ML15119A104

SG-CCOE-14-4-NP, Revision 1, Examination of Steam Generator Tubes Removed, Part 1 of 4

ML15119A104
Person / Time
Site:	Beaver Valley
Issue date:	03/31/2015
From:	Magee T P Westinghouse
To:	FirstEnergy Nuclear Operating Co, Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML15119A101	List: L-15-091, SG-CCOE-14-4-NP, Revision 1, Examination of Steam Generator Tubes Removed, Part 2 of 4 ML15119A103 ML15119A104
References
L-15-091 SG-CCOE-14-4-NP, Rev. 1
Download: ML15119A104 (69)

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Enclosure A L-1 5-091 Examination of Steam Generator Tubes Removed from Beaver Valley Unit 2 (Nonproprietary Version)(202 Pages Follow)

Westinghouse Non-Proprietary Class 3 SG-CCOE-14-4-NP Revision 1 March 2015 Examination of Steam Generator Tubes Removed from Beaver Valley Unit 2 Prepared for the FirstEnergy Nuclear Operating Company Westinghouse WESTINGHOUSE NON-PROPRIETARY CLASS 3 LEGAL NOTICE This report was prepared as an account of work performed by Westinghouse Electric Company LLC. Neither Westinghouse Electric Company LLC, nor any person acting on its behalf: A. Makes any warranty or representation, express or implied including the warranties of fitness for a particular purpose or merchantability, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method, or process disclosed in this report.

WESTINGHOUSE NON-PROPRIETARY CLASS 3 iii SG-CCOE-14-4-NP Revision 1 Prepared for the FirstEnergy Nuclear Operating Company Examination of Steam Generator Tubes Removed from Beaver Valley Unit 2 Author's Name Thomas P. Magee Verifier's Name Richard J. Jacko Manager Name Dante Mincin Signature

/ Date TPM (*)Signature

/ Date RJJ (*)For Pages All For Pages All For Pages All Signature

/ Date DM (*)* Electronically Approved Records Are A uthenticated in the Electronic Document Management System Westinghouse Electric Company LLC 1000 Westinghouse Drive Cranberry Township, PA 16066© 2015 Westinghouse Electric Company LLC All Rights Reserved iv RECORD OF REVISIONS Revision Date Revision Description 0 2/19/2015 Original issue I Entered Replaced images in Figure 5-21 and Figure 5-22 with those of better in EDMS clarity. Adjusted Figure 5-20 to reflect observed cracks in Figure 5-22.Revised text in Section 5.4.3 to describe observed features in Figure 5-21 and Figure 5-22.Record of Revisions March 2015 SG-CCOE- 14-4-NP Revision I Record of Revisions SG-CCOE-14-4-NP March 2015 Revision I V TABLE OF CONTENTS Record of Revisions

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

iv Table of Contents .............................................................................................................................

v List of Tables ................................................................................................................................

vii List of Figures ..............................................................................................................................

viii 1.0 Introduction

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

1-1 1.1 Background

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

1-1 1.2 Purpose and Scope .......................................................................................................

1-2 1.3 Steam Generator Description

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

1-2 1.4 Description of the Beaver Valley Unit 2 Tubes Pulled for Examination

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

1-3 2.0 Receipt Inspection

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

2-1 2.1 Verification of Identity and Orientation

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

2-1 2.2 V isual Observations

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

2-1 2.3 D im ensional Characterization

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

2-6 3.0 Eddy Current Test Inspection

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

3-1 3.1 Introduction

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

3-1 3.2 General Laboratory Acquisition and A nalysis .............................................................

3-1 3.3 Laboratory Bobbin Probe Data Acquisition and Analysis ...........................................

3-1 3.4 Three Coil +Point Probe Data A cquisition and Analysis ............................................

3-2 3.5 Ghent Acquisition and Analysis ..................................................................................

3-2 3.6 Review of Field Data Prior to the Tube Pull Process ..................................................

3-3 3.7 ECT Conclusions

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

3-3 4.0 Deposit pH .......................................................................................................................

4-1 5.0 Leakage Screening and Burst Testing ..............................................................................

5-1 5.1 Introduction

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

5-1 5.2 Sam ple Preparation

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

5-1 5.3 Leak Screening

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

5-2 5.4 Burst Testing ................................................................................................................

5-3 6.0 Sectioning

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

6-1 7.0 SEM Fractography

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

7-1 7.1 Sam ple Preparation

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

7-1 7.2 Procedure

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

7-1 7.3 Fractography Depth Profiles ........................................................................................

7-1 7.4 Crack Surface Characterization

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

7-2 8.0 M etallography of Cracks ..................................................................................................

8-1 8.1 Procedure

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

8-1 8.2 R 19C38 02H ................................................................................................................

8-1 8.3 R24C41 02H ................................................................................................................

8-2 8.4 R24C41 03H ................................................................................................................

8-2 8.5 R24C41 04H ................................................................................................................

8-2 Table of Contents March 2015 SG-CCOE- 14-4-NP Revision I vi 9.0 M aterial Characterization

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

9-1 9.1 Tensile Test ..................................................................................................................

9-1 9.2 Bulk Chem istry ............................................................................................................

9-1 9.3 M icrostructure A nalysis ...............................................................................................

9-2 9.4 M icrohardness Testing .................................................................................................

9-3 9.5 Sensitization A ssessm ent .............................................................................................

9-4 9.6 M aterial Characterization Conclusions

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

9-5 10.0 ED S A nalysis of Surfaces and D eposits ........................................................................

10-1 10.1 SEM /ED S A nalysis of Burst O pening Surfaces ........................................................

10-1 10.2 SEM /ED S A nalysis of Spalled D eposits ...................................................................

10-2 11.0 D iscussion

/ Conclusions

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

11-1 11.1 Characterization of Corrosion

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

11-1 11.2 Characterization of Tubing M aterial ...........................................................................

11-1 11.3 Tube Integrity

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

11-1 11.4 Conclusion

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

11-2 12.0 References

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

12-1 A PPEN D IX A -Crack D epth Profile D ata .............................................................................

A -1 Table of Contents SG-CCOE- 14-4-NP March 2015 Revision I vii LIST OF TABLES Table 1-1: Table 1-2: Table 3-1 : Table 3-2: Table 5-1: Table 5-2: Table 5-3: Table 5-4: Table 6-1: Table 7-1: Table 7-2: Table 8-1: Table 8-2: Table 9- 1: Table 9-2: Table 9-3: Table 9-4: Table 10-1: Table 10-2: Table 10-3: Table 10-4: Table 10-5: Table 10-6: Table 10-7: Table 10-8: Table 11-1 : Support Plate D esign Elevations

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

1-5 A s-R eceived Lengths ...........................................................................................

1-6 E C T Sam ples .......................................................................................................

3-4 Summary of Field and Laboratory Eddy Current Inspection Results ..................

3-5 Leak and Burst Test Sam ples ...............................................................................

5-6 Pre-Leak/Burst Test Wall Thickness Measurements

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

5-6 Leak Screening R esults ........................................................................................

5-7 Burst Results and Post-Burst Measurements

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

5-7 Sectioning D iagram s ............................................................................................

6-1 Ligam ent Sizing R esults ......................................................................................

7-3 Summary of Burst Opening Depth Profiles .........................................................

7-3 D efect M etallography Sam ples ............................................................................

8-4 Maximum Crack Depth Measurement Results ....................................................

8-4 T ensile T est R esults .............................................................................................

9-6 Chemical Composition of Bulk Material .............................................................

9-7 M icrohardness Sum m ary .....................................................................................

9-8 Summary of Modified Huey Results ...................................................................

9-8 Results of EDS Analyses Performed on RI 9C3 8-02H Fracture Surfaces .........

10-4 Results of EDS Analyses Performed on R19C38-02H OD Surfaces ................

10-5 Results of EDS Analyses Performed on R24C41-04H Fracture Surface ..........

10-6 Results of EDS Analyses Performed on R24C41-04H OD Surface ..................

10-6 Results of EDS Analyses Performed on R24C41-04H OD Surface D etailed A rea .....................................................................................................

10-7 R19C38-02H Spalled TSP Deposit EDS Analysis Results ...............................

10-8 R24C41-03H Spalled TSP Deposit EDS Analysis Results ...............................

10-8 R24C41-04H Spalled TSP Deposit EDS Analysis Results ...............................

10-9 Comparison of Field Sizing and Lab Results ....................................................

11-3 List of Tables SG-CCOE- 14-4-NP March 2015 Revision I viii LIST OF FIGURES Figure 2-1: Figure 2-2: Figure 2-3: Figure 2-4: Figure 2-5: Figure 2-6: Figure 2-7: Figure 2-8: Figure 2-9: Figure 2-10: Figure 2-11: Figure 2-12: Figure 2-13: Figure 2-14: Figure 2-15: Figure 2-16: Figure 2-17: Figure 2-18: Figure 2-19: Figure 2-20: Figure 3-1: Figure 3-2: Figure 3-3: Figure 3-4: Figure 3-5: Figure 3-6: Figure 3-7: Figure 3-8: Figure 3-9: Figure 3-10: Figure 3-11: Figure 3-12: Figure 3-13: Figure 3-14: Figure 3-15: Figure 3-16: Figure 3-17: Figure 3-18: Figure 3-19: Figure 3-20: Figure 3-21: Figure 3-22: Orientation System Used in the Examination

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

2-9 As-Received Views of R19C38 TTS Region ....................................................

2-10 As-Received Views of R19C38 FDB Region ....................................................

2-11 As-Received Views of R19C38 02H TSP Region .............................................

2-12 As-Received Representative Views of R19C38 Freeespan Segment 4 .............

2-13 As-Received Views of R24C41 TTS Region ....................................................

2-14 As-Received Views of R24C41 FDB Region ....................................................

2-15 As-Received Views of R24C41 02H TSP Region .............................................

2-16 As-Received Representative Views of R24C41 Freeespan Segment 4 .............

2-17 As-Received Views of R24C41 03H TSP Region .............................................

2-18 As-Received Views of R24C41 04H TSP Region .............................................

2-19 As-Received Representative View of R24C41 Freeespan Segment 7 ...............

2-20 Diameter Profile of TTS Region of R19C38, Showing the Expansion T ran sitio n ...........................................................................................................

2-2 1 Diameter Profile of FDB Region of R19C38 ....................................................

2-22 Diameter Profile of 02H TSP Region of R19C38 .............................................

2-23 Diameter Profile of TTS Region of R24C41, Showing the Expansion T ransition

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

2-24 Diameter Profile of FDB Region of R24C41 ....................................................

2-25 Diameter Profile of 02H TSP Region of R24C41 .............................................

2-26 Diameter Profile of 03H TSP Region of R24C41 .............................................

2-27 Diameter Profile of 04H TSP Region of R24C41 .............................................

2-28 Laboratory Bobbin -R19C38-1B TSH -NDD ..................................................

3-6 Laboratory Bobbin -R19C38-3B (02H) -DSI ...................................................

3-6 Laboratory Bobbin -R24C41-1B (TSH) -NDD ................................................

3-7 Laboratory Bobbin -R24C41-3B (02H) -DNT ..................................................

3-7 Laboratory Bobbin -R24C41-5B (03H) -DNT ..................................................

3-8 Laboratory Bobbin -R24C41-6B (04H) -DNT ..................................................

3-8 Laboratory

+Point Probe -R 19C38-1B TSH -NDD ..........................................

3-9 Laboratory

+Point Probe -R19C38-3B (02H) -Bottom -SAI .........................

3-9 Laboratory

+Point Probe -R19C38-3B (02H) -Top -SAI .............................

3-10 Laboratory

+Point Probe -R24C41 -1B TSH -NDD ........................................

3-10 Laboratory

+Point Probe -R24C41-3B (02H) -NDD ......................................

3-11 Laboratory

+Point Probe -R24C41-5B (03H) -NDD .....................................

3-11 Laboratory

+Point Probe -R24C41-6B (04H) -Ligament # I -MAI ..............

3-12 Laboratory

+Point Probe -R24C41-6B (04H) -Ligament # 2 -MAI .............

3-12 Laboratory Ghent Probe -R19C38-IB TSH -NDD ........................................

3-13 Laboratory Ghent Probe -R19C38-3B (02H) -Bottom -SAI .........................

3-13 Laboratory Ghent Probe -R19C38-3B (02H) -Top -SAI ...............................

3-14 Laboratory Ghent Probe- R24C41-1B TSH -NDD ........................................

3-14 Laboratory Ghent Probe -R24C41-3B (02H) -NDD ......................................

3-15 Laboratory Ghent Probe -R24C41-5B (03H) -NDD ......................................

3-15 Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # I -MAI ..............

3-16 Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # 2 -MAI ..............

3-16 List of Figures March 2015 SG-CCOE- 14-4-NP Revision 1 List of Figures SG-CCOE-14-4-NP March 2015 Revision I ix Figure 3-23: Figure 3-24: Figure 3-25: Figure 3-26: Figure 3-27: Figure 3-28: Figure 3-29: Figure 3-30: Figure 3-3 1: Figure 3-32: Figure 3-33: Figure 3-34: Figure 3-35: Figure 3-36: Figure 5-1: Figure 5-2: Figure 5-3: Figure 5-4: Figure 5-5: Figure 5-6: Figure 5-7: Figure 5-8: Figure 5-9: Figure 5-10: Figure 5-11: Figure 5-12: Figure 5-13: Figure 5-14: Figure 5-15: Figure 5-16: Figure 5-17: Figure 5-18: Figure 5-19: Figure 5-20: Figure 5-21: Figure 5-22: Figure 5-23: Figure 5-24: Figure 5-25: Figure 5-26: Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # 3 -MAI ..............

3-17 In-Generator Bobbin Probe -R19C38-1B TSH -NDD ....................................

3-17 In-Generator Bobbin Probe -R19C38-3B (02H) -DSI ...................................

3-18 In-Generator Bobbin Probe -R24C41 -1B TSH -NDD ....................................

3-18 In-Generator Bobbin Probe -R24C41-3B (0214) -DSI ...................................

3-19 In-Generator Bobbin Probe -R24C41-5B (03H) -NDD ..................................

3-19 In-Generator Bobbin Probe -R24C41-6B (04H) -DSI ....................................

3-20 In-Generator

+Point Probe -R19C38-1B TSH -NDD ....................................

3-20 In-Generator

+Point Probe -R19C38-3B (02H) -Bottom -SAI ....................

3-21 In-Generator

+Point Probe -R19C38-3B (021-I) -Top -SAI ..........................

3-21 In-Generator

+Point Probe -R24C41-1B TSH -NDD ....................................

3-22 In-Generator

+Point Probe -R24C41-3B (02H) -NDD ..................................

3-22 In-Generator

+Point Probe -R24C41-6B (04H) -Ligament # I -MAI ..........

3-23 In-Generator

+Point Probe -R24C41-6B (04H) -Ligament # 2 -MAI ..........

3-23 Burst Test Support Sim ulation .............................................................................

5-8 Burst Pressurization of R19C38-3B (02H) ..........................................................

5-9 Burst Pressurization of R19C38-4B (Freespan)

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

5-10 Burst Pressurization of R24C41-3B (02H) ........................................................

5-11 Burst Pressurization of R24C41-5B (03H) ........................................................

5-12 Burst Pressurization of R24C41-6B (04H) ........................................................

5-13 Burst Pressurization of R24C41-7B (Freespan)

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

5-14 Burst Opening at R 19C38-3B (02H) .................................................................

5-15 Burst Opening at R19C38-4B (Freespan)

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

5-16 Burst Opening at R24C41-3B (Burst in Freespan, Outside of 02H) .................

5-17 Burst Opening at R24C41-5B (Burst in Freespan, Outside of 03H) .................

5-18 Burst Opening at R24C41-6B (04H) .................................................................

5-19 Burst Opening at R24C41-7B (Freespan)

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

5-20 Post-Burst Observations on R19C38-3B (02H Region) ....................................

5-21 Short Cracks near the Bottom of the 02H TSP of R19C38 (00 Orientation)

..... 5-22 Short Cracks near the Top of the 02H TSP of R19C38 (00 Orientation)

..........

5-22 Short Cracks near the Bottom of the 02H TSP of R19C38 (2000 O rientation)

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

5-23 Post-Burst Observations on R24C41-3B (02H Region) ....................................

5-24 Shallow Corrosion Partially Obscured by Surface Deposits, Near the 00 O rientation of R24C41 02H ...............................................................................

5-25 Post-Burst Observations on R24C41-5B (03H Region) ....................................

5-26 Shallow Axial Cracks (Marked with Arrows) Near Center of R24C41 03H TSP Region (1800 O rientation)

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

5-27 Shallow Cracks at Top of R24C41 03H TSP Region (00 Orientation)

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

5-27 Post-Burst Observations on R24C41-6B (04H Region) ....................................

5-28 Larger Axial Cracks Near the Centerline of R24C41 04H TSP Region, B etw een 3350-3500

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

5-29 Larger Axial Cracks Near the Centerline of R24C41 04H TSP Region, B etw een 305'-3400

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

5-30 Example of Shallow Cracks Located Adjacent to the Burst Opening Of R24C41-6B (04H) at the 900 Orientation

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

5-31 List of Figures SG-CCOE- 14-4-NP March 2015 Revision I X Figure 6-1: Figure 6-2: Figure 6-3: Figure 6-4: Figure 6-5: Figure 6-6: Figure 6-7: Figure 6-8: Figure 6-9: Figure 6-10: Figure 6-11: Figure 6-12: Figure 6-13: Figure 6-14: Figure 6-15: Figure 6-16: Figure 6-17: Figure 6-18: Figure 6-19: Figure 6-20: Figure 6-2 1: Figure 6-22: Figure 6-23: Figure 6-24: Figure 6-25: Figure 6-26: Figure 6-27: Figure 7-1: Figure 7-2: Figure 7-3: Figure 7-4: Figure 7-5: Figure 7-6: Figure 7-7: Figure 7-8: Figure 7-9: Figure 8-1: Figure 8-2: Figure 8-3: Figure 8-4: Figure 8-5: Figure 8-6: Sectioning Diagram for R19C38 Segment 1 .......................................................

6-2 Sectioning Diagram for R19C38 Segment 2 .......................................................

6-3 Sectioning Diagram for R19C38 Segment 3 .......................................................

6-4 Sectioning Diagram for R19C38 Section 3A .......................................................

6-5 Sectioning Diagram for R19C38 Section 3B .......................................................

6-6 Sectioning Diagram for R19C38 Section 3B2 .....................................................

6-7 Sectioning Diagram for R19C38 Segment 4 .......................................................

6-8 Sectioning Diagram for R19C38 Section 4A .......................................................

6-9 Sectioning Diagram for R 19C38 Section 4B .....................................................

6-10 Sectioning Diagram for R19C38 Section 4B2 ...................................................

6-11 Sectioning Diagram for R24C41 Segment I .....................................................

6-12 Sectioning Diagram for R24C41 Segment 2 .....................................................

6-13 Sectioning Diagram for R24C41 Segment 3 .....................................................

6-14 Sectioning Diagram for R24C41 Section 3A .....................................................

6-15 Sectioning Diagram for R24C41 Section 3B .....................................................

6-16 Sectioning Diagram for R24C41 Section 3B4 ...................................................

6-17 Sectioning Diagram for R24C41 Segment 4 .....................................................

6-18 Sectioning Diagram for R24C41 Segment 5 .....................................................

6-19 Sectioning Diagram for R24C41 Section 5B .....................................................

6-20 Sectioning Diagram for R24C41 Section 5B4 ...................................................

6-21 Sectioning Diagram for R24C41 Segment 6 .....................................................

6-22 Sectioning Diagram for R24C41 Section 6B .....................................................

6-23 Sectioning Diagram for R24C41 Section 6B2 ...................................................

6-24 Sectioning Diagram for R24C41 Segment 7 .....................................................

6-25 Sectioning Diagram for R24C41 Section 7A .....................................................

6-26 Sectioning Diagram for R24C41 Section 7B .....................................................

6-27 Sectioning Diagram for R24C41 Section 7B2 ...................................................

6-28 SEM Photomontage of R19C38-3B (02H) Burst Opening ..................................

7-4 SEM Photomontage of R24C41-6B (04H) Burst Opening ..................................

7-5 R19C38-3B (02H) Burst Opening Depth Profile .................................................

7-6 R24C41-6B (04H) Burst Opening Depth Profile .................................................

7-7 Example of RI 9C38-3B Burst Opening Fracture Surface (Near Top End o f C rack) ..............................................................................................................

7-8 Example of RI 9C38-3B Burst Opening Fracture Surface (Center of C rack ) ...................................................................................................................

7 -9 OD Surface of R19C38 02H, Adjacent to Burst Opening (Axial Direction is H orizontal)

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

7-10 Example of R24C41-6B Burst Opening Fracture Surface .................................

7-11 OD Surface of R24C41 04H, Adjacent to Burst Opening (Axial Direction is H orizontal)

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

7-12 R19C38 02H -Overall View of Transverse Section ...........................................

8-5 R19C38 02H, Transverse Section: Cracks at 2000 ..............................................

8-6 R19C38 02H, Transverse Section: Crack at 3400 ................................................

8-6 R24C41 02H -Overall View of Transverse Section ...........................................

8-7 R24C41 02H, Transverse Section: Cracks at 200 ................................................

8-8 R24C41 02H, Transverse Section: Cracks at 1600 ..............................................

8-8 List of Figures SG-CCOE- 14-4-NP March 2015 Revision I Xi Figure 8-7: Figure 8-8: Figure 8-9: Figure 8-10: Figure 8-11: Figure 8-12: Figure 8-13: Figure 8-14: Figure 8-15: Figure 8-16: Figure 8-17: Figure 8-18: Figure 9-1: Figure 9-2: Figure 9-3: Figure 9-4: Figure 9-5: Figure 9-6: Figure 9-7: Figure 9-8: Figure 10-1: Figure 10-2: Figure 10-3: Figure 10-4: Figure 10-5: Figure 10-6: Figure 10-7: Figure 10-8: Figure 10-9: Figure 10-10: Figure 10-11: Figure 11-1: Figure 11-2: Figure 11-3: R24C41 02H, Transverse Section: Cracks at 3.400 ..............................................

8-9 R24C41 03H -Overall View of Transverse Section .........................................

8-10 R24C41 03H, Transverse Section: Cracks at 1800 ............................................

8-10 R24C41 04H -Overall View of Transverse Section .........................................

8-11 R24C41 04H, Transverse Section: Cracks at 800 ..............................................

8-12 R24C41 04H, Transverse Section: Cracks at 400 ..............................................

8-12 R24C41 04H, Transverse Section: Cracks at 3500 ............................................

8-13 R24C41 04H, Transverse Section: Cracks at 3250 ............................................

8-13 R24C41 04H, Transverse Section: Cracks at 3050 ............................................

8-14 Cracks Further Characterized by Metallography (3050-3500)

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

8-15 R24C41 04H Crack Depth Profiles Between 3050-350.

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

8-16 R24C41 04H, Transverse Section: Crack at 3350, 20 mil Axial Location ........ 8-17 Stress-Strain Curves (Low Strain) .......................................................................

9-9 Stress-Strain C urves (A ll) ..................................................................................

9-10 General Microstructure of Tube R19C38 (Low Magnification View) ..............

9-11 General Microstructure of Tube R19C38 (Medium Magnification View) ........ 9-12 General Microstructure of Tube R19C38 (High Magnification View) .............

9-13 General Microstructure of Tube R24C41 (Low Magnification View) ..............

9-14 General Microstructure of Tube R24C41 (Medium Magnification View) ........ 9-15 General Microstructure of Tube R24C41 (High Magnification View) .............

9-16 R19C38-02H Burst Opening -Crack Area 1 for EDS Analysis .....................

10-10 R19C38-02H Burst Opening -Crack Area 2 for EDS Analysis .....................

10-10 R19C38-02H Burst Opening -Crack Area 3 for EDS Analysis .....................

10-11 R19C38-02H Burst Opening -OD Surface Area 1 for EDS Analysis ............

10-11 R19C38-02H Burst Opening -OD Surface Area 2 for EDS Analysis ............

10-12 R24C41-04H Burst Opening -Crack Area for EDS Analysis ........................

10-12 R24C41-04H Burst Opening -OD Surface Area I for EDS Analysis ............

10-13 R24C41-04H Burst Opening -OD Surface Area 2 for EDS Analysis ............

10-14 R19C38-02H Spalled Deposits -View of Surface Next to Tube ....................

10-14 R24C41-03H Spalled Deposits -View of Surface Next to Tube ....................

10-15 R24C41-04H Spalled Deposits -View of Surface Next to Tube ....................

10-15 ARC Database:

Burst Pressure vs. Volts for 7/8" OD Alloy 600 SG Tubes ..... 11-4 Detection Probability for Bobbin Coil Technique ETSS 128411 ......................

11-5 Detection Probability for +Point Technique ETSS 128424 ...............................

11-6 List of Figures SG-CCOE- 14-4-NP March 2015 Revision 1 I-1

1.0 INTRODUCTION

1.1 Background

The U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter 95-05 (GL 95-05)(Reference

1) to give guidance to licensees who may wish to request a license amendment to the plant's technical specifications, and to implement a specific type of alternate steam generator tube repair criterion (ARC). GL 95-05 is applicable specifically to outside diameter stress corrosion cracking (ODSCC) of Alloy 600 steam generator tubing at drilled-hole tube support plate (TSP) locations in Westinghouse-designed steam generators (SGs).Without the GL 95-05 ARC, plant technical specifications require that flawed tubes be removed from service by plugging or be repaired by sleeving, if the depths of the flaws exceed the repair limit. Prior to implementation of GL 95-05, the repair limit had been 40 percent through-wall

(%TW) for Beaver Valley Power Station Unit 2 (BVPS2). The GL 95-05 ARC does not set limits on the depth of ODSCC indications to ensure tube integrity margins; instead, it relies on correlating the eddy current voltage amplitude from a bobbin coil probe with the more specific measurement of burst pressure and leak rate.The GL 95-05 ARC had been approved for BVPS2 prior to the end of cycle 16 (EOC-16), but had not been implemented.

FirstEnergy Nuclear Operating Company (FENOC) had not implemented the ARC due to the relatively low number of bobbin indications at TSP locations that were confirmed by +PointTM 1 to contain axial ODSCC. The GL 95-05 ARC was implemented during the 2R 16 outage due to an increase in the number of Distorted Support Indications (DSIs) that were confirmed to contain axial ODSCC.The 2R1 7 outage (Spring 2014) represents the second application of the GL 95-05 voltage-based repair criterion to the Beaver Valley Unit 2 SGs. The analysis of the 2R1 7 outage data is reported in Reference 2.GL 95-05 notes that the licensee should remove (or pull) two steam generator tube specimens, with an objective of retrieving as many intersections as is practical (a minimum of four intersections), for each plant, either during the plant SG inspection outage that implements the voltage-based repair criteria or during an inspection outage preceding initial application of these criteria.

Due to the low voltage response of the BVPS2 DSI population, FENOC received approval from the NRC to forego the tube pull operations until 2R17 (Reference 2).During the 2R17 outage, FENOC removed two tubes for laboratory examination, each containing a TSP location with confirmed axial ODSCC. Two other TSP locations without confirmed axial ODSCC were included.

These tubes were sent to the Westinghouse Churchill Site (WCS) to complete the laboratory examination.

I +PointTM is a trademark of Zetec, Inc.Introduction March 2015 SG-CCOE- 14-4-NP Revision I 1-2 1.2 Purpose and Scope The purpose of pulling the tubes was to provide samples for laboratory testing and examinations.

The laboratory testing and examinations performed at Westinghouse provided information in support of the GL 95-05 requirements for the voltage-based ARC for axial ODSCC (Reference

1) and approved industry recommendations related to GL 95-05 (Reference 3). The examinations were initiated by FENOC Task Authorization 47320244 (Reference

4) and followed the program of examinations (Reference

5) that was tailored to meet requirements.

The examination program included: " Visual Observations and Photography of As-Received Tubes" Review of Field NDE* Laboratory Eddy Current Testing (ECT)* Dimensional Characterization

• Leak Testing" Burst Testing" Post Burst Examinations" Scanning Electron Microscopy and Energy Dispersive Spectroscopy (SEM/EDS) of Burst Openings* Defect Metallography" Tensile Testing" Bulk Chemistry Analysis* Microstructure

/ Microhardness Testing* Sensitization Testing Other examinations were conducted as well:* Measurement of Deposit pH" SEM/EDS Examination of Deposits An interim report (Reference

6) was prepared to document the leak test, burst test and morphology (SEM and defect metallography) results and conclusions in support of the 90-day GL 95-05 reporting requirement.

In addition, a report documenting eddy current test results was prepared (Reference 7).This report includes all of the information provided in these reports as well as the results of all the examinations performed on the pulled tubes. All examinations and testing presented in this report were treated as safety-related and are in accordance with the Westinghouse Quality Management System (QMS).1.3 Steam Generator Description Beaver Valley Unit 2, operated by FENOC, is a three loop Westinghouse designed pressurized water reactor located in Shippingport, PA. The plant commenced commercial operation in August 1987.Introduction March 2015 SG-CCOE-14-4-NP Revision I 1-3 The Westinghouse Model 5 1M steam generators contain 3376 heat transfer tubes per steam generator.

The tubes are mill-annealed NiCrFe Alloy 600 (Alloy 600MA) with a nominal 0.875 inch OD and 0.050 inch wall thickness.

The tubes are mounted in 21.25 inches thick (nominal)low alloy steel tubesheets.

Above the tubesheet, most tubes pass through one 0.75-inch thick carbon steel flow distribution baffle (FDB), which is referred to as TSP#1. The tubes pass through the FDB via drilled holes with a diameter of 0.973-0.988 inch.All the tubes are supported by seven 0.75-inch thick carbon steel tube support plates (TSP), referred to as TSP#2 through TSP#8. The tubes pass through the TSPs via drilled holes with a nominal diameter of 0.891 inch. The diametrical clearance between the TSPs and the tubes (0.016 inch) is considerably less than the clearance between the FDB and the tubes (>0.098 inch).Table 1-1 provides a summary of the TSP elevations (Reference 8).1.4 Description of the Beaver Valley Unit 2 Tubes Pulled for Examination Two tubes were selected by FENOC for removal and laboratory examination, based on the 2R1 7 outage eddy current examination results and GL 95-05 requirements.

Both tube selections were in the "C" steam generator (SG-C).The tube at Row 19, Column 38 (R19C38) had a 0.62 volt bobbin coil Distorted Support Indication (DSI) at the hot leg TSP#2 (02H) location.

This indication was confirmed by +Point.The tube at Row 24, Column 41 (R24C41) had a 0.47 volt bobbin coil DSI at its 04H location that was confirmed by +Point. It also had a 1.19 volt bobbin coil DSI at its 02H location that was not confirmed by +Point. The pulled tube R24C41 also had a TSP intersection without any bobbin or +Point eddy current indications (03H).No axial ODSCC indications were profiled due to their limited length and small +Point amplitudes (Reference 9).Segments from the two tubes were pulled from the hot leg primary side of the tubesheet of SG-C.Tube R19C38 was cut below 03H, pulled through the tubesheet and cut into four segments.

Tube R24C41 was cut below 05H, pulled through the tubesheet and cut into seven segments.Table 1-2 provides a summary of the segments that were delivered to the WCS laboratories.

Each segment was placed in its own individual plastic tube, labelled so as to indicate the row, column and section (segment) number. The orientation within the steam generator was also marked.As each segment was pulled through the tubesheet, it was cut at about a 450 angle so as to aid in tracing the azimuthal orientation from segment-to-segment.

A small notch was made at the bottom of most segments to indicate which end of each segment was the bottom and to indicate an azimuthal orientation reference.

For the segments from R19C38, the notch is on the side of Introduction March 2015 SG-CCOE-14-4-NP Revision I 1-4 the tube that was closest to the periphery.

For the segments from R24C41, the notch is on the side of the tube that was closest to the manway.In comparison with tubes pulled from other plants, the condition of all of the Beaver Valley Unit 2 pulled tube segments from SG-C was good. There were relatively few fresh outer surface scratches/scrapes on the outer surfaces.

No significant bends or overt diameter reductions were detected from the pulling operation.

Introduction SG-CCOE- 14-4-NP March 2015 Revision I 1-5 Table 1-1: Support Plate Design Elevations Distance Above Tube Mouth Location (inches)Tubesheet Primary Side / Cladding Surface 0 Tube End (recessed for tube-to-tubesheet weld) 0.04 Cladding-to-Tubesheet Interface (nominal, cladding thickness

> 0.15 inch) 0.25 Top-of-Tubesheet (tubesheet thickness

= 21.34 / 21.22 inches) 21.47 Center of TSP #1 (FDB) 41.55 Center of TSP #2 71.6 Center of TSP #3 122.1 Center of TSP #4 172.6 Center of TSP #5 223.1 Center of TSP #6 273.6 Center of TSP #7 324.1 Center of TSP #8 374.6 Introduction SG-CCOE-14-4-NP March 2015 Revision I 1-6 Table 1-2: As-Received Lengths Tube I Segment [ Region Within Segment Length (in)R19C38 I Tubesheet and Top of Tubesheet 25.9 2 FDB (01H) 31.8 3 TSP (02H) 25.7 4 All Freespan 32.4 R24C41 1 Tubesheet and Top of Tubesheet 24.5 2 FDB (01H) 31.2 3 TSP (02H) 27.7 4 All Freespan 33.9 5 TSP (03H) 32.9 6 TSP (04H) 32.7 7 All Freespan 35.6 Introduction SG-CCOE- 14-4-NP March 2015 Revision I 2-1 2.0 RECEIPT INSPECTION

2.1 Verification

of Identity and Orientation The two tubes were cut into a total of eleven segments (see Table 1-2) and provided to the Westinghouse Churchill Site (WCS) in Churchill, Pennsylvania.

The segments were provided in individual hard clear plastic tubes. Each segment was clearly identified with the tube row, column, section number and orientation on the clear plastic packaging.

Upon receipt of the tubes in the laboratory, Westinghouse compared labels and segment lengths of each section with tube pull operation documentation.

This confirmed that all of the intended sections had been shipped to the lab, that the laboratory personnel understood the labeling and that the orientations of the tubes were understood (up vs. down and azimuthal location).

This confirmation is documented in Reference 10.In this report, the term "segment" generally refers to one of the original eleven lengths of tubing provided to WCS, as listed in Table 1-2. The terms "section" and "piece" may be used interchangeably; each refers to a part cut from its parent tube. A "specimen" generally refers to a sample used in a specific test.The identification and traceability of sections were maintained in accordance with an established Westinghouse procedure (Reference 11). The designation of each section includes the number of the parent piece. For instance, sections 2A and 2B were cut from piece 2, and sections 2B I and 2B2 were cut from piece 2B, etc.For the laboratory examination, the orientation system was based on this bottom end notch.Segments that did not have a notch were given an identifying mark on the bottom end of the segment, at the same azimuthal orientation as on an adjacent segment. The notch was used as the 0' azimuthal reference point; all other azimuthal orientations progressed in the clockwise direction while viewing the tube from the bottom end. See Figure 2-1 for a sketch of the orientation system used in the laboratory.

This orientation system was transferred to sections that were cut from these segments by making a similar mark where possible.

Unless otherwise stated, this orientation system is used throughout this report.2.2 Visual Observations After receipt at the laboratory, segments were visually inspected to document and to identify areas of corrosion, deposits, etc. for potentially more detailed analyses.

This examination was conducted with the unaided eye and with a variable magnification stereomicroscope.

Observations about tube conditions are discussed below. The general condition of regions of interest:

top of the hot leg tubesheet (TTS or TSH), FDB and TSP regions were documented using low magnification digital photographs.

2.2.1 Tube R19C38- Segment 1 (TTS)Segment 1 contained the entire tubesheet region, the TTS, and several inches of tubing above the TTS. Segment I had the spike used in the tube pulling operation firmly Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision I 2-2 attached to the inside of the segment through its bottom end. The TTS was located 21.2-inches above the bottom end of Segment 1. The TTS was clearly evident at the elevation, above which, the surface was covered with uniform adherent black deposits; below which was a freshly scraped surface. This demarcation was evident all around the circumference of the segment.Figure 2-2 shows four views of the TTS region around the circumference of the tube.A stereomicroscope examination of the area did not identify any evidence of corrosion on the TTS region of R19C38; deposits above the TTS and scrapes below the TTS obscured a direct, unblemished view of the surface. There was no evidence of a sludge collar.Above the TTS, the tube was covered with a thin layer of uniform adherent black deposits.

There were several fresh shallow scrapes attributable to the pulling operation, which ran along most of the length of the segment, starting below the TTS and extending above the TTS. Below the TTS, the entire surface was covered with fresh shallow scrapes, typical for a pulled tube and attributable to the tube pulling operation.

There was no evidence of tube installation scratches (which are those that might be created during the manufacturing of the steam generator as a result of passing each tube through the TSPs and FDB). These would appear as narrow scrapes that were covered by deposit.2.2.2 Tube R19C38 -Segment 2 (FDB)Segment 2 was covered with a thin uniform layer of adherent black deposit.Circumferential belt polish marks (belt polishing being one of the final steps in the tube manufacturing process) were visible through the deposits in some places. There were several shallow fresh scrapes that ran most of the length of the segment, attributable to the tube pulling operation.

Tube installation scratches were not evident.Segment 2 contained the FDB region. The FDB region was not easily discemable

-owing to the relatively large diametrical clearance between the the tube and the FDB, this region differs little in appearance from freespan tubing. The FDB was located 15.3-inches above the bottom of Segment 2, and was identified by calculating its approximate location and then confirming its location by identifying features that would be associated with FDB contact. Using the elevations of the TSPs (see Table 1-1), a cut width of 0.080-inch (the width of the DeWalt cutter used to cut the segments from the parent tube during the pulling operation), and an assumption that 1/4-inch of tubing was removed when the tube-tubesheet weld was removed, the centerline of the FDB region was calculated to be 15.3 inches above the bottom of Segment 2. In the vicinity of the 15.3-inch elevation, a circumferential ridge of raised deposit was identified at the 2700 orientation, which was an unusual artifact in comparison to the rest of the tube. Presumably, the tube was not perfectly centered in the FDB hole and was closest to the FDB at the 2700 orientation, allowing for deposits to accumulate in the crevice between the tube and the FDB at that particular orientation.

The presence of the raised deposit feature confirms the calculated location of the FDB.Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision I 2-3 Figure 2-3 shows four views of the FDB region around the circumference of the tube.Raised deposits are seen at the 2700 orientation.

A stereomicroscope examination of the area did not identify any evidence of corrosion on the FDB region of R19C38; most of the tube surface was covered by a thin layer of adherent black deposit which obscured the surface.2.2.3 Tube R19C38 -Segment 3 (02H TSP)Segment 3 contained the 02H TSP region. The TSP region was easily identified by unaided visual means as a region of non-uniform deposit. The TSP was centered 13.6-inches above the bottom of Segment 3. Segment 3 was covered with a thin uniform adherent layer of black deposit, except in the region of the TSP and the area just above the TSP region. There were two shallow fresh scrapes that ran most of the length of the segment, attributable to the tube pulling operation.

Figure 2-4 shows four views of the 02H TSP region around the circumference of the tube.A stereomicroscope examination of the area did not identify any evidence of corrosion on the 02H TSP region of R19C38, although much of the surface was obscured by deposits.The top and bottom of the TSP region had raised deposits around most of the circumference.

The TSP region contained areas of raised deposits as well as bare tubing.There was a brownish-tinge to the bare tubing, extending from -270-00-90'.

The rest of the TSP region had small patches of deposits.2.2.4 Tube R19C38 -Segment 4 (All Freespan)Segment 4 was entirely freespan tubing. The entire tube was covered with a thin coat of adherent black deposits over its entire length. There were a few fresh tube pull scratches.

There were no other remarkable features on the surface of the segment. Figure 2-5 shows a representative view of Segment 4.2.2.5 Tube R24C41 -Segment 1 (TTS)Segment 1 of R24C41 contained the entire tubesheet region, the TTS, and several inches of tubing above the TTS. Segment 1 had the spike used in the tube pulling operation firmly attached to the inside of the tube through its bottom end. The TTS was located 21.1-inches above the bottom end of Segment 1. The TTS was clearly evident as the elevation above which were adherent black deposits and below which was a freshly scraped surface, all around the circumference of the segment. This demarcation was evident all around the circumference of the segment.Above the TTS, the black adherent deposits were heaviest around the 2250 orientation; belt polish marks were not evident. On other parts of the circumference, the deposits were thinner and belt polish marks could be seen.Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-4 Figure 2-6 shows four views of the TTS region around the circumference of the tube. In the photos, the yellow color is attributed to the light source. The reddish regions are rust-colored deposits.

Since these rust-colored deposits are located within fresh scratches, it is concluded that they were introduced to the tube surface by the tube pulling operation.

A stereomicroscope examination of the area did not identify any evidence of corrosion on the TTS region of R24C41. There was no evidence of a sludge collar. At the TTS, there was a narrow ridge of raised deposits that extended around the circumference.

There were several fresh shallow scrapes, attributable to the pulling operation, which ran along most of the length of the segment, starting below the TTS and extending above the TTS. A single tube installation scratch was observed at the 3150 orientation.

Below the TTS, the entire surface was covered with fresh shallow scrapes; typical for a pulled tube and attributable to the tube pulling operation.

2.2.6 Tube R24C41 -Segment 2 (FDB)Segment 2 was covered with a thin uniform layer of adherent black deposit. There were several shallow fresh scrapes that ran most of the length of the segment, attributable to the tube pulling operation.

Segment 2 contained the FDB region. The FDB region was not easily discernable

-owing to the relatively large diametrical clearance between the the tube and the FDB. This region differs little in appearance from freespan tubing. The FDB was located 16.7-inches above the bottom of Segment 2, and was identified by calculating its approximate location and then confirming its location by identifying features that would be associated with FDB contact. In the vicinity of the 16.7-inch elevation, a narrow, circumferential area of discolored tube surface was identified at the 135°- 1800 orientation, which was an unusual artifact in comparison to the rest of the tube. Presumably, this is the point where the tube rested against the bottom of the FDB. The presence of the mark was taken as confirmation of the calculated location of the FDB.Figure 2-7 shows four views of the FDB region around the circumference of the tube.The 1800 orientation view shows the FDB-contact mark near the bottom of the photo.The yellow coloration is the light reflecting off of the shiny tube surface features.A stereomicroscope examination of the area did not identify any evidence of corrosion on the FDB region of R24C41.2.2.7 Tube R24C41 -Segment 3 (02H TSP)Segment 3 contained the 02H TSP region. The TSP region was easily identified by unaided visual means as a region of non-uniform deposit. The TSP was centered 15.8-inches above the bottom of Segment 3. Segment 3 was mostly covered with a thin uniform adherent layer of black deposit, except in the region of the TSP and several inches of area just below the TSP region that may have been scraped off during the tube pulling operation.

One light tube installation scratch was observed at the 2700 orientation.

Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-5 Figure 2-8 shows four views of the 02H TSP region around the circumference of the tube.A stereomicroscope examination of the area did not identify any evidence of corrosion on the 02H TSP region of R24C41, although some of the surface was obscured by deposits.The top and bottom of the TSP region had patches of raised deposits around most of the circumference.

The rest of the TSP region also had small patches of deposits, but large portions of the TSP region were free of deposits.2.2.8 Tube R24C41 -Segment 4 (All Freespan)Segment 4 was entirely freespan tubing. There was a thin coat of adherent black deposits up to about 21-inches from the bottom of the segment; above this, the tube surface was black, but had a shiny appearance.

There were a few light, fresh tube pull scratches.

There were no other remarkable features on the surface of the segment. Figure 2-5 shows a representative view of Segment 4.2.2.9 Tube R24C41 -Segment 5 (03H TSP)Segment 5 contained the 03H TSP region. The TSP region was easily identified by unaided visual means as a region of non-uniform deposit. The TSP was centered 4.8-inches above the bottom of Segment 5. Segment 5 was mostly covered with a uniform adherent layer of black deposit, except in the region of the TSP and a small region just above the TSP. Several light tube pull scratches were observed.Figure 2-10 shows four views of the 03H TSP region around the circumference of the tube.A stereomicroscope examination of the area did not identify any evidence of corrosion on the 03H TSP region of R24C41, although nearly the entire surface was obscured by deposits.

The top and bottom of the TSP region had patches of raised deposits around most of the circumference.

2.2.10 Tube R24C41 -Segment 6 (04H TSP)Segment 6 contained the 04H TSP region. The TSP region was easily identified by unaided visual means as a region of non-uniform deposit. The TSP was centered 23.0-inches above the bottom of Segment 6. Segment 6 was mostly covered with a uniform adherent layer of black deposit, except in the region of the TSP. Several light tube pull scratches were observed.Figure 2-11 shows four views of the 04H TSP region around the circumference of the tube.A stereomicroscope examination of the area did not identify any evidence of corrosion on the 04H TSP region of R24C41, although much of the surface was obscured by deposits.The top and bottom of the TSP region had patches of raised deposits around most of the circumference.

In several areas of the bare tubing within the TSP region, the tube surface Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision I 2-6 has a brownish color. At the 90'- 1800 orientations, spots of brown were observed on top of the deposits.2.2.11 Tube R24C41 -Segment 7 (All Freespan)Segment 7 was entirely freespan tubing. There was a thin coat of adherent black deposits over the entire length. There were a few light, fresh tube pull scratches.

There were no other remarkable features on the surface of the segment. Figure 2-12 shows a representative view of Segment 7.2.3 Dimensional Characterization The as-received lengths of the segments provided to the laboratory are summarized in Table 1-2.After completion of the initial visual inspection and documentation of the as-received condition of the tube segments, a series of diameter measurements were made to characterize the dimensions in the regions of interest.Prior to dimensional characterization, the portions of tubing containing the TTS and TSP regions were cut into manageable lengths of 12-inches.

This was done for ALARA purposes, as well as in preparation for eddy current testing, leak screening and burst testing. The TTS and TSP regions were centered as best as possible within the 12-inch length of its section. Ends of the tube sections were squared-off and deburred.Following sectioning, dial caliper (Reference

12) measurements were made of the outer diameter of the TTS and TSP regions to obtain a profile of the diameter.

These measurements were made to characterize the presence of any ovalization or denting that may have been present.Measurements were made every 1/8-inch, starting an inch below the region and extending to an inch above the region. Measurements were made every 450 around the circumference at each elevation.

2.3.1 Diameter

Profile of R19C38 Regions Figure 2-13 presents a profile of the diameter in the TTS region of R19C38. The vertical axis (on the left) provides the diameter, the horizontal axis (on the bottom) provides the distance from the TTS (with the TTS in the middle of the axis at the 0.000-inch mark), and the remaining axis (on the right) provides the azimuthal orientation (using the orientation system portrayed in Figure 2-1). Diameters are color coded in 5 mil increments, as is shown in the legend, to help visualize the profile.Figure 2-13 shows that deposits and scrapes partially affected the tube diameter measurements.

The wide tube pull scrape at the 00 orientation (see Figure 2-2) was responsible for reduced diametrical measurements at the 00/180' orientation, both below and above the TTS. There may have been some mild ovalization of the tube in the vicinity of the TTS (likely from the tube pull operation) resulting in a maximum diameter at the 450/2250 orientation, both below and above the TTS. The bottom of the expansion transition is evident at the 0-inch elevation, and the expansion transition is shown to be 1/8-inch to 1/4-inch in length. There was no sign of denting at the R19C38 TTS.Receipt Inspection March 2015 SG-CCOE-1 4-4-NP Revision I 2-7 Figure 2-14 presents a profile of the diameter in the FDB region of R19C38. Deposits partially interfere with the tube diameter measurements.

The wide tube pull scrape at the 00 orientation (see Figure 2-3) was responsible for reduced diametrical measurements at the 00/1800 orientation along the entire measured length. A scratch with raised edges at about the 1450 orientation caused slightly elevated diameter measurements.

In general, the FDB region diametrical profile is indistinguishable from the freespan tubing above and below the region.Figure 2-15 presents a profile of the diameter in the 02H TSP region of R19C38. The TSP region is shown as a region with elevated deposits.

Denting was not evident from the diametrical measurements, but if present, may have been obscured by deposits.

The deposits in the '/2-inch region above the top of the TSP were, on average, about 3 mils thicker than the deposits immediately below the bottom of the TSP.2.3.2 Diameter Profile of R24C41 Regions Figure 2-16 presents a profile of the diameter in the TTS region of R24C41. As there were few deposits above the TTS, the surface is relatively unobscured.

The bottom of the expansion transition is evident at the 0-inch elevation, and the expansion transition is shown to be 1/8-inch to 1/4/4-inch in length. There was no sign of denting at the R24C41 TTS.Figure 2-17 presents a profile of the diameter in the FDB region of R24C41. Deposits partially interfere with the tube diameter measurements.

In general, the FDB region diametrical profile is indistinguishable from the freespan tubing above and below the region.Figure 2-18 presents a profile of the diameter in the 02H TSP region of R24C41. As Figure 2-8 shows, there were raised deposits at the top and bottom of the TSP region, but large parts of the TSP region were free of deposits.

The deposits in the V2-inch region above the top of the TSP were, on average, about 5 mils thicker than the deposits immediately below the bottom of the TSP. The diametrical measurements show a region of reduced diameter at the centerline of the TSP region at the 450/2250 orientation, although the entire centerline of the TSP had a diameter that was about 2-3 mils less than the baseline diameter (see the region above the TTS in Figure 2-16). Metallography identified three short axial cracks with a maximum depth of 14.2% throughwall at the 1600 orientation and two short axial cracks with a maximum depth of 10.7% throughwall at the 3400 orientation.

The 1600/3400 cracks are approximately orthogonal to the reduced diameter at 450/2250.

It is possible that tube diameter compression caused by corrosion products in the vicinity of the 450/2250 orientation would introduce tensile stresses to the outer surface of the tube 900 around the circumference, although there was no corresponding increase in diameter measured at the 1350/3150 orientation.

It is possible that the cracks identified in the 02H TSP region of R24C41 were caused by in-service denting.Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision I 2-8 Figure 2-19 presents a profile of the diameter in the 03H TSP region of R24C41. As Figure 2-10 shows, almost the entire region was covered with deposits, which were 5-9 mils thick. Since the tube-TSP drilled hole diametrical clearance is a nominal 16 mils, it seems that a significant fraction of the crevice deposits were retained on the 03H TSP region. Any sign of denting was covered by deposit.Figure 2-20 presents a profile of the diameter in the 04H TSP region of R24C41. As Figure 2-11 shows, most of the region was covered with deposits, except in the vicinity off the 450 orientation.

The deposits, where present, were 4-8 mils thick. Any sign of denting was covered by deposit.Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-9 top elevation for this s'-ment=>0" elevation for this segment=>notch 4 9g Looking at Bottom End A II 0 03 0 Figure 2-1: Orientation System Used in the Examination Receipt Inspection March 2015 SG-CCOE- I 4-4-NP Revision I Receipt Inspection SG-CCOE-144-NP March 2015 Revision I 2-10 1800 270U Figure 2-2: As-Received Views of R19C38 TTS Region Receipt Inspection SG-CCOE-14-4-NP March 2015 Revision I 2-11 1800 2700 Figure 2-3: As-Received Views of R19C38 FDB Region Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision 1 2-12 I I1 I-1800 270" Figure 2-4: As-Received Views of R19C38 02H TSP Region Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-13 Figure 2-5: As-Received Representative Views of R19C38 Freeespan Segment 4 Receipt Inspection SG-CCOE-14-4-NP March 2015 Revision I 2-14 18U, 2IU(Figure 2-6: As-Received Views of R24C41 TTS Region Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-15 1800 2700 Figure 2-7: As-Received Views of R24C41 FDB Region Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision I 2-16 Ix"ll Figure 2-8: As-Received Views of R24C41 02H TSP Region Receipt Inspection March 2015 SG-CCOE- 14-4-NP Revision 1 2-17 Figure 2-9: As-Received Representative Views ofR24C41 Freeespan Segment 4 Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-18 Figure 2-10: 270u As-Received Views of R24C41 03H TSP Region Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-19 900 1800 2700 Figure 2-11: As-Received Views ofR24C41 04H TSP Region Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-20 Figure 2-12: As-Received Representative View of R24C41 Freeespan Segment 7 Receipt Inspection March 2015 SG-CCOE-14-4-NP Revision I 2-21 a,c,e Figure 2-13: Diameter Profile of TTS Region of R19C38, Showing the Expansion Transition Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-22 U w ED 0.895 0.890 0.885 0.880 0.875 0.870 0.865 0 0.890-0.895 N 0.885-0.890 n 0.880-0.885 X 0.875-0.880 0 0.870-0.875 a 0.865-0.870 S 16 4.'C S 0*1-C 4.E Distance Above the Centerline of the Flow Distribution Baffle (inches)Figure 2-14: Diameter Profile of FDB Region of R19C38 Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-23 E I-Sl 5l 0.895 -0.890 0.885 0.880 0.875 0.870 0.865 aet" 0.890-0.895

• 0.885-0.890" 0.880-0.885" 0.875-0.880

• 0.870-0.875

• 0.865-0.870 0 E 0"/Distance Above the Centerline of the Tube Support Plate (inches)Figure 2-15: Diameter Profile of 02H TSP Region of R19C38 Receipt Inspection SG-CCOE-14-4-NP March 2015 Revision 1 2-24 a,c,e Figure 2-16: Diameter Profile of TTS Region of R24C41, Showing the Expansion Transition Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision 1 2-25_I a-0.895 0.890 0.885 0.880 0.875 0.870 0.865 ,n r4" 0.890-0.895

[ 0.885-0.890" 0.880-0885

[ 0.875-0.880" 0.870-0.875 1 0.865-0.870 0 E Ln en 8 %n 9 f4 0 r4 A Ln C5 Ln 4S-6 G! in Lon Q r-ý ;, 0 Ln 6 ý N 0'/180.1-4 ri LO r-1 Ný4 ri Distance Above the Centerline of the Flow Distrbution Baffle (inches)Figure 2-17: Diameter Profile of FDB Region of R24C41 Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision I 2-26 U C II OP E'U 0 0.895 0.890 0.885 -0.880 0.875 0.870 0.865 B 0.890-0.895 E 0.885-0.890 w 0.880-0.885

• 0.875-0.880 m 0.870-0.875 m 0.865-0.870 0o/180.C C 0'N a.C E Distance Above the Centerline of the Tube Support Plate (inches)Figure 2-18: Diameter Profile of 02H TSP Region of R24C41 Receipt Inspection SG-CCOE-14-4-NP March 2015 Revision I 2-27 U C 0.895 0.890 0.885 0.880 0.875 0.970 0.865 rr-4 00 .n a -T-1" 0.890-0.895" 0.885-0.890" 0.880-0.885" 0.875-0.880 9 0.870-0.875 0 0.865-0.870 C a*5 0 E 0W/Distance Above the Centerline of the Tube Support Plate (inches)Figure 2-19: Diameter Profile of 03H TSP Region of R24C41 Receipt Inspection SG-CCOE- 144-NP March 2015 Revision I 2-28:E.U C I-II 4.'0.895 0.890 0.885 0.880 0.875 0.870 0.865 W 0.890-0.895

• 0.885-0.890" 0.880-0.885

• 0,875-0.880 0 0.870-0.875 N 0.865 0.870 180.C 0'N.C S E 0"/Distance Above the Centerline of the Tube Support Plate (inches)Figure 2-20: Diameter Profile of 04H TSP Region of R24C41 Receipt Inspection SG-CCOE- 14-4-NP March 2015 Revision 1 3-1 3.0 EDDY CURRENT TEST INSPECTION

3.1 Introduction

Six sections, each approximately 12-inches long, were shipped to the Westinghouse Waltz Mill Site from WCS to have eddy current testing (ECT) performed.

As was noted in Section 2.3, the TTS and TSP regions were centered as best as possible within the 12-inch length of its section.Table 3-1 lists the sections.

Two sections were from R19C38 that included the TTS and 02H TSP locations.

Four sections were from R24C41 that included the TTS, and the 02H, 03H and 04H TSP locations.

There were three different test types performed on all six sections:

bobbin,+Point and Ghent. The analysis was performed at the Waltz Mill Remote Data Eddy Current Data Analysis Center (REDAC). Non-destructive examination (NDE) certifications for personnel involved with the eddy current acquisition and analysis are included in Appendix A of Reference 7.3.2 General Laboratory Acquisition and Analysis For all tests performed, the appropriate standard was tested at the beginning and end of each data set (REEL). A message was recorded prior to the testing of each section and test type indicating the identification of the section and the orientation that the sections were tested. The data for each test was monitored (in real time) by the Level III qualified data analyst (QDA) to ensure data quality. The analysis and setups for all three techniques (Bobbin, +Point probe and Ghent)were performed in the REDAC and in accordance to applicable requirements documented in References 13 through 17. A piece of aluminum backed tape was used to create an "L" shape which is distinguishable to rotating type probes. The "L" shape was located on each section as documented in Table 3-1. The circumferential arc lengths (in degrees) of detected artifacts with respect to the "L" on the section were determined and documented for applicable techniques

(+Point probe and Ghent probes). The axial/vertical part of the "L" on the tube section represents the laboratory point zero degree reference azimuthal orientation.

The circumferential/horizontal part of the "L" points toward 90 degrees. Table 3-2 summarizes the results of all evaluations performed at Waltz Mill.3.3 Laboratory Bobbin Probe Data Acquisition and Analysis Refer to Reference 13 for applicable acquisition and analysis setup parameters that were used for this technique.

This Examination Technique Specification Sheet (ETSS) (DMW-02-14) has a test speed of 24 inches/sec.

at a sampling rate of 1632 samples/sec.

This equates to over twice the required amount of sampling points per inch of tube (-68 samples/inch) (Reference 13). The tester configuration file used was DMW-BOBBIN-12.CFG (Reference 17). As stated in the ETSS, the American Society of Mechanical Engineers (ASME) standard (S/N: ADVB-047-97) was used for this technique.

A 0.720 LLMC type bobbin probe was used for this technique and has the serial number (S/N): 646589. Per Reference 13, the voltage settings for the 400 kHz and P1 differential channels were 3.78 and 2.45 volts, respectively, on the 4X20% flat bottom holes (FBHs).Figure 3-1 through Figure 3-6 illustrate the laboratory bobbin responses for the six sections.Results for the evaluations of this technique are tabulated in Table 3-2. Section R19C38-3B Eddy Current Test Inspection March 2015 SG-CCOE- 14-4-NP Revision I 3-2 (02H) has a bobbin voltage response larger than what was reported prior to pulling the tube; a factor of 3 to 4 times increase in the pre-pull bobbin voltage is not unexpected for an axial indication in a pulled tube. The three TSP locations 02H, 03H and 04H (for sections 3B, 5B and 6B, respectively) of R24C41 have a dent response at the area of interest with P 1 channel voltages of 13.87, 10.81 and 10.92, respectively.

No detectable degradation (NDD) can be observed at these three locations of interest due to the large over-riding dent responses.

These dent-like responses are judged as being a result of the tube pull process. Section 2.3 discussed anomalies in the diameter profile for the 02H TSP of R24C41 (shown in Figure 2-18) that appeared to be denting. The two TSH locations where judged to be NDD.3.4 Three Coil +Point Probe Data Acquisition and Analysis Refer to Reference 14 for applicable acquisition and analysis setup parameters that were used for this technique.

Per this ETSS (DMW-05-14), the tester configuration file used was DMW-3COIL+PT-12.CFG (Reference 17). The electrode discharge machining (EDM) standard that was used for this technique was S/N: EP5-054-98.

The motor unit and probe head used for this technique have S/Ns: 467571 and 455341, respectively.

Figure 3-7 through Figure 3-14 illustrate the laboratory three (3) coil 300 kHz +Point probe responses for the six sections.

Results for the evaluations of this technique are tabulated in Table 3-2. The laboratory

+Point probe responses are relatively consistent with the data collected prior to the tube pulls. The voltages are consistent as to what was reported in the field.Section R19C38-3B (02H) was evaluated as having SAIs located at the top and bottom locations of the support plate. Section R24C41-6B (04H) was reported in the field ECT as having two single axial indications (SAI) in the same axial location (Table 3-2), which is actually the definition of a multiple axial indication (MAI). Each ligament of the MAI was evaluated with similar amplitudes to what was reported in the field (see Figure 3-13 and Figure 3-14). The dent-like response observed during the laboratory bobbin testing of R24C41 did not affect detectability for this +Point technique in the laboratory.

The results of the remaining four sections were consistent with what was reported in the field prior to pulling the tubes (NDD).Figure 3-7 and Figure 3-10 also show three long parallel axial artifacts below the top of the tubesheet.

These are TIG welds used in the tube pull operation to relax the tube-tubesheet joint.3.5 Ghent Acquisition and Analysis Refer to Reference 15 for applicable acquisition and analysis setup parameters that were used for this technique.

Per this ETSS (DMW-12-14), the tester configuration file used was DMW-RG3-4-12.CFG (Reference 17). The EDM standard that was used for this technique was S/N: EP5-054-98. The motor unit and probe head used for this technique have S/Ns: 467571 and 583268, respectively.

Figure 3-15 through Figure 3-23 illustrate the laboratory 300 kHz axial-sensitive Ghent responses for the six sections.

Results for the evaluations of this technique are tabulated in Table 3-2. These voltages are representative to the +Point probe voltages in the laboratory and as to what was reported in the field.Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-3 Section R19C38-3B (02H) was evaluated as having SAIs located at the top and bottom locations of the support plate. The Ghent response for section R24C41-613 (04H) revealed three ligaments for the MAI, with the additional ligament (3) being small in voltage (0.10 volts). The dent-like responses observed during the laboratory bobbin testing of R24C41 did not affect detectability for this Ghent probe technique in the laboratory.

The results of the remaining four sections were consistent with what was reported in the field prior to pulling the tubes (NDD).Figure 3-15 and Figure 3-18 also show three long parallel axial artifacts below the top of the tubesheet.

These are TIG welds used in the tube pull operation to relax the tube-tubesheet joint.3.6 Review of Field Data Prior to the Tube Pull Process A re-evaluation of the field data collected prior to the tube pulling process was performed.

Results of the re-evaluation are consistent to the results reported in the field, except with the interpretation or classification of R24C41 at 04H. The field evaluation reported two separate SAIs for this intersection with both located at the same axial location of the tube. This condition is interpreted as MAIs in the re-evaluation in the laboratory.

Results of this field data review are tabulated in Table 3-2. Figure 3-24 through Figure 3-29 illustrate the re-evaluation responses for the bobbin technique and Figure 3-30 through Figure 3-36 for the +Point probe technique.

3.7 ECT Conclusions A comparison of pre-pull and post-pull rotating probe voltages shows little change from the tube-pull process. In the case of R19C38-3B (02H), the bobbin voltage increased by a factor of 3.5 most likely from the pulling operation, which is typical of Westinghouse experience for pulled tubes with small voltage axial indications and does not indicate a significant alteration in the pre-pull condition from the pulling operation.

The pulling operation likely had little effect on the crack-like indications.

The post-pull bobbin examination performed in the laboratory revealed significant dent-like indications at all three TSP locations of R24C41 that were not reportable prior to the tube pull. These dent-like responses of tube R24C41 masked laboratory bobbin detectability of the DSIs that were reported in the field data prior to the tube pull.The field indication identified by bobbin coil at R24C41-3B (02H), which was not confirmed by field +Point probe, was also found to be NDD by both laboratory rotating probes as well.The laboratory eddy current testing did not identify any false-positive field indications.

Eddy Current Test Inspection SG-CCOE- 14-4-NP March 2015 Revision I 3-4 Table 3-1: ECT Samples Region of Location of Center of Location of Tube Section Interest Area of Interest "L" Indicator R19C38 IB TTS (TSH) Bottom lB to TSH = 8.4" Above TSH R19C38 3B 02H Bottom 3B to 02H = 6.0" Above 02H R24C41 I B TTS (TSH) Bottom I B to TSH = 9.7" Below TSH R24C41 3B 02H Bottom 3B to 02H = 6.0" Above 02H R24C41 5B 03H Bottom 5B to 03H = 4.5" Above 03H R24C41 6B 04H Bottom 6B to 04H = 6.0" Above 04H TSH -Same as TTS. Top of Hot Leg Tubesheet Eddy Current Test Inspection SG-CCOE- 14-4-NP March 2015 Revision I 3-5 Table 3-2: Summary of Field and Laboratory Eddy Current Inspection Results Tube Pre-Pull Field Eddy Current Pre-Pull Field Data Review Laboratory Eddy Current Section -Bobbin Coil +Point IND / Bobbin Coil +Point IND / Bobbin Coil +Point Ghent Region IND / Volts* Volts* IND/Volts*

Volts* 1ND / Volts* IND / Volts* / Azimuth IND / Volts* / Azimuth RI9C38 R19C38 NDD NDD NDD NDD NDD NDD NDD 1B -TSH R19C38 SAI (Top&Bot)

SA1 (Top&Bot)

SAI (Top&Bot)

SAI(Top&Bot)

DSI / 0.62v SAI(Top) / 0.25v DSI / 2.01v SAI(Top) / 0.1 7v DSI / 2.15v SAI(Top) / 0.15v / 3370 SAI(Top) / 0.28v / 3370 SAI(Bot) / 0.1 5v SAI(Bot) / 0.1 Iv SAI(Bot) / 0. 17v / 50 SAI(Bot) / 0.34v / 8'R24C41 NDD NDD NDD NDD NDD NDD NDD I B -TSH R24C41 3B-02H DSI/1.19v NDF DSI/1.25v NDF DNT/13.87v NDD NDD 3B -02H R24C41 RB-03H NDD NI NDD NI DNT / 10.81v NDD NDD 5B -03H SAI (2 Reported)

MAI (2 Ligaments)

MAI (2 Ligaments)

MAI (3 Ligaments) 6B- 41 DSI / 0.47v SAI(l) / 0.23v DSI / 0.56v MAI(Ligl)

/ 0.1 6v DNT / 10.92v MAI(Ligl)

/ 0.21 v /3330 MAI(LigI)

/ 0.57v /3360 SAI(2) / 0.09v MAI(Lig2)

/ 0.11 v MAI(Lig2)

/ 0.09v / 92' MAI(Lig3)

/ 0.15v / 290*Bobbin voltages are from the P1 channel; +Point and Ghent are from the 300 kHz axial channel NDF -No Degradation Found DNT -Dented Location MAI -Multiple Axial Indication NDD -No Detectable Degradation NI -Not Inspected Lig -Ligament of MAI SAI- Signal Axial Indication NA -Not applicable TSH -Top of the Hot Leg Tubesheet (Same as TTS)DSI -Distorted Support Indication Azimuth -Circumferential degrees from the axial part of the "L" starting in the direction of the horizontal part of the "L" Eddy Current Test Inspection SG-CCOE- 14-4-NP March 2015 Revision I 3-6 Figure 3-1: Laboratory Bobbin -R19C38-1B TSH -NDD Figure 3-2: Laboratory Bobbin -R19C38-3B (02H) -DSI Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-7 Figure 3-3: Laboratory Bobbin -R24C41-1B (TSH) -NDD Figure 3-4: Laboratory Bobbin -R24C41-3B (02H) -DNT Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-8 Figure 3-5: Laboratory Bobbin -R24C41-5B (03H) -DNT Figure 3-6: Laboratory Bobbin -R24C41-6B (04H) -DNT Eddy Current Test Inspection SG-CCOE-14-4-NP March 2015 Revision I 3-9 Figure 3-7: Laboratory

+Point Probe -R19C38-1B TSH -NDD Figure 3-8: Laboratory

+Point Probe -R19C38-3B (02H) -Bottom -SAI Eddy Current Test Inspection March 2015 SG-CCOE- 1 4-4-NP Revision I 3-10 Figure 3-9: Laboratory

+Point Probe -R19C38-3B (02H) -Top -SAI Figure 3-10: Laboratory

+Point Probe- R24C41-lB TSH -NDD Eddy Current Test Inspection SG-CCOE-14-4-NP March 2015 Revision I 3-11 Figure 3-11: Laboratory

+Point Probe -R24C41-3B (02H) -NDD Figure 3-12: Laboratory

+Point Probe -R24C41-5B (03H) -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-12 Figure 3-13: Laboratory

+Point Probe -R24C41-6B (04H) -Ligament # 1 -MAI Figure 3-14: Laboratory

+Point Probe -R24C41-6B (04H) -Ligament # 2 -MAI Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-13 Figure 3-15: Laboratory Ghent Probe -R19C38-1B TSH -NDD Figure 3-16: Laboratory Ghent Probe -R19C38-3B (02H) -Bottom -SAI Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision 1 3-14 Figure 3-17: Laboratory Ghent Probe -R19C38-3B (02H) -Top -SAI Figure 3-18: Laboratory Ghent Probe -R24C41-lB TSH -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-15 Figure 3-19: Laboratory Ghent Probe -R24C41-3B (02H) -NDD Figure 3-20: Laboratory Ghent Probe -R24C41-5B (03H) -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-16 Figure 3-21: Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # 1 -MAI Figure 3-22: Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # 2 -MAI Eddy Current Test Inspection SG-CCOE- 14-4-NP March 2015 Revision I 3-17 Figure 3-23: Laboratory Ghent Probe -R24C41-6B (04H) -Ligament # 3 -MAI Figure 3-24: In-Generator Bobbin Probe -R19C38-1B TSH -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision 1 3-18 Figure 3-25: In-Generator Bobbin Probe -R19C38-3B (02H) -DSI Figure 3-26: In-Generator Bobbin Probe -R24C41-1B TSH -NDD Eddy Current Test Inspection March 2015 SG-CCOE- 14-4-NP Revision I 3-19 Figure 3-27: In-Generator Bobbin Probe -R24C41-3B (02H) -DSI Figure 3-28: In-Generator Bobbin Probe -R24C41-5B (03H) -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision 1 3-20 Figure 3-29: In-Generator Bobbin Probe -R24C41-6B (04H) -DSI Figure 3-30: In-Generator

+Point Probe -R19C38-1B TSH -NDD Eddy Current Test Inspection SG-CCOE- 14-4-NP March 2015 Revision I 3-21 Figure 3-31: In-Generator

+Point Probe -R19C38-3B (02H) -Bottom -SAI Figure 3-32: In-Generator

+Point Probe -R19C38-3B (02H) -Top -SAI Eddy Current Test Inspection SG-CCOE-14-4-NP March 2015 Revision I 3-22 Figure 3-33: In-Generator

+Point Probe R24C41-1B TSH NDD Figure 3-34: In-Generator

+Point Probe -R24C41-3B (02H) -NDD Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I 3-23 Figure 3-35: In-Generator

+Point Probe -R24C41-6B (04H) -Ligament # 1 -MAI Figure 3-36: In-Generator

+Point Probe -R24C41-6B (04H) -Ligament # 2 -MAI Eddy Current Test Inspection March 2015 SG-CCOE-14-4-NP Revision I