed on both the primary and secondary sides during UlR14.Primary side inspections included visual inspections of all previously installed tube plugs as well as the channel head bowl cladding and the divider plate. The installed tube plug inspections showed no conditions indicative of improper installation or in-service degradation.

The visual inspections of the channel head bowl cladding and the divider plate showed no visually apparent evidence of degradation of the cladding, divider plate, or divider plate welds.Prior to the secondary side foreign object search and retrieval (FOSAR) inspections, sludge, scale, foreign objects, and other deposit accumulations at the top of the tubesheet were removed as part of the top of tubesheet sludge lancing process. The secondary side FOSAR inspections performed in all four SGs included visual examination of tube bundle periphery tubes from the hot leg and cold leg annulus and center no tube lane. A total of 6 foreign objects were removed from the top of the tubesheet region and 6 objects remain on the secondary side among the four SGs. The foreign objects remaining are all small pieces of metal, wires, and bristles.

Any foreign objects not able to be retrieved were characteized and an analysis performed to demonstrate acceptability of continued operation without exceeding the performance criteria.

A limited top of tubesheet in-bundle visual inspection was also performed in each SG for the purpose ofassessing and frending the level ofhardened deposit buildup in the kidney regron.h. The Effective Plugging Percentage for All Plugging in Each SG There are no sleeves installed in the WBN1 replacement SGs. Therefore, the effective plugging percentage is the same as the plugging percentage shown in Table 2-9.SG-SGMP-17-20 Revision 0 June 2017 Page 19 of 19