ML17166A497

Teleconference, Meeting Material for Steam Generator Tube Inspection Tube Inspection Discussion During Palisades 2017(1R25) Outage (Preliminary Information)

ML17166A497
Person / Time
Site:	Palisades
Issue date:	05/04/2017
From:	Entergy Nuclear Operations
To:	Jennivine Rankin Plant Licensing Branch III
Rankin J, NRR/DORL/LPL3, 415-1530
Shared Package
ML17160A181	List: ML17166A497
References
CAC MF9396
Download: ML17166A497 (22)

Text

1 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 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br />

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 (1R25).

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 Palisades 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 I28432 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 I28432. The regression slope and standard error of regression are retained. Only the intercept parameter is changed. This provides an across the board reduction of NDE 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 NDE maximum depths.

The deviation was implemented in the 2012 (1R22) 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, U-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.

2 Full length ECT bobbin coil examination of all in-service tubes (except row 1, 2, and 3 U-bends) in both SGs.

ECT +Point' coil examinations (both SGs):

100% of rows 1, 2, and 3 U-bends.

100 examination of in-service freespan ding (DNG) 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 1R24 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 (DDI), Differential Freespan Indication (DFI), Distorted Support Plate Indication (DSI), Distorted Tubesheet Indication (DTI), Loose Part Indication (LPI) and Non-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 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 /> SG Location Type Number Indications Number Tubes Integrity Acceptable A

TSH Axial ODSCC 12 10 YES

3 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 0*

0*

N/A A

Freespan Axial ODSCC 0*

0*

N/A B

Tube Supports Axial ODSCC 0*

0*

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.

SG A

• Axial ODSCC at TSH

• 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

4

• Circ 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

5 SG B

• Axial ODSCC at TSH

• 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 Freespan 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.

6. Describe repair/plugging plans.

6 Currently there are 15 potential tubes requiring tube plugging in SG E-50A and 3 potential tubes in SG E-50B.

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 164 PLP Calls in 136 Tube Locations E-50B 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.

Indications of tube damage associated with the loose parts

7 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

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 The following is the primary to secondary leak trend for the last fuel cycle Note: Units in gallons per day

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Table 8-1: Eddy Current technique Table Degradation Mechanism Probe Type EPRI ETSS Demonstrated Applicability Extended Applicability Detection?

Sizing?

POD Sizing Parameters BOBBIN Tube to Tube Wear Bobbin 13091.1 Rev. 0 Freespan tube-to-tube wear None Yes CMOA Depth = 0.94*NDE + 1.24 Sy,x

= 1.57 N = 40 R= 1.0 Axial ODSCC Bobbin I28413 Rev. 3 Freespan (excluding u-bend),

eggcrate, sludge pile, & broached TSPs with or without dents 2Vpp None Yes No POD: Log-Logistic Slope = 4.296 Intercept = -5.679 Axial ODSCC Bobbin 24013.1 Rev. 2 Freespan including dings 5V None Yes No Foreign Object Wear Bobbin 27091.2 Rev. 1 Foreign object wear (part not present); I-690 tubing Extended for I-600 tubing Yes CMOA Depth = 0.79*NDE + 12.85 Sy,x

= 13.49 N = 271 R= 0.8 Support Wear Bobbin 96004.1 Rev. 13 AVBs, TSPs, vertical and diagonal straps Dents <5V Yes CMOA Depth = 0.98*NDE + 2.89 Sy,x

= 4.19 N = 76, R = 0.98 Pitting Bobbin 96005.2 Rev. 9 Freespan in the presence of copper Sludge Pile Yes CMOA Depth = 0.27*NDE + 28.42 Sy,x

= 13.36 N = 62, R = 0.41 Axial ODSCC Axial ODSCC

+Point' I28424 TSP (with or without dents

<=2vpp) and sludge pile None Yes Depth: CMOA POD: Log-Logistic Slope = 11.4155 Intercept = -17.7154 Depth = 0.9994*NDE + 0.4998 Sy,x = 11.856 N = 589, R = 0.88 Rev. 3 (detect);

I28431 BED: CMOA BED = 0.9941*NDE + 2.7324 Sy,x = 10.685 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 1R25 Inspection, Spring 2017 Degradation Mechanism Probe Type EPRI ETSS Demonstrated Applicability Extended Applicability Detection?

Sizing?

POD Sizing Parameters Axial ODSCC

+Point' I28425 Freespan (excluding u-bend),

None Yes Depth: CMOA POD: Log-Logistic Depth = 1.0069*NDE + 0.3736 Sy,x = 12.329 N = 676, R = 0.862 Rev. 3 (detect)

BED = 0.972*NDE + 3.698 eggcrate, & broached TSPs with or BED: CMOA Slope = 6.7176 Sy,x = 12.153 I28432 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 Axial ODSCC

+Point' 10411.1 Rev. 0 Low Row U-bends Higher Row U-bends Yes CMOA Depth =1.16*NDE -10.4 Sy,x = 19.02 N=17, R=0.69 Axial ODSCC

+Point' 21409.1 Rev. 7 Support structures, freespan, sludge pile, & tubesheet crevice U-bends Yes PDA: Information Length: Information PDA = 0.3*NDE +26.49 Sy,x =

18.14 N = 9 R = 0.36 Length = 1.14*NDE +0.03 Sy,x

= 0.21 N = 9 R = 0.94 Axial ODSCC

+Point' 22401.1 Rev. 4 Dented TSPs Freespan dings &

dented eggcrates, diagonal bars and vertical straps Yes Depth: Information Length: CMOA Depth = 0.13*NDE + 74.55 Sy,x

= 14.44 N = 22, R = 0.13 Length = 0.74*NDE + 0.27 Sy,x

= 0.27 N = 22, R = 0.62 Axial PWSCC Axial PWSCC

+Point' 20511.1 Rev. 8 Expansion Transitions Tubesheet Yes Depth: CMOA PDA: Information Length: CMOA Depth = 0.68*NDE + 14.45 Sy,x

= 12.44 N = 33, R= 0.64 PDA = 0.21*NDE + 28.77 Sy,x

= 7.95 N = 32, R= 0.33 Length =1.10*NDE - 0.01 Sy,x

= 0.13 N = 32, R= 0.87

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Degradation Mechanism Probe Type EPRI ETSS Demonstrated Applicability Extended Applicability Detection?

Sizing?

POD Sizing Parameters Axial PWSCC

+Point' 96703.1 Rev. 17 Dents/Dings Tubesheet, Dented supports Yes Depth: CMOA Length: CMOA Depth = 0.90*NDE + 7.56 Sy,x

= 15.28 N = 46, R= 0.81 Length =1.00*NDE + 0.13 Sy,x

= 0.28 N = 46, R= 0.91 Axial PWSCC

+Point' 96511.2 Rev. 16 Low Row U-bends Higher Row U-bends Yes CMOA Depth = 0.56*NDE + 19.06 Sy,x

= 14.97 N = 24, R= 0.66 Axial PWSCC

+Point' High Freq 99997.2 Rev. 10 Low Row U-bends Higher Row U-bends Yes CMOA Depth = 0.95*NDE - 5.61 Sy,x

= 10.50 N = 24, R= 0.85 Circ ODSCC Circ ODSCC

+Point' 21410.1 Rev. 6 Note 4 Expansion Transitions U-bends, freespan dings, dented supports Yes Depth: Information PDA: CMOA Length: Not usable Depth = 0.13*NDE +60.10 Sy,x

= 24.50 N = 40, R= 0.14 PDA = 1.02*NDE +21.84 Sy,x

= 23.58 N = 38 R = 0.47 Length = 1.24*NDE +0.42 Sy,x

= 0.69 N = 38 R = 0.69 Circ ODSCC

+Point' 22842.1 Rev. 4 Dented Supports Freespan dings, u-bends Yes CMOA (Note 3)

Length = 0.52*NDE + 0.03 Sy,x

= 0.26 N = 18, R= 0.75 Circ PWSCC Circ PWSCC

+Point' I11524 Rev. 0 Expansion Transitions U-bends, Dents/Dings, Tubesheet Yes No POD: Log-Logistic Slope = -20.522 Intercept = 13.733

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Degradation Mechanism Probe Type EPRI ETSS Demonstrated Applicability Extended Applicability Detection?

Sizing?

POD Sizing Parameters Circ PWSCC

+Point' 20510.1 Rev. 7 Expansion Transitions U-bends No (see I11524)

CMOA Depth = 0.73*NDE + 8.16 Sy,x

19.27 N = 37, R= 0.53 PDA = 0.82*NDE + 2.83 Sy,x

6.98 N = 37, R= 0.88 Length = 1.01*NDE + 0.16 Sy,x

= 0.26 N = 37, R= 0.89 Circ PWSCC

+Point' 96511.2 Rev. 16 See Axial PWSCC section of this table Circ PWSCC

+Point' 96701.1 Rev. 12 Expansion Transitions Dents/Dings and tubesheet No (see I11524)

CMOA Depth = 0.84*NDE + 10.32 Sy,x

9.56 N = 16, R= 0.92 PDA = 1.01*NDE + 8.55 Sy,x

7.53 N = 16, R= 0.90 Length = 0.91*NDE + 0.22 Sy,x

= 0.15 N = 16, R= 0.97 Circ PWSCC

+Point' High Freq 99997.2 Rev. 10 See Axial PWSCC section of this table Wear Tube to Tube Wear

+Point' 13901.1 Rev. 1 Freespan tube-to-tube wear U-bends Yes CMOA Depth = 1.04*NDE -0.91 Sy,x

= 1.50 N = 40 R= 1.0 Wear

+Point' 10908.4 Rev. 1 AVBs Dented/non-dented Supports, Foreign object wear (part present)

Yes CMOA Depth = 1.06*NDE + 0.13 Sy,x

= 3.78 N = 49, R = 0.99 Foreign Object Wear (Note 1)

+Point' or.115 Pancake 27901 through 27907 Foreign object wear (part not present)

Volumetric Freespan Wear (part not present)

Yes CMOA See latest revision of specific ETSS [10.b]

Pitting Pitting

+Point' 21998.1 Rev. 4 Volumetric in freespan Sludge Pile Yes CMOA Depth = 1.02*NDE + 5.81 Sy,x

= 6.28 N = 63, R= 0.94

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Degradation Mechanism Probe Type EPRI ETSS Demonstrated Applicability Extended Applicability Detection?

Sizing?

POD Sizing Parameters Specialty Probes Axial ODSCC Ghent (Note 2) 20407.1 Rev. 7 Support structures & freespan None Yes Both: CMOA (PDA and Length Only)

PDA = 0.38*NDE +35.92 Sy,x

= 14.92 N = 26 R = 0.42 Length = 0.33*NDE +0.36 Sy,x

= 0.13 N = 26 R = 0.48 Axial PWSCC Ghent (Note 2) 20508.1 Rev. 6 Expansion Transitions None Yes CMOA (Length Only)

Length = 2.08*NDE -0.29 Sy,x

= 0.15 N = 32 R = 0.8 Axial PWSCC Ghent (Note 2) 20509.1 Rev. 5 Dented support structures None Yes Not qualified Circ ODSCC Ghent (Note 2) 20406.1 Rev. 7 Top of tubesheet & expansion transitions None Yes Depth: CMOA PDA: CMOA Length: CMOA Depth = 0.55*NDE +35.18 Sy,x

= 24.02 N = 22 R = 0.52 Length = 1.81*NDE -0.07 Sy,x

= 0.54 N = 22 R = 0.78 PDA = 1.34*NDE +13.72 Sy,x

23.98 N = 22 R = 0.58 Circ PWSCC Ghent (Note 2) 20507.1 Rev. 6 Expansion Transitions None Yes CMOA Depth = 0.9*NDE +1.91 Sy,x

13.43 N = 21 R = 0.79 Length = 0.8*NDE +0.34 Sy,x

0.27 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 +Point' or pancake coil technique will be selected for performing CMOA.

The associated NDE 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-P1, which utilized the same sizing methodology as ETSS H-21410.1. The performance parameters are as follows: Depth = 1.0*NDE, Sy,x = 13.8; PDA =

1.05*NDE - 0.011, Sy,x = 13.43

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Table 9-1: Inspection Scope Summary - Wear Damage Mech.

Location E/P D/S Probe / ETSS Scope Expansion / Comments Wear Eggcrates DB/VS E/D/S Bobbin /

96004.1 100% bobbin except row 1-3 u-bends.

+Point all new wear, all wear 40%TW, all bobbin I-codes E/D/S

+Point 10908.4 100% +Point row 1-3 u-bends.

P(SCC)/

D

+Point /

(see SCC sections)

+Point all eggcrate wear, and 25% of DB/VS wear not previously inspected, in order to detect any SCC coincident with wear.

If SCC is coincident with significant DB/VS wear, then

+Point all DB/VS wear in the affected SG. In-situ testing will be required per CDME-07-119 Dented VS/DB (

5Vpp)

E/D Bobbin /

96004.1 100% bobbin except row 1-3 u-bends. Identifies coincident wear and denting (see [3.e])

+Point all bobbin I-codes and all bobbin indications of coincident wear and denting E/D/S

+Point 10908.4 100% +Point row 1-3 u-bends, plus all bobbin indications of coincident wear and denting. (see CDME-07-119)

Dented VS/DB (>

5Vpp)

E/D/S

+Point 10908.4 Apply this technique to all VS/DB dents >5Vpp reported by bobbin probe to ensure detection and sizing of wear (see CDME-07-119)

If wear cannot be sized (depth or voltage), then in-situ testing will be required Tube to Tube Contact Wear E/D/S Bobbin /

13091.1 100% bobbin except row 1-3 u-bends.

+Point all new wear, +Point all bobbin I-Codes E/D/S

+Point 13901.1

+Point row 1-3 u-bends.

+Point highest eggcrate through the square bend for the tubes surrounding R99 C140 in SGB Loose Part Wear E/D Bobbin /

27091.2 100% bobbin and FOSAR both SGs.

+Point all bounding tubes with loose part wear or loose part indication or visually detected loose part E/D/S

+Point 27901-27907 10908.4 27901 thru 27907 when loose part not present (CMOA) 10908.4 when loose part present (CM)

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Table 9-2: Inspection Scope Summary - Axial ODSCC/PWSCC Damage Mech.

Location E/P D/S Probe / ETSS Scope Expansion / Comments Axial ODSCC Non-dented and 2Vpp Dented Eggcrates DB/VS Freespan E/D Bobbin /

I28413 100% bobbin except row 1-3 u-bends.

+Point all bobbin I-Codes E/D

+Point /

I28425

+Point inspection of all bobbin I-Codes for ODSCC detection E/S

+Point /

I28432

+Point depth and length sizing of detected ODSCC

+Point Row 1-3 U-bends P/D/S

+Point /

10411.1 100% +Point row 1-3 u-bends.

+Point sizing of any low row indications.

Freespan Ding 5Vpp E/D Bobbin /

24013.1 100% bobbin except row 1-3 u-bends.

+Point all bobbin I-Codes E/D/S

+Point /

22401.1

+Point inspection of bobbin I-Codes at dinged freespan locations for ODSCC detection, and length sizing of detected ODSCC.

Freespan Ding

>5Vpp Dented >2Vpp Eggcrates DB/VS E/D/S

+Point /

22401.1

+Point inspection to detect and length size axial ODSCC at dinged and dented locations.

Sludge Pile and Exp Transition E/D

+Point /

I28424

+Point 100% H/L TTS +3 to 13.5 below the bottom of the expansion transition; +Point inspection of cold leg bobbin I-Codes

+Point 100% of region in affected SG; ensure 20%

inspected in the other SG E/S

+Point /

I28431

+Point inspection for depth and length sizing of detected Axial ODSCC indications at the sludge pile and expansion transitions.

Axial PWSCC Row 1-3 U-bends E/D/S

+Point / (MR) 96511.2 100% +Point Row 1-3 u-bends If SCC is detected in row 3, then inspect all u-bends in row 4 of the affected SG, and 20% of row 4 in the unaffected SG.

E/D/S

+Point / (HF) 99997.2 Dented Eggcrates DB/VS Dinged Freespan P/D/S

+Point /

96703.1

+Point all >2Vpp dents at structures and dings >5Vpp in freespan; +Point inspection of bobbin I-Codes If an indication is detected, then a scope expansion will be determined based on the dent voltage and significance of the indication.

Tubesheet and Exp Transition E/D/S

+Point /

20511.1

+Point 100% H/L TTS +3 to 13.5 below the bottom of the expansion transition; +Point inspection of cold leg bobbin I-Codes

+Point 100% of region in affected SG; ensure 20%

inspected in the other SG

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Table 9-3: Inspection Scope Summary - Circumferential ODSCC/PWSCC Damage Mech.

Location E/P D/S Probe / ETSS Scope Expansion / Comments Circ ODSCC Row 1-3 U-bends P/D/S

+Point / 22842.1 &

21410.1 100% +Point row 1-3 u-bends If SCC is detected in row 3, then inspect all u-bends in row 4 of the affected SG, and 20% of row 4 in the unaffected SG Dented Eggcrates DB/VS Dinged Freespan P/D/S

+Point / 22842.1 &

21410.1

+Point all >2Vpp dents at structures and dings >5Vpp in freespan; +Point inspection of bobbin I-Codes; If an indication is detected, then a scope expansion will be determined based on the dent voltage and significance of the circumferential indication TTS and Expansion Transition E/D/S

+Point /

21410.1

+Point 100% H/L TTS +3 to 13.5 below the bottom of the expansion transition; +Point inspection of cold leg bobbin I-Codes

+Point 100% of region in affected SG; ensure 20%

inspected in the other SG Expansion Transition E/S

+Point / EPRI TR-107197-P1 Sizing of circumferential indications per EPRI TR-107197-P1 Circ PWSCC Row 1-3 U-bends P/D

+Point (MR) /

96511.2 100% +Point row 1-3 u-bends If SCC is detected in row 3, then inspect all u-bends in row 4 of the affected SG, and 20% of row 4 in the unaffected SG P/D

+Point (HF) /

99997.2 Dented Eggcrates DB/VS. Dinged Freespan P/D

+Point /

I11524

+Point all >2Vpp dents at structures and dings >5Vpp in freespan; +Point inspection of bobbin I-Codes If an indication is detected, then a scope expansion will be determined based on the dent voltage and significance of the circumferential indication P/S

+Point /

96701.1 Sizing of circumferential PWSCC Row 1-3 U-bends P/D

+Point /

I11524 100% +Point row 1-3 u-bends If SCC is detected in row 3, then inspect all u-bends in row 4 of the affected SG, and 20% of row 4 in the unaffected SG P/S

+Point /

20510.1 Sizing of u-bend circumferential PWSCC TTS and Exp Transition E/D

+Point /

I11524

+Point 100% H/L TTS +3 to 13.5 below the bottom of the expansion transition; +Point inspection of cold leg bobbin I-Codes

+Point 100% of region in affected SG; ensure 20%

inspected in the other SG E/D/S

+Point /

96701.1

Steam Generator Degradation Assessment for Palisades 1R25 Inspection, Spring 2017 Table 9-4: Inspection Scope Summary - Pitting Damage Mech.

Location E/P D/S Probe / ETSS Scope Expansion / Comments Pitting Sludge Pile P/D Bobbin /

96005.2 100% bobbin exam of the region

+Point all bobbin I-Codes P/S

+Point /

21998.1

+Point sizing of detected pitting