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 CommissionWashington, D.C. 20555-0001Watts 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 Generatorlnspection 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 performedin 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 questionsWBN Site Licensing, at 423-365-3173.Pau! SimmonsSite Vice PresidentWatts Bar Nuclear Plant

Enclosure:

Watts Bar U1R14 180 Day Steam GeneratorTube Inspection Reportcc: See Page 2 U.S. Nuclear Regulatory CommissionPage 2July 28,2017Enclosurescc (Enclosures):NRC Regional Administrator - Region llNRC Project Manager - Watts Bar Nuclear Plant, Unit 1NRC Senior Resident lnspector - Watts Bar Nuclear Plant, Unit 1 EnclosureWatts Bar UlR14 180 Day Steam Generator Tube lnspection Report WTSTTNGHOUSE NON-PnoprueTARY CIess 3SCr-SGMP-17-20Revision 0June 2017Watts Bar U1R14180 Day Steam GeneratorTUbe Inspection Report WESTINGHOUSE NON-PROPRIETARY CLASS 3SCr-SGMP-17-20Revision 0Waffs Bar U1R14180 Day Steam GeneratorTube Inspection ReportPrepared for:Tennessee Valley AuthorityAuthor'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 SGPrograrnManagerReviewer'sNnmelTarnmy 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-17-20Revision 0June 2017Page 2 of 19 Record of RevisionsRevisionDateDescription0aJune2017Preliminary draft for Tennessee Valley Authority review and corrment.0SeeEMDSOriginal IssueSG-SGMP-17-20Revision 0June 2017Page 3 of 19 Table of Contents2.0 180 Day Steam Generator Tube lnspection Report ..........6The Scope of the Inspections Performed on Each SG............. ...............6Active Degradation Mechanisms Found...... ........................6Nondestructive Examination (NDE) Techniques Used for Each Degradation Mechanism..........6Location, Orientation (if Linear), and Measured Sizes (if Available) of Service lnducedIndications. ..................7Number of Tubes Plugged During the Inspection Outage for Each Active DegradationMechanism ................18Total Number and Percentage of Tubes Plugged to Date ..................... 19The Results of Condition Monitoring, Including the Results of Tube Pulls and In-Situ TestinglgThe 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......... .....................6Table2-2: Number of lndications Detected for Each Degradation Mechanism ............6Table 2-3: NDE Techniques for Each Existing or Potential Degradation Mechanism............. ........7Table 24: Watts Bar UlRl4 U-bend Support Stnrcture Wear Indications - All SGs ............ ..........7Table 2-5: Watts Bar UlR14 Horizontal Tube Support Grid Wear Indications - SG 1........... .........9Table2-9: Number of Tubes Plugged for Each Degradation Mechanism ...................18a.b.c.d.e.f.oD.h.SG-SGMP-17-20Revision 0Jnne 2017Page 4 of 19 1.0IntroductionInspections 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 inspectionof 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 RECIRCULATINGTNTRANCTCROSS TLOWHOT SIDERECIRCULATINOENTRANCTCROSS TLOWFigure 1-1: Tube Support Arrangement for Watts Bar Unit I Model68AXP Replacement Steam GeneratorsNotes: 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-17-20Revision 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 documentsthe scope and results of the UlR14 SG inspections. There are eight specific reporting requirementsassociated 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 restrictionsin 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 installedtube 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 determiningthe 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 MechanismDegradation Mechanismscl1sG12sG13SGl4TotalU-bend Support Stmcnre Wearl3lt23t259Horizontal Tube Support Grid Wear7413983t23419c. Nondestructive Examination (NDE) Techniques Used for Each Degradation MechanismTable 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-17-20Revision 0Jtrne 2017Page 6 of 19 Table 2-3: I\DE Techniques for Each Existing or Potential Degradation MechanismDegradation MechanismDetection TechniqueEPRI ETSSU-BendSupport Stmcture WearBobbinArrayArrayArrayArray96004.1, Revision l3I 1956. l, Revision 211956.2, Revision 2I 1956.3, Revision 211956.4. Revision2HorizontalTube Support Grid WearBobbinArrayArrayArrayArray96004.1, Revision l3I 1956.1, Revision 211956.2, Revision2I1956.3, Revision211956.4. Revision2Foreign Object WearBobbinArrayArrayArrayArray27091.2, Revision 2I 1956.1, Revision 211956.2, Revision 2I1956.3, Revision 211956.4. Revision2Tube-to-Tube WearBobbin96010.1, RevisionTd. Location, Orientation (if Linear), and Measured Sizes (if Available) of Service InducedIndicationsTable 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 SGsSGRowColLocnInchlIndYuTWCharacterizationResolutionI5374VS4l. t5PCTl5U-bend Support Stnrcnre WearRemain In-ServiceI5847VS31.29PCTl6U-bend Support Structure WearRemain In-ServiceI5847VS3-0.96PCTl6U-bend Support Structure WearRemain In-ServiceI6665V540.86PCTr9U-bend Support Structure WearRemain In-ServiceI7756VS3-0.9rPCTl8U-bend Support Structure WearRemain In-ServiceI7782VS3t.t2PCTt7U-bend Support Stnrcture WearRemain In-SenriceI8283VS4I.0rPCTt8U-bend Support Structure WearRemain In-ServiceI9558VS2-0.61PCTl5U-bend Support Structure WearRemain In-ServiceI10568DS20.62PCT2tU-bend Support Stnrcture WearRemain In-ServiceI10568VS2-0.03PCTl9U-bend Support Stnrcture WearRemain In-ServiceI10568VS2-0.72PCTl8U-bend Support Structure WearRemain In-ServiceIr0568VS41.03PCTl7U-bend Support Stnrcture WearRemain In-ServiceI10568DS2-0.23PCTl5U-bend Support Structure WearRemain In-Service26598VS2t.24PCTt7U-bend Support Structure WearRemain In-Service26796VS21.05PCTt4U-bend Support Structure WearRemain In-Service27554VS40.86PCT22U-bend Support Structure WearRemain In-Service29067VS4-0.76PCTl8U-bend Support Stnrcture WearRemain In-Service29067VS2-0.85PCTt2U-bend Support Stnrcture WearRemain In-Service29l58vs20.8PCT20U-bend Support Stnrcture WearRemain In-Service29663VS3-0.64PCT22U-bend Support Stnrcture WearRemain In-Service299s8VS40.8PCTl8U-bend Support Stmcture WearRemain In-Service2r0063VS2-0.75PCT24U-bend Support Stnrcture WearRemain In-Service210063VS20.55PCTl8U-bend Support Stnrcture WearRemain In-Service2l0l52vst-0.93PCTt3U-bend Support Stnrcture WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 7 of 19 SGRowColLocnInchlIndo/oTWCharacterizationResolution '32469DS4-0.03PCT23U-bend Support Stnrcture WearRemain In-Service34378VS31.2PCTt6U-bend Support Stnrcture WearRemain In-Service35085vs3-0.38PCT20U-bend Support Structure WearRemain In-Service35382VS3-0.12PCTt9U-bend Support Structure WearRemain In-Service36382VS31.35PCTt7U-bend Support Stnrcture WearRemain In-Service3&8lVS31.82PCTl7U-bend Support Stnrcture WearRemain In-Service38l56VS40.89PCT27U-bend Support Structure WearRemain In-Service38243VS2-0.95PCTl8U-bend Support Structure WearRemain In-Service39667VS2-0.78PCTl6U-bend Support Structure WearRemain In-Service39756VS30.74PCT20U-bend Support Structure WearRemain In-Service39756VS3t.2lPCTl9U-bend Support Stnrcture WearRemain In-Service397@DS3-0.83PCTt9U-bend Support Structure WearRemain In-Service3987lVS40.t3PCT20U-bend Support Stnrcture WearRemain In-Service39950DS30.82PCTl8U-bend Support Structure WearRemain In-Service39958VS40.96PCT2tU-bend Support Structure WearRemain In-Service399s8V340.03PCTl7U-bend Support Structure WearRemain In-Service3r0055VS2-0.75PCT20U-bend Support Stnrcture WearRemain In-Service310063DS30.8PCTt7U-bend Support Structure WearRemain In-Service310067DS30.7 5PCTl8U-bend Support Stnrcture WearRemain In-Service3r0l58DS2-0.8PCT2tU-bend Support Stnrcture WearRemain In-Service3l0l58VS40.84PCTt9U-bend Support Structure WearRemain In-Service3l0l58VS3-0.31PCTt7U-bend Support Structure WearRemain In-Service310273VSI-0.91PCTl9U-bend Support Stmcture WearRemain In-Service4928lVS20.9PCT23U-bend Support Structure WearRemain In-Service49370VS20.92PCT19U-bend Support Stnrcture WearRemain In-Service49370VS20.06PCTl8U-bend Support Stnrcture WearRemain In-Service49370VS2-0.82PCTl8U-bend Support Structure WearRemain In-Service49380vs20.96PCT2tU-bend Support Structure WearRemain In-Service49380vs20.2PCTt7U-bend Support Stnrcture WearRemain In-Service49683DS2-0.83PCT20U-bend Support Structure WearRemain In-Service49772VS3-0.24PCTl8U-bend Support Stmcture WearRemain In-Service49847VS20.82PCTl5U-bend Support Structure WearRemain In-Service4l0l70VS30.61PCTt9U-bend Support Structure WearRemain In-Service410257VS3t.t4PCT22U-bend Support Stnrcture WearRemain In-Service410257DS2-0.76PCT2tU-bend Support Structure WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 8 of 19 Table 2-5: Watts Bar U1R14 Ilorizontal Tube Support Grid Wear Indications - SG ISGRowColLocnInchlInd(%rwCharacterizationResolutionII48H041.06PCTl8Horizontal Grid WearRemain In-ServiceII48H070. l9PCTl7Horizontal Grid WearRemain In-ServiceIII l6c04-0.88PCTl8Horizontal Grid WearRemain In-Service1764H090.66PCTt9Horizontal Grid WearRemain In-ServiceI788H06-0.97PCT22Horizontal Grid WearRemain In-ServiceI7102H080.63PCTl8Horizontal Grid WearRemain In-ServiceI899H091.06PCTt9Horizontal Grid WearRemain In-ServiceI8tztc05-0.67PCTl7Horizontal Grid WearRemain In-ServiceI9100cl0-0.87PCTt9Horizontal Grid WearRemain In-ServiceI9100cll0.76PCTl8Horizontal Grid WearRemain In-ServiceI9104H07-0.92PCT22Horizontal Grid WearRemain In-ServiceIl8103H07-0.92PCT20Horizontal Grid WearRemain In-ServiceI2384clr0.78PCTl9Horizontal Grid WearRemain In-ServiceI26t23c06-0.7PCTr9Horizontal Grid WearRemain In-ServiceI27124c06-0.84PCT20Horizontal Grid WearRemain In-ServiceI2845clr0.67PCTt9Horizontal Grid WearRemain In-ServiceI29t24c060.77PCT20Horizontal Grid WearRemain In-ServiceI29t24c0s-0.9PCTt7Horizontal Grid WearRemain In-ServiceI34t23c05-0.87PCTt9Horizontal Grid WearRemain In-ServiceI59n2c06-0.67PCTt7Horizontal Grid WearRemain In-ServiceI60ll5c0s-0.67PCTl8Horizontal Grid WearRemain In-ServiceI67tt2c060.83PCTt9Horizontal Grid WearRemain In-ServiceI68lllc060.75PCTl8Horizontal Grid WearRemain In-ServiceI7lll0c060.81PCTt9Horizontal Grid WearRemain In-ServiceI76t07c060.62PCT22Horizontal Grid WearRemain In-ServiceI77106c060.72PCTl8Horizontal Grid WearRemain In-ServiceI79104c03-0,84PCTt7Horizontal Grid WearRemain In-ServiceI82103c04-0.7 4PCTl5Horizontal Grid WearRemain In-ServiceI8326c030.73PCTl9Horizontal Grid WearRemain In-ServiceI83r02c03-0.76PCTl9Horizontal Grid WearRemain In-ServiceI83t02c060.67PCTl7Horizontal Grid WearRemain In-ServiceI8499c040.75PCT22Horizontal Grid WearRemain In-ServiceI8499c03-0.76PCTl9Horizontal Grid WearRemain In-ServiceI8499c07IPCTl8Horizontal Grid WearRemain In-ServiceI8530c030.73PCT2lHorizontal Grid WearRemain In-ServiceI8594c03IPCTl8Horizontal Grid WearRemain In-ServiceI8598c040.81PCTl8Horizontal Grid WearRemain In-ServiceI85100c03-0.79PCT27Horizontal Grid WearRemain In-ServiceI8697c040.56PCTt7Horizontal Grid WearRemain In-ServiceI8699c03-0.9PCTl8Horizontal Grid WearRemain In-Service18730c020.73PCT2lHorizontal Grid WearRemain In-ServiceI8796c04-0.87PCTl9Horizontal Grid WearRemain In-Service18798c030.76PCT2lHorizontal Grid WearRemain In-ServiceI883lc030.78PCTt7Horizontal Grid WearRemain In-ServiceI8895c03-0.87PCT22Horizontal Grid WearRemain In-ServiceI8897c030.78PCT2tHorizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 9 of 19 I8994c040.73PCTl8Horizontal Grid WearRemain In-ServiceI8996c03-0.t9PCT33Horizontal Grid WearRemain In-ServiceI9093c03-0.75PCT20Horizontal Grid WearRemain In-ServiceI9095c040.59PCT22Horizontal Grid WearRemain In-ServiceI9095c03-0.78PCT2tHorizontal Grid WearRemain In-ServiceI9l90c04-0.98PCTt9Horizontal Grid WearRemain In-ServiceI9l92c03-0.9PCTl9Horizontal Grid WearRemain In-ServiceI9l94c060.64PCT20Horizontal Grid WearRemain In-ServiceI929lc03-0.9PCTl8Horizontal Grid WearRemain In-ServiceI9293c03-0.79PCT24Horizontal Grid WearRemain In-ServiceI9588c030.7 5PCT22Horizontal Grid WearRemain In-ServiceI9689c03-0.93PCTl8Horizontal Grid WearRemain In-ServiceI9784c070.78PCT2tHorizontal Grid WearRemain In-ServiceI9784c03-0.79PCT20Horizontal Grid WearRemain In-ServiceI9885c05-0.92PCT22Horizontal Grid WearRemain In-ServiceI9885c030.73PCT20Horizontal Grid WearRemain In-ServiceI10083c05-0.95PCT23Horizontal Grid WearRemain In-ServiceI10083c030.75PCT22Horizontal Grid WearRemain In-ServiceIt0l66c030.78PCTl7Horizontal Grid WearRemain In-ServiceIl0l78c03-0.95PCT20Horizontal Grid WearRemain In-ServiceI1027lc03-0.8 rPCTt7Horizontal Grid WearRemain In-Service11027lc04IPCTl6Horizontal Grid WearRemain In-ServiceI10279c030.73PCT23Horizontal Grid WearRemain In-ServiceI10354c030.9sPCTl8Horizontal Grid WearRemain In-ServiceI10374c030.95PCTl8Horizontal Grid WearRemain In-ServiceI10463c030.78PCTt8Horizontal Grid WearRemain In-ServiceI10564c05-0.92PCT22Horizontal Grid WearRemain In-ServiceI10564c030.7 5PCT20Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page l0 of 19 Table 2{: Watts Bar U1R14 Horizontal Tube Suooort Grid Wear Indications - SG 2aDte z-oz waonuear Inorcauons -SGRowColLocnInchlIndo/oTWCharacterizationResolution2I42H04-0.8PCTt6Horizontal Grid WearRemain In-Service2I44H08-0.91PCTt6Horizontal Grid WearRemain In-Service2I44H04-0.86PCTl3Horizontal Grid WearRemain In-Service2I48H040.91PCTt7Horizontal Grid WearRemain In-Service2I70H05-0.95PCTl6Horizontal Grid WearRemain In-Service2I74H04-0.6PCTl8Horizontal Grid WearRemain In-Service2231H06-0.99PCTl9Horizontal Grid WearRemain In-Service)24tH07-0.94PCTt7Horizontal Grid WearRemain In-Service2253H0s-0.72PCTl6Horizontal Grid WearRemain In-Service2269H04-0.94PCTt7Horizontal Grid WearRemain In-Service)L273H04-0.88PCTl6Horizontal Grid WearRemain In-Service22l0lH060.86PCTl7Horizontal Grid WearRemain In-Service26Ic030.81PCTl7Horizontal Grid WearRemain In-Senrice28Ic030.56PCTl8Horizontal Grid WearRemain In-Service2877H08-0.98PCT25Horizontal Grid WearRemain In-Service2877H07l.0lPCT2tHorizontal Grid WearRemain In-Service28t27c040.82PCT22Horizontal Grid WearRemain In-Service28127c030.76PCT2tHorizontal Grid WearRemain In-Service2t0t27c030.75PCT2tHorizontal Grid WearRemain In-Service2t4t23c030.92PCTt7Horizontal Grid WearRemain In-Service2l873H07r.04PCTl9Horizontal Grid WearRemain In-Service2t9124c05-0.93PCTl8Horizontal Grid WearRemain In-Service2l9t24c030,76PCTt7Horizontal Grid WearRemain In-Service2t9126c030.79PCTt7Horizontal Grid WearRemain In-Service220t23c030.86PCTl8Horizontal Grid WearRemain In-Service22tt22c091.04PCT20Horizontal Grid WearRemain In-Service222123c030.73PCT30Horizontal Grid WearRemain In-Service222t23c070.76PCT23Horizontal Grid WearRemain In-Service222r23c07-0.92PCT23Horizontal Grid WearRemain In-Service222t23c050.64PCTl8Horizontal Grid WearRemain In-Service222123c061.07PCTl8Horizontal Grid WearRemain In-Service222t25c030.7PCT18Horizontal Grid WearRemain In-Service222t25c060.73PCTr8Horizontal Grid WearRemain In-Service22344ct20.67PCT20Horizontal Grid WearRemain In-Service22348ct2-0.84PCTt7Horizontal Grid WearRemain In-Service223t22c030.76PCT22Horizontal Grid WearRemain In-Service)2528ct2-0.79PCTl3Horizontal Grid WearRemain In-Service225122c030.76PCT23Horizontal Grid WearRemain In-Service226t23c030.6sPCT2tHorizontal Grid WearRemain In-Service226123CM0.@PCTl9Horizontal Grid WearRemain In-Service226t23c03-0.9sPCTl8Horizontal Grid WearRemain In-Service226t25c030.tPCTl8Horizontal Grid WearRemain In-Service2274c061.04PCTl5Horizontal Grid WearRemain In-Service)27t24c030.8 rPCT2tHorizontal Grid WearRemain In-Service227124c05-0.98PCTt9Horizontal Grid WearRemain In-Service)28ll9c06-0.82PCT2tHorizontal Grid WearRemain In-Service228t23c030.78PCT26Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 11 of 19 SGRowColLocnInchlIndYrTWCharacterizationResolution2307c060.76PCTt6Horizontal Grid WearRemain In-Service230123c060.84PCT27Horizontal Grid WearRemain In-Service230t23c07-0.86PCT27Horizontal Grid WearRemain In-Service230t23c030.73PCT26Horizontal Grid WearRemain In-Service230t23c05-0.89PCT23Horizontal Grid WearRemain In-Service230123c06-0.84PCT20Horizontal Grid WearRemain In-Service230123c040.65PCTl8Horizontal Grid WearRemain In-Service23r54ct21.03PCT22Horizontal Grid WearRemain In-Service232t2tc030.73PCTt9Horizontal Grid WearRemain In-Service232t2tc05-0.93PCTl8Horizontal Grid WearRemain In-Service233t22c03-0.9PCTl9Horizontal Grid WearRemain In-Service233122c040.73PCTl8Horizontal Grid WearRemain In-Service233122c070.s3PCTl8Horizontal Grid WearRemain In-Service2367c06-0.84PCTl8Horizontal Grid WearRemain In-Service236t2tc03-0.92PCT20Horizontal Grid WearRemain In-Service2378c030.75PCTl8Horizontal Grid WearRemain In-Service2387c030.94PCTt6Horizontal Grid WearRemain In-Service2398c071.07PCTt5Horizontal Grid WearRemain In-Service247l0c030.88PCTt9Horizontal Grid WearRemain In-Service2509c04-0.9PCTl9Horizontal Grid WearRemain In-Service25lll8c03-0.98PCTl8Horizontal Grid WearRemain In-Service253I l8c03-0.89PCT2tHorizontal Grid WearRemain In-Service2s9tt4c040.62PCTl5Horizontal Grid WearRemain In-Service260I 15c03-0.96PCTl9Horizontal Grid WearRemain In-Service260ll5c06l.t2PCTl9Horizontal Grid WearRemain In-Service260I l5c07l.0rPCTl7Horizontal Grid WearRemain In-Service262l5c0s0.67PCTl9Horizontal Grid WearRemain In-Service262t5c041.03PCTl7Horizontal Grid WearRemain In-Service262ll3c07-0.98PCT25Horizontal Grid WearRemain In-Service262ll3c03-0.95PCTl8Horizontal Grid WearRemain In-Service262n3c040.62PCTl8Horizontal Grid WearRemain In-Service263tt4c031.04PCTt7Horizontal Grid WearRemain In-Service263tt4c060.64PCTl5Horizontal Grid WearRemain In-Service264l13c03-0.87PCTt7Horizontal Grid WearRemain In-Service27lll0c050.65PCTt6Horizontal Grid WearRemain In-Service272109c03-t.2PCT20Horizontal Grid WearRemain In-Service276107c030.65PCTl6Horizontal Grid WearRemain In-Service277104c03-0.76PCTt9Horizontal Grid WearRemain In-Service277104c04I .01PCTl8Horizontal Grid WearRemain In-Service278105c03-0.82PCTl8Horizontal Grid WearRemain In-Service279IMc031.04PCTl8Horizontal Grid WearRemain In-Service279104c04-0.96PCTt7Horizontal Grid WearRemain In-Service280103c06-0.9sPCTl9Horizontal Grid WearRemain In-Service283100c040.54PCT20Horizontal Grid WearRemain In-Service285100c06-0.99PCT2tHorizontal Grid WearRemain In-Service285r00c040.65PCTl9Horizontal Grid WearRemain In-Service285100c071.22PCTl8Horizontal Grid WearRemain In-Service28697c040.89PCTl8Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 12 of 19 SGRowColLocnInchlInd%TWCharacterizationResolution28697c030.68PCTl7Horizontal Grid WearRemain In-Service28699c040.7PCT22Horizontal Grid WearRemain In-Service28730c030.74PCTl8Horizontal Grid WearRemain In-Service28732c061.72PCTt9Horizontal Grid WearRemain In-Service28794c040.73PCT20Horizontal Grid WearRemain In-Service28798c06-0.95PCT30Horizontal Grid WearRemain In-Service28798c03-0.9sPCT23Horizontal Grid WearRemain In-Service28798c040.67PCTl9Horizontal Grid WearRemain In-Service28895c031.04PCT37Horizontal Grid WearRemain In-Service28895c030.53PCTt6Horizontal Grid WearRemain In-Service28895c060.78PCTl6Horizontal Grid WearRemain In-Service28932c03-0.94PCTt9Horizontal Grid WearRemain In-Service28932c030.82PCTl6Horizontal Grid WearRemain In-Senrice28994c03-0.98PCT25Horizontal Grid WearRemain In-Service28996c061.04PCTt7Horizontal Grid WearRemain In-Service29095c040.73PCT23Horizontal Grid WearRemain In-Service29095c07-0.95PCTl8Horizontal Grid WearRemain In-Service29t94c03-0.92PCT25Horizontal Grid WearRemain In-Service29235c04-0.86PCTl7Horizontal Grid WearRemain In-Service29235c03-0.92PCTl6Horizontal Grid WearRemain In-Service29293c07-0.87PCTl9Horizontal Grid WearRemain In-Service29293c040.73PCTl8Horizontal Grid WearRemain In-Service29293c06-0.88PCTl8Horizontal Grid WearRemain In-Service29582c03l.l5PCTl7Horizontal Grid WearRemain In-Service29685c060.89PCTt9Horizontal Grid WearRemain In-Service29685c071.06PCTt7Horizontal Grid WearRemain In-Service29687c03-0.82PCTt8Horizontal Grid WearRemain In-Service29786c03t.t2PCTl9Horizontal Grid WearRemain In-Service)9788c03-0.96PCT20Horizontal Grid WearRemain In-Service29843c050.71PCT20Horizontal Grid WearRemain In-Service29879c03t.t2PCTl9Horizontal Grid WearRemain In-Service29883c03l.l8PCTl8Horizontal Grid WearRemain In-Service29984c020.62PCTl6Horizontal Grid WearRemain In-Service21008lc040.78PCT23Horizontal Grid WearRemain In-Service2l0l78c03l.l5PCT20Horizontal Grid WearRemain In-Service2l0l80c031.2PCT20Horizontal Grid WearRemain In-Service210362c030.92PCTt7Horizontal Grid WearRemain In-Service210366c050.67PCT22Horizontal Grid WearRemain In-Service210374c03l.l5PCTl9Horizontal Grid WearRemain In-Service21046lc06-0.9PCTl6Horizontal Grid WearRemain In-Service210469c050.7PCTt9Horizontal Grid WearRemain In-Service210566c030.72PCT23Horizontal Grid WearRemain In-Service210566c050.67PCTt7Horizontal Grid WearRemain In-Service210568c030.75PCT20Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 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%TWCharacterizationResolution3I72H04-0.88PCTl5Horizontal Grid WearRemain In-Service3I72H05-0.96PCTt4Horizontal Grid WearRemain In-Service3I72H040.91PCTl3Horizontal Grid WearRemain In-Service3I78H04-0.9rPCT20Horizontal Grid WearRemain In-Service3I86H04-0.85PCTl5Horizontal Grid WearRemain In-Service372c030.83PCTt6Horizontal Grid WearRemain In-Service39r06c06-0.78PCTl8Horizontal Grid WearRemain In-Service3l0Ic030.72PCT23Horizontal Grid WearRemain In-Service3l0Ic05-0.92PCTt7Horizontal Grid WearRemain In-Service3l34c030.75PCTl8Horizontal Grid WearRemain In-Service3t45lHl00.68PCTl8Horizontal Grid WearRemain In-Service3t45lclt1.06PCTt7Horizontal Grid WearRemain In-Senrice3t48rH06-0.9PCTt8Horizontal Grid WearRemain In-Service3l52c04-0.97PCT20Horizontal Grid WearRemain In-Service3l52c030.83PCTt7Horizontal Grid WearRemain In-Service3l54c06-0.91PCTl9Horizontal Grid WearRemain In-Service3t7102ct21.06PCT20Horizontal Grid WearRemain In-Service3t7t02cl20.66PCTl8Horizontal Grid WearRemain In-Service3l853ct2-0.89PCTt7Horizontal Grid WearRemain In-Service3l92c04-0.98PCT23Horizontal Grid WearRemain In-Service3206tcl0-0.98PCTl9Horizontal Grid WearRemain In-Service323t24c060.69PCT23Horizontal Grid WearRemain In-Service3243c050.8PCTl8Horizontal Grid WearRemain In-Service3265c03-0.8PCTl8Horizontal Grid WearRemain In-Service328I l9ct2-0.86PCTl8Horizontal Grid WearRemain In-Service3325c03-0.89PCTl8Horizontal Grid WearRemain In-Service3345c03IPCT20Horizontal Grid WearRemain In-Service353r r8c060.69PCTl6Horizontal Grid WearRemain In-Service359t4c031.03PCT2tHorizontal Grid WearRemain In-Service36ttt4c060.83PCT26Horizontal Grid WearRemain In-Service36ltt4c06-0.75PCTt7Horizontal Grid WearRemain In-Service364l7c03-0.89PCTl6Horizontal Grid WearRemain In-Service364lllc04-0.77PCTl8Horizontal Grid WearRemain In-Service364lllc07IPCTt4Horizontal Grid WearRemain In-Service365l8c03-0.98PCTl8Horizontal Grid WearRemain In-Service367n2c06l.l IPCTt6Horizontal Grid WearRemain In-Service368t9c030.63PCTl8Horizontal Grid WearRemain In-Service37lr04c030.87PCTl7Horizontal Grid WearRemain In-Service376t07c040.75PCT2tHorizontal Grid WearRemain In-Service376t07c060.8PCT20Horizontal Grid WearRemain In-Service37722c030.72PCTl6Horizontal Grid WearRemain In-Service37924c030.75PCTl8Horizontal Grid WearRemain In-Service38225c030.69PCTt6Horizontal Grid WearRemain In-Service38227c030.67PCTl6Horizontal Grid WearRemain In-Service38326c030.95PCTl5Horizontal Grid WearRemain In-Service38429c030.72PCT20Horizontal Grid WearRemain In-Senrice38495c050.91PCTl6Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 14 of 19 SGRowColLocnInchlIndo/oTWCharacterizationResolution38499c03-0.92PCTt7Horizontal Grid WearRemain In-Service38528c030.7sPCT2tHorizontal Grid WearRemain In-Service38596c030.8PCTl8Horizontal Grid WearRemain In-Service38598c02-0.94PCT22Horizontal Grid WearRemain In-Service3863lc030.66PCTt7Horizontal Grid WearRemain In-Service38695c030.7 lPCT20Horizontal Grid WearRemain In-Service38697c02-0.82PCT22Horizontal Grid WearRemain In-Service38699c050.74PCT22Horizontal Grid WearRemain In-Service38699c02-0.85PCT2tHorizontal Grid WearRemain In-Service38699c040.62PCTl8Horizontal Grid WearRemain In-Service38699c03-0.89PCTt7Horizontal Grid WearRemain In-Service38932c030.69PCTl8Horizontal Grid WearRemain In-Service38996c03-0.92PCT22Horizontal Grid WearRemain In-Servrce39033c030.66PCT2tHorizontal Grid WearRemain In-Service39093c04-0.97PCTl5Horizontal Grid WearRemain In-Service39095c04-0.8sPCTt8Horizontal Grid WearRemain In-Service39095c03-0.8PCTl7Horizontal Grid WearRemain In-Service39t34c03-0.92PCT25Horizontal Grid WearRemain In-Service39235c03-0.98PCT25Horizontal Grid WearRemain In-Service3929lc03-0.83PCTl9Horizontal Grid WearRemain In-Service3929lc0s-0.95PCTt6Horizontal Grid WearRemain In-Service39293c04-0.98PCTt7Horizontal Grid WearRemain In-Service39336c03-0.89PCTl8Horizontal Grid WearRemain In-Service39336c040.69PCT18Horizontal Grid WearRemain In-Service39390c030.8PCTl9Horizontal Grid WearRemain In-Service39437c06-0.92PCTt9Horizontal Grid WearRemain In-Service3944tc07t.t2PCT21Horizontal Grid WearRemain In-Service39489c03-0.92PCTl8Horizontal Grid WearRemain In-Service39538c02-0.77PCTl9Horizontal Grid WearRemain In-Service39538c040.69PCTt7Horizontal Grid WearRemain In-Service39685c060.79PCT19Horizontal Grid WearRemain In-Service39740c040.72PCTt6Horizontal Grid WearRemain In-Service39742c040.69PCT26Horizontal Grid WearRemain In-Service39742c060.86PCTt6Horizontal Grid WearRemain In-Service310075c030.72PCTl8Horizontal Grid WearRemain In-Service3t0l68c030.8PCT2lHorizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 15 of 19 2-8wtts BaU1Rl4HarUZOtalTbe SuSG-SGMP-17-20Revision 0aDte l-IJi warfs lrar ull(rlt rlonuSGRowColLocnInchlIndo/oTWCharacterizationResolution4342cil-0.96PCT23Horizontal Grid WearRemain In-Service4342ct21.09PCTl9Horizontal Grid WearRemain In-Service4637cllI .01PCTt7Horizontal Grid WearRemain In-Service4673H07-0.87PCT2lHorizontal Grid WearRemain In-Service46127c030.76PCT23Horizontal Grid WearRemain In-Service4940cll-0.96PCTt7Horizontal Grid WearRemain In-Service4942H060.62PCT24Horizontal Grid WearRemain In-Service4942H070.72PCTt7Horizontal Grid WearRemain In-Service4l04tc09-0.87PCTt9Horizontal Grid WearRemain In-Service4l06lH07t.t2PCTl8Horizontal Grid WearRemain In-Service4t27lH06-0.86PCT22Horizontal Grid WearRemain ln-Service4t27lH07-t.23PCT22Horizontal Grid WearRemain In-Service4l378cl00.64PCT3lHorizontal Grid WearRemain In-Service4t43c040.69PCT20Horizontal Grid WearRemain In-Service4r863ct20.61PCT23Horizontal Grid WearRemain In-Service4l863cll0.64PCT2tHorizontal Grid WearRemain In-Service422123c03l.lPCTl8Horizontal Grid WearRemain In-Service423t24c03-0.88PCT2tHorizontal Grid WearRemain In-Service423r24c06-0.84PCT2tHorizontal Grid WearRemain In-Service4249lH06-0.22PCTt9Horizontal Grid WearRemain In-Service424125c030.87PCT24Horizontal Grid WearRemain In-Service424t25c060.75PCTl8Horizontal Grid WearRemain In-Service42562cll0.67PCT20Horizontal Grid WearRemain In-Service4263sct2-0.92PCTt7Horizontal Grid WearRemain In-Service426t23c040.7 6PCT2tHorizontal Grid WearRemain In-Service426123c08-0.93PCTl9Horizontal Grid WearRemain In-Service426123c03-0.9PCTl8Horizontal Grid WearRemain In-Service427124c03-0.93PCT23Horizontal Grid WearRemain In-Service428123c04-0.87PCT20Horizontal Grid WearRemain In-Service4305c05-0.78PCTl8Horizontal Grid WearRemain In-Service43l124c03-0.93PCT20Horizontal Grid WearRemain In-Service4325c020.76PCTt7Horizontal Grid WearRemain In-Service4327c020.82PCT20Horizontal Grid WearRemain In-Service4327c030.73PCTl8Horizontal Grid WearRemain In-Service4338c030.94PCTl8Horizontal Grid WearRemain In-Service43st22c030.97PCT20Horizontal Grid WearRemain In-Service4438c040.98PCTl9Horizontal Grid WearRemain In-Service4449c06-0.7PCTl8Horizontal Grid WearRemain In-Service444t2tc03IPCT22Horizontal Grid WearRemain In-Service4458c03-0.82PCTr8Horizontal Grid WearRemain In-Service449il0ct2-0.48PCTl8Horizontal Grid WearRemain In-Service45087H0l-t.22PCTl9Horizontal Grid WearRemain In-Service453r l8c02-0.87PCT2lHorizontal Grid WearRemain In-Service460I 15c070.9PCT18Horizontal Grid WearRemain In-Service463tt4c06l.l IPCT2lHorizontal Grid WearRemain In-Service46stt2c05-0.84PCTt9Horizontal Grid VlearRemain In-Servrce47t108c060.73PCTt6Horizontal Grid WearRemain In-Servicert Grid Wear Indications - SG 4June 2017Page 16 of 19 SGRowColLocnInchlIndo/oTWCharacterizationResolution477104c030.71PCT26Horizontal Grid WearRemain In-Service478103c030.8PCTt8Horizontal Grid WearRemain In-Service48398c030.71PCTl8Horizontal Grid WearRemain In-Service48398c04-0.9PCTt6Horizontal Grid WearRemain In-Service483100c030.72PCT20Horizontal Grid WearRemain In-Service48497c04-0.94PCT20Horizontal Grid WearRemain In-Service48497c030.74PCTl9Horizontal Grid WearRemain In-Service484l0lc04-0.94PCT22Horizontal Grid WearRemain In-Service484l0lc030.71PCT2tHorizontal Grid WearRemain In-Senrice484l0rc020.68PCT20Horizontal Grid WearRemain In-Service484l0lc06-0.91PCTl8Horizontal Grid WearRemain In-Service48528c03-0.86PCT22Horizontal Grid WearRemain In-Service48594c03-0.84PCT20Horizontal Grid WearRemain In-Service48596c04-0.95PCTt8Horizontal Grid WearRemain In-Service485100c04-0.86PCT20Horizontal Grid WearRemain In-Service48792CM0.78PCTr9Horizontal Grid WearRemain In-Service48796c03-0.89PCT24Horizontal Grid WearRemain In-Service48796c05-0.72PCTt9Horizontal Grid WearRemain In-Service48798c04-0.89PCT20Horizontal Grid WearRemain In-Service4883lc03-0.95PCT22Horizontal Grid WearRemain In-Service48895c03-0.75PCTt7Horizontal Grid WearRemain In-Service48994c0s0.66PCTt7Horizontal Grid WearRemain In-Service48996c03-0.89PCT23Horizontal Grid WearRemain In-Service48996c050.7 lPCTl8Horizontal Grid WearRemain In-Service49035c03I .18PCTl9Horizontal Grid WearRemain In-Service49039c040.88PCTl7Horizontal Grid WearRemain In-Service4909lc04-0.92PCTl8Horizontal Grid WearRemain In-Service49l34c03-0.89PCT24Horizontal Grid WearRemain In-Service49t34c050.74PCT20Horizontal Grid WearRemain In-Service49l36c040.7 tPCT22Horizontal Grid WearRemain In-Service49l36c03-t.2PCT2lHorizontal Grid WearRemain In-Service49l38c03-0.92PCT22Horizontal Grid WearRemain In-Service49l92c04-0.8PCT20Horizontal Grid WearRemain In-Service49l94c030.71PCT23Horizontal Grid WearRemain In-Service49237c03-0.86PCT25Horizontal Grid WearRemain In-Service4929lc030.65PCTt7Horizontal Grid WearRemain In-Service49293c030.74PCT20Horizontal Grid WearRemain In-Service49336c03-0.t 4PCT22Horizontal Grid WearRemain In-Service49336c050.68PCT2tHorizontal Grid WearRemain In-Service49437c03t.l7PCT34Horizontal Grid WearRemain In-Service49439c03-0.86PCT22Horizontal Grid WearRemain In-Service49439c07-0.92PCTl8Horizontal Grid WearRemain In-Service4944lc03-0.92PCT23Horizontal Grid WearRemain In-Service49540c0s0.71PCTl9Horizontal Grid WearRemain In-Service49540c061.03PCTl8Horizontal Grid WearRemain In-Service49542c03-0.83PCT26Horizontal Grid WearRemain In-Service49586c030.68PCT24Horizontal Grid WearRemain In-Service4964tc030.7 lPCT22Horizontal Grid WearRemain In-ServiceSG-SGMP-17-20Revision 0June 2017Page 17 of 19 SGRowColLocnInchlInd%TWCharacterizationResolution4964lc0s-0.98PCTl9Horizontal Grid WearRemain In-Service49643c03-0.95PCTl9Horizontal Grid WearRemain In-Service49645c03-0.92PCT2lHorizontal Grid WearRemain In-Service4968lc030.92PCTl8Horizontal Grid WearRemain In-Service49742c0s-0.97PCT22Horizontal Grid WearRemain In-Service49778c030.8 rPCT2lHorizontal Grid WearRemain In-Service49786c030.74PCT25Horizontal Grid WearRemain In-Service49788c030.8PCT2tHorizontal Grid WearRemain In-Service49788c03-0.74PCT18Horizontal Grid V/earRemain In-Service49788c07-0.86PCT18Horizontal Grid WearRemain In-Service49843c070.77PCTl9Horizontal Grid WearRemain In-Service49843c03-0.95PCTl8Horizontal Grid WearRemain In-Service49845c03-0.94PCT30Horizontal Grid WearRemain In-Service4988lc030.59PCTl8Horizontal Grid WearRemain In-Service49885c030.7 lPCT23Horizontal Grid WearRemain In-Service4994c030.88PCTt9Horizontal Grid WearRemain In-Service49944c060.79PCTt7Horizontal Grid WearRemain In-Service49944c080.71PCTl7Horizontal Grid WearRemain In-Service49946c03-0.89PCT22Horizontal Grid WearRemain In-Service41008rc030.7PCTl8Horizontal Grid WearRemain In-Service410083c03-0.86PCT2tHorizontal Grid WearRemain In-Service410083c07t.t7PCTl8Horizontal Grid WearRemain In-Service4l0t80c030.7PCT20Horizontal Grid WearRemain In-Service4t0249c030.8PCT2lHorizontal Grid WearRemain In-Service4r025lc040.78PCTl9Horizontal Grid WearRemain In-Service4t0279c030.73PCTl9Horizontal Grid WearRemain In-Service410376c030.67PCT2tHorizontal Grid WearRemain In-Service41047lc03-0.9PCT23Horizontal Grid WearRemain In-Servicee. Number of Tubes Plugged During the Inspection Outage for Each Active DegradationMechanismThere were no tubes required to be plugged during the Watts Bar UlRl4 RSG in-serviceinspection. Table 2-9 below provides the numbers of tubes plugged for each degradationmechanism 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 Mechanismsclrscr2SG13SG14TotalPlugged 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-17-20Revision 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 InteerityA 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 integrityperfonnance 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 inspectionsshowed 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 inspectionsperformed 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-17-20Revision 0June 2017Page 19 of 19
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