ML17160A181

Summary of Conference Call with Palisades Nuclear Plant Regarding the Spring 2017 Steam Generator Inspections (CAC No. MF9396)

ML17160A181
Person / Time
Site:	Palisades
Issue date:	06/14/2017
From:	Rankin J K Plant Licensing Branch III
To:	Entergy Nuclear Operations
Rankin J K, NRR/DORL/LPL3, 415-1530
Shared Package
ML17166A504	List: ML17160A181
References
CAC MF9396
Download: ML17160A181 (26)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Vice President, Operations Entergy Nuclear Operations, Inc. Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, Ml 49043-9530 June 14, 2017

SUBJECT:

SUMMARY OF CONFERENCE CALL WITH PALISADES NUCLEAR PLANT REGARDING THE SPRING 2017 STEAM GENERATOR INSPECTIONS (CAC NO. MF9396)

Dear Sir or Madam:

On May 5, 2017, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with representatives of Entergy Nuclear Operations, Inc. regarding the ongoing steam generator inspection activities at the Palisades Nuclear Plant. A list of the conference call participants is contained in Enclosure 1. A list of discussion questions were discussed on the call and are attached to the enclosed conference call summary in Enclosure 2. If you have any questions regarding this matter, I may be reached at 301-415-1530. Docket No. 50-255

Enclosure:

1. List of Participants 2. Conference Call Summary cc: Distribution via ListServ Sincerely, Plant Licensing Branch Ill Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation LIST OF PARTICIPANTS MAY 5. 2017, CONFERENCE CALL WITH ENTERGY NUCLEAR OPERATIONS, INC. PALISADES NUCLEAR PLANT SPRING 2017 STEAM GENERATOR INSPECTIONS NUCLEAR REGULATORY COMMISSION Andrew Johnson Paul Klein Jennie Rankin Mel Holmberg Edison Fernandez Eric Duncan ENTERGY NUCLEAR OPERATIONS, INC. Dustin Daggett Kevin O'Connor Joe Jerz Jim Miksa Barb Dotson Dan Meatheany Jeff Hardy Steve Brown Enclosure 1 CONFERENCE CALL SUMMARY REGARDING PALISADES NUCLEAR PLANT SPRING 2017 STEAM GENERATOR INSPECTIONS DOCKET NO. 50-255 CAC NO. MF9396 On May 5, 2017, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with representatives of Entergy Nuclear Operations, Inc. (the licensee) regarding the ongoing steam generator (SG) inspection activities at Palisades Nuclear Plant (Palisades). The licensee-provided attachment is included at the end of this conference call summary. The data in the attachment is preliminary. Palisades has two Combustion Engineering Model 2530 replacement SGs. Each SG has 8,219 mill-annealed Alloy 600 tubes with an nominal outside diameter of 0. 750 inches and a nominal wall thickness of 0.042 inches. Stainless steel, lattice-type tube supports, diagonal straps, and vertical straps support the tubes at various locations. The tubes were expanded through the full depth of the tubesheet using an explosive process. Undefined abbreviations used in the licensee-provided document (Attachment 1) include: * % TW -Percent Through-Wall * +Pt -Plus-point

• AILPC -Accident Induced Leakage Performance Criteria

• C* -C-star

• Circ -Circumferential

• CL -Cold-Leg

• CM -Condition Monitoring

• CMOA -Condition Monitoring Operational Assessment

• DB -Diagonal Bar

• ECT -Eddy Current Testing

• EFPY -Effective Full Power Year

• EPRI -Electric Power Research Institute

• GPO -Gallons Per Day

• HF -High Frequency

• HL-Hot-Leg

• IQDA -Independent Qualified Data Analyst

• ISi -lnservice Inspection

• MR -Mid-Range

• NIA -Not Applicable

• NDE -Non Destructive Examination

• NRC -U.S. Nuclear Regulatory Commission

• ODSCC -Outside Diameter Stress Corrosion Cracking

• PDA-Percent Degraded Area

• psi -pounds per square inch

• POD -Probability of Detection

• PWSCC -Primary Water Stress Corrosion Cracking

• 1 R25 or RF25 -Unit 1 Refueling Outage 25

• SAi -Single Axial Indication

• SCI -Single Circumferential Indication

• SG -Steam Generator

• SGMP -Steam Generator Management Program

• SIPC -Structural Integrity Performance Criteria

• SVI -Single Volumetric Indication

• TEC -Tube End Cold

• TEH -Tube End Hot

• TR-Topical Report Enclosure 2

-2 -* TSPs -Tube Support Plates

• V-Volts

• TIS -Top-of-tubesheet

• Vpp -Volts Peak-to-Peak

• TW -Through Wall

• VS -Vertical Strap Information exchanged during the call and not included in the licensee-provided information is summarized below:

• At the time of the call, the licensee was approximately 94 to 95 percent complete with their base scope of eddy current inspections.

• The licensee stated that an ODSCC indication was found in the free span region of the tube located in row 62, column 101 of SG B. The indication was between the 03 and 04 tube support plates on the HL side of SG B. There was no indication of a tube ding at this location. The indication had a measured voltage of 1.18 volts and a maximum depth of 71 percent TW. The indication had a structural equivalent length of 0.65 inches, a structural equivalent depth of 63.5 percent TW, and required in-situ pressure testing to confirm structural integrity of the tube. This indication was one of nine indications that were aligned over a 12-inch length of the tube.

• A historical review of eddy current inspection data was ongoing at the time of the call, but the licensee noted that a preliminary review back to 2010 showed no change in the indication requiring in-situ testing.

• The licensee stated that the wear growth in both SGs was very small and only one tube (in SG A) was found with wear greater than 40 percent TW.

• The licensee noted that at the time of the call, there were 15 potential tubes to be plugged in SG A and 3 potential tubes to be plugged in SG B. The licensee noted they are using mechanical rolled plugs.

• The in-situ testing was scheduled for Saturday, May 6, 2017. After the in-situ testing, foreign object search and retrieval (FOSAR) of possible loose parts (PLPs) would commence. The PLPs noted during the current inspection were mostly low voltage and had "sludge-like" indications. None of the PLPs were noted at upper tube support structures.

• Other than the free span indication that required in-situ pressure testing, there were no unexpected or unusual results.

• After the call, the licensee notified the NRC that the in-situ pressure testing was conducted at 2 pm on May 6, 2017. Two-minute hold points were performed at pressures of 1600 psi, 3000 psi, 4000 psi, and 4600 psi. No evidence of leakage was observed at any of the hold points. The NRC staff did not identify any issues that required follow-up action at this time. STEAM GENERATOR TUBE INSPECTION DISCUSSION DURING PALISADES 2017 (RF25) OUTAGE (Preliminary Information)

STEAM GENERATOR TUBE INSPECTION DISCUSSION DURING PALISADES 2017 (1R25) OUTAGE (Preliminary Information) Currently Palisades is -93% through the base scope eddy current inspection and starting the special interest inspection scope as of 5/5/2017 at -0430 hours 1. Discuss any trends in the amount of primary-to-secondary leakage observed during the recently completed cycle. Refer to attached Primary to Secondary Leak Rate for Operational Cycle 25 Primary to Secondary Leak Rate graph. Leakage has been minimal all cycle. 2. Discuss whether any secondary side pressure tests were performed during the outage and the associated results. No secondary side pressure tests are planned for the 2017 refueling outage (1 R25). 3. Discuss any exceptions taken to the industry guidelines. In cycle 22, Palisades submitted a deviation to the NRC: Technical Justification Supporting Deviation from the EPRI Appendix I ETSS for ODSCC Sizing will deviate from the "needed" requirement to use an approved Examination Technique Specification Sheet (ETSS) contained in The "EPRI PWR Steam Generator Examination Guidelines -Revision 7", Section 6.2 for ODSCC sizing. Palisades will instead use a modified ETSS for ODSCC. The modified ETSS will be identical to the ETSS approved per Appendix I of the examination guidelines with the exception that only the sub-set of data from CE plants will be used instead of the combined fleet data set used in the approved ETSS. A comprehensive review of axial ODSCC in Palisades steam generators shows that Appendix 128432 over sizes maximum depth values for axial ODSCC at Palisades. There is a reasonable basis to submit a deviation request for maximum depth sizing of axial ODSCC indications at Palisades. The request is relatively modest since it uses the Combustion Engineering (CE) subset of the well vetted data of Appendix 128432. The regression slope and standard error of regression are retained. Only the intercept parameter is changed. This provides an across the board reduction of NOE maximum depth sizing of 11.23 % TW. This will lead to about a 1000 psi increase in calculated condition monitoring burst pressures and much better matching of projected and measured NOE maximum depths.

The deviation was implemented in the 2012 (1 R22) refueling outage steam generator inspection for the remaining life of the existing Palisade steam generators. 4. For each steam generator, provide a description of the inspections performed including the areas examined and the probes used (e.g., dents/dings, sleeves, expansion-transition, LI-bends with a rotating probe), the scope of the inspection (e.g., 100% of dents/dings greater than 5 volts and a 20% sample between 2 and 5 volts), and the expansion criteria. Full length ECT bobbin coil examination of all in-service tubes (except row 1, 2, and 3 U-bends) in both SGs. ECT +PointŽ coil examinations (both SGs):

• 100% of rows 1 , 2, and 3 U-bends.

• 100 examination of in-service freespan ding (ONG) indications >5V between tubesheet hot (TSH) and tubesheet cold (TSC)

• 100% of hot leg from TTS + 3.5-4" (depending on sludge height) to a minimum of 13.5" below the bottom of the expansion transition.

• 100% of free span dings >5V between TSH and TSC.

• 100% of >2V dents at egg crate, diagonal bar, and vertical strap intersections between TSH and TSC.

• 25% of historical % TW calls at diagonal bars and vertical straps, selected from indications not inspected in 1 R24

• 100% of historical TRA(trackable anomaly) indications

• The outer 3 peripheral tubes at the cold leg from TTS+4" to TTS-2" for detection of possible loose parts or wear signals.

• The periphery region is defined to be the outer three (3) tubes exposed to the annulus, all tubes in rows 1 through 4, and the inner three (3) tubes around the stay cylinder region.

• One tube around all tubes with foreign object signals as well as the affected tubes.

• 100% of bobbin I-Code indications. I-Code indications include: Absolute Drift Indication (ADI), Dent or Ding with Indication (DOI), Differential Freespan Indication (DFI), Distorted Support Plate Indication (OSI), Distorted Tubesheet Indication (DTI), Loose Part Indication (LPI) and Quantifiable Indication (NQI). The expansion criteria for each degradation is attached to the back in tables 9-1 through 9-4. 5. For each area examined (e.g., tube supports, dent/dings, sleeves, etc), provide a summary of the number of indications identified to-date of each degradation mode (e.g., number of circumferential primary water stress 2 corrosion cracking indications at the expansion transition). For the most significant indications in each area, provide an estimate of the severity of the indication (e.g., provide the voltage, depth, and length of the indication). In particular, address whether tube integrity (structural and accident induced leakage integrity) was maintained during the previous operating cycle. In addition, discuss whether any location exhibited a degradation mode that had not previously been observed at this location at this unit (e.g., observed circumferential primary water stress corrosion cracking at the expansion transition for the first time at this unit). As of 5/4/2017 @ 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> Number Number Integrity SG Location Type Indications Tubes Acceptable A TSH Axial ODSCC 12 10 YES A TSH Axial PWSCC 1 1 YES A TSH Circ PWSCC 0 0 N/A A TSH Circ ODSCC 3 3 YES A TSH Volumetric 0 0 N/A A TEC to TEH Wear> 40 1 1 YES B TSH Axial ODSCC 3 2 YES B TSH Axial PWSCC 0 0 N/A B TSH Circ PWSCC 0 0 N/A B TSH Circ ODSCC 0 0 N/A B TSH Volumetric 0 0 N/A B TEH to TEC Wear> 40 0 0 N/A A Tube Supports Axial ODSCC O* O* N/A A Freespan Axial ODSCC O* O* N/A B Tube Supports Axial ODSCC O* O* N/A B Freespan Axial ODSCC 9* 1* N/A Total 29 18 *Some support/freespan indications have been identified but are not completely through the data resolution process as of this snapshot. Updated quantities may be presented verbally during the phone call. 3 SGA

• Axial ODSCC at TSH " 60 ,, 60 * ,, . ... ..

• 00{) '.l2'3 +Point Probe. ETSS 1-28431 100 "' 225 Burst Equivalent length (Inches)

• Axial PWSCC within tubesheet. Indication parameters: o Max voltage: 1.67 V o Length: 0.45" o Max depth: 100 %TW o SIPC and AILPC criteria satisfied

• Gire ODSCC at TSH. Max indication parameters (not the same indication): o Voltage: 0.97 V o Circumferential extent: 0.47" (72 degrees) o Depth: 79 %TW o PDA: 9.7 o SIPC and AILPC criteria satisfied

• Tube support wear: o Max depth: 46 % TW o SIPC and AILPC criteria satisfied

• No foreign object wear flaws 4 SG B

• Axial ODSCC at TSH -+Point Probe, ETSS 1-28431 so 70 "' I ---Lm*

• Flaws 000 075 '50 Burst Equivalent Length (Inches)

• Axial ODSCC in the Free Span o Max Voltage: 1.18 o Length: 0.65" o Max depth 70.5% o Exceeded Screening for Burst

• No foreign object wear flaws Both SGs -Support Structure Wear

• Average growth rate is essentially zero

• 95/50 growth rate is <3 % TW/EFPY Frees pan There is one indication in SGB (Tube 62-101) that has an indication between the 04hot and 03hot support plates. It has a total length of -12 inches with 9 indications. The second indication is the largest and exceeded the screening criteria for burst. It has been scheduled for in-situ testing. The details of the flaw are identified above for SGB. U-Bends There are no U-bend repairable indications reported to date. 5

6. Describe repair/plugging plans. Currently there are 15 potential tubes requiring tube plugging in SG E-50A and 3 potential tubes in SG E-508. All stress corrosion cracking (SCC) indications will be plugged. Any circumferential SCC indications near the top-of-tubesheet (TTS) will be stabilized and plugged. C* depth is applicable to the HL and CL All wear indications (at support structures) greater than or equal to 40% TW will be plugged. 7. Describe in-situ pressure test and tube pull plans and results (as applicable and if available). Based on the available data to date, there is one tube that will be tested in SGB. 8. Discuss the following regarding loose parts: What inspections are performed to detect loose parts? The hot leg top of tube sheet (TTS) region is inspected with +Pt up to a nominal 4 inches, but not less than 3.5 inches and not less than the height of the sludge pile, above TTS. A similar inspection is performed for the cold leg TTS region 3 tubes deep along periphery and tube lane and 3 inches above the TTS. Foreign object search and retrieval (FOSAR) will be performed for the periphery, tube lane annulus, and stay cavity areas. A description of any loose parts detected and their location within the SG As of 5/4/2017 at 0300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />, the following are the number of potential loose parts identified with the plus point inspection: E-50A E-508 164 PLP Calls in 136 Tube Locations 105 PLP Calls in 90 Tube Locations The vast majority of the indications are historical. None have resulted in tube degradation. If the loose parts were removed from the SG Anticipate FOSAR start on 5/6/2015. 6 Indications of tube damage associated with the loose parts To date, ECT has not identified any wear associated with loose parts. Visual inspection may yet identify foreign object wear. 9. Discuss the scope and results of any secondary side inspection and maintenance activities (e.g., in-bundle visual inspections, feedring inspections, sludge lancing, assessment deposit loading, etc). Sludge lancing was not performed. 10. Discuss any unexpected or unusual results. Currently there are no unexpected or unusual results. There are no tubes that have failed the screening criteria requiring in-situ pressure testing 11. Provide the schedule for steam generator-related activities during the remainder of the current outage. The base -scope bobbin and top of tube sheet inspections are nearly complete. Special interest examinations are ongoing. U-bend examinations are pending. Nominal SG schedule is as follows: In-situ testing 5/6/17 Scheduled complete ECT 5/8/17 Scheduled complete repair 5/9/17 Scheduled SG closeout 5/10/17 Nozzle dam removal and manway installation complete 5/12/2017 7

""' ..... 0 C\J O> c *;:: Cl.. (/) c 0 *u Q) Cl.. CJ) c l() C\J a: CJ) Q) ""O cu ca 0.... ..... 0 --c Q) E CJ) CJ) Q) CJ) c 0 "1ij O> Q) 0 ..... 0 Q) c Q) 0 E cu Q) U5 cu ..., ta ... ..:.=: ta .!1J >Ln ._ M ta T"'t "tJ I cW oX u-cu c Cl') a. 0 C> ..., -> a.n ._ N *-u ... > a. u C> ... Cl') 0 U) u. cu "C ta U) 8 8 .:f Ni N ..-I Aeo Jad suo11e9 oo:o LlOl/tl/tl oo:o L!Ol/lZ/£ oo:o LlOl/tl/l oo:o L!Ol/tl/1 oo:o 9107./17./7.T. oo:o 9107./H/H oo:o 9107./H/01 oo:o 9!07./H/6 oo:o 9!07./17./8 oo:o 9107./H/ L oo:o 9!07./17./9 oo:o 9107./17./S oo:o 9!07./17./tl oo:o 9107./17./£ oo:o 9!07./17./7. oo:o 9!07./H/1 oo:o S107./H/7.T. oo:o S107./H/H oo:o SlOZ/17./01 8 ci Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 8-1: Eddy Current technique Table Degradation EPRI Demonstrated Applicability Detection? Sizing? POD izing Parameters Mechanism ETSS licabilitv BOBBIN rrube to Tube 13091.1 Depth= 0.94*NDE + 1.24 Sy,x Wear Bobbin Rev. O Freespan tube-to-tube wear None Yes CMOA = 1.57 N = 40 R= 1.0 128413 Freespan (excluding u-bend), POD: Log-Logistic Axial ODSCC Bobbin Rev. 3 eggcrate, sludge pile, & broached None Yes No Slope = 4.296 TSPs with or without dents S2Voo Intercept = -5.679 lAxial ODSCC Bobbin 24013.1 Freespan including dings S5V None Yes No Rev. 2 -Foreign 27091.2 Foreign object wear Extended for I-Depth= 0.79*NDE + 12.85 Sy,x Object Wear Bobbin Rev. 1 (part not present); 1-690 tubing tubing Yes CMOA = 13.49 N = 271 R= 0.8 96004.1 AVBs, TSPs, Depth = 0.98*NDE + 2.89 Sy,x Support Wear Bobbin Rev. 13 vertical and diagonal straps Dents <5V Yes CMOA = 4.19 N = 76, R = 0.98 96005.2 Freespan in the presence of Depth = 0.27*NDE + 28.42 Sy,x Pitting Bobbin Sludge Pile Yes CMOA = 13.36 Rev.9 per N = 62, R = 0.41 Axial ODSCC Depth = 0.9994*NDE + 0.4998 Sy,x = 11.856 128424 N = 589, R = 0.88 Rev. 3 Depth: CMOA (detect); (with or without dents POD: Log-Logistic BED= 0.9941*NDE + 2.7324 Axial ODSCC +PointŽ None Yes BED: CMOA Slope = 11 .4155 Sy,x = 10.685 128431 <=2vpp) and sludge pile Intercept= -17.7154 N = 589, R = 0.895 Rev. 2 BEL: CMOA (sizing) BEL= 0.6451*NDE + 0.0785 Sy,x=0.106 N = 589, R = 0.723 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Degradation Probe EPRI Demonstrated Applicability Extended Detection? Sizing? POD Sizing Parameters Mechanism Tvoe ETSS Depth = 1.0069*NDE + 0.3736 Sy,x = 12.329 128425 N = 676, R = 0.862 Rev. 3 Depth: CMOA (detect) Freespan (excluding u-bend), POD: Log-Logistic BED = 0.972*NDE + 3.698 Axial ODSCC +PointŽ eggcrate, & broached TSPs with or None Yes BED: CMOA Slope= 6.7176 Sy,x= 12.153 128432 without dents S2Vpp Intercept= -9.146 N = 676, R = 0.859 Rev.2 BEL: CMOA (sizing) BEL= 0.516*NDE + 0.208 Sy,x = 0.2 N = 676, R = 0.592 10411.1 Higher Row U-Depth =1.16*NDE -10.4 Axial ODSCC +PointŽ Rev. O Low Row U-bends bends Yes CMOA Sy,x= 19.02 N=17, R=0.69 PDA = 0.3*NDE +26.49 Sy,x = 18.14 121409.1 Support structures, freespan, PDA: Information N = 9 R = 0.36 Axial ODSCC +PointŽ Li-bends Yes Rev. 7 sludge pile, & tubesheet crevice Length: Information Length= 1.14*NDE +0.03 Sy,x = 0.21 N = 9 R = 0.94 Depth = 0.13*NDE + 7 4.55 Sy,x Freespan dings & = 14.44 122401.1 dented eggcrates, Depth: Information N=22,R=0.13 Axial ODSCC Dented TSPs Yes Rev. 4 diagonal bars and Length: CMOA Length= 0.74*NDE + 0.27 Sy,x vertical straps = 0.27 N = 22, R = 0.62 Axial PWSCC Depth= 0.68*NDE + 14.45 Sy,x = 12.44 N = 33, R= 0.64 Depth: CMOA Axial PWSCC 120511.1 Tubesheet PDA = 0.21*NDE + 28.77 Sy,x +PointŽ Rev. 8 Expansion Transitions Yes PDA: Information = 7.95 N = 32, R= 0.33 Length: CMOA Length =1.1 O*NDE -0.01 Sy,x = 0.13 N = 32, R= 0.87 I'-..-0 N Cl c: *c: a. (/) c: 0 ts Q) a. (/) c: ll) N 0::: (/) Q) "O Cl! ro a... ..... .E c Q) E (/) (/) Q) (/) (/) <( c: 0 15 "O Cl Q) 0 ..... .9 Q) c: Q) (9 E Cl! Q) U5 cu ..., ta cu ..... >Ln ta t""'f "'C I cW oX u-cu Q V) Q. 0 C> ..., ->a.n ta cu E-*-u 0:. e; C> V) 0 "' u. cu "'C ta "' *--ta Q. 8 _,:f M N .-< Aea Jad suo11e!> -oo:o LtoZ/tz/fl oo:o LtoZ/tz/£ oo:o LlOZ/tz/Z ----= oo:o LtOZ/tz/t oo:o 9tOZ/H/zt -oo:o 910Z/H/tt oo:o 910Z/H/Ot oo:o 9tOZ/tZ/6 oo:o 910Z/tZ/8 oo:o 910Z/tz/ L oo:o 910Z/tz/9 --oo:o 9tOZ/tz/S oo:o 9toZ/tZ/fl oo:o 9toZ/tz/£ oo:o 910Z/tz/Z oo:o 910Z/tz/t oo:o StoZ/H/Zt -oo:o StoZ/H/H oo:o StoZ/H/Ot 8 0 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 8-1: Eddy Current technique Table Degradation EPRI Demonstrated Applicability etection? izing? POD izing Parameters Mechanism ETSS licabilitv BOBBIN rrube to Tube 13091.1 Depth= 0.94*NDE + 1.24 Sy,x Wear Bobbin Rev. 0 Freespan tube-to-tube wear None Yes CMOA = 1.57 N = 40 R= 1.0 128413 Freespan (excluding u-bend), POD: Log-Logistic Axial ODSCC Bobbin Rev. 3 sludge pile, & broached None Yes No Slope = 4.296 with or without dents S2Vpp I nterceot = -5. 679 Axial ODSCC Bobbin 24013.1 Freespan including dings S5V None Yes No Rev. 2 Foreign 27091.2 Foreign object wear Extended for I-Depth= 0.79*NDE + 12.85 Sy,x Object Wear Bobbin Rev. 1 (part not present); 1-690 tubing KJOO tubing Yes CMOA = 13.49 N = 271 R= 0.8 96004.1 AVBs, TSPs, Depth = 0.98*NDE + 2.89 Sy,x Support Wear Bobbin Rev. 13 vertical and diagonal straps Dents <5V Yes CMOA = 4.19 N = 76, R = 0.98 96005.2 Freespan in the presence of Depth = 0.27*NDE + 28.42 Sy,x Pitting Bobbin Sludge Pile Yes CMOA = 13.36 Rev. 9 op per N = 62, R = 0.41 Axial ODSCC Depth = 0.9994*NDE + 0.4998 Sy,x=11.856 128424 N = 589, R = 0.88 Rev. 3 Depth: CMOA (detect); TSP (with or without dents POD: Log-Logistic BED= 0.9941*NDE + 2.7324 Axial ODSCC +PointŽ None Yes BED: CMOA Slope= 11.4155 Sy,x = 10.685 128431 <=2vpp) and sludge pile Intercept= -17.7154 N = 589, R = 0.895 Rev. 2 BEL: CMOA (sizing) BEL= 0.6451*NDE + 0.0785 Sy,x = 0.106 N = 589, R = 0.723 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Degradation Probe EPRI Demonstrated Applicability Extended Detection? Sizing? POD Sizing Parameters Mechanism rrvpe ETSS APPlicabilitv Depth = 1.0069*NDE + 0.3736 Sy,x = 12.329 128425 N = 676, R = 0.862 Rev. 3 Depth: CMOA (detect) Freespan (excluding u-bend), POD: Log-Logistic BED = 0.972*NDE + 3.698 lAxial ODSCC +PointŽ eggcrate, & broached TSPs with or None Yes BED: CMOA Slope= 6.7176 Sy,x = 12.153 128432 !without dents :>2Vpp Intercept = -9.146 N = 676, R = 0.859 Rev.2 BEL: CMOA (sizing) BEL= 0.516*NDE + 0.208 Sy,x = 0.2 N = 676, R = 0.592 10411.1 Higher Row U-Depth =1.16*NDE -10.4 lAxial ODSCC +PointŽ Rev. 0 Low Row U-bends bends Yes CMOA Sy,x = 19.02 N=17, R=0.69 PDA = 0.3*NDE +26.49 Sy,x = 18.14 21409.1 Support structures, freespan, PDA: Information N = 9 R = 0.36 lAxial ODSCC +PointŽ U-bends Yes Rev. 7 !Sludge pile, & tubesheet crevice Length: Information Length= 1.14*NDE +0.03 Sy,x = 0.21 N = 9 R = 0.94 Depth = 0.13*NDE + 74.55 Sy,x Freespan dings & = 14.44 Depth: Information N = 22, R = 0.13 Axial ODSCC +PointŽ 22401.1 Dented TSPs dented eggcrates, Yes Rev. 4 diagonal bars and Length: CMOA Length= 0.74*NDE + 0.27 Sy,x vertical straps = 0.27 N = 22, R = 0.62 Axial PWSCC Depth= 0.68*NDE + 14.45 Sy,x = 12.44 N = 33, R= 0.64 Depth: CMOA 20511.1 PDA = 0.21*NDE + 28.77 Sy,x Axial PWSCC +PointŽ Rev. 8 Expansion Transitions Tubesheet Yes PDA: Information = 7.95 N = 32, R= 0.33 Length: CMOA Length =1.1 O*NDE -0.01 Sy,x = 0.13 N = 32, R= 0.87 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Degradation Probe EPRI Demonstrated Applicability Extended Detection? Sizing? POD Sizing Parameters Mechanism Type ETSS l4oolicabilitv Depth = 0.90*NDE + 7.56 Sy,x = 15.28 96703.1 rrubesheet, Depth: CMOA N = 46, R= 0.81 PWSCC +PointŽ Rev. 17 Dents/Dings Dented supports Yes Length: CMOA Length =1.00*NDE + 0.13 Sy,x = 0.28 N = 46, R= 0.91 96511.2 Higher Row U-Depth= 0.56*NDE + 19.06 Sy,x PWSCC +PointŽ Low Row U-bends Yes CMOA = 14.97 Rev. 16 bends N = 24, R= 0.66 +PointŽ 99997.2 Higher Row U-Depth = 0.95*NDE -5.61 Sy,x Axial PWSCC Low Row U-bends Yes CMOA = 10.50 High Freq Rev. 10 bends N = 24, R= 0.85 Circ ODSCC Depth = 0.13*NDE +60.10 Sy,x = 24.50 N = 40, R= 0.14 Depth: Information 21410.1 U-bends, PDA = 1.02*NDE +21.84 Sy,x Circ ODSCC +PointŽ Rev. 6 Expansion Transitions freespan dings, Yes PDA: CMOA = 23.58 Note 4 dented supports N = 38 R = 0.47 Length: Not usable Length = 1.24*NDE +0.42 Sy,x = 0.69 N = 38 R = 0.69 22842.1 Freespan dings, Length = 0.52*NDE + 0.03 Sy,x Circ ODSCC +PointŽ Rev. 4 Dented Supports u-bends Yes CMOA (Note 3) = 0.26 N = 18, R= 0.75 Circ PWSCC 111524 U-bends, POD: Log-Logistic Circ PWSCC +PointŽ Rev. O Expansion Transitions Dents/Dings, Yes No Slope = -20.522 Tubesheet Intercept= 13.733 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Degradation Probe EPRI Demonstrated Applicability Extended Detection? Sizing? POD Sizing Parameters Mechanism rrvpe ETSS APPiicabiiity Depth= 0.73*NDE + 8.16 Sy,x = 19.27 N = 37, R= 0.53 20510.1 No (see PDA = 0.82*NDE + 2.83 Sy,x = Gire PWSGG +PointŽ Rev. 7 Expansion Transitions U-bends 111524) GMOA 6.98 N = 37, R= 0.88 Length= 1.01*NDE + 0.16 Sy,x = 0.26 N = 37, R= 0.89 GircPWSGG +PointŽ 96511.2 See "Axial PWSGG" section of this table Rev. 16 Depth= 0.84*NDE + 10.32 Sy,x = 9.56 N = 16, R= 0.92 96701.1 Dents/Dings and No (see PDA = 1.01 *NDE + 8.55 Sy,x = GircPWSGG +PointŽ Rev. 12 Expansion Transitions ubesheet 111524) GMOA 7.53 N = 16, R= 0.90 Length= 0.91*NDE + 0.22 Sy,x = 0.15 N = 16, R= 0.97 Gire PWSGG +PointŽ 99997.2 See "Axial PWSGG" section of this table High Freq Rev. 10 Wear Tube to Tube 13901.1 Depth= 1.04*NDE -0.91 Sy,x Wear +PointŽ Rev. 1 Freespan tube-to-tube wear U-bends Yes GMOA = 1.50 N = 40 R= 1.0 Dented/non-10908.4 dented Supports, Depth = f.06*NDE + 0.13 Sy,x Wear +PointŽ Rev. 1 AVBs Foreign object Yes GMOA = 3.78 wear (part N = 49, R = 0.99 present) Foreign +PointŽ 27901 Foreign object wear (part not Volumetric See latest revision of specific Object Wear or .115 hrough Freespan Wear Yes GMOA (Note 1) Pancake present) (part not present) ETSS (10.b] Pitting 21998.1 Depth= 1.02*NDE + 5.81 Sy,x Pitting +PointŽ Rev. 4 olumetric in freespan Sludge Pile Yes GMOA = 6.28 N = 63, R= 0.94 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Degradation EPRI Demonstrated Applicability Detection? izing? POD Sizing Parameters Mechanism ETSS licabilitv Specialty Probes PDA = 0.38*NDE +35.92 Sy,x Both: CMOA = 14.92 N = 26 R = 0.42 lA.xial ODSCC !Ghent 20407.1 Support structures & freespan None Yes (Note2) Rev. 7 (PDA and Length Length = 0.33*NDE +0.36 Sy,x Only) = 0.13 N = 26 R = 0.48 Ghent 205081 CMOA Length -2.08*NDE -0.29 Sy,x Axial PWSCC Expansion Transitions None Yes = 0.15 (Note 2) Rev. 6 (Length Onlvl N = 32 R = 0.8 Axial PWSCC Ghent 20509.1 Dented support structures None Yes Not qualified (Note2) Rev. 5 Depth -0.55*NDE +35.18 Sy,x = 24.02 N = 22 R = 0.52 Depth: CMOA Length= 1.81*NDE -0.07 Sy,x Ghent 120406.1 h"op of tubesheet & expansion PDA: CMOA = 0.54 CircODSCC None Yes (Note 2) Rev. 7 ransitions N=22 R=0.78 Length: CMOA PDA = 1.34*NDE +13.72 Sy,x = 23.98 N = 22 R = 0.58 Depth -0.9*NDE +1.91 Sy,x 13.43 N=21 R=0.79 Length = 0.8*NDE +0.34 Sy,x lcirc PWSCC Ghent 20507.1 Expansion Transitions None Yes CMOA = 0.27 (Note2) Rev. 6 N=21 R=0.79 PDA = 0.99*NDE +4.64 Sy,x = 6.37 N = 21 R = 0.87 Multiple ETSSs are available for depth sizing of foreign object wear, each depending on the shape of the wear scar and the coil being used. If foreign object wear (with no part present) is reported, an appropriate +PointŽ or pancake coil technique will be selected for performing CMOA. The associated NOE uncertainties and CMOA limits will be documented in the CMOA report. The Ghent probe will only be used if needed for clarification of the eddy current response or for additional sizing information associated with unusual or unexpected indications. In lieu of the stated ETSS slope, a slope value of 1.0 will be conservatively assumed for integrity assessment. The sizing performance of ETSS H-21410.1 with respect to circumferential depth profiling of ODSCC is described by EPRI TR-107197-Pl, which utilized the same sizing methodology as ETSS H-21410.1. The performance parameters are as follows: Depth= l .O*NDE, Sy,x = 13.8; PDA = 1.05 *NOE -0.011, Sy,x = 13 .43 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 9-1: Inspection Scope Summary -Wear Damage Location E/P Probe/ ETSS Scope Expansion I Comments Mech. D/S !Wear E/D/S Bobbin I 100% bobbin except row 1-3 u-bends. +Point all new wear, all wear <:40% TW, all bobbin Egg crates 96004.1 I-codes DBNS E/D/S +Point 10908.4 100% +Point row 1-3 u-bends. P(SCC)/ +Point/ +Point all eggcrate wear, and 25% of DBNS wear not If SCC is coincident with significant DBNS wear, then previously inspected, in order to detect any sec coincident +Point all DBNS wear in the affected SG. In-situ testing D (see sec sections) with wear. Will be required per CDME-07-119 Dented VS/DB (:5 EID Bobbin I 100% bobbin except row 1-3 u-bends. Identifies coincident +Point all bobbin I-codes and all bobbin indications 5Vpp) 96004.1 wear and denting (see [3.e]) pf coincident wear and denting E/D/S +Point 10908.4 100% +Point row 1-3 u-bends, plus all bobbin indications of K;oincident wear and denting. (see CDME-07-119) Dented VS/DB (> +Point 10908.4 Apply this technique to all VS/DB dents >5Vpp reported by If wear cannot be sized (depth or voltage), then in-situ 5Vpp) E/D/S bobbin probe to ensure detection and sizing 1,esting will be required of wear (see CDME-07-119) Tube to Tube E/D/S Bobbin I 100% bobbin except row 1-3 u-bends. +Point all new wear, +Point all bobbin I-Codes Contact Wear 13091.1 +Point 13901.1 +Point row 1-3 u-bends. E/D/S +Point highest eggcrate through the square bend for the tubes surrounding R99 C140 in SGB E/D Bobbin I 100% bobbin and FOSAR both SGs. +Point all bounding tubes with loose part wear or loose Loose Part Wear 27091.2 part indication or visually detected loose part +Point 27901-127901 thru 27907 when loose part not present (CMOA) E/D/S 27907 10908.4 10908.4 when loose part present (CM)

Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 9-2: Inspection Scope Summary -Axial ODSCC/PWSCC Damage Location E/P Probe/ ETSS Scope Expansion I Comments Mech. DIS Axial EID Bobbin I 100% bobbin except row 1-3 u-bends. +Point all bobbin I-Codes ODSCC Non-dented and 128413 5 2Vpp Dented +Point I Eggcrates DBNS EID 128425 +Point inspection of all bobbin I-Codes for ODSCC detection Freespan E/S +Point I +Point depth and length sizing of detected ODSCC 128432 +Point Row 1-+Point I 3 U-bends P/D/S 10411.1 100% +Point row 1-3 u-bends. +Point sizing of any low row indications. Freespan Ding E/D 5 5Vpp Bobbin I 100% bobbin except row 1-3 u-bends. +Point all bobbin I-Codes 24013.1 E/D/S +Point I +Point inspection of bobbin I-Codes at dinged freespan locations for 22401.1 ODSCC detection, and length sizing of detected ODSCC. Freespan Ding >5Vpp E/D/S +Point I +Point inspection to detect and length size axial ODSCC at dinged and dented locations. Dented >2Vpp Eggcrates DBNS Sludge Pile and EID +Point I +Point 100% H/L TTS +3" to 13.5" below the bottom of the expansion +Point 100% of region in affected SG; ensure 20% 128424 ransition; +Point inspection of cold leg bobbin I-Codes inspected in the other SG Exp Transition E/S +Point I +Point inspection for depth and length sizing of detected Axial 128431 ODSCC indications at the sludge pile and expansion transitions. fll.xial E/D/S +Point I (MR) Row 1-3 U-96511.2 100% +Point Row 1-3 u-bends If SCC is detected in row 3, then inspect all u-bends in row 4 PWSCC bends +Point I (HF) Pf the affected SG, and 20% of row 4 in the unaffected SG. E/D/S 99997.2 Dented Eggcrates P/D/S +Point I +Point all >2Vpp dents at structures and dings >5Vpp in If an indication is detected, then a scope expansion will be DBNS 96703.1 '°reespan; +Point inspection of bobbin I-Codes determined based on the dent voltage and significance of the Dinged indication. Freespan Tubesheet and +Point I +Point 100% H/L TTS +3" to 13.5" below the bottom of the +Point 100% of region in affected SG; ensure 20% Exp Transition E/D/S 20511.1 transition; +Point 1inspected in the other SG inspection of cold leQ bobbin I-Codes Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 9-3: Inspection Scope Summary -Circumferential ODSCC/PWSCC Damage Location E/P Probe/ ETSS Scope Expansion I Comments Mech. DIS Row 1-3 U-P/DIS +Point I 22842.1 & 100% +Point row 1-3 u-bends If sec is detected in row 3, then inspect all u-bends in row 4 Gire ODSCC bends 21410.1 of the affected SG, and 20% of row 4 in the unaffected SG Dented Eggcrates PIDIS +Point I 22842.1 & +Point all >2Vpp dents at structures and dings >5Vpp If an indication is detected, then a scope expansion will be DBNS 21410.1 in freespan; +Point inspection of bobbin I-Codes; determined based on the dent voltage and significance of Dinged the circumferential indication Freespan TTS and +Point I +Point 100% HIL TIS +3" to 13.5" below the bottom of the Expansion EIDIS 21410.1 expansion transition; +Point inspection of cold Transition leQ bobbin I-Codes +Point 100% of region in affected SG; ensure 20% Expansion +Point I EPRI TR-inspected in the other SG Transition EIS 107197-P1 Sizing of circumferential indications per EPRI TR-107197-P1 Circ PID +Point (MR) I 100% +Point row 1-3 u-bends Row 1-3 U-96511.2 If SCC is detected in row 3, then inspect all LI-bends in row 4 PWSCC bends of the affected SG, and 20% of row 4 in the unaffected SG +Point (HF) I PID Dented PID +Point I +Point all >2Vpp dents at structures and dings >5Vpp in Eggcrates 111524 'reespan; +Point inspection of bobbin I-Codes If an indication is detected, then a scope expansion will be DBNS. Dinged +Point I determined based on the dent voltage and significance of PIS Sizing of circumferential PWSCC the circumferential indication Freespan 96701.1 PID +Point I 100% +Point row 1-3 u-bends Row 1-3 U-111524 If sec is detected in row 3, then inspect all LI-bends in row 4 bends +Point I of the affected SG, and 20% of row 4 in the unaffected SG PIS 120510.1 Sizing of u-bend circumferential PWSCC EID +Point I TIS and Exp 111524 +Point 100% HIL TIS + 3" to 13. 5" below the bottom of the +Point 100% of region in affected SG; ensure 20% Transition +Point I expansion transition; +Point inspection of cold leg inspected in the other SG EIDIS bobbin I-Codes 96701.1 Steam Generator Degradation Assessment for Palisades 1 R25 Inspection, Spring 2017 Table 9-4: Inspection Scope Summary -Pitting Damage Location E/P Probe/ ETSS Scope Expansion I Comments Mech. D/S Pitting Sludge Pile P/D Bobbin I 100% bobbin exam of the region +Point all bobbin I-Codes 96005.2 P/S +Point I +Point sizing of detected pitting

-2 -

SUBJECT:

SUMMARY OF CONFERENCE CALL WITH PALISADES NUCLEAR PLANT REGARDING THE SPRING 2017 STEAM GENERATOR INSPECTIONS (CAC NO. MF9396) DATED JUNE 14, 2017 DISTRIBUTION: PUBLIC LPL3 r/f RidsAcrsAcnw_MailCTR Resource RidsNrrDorlLpl3 Resource RidsNrrPMPalisades Resource RidsNrrDorlDprResource RidsNrrLASRohrer Resource MHolmberg, Riii RidsRgn3MailCenter Resource PKlein, NRR AJohnson, NRR EDuncan, Riii AHuyn, NRR ADAMS Accession Nos. PKG ML 17166A504 Summary ML 17160A181 Attachment ML 17166A497 OFFICE N RR/DORL/LPL3/PM NAME JRankin DATE 6/12/2017 OFFICE NRR/DORL/LPL3/BC NAME DWrona DATE 6/13/2017 N RR/DORL/LPL3/LA SRohrer 6/12/2017 NRR/DORL/LPL3/PM JRankin 6/14/2017 OFFICIAL RECORD COPY *via memo NRR/DE/ESGB/BC(A)* AJohnson 5/31/2017