ML17209A554

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Watts Bar, Unit 1 - Cycle 14 Steam Generator Tube Inspection Report
ML17209A554
Person / Time
Site: Watts Bar Tennessee Valley Authority icon.png
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)
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Text

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

Subject:

Watts Bar Nuclear Plant (WBN) Unit 1 - Cycle 14 Steam Generator Tubelnspection Reportln accordance with the requirements of WBN Technical Specification (TS) 5.9.9, "SteamGenerator 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 180days 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 thecomplete results of the tube inspections.

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

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

Pau! SimmonsSite Vice President Watts Bar Nuclear Plant

Enclosure:

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

NRC Regional Administrator

- Region llNRC Project Manager - Watts Bar Nuclear Plant, Unit 1NRC Senior Resident lnspector

- Watts Bar Nuclear Plant, Unit 1 Enclosure Watts Bar UlR14 180 Day Steam Generator Tube lnspection Report WTSTTNGHOUSE NON-PnoprueTARY CIess 3SCr-SGMP-17-20 Revision 0June 2017Watts Bar U1R14180 Day Steam Generator TUbe Inspection Report WESTINGHOUSE NON-PROPRIETARY CLASS 3SCr-SGMP-17-20 Revision 0Waffs Bar U1R14180 Day Steam Generator Tube Inspection ReportPrepared for:Tennessee Valley Authority Author's Name:William R. LaMantiaSG Management ProgramsVerifier's Name:Jesse S. BaronSG Management ProgramsManager's Name:David P. Lytle, ManagerSG Management ProgramsRevierverts Name:Jercmyl[/.

MayoTYA SGPrograrnManager Reviewer'sNnmel Tarnmy C. $earsTYA Watts Bar SG Progmm O$merRtvlewgr'r NnnrtrDaniclP, FolsomTYA NDHLevel IIISignature lDate*E I ec tron i caII v A p pro vedFor PagesAllSignature lDate*EI ectron i c aII v A p pro vedFor PagesAllSignature I Date*Electronicallv A o orovedFor PagesAllSignnture I DateDateFor FageoFor PagesSign*ffir*

/-"&\* Electronically Approved Records are Authcnticeted in the Elcafronic Document Menagcmeat System02017 Westinghouse Electric Company LtCAlt Rights ReservedSignature

/SG-SGMP-17-20 Revision 0June 2017Page 2 of 19 Record of Revisions RevisionDateDescription 0aJune2017Preliminary draft for Tennessee Valley Authority review and corrment.

0SeeEMDSOriginal IssueSG-SGMP-17-20 Revision 0June 2017Page 3 of 19 Table of Contents2.0 180 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 lnducedIndications.

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

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

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

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

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

.5Table 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.oD.h.SG-SGMP-17-20 Revision 0Jnne 2017Page 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 currenttest.g of the SG tubing as well as primary and secondary side cleanings and visual inspections.

Thisreport documents the "Watts Bar UlRl4 180-Day Steam Generator Tube lnspection Report" as requiredby the WBN1 Technical Specifications.

The original steam generators at WBNI were replaced in 2006 with Westinghouse Model 68AXP SGswhich 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 theprevious inspection at UlRl l. Figure l-l below provides the arrangement and location designation of thetube support structures for the WBN1 SGs.AXIAL fLottilL.-,- C0LD SIDI);rr RECIRCULATING TNTRANCTCROSS TLOWHOT SIDERECIRCULATINO ENTRANCTCROSS TLOWFigure 1-1: Tube Support Arrangement for Watts Bar Unit I Model68AXP Replacement Steam Generators Notes: VS : Vertical StrapDS : Diagonal StrapHTS/CTS : Hot/Cold Tubesheet (designates top of tubesheet)

HTE/CTE : Hot/Cold Tube EndHorizontal supports are a lattice grid designSG-SGMP-17-20 Revision 0Jtrne 2017Page 5 of 19 2.0180 Day Steam Generator Tube Inspection ReportIn accordance with WBNI Technical Specification Section 5.7.2.12, "Steam Generator Program",

andTechnical 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 followedwith the associated infonnation based on the inspections performed during U1R14.a. The Scope of the Inspections Performed on Each SGThe UlRl4 outage included a combination of bobbin and array coil inspections of 100% of thefull length in all in-service tubes except for tubes in Rows I through 4. Tube Rows I through 4were inspected to the frst support with the combination bobbin and array coil from both the hotleg tube end (HTE) and the cold leg tube end (CTE). The remainder of the tube length in Rows Ithrough 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 ofdegradation and all tubes not inspected during the previous SG in-service inspection.

The tablebelow summarizes the number and type of eddy current examinations performed during UlR14.Table 2-1: Watts Bar U1R14 Steam Generator Eddy Current Inspection ScopeEddy Current Exam TVpesGlsG2sG3sG4Total0.610 tIL Bobbin & Array VS3-HTE5,1255,1235,1215,11420,4830.610 CL Bobbin & Array VS3-CTE5,1255,1235,1215,11420,4830.590 HLICL Bobbin (U-bend Region)t27t27t27t27s08In addition to the eddy current inspections, visual inspections were also performed on both theprimary and secondary sides. Primary side visual inspections included all previously installed tube plugs, the channel head bowl cladding, and the divider plate. Secondary side visualinspections 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 FoundVolumetric wear was the only degradation mechanism detected during the UlRl4 inspection.

Allof the wear indications detected were located at either U-bend or horizontal tube supportstructures.

Table 2-2 below shows the number of indications reported during the UlR14inspection.

Table2-22 Number of Indications Detected for Each Degradation Mechanism Degradation Mechanism scl1sG12sG13SGl4TotalU-bend Support Stmcnre Wearl3lt23t259Horizontal Tube Support Grid Wear7413983t23419c. Nondestructive Examination (NDE) Techniques Used for Each Degradation Mechanism Table 2-3 below provides the NDE techniques that were used for the detection of eachdegradation mechanism that was considered as existing or potential for the UlRl4 inspection.

SG-SGMP-17-20 Revision 0Jtrne 2017Page 6 of 19 Table 2-3: I\DE Techniques for Each Existing or Potential Degradation Mechanism Degradation Mechanism Detection Technique EPRI ETSSU-BendSupport Stmcture WearBobbinArrayArrayArrayArray96004.1, Revision l3I 1956. l, Revision 211956.2, Revision 2I 1956.3, Revision 211956.4.

Revision2 Horizontal Tube Support Grid WearBobbinArrayArrayArrayArray96004.1, Revision l3I 1956.1, Revision 211956.2, Revision2 I1956.3, Revision2 11956.4.

Revision2 Foreign Object WearBobbinArrayArrayArrayArray27091.2, Revision 2I 1956.1, Revision 211956.2, Revision 2I1956.3, Revision 211956.4.

Revision2 Tube-to-Tube WearBobbin96010.1, RevisionT

d. Location, Orientation (if Linear),

and Measured Sizes (if Available) of Service InducedIndications Table 2-4 through 2-8 below provides a listing of all service-induced indications reported duringthe UlRl4 inspection including the estimated depths from the bobbin coil.Table 24: lVatts Bar U1R14 U-bend Support Structure Wear fndications

- All SGsSGRowColLocnInchlIndYuTWCharacterization Resolution I5374VS4l. t5PCTl5U-bend Support Stnrcnre WearRemain In-Service I5847VS31.29PCTl6U-bend Support Structure WearRemain In-Service I5847VS3-0.96PCTl6U-bend Support Structure WearRemain In-Service I6665V540.86PCTr9U-bend Support Structure WearRemain In-Service I7756VS3-0.9rPCTl8U-bend Support Structure WearRemain In-Service I7782VS3t.t2PCTt7U-bend Support Stnrcture WearRemain In-Senrice I8283VS4I.0rPCTt8U-bend Support Structure WearRemain In-Service I9558VS2-0.61PCTl5U-bend Support Structure WearRemain In-Service I10568DS20.62PCT2tU-bend Support Stnrcture WearRemain In-Service I10568VS2-0.03PCTl9U-bend Support Stnrcture WearRemain In-Service I10568VS2-0.72PCTl8U-bend Support Structure WearRemain In-Service Ir0568VS41.03PCTl7U-bend Support Stnrcture WearRemain In-Service I10568DS2-0.23PCTl5U-bend Support Structure WearRemain In-Service 26598VS2t.24PCTt7U-bend Support Structure WearRemain In-Service 26796VS21.05PCTt4U-bend Support Structure WearRemain In-Service 27554VS40.86PCT22U-bend Support Structure WearRemain In-Service 29067VS4-0.76PCTl8U-bend Support Stnrcture WearRemain In-Service 29067VS2-0.85PCTt2U-bend Support Stnrcture WearRemain In-Service 29l58vs20.8PCT20U-bend Support Stnrcture WearRemain In-Service 29663VS3-0.64PCT22U-bend Support Stnrcture WearRemain In-Service 299s8VS40.8PCTl8U-bend Support Stmcture WearRemain In-Service 2r0063VS2-0.75PCT24U-bend Support Stnrcture WearRemain In-Service 210063VS20.55PCTl8U-bend Support Stnrcture WearRemain In-Service 2l0l52vst-0.93PCTt3U-bend Support Stnrcture WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 7 of 19 SGRowColLocnInchlIndo/oTWCharacterization Resolution

'32469DS4-0.03PCT23U-bend Support Stnrcture WearRemain In-Service 34378VS31.2PCTt6U-bend Support Stnrcture WearRemain In-Service 35085vs3-0.38PCT20U-bend Support Structure WearRemain In-Service 35382VS3-0.12PCTt9U-bend Support Structure WearRemain In-Service 36382VS31.35PCTt7U-bend Support Stnrcture WearRemain In-Service 3&8lVS31.82PCTl7U-bend Support Stnrcture WearRemain In-Service 38l56VS40.89PCT27U-bend Support Structure WearRemain In-Service 38243VS2-0.95PCTl8U-bend Support Structure WearRemain In-Service 39667VS2-0.78PCTl6U-bend Support Structure WearRemain In-Service 39756VS30.74PCT20U-bend Support Structure WearRemain In-Service 39756VS3t.2lPCTl9U-bend Support Stnrcture WearRemain In-Service 397@DS3-0.83PCTt9U-bend Support Structure WearRemain In-Service 3987lVS40.t3PCT20U-bend Support Stnrcture WearRemain In-Service 39950DS30.82PCTl8U-bend Support Structure WearRemain In-Service 39958VS40.96PCT2tU-bend Support Structure WearRemain In-Service 399s8V340.03PCTl7U-bend Support Structure WearRemain In-Service 3r0055VS2-0.75PCT20U-bend Support Stnrcture WearRemain In-Service 310063DS30.8PCTt7U-bend Support Structure WearRemain In-Service 310067DS30.7 5PCTl8U-bend Support Stnrcture WearRemain In-Service 3r0l58DS2-0.8PCT2tU-bend Support Stnrcture WearRemain In-Service 3l0l58VS40.84PCTt9U-bend Support Structure WearRemain In-Service 3l0l58VS3-0.31PCTt7U-bend Support Structure WearRemain In-Service 310273VSI-0.91PCTl9U-bend Support Stmcture WearRemain In-Service 4928lVS20.9PCT23U-bend Support Structure WearRemain In-Service 49370VS20.92PCT19U-bend Support Stnrcture WearRemain In-Service 49370VS20.06PCTl8U-bend Support Stnrcture WearRemain In-Service 49370VS2-0.82PCTl8U-bend Support Structure WearRemain In-Service 49380vs20.96PCT2tU-bend Support Structure WearRemain In-Service 49380vs20.2PCTt7U-bend Support Stnrcture WearRemain In-Service 49683DS2-0.83PCT20U-bend Support Structure WearRemain In-Service 49772VS3-0.24PCTl8U-bend Support Stmcture WearRemain In-Service 49847VS20.82PCTl5U-bend Support Structure WearRemain In-Service 4l0l70VS30.61PCTt9U-bend Support Structure WearRemain In-Service 410257VS3t.t4PCT22U-bend Support Stnrcture WearRemain In-Service 410257DS2-0.76PCT2tU-bend Support Structure WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 8 of 19 Table 2-5: Watts Bar U1R14 Ilorizontal Tube Support Grid Wear Indications

- SG ISGRowColLocnInchlInd(%rwCharacterization Resolution II48H041.06PCTl8Horizontal Grid WearRemain In-Service II48H070. l9PCTl7Horizontal Grid WearRemain In-Service III l6c04-0.88PCTl8Horizontal Grid WearRemain In-Service 1764H090.66PCTt9Horizontal Grid WearRemain In-Service I788H06-0.97PCT22Horizontal Grid WearRemain In-Service I7102H080.63PCTl8Horizontal Grid WearRemain In-Service I899H091.06PCTt9Horizontal Grid WearRemain In-Service I8tztc05-0.67PCTl7Horizontal Grid WearRemain In-Service I9100cl0-0.87PCTt9Horizontal Grid WearRemain In-Service I9100cll0.76PCTl8Horizontal Grid WearRemain In-Service I9104H07-0.92PCT22Horizontal Grid WearRemain In-Service Il8103H07-0.92PCT20Horizontal Grid WearRemain In-Service I2384clr0.78PCTl9Horizontal Grid WearRemain In-Service I26t23c06-0.7PCTr9Horizontal Grid WearRemain In-Service I27124c06-0.84PCT20Horizontal Grid WearRemain In-Service I2845clr0.67PCTt9Horizontal Grid WearRemain In-Service I29t24c060.77PCT20Horizontal Grid WearRemain In-Service I29t24c0s-0.9PCTt7Horizontal Grid WearRemain In-Service I34t23c05-0.87PCTt9Horizontal Grid WearRemain In-Service I59n2c06-0.67PCTt7Horizontal Grid WearRemain In-Service I60ll5c0s-0.67PCTl8Horizontal Grid WearRemain In-Service I67tt2c060.83PCTt9Horizontal Grid WearRemain In-Service I68lllc060.75PCTl8Horizontal Grid WearRemain In-Service I7lll0c060.81PCTt9Horizontal Grid WearRemain In-Service I76t07c060.62PCT22Horizontal Grid WearRemain In-Service I77106c060.72PCTl8Horizontal Grid WearRemain In-Service I79104c03-0,84PCTt7Horizontal Grid WearRemain In-Service I82103c04-0.7 4PCTl5Horizontal Grid WearRemain In-Service I8326c030.73PCTl9Horizontal Grid WearRemain In-Service I83r02c03-0.76PCTl9Horizontal Grid WearRemain In-Service I83t02c060.67PCTl7Horizontal Grid WearRemain In-Service I8499c040.75PCT22Horizontal Grid WearRemain In-Service I8499c03-0.76PCTl9Horizontal Grid WearRemain In-Service I8499c07IPCTl8Horizontal Grid WearRemain In-Service I8530c030.73PCT2lHorizontal Grid WearRemain In-Service I8594c03IPCTl8Horizontal Grid WearRemain In-Service I8598c040.81PCTl8Horizontal Grid WearRemain In-Service I85100c03-0.79PCT27Horizontal Grid WearRemain In-Service I8697c040.56PCTt7Horizontal Grid WearRemain In-Service I8699c03-0.9PCTl8Horizontal Grid WearRemain In-Service 18730c020.73PCT2lHorizontal Grid WearRemain In-Service I8796c04-0.87PCTl9Horizontal Grid WearRemain In-Service 18798c030.76PCT2lHorizontal Grid WearRemain In-Service I883lc030.78PCTt7Horizontal Grid WearRemain In-Service I8895c03-0.87PCT22Horizontal Grid WearRemain In-Service I8897c030.78PCT2tHorizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 9 of 19 I8994c040.73PCTl8Horizontal Grid WearRemain In-Service I8996c03-0.t9PCT33Horizontal Grid WearRemain In-Service I9093c03-0.75PCT20Horizontal Grid WearRemain In-Service I9095c040.59PCT22Horizontal Grid WearRemain In-Service I9095c03-0.78PCT2tHorizontal Grid WearRemain In-Service I9l90c04-0.98PCTt9Horizontal Grid WearRemain In-Service I9l92c03-0.9PCTl9Horizontal Grid WearRemain In-Service I9l94c060.64PCT20Horizontal Grid WearRemain In-Service I929lc03-0.9PCTl8Horizontal Grid WearRemain In-Service I9293c03-0.79PCT24Horizontal Grid WearRemain In-Service I9588c030.7 5PCT22Horizontal Grid WearRemain In-Service I9689c03-0.93PCTl8Horizontal Grid WearRemain In-Service I9784c070.78PCT2tHorizontal Grid WearRemain In-Service I9784c03-0.79PCT20Horizontal Grid WearRemain In-Service I9885c05-0.92PCT22Horizontal Grid WearRemain In-Service I9885c030.73PCT20Horizontal Grid WearRemain In-Service I10083c05-0.95PCT23Horizontal Grid WearRemain In-Service I10083c030.75PCT22Horizontal Grid WearRemain In-Service It0l66c030.78PCTl7Horizontal Grid WearRemain In-Service Il0l78c03-0.95PCT20Horizontal Grid WearRemain In-Service I1027lc03-0.8 rPCTt7Horizontal Grid WearRemain In-Service 11027lc04IPCTl6Horizontal Grid WearRemain In-Service I10279c030.73PCT23Horizontal Grid WearRemain In-Service I10354c030.9sPCTl8Horizontal Grid WearRemain In-Service I10374c030.95PCTl8Horizontal Grid WearRemain In-Service I10463c030.78PCTt8Horizontal Grid WearRemain In-Service I10564c05-0.92PCT22Horizontal Grid WearRemain In-Service I10564c030.7 5PCT20Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page l0 of 19 Table 2{: Watts Bar U1R14 Horizontal Tube Suooort Grid Wear Indications

- SG 2aDte z-oz waonuear Inorcauons

-SGRowColLocnInchlIndo/oTWCharacterization Resolution 2I42H04-0.8PCTt6Horizontal Grid WearRemain In-Service 2I44H08-0.91PCTt6Horizontal Grid WearRemain In-Service 2I44H04-0.86PCTl3Horizontal Grid WearRemain In-Service 2I48H040.91PCTt7Horizontal Grid WearRemain In-Service 2I70H05-0.95PCTl6Horizontal Grid WearRemain In-Service 2I74H04-0.6PCTl8Horizontal Grid WearRemain In-Service 2231H06-0.99PCTl9Horizontal Grid WearRemain In-Service

)24tH07-0.94PCTt7Horizontal Grid WearRemain In-Service 2253H0s-0.72PCTl6Horizontal Grid WearRemain In-Service 2269H04-0.94PCTt7Horizontal Grid WearRemain In-Service

)L273H04-0.88PCTl6Horizontal Grid WearRemain In-Service 22l0lH060.86PCTl7Horizontal Grid WearRemain In-Service 26Ic030.81PCTl7Horizontal Grid WearRemain In-Senrice 28Ic030.56PCTl8Horizontal Grid WearRemain In-Service 2877H08-0.98PCT25Horizontal Grid WearRemain In-Service 2877H07l.0lPCT2tHorizontal Grid WearRemain In-Service 28t27c040.82PCT22Horizontal Grid WearRemain In-Service 28127c030.76PCT2tHorizontal Grid WearRemain In-Service 2t0t27c030.75PCT2tHorizontal Grid WearRemain In-Service 2t4t23c030.92PCTt7Horizontal Grid WearRemain In-Service 2l873H07r.04PCTl9Horizontal Grid WearRemain In-Service 2t9124c05-0.93PCTl8Horizontal Grid WearRemain In-Service 2l9t24c030,76PCTt7Horizontal Grid WearRemain In-Service 2t9126c030.79PCTt7Horizontal Grid WearRemain In-Service 220t23c030.86PCTl8Horizontal Grid WearRemain In-Service 22tt22c091.04PCT20Horizontal Grid WearRemain In-Service 222123c030.73PCT30Horizontal Grid WearRemain In-Service 222t23c070.76PCT23Horizontal Grid WearRemain In-Service 222r23c07-0.92PCT23Horizontal Grid WearRemain In-Service 222t23c050.64PCTl8Horizontal Grid WearRemain In-Service 222123c061.07PCTl8Horizontal Grid WearRemain In-Service 222t25c030.7PCT18Horizontal Grid WearRemain In-Service 222t25c060.73PCTr8Horizontal Grid WearRemain In-Service 22344ct20.67PCT20Horizontal Grid WearRemain In-Service 22348ct2-0.84PCTt7Horizontal Grid WearRemain In-Service 223t22c030.76PCT22Horizontal Grid WearRemain In-Service

)2528ct2-0.79PCTl3Horizontal Grid WearRemain In-Service 225122c030.76PCT23Horizontal Grid WearRemain In-Service 226t23c030.6sPCT2tHorizontal Grid WearRemain In-Service 226123CM0.@PCTl9Horizontal Grid WearRemain In-Service 226t23c03-0.9sPCTl8Horizontal Grid WearRemain In-Service 226t25c030.tPCTl8Horizontal Grid WearRemain In-Service 2274c061.04PCTl5Horizontal Grid WearRemain In-Service

)27t24c030.8 rPCT2tHorizontal Grid WearRemain In-Service 227124c05-0.98PCTt9Horizontal Grid WearRemain In-Service

)28ll9c06-0.82PCT2tHorizontal Grid WearRemain In-Service 228t23c030.78PCT26Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 11 of 19 SGRowColLocnInchlIndYrTWCharacterization Resolution 2307c060.76PCTt6Horizontal Grid WearRemain In-Service 230123c060.84PCT27Horizontal Grid WearRemain In-Service 230t23c07-0.86PCT27Horizontal Grid WearRemain In-Service 230t23c030.73PCT26Horizontal Grid WearRemain In-Service 230t23c05-0.89PCT23Horizontal Grid WearRemain In-Service 230123c06-0.84PCT20Horizontal Grid WearRemain In-Service 230123c040.65PCTl8Horizontal Grid WearRemain In-Service 23r54ct21.03PCT22Horizontal Grid WearRemain In-Service 232t2tc030.73PCTt9Horizontal Grid WearRemain In-Service 232t2tc05-0.93PCTl8Horizontal Grid WearRemain In-Service 233t22c03-0.9PCTl9Horizontal Grid WearRemain In-Service 233122c040.73PCTl8Horizontal Grid WearRemain In-Service 233122c070.s3PCTl8Horizontal Grid WearRemain In-Service 2367c06-0.84PCTl8Horizontal Grid WearRemain In-Service 236t2tc03-0.92PCT20Horizontal Grid WearRemain In-Service 2378c030.75PCTl8Horizontal Grid WearRemain In-Service 2387c030.94PCTt6Horizontal Grid WearRemain In-Service 2398c071.07PCTt5Horizontal Grid WearRemain In-Service 247l0c030.88PCTt9Horizontal Grid WearRemain In-Service 2509c04-0.9PCTl9Horizontal Grid WearRemain In-Service 25lll8c03-0.98PCTl8Horizontal Grid WearRemain In-Service 253I l8c03-0.89PCT2tHorizontal Grid WearRemain In-Service 2s9tt4c040.62PCTl5Horizontal Grid WearRemain In-Service 260I 15c03-0.96PCTl9Horizontal Grid WearRemain In-Service 260ll5c06l.t2PCTl9Horizontal Grid WearRemain In-Service 260I l5c07l.0rPCTl7Horizontal Grid WearRemain In-Service 262l5c0s0.67PCTl9Horizontal Grid WearRemain In-Service 262t5c041.03PCTl7Horizontal Grid WearRemain In-Service 262ll3c07-0.98PCT25Horizontal Grid WearRemain In-Service 262ll3c03-0.95PCTl8Horizontal Grid WearRemain In-Service 262n3c040.62PCTl8Horizontal Grid WearRemain In-Service 263tt4c031.04PCTt7Horizontal Grid WearRemain In-Service 263tt4c060.64PCTl5Horizontal Grid WearRemain In-Service 264l13c03-0.87PCTt7Horizontal Grid WearRemain In-Service 27lll0c050.65PCTt6Horizontal Grid WearRemain In-Service 272109c03-t.2PCT20Horizontal Grid WearRemain In-Service 276107c030.65PCTl6Horizontal Grid WearRemain In-Service 277104c03-0.76PCTt9Horizontal Grid WearRemain In-Service 277104c04I .01PCTl8Horizontal Grid WearRemain In-Service 278105c03-0.82PCTl8Horizontal Grid WearRemain In-Service 279IMc031.04PCTl8Horizontal Grid WearRemain In-Service 279104c04-0.96PCTt7Horizontal Grid WearRemain In-Service 280103c06-0.9sPCTl9Horizontal Grid WearRemain In-Service 283100c040.54PCT20Horizontal Grid WearRemain In-Service 285100c06-0.99PCT2tHorizontal Grid WearRemain In-Service 285r00c040.65PCTl9Horizontal Grid WearRemain In-Service 285100c071.22PCTl8Horizontal Grid WearRemain In-Service 28697c040.89PCTl8Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 12 of 19 SGRowColLocnInchlInd%TWCharacterization Resolution 28697c030.68PCTl7Horizontal Grid WearRemain In-Service 28699c040.7PCT22Horizontal Grid WearRemain In-Service 28730c030.74PCTl8Horizontal Grid WearRemain In-Service 28732c061.72PCTt9Horizontal Grid WearRemain In-Service 28794c040.73PCT20Horizontal Grid WearRemain In-Service 28798c06-0.95PCT30Horizontal Grid WearRemain In-Service 28798c03-0.9sPCT23Horizontal Grid WearRemain In-Service 28798c040.67PCTl9Horizontal Grid WearRemain In-Service 28895c031.04PCT37Horizontal Grid WearRemain In-Service 28895c030.53PCTt6Horizontal Grid WearRemain In-Service 28895c060.78PCTl6Horizontal Grid WearRemain In-Service 28932c03-0.94PCTt9Horizontal Grid WearRemain In-Service 28932c030.82PCTl6Horizontal Grid WearRemain In-Senrice 28994c03-0.98PCT25Horizontal Grid WearRemain In-Service 28996c061.04PCTt7Horizontal Grid WearRemain In-Service 29095c040.73PCT23Horizontal Grid WearRemain In-Service 29095c07-0.95PCTl8Horizontal Grid WearRemain In-Service 29t94c03-0.92PCT25Horizontal Grid WearRemain In-Service 29235c04-0.86PCTl7Horizontal Grid WearRemain In-Service 29235c03-0.92PCTl6Horizontal Grid WearRemain In-Service 29293c07-0.87PCTl9Horizontal Grid WearRemain In-Service 29293c040.73PCTl8Horizontal Grid WearRemain In-Service 29293c06-0.88PCTl8Horizontal Grid WearRemain In-Service 29582c03l.l5PCTl7Horizontal Grid WearRemain In-Service 29685c060.89PCTt9Horizontal Grid WearRemain In-Service 29685c071.06PCTt7Horizontal Grid WearRemain In-Service 29687c03-0.82PCTt8Horizontal Grid WearRemain In-Service 29786c03t.t2PCTl9Horizontal Grid WearRemain In-Service

)9788c03-0.96PCT20Horizontal Grid WearRemain In-Service 29843c050.71PCT20Horizontal Grid WearRemain In-Service 29879c03t.t2PCTl9Horizontal Grid WearRemain In-Service 29883c03l.l8PCTl8Horizontal Grid WearRemain In-Service 29984c020.62PCTl6Horizontal Grid WearRemain In-Service 21008lc040.78PCT23Horizontal Grid WearRemain In-Service 2l0l78c03l.l5PCT20Horizontal Grid WearRemain In-Service 2l0l80c031.2PCT20Horizontal Grid WearRemain In-Service 210362c030.92PCTt7Horizontal Grid WearRemain In-Service 210366c050.67PCT22Horizontal Grid WearRemain In-Service 210374c03l.l5PCTl9Horizontal Grid WearRemain In-Service 21046lc06-0.9PCTl6Horizontal Grid WearRemain In-Service 210469c050.7PCTt9Horizontal Grid WearRemain In-Service 210566c030.72PCT23Horizontal Grid WearRemain In-Service 210566c050.67PCTt7Horizontal Grid WearRemain In-Service 210568c030.75PCT20Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 13 of 19 Table2-72 Watts Bar U1R14 Horimntal Tube Suooort Grid Wear Indications

- SG 3able 2-72 Watts Bar UlRl4 Horizontal Tube Suear tnotcauons

-SGRowColLocnInchlInd%TWCharacterization Resolution 3I72H04-0.88PCTl5Horizontal Grid WearRemain In-Service 3I72H05-0.96PCTt4Horizontal Grid WearRemain In-Service 3I72H040.91PCTl3Horizontal Grid WearRemain In-Service 3I78H04-0.9rPCT20Horizontal Grid WearRemain In-Service 3I86H04-0.85PCTl5Horizontal Grid WearRemain In-Service 372c030.83PCTt6Horizontal Grid WearRemain In-Service 39r06c06-0.78PCTl8Horizontal Grid WearRemain In-Service 3l0Ic030.72PCT23Horizontal Grid WearRemain In-Service 3l0Ic05-0.92PCTt7Horizontal Grid WearRemain In-Service 3l34c030.75PCTl8Horizontal Grid WearRemain In-Service 3t45lHl00.68PCTl8Horizontal Grid WearRemain In-Service 3t45lclt1.06PCTt7Horizontal Grid WearRemain In-Senrice 3t48rH06-0.9PCTt8Horizontal Grid WearRemain In-Service 3l52c04-0.97PCT20Horizontal Grid WearRemain In-Service 3l52c030.83PCTt7Horizontal Grid WearRemain In-Service 3l54c06-0.91PCTl9Horizontal Grid WearRemain In-Service 3t7102ct21.06PCT20Horizontal Grid WearRemain In-Service 3t7t02cl20.66PCTl8Horizontal Grid WearRemain In-Service 3l853ct2-0.89PCTt7Horizontal Grid WearRemain In-Service 3l92c04-0.98PCT23Horizontal Grid WearRemain In-Service 3206tcl0-0.98PCTl9Horizontal Grid WearRemain In-Service 323t24c060.69PCT23Horizontal Grid WearRemain In-Service 3243c050.8PCTl8Horizontal Grid WearRemain In-Service 3265c03-0.8PCTl8Horizontal Grid WearRemain In-Service 328I l9ct2-0.86PCTl8Horizontal Grid WearRemain In-Service 3325c03-0.89PCTl8Horizontal Grid WearRemain In-Service 3345c03IPCT20Horizontal Grid WearRemain In-Service 353r r8c060.69PCTl6Horizontal Grid WearRemain In-Service 359t4c031.03PCT2tHorizontal Grid WearRemain In-Service 36ttt4c060.83PCT26Horizontal Grid WearRemain In-Service 36ltt4c06-0.75PCTt7Horizontal Grid WearRemain In-Service 364l7c03-0.89PCTl6Horizontal Grid WearRemain In-Service 364lllc04-0.77PCTl8Horizontal Grid WearRemain In-Service 364lllc07IPCTt4Horizontal Grid WearRemain In-Service 365l8c03-0.98PCTl8Horizontal Grid WearRemain In-Service 367n2c06l.l IPCTt6Horizontal Grid WearRemain In-Service 368t9c030.63PCTl8Horizontal Grid WearRemain In-Service 37lr04c030.87PCTl7Horizontal Grid WearRemain In-Service 376t07c040.75PCT2tHorizontal Grid WearRemain In-Service 376t07c060.8PCT20Horizontal Grid WearRemain In-Service 37722c030.72PCTl6Horizontal Grid WearRemain In-Service 37924c030.75PCTl8Horizontal Grid WearRemain In-Service 38225c030.69PCTt6Horizontal Grid WearRemain In-Service 38227c030.67PCTl6Horizontal Grid WearRemain In-Service 38326c030.95PCTl5Horizontal Grid WearRemain In-Service 38429c030.72PCT20Horizontal Grid WearRemain In-Senrice 38495c050.91PCTl6Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 14 of 19 SGRowColLocnInchlIndo/oTWCharacterization Resolution 38499c03-0.92PCTt7Horizontal Grid WearRemain In-Service 38528c030.7sPCT2tHorizontal Grid WearRemain In-Service 38596c030.8PCTl8Horizontal Grid WearRemain In-Service 38598c02-0.94PCT22Horizontal Grid WearRemain In-Service 3863lc030.66PCTt7Horizontal Grid WearRemain In-Service 38695c030.7 lPCT20Horizontal Grid WearRemain In-Service 38697c02-0.82PCT22Horizontal Grid WearRemain In-Service 38699c050.74PCT22Horizontal Grid WearRemain In-Service 38699c02-0.85PCT2tHorizontal Grid WearRemain In-Service 38699c040.62PCTl8Horizontal Grid WearRemain In-Service 38699c03-0.89PCTt7Horizontal Grid WearRemain In-Service 38932c030.69PCTl8Horizontal Grid WearRemain In-Service 38996c03-0.92PCT22Horizontal Grid WearRemain In-Servrce 39033c030.66PCT2tHorizontal Grid WearRemain In-Service 39093c04-0.97PCTl5Horizontal Grid WearRemain In-Service 39095c04-0.8sPCTt8Horizontal Grid WearRemain In-Service 39095c03-0.8PCTl7Horizontal Grid WearRemain In-Service 39t34c03-0.92PCT25Horizontal Grid WearRemain In-Service 39235c03-0.98PCT25Horizontal Grid WearRemain In-Service 3929lc03-0.83PCTl9Horizontal Grid WearRemain In-Service 3929lc0s-0.95PCTt6Horizontal Grid WearRemain In-Service 39293c04-0.98PCTt7Horizontal Grid WearRemain In-Service 39336c03-0.89PCTl8Horizontal Grid WearRemain In-Service 39336c040.69PCT18Horizontal Grid WearRemain In-Service 39390c030.8PCTl9Horizontal Grid WearRemain In-Service 39437c06-0.92PCTt9Horizontal Grid WearRemain In-Service 3944tc07t.t2PCT21Horizontal Grid WearRemain In-Service 39489c03-0.92PCTl8Horizontal Grid WearRemain In-Service 39538c02-0.77PCTl9Horizontal Grid WearRemain In-Service 39538c040.69PCTt7Horizontal Grid WearRemain In-Service 39685c060.79PCT19Horizontal Grid WearRemain In-Service 39740c040.72PCTt6Horizontal Grid WearRemain In-Service 39742c040.69PCT26Horizontal Grid WearRemain In-Service 39742c060.86PCTt6Horizontal Grid WearRemain In-Service 310075c030.72PCTl8Horizontal Grid WearRemain In-Service 3t0l68c030.8PCT2lHorizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 15 of 19 2-8wtts BaU1Rl4HarUZOtalTbe SuSG-SGMP-17-20 Revision 0aDte l-IJi warfs lrar ull(rlt rlonuSGRowColLocnInchlIndo/oTWCharacterization Resolution 4342cil-0.96PCT23Horizontal Grid WearRemain In-Service 4342ct21.09PCTl9Horizontal Grid WearRemain In-Service 4637cllI .01PCTt7Horizontal Grid WearRemain In-Service 4673H07-0.87PCT2lHorizontal Grid WearRemain In-Service 46127c030.76PCT23Horizontal Grid WearRemain In-Service 4940cll-0.96PCTt7Horizontal Grid WearRemain In-Service 4942H060.62PCT24Horizontal Grid WearRemain In-Service 4942H070.72PCTt7Horizontal Grid WearRemain In-Service 4l04tc09-0.87PCTt9Horizontal Grid WearRemain In-Service 4l06lH07t.t2PCTl8Horizontal Grid WearRemain In-Service 4t27lH06-0.86PCT22Horizontal Grid WearRemain ln-Service 4t27lH07-t.23PCT22Horizontal Grid WearRemain In-Service 4l378cl00.64PCT3lHorizontal Grid WearRemain In-Service 4t43c040.69PCT20Horizontal Grid WearRemain In-Service 4r863ct20.61PCT23Horizontal Grid WearRemain In-Service 4l863cll0.64PCT2tHorizontal Grid WearRemain In-Service 422123c03l.lPCTl8Horizontal Grid WearRemain In-Service 423t24c03-0.88PCT2tHorizontal Grid WearRemain In-Service 423r24c06-0.84PCT2tHorizontal Grid WearRemain In-Service 4249lH06-0.22PCTt9Horizontal Grid WearRemain In-Service 424125c030.87PCT24Horizontal Grid WearRemain In-Service 424t25c060.75PCTl8Horizontal Grid WearRemain In-Service 42562cll0.67PCT20Horizontal Grid WearRemain In-Service 4263sct2-0.92PCTt7Horizontal Grid WearRemain In-Service 426t23c040.7 6PCT2tHorizontal Grid WearRemain In-Service 426123c08-0.93PCTl9Horizontal Grid WearRemain In-Service 426123c03-0.9PCTl8Horizontal Grid WearRemain In-Service 427124c03-0.93PCT23Horizontal Grid WearRemain In-Service 428123c04-0.87PCT20Horizontal Grid WearRemain In-Service 4305c05-0.78PCTl8Horizontal Grid WearRemain In-Service 43l124c03-0.93PCT20Horizontal Grid WearRemain In-Service 4325c020.76PCTt7Horizontal Grid WearRemain In-Service 4327c020.82PCT20Horizontal Grid WearRemain In-Service 4327c030.73PCTl8Horizontal Grid WearRemain In-Service 4338c030.94PCTl8Horizontal Grid WearRemain In-Service 43st22c030.97PCT20Horizontal Grid WearRemain In-Service 4438c040.98PCTl9Horizontal Grid WearRemain In-Service 4449c06-0.7PCTl8Horizontal Grid WearRemain In-Service 444t2tc03IPCT22Horizontal Grid WearRemain In-Service 4458c03-0.82PCTr8Horizontal Grid WearRemain In-Service 449il0ct2-0.48PCTl8Horizontal Grid WearRemain In-Service 45087H0l-t.22PCTl9Horizontal Grid WearRemain In-Service 453r l8c02-0.87PCT2lHorizontal Grid WearRemain In-Service 460I 15c070.9PCT18Horizontal Grid WearRemain In-Service 463tt4c06l.l IPCT2lHorizontal Grid WearRemain In-Service 46stt2c05-0.84PCTt9Horizontal Grid VlearRemain In-Servrce 47t108c060.73PCTt6Horizontal Grid WearRemain In-Service rt Grid Wear Indications

- SG 4June 2017Page 16 of 19 SGRowColLocnInchlIndo/oTWCharacterization Resolution 477104c030.71PCT26Horizontal Grid WearRemain In-Service 478103c030.8PCTt8Horizontal Grid WearRemain In-Service 48398c030.71PCTl8Horizontal Grid WearRemain In-Service 48398c04-0.9PCTt6Horizontal Grid WearRemain In-Service 483100c030.72PCT20Horizontal Grid WearRemain In-Service 48497c04-0.94PCT20Horizontal Grid WearRemain In-Service 48497c030.74PCTl9Horizontal Grid WearRemain In-Service 484l0lc04-0.94PCT22Horizontal Grid WearRemain In-Service 484l0lc030.71PCT2tHorizontal Grid WearRemain In-Senrice 484l0rc020.68PCT20Horizontal Grid WearRemain In-Service 484l0lc06-0.91PCTl8Horizontal Grid WearRemain In-Service 48528c03-0.86PCT22Horizontal Grid WearRemain In-Service 48594c03-0.84PCT20Horizontal Grid WearRemain In-Service 48596c04-0.95PCTt8Horizontal Grid WearRemain In-Service 485100c04-0.86PCT20Horizontal Grid WearRemain In-Service 48792CM0.78PCTr9Horizontal Grid WearRemain In-Service 48796c03-0.89PCT24Horizontal Grid WearRemain In-Service 48796c05-0.72PCTt9Horizontal Grid WearRemain In-Service 48798c04-0.89PCT20Horizontal Grid WearRemain In-Service 4883lc03-0.95PCT22Horizontal Grid WearRemain In-Service 48895c03-0.75PCTt7Horizontal Grid WearRemain In-Service 48994c0s0.66PCTt7Horizontal Grid WearRemain In-Service 48996c03-0.89PCT23Horizontal Grid WearRemain In-Service 48996c050.7 lPCTl8Horizontal Grid WearRemain In-Service 49035c03I .18PCTl9Horizontal Grid WearRemain In-Service 49039c040.88PCTl7Horizontal Grid WearRemain In-Service 4909lc04-0.92PCTl8Horizontal Grid WearRemain In-Service 49l34c03-0.89PCT24Horizontal Grid WearRemain In-Service 49t34c050.74PCT20Horizontal Grid WearRemain In-Service 49l36c040.7 tPCT22Horizontal Grid WearRemain In-Service 49l36c03-t.2PCT2lHorizontal Grid WearRemain In-Service 49l38c03-0.92PCT22Horizontal Grid WearRemain In-Service 49l92c04-0.8PCT20Horizontal Grid WearRemain In-Service 49l94c030.71PCT23Horizontal Grid WearRemain In-Service 49237c03-0.86PCT25Horizontal Grid WearRemain In-Service 4929lc030.65PCTt7Horizontal Grid WearRemain In-Service 49293c030.74PCT20Horizontal Grid WearRemain In-Service 49336c03-0.t 4PCT22Horizontal Grid WearRemain In-Service 49336c050.68PCT2tHorizontal Grid WearRemain In-Service 49437c03t.l7PCT34Horizontal Grid WearRemain In-Service 49439c03-0.86PCT22Horizontal Grid WearRemain In-Service 49439c07-0.92PCTl8Horizontal Grid WearRemain In-Service 4944lc03-0.92PCT23Horizontal Grid WearRemain In-Service 49540c0s0.71PCTl9Horizontal Grid WearRemain In-Service 49540c061.03PCTl8Horizontal Grid WearRemain In-Service 49542c03-0.83PCT26Horizontal Grid WearRemain In-Service 49586c030.68PCT24Horizontal Grid WearRemain In-Service 4964tc030.7 lPCT22Horizontal Grid WearRemain In-Service SG-SGMP-17-20 Revision 0June 2017Page 17 of 19 SGRowColLocnInchlInd%TWCharacterization Resolution 4964lc0s-0.98PCTl9Horizontal Grid WearRemain In-Service 49643c03-0.95PCTl9Horizontal Grid WearRemain In-Service 49645c03-0.92PCT2lHorizontal Grid WearRemain In-Service 4968lc030.92PCTl8Horizontal Grid WearRemain In-Service 49742c0s-0.97PCT22Horizontal Grid WearRemain In-Service 49778c030.8 rPCT2lHorizontal Grid WearRemain In-Service 49786c030.74PCT25Horizontal Grid WearRemain In-Service 49788c030.8PCT2tHorizontal Grid WearRemain In-Service 49788c03-0.74PCT18Horizontal Grid V/earRemain In-Service 49788c07-0.86PCT18Horizontal Grid WearRemain In-Service 49843c070.77PCTl9Horizontal Grid WearRemain In-Service 49843c03-0.95PCTl8Horizontal Grid WearRemain In-Service 49845c03-0.94PCT30Horizontal Grid WearRemain In-Service 4988lc030.59PCTl8Horizontal Grid WearRemain In-Service 49885c030.7 lPCT23Horizontal Grid WearRemain In-Service 4994c030.88PCTt9Horizontal Grid WearRemain In-Service 49944c060.79PCTt7Horizontal Grid WearRemain In-Service 49944c080.71PCTl7Horizontal Grid WearRemain In-Service 49946c03-0.89PCT22Horizontal Grid WearRemain In-Service 41008rc030.7PCTl8Horizontal Grid WearRemain In-Service 410083c03-0.86PCT2tHorizontal Grid WearRemain In-Service 410083c07t.t7PCTl8Horizontal Grid WearRemain In-Service 4l0t80c030.7PCT20Horizontal Grid WearRemain In-Service 4t0249c030.8PCT2lHorizontal Grid WearRemain In-Service 4r025lc040.78PCTl9Horizontal Grid WearRemain In-Service 4t0279c030.73PCTl9Horizontal Grid WearRemain In-Service 410376c030.67PCT2tHorizontal Grid WearRemain In-Service 41047lc03-0.9PCT23Horizontal Grid WearRemain 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 theUlRl4 outage as well as the percentage of tubes currently plugged.Table 2-92 Number of Tubes Plugged for Each Degradation Mechanism sclrscr2SG13SG14TotalPlugged Tubes prior to UlRl4357t429Plugged for U-bend Support Structure Wear00000Plugged for Horizontal Grid Wear00000Total Plugged to Date357t429Percentage Plugged to Date0.06%0.t0%0.r4%0.274/0a.r4%SG-SGMP-17-20 Revision 0June 2017Page l8 of 19

f. Total Number and Percentage of Tubes Plugged to DateTable 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-SituTestingTube Inteerity A condition monitoring (CM) assessment was performed as required by the WBNI steamgenerator progfam.

The only tube degradation detected during the U1Rl4 inspection was wear attube support structures.

The deepest indication had an estimated depth of 37%Ttl from thebobbin probe exam and was located at a horizontal support grid. Conservatively assuming anenveloping flaw length slightly greater than the width of the support (2.0 inches),

the CM limitfor horizontal support grid wear is 52%TW. This CM limit includes uncertainties for materialproperties, NDE depth sizing, and the burst pressure relationship.

Since the deepest flaw has anestimated 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 wasdemonstrated analytically, in-sitr,r pressure testing was not required nor perfonned during theUlRl4 outage. No tube pulls were planned or performed during UlRl4.Visual Insoection ResultsVisual 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 wellas 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 visualinspections of the channel head bowl cladding and the divider plate showed no visually apparentevidence 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 removedas 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 thehot leg and cold leg annulus and center no tube lane. A total of 6 foreign objects were removedfrom the top of the tubesheet region and 6 objects remain on the secondary side among the fourSGs. The foreign objects remaining are all small pieces of metal, wires, and bristles.

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

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

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