ML13051A197

Enclosure 6, LTR-SGDA-12-36, Rev. 3, Flow-Induced Vibration and Tube Wear Analysis of the San Onofre Nuclear Generating Station Unit 2 Replacement Steam Generators Supporting Restart. Cover Through Page 227 of 415

ML13051A197
Person / Time
Site:	San Onofre
Issue date:	02/15/2013
From:	Bell B, Cullen W, Hall J, Langford P, Norman T, Pournaras T, Prabhu P, Thakkar J Westinghouse
To:	Office of Nuclear Reactor Regulation
References
TAC ME9727 1814-AA086-M0238, Rev 0, LTR-SGDA-12-36, Rev 3
Download: ML13051A197 (228)

Text

ENCLOSURE 6 WEC Non-Proprietary Document LTR-SGDA-12-36, Flow-Induced Vibration and Tube Wear Analysis of the San Onofre Nuclear Generating Station Unit 2 Replacement Steam Generators Supporting Restart (Non-Proprietary)

Westinghouse Non-Proprietary Class 3 Page 1 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 LTR-SGDA-12-36, Revision 3 Flow-Induced Vibration and Tube Wear Analysis of the San Onofre Nuclear Generating Station Unit 2 Replacement Steam Generators Supporting Restart February 15, 2013 Supplie Statu sStamp

~.181 4-AA086-M0238 I ýI'N/A J. M. Hall NCE DCUKY-OML4TONL ouv fltP KWU MANUAL B. A. Bell MPS MAY PROCUWD l3Y AW OO W. K. Cullen STATUS - Ad" rie *dIWV doaainmf OWd Iku It cpmI muIm

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J. G. Thakkar P. J. Langford 0mw SCE DE(23) SREV. 3 07/11 REFERENCES0123-XXIV-7.8.26 Reviewed by:

D. P. Siska SG Management Programs Approved by:

N. D. Vitale, Manager SG Design and Analysis Westinghouse Electric Company LLC 1000 Westinghouse Drive Cranberry Township, PA 16066, USA

© 2013 Westinghouse Electric Company LLC All Rights Reserved 1814-AA086-M0238, REV. 0 Page 2 of 415

Page 2 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table of Contents 1.0 Introduction ........................................................................................................................... 7 1.1 Steam Generator Design Configuration ..................................................................... 7 1.2 Degradation Modes Addressed ................................................................................... 8 1.3 Sum m ary of O peration and Inspection Plan ............................................................... 8 1.4 Description of Methodology ........................................................................................ 8 2.0 Sum m ary/Conclusions ................................................................................................... 12 2.1 FIV Results Sum m ary ............................................................................................... 12 2.1.1 O ut-of-Plane ........................................................................................................ 13 2.1.2 In-Plane ................................................................................................................... 13 2.2 W ear Analysis Sum m ary .......................................................................................... 13 2.2.1 Tube W ear Sum m ary .......................................................................................... 13 2.2.2 AVB W ear Potential ............................................................................................. 14 2.3 Potential for In-Plane Tube-to-Tube Contact and In-Plane Instability ....................... 14 2.4 Modification of Plugging Criteria Considering Unit 3 Data ........................................ 15 2.5 Sum m ary and Recom m endations ............................................................................ 16 3.0 ATHO S Analysis ................................................................................................................. 18 3.1 Analysis Methods ...................................................................................................... 18 3.1.1 Description of Com puter Codes .......................................................................... 18 3.1.2 Discussion of Significant Assum ptions ................................................................. 20 3.1.3 Acceptance Criteria ............................................................................................ 21 3.1.4 Input ........................................................................................................................ 21 3.2 Power Levels ................................................................................................................. 31 3.3 Results Sum m ary ...................................................................................................... 31 3.4 Unit 3 O perating Conditions ..................................................................................... 46 3.5 References .................................................................................................................... 61 4.0 Flow-Induced Vibration Analysis ...................................................................................... 63 4.1 FIV Introduction ........................................................................................................ 63 4.2 Method .......................................................................................................................... 81 4.2.1 Fluidelastic Excitation .......................................................................................... 83 4.2.2 Flow Turbulence ................................................................................................. 86 4.2.3 Dam ping in the Straight Leg Region .................................................................. 87 4.2.4 Dam ping in the U-bend Region .......................................................................... 87 1814-AA086-M0238, REV. 0 Page 3 of 415

Page 3 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table of Contents (cont.)

4.2.5 Flow-Induced Vibration Relevant Input Parameters ............................................ 88 4.2.6 Flow-Induced Vibration Model ............................................................................ 97 4.3 Typical Results ............................................................................................................ 101 4.3.1 Out-of-Plane Results ............................................................................................. 101 4.3.2 In-Plane Results .................................................................................................... 101 4.3.3 Typical Mode Shapes ............................................................................................ 138 4.4 Additional Considerations ........................................................................................... 155 4.4.1 SG 2E088 versus SG 2E089 and Low versus High Column ................................. 155 4.4.2 Effects of Different Mass on Tube Response ........................................................ 166 4.4.3 Stabilization Using Two Cables ............................................................................. 167 4.5 FIV versus Power Level Discussion ............................................................................ 177 4.6 Unit 3 100% Power FIV Evaluation ............................................................................. 179 4.7 References .................................................................................................................. 183 5.0 SONGS Unit 2 Eddy Current Summary and Review ........................................................ 185 5.1 AVB/TSP Wear ............................................................................................................ 185 5.1.1 SG 2E088 .............................................................................................................. 186 5.1.2 SG 2E089 .............................................................................................................. 186 5.1.3 In-Plane W ear Indications (Wear Outside of AVB) ................................................ 186 5.1.4 AVB Insertion Depths for Column 81 and Tube Denting at AVB Observations .... 187 5.1.5 Estimate of the Number of Ineffective Supports .................................................... 188 5.2 Tube-to-Tube Wear and Proximity Review ................................................................. 188 5.2.1 Initial Tube-to-Tube Proxim ity Review ................................................................... 188 5.2.2 Supplemental Proxim ity Review ............................................................................ 189 5.2.3 Review of Field Reported Wear on R113 C81 and R111 C81 in Unit 2 SG 2E089190 5.3 Tube Plugging Summary .................................................................................................. 193 5.4 Sum mary of Unit 3 Eddy Current Review ......................................................................... 193 5.4.1 Observations Related to AVB Symmetry Variance and Wear Scar Geometry ...... 194 5.4.2 Observations Related to Tube Motions ................................................................. 194 5.4.3 Observations of W ear at the Top TSP .................................................................. 194 5.5 References .................................................................................................................. 197 1814-AA086-M0238, REV. 0 Page 4 of 415

Page 4 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table of Contents (cont.)

6.0 Critical Tubes .................................................................................................................... 227 6.1 Method ........................................................................................................................ 227 6.2 Tube Groups ............................................................................................................... 228 6.3 Enveloping Tubes ....................................................................................................... 244 7.0 Wear Analysis ................................................................................................................... 248 7.1 General Methodology .................................................................................................. 248 7.2 Wear Considerations - Fluidelastic Tube Excitation versus Turbulence .................... 248 7.2.1 W estinghouse Test Program s ............................................................................... 250 7.2.2 W estinghouse Design Basis .................................................................................. 253 7.2.3 Operational History of "Plant B". ........................................................................... 257 7.2.4 Application to SO NGS Steam Generators ............................................................ 258 7.3 Tube W ear Projection Results ..................................................................................... 261 7.3.1 Active Tubes .......................................................................................................... 262 7.3.2 Plugged Tubes ...................................................................................................... 263 7.3.3 R 11-113/C81 Tube/AVB Wear Results ............................................................... 264 7.3.4 Potential for Increased Probability of IP Modes after W ear ................................... 265 7.4 Potential for W ear on AVB Surfaces ........................................................................... 266 7.4.1 Tube FIV Induced W ear ........................................................................................ 266 7.4.2 AVB FIV Induced W ear Potential .......................................................................... 266 7.5 Potential for Additional Tube-to-Tube Wear at R1 11/1 13C81 ................ 267 7.6 Sum mary ..................................................................................................................... 270 7.7 References .................................................................................................................. 271 8.0 Additional Considerations ................................................................................................. 304 8.1 Evidence for Lack of In-Plane Instability in Unit 2 ....................................................... 304 8.1.1 FIV Results ............................................................................................................ 304 8.1.2 ECT Results .......................................................................................................... 305 8.2 Upper Bundle Tube Proxim ity ..................................................................................... 305 8.2.1 Potential Manufacturing Issues ............................................................................. 305 8.2.2 Sum mary Eddy Current Data - PSI / ISI ................................................................ 308 8.2.3 Additional Considerations from Unit 3 ................................................................... 309 8.2.4 Conclusions ........................................................................................................... 309 1814-AA086-M0238, REV. 0 Page 5 of 415

Page 5 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table of Contents (cont.)

8.3 Low Stability Ratio Tubes with Higher W ear ............................................................... 309 8.4 W ear Projection Uncertainty ........................................................................................ 310 9.0 Consideration of Unit 3 Tube Wear on Wear Model Applied in Unit 2 .............................. 320 9.1 Unit 3 Critical Tube Selection for Model Validation ..................................................... 320 9.2 Unit 3 Analysis ............................................................................................................. 320 9.3 Plugging Criteria Development .................................................................................... 322 9.3.1 Criterion 1 - Free Span Contact ................................................................................ 322 9.3.2 Criterion 2 - W ear Outside AVB sites ........................................................................ 322 9.3.3 Criterion 3 - Ineffective AVB Sites and In-Plane Motion ........................................... 322 9.3.4 Criterion 4 - Wear at Top TSP Sites ......................................................................... 323 9.3.5 Criterion 5 - AVB Sites and Wear Potential due to Out-of-Plane Motion .................. 324 9.4 Application of the Criteria to the Unit 3 Tube Sample ................................................. 325 9.5 Application to Unit 2 .................................................................................................... 325 10.0 Recommendations Regarding Operation at Reduced Power Levels ................................ 341 10.1 Additional Unit 2 Tube Plugging Due to Criterion 4 ..................................................... 341 10.2 Tube W ear Criterion 5 ................................................................................................. 341 10.3 Recommendations ...................................................................................................... 342 10.4 References .................................................................................................................. 34 3 Appendix A: Nomenclature ....................................................................................................... 344 Appendix B Additional Proximity Analysis for Ri 11/1 13C81 .................................................... 349 B-1 Introduction ................................................................................................................. 349 B-2 Eddy Current Review .................................................................................................. 349 B-2.1 Industry Freespan Wear Experience Without In-Plane Instability ......................... 349 B-2.2 Causative Mechanism for Explanation of the Presence of Freespan Wear Without Wear Extension from AVBs .......................................................................................................... 350 B-2.3 Detection Condition Associated with Wear Extension from AVBs ........................ 352 B-3 Temperature Pressure and FIV Effects ....................................................................... 353 B-3.1 Tube Thermal Expansion ...................................................................................... 353 B-3.2 Tube Movement at AVB 5 ..................................................................................... 354 B-3.3 In-Plane Turbulent Displacement .......................................................................... 354 B-4 Summary ..................................................................................................................... 355 B-5 References .................................................................................................................. 356 1814-AA086-M0238, REV. 0 Page 6 of 415

Page 6 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table of Contents (cont.)

Appendix C Effect of Installation of Split Cable Stabilizers in the Tube FIV Response ............ 372 C-1 Introduction ................................................................................................................. 372 C-2 Method ........................................................................................................................ 372 C-2.1 FASTVIB ............................................................................................................... 372 C-2.2 Stabilizer Properties .............................................................................................. 373 C-3 Results ........................................................................................................................ 375 C-4 Conclusions ................................................................................................................. 414 C-5 References .................................................................................................................. 414 1814-AA086-M0238, REV. 0 Page 7 of 415

Page 7 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 1.0 Introduction San Onofre Nuclear Generating Station (SONGS) Unit 2 is a two-loop pressurized water reactor that started commercial operation in 1983. The original steam generators (SGs), which were designed and built by Combustion Engineering (CE), were replaced in 2010 after 16 fuel cycles. The replacement steam generators (RSGs) were designed and fabricated by Mitsubishi Heavy Industries (MHI).

The first in-service inspection (ISI) of the Unit 2 RSGs was performed in 2012. This inspection identified a large number of tube wear indications at various support locations both in the straight leg sections and in the U-bend. Several tubes were plugged during the outage and cable stabilizers were installed in many of the plugged tubes prior to plugging. This report describes the evaluation performed by Westinghouse to assess the tubes with wear indications in the U-bend for continued operation in the next fuel cycle.

This evaluation uses a semi-empirical method that has been used for the flow-induced vibration (FIV) analysis and design of the SGs. The analytical methodology was developed by Westinghouse based on a very robust test program several decades ago and has been published in the open literature (see References 7-1, and 7-6 through 7-10 in Section 7). The basic formulations have been well understood and accepted by experts in the industry. The methodology in conjunction with relevant manufacturing controls has been applied successfully with outstanding results in SGs designed by Westinghouse over the past three decades.

1.1 Steam Generator Design Configuration Each RSG has 9727 U-tubes made of thermally treated Alloy 690 (SB-163, UNS N06690) with an outside diameter of 0.75 inch and an average wall thickness of 0.043 inch (all dimensions are nominal unless otherwise noted). The tubes are arranged in a triangular pitch of 1.00 inch such that the distance between adjacent tube rows is 0.50 inch and the distance between adjacent columns is 0.866 inch. There are 142 rows and 177 columns. The ends of each tube are hydraulically expanded in the tubesheet which is 27.95 inches thick. The tubes are supported by seven tri-foiled broached tube support plates (TSPs) in the straight legs and up to twelve anti-vibration bar (AVB) contact locations in the U-bend. The AVBs are intended to provide tube support in the U-bend thereby preventing tube damage due to vibration. They have a width of 0.59 inch and a thickness of 0.114 inch and are made from SA-479, Type 405 stainless steel. The TSPs are made from SA-240, Type 405 stainless steel and have a thickness of 1.38 inches. There are a total of 48 stay rods in the tube bundle arranged in two approximate circles around the center line of the SG. The stay rods are distributed equally between the hot leg and the cold leg sides, with each pair replacing a tube from the bundle and occupying 24 tube locations.

The tube bundle wrapper has an inside diameter (ID) of 159.96 inches and a thickness of 0.47 inch.

The lower shell has an ID of 166.54 inches and a thickness of 4.06 inches and extends approximately 288.7 inches above the top of the tubesheet. The shell transition cone has a height of approximately 77.5 inches and is located at the approximate elevation of the U-bend region. The upper shell has an ID of 253.81 inches and a nominal thickness of 5.16 inches. The total height of the SG is approximately 785.6 inches.

The steam drum within the upper shell contains 38 primary separator risers arranged in three concentric circles and a single-tier secondary separator consisting of eight parallel banks of demister 1814-AA086-M0238, REV. 0 Page 8 of 415

Page 8 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 vanes. The feedwater (FW) distribution ring surrounds the outermost ring of primary separator risers and is located close to the top of the transition cone. The FW distribution ring is connected to the FW nozzle located in the upper shell near its bottom. The steam nozzle is located in the center of the elliptical head at the top of the SG.

1.2 Degradation Modes Addressed The focus of the evaluation described in this report was the tube wear indications in the U-bend region of the SG. These indications included tube wear at AVB locations and tube-to-tube wear in the U-bend free span between the AVBs. In addition, the potential for in-plane vibration that can lead to tube-to-tube wear as observed in the Unit 3 SGs was addressed. Thus the degradation modes leading to the flaw indications included tube wear resulting from the interaction of the tubes with the AVBs and from the interaction of the tubes with one another. These are the only degradation mechanisms covered by this analysis. Indications reported at the retainer bars or in other (than U-bend) regions of the SG are not addressed in this report.

1.3 Summary of Operation and Inspection Plan The SG inspection at the end of Cycle 16 (2C16) was conducted in 2012. This was the first in-service inspection of the RSGs. The Unit 2 RSGs had accumulated an operating duration of 20.6 effective full power months (EFPM) during Cycle 16 operation.

Southern California Edison (SCE) is planning to perform a mid-cycle inspection of the SGs after operating less than 6 months in the next fuel cycle (Cycle 17). Hence a conservative value of 6 EFPM was used as the operating length until the next inspection. However, additional analysis was also performed tht demonstrated acceptable operation for at least 18 months.

1.4 Description of Methodology The methodology used to evaluate the steam generators at SONGS Unit 2 involves many steps. These steps are outlined in Figure 1-1. The following discussions will describe the methodology used to show that the SONGS Unit 2 steam generators will be acceptable for continued operation at a reduced power level.

The first step in the evaluation is to identify the 100% power operating conditions that the SONGS Unit 2 steam generators were operated at during Cycle 16. These operating conditions are then input into an ATHOS thermal-hydraulic evaluation of the steam generators. This analysis is described and summarized in Section 3.0.

The second step in the evaluation is to perform the flow-induced vibration (FIV) evaluation of the SONGS Unit 2 steam generators using the ATHOS thermal-hydraulic (TH) data for the 100% power level condition. This evaluation is performed using the FASTVIB computer code which evaluates up to 25 tube rows in a single evaluation. The FIV evaluation of the SONGS Unit 2 tube bundles is evaluated for a total of 79 different AVB support conditions in the U-bend region of the tube bundle. These support cases assume that the gap between the AVB and the tube is sufficiently large such that the AVB is assumed to be ineffective. The details of the FIV evaluation as well as a summary of results are described in Section 4.0 of this report.

1814-AA086-M0238, REV. 0 Page 9 of 415

Page 9 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 In conjunction with the thermal-hydraulic analysis and the FIV analysis, a review of the bobbin coil and the RPC eddy current data was performed. The review of this data is performed to determine AVB support locations that have indications of tube wear at the AVB location. The RPC data is specifically interrogated to determine if any tubes have low level wear that would not be detectable in the bobbin coil data. Wear at the AVB sites can be an indication of a gap larger than the design condition between the tube and the AVB support. The eddy current wear data is then reviewed and tubes that have wear scars larger than 20% through-wall were selected as limiting tubes to be considered in the subsequent wear evaluations. The limiting tubes were then assigned a support case from the FIV evaluation to correlate the AVBs showing wear in the eddy current data, to ineffective supports in the FIV evaluation.

The results of the eddy current data review are shown in Section 5.0 of this report. A discussion of the limiting tubes considered in the wear evaluation, as well as the support condition assigned to the limiting tube, is provided in Section 6.0.

Using the limiting tubes identified from the eddy current data, a wear model was developed for each limiting tube. The wear model requires input such as the tube excitation ratio and the active mode shapes from the FIV evaluation. This data is obtained for each of the base support cases and alternate support cases for all of the limiting tubes from the FIV evaluation. The wear model was then tuned by assuming AVB support conditions to closely match the wear data obtained from the eddy current inspection data obtained at the end of operating Cycle 16. The tuned wear model for the limiting tubes can be used to predict future wear for the next cycle at 100% power or at a reduced power level. The details of the wear evaluations are provided in Section 7.0.

In addition to the evaluation for the 100% power level, an evaluation was performed for several reduced power levels with emphasis on the 80% and 70% power levels. These reduced power level evaluations considered the effects of tubes that have already been plugged so that the evaluation considers the specific operating condition of the tube bundles for the next operating cycle. An ATHOS thermal-hydraulic evaluation, as well as FASTVIB FIV evaluation for all 79 support cases, was performed for the reduced power level conditions. The thermal-hydraulic evaluation for the reduced power level is documented in Section 3.2 and the FIV evaluation at reduced power level is documented in Section 4.5. The FIV evaluation is then input into the wear model to determine the amount of predicted tube wear possible during the next cycle of operation at a reduced power level. This wear calculation was necessary for several reasons. Any tubes exhibiting tube wear predictions that would exceed the tube performance criteria would be plugged for the next operating cycle. The wear calculation was also performed to determine the likelihood of any changes that could affect the tubes' boundary or support condition over the next operating period.

In addition to the tube wear evaluation, stability ratios for the limiting tubes were tabulated at the reduced power level. Any tubes that are expected to have an in-plane stability ratio above 1.0 at the reduced power level would then be recommended for removal from service. The wear projection for the reduced power level is documented in Section 7.3 and a discussion of in-plane instability in Unit 2 is shown in Section 8.0.

The eddy current data for the SONGS Unit 3 steam generators was also reviewed to determine if the much more severe tube wear that was experienced in the Unit 3 steam generators could influence the approach used in Unit 2. Tubes with tube-to-tube wear were evaluated, as well as neighboring tubes and other limiting tubes with large amounts of AVB wear. Tubes that were specifically of interest were tubes that have tube-to-tube wear and have AVB wear at a limited number of AVB locations. The 1814-AA086-M0238, REV. 0 Page 10 of 415

Page 10 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 review of the data can be found in Section 5.4. The ATHOS thermal-hydraulic evaluation was performed for the Unit 3 specific operating parameters and the 79 FASTVIB AVB support cases were generated. The results of the Unit 3 specific ATHOS evaluation can be found in Section 3.4 and the results of the FASTVIB FIV evaluation can be found in Section 4.6. The limiting tubes were then reviewed and in-plane stability ratios were tabulated to determine if all of the tubes that have tube-to-tube wear could be explained by an in-plane stability ratio above 1.0 or a neighboring tube that is unstable in-plane. Based on this review of the Unit 3 data, a set of criteria was developed to determine if any tube in Unit 2 should be plugged based on the observations from Unit 3. The review of the Unit 3 data and the development of the plugging criteria are documented in Section 9.0 of this report.

Section 10.0 contains recommendations for continued operation of the SONGS Unit 2 steam generators at a reduced power level.

1814-AA086-M0238, REV. 0 Page 11 of 415

Page 11 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 c

Figure 1-1 Methodology Outline 1814-AA086-M0238, REV. 0 Page 12 of 415

Page 12 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 2.0 SummarylConclusions Calculations and analysis have been performed to evaluate the potential for additional unacceptable tube vibration and wear in the SONGS Unit 2 steam generators. The analysis considered various aspects including:

• Thermal-hydraulic analysis

" Flow-induced vibration analysis considering past operation and future operation at various power levels

• Analysis of available eddy current data collected using both bobbin and RPC

• Wear projection analysis for future operation based upon prior wear and operating experience

• Evaluation of tube wear observed in Unit 3 and modification of methods used to determine acceptability of the Unit 2 tubes left in service The following is a summary of the results obtained as a result of this process. Additional detail regarding these and other aspects of the analysis performed in support of this work can be found in the body of this document.

The term 'W1uidelastic instability' or "unstabletubes'; is used in this report and relates to movement in either the out-of-plane direction or the in-plane direction. When it is used in the discussion of movement in the out-of-plane direction, it should be noted that the tube is not considered to be "unstable" in the classical sense, where displacements can increase significantly with small increases in U-bend velocity. This classical displacement cannot happen in the U-bend as the tubes would close the gaps between AVBs and prevent large displacements. Instead, calculation of the excitation ratio (ER) in the out-of-plane direction is necessary and is an important parameterthat is used in calculating future tube wear. Calculatingthis value does not imply that the tube is experiencing large unbounded displacements. The use of the terms "effective" or "ineffective" in this report also have a specific limited meaning related to whether the tube/support intersection is acting as a pinned support with no gap or as an otherwise active support with gaps that allow gap-limited fluidelastic rattling within the clearance. This is different than terminology often used when using non-linearmethodology to evaluate interactions within loose supports.

2.1 FIV Results Summary The flow-induced vibration analysis (FIV) has been performed using the FLOVIB and FASTVIB computer codes using thermal-hydraulic data developed with the ATHOS computer code. Details regarding the actual FIV analysis can be found in Section 4.0 of this report. Section 3.0 contains details of the thermal-hydraulic analysis performed for the SONGS Unit 2 and Unit 3 SGs. Fluidelastic stability ratios and excitation ratios were calculated for the in-plane and out-of-plane directions, respectively, for various boundary conditions. This was performed for various assumed power levels with results used in subsequent analysis. The following is a summary of the pertinent results found during the FIV analysis of Unit 2.

1814-AA086-M0238, REV. 0 Page 13 of 415

Page 13 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 2.1.1 Out-of-Plane Analysis indicates that if all AVBs were effective, or if one AVB was ineffective, all tubes would be stable with respect to out-of-plane fluidelastic tube excitation for the 100% power condition. As indicated earlier, out-of-plane excitation ratios calculated for the U-bend that are greater than 1.0 are not considered to be "unstable" in the classical sense. The only time where this would be considered to actually result in an unstable tube is if an excitation ratio greater than 1.0 was calculated for the condition where all supports were active. If this were the case, then the tube would not have an AVB to contact during vibration, and would hit neighboring tubes instead.

In some cases [ ]8,c or more ineffective AVBs were necessary to create a condition where the excitation ratio would be greater than 1.0. However, as has been observed during the recent inspection, there were multiple tubes found with larger than anticipated wear at the AVB support sites.

This is an indication of ineffective AVBs which, when combined with certain secondary side fluid conditions, can result in tube wear. FIV analysis has been performed for many different possible AVB support configurations. A library of 78 possible configurations (79 including the base case: all AVBs effective) was developed where essentially all tubes in the SG were evaluated for the defined support condition. Using this library of ER results, coupled with eddy current defined support conditions, it was possible to develop the inputs necessary to prepare estimates of future wear that could occur during the next cycle of operation.

2.1.2 In-Plane In addition to the out-of-plane analysis, an analysis of the potential for in-plane instability was also performed. Eddy current inspection results were used to define the support condition and the potential for in-plane instability determined for the limiting active tubes. The analysis determined that there would not be any in-plane instability for any of these active tubes using the support conditions defined by eddy current. It was noted that at operation at 70% power, the in-plane instability value dropped by about [ ]ac of the value at 100% power.

2.2 Wear Analysis Summary 2.2.1 Tube Wear Summary Westinghouse testing and consistent design methodology supports the conclusion that tube/AVB wear that could approach plugging margins within one operational cycle is caused by an amplitude or gap-limited ER mechanism within larger than expected clearances.. Section 7.2 provides a description of this mechanism and how it is incorporated into evaluation of tube/TSP wear. Application of the semi-empirical methodology to obtain observed wear patterns in the SONGS Unit 2 steam generators demonstrates that subsequent operation at any part load levels at 80% or below will not lead to unacceptable tube wear during the next operating cycle before a planned interim ISI. Note that this methodology uses the gap-limited ER mechanism to match the observed tube wear at the three consecutive AVBs having the limiting %TW wear depth at the end of the first cycle of operation. The amount of work (workrate x time) required to produce the observed wear, and the observed depths of wear, are essentially independent of the mechanism assumed to produce the starting point for the projections made for different operating load levels. Projections of future wear from the actual existing conditions using the gap-limited mechanism should be conservative for other mechanisms that assume the wear could have significant contributions from flow turbulence since excitation from the gap-limited 1814-AA086-M0238, REV. 0 Page 14 of 415

Page 14 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ER mechanism increases with wear, whereas excitation due to turbulence does not1 .

2.2.2 A VB Wear Potential The methodology used to evaluate maximum tube/AVB wear potential simultaneously calculates the conformal wear in [ ]ax. Results documented in this report have used input wear coefficients that maximize tube wear and minimize AVB wear. The reverse could be done, or any other combination of relative wear could be prescribed. In typical design calculations based on experience with Westinghouse AVB material and processing history, Iac On the other hand, there is a potential that AVBs can vibrate and cause tube wear if long, unsupported spans are created inside the bundle. The SCE root cause evaluation concluded there was no indication of AVBs vibrating and causing tube wear. However, there are several instances of AVBs having 15 or more consecutive tubes in a column with wear indications, so additional review of all available ECT data including any RPC evidence was performed. Based on the additional evaluation described in Section 7.4.2, AVBs are not likely responding in any kind of aerodynamically unstable mode, but they are likely vibrating as a response to flow turbulence in the regions having many consecutive intersections with significant tube wear. This provides additional sliding motions during impacting due to gap-limited ER excitation that exceeds levels included in the baseline shaker tests.

However, the process of matching the observed wear as a starting point for projections as described in Section 7.2.4 would account for this potential by choosing a set of parameters that produced workrates required to produce the observed result.

2.3 Potential for In-Plane Tube-to-Tube Contact and In-Plane Instability Indications of tube-to-tube wear were found on two tubes, Ri 11C81 and R1 13C81 in SG 2E089. The indications on these tubes were located at the same free span location in the U-bend and were considered to be a result of contact between these two tubes. This was the only tube pair that was found with this kind of indication in the Unit 2 steam generators. Initially there was consideration given that this tube-to-tube contact was a direct result of in-plane motion resulting from in-plane instability.

However, the analysis that was performed and documented in Section 7.5 and Appendix B determined that the tube wear at this location was most likely a result of the close proximity of these two tubes.

This proximity was initially believed to be initiated during assembly of the steam generator and may have been exacerbated during operation of the SG as a result of SG temperature and pressure changes. Since there is only a limited amount of interference possible, the tubes would wear until the tubes are no longer in contact and will cease wearing. This condition is called 'wear arrest' and is applicable to Tubes RI 11 C81 and R1 13C81 in SG 2E089. However, a more detailed review of the available eddy current data contained in Appendix B suggests that the tubes were initially in contact as a result of conditions associated with SG manufacturing and then became worn due to FIV. After a period of operation the tube became displaced, or skipped to a new location, and tube-to-tube wear Note that the rate of increasing wear depth still tends to decrease with continued operation as a result of the depth-volume relationship and sharing of energy among all affected intersections.

1814-AA086-M0238, REV. 0 Page 15 of 415

Page 15 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 stopped. The skip has been identified through review of the available eddy current information and is discussed in detail in Appendix B.

The review of the Unit 3 eddy current data was useful in that it helped establish criteria that would determine if any additional tubes beyond those already plugged tubes should be removed from service to preclude the potential for vibration in the in-plane direction which could result in tube-to-tube contact.

One feature that was noted for all of the tubes with free span wear in the Unit 3 tube sample was the presence of wear at the top TSP. All tubes that had free span wear also had indications of top TSP wear, or were in contact with tubes that had top TSP wear. It is notable that neither of these two tubes had this feature. Since this feature was not found, it would also support the conclusion that these tubes were not moving in the in-plane direction.

Additional analysis was performed to determine the potential for in-plane motion associated with fluid-elastic instability in any of the remaining active tubes. This is documented in Section 8.1 and Section 7.3.4 of this report. Through analysis of the available eddy current data, it was determined that there were no indications of in-plane motion in any of the tubes. This also included the tubes with tube-to-tube wear as discussed earlier. This conclusion was made by reviewing the wear scars at the AVB support locations and determining that there was no wear outside the location where the tube was supported by the AVB. This is a clear indication that in-plane motion was not occurring; else there would be indications of rubbing/wear at locations not covered by the AVB. Since the SGs will operate at reduced power levels during the next period of operation, and any potential for wear is reduced at lower power levels, the likelihood of any in-plane motion is greatly reduced. As an order of magnitude, calculations indicate that a reduction from 100% power to 70% power will reduce the in-plane stability ratios by about one-half the values calculated at 100% power conditions.

As a result of the above, it was concluded that significant tube-to-tube wear would not be projected to occur during the next cycle of operation of Unit 2.

2.4 Modification of Plugging Criteria Considering Unit 3 Data The Unit 3 eddy current data was reviewed to determine if any additional information could be obtained that would allow definition of a more conservative approach that could be used to justify the remaining active tubes in the Unit 2 steam generators. As a result of this process the following criteria were developed:

Criterion 1- Free span tube-to-tube contact/wear Criterion 2- Wear outside AVB sites Criterion 3- Ineffective AVB sites and in-plane motion Criterion 4- Wear at top TSP in combination with wear at multiple AVBs Criterion 5- Ineffective AVBs and OP wear potential Specific details describing the above criteria can be found in Section 9.0 of this report. With the exception of Criterion 4, the application of the above criteria for the Unit 2 tubes did not result in additional tubes recommended for plugging. However, application of the more conservative criteria resulted in the identification of additional tubes that would be recommended for plugging at various power levels. Table 2-1 provides a summary of the tubes.

1814-AA086-M0238, REV. 0 Page 16 of 415

Page 16 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 2.5 Summary and Recommendations Analysis has shown that the wear observed at the AVB locations in the SONGS Unit 2 steam generators were produced as a result of out-of-plane motion associated with the gap-limited ER mechanism. There were no indications of in-plane instability, even for the tubes found with tube-to-tube wear. All tube wear at AVB locations was found to be consistent with an out-of-plane mechanism.

The wear analysis indicates that SCE can operate the SONGS Unit 2 steam generators without significant additional tube wear at power levels of at least 80% at the current plugging level. The analysis has determined that no tubes were found to be unstable in the in-plane direction. The gap-limited displacement ER mechanism will cause some of the tubes to experience additional wear over the next period of operation. However, the amount of wear associated with that mechanism would be manageable over that period of time with maximum additional wear on both active and plugged tubes expected to be less than 1.5 mils. Note that operation of the steam generators with wear produced by this mechanism is not uncommon in Westinghouse steam generators as long as the amount of wear that could occur during operation is small (most often less than the ECT detection threshold).

The amount of wear that has been experienced at the SONGS Unit 2 SGs during the prior operating cycle is larger than what would normally be considered acceptable. As a result, certain actions have been taken by SCE to reduce the likelihood of a tube leakage event. This includes plugging and stabilizing certain tubes with large wear scars, including tubes with little or no wear in the affected zone.

Westinghouse also recommends plugging up to 15 additional tubes as described in Table 2-1 as a preventive measure. In addition to these actions, Westinghouse recommends that SCE operate the SONGS Unit 2 SGs at a 70% power level for the next 6 month period. However, additional analysis was also performed tht demonstrated acceptable operation for at least 18 months.

1814-AA086-M0238, REV. 0 Page 17 of 415

Page 17 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 2-1 Tube Plugging Recommendation Steam Generator 2E088 Steam Generator 2E089 80% Power 70% Power 80% Power 70% Power Row Column Row Column Row Column Row Column 113 81 135 93 80 68 80 68 134 88 137 89 103 97 104 72 135 91 104 72 132 94 135 93 116 96 137 89 120 96 126 78 132 94 134 88 134 92 138 90 1814-AA086-M0238, REV. 0 Page 18 of 415

Page 18 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 3.0 ATHOS Analysis An ATHOS model of the SONGS Unit 2, MHI SG Model 116TT-1, RSGs was developed to provide thermal-hydraulic (TH) parameters using the Westinghouse version of the ATHOS code. The Westinghouse version of the ATHOS code has modifications and upgrades described in Appendix B of Reference 3-1 and is the methodology used by Westinghouse for designing RSGs and SGs for new plants. The model is used to compute the three-dimensional (3-D) thermal-hydraulic parameters: void fractions, quality, densities, and gap velocities for all tubes in the tube bundle. These parameters are used for flow-induced vibration (FIV) and wear evaluations of the Unit 2 RSGs to support the operational assessment and restart efforts.

a,b,c,e 3.1 Analysis Methods The thermal-hydraulic analysis of the SONGS Unit 2 RSGs is performed using the ATHOS (Analysis of the Thermal Hydraulics of Steam Generators) code. ATHOS is a three-dimensional computational fluid dynamics (CFD) code for analyzing steam generator (SG) thermal-hydraulic performance characteristics (Reference 3-5). Westinghouse used the current version of the code, ATHOS60, Version 3.0, referred to as ATHOS in this report (References 3-6 through 3-8).

ATHOS analysis of a SG involves the execution of a suite of codes consisting of the pre-processors ATHOGPP and PLATES, the ATHOS solver, and the post-processor VGUB. A brief overview of these codes follows.

3.1.1 Descriptionof Computer Codes ATHOGPP The pre-processor, ATHOGPP, calculates the geometric parameters required for the ATHOS thermal-hydraulic analysis. For each node the code computes: the secondary fluid volume, the flow areas in the R, 0, and Z directions, the heat transfer and friction surface areas, the approach to device area ratios required to compute pressure drops through concentrated resistances (flow distribution and tube support plates, primary separator entrance, etc.), and the primary fluid flow partitioning factor. The input parameters include: grid distribution in R, 0, and Z directions, shell and shroud (wrapper) dimensions, tube layout and individual tube dimensions as well as the location (row and column numbers) of plugged tubes, inlet (feedwater) and primary separator locations and dimensions, as well as the location of all internal devices (tube support plates, stay-cylinders, etc.). Geometry data processed by ATHOGPP are then transferred via a binary file (TAPE20) to the PLATES code for further refinement of the flow areas through the tube support plates.

a,c,e 1814-AA086-M0238, REV. 0 Page 19 of 415

Page 19 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e PLATES

[

]a,c,e ATHOS The ATHOS code module solves the governing conservation equations in conjunction with empirical correlations and boundary conditions.

a,c,e

[

a,b,c,e VGUB The post-processor, VGUB, calculates tube gap velocity, density, and void fraction distributions along the steam generator tubes. These data are used in tube vibration and wear analyses. Local tube gap 1814-AA086-M0238, REV. 0 Page 20 of 415

Page 20 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 velocities are calculated from ATHOS cell velocities which are based on the porous media concept. In general, gap velocity components normal to the tube (cross flow) are used in flow-induced vibration and wear analyses since these components produce significantly greater tube vibration than components parallel to the tube (axial flow).

a,c,e 3.1.2 Discussion of Significant Assumptions

1. Thermal-hydraulic conditions for ATHOS calculations are based on operating conditions specified in Reference 3-4.

2. [

]a,c.e 3.[

Ia,c,e

4. [

a,b,c,e 5.

a,b,c,e 6.

Ia,c,e 1814-AA086-M0238, REV. 0 Page 21 of 415

Page 21 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 7.

Ia,b,c,e 8.

Ia,c,e 3.1.3 Acceptance Criteria The ATHOS code calculations are acceptable if all of the following criteria are satisfied (References 3-5 and 3-16). Note that if a criterion cannot be satisfied then sufficient justification is required.

1. b,c,e 2.

a,b,c,e

3. [

Ia,b,c,e 4.[

Ia,b,c,e 3.1.4 Input Steam Generator Geometry The ATHOS model covers the secondary side flow field inside the steam generator shell from the top surface of the tubesheet to the lower deck plate and from the center of the wrapper-to-wrapper wall and the downcomer annulus between the wrapper and the shell walls. The finite difference grid is based on the cylindrical coordinate system. Design geometry and thermal-hydraulic symmetry is assumed with respect to the diametrical plane perpendicular to the tube lane. Because of this assumption, the analysis model consists of one-half of the steam generator, i.e., an 180'-sector encompassing one-half of the hot leg side and one-half of the cold leg side.

a,c,e The ATHOS Geometry pre-processor also included the following inputs:

1. General Geometrical Input Data

2. Grid Specification Data 1814-AA086-M0238, REV. 0 Page 22 of 415

Page 22 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013

3. Inlet/Outlet Port Data

4. Shell and Shroud (Wrapper) Data

5. Vertical Divider Plate and Impingement Plate Data

6. Separator Deck Data

7. Distribution Plate Data

8. Tube Support Plate and Baffle (Wrapper) Data - Horizontal

9. Tube Support Plate and Baffle (Wrapper) Data - Vertical

10. Tube Bundle Data

11. Primary Separator Lower Deck Plate Flow Areas

12. Anti-Vibration Bar (AVB) Data

13. Tube Plugging Data a,b,c,e ATHOS Thermal-Hydraulic Module ATHOS inputs were prepared for the operating conditions specified in Reference 3-4.

a,b,c,e 1814-AA086-M0238, REV. 0 Page 23 of 415

Page 23 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c,e 1814-AA086-M0238, REV. 0 Page 24 of 415

Page 24 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-1 SONGS Units 2 and 3 RSGs: R-0 Finite Difference Grid IX Circumferential Grid Radial Grid (YV) at Radial Grid (YV)

(XU) IY Tubesheet at Lower Deck a b,c,e (Degrees) (inches) (inches)

I *4 4. 4-I -I

• 4-4 4

• I.

-4 4

• 4-4 4

• I-4 4 4. 4.

4 4 4. 4.

I 4 4. I-

-~

I

_____ I I I

1814-AA086-M0238, REV. 0 Page 25 of 415

Page 25 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-2 SONGS Units 2 and 3 RSGs: Axial Direction (Z) Finite Difference a,u,c,e Grid 1814-AA086-M0238, REV. 0 Page 26 of 415

Page 26 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-3 SONGS Unit 2 RSG 2E088 Tube Plugging List (Reference 3-3) a,b,e 1814-AA086-M0238, REV. 0 Page 27 of 415

Page 27 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-4 SONGS Unit 2 RSG 2E089 Tube Plugging List (Reference 3-3) a,b,e 1814-AA086-M0238, REV. 0 Page 28 of 415

Page 28 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-5 SONGS Unit 2 RSGs: Basic Operating Parameters (References 3-1 and 3-4)

Parameter Value a, b,e

.... )

t I

• I 1814-AA086-M0238, REV. 0 Page 29 of 415

Page 29 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c,e Figure 3-1 SONGS Units 2 and 3 RSGs: ATHOS Finite Difference Grid in the Horizontal (R-e) Plane 1814-AA086-M0238, REV. 0 Page 30 of 415

Page 30 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,bc,e Figure 3-2 SONGS Units 2 and 3 RSGs: ATHOS Finite Difference Grid in the Vertical (R-0) Plane 1814-AA086-M0238, REV. 0 Page 31 of 415

Page 31 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 3.2 Power Levels The ATHOS family of codes, consisting of the pre-processors ATHOGPP and PLATES, the ATHOS thermal-hydraulic module, and the post-processor VGUB, were executed to determine the thermal-hydraulic characteristics of the SONGS Unit 2 RSGs for the operating conditions specified in Reference 3-4. [

a,b,c,e 3.3 Results Summary Ia,b,c,e 1814-AA086-M0238, REV. 0 Page 32 of 415

Page 32 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c,e Local Flow Conditions along Tubes VGUB (Reference 3-15) calculates the local flow conditions for all tubes in the bundle for input to the tube vibration and wear analysis to support the operational assessment of the Unit 2 RSGs. Local tube gap velocities are calculated from ATHOS cell velocities based on the cell porosity and the characteristic geometry of the tube array (pitch and diameter). Output from VGUB is written to a binary 1814-AA086-M0238, REV. 0 Page 33 of 415

Page 33 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 file (TAPE7) which contains local flow conditions for all tubes in the bundle. TAPE7 binary file is used for tube vibration and wear evaluations.

a,b,c,e 1814-AA086-M0238, REV. 0 Page 34 of 415

Page 34 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-6 Summary of ATHOS Convergence Parameters a,b,c Ii

£0 0~

iE~

ii'.

jII~

I I,ai~i'Iii I 'p 0iii

£ I

2'in I-jI~

2 3

1814-AA086-M0238, REV. 0 Page 35 of 415

Page 35 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-7 Summary of ATHOS Convergence Parameters at 100% Power (Reference 3-1)

Parameter Target Initial Run Restart 1 Restart 2 Comment b,c Values 1

1814-AA086-M0238, REV. 0 Page 36 of 415

Page 36 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-S Summary of ATHOS Results ji 1814-AA086-M0238, REV. 0 Page 37 of 415

Page 37 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-3 SONGS RSG 2E089 Tube Row 141/Col. 89: Comparison of Gap Velocities at 50% Power 1814-AA086-M0238, REV. 0 Page 38 of 415

Page 38 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-4 SONGS RSG 2E089 Tube Row 141/Col. 89: Comparison of Gap Velocities at 60% Power 1814-AA086-M0238, REV. 0 Page 39 of 415

Page 39 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-5 SONGS RSG 2E088 Tube Row 141/Col. 89: Comparison of Gap Velocities at 70% Power 1814-AA086-M0238, REV. 0 Page 40 of 415

Page 40 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-6 SONGS RSG 2E089 Tube Row 1411Col. 89: Comparison of Gap Velocities at 70% Power 1814-AA086-M0238, REV. 0 Page 41 of 415

Page 41 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-7 SONGS RSG 2E089 Tube Row 141/Co1. 89: Comparison of Gap Velocities at 80% Power 1814-AA086-M0238, REV. 0 Page 42 of 415

Page 42 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-8 SONGS RSG89 High Column ATHOS Results of Velocity, Void and Quality at 50% Power 1814-AA086-M0238, REV. 0 Page 43 of 415

Page 43 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-9 SONGS RSG89 High Column ATHOS Results of Velocity, Void and Quality at 60% Power 1814-AA086-M0238, REV. 0 Page 44 of 415

Page 44 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 abc Figure 3-10 SONGS RSG89 High Column ATHOS Results of Velocity, Void and Quality at 70% Power 1814-AA086-M0238, REV. 0 Page 45 of 415

Page 45 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 abc Figure 3-11 SONGS RSG89 High Column ATHOS Results of Velocity, Void and Quality at 80% Power 1814-AA086-M0238, REV. 0 Page 46 of 415

Page 46 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 3.4 Unit 3 Operating Conditions In this section, the ATHOS analysis of the Unit 3 RSGs at the representative operating conditions, from Reference 3-17, for the February 2011 through January 2012 operating period is compared with the ATHOS analysis documented in Section 3.3. These additional evaluations were performed and documented in Reference 3-18 to demonstrate the applicability of Westinghouse methodology to the more severe conditions observed in Unit 3.

a,b,c,e 1814-AA086-M0238, REV. 0 Page 47 of 415

Page 47 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,bc,e Local Flow Conditions alona Tubes

[

Ia,b,c,e 1814-AA086-M0238, REV. 0 Page 48 of 415

Page 48 of 414 LTR-SGDA-1 2-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-9 Unit 3 RSGs: Primary and Secondary Fluid Parameters for February 2011 through January 2012 Operating Period ParaeteRS3E88RSGE89 Design Conditions Paraete RS3EB8RSGE89(Reference 3-1) a,b,c

__1-I-I_

4 I 4 I 1814-AA086-M0238, REV. 0 Page 49 of 415

Page 49 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-10 Summary of ATHOS Convergence Parameters Parameter Target Initial Restart I Restart 2 Comment b,c Values Run I1 I i 1814-AA086-M0238, REV. 0 Page 50 of 415

Page 50 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 3-11 Summary of ATHOS Results Parameter Design Condtions Operating Condtions I (Reference 3-1) Unit 3 Plant Data a,b,c t

• 4.

4. 4.

4.

4

4. 4.

4. 1.

4. 4.

4. 4.

I. I.

4. 4.

4. 4.

U. I 1814-AA086-M0238, REV. 0 Page 51 of 415

Page 51 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-12 Secondary Quality Contours along the Plane of Symmetry (IX = 1 and 30) 1814-AA086-M0238, REV. 0 Page 52 of 415

Page 52 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-13 Void Fraction Contours along the Plane of Symmetry (IX = I and 30) 1814-AA086-M0238, REV. 0 Page 53 of 415

Page 53 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Figure 3-14 Secondary Fluid Velocity Contours along the Plane of Symmetry (IX = 1 and 30) 1814-AA086-M0238, REV. 0 Page 54 of 415

Page 54 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-15 Secondary Fluid Quality Contours above 7 th Tube Support Plate (IZ=36) 1814-AA086-M0238, REV. 0 Page 55 of 415

Page 55 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-16 Void Fraction Contours above 7 th Tube Support Plate (IZ=36) 1814-AA086-M0238, REV. 0 Page 56 of 415

Page 56 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-17 Secondary Fluid Quality Contours at the Plane of Maximum Quality (IZ=45) 1814-AA086-M0238, REV. 0 Page 57 of 415

Page 57 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-18 Void Fraction Contours at the Plane of Maximum Quality (IZ=45) 1814-AA086-M0238, REV. 0 Page 58 of 415

Page 58 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c

)

Figure 3-19 Tube Row 141/Co1. 89: Comparison of Gap Velocities at Unit 3 and Design Conditions 1814-AA086-M0238, REV. 0 Page 59 of 415

Page 59 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 3-20 Tube Row 141/Col. 89: Comparison of Void Fractions at Unit 3 and Design Conditions 1814-AA086-M0238, REV. 0 Page 60 of 415

Page 60 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 abc Figure 3-21 Tube Row 141/Co1. 89: Comparison of Fluid Mixture Densities at Unit 3 and Design Conditions 1814-AA086-M0238, REV. 0 Page 61 of 415

Page 61 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 3.5 References 3-1. CN-SGMP-12-13, Revision 1, "Thermal-Hydraulic Analysis of the San Onofre Nuclear Generating Station Units 2 and 3 Replacement Steam Generators," September 2012.

3-2. CN-SGMP-12-15, Revision 2, "Thermal-Hydraulic Analysis of the SONGS Unit 2 RSGs at Part Load Conditions to Support Operational Assessment," September 2012.

3-3. E-mail from David Calhoun (Southern California Edison) to Daniel Merkovsky (Westinghouse),

Subject:

"New SONGS Schedule Item for Westinghouse," May 22, 2012, (Included in Appendix A of Reference 3-2).

3-4. MHI Report, L5-04GA567, Rev. 4, "San Onofre Nuclear Generating Station, Units 2 & 3 Replacement Steam Generators Evaluation of Stability Ratio for Return to Service," July 21, 2012.

3-5. EPRI-NP-4604-CMM, "ATHOS3: A Computer Program for the Thermal-Hydraulic Analysis of Steam Generators," July 1986.

3-6. LTR-SGDA-08-148, "Software Release Letter for Modules of the ATHOS Family of Codes and Executable Scripts: GPP60 Version 4.0, RUNATHOGPP Version 1.4, PLATES60 Version 3.0, and RUNPLATES Version 1.4," June 13, 2008.

3-7. LTR-NCE-07-48, "Software Release Letter for ATHOS Codes and Scripts GPP60 Revision 3.0, RUNATHOGPP Version 1.3, ATHOS60 Version 3.0, and RUNATHOS Version 1.3," April 2, 2007.

3-8. LTR-SGDA-05-63, "Software Release Letter for Specific ATHOS Family Codes: Software Changes Specification and Validation for Version 4.0 of Codes PLTATHOS and VGUB on HP-UX 11.0," March 24, 2005.

3-9. LTR-NCE-08-1 1, Rev. 1, "User's Manual for the Newly Added Features to ATHOGPP Version 3.0 and PLATES Version 2.0 Computer Codes," February 29, 2008.

3-10. WNEP-9639, Rev. 1, "Modification and Qualification of ATHOGPP Code to Simulate AVBs for ATHOS Analysis," October 20, 1996.

3-11. CN-SGMP-12-12, Rev. 1, "Software Changes to ATHOGPP for Modeling of SONGS RSG Units 2 and 3 Anti-vibration Bars," June, 2012.

3-12. WNEP-9640, Rev. 1, "PLATES Code User's Manual (Feedring Design Version of PLATES),"

October 20, 1996.

3-13. MHI Report, L5-04GA510, Rev. 5, "San Onofre Nuclear Generating Station, Units 2 & 3 Replacement Steam Generators Thermal and Hydraulic Parametric Calculations," November 12, 2008.

3-14. LTR-NCE-04-105, "User's Manual for the Version 4.0 of PLTATHOS and VGUB to Read SG Model Data at Execution Time," February 11, 2005.

3-15. WNEP-9642, Rev. 1, "VGUB Code User's Manual STD-UM-87-00003090," October 1, 1996.

3-16. LTR-NCE-08-26, Rev. 1, "Guideline on Convergence Parameters Affecting ATHOS3 Solution,"

May 13, 2008.

1814-AA086-M0238, REV. 0 Page 62 of 415

Page 62 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 3-17. E-mail from Brian Sarno (Southern California Edison) to Damian A. Testa (Westinghouse),

Subject:

"SONGS Operating Conditions," March 16, 2012, (Included in Appendix A of Reference 3-18).

3-18. CN-SGMP-12-17, Revision 2, "Thermal-Hydraulic Analysis of the SONGS Unit 3 Replacement Steam Generators for the February 2011 through January 2012 Operating Period," September 2012.

1814-AA086-M0238, REV. 0 Page 63 of 415

Page 63 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.0 Flow-Induced Vibration Analysis 4.1 FIV Introduction Flow-induced vibration models of the SONGs MHI replacement steam generators were developed to evaluate the effects of secondary side flow on the tubes. The FIV models included the 7 tube support plates along with the 6 anti-vibration bars, which provide support to the tube at up to 12 locations. Figure 4-1 contains a representative sketch of the model used in the analysis. Table 4-1 contains a listing of the various cases considered with respect to the boundary conditions at the AVB that were imposed on the model. Figure 4-2 contains the description of the AVB numbering system used in this analysis. The FIV analysis was performed with the FASTVIB and FLOVIB computer codes using thermal-hydraulic input developed using the ATHOS computer code. The post-processor that interpolates tube-specific gap velocities from the ATHOS volumetric output recognizes the actual boundary conditions around the periphery of the bundle, therefore gap velocities for tubes in Row 142 are not as large as for tubes in Row 141. This effect can be observed in the figures contained in Section 4.3 where the outermost tubes have slightly lower tube excitation ratios than the neighboring in-board tube. FASTVIB calculates relevant FIV responses for all tubes in a given row, and as can be observed in Section 4.3, multiple rows are considered. The result is a 'tubesheet' map of responses that help to identify regions that are more susceptible to FIV for a given support condition.

There are several tasks to be completed with respect to the FIV evaluation. The first task is to develop tube excitation information for power levels of 100%, 80%, 70%, 60% and 50%. The next task is to provide the input necessary to complete the wear evaluations for the tubes of interest specified in Section 6 of this report. In addition to these tasks, there was also a comparative study performed to determine the impact on the FIV response as a result of plugging a tube and whether or not the plugged tube contained a stabilizer. Another comparison was performed to determine the difference between the 2E088 and 2E089 steam generators as well as low column tubes and the high column tubes (symmetry concerns).

Tubes that were plugged in the steam generators were not symmetrical about the center column of the tube bundle and the same tubes were not plugged in both steam generators. As a result, potentially different thermal-hydraulic conditions could exist. The purpose of this comparison was to determine the impact that non-uniform plugging has on the FIV evaluations.

1814-AA086-M0238, REV. 0 Page 64 of 415

Page 64 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 Possible AVB Support Cases with Adjacent Missing AVBs FASTVIB - FLOVIB Case Descriptions AVB Number All Case0 0 Supported Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to 47 1 2 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. noa 9 n.a n.a. 12 AVB 1 Case1 1 Missing Group1 Rows 48 to 142 X 2 3 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 X 2 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 X n.a n~a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2 Case2 1 Missing Group1 Rows 48 to 142 1 X 3 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 X 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 3 Case3 1 Missing Group1 Rows 48 to 142 1 2 X 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 2 X 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 4 Case4 1 Missing Group1 Rows 48 to 142 1 2 3 X 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 2 3 X 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n~a n.a. n.a 9 n.a n.a. 12 AVB 5 Case5 1 Missing GroupI Rows 48 to 142 1 2 3 4 X 6 7 8 9 10 11 12 Group2 Rows 27to47 1 2 3 4 X n~a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 naa na n.a. n.a 9 n. n.a. 12 1814-AA086-M0238, REV. 0 Page 65 of 415

Page 65 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 6 Case6 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 X 7 8 9 10 11 12 Group2 Rows 27to47 1 2 3 4 5 n~a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n~a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 7 Case7 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 X 8 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n~a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n~a n.a. n.a 9 n.a n.a. 12 AVB 8 Case8 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 X 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a na. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 9 Case9 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 X 10 11 12 Group2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n~a n.a. 12 AVB 10 Case 10 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 9 X 11 12 Group2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 X 11 12 Group 3 Rows 15to26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a nma n.a. n.a 9 n.a n.a. 12 AVB 11 Case 11 1 Missing Group1 Rows48to142 1 2 3 4 5 6 7 8 9 10 X 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 10 X 12 Group 3 Rows 15to 26 1 n.a n.a 4 5 n.a n~a. 8 9 nma n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 66 of 415

Page 66 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 12 Case 12 1 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 9 10 11 X Group2 Rows 27 to 47 1 2 3 4 5 n.a n.a. 8 9 10 11 X Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. X AVB 1, 2 Case 13 2 Missing Group1 Rows 48 to 142 X X 3 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 X X 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 X n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1to 14 X n.a n.a 4 n.a na n.a. n.a 9 n.a n.a. 12 AVB 2, 3 Case 14 2 Missing Group1 Rows 48 to 142 1 X X 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 X X 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 3, 4 Case 15 2 Missing Group1 Rows 48 to 142 1 2 X X 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 2 X X 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 4,5 Case 16 2 Missing Group1 Rows 48 to 142 1 2 3 X X 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 2 3 X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15to26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 5, 6 Case 17 2 Missing Group1 Rows48to142 1 2 3 4 X X 7 8 9 10 11 12 Group 2 Rows 27 to47 1 2 3 4 X n.a n.a. 8 9 10 11 12 Group 3 Rows 15to 26 1 n.a n.a 4 X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 I ________L......I ________ _________

__________I 1814-AA086-M0238, REV. 0 Page 67 of 415

Page 67 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 6, 7 Case 18 2 Missing Group1 Rows 48 to 142 1 2 3 4 5 X X 8 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 7, 8 Case 19 2 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 X X 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 8, 9 Case 20 2 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 X X 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 9, 10 Case 21 2 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 X X 11 12 Group2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 10, 11 Case 22 2 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 9 X X 12 Group2 Rows27to47 1 2 3 4 5 n.a n.a. 8 9 X X 12 Group 3 Rows 15to26 1 n.a n.a 4 5 n.a na. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 11, 12 Case 23 2 Missing Group1 Rows48to142 1 2 3 4 5 6 7 8 9 10 X X Group2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 10 X X Group 3 Rows 15to26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. X Group 4 Rows 1 to 14 1 n.a noa 4 n~a n.a n.a. n.a 9 n.a n.a. X 1814-AA086-M0238, REV. 0 Page 68 of 415

Page 68 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 1, 2, 3 Case 24 3 Missing Group1 Rows 48 to 142 X X X 4 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 X X X 4 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15to26 X n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4 Case 25 3 Missing Group1 Rows48to142 1 X X X 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 1 X X X 5 na n.a. 8 9 10 11 12 Group 3 Rows 15to26 1 n.a n.a X 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 3, 4, 5 Case 26 3 Missing Group1 Rows 48 to 142 1 2 X X X 6 7 8 9 10 11 12 Group2 Rows27to47 1 2 X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15to26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows Ito 14 1 n.a n.a X n~a n.a n.a. n.a 9 n.a n.a. 12 AVB 4, 5, 6 Case 27 3 Missing Group1 Rows 48 to 142 1 2 3 X X X 7 8 9 10 11 12 Group 2 Rows27to47 1 2 3 X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n~a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. nma 9 n.a n.a. 12 AVB 5, 6, 7 Case 28 3 Missing Group I Rows 48 to 142 1 2 3 4 X X X 8 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 6, 7, 8 Case 29 3 Missing Group1 Rows 48 to 142 1 2 3 4 5 X X X 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 69 of 415

Page 69 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 7, 8, 9 Case 30 3 Missing Group I Rows 48 to 142 1 2 3 4 5 6 X X X 10 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows ito 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a na. 12 AVB 8, 9, 10 Case 31 3 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 X X X 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 9, 10, Case 32 3 11 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 X X X 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 X X X 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 10, 11, Case 33 3 12 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 8 9 X X X Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 9 X X X Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 9 n.a n.a. X Group 4 Rows 1 to 14 1 n~a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. X AVB 1, 2, 3, Case 34 4 4Missing Group1 Rows 48 to 142 X X X X 5 6 7 8 9 10 11 12 Group 2 Rows 27to47 X X X X 5 n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 X n.a n.a X 5 n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4, Case 35 4 5Missing Group1 Rows 48 to 142 1 X X X X 6 7 8 9 10 11 12 Group 2 Rows 27 to 47 1 X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 70 of 415

Page 70 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 3, 4, 5, Case 36 4 6Missing Group1 Rows 48 to 142 1 2 X X X X 7 8 9 10 11 12 Group2 Rows 27to47 1 2 X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a na. 12 AVB 4, 5, 6, Case 37 4 7Missing Group1 Rows 48 to 142 1 2 3 X X X X 8 9 10 11 12 Group 2 Rows 27 to47 1 2 3 X X n.a na. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 5, 6, 7, Case 38 4 8Missing Group1 Rows 48 to 142 1 2 3 4 X X X X 9 10 11 12 Group 2 Rows 27to47 1 2 3 4 X n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 6, 7, 8, Case 39 4 9Missing Group1 Rows 48 to 142 1 2 3 4 5 X X X X 10 11 12 Group2 Rows 27to47 1 2 3 4 5 n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 7, 8, 9, Case 40 4 10 Missing Group 1 Rows 48 to 142 1 2 3 4 5 6 X X X X 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows i to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 8, 9, 10, 11 Case 41 4 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 7 X X X X 12 Group2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 71 of 415

Page 71 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 9, 10, 11, 12 Case 42 4 Missing Group I Rows 48 to 142 1 2 3 4 5 6 7 8 X X X X Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. 8 X X X X Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. 8 X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. X AVB 1, 2, 3, Case 43 5 4,5Missing Group1 Rows 48 to 142 X X X X X 6 7 8 9 10 11 12 Group 2 Rows 27 to 47 X X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4, Case 44 5 5,6Missing Group1 Rows 48 to 142 1 X X X X X 7 8 9 10 11 12 Group 2 Rows 27to47 1 X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows ito 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 3, 4, 5, Case 45 5 6,7Missing Group1 Rows 48 to 142 1 2 X X X X X 8 9 10 11 12 Group 2 Rows 27to47 1 2 X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 4, 5, 6, Case 46 5 7,8Missing Group1 Rows 48 to 142 1 2 3 X X X X X 9 10 11 12 Group2 Rows 27to47 1 2 3 X X n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 a.a n.a X X n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 5, 6, 7, Case 47 5 8,9Missing Group1 Rows 48 to 142 1 2 3 4 X X X X X 10 11 12 Group 2 Rows 27to47 1 2 3 4 X n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 72 of 415

Page 72 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 6, 7, 8, 9,10 Case 48 5 Missing Group1 Rows 48 to 142 1 2 3 4 5 X X X X X 11 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X 11 12 Group 3 Rows 15to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 7, 8, 9, 10, 11 Case49 5 Missing Group I Rows 48to 142 1 2 3 4 5 6 X X X X X 12 Group 2 Rows27to47 1 2 3 4 5 n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 8, 9, 10, 11, 12 Case 50 5 Missing Group i Rows 48 to 142 1 2 3 4 5 6 7 X X X X X Group 2 Rows27to47 1 2 3 4 5 n.a n.a. X X X X X Group 3 Rows 15to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. X AVB 1, 2, 3, 4,5, 6 Case 51 6 Missing Group1 Rows48to142 X X X X X X 7 8 9 10 11 12 Group 2 Rows27to47 X X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15to26 X n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4, 5,6,7 Case 52 6 Missing Group1 Rows48to142 1 X X X X X X 8 9 10 11 12 Group 2 Rows 27to47 1 X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15to 26 1 n.a n.a X X n.a n.a. 8 9 n.a na. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 73 of 415

Page 73 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 3, 4, 5, 6,7,8 Case 53 6 Missing Group1 Rows 48 to 142 1 2 X X X X X X 9 10 11 12 Group 2 Rows 27to47 1 2 X X X n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 4, 5, 6, 7,8,9 Case 54 6 Missing Group1 Rows 48 to 142 1 2 3 X X X X X X 10 11 12 Group 2 Rows 27to47 1 2 3 X X n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n~a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 5, 6, 7, 8,9,10 Case 55 6 Missing Group 1 Rows 48 to 142 1 2 3 4 X X X X X X 11 12 Group 2 Rows 27to47 1 2 3 4 X n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 6, 7, 8, 9, 10, 11 Case 56 6 Missing Group1 Rows 48 to 142 1 2 3 4 5 X X X X X X 12 Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. 12 AVB 7, 8, 9, 10, 11, 12 Case 57 6 Missing Group1 Rows 48 to 142 1 2 3 4 5 6 X X X X X X Group2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. X 1814-AA086-M0238, REV. 0 Page 74 of 415

Page 74 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 1, 2, 3, 4,5,6,7 Case 58 7 Missing Group1 Rows 48 to 142 X X X X X X X 8 9 10 11 12 Group 2 Rows 27to47 X X X X X n.a n.a. 8 9 10 11 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. 8 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4, 5,6,7,8 Case 59 7 Missing Group1 Rows48to142 1 X X X X X X X 9 10 11 12 Group 2 Rows 27to47 1 X X X X n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n~a. n.a 9 n.a n.a. 12 AVB 3, 4, 5, 6,7,8,9 Case 60 7 Missing Group1 Rows48to142 1 2 X X X X X X X 10 11 12 Group 2 Rows 27to47 1 2 X X X n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X noa n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n~a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 4, 5, 6, 7,8,9,10 Case 61 7 Missing Group1 Rows 48 to 142 1 2 3 X X X X X X X 11 12 Group 2 Rows27to47 1 2 3 X X n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n~a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 5, 6, 7, 8,9,10,11 Case 62 7 Missing Group1 Rows 48 to 142 1 2 3 4 X X X X X X X 12 Group2 Rows 27to47 1 2 3 4 X n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. X X n.a n.a. 12 1 Group 4 Rows 1 to 14 1 n.a n.a 4 noa n.e n.e. n.e X n.a n.a. 12 1814-AA086-M0238, REV. 0 Page 75 of 415

Page 75 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 6, 7, 8, 9, 10, 11, 12 Case 63 7 Missing Group1 Rows 48 to 142 1 2 3 4 5 X X X X X X X Group 2 Rows 27to47 1 2 3 4 5 n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a 4 5 n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n~a 4 n.a n.a n.a. n.a X n.a n.a. X AVB 1, 2, 3, 4,5,6,7,8 Case 64 8 Missing Group1 Rows 48 to 142 X X X X X X X X 9 10 11 12 Group 2 Rows 27to47 X X X X X n.a n.a. X 9 10 11 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. X 9 n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a 9 n.a n.a. 12 AVB 2, 3, 4, 5,6,7,8,9 Case 65 8 Missing Group I Rows 48 to 142 1 X X X X X X X X 10 11 12 Group 2 Rows 27 to 47 1 X X X X n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a na. 12 AVB 3, 4, 5, 6,7,8,9,10 Case 66 8 Missing Group1 Rows 48 to 142 1 2 X X X X X X X X 11 12 Group 2 Rows 27 to 47 1 2 X X X n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 4, 5, 6, 7, 8, 9, 10, Case 67 8 11 Missing Group i Rows 48 to 142 1 2 3 X X X X X X X X 12 Group 2 Rows 27 to 47 1 2 3 X X n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.e. 12 1814-AA086-M0238, REV. 0 Page 76 of 415

Page 76 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 5, 6, 7, 8, 9, 10, 11, Case 68 8 12 Missing Group1 Rows 48 to 142 1 2 3 4 X X X X X X X X Group2 Rows 27to47 1 2 3 4 X n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a 4 X n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a 4 n.a n.a n.a. n.a X n.a n.a. X AVB 1, 2, 3, 4,5,6,7,8, Case 69 9 9Missing Group1 Rows 48 to 142 X X X X X X X X X 10 11 12 Group 2 Rows 27 to 47 X X X X X n.a n.a. X X 10 11 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 2, 3, 4, 5,6,7,8,9, Case 70 9 10 Missing Group1 Rows 48 to 142 1 X X X X X X X X X 11 12 Group 2 Rows 27 to 47 1 X X X X n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 3, 4, 5, 6,7,8,9, 10, 11 Case 71 9 Missing Group1 Rows 48 to 142 1 2 X X X X X X X X X 12 Group 2 Rows 27 to 47 1 2 X X X n.a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 4, 5, 6, 7,8,9,10, 11, 12 Case 72 9 Missing Group1 Rows 48 to142 1 2 3 X X X X X X X X X Group 2 Rows 27 to 47 1 2 3 X X n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. X 1814-AA086-M0238, REV. 0 Page 77 of 415

Page 77 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 1, 2, 3, 4,5,6,7, 8, 9,10 Case 73 10 Missing Group1 Rows 48 to 142 X X X X X X X X X X 11 12 Group 2 Rows 27 to 47 X X X X X n.a n.a. X X X 11 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 X n~a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 2, 3, 4, 5, 6, 7,8,9, 10, 11 Case 74 10 Missing Group1 Rows 48 to 142 1 X X X X X X X X X X 12 Group 2 Rows 27 to 47 1 X X X X n~a n.a. X X X X 12 Group 3 Rows 15 to 26 1 n.a n.a X X n~a n.a. X X n.a n.a. 12 Group 4 Rows 1 to 14 1 n.a n.a X n~a n.a n.a. n.a X n.a n.a. 12 AVB 3, 4, 5, 6,7,8,9, 10, 11, 12 Case 75 10 Missing Group I Rows 48 to 142 1 2 X X X X X X X X X X Group 2 Rows 27 to 47 1 2 X X X n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n.a n.a X n.a n.a n.a. n.a X n.a n.a. X AVB 1, 2, 3, 4,5,6,7,8, 9, 10, 11 Case 76 11 Missing Group1 Rows 48 to142 X X X X X X X X X X X 12 Group 2 Rows 27 to 47 X X X X X n.a n.a. X X X X 12 Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. X X n.a n.a. 12 Group 4 Rows 1to 14 X n.a n.a X n.a n.a n.a. n.a X n.a n.a. 12 AVB 2, 3, 4, 5,6,7,8,9, 10, 11, 12 Case 77 11 Missing Group1 Rows 48 to 142 1 X X X X X X X X X X X Group 2 Rows 27 to 47 1 X X X X n.a n.a. X X X X X Group 3 Rows 15 to 26 1 n.a n.a X X n.a n.a. X X n.a n.a. X Group 4 Rows 1 to 14 1 n~a n.a X n.a n.a n.a. n.a X n~a n.a. X 1814-AA086-M0238, REV. 0 Page 78 of 415

Page 78 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-1 (Continued)

Possible AVB Support Cases with Adjacent Missing AVBs AVB 1 ALL-Case 78 12 Missing Group 1 Rows 48 to 142 X X X X X X X X X X X X Group 2 Rows 27 to 47 X X X X X n.a n.a. X X X X X Group 3 Rows 15 to 26 X n.a n.a X X n.a n.a. X X n.a na. X Group 4 Rows 1 to 14 X n.a n.a X n.a n.a n.a. n.a X noa n.a. X 1814-AA086-M0238, REV. 0 Page 79 of 415

Page 79 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-1 Representative FASTVIB / FLOVIB Tube Model 1814-AA086-M0238, REV. 0 Page 80 of 415

Page 80 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Top Center Hot Leg Side Reference Drawing L5-04FU1 12 Figure 4-2 AVB Numbering 1814-AA086-M0238, REV. 0 Page 81 of 415

Page 81 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.2 Method Initially, linear dynamic analyses to characterize the response of the entire tube bundle to flow-induced excitation are performed using FASTVIB. These analyses identify limiting locations for various support conditions and show how the tubes of interest relate to the total bundle response as described in Section 4.3. FASTVIB incorporates the analytical approaches that were largely defined by the work of H.J. Connors at the Westinghouse Research Laboratories (now Science and Technology Center). Verification and qualification of this methodology for steam generator applications includes not only the analytical comparisons in configuration control files, but also many comparisons with results from tests and operating steam generators. These include comparisons with a 49-tube test model of the inlet region in water flow, a quarter-scale model of the U-bend tested in air, a .01 power scale Model F steam generator (MB-2), cantilever tube air flow tests, and operating Model 51 and Model F steam generators.

FASTVIB uses an assembly of structural elements and lumped masses with up to six degrees of freedom per node in a formulation adapted from FLOVIB, one of the earliest finite element programs applied to FIV analysis. Natural frequencies and mode shapes of the elastic structure are determined by conventional eigenvalue/modal decomposition techniques. Tube response to both flow turbulence and fluidelastic excitation is calculated consistent with the framework and empirical constants originally determined by H.J. Connors that has been applied for decades with confirmatory field experience. Fluid density and gap velocity distributions obtained from VGUB post-processing of ATHOS results are used along with structural properties of the tube and support configuration in these solutions. FASTVIB automates multiple solutions and stores limiting parameters in a format that is very useful for screening and subsequent evaluation (such as inputs to the wear evaluation described in Section 7.3). The entire set of ATHOSNGUB boundary conditions is accessed electronically to obtain boundary conditions for each column in each tube row being evaluated. Every tube column in up to 25 tube rows can be evaluated with significant parameter results stored and reported for any region of interest for each run. Total tube responses to the external flow excitation are obtained during evaluation of the SONGS RSGs, but only the response in the U-bend region of interest is retained to manage the size of output files.

a,c,e 1814-AA086-M0238, REV. 0 Page 82 of 415

Page 82 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 1814-AA086-M0238, REV. 0 Page 83 of 415

Page 83 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 4.2.1 FluidelasticExcitation Fluidelastic tube vibration is potentially more severe than the always present background flow turbulence because it is a self-excited mechanism. That is, relatively large tube amplitudes can feedback proportionally large driving forces if a tube excitation threshold is exceeded as a consequence of fluid-coupled damping or stiffness interaction with tube velocity or displacement.

This mechanism is the primary focus of this evaluation because no other flow-induced vibration mechanism is capable of producing the kind of response observed in the highly turbulent, two-phase flow U-bend region of the SONGS steam generators. Tube support spacing incorporated into the design of the tube support system typically provides tube response frequencies such that the tube excitation threshold is not exceeded for anticipated secondary fluid flow conditions. This approach provides margin against initiation of fluidelastic vibration for tubes that are effectively supported as designed for anticipated flow excitation levels.

However, clearances between the tubes and supporting structure introduce the potential that any given tube support location may not be totally effective in restraining tube motion. Initiation of fluidelastic tube response within available support clearances is possible if secondary flow conditions exceed the tube excitation threshold when no support or frictional constraint is assumed at a location with a gap around the tube as a consequence of the longer span initially afforded by the gap. This kind of gap-limited fluidelastic vibration is not as severe as the classical tube excitation response between spans that are too long for the existing flow field. This is the result of the constraint of the gap after the tube moves across the available gap when modulation occurs as fluidelastically induced tube/support interaction momentarily increases damping and higher modal frequencies in response to initiation of fluidelastic vibration within the gap. The temporary increase in damping and energy dissipation from the interaction then momentarily reduces or eliminates the fluidelastic component of vibration, which in turn reduces tube/support interaction and some higher frequency response, thereby decreasing damping again.

While the consequential tube/support interaction with intermittent impact/sliding conditions is not as severe as that for the classical fluidelastic tube excitation mechanism, it is much more severe than interaction induced by flow turbulence alone. This type of motion involves potential for significant tube wear and fatigue damage and is the mechanism treated by methodology described in Section 7.1 with resulting tube/AVB wear described in Section 7.3.

1814-AA086-M0238, REV. 0 Page 84 of 415

Page 84 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 1814-AA086-M0238, REV. 0 Page 85 of 415

Page 85 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Ia,c,e 4.2.1.1 Tube Excitation Constantfor StraightLeg Region I

Ia,c,e 4.2.1.2 Tube Excitation Constantfor U-bend Region

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Ia,c,e Ia,c,e 1814-AA086-M0238, REV. 0 Page 86 of 415

Page 86 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 4.2.2 Flow Turbulence I

Ia,c,e I

1814-AA086-M0238, REV. 0 Page 87 of 415

Page 87 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a.c,e 4.2.3 Damping in the StraightLeg Region

[

Ia,ce 4.2.4 Damping in the U-bend Region

[

aBc~e 1814-AA086-M0238, REV. 0 Page 88 of 415

Page 88 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 4.2.5 Flow-Induced Vibration Relevant Input Parameters 4.2.5.1 Damping Values for FIV Evaluation

[

]a,c,e I

1814-AA086-M0238, REV. 0 Page 89 of 415

Page 89 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 1814-AA086-M0238, REV. 0 Page 90 of 415

Page 90 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e a,c,e 1814-AA086-M0238, REV. 0 Page 91 of 415

Page 91 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.2.5.2 FluidelasticTube Excitation Constant,

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Ia,c,e 1814-AA086-M0238, REV. 0 Page 92 of 415

Page 92 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 4.2.5.3 Other Relevant Constants and Parameters I

Ia,c,e I

1814-AA086-M0238, REV. 0 Page 93 of 415

Page 93 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e All of the other FIV relevant input parameters as they pertain to the tube material and dimensions are also listed in Table 4-2 with their appropriate reference(s) noted.

1814-AA086-M0238, REV. 0 Page 94 of 415

Page 94 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-2 FIV Relevant Input Parameters Parameter Value Reference (s)

Young's Modulus, psi 28.0x10 6 to 28.1x10 6 ASME Code Poisson's Ratio 0.32 ASME Code Tube Metal Density, lb/in 3 0.2905 Reference 4-7 Tube Axial Area, in2 0.09551 Table 4-3 Tube Shear Area, in2 0.04775 0.5*Axial area Tube Flexural Inertia, in4 0.005989 Table 4-3 Tube Torsional Inertia, in4r' 0.011979 c,e Table 4-3 Strouhal Number, St Section 4.2.5.3 Inside Diameter of Tube, in Table 4-3 Outside Diameter of Tube, in Table 4-3 Lift Coefficient, CL Section 4.2.5.3 Axial Flow Turbulence Amplitude Constant, ClA Section 4.2.5.3 Cross Flow Turbulence Amplitude Constant, C, Section 4.2.5.3 Correlation Parameter Section 4.2.5.3 Cross Flow Turbulence Velocity Power Constant, c Section 4.2.5.3 Axial Flow Turbulence Velocity Power Constant, S, Section 4.2.5.3 Damping Expression (Pinned Reference) Section 4.2.5.1 Two-phase Damping (minimum o) Section 4.2.5.1 Two-phase Damping (maximum S) Section 4.2.5.1 Threshold Tube Excitation Constant, Beta Section 4.2.5.2 Added Mass Coefficient, Cm Section 4.2.1 1814-AA086-M0238, REV. 0 Page 95 of 415

Page 95 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-3 Straight Leg Tube Damping in Liquid 1814-AA086-M0238, REV. 0 Page 96 of 415

Page 96 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-4 Strouhal Numbers for Normal Triangular Arrays 1814-AA086-M0238, REV. 0 Page 97 of 415

Page 97 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.2.6 Flow-Induced Vibration Model The flow-induced vibration (FIV) model for each individual tube is generated from the SONGS Units 2 and 3 RSGs' geometry information in Reference 4-15 and the ATHOS model information in Reference 4-7. Figure 4-1 depicts the FIV model for a representative tube case. The boundary conditions in the model include the tubesheet, the seven tube support plates (TSPs) above the tubesheet on both the hot and cold leg sides, and the twelve anti-vibration bars (AVBs), where applicable, in the U-bend region. The tubesheet provides a fixed condition for the FIV model on the hot and cold leg sides of the tube. The TSPs limit the in-plane (X-direction) and out-of-plane (Y-direction) displacements in the vertical legs of the tube bundle. In the U-bend region, the AVBs provide restraint in the out-of-plane (Y-direction) displacement.

Table 4-3 contains the tube section properties for the tubes in the SONGS RSG. Table 4-4 depicts the straight leg lengths of the model for a representation of the tube rows of interest.

This table also includes the radius of the U-bend for each of these tube rows. Table 4-5 contains the vertical distances for the TSPs along with the respective node distances for the individual straight leg nodes used in the ATHOS model. The vertical distances for Nodes 42, 43, 73, and 74 vary, depending on the tube row of interest. Table 4-6 shows the angle locations of the respective AVBs for a representation of the tube rows considered in the analysis.

1814-AA086-M0238, REV. 0 Page 98 of 415

Page 98 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-3 Tube Section Properties Tube OD, Outer Diameter, mm (in.) 19.05 0.75 ID, Inner Diameter, mm (in.) 16.87 0.664 Tube Wall Thickness, mm (in.) 1.09 0.043 Axial Area, cmA2 (inA2) 0.6162 0.09551 Moment of Inertia cmA4 (inA4) 0.2493 0.005989 Torsional Moment of Inertia, cmA4 (inA4) 0.4986 0.011979 Tube Pitch, mm (in.), Triangular 25.4 1.00 Tube Material Alloy 690 Table 4-4 Straight Leg and Tube U-bend Radius Dimensions Row No Dist. "A" Straight Radius-Leg - In Inch I 336.610 308.420. 5.770.

14 336.610 308.420 12.270 40 336.610 .. 308.420 25.270 74 336.660 308.467 42.270 80 336.800 308.609 45.270 100 337.280 309.081 55.270 120' 338.220 310.025 65.270 135 339.230 311.036 72.770 141 339.680 311.485 75.770 142 339.760 311.560 76.270 1814-AA086-M0238, REV. 0 Page 99 of 415

Page 99 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-5 TSP and Straight Leg Node Dimensions Plate Distances SONGS RSG Plate Plate Dist From Delta Letter TTS Distance

- TTS 0.000 A TsP 1 42.815 42.815 B TSP 2 86.476 43.661 C TSP 3 130.140 43.664 D TSP 4 173.800 43.660 E TSP 5 217.460 43.660 F TSP 6 261.120 43.660 G TSP 7 304.780 43.660 Node Coordinate System In FLOVIB:

Plate Coord Hot Leg Cold Leg Delta TTS 0.000 1 115 3.750 2.. 114. 3.75 7.500 3 113 3.75 11.250 4 112 3.75 15.000 5 111 3.75 21.954 6 110 6.95 28.907 7 109 6.95 35.861 8 108 6.95 TSP 1 42.815 9 107 6.95 50.092 10 106 7.28 57.369 11 105 7.28 64.646 12 104 7.28 71.923 13 103 7.28 79.199 14 102 7.28 TSP 2 86.476 15 101 7.28 95.209 16 100 8.73 103.940 17 99 8.73 112.670 18 98 8.73 121.410 19 97 8.74 TSP 3 130.140 20 96 8.73 138.870 21 95 8.73 147.600 22 94 8.73 156.340 23 93 8.741 165.070 24 92 8.73 TSP 4 173.800 25 91 8.73 182.530 26 90 8.73 191.260 27 89 8.73 200.000 28 88 8.74 208.730 29 87 8.73 TSP 5 217.460 30 86 8.73 226.190 31 85 8.73 234.930 32 84 8.74 243.660 33 83 8.73 252.390 34 82 8.73 TSP 6 261.120 35 81 8.73 268.400 36 80 7.28 275.670 37 79 7.27 282.950 38 78 7.28 290.230 39 77 7.28 297.510 40 76 7.28 TSP 7 304.780 41 75 7.27 306.600 42 74 1.82 308.420 43 73 1.82 1814-AA086-M0238, REV. 0 Page 100 of 415

Page 100 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-6 AVB Support Locations Row Angular Location of AVBs- Degrees 1 33.70 . 146.30 14 170852.45 . 127.55 162.92 40 14.39 22.43* 45.47 54.04 75.00: 105.00 125.96 134.53 157.57 165.61 74 1i3.30 24.45* 43.14 54.61' 71.48ý 84.72 95.28 108.52 125.39 136.86 155.55 166.70 80 13.03,24.50:42.78 54.57 71.07* 84.45 95.55 108.93 125.43 137.22 155.50 166.97 100 12.3324.62 41.86.54.47 70.02ý 83.78 96.22 109.98 125.53 138.14 155.38 167.67 120 11.45 24.35 40.91 54.17 69.12 83.25 96.75 110.88 125.83 139.09 155.65 168.55 135 10*71 23.98 40.18 53.8668.52 82.91 - 97.09 -111i8 '126.A14 139.82156.02 169.29 141 10.42 23.82 39.91 53.73 68.30 82.79 97.21 111.70 126.27 140.09 156.18 169.58 142 10.37 23.79: 39.86 53.71 68.26 82.77 97.23 111.74 126.29 140.14 156.21 169.63 1814-AA086-M0238, REV. 0 Page 101 of 415

Page 101 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.3 Typical Results Maps showing calculated tube excitation ratios were generated for the missing AVB cases that correspond to the cases found for the most limiting tubes with wear. The cases chosen were Cases 17, 28, 37, 38, 45, 46, 53, 54, and 60. Table 4-1 contains the description of the cases with respect to AVB support.

4.3.1 Out-of-Plane Results The tube excitation maps were plotted for the out-of-plane direction for the 100% and 70%

power conditions in Figures 4-5 through Figure 4-22. Table 4-7 summarizes the FASTVIB plots for the out-of-plane direction available in this section.

4.3.2 In-Plane Results The stability maps were plotted for the in-plane-plane direction for the 100% and 70% power conditions in Figures 4-23 through Figure 4-40. Table 4-7 summarizes the FASTVIB plots for the inplane direction available in this section. Note that there were many other cases considered in the FASTVIB analysis; however, the magnitude of the output precluded the inclusion of all the results in this report.

Table 4-7 FASTVIB Tube Excitation Plots Case Number of Power Figure Number for FiueNmrfo No. Missing Level Out-of-Plane In-Plane AVBs 17 2 100% 4-5 4-23 28 3 100% 4-6 4-24 37 4 100% 4-7 4-25 38 4 100% 4-8 4-26 45 5 100% 4-9 4-27 46 5 100% 4-10 4-28 53 6 100% 4-11 4-29 54 6 100% 4-12 4-30 60 7 100% 4-13 4-31 17 2 70% 4-14 4-32 28 3 70% 4-15 4-33 37 4 70% 4-16 4-34 38 4 70% 4-17 4-35 45 5 70% 4-18 4-36 46 5 70% 4-19 4-37 53 6 70% 4-20 4-38 54 6 70% 4-21 4-39 60 7 70% 4-22 4-40 Table 4-1 contains a description of the FASTVIB cases listed above.

1814-AA086-M0238, REV. 0 Page 102 of 415

Page 102 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-5 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 2 AVBs Missing (Case 17) 1814-AA086-M0238, REV. 0 Page 103 of 415

Page 103 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-6 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 3 AVBs Missing (Case 28) 1814-AA086-M0238, REV. 0 Page 104 of 415

Page 104 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-7 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 4 AVBs Missing (Case 37) 1814-AA086-M0238, REV. 0 Page 105 of 415

Page 105 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-8 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 4 AVBs Missing (Case 38) 1814-AA086-M0238, REV. 0 Page 106 of 415

Page 106 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-9 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 5 AVBs Missing (Case 45) 1814-AA086-M0238, REV. 0 Page 107 of 415

Page 107 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-10 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 5 AVBs Missing (Case 46) 1814-AA086-M0238, REV. 0 Page 108 of 415

Page 108 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-11 Out-of-Plane Tube Excitation Ratio Map - 100% Power- 6 AVBs Missing (Case 53) 1814-AA086-M0238, REV. 0 Page 109 of 415

Page 109 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-12 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 6 AVBs Missing (Case 54) 1814-AA086-M0238, REV. 0 Page 110 of 415

Page 110 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-13 Out-of-Plane Tube Excitation Ratio Map - 100% Power - 7 AVBs Missing (Case 60) 1814-AA086-M0238, REV. 0 Page 111 of 415

Page 111 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-14 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 2 AVBs Missing (Case 17) 1814-AA086-M0238, REV. 0 Page 112 of 415

Page 112 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-15 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 3 AVBs Missing (Case 28) 1814-AA086-M0238, REV. 0 Page 113 of 415

Page 113 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-16 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 4 AVBs Missing (Case 37) 1814-AA086-M0238, REV. 0 Page 114 of 415

Page 114 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-17 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 4 AVBs Missing (Case 38) 1814-AA086-M0238, REV. 0 Page 115 of 415

Page 115 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-18 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 5 AVBs Missing (Case 45) 1814-AA086-M0238, REV. 0 Page 116 of 415

Page 116 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 7

Figure 4-19 Out-of-Plane Tube Excitation Ratio Map - 70% Power - 5 AVBs Missing (Case 46) 1814-AA086-M0238, REV. 0 Page 117 of 415

Page 117 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-20 Out-of-Plane Tube Excitation Ratio Map - 70% Power - Columns 1 through 89 - 6 AVBs Missing (Case 53) 1814-AA086-M0238, REV. 0 Page 118 of 415

Page 118 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-21 Out-of-Plane Tube Excitation Ratio Map - 70% Power - Columns I through 89 - 6 AVBs Missing (Case 54) 1814-AA086-M0238, REV. 0 Page 119 of 415

Page 119 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-22 Out-of-Plane Tube Excitation Ratio Map - 70% Power - Columns 1 through 89 - 7 AVBs Missing (Case 60) 1814-AA086-M0238, REV. 0 Page 120 of 415

Page 120 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-23 In-Plane Stability Ratio Map - 100% Power - 2 AVBs Missing (Case 17) 1814-AA086-M0238, REV. 0 Page 121 of 415

Page 121 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-24 In-Plane Stability Ratio Map - 100% Power - 3 AVBs Missing (Case 28) 1814-AA086-M0238, REV. 0 Page 122 of 415

Page 122 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-25 In-Plane Stability Ratio Map - 100% Power - 4 AVBs Missing (Case 37) 1814-AA086-M0238, REV. 0 Page 123 of 415

Page 123 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-26 In-Plane Stability Ratio Map - 100% Power- 4 AVBs Missing (Case 38) 1814-AA086-M0238, REV. 0 Page 124 of 415

Page 124 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-27 In-Plane Stability Ratio Map - 100% Power - 5 AVBs Missing (Case 45) 1814-AA086-M0238, REV. 0 Page 125 of 415

Page 125 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-28 In-Plane Stability Ratio Map - 100% Power - 5 AVBs Missing (Case 46) 1814-AA086-M0238, REV. 0 Page 126 of 415

Page 126 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-29 In-Plane Stability Ratio Map - 100% Power - 6 AVBs Missing (Case 53) 1814-AA086-M0238, REV. 0 Page 127 of 415

Page 127 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-30 In-Plane Stability Ratio Map - 100% Power - 6 AVBs Missing (Case 54) 1814-AA086-M0238, REV. 0 Page 128 of 415

Page 128 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-31 In-Plane Stability Ratio Map - 100% Power - 7 AVBs Missing (Case 60) 1814-AA086-M0238, REV. 0 Page 129 of 415

Page 129 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-32 In-Plane Stability Ratio Map - 70% Power - 2 AVBs Missing (Case 17) 1814-AA086-M0238, REV. 0 Page 130 of 415

Page 130 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-33 In-Plane Stability Ratio Map - 70% Power - 3 AVBs Missing (Case 28) 1814-AA086-M0238, REV. 0 Page 131 of 415

Page 131 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e 7

Figure 4-34 In-Plane Stability Ratio Map - 70% Power - 4 AVBs Missing (Case 37) 1814-AA086-M0238, REV. 0 Page 132 of 415

Page 132 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-35 In-Plane Stability Ratio Map - 70% Power - 4 AVBs Missing (Case 38) 1814-AA086-M0238, REV. 0 Page 133 of 415

Page 133 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-36 In-Plane Stability Ratio Map - 70% Power - 5 AVBs Missing (Case 45) 1814-AA086-M0238, REV. 0 Page 134 of 415

Page 134 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-37 In-Plane Stability Ratio Map - 70% Power - 5 AVBs Missing (Case 46) 1814-AA086-M0238, REV. 0 Page 135 of 415

Page 135 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-38 In-Plane Stability Ratio Map - 70% Power - 6 AVBs Missing (Case 53) 1814-AA086-M0238, REV. 0 Page 136 of 415

Page 136 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-39 In-Plane Stability Ratio Map - 70% Power - 6 AVBs Missing (Case 54) 1814-AA086-M0238, REV. 0 Page 137 of 415

Page 137 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-40 In-Plane Stability Ratio Map - 70% Power - 7 AVBs Missing (Case 60) 1814-AA086-M0238, REV. 0 Page 138 of 415

Page 138 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.3.3 Typical Mode Shapes 4.3.3.1 All A VB Supports Effective In Task 1 (Reference 4-1), the FIV analysis addressed the condition where all of the supports are effective (pinned) in both the U-bend and in the straight leg, i.e., Case 0. For the out-of-plane responses, a large number of the tubes have tube excitation ratio values of 0.00 in the U-bend region, but can range up to 0.39 for the higher tube row numbers. Figures 4-41 through 4-43 depict the out-of-plane mode shapes for representative tube locations R120 C80, R135 C85, and R141 C81, respectively. Note that the frequencies considered in Case 0 analyses ranged up to 300 Hz. With respect to the in-plane responses in the U-bend region for Case 0, no in-plane responses occur in this region for frequencies up to 200 Hz.

4.3.3.2 Missing A VB Supports In Task 2, the FIV analysis addressed the conditions where one AVB support is ineffective. The FIV analysis also evaluated two continuous ineffective AVBs and progressed in continuous increments of two ineffective AVBs until in-plane fluidelastic instability is encountered. Both out-of-plane and in-plane responses are considered.

For the out-of-plane responses, all of the tubes are stable for one AVB support missing.

Figures 4-44 and 4-45 depict the out-of-plane mode shapes for the representative tube location R120 C80 for Cases 3 and 4 where AVBs 3 and 4, respectively, are missing. Figure 4-46 contains an out-of-plane mode shape for tube location R135 C85 for Case 5 with AVB 5 missing.

When two AVB supports are missing, tube excitation for out-of-plane responses begins at tubes above Row 122. Figures 4-47 and 4-48 show the out-of-plane mode shapes for tube locations R120C80 and R141C81 for Case 13 with AVBs 1 and 2 missing. Figure 4-49 depicts the out-of-plane mode shape for R135C85 for Case 14 with AVBs 2 and 3 missing. Similarly, Figure 4-50 shows the out-of-plane mode shape for R141C81 for Case 15 with AVBs 3 and 4 missing.

With more than two AVB supports missing, tube excitation for out-of-plane responses occurs for tubes above Row 80 with four AVBs missing, tubes above Row 49 with six AVBs missing, and tubes above Row 40 with eight AVBs missing. Figure 4-51 depicts the out-of-plane mode shape for R120C80 for Case 34 with AVBs 1 through 4 missing. Figure 4-52 shows the out-of-plane mode shape for R120 C80 for Case 51 with AVBs 1 through 6 missing. Similarly, Figure 4-53 contains the out-of-plane mode shape for R120 C80 for Case 64 with AVBs 1 through 8 missing.

For the in-plane responses, all of the tubes are stable for one or two AVB supports missing.

Only when more than two AVBs are missing does instability start to occur. Instability is present in tubes above Row 110 with four AVBs missing, tubes above Row 105 with six AVBs missing, and tubes above Row 74 with eight AVBs missing. Figure 4-54 depicts the in-plane mode shape for R120 C80 for Case 34 with AVBs 1 through 4 missing. Figure 4-55 shows the in-plane mode shape for R120 C80 for Case 51 with AVBs 1 through 6 missing. Similarly, Figure 4-56 contains the in-plane mode shape for R120 C80 for Case 64 with AVBs 1 through 8 missing.

1814-AA086-M0238, REV. 0 Page 139 of 415

Page 139 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-41 Out-of-Plane Mode Shape Plot for R120 C80 - No AVBs Ineffective (Case 0) 1814-AA086-M0238, REV. 0 Page 140 of 415

Page 140 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-42 Out-of-Plane Mode Shape Plot for R135 C85 - No AVBs Ineffective (Case 0) 1814-AA086-M0238, REV. 0 Page 141 of 415

Page 141 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-43 Out-of-Plane Mode Shape Plot for R141 C81 - No AVBs Ineffective (Case 0) 1814-AA086-M0238, REV. 0 Page 142 of 415

Page 142 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-44 Out-of-Plane Mode Shape Plot for R120 C80 - 1 AVB Ineffective (Case 3) 1814-AA086-M0238, REV. 0 Page 143 of 415

Page 143 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-45 Out-of-Plane Mode Shape Plot for R120 C80 - 1 AVB Ineffective (Case 4) 1814-AA086-M0238, REV. 0 Page 144 of 415

Page 144 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-46 Out-of-Plane Mode Shape Plot for R135 C85 - 1 AVB Ineffective (Case 5) 1814-AA086-M0238, REV. 0 Page 145 of 415

Page 145 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-47 Out-of-Plane Mode Shape Plot for R120 C80 - 2 AVBs Ineffective (Case 13) 1814-AA086-M0238, REV. 0 Page 146 of 415

Page 146 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-48 Out-of-Plane Mode Shape Plot for R141 C81 - 2 AVBs Ineffective (Case 13) 1814-AA086-M0238, REV. 0 Page 147 of 415

Page 147 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-49 Out-of-Plane Mode Shape Plot for R135 C85 - 2 AVBs Ineffective (Case 14) 1814-AA086-M0238, REV. 0 Page 148 of 415

Page 148 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-50 Out-of-Plane Mode Shape Plot for R141 C81 -2 AVBs Ineffective (Case 15) 1814-AA086-M0238, REV. 0 Page 149 of 415

Page 149 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-51 Out-of-Plane Mode Shape Plot for R120 C80 - 4 AVBs Ineffective (Case 34) 1814-AA086-M0238, REV. 0 Page 150 of 415

Page 150 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-52 Out-of-Plane Mode Shape Plot for R120 C80 - 6 AVBs Ineffective (Case 51) 1814-AA086-M0238, REV. 0 Page 151 of 415

Page 151 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-53 Out-of-Plane Mode Shape Plot for R120 C80 - 8 AVBs Ineffective (Case 64) 1814-AA086-M0238, REV. 0 Page 152 of 415

Page 152 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-54 In-Plane Mode Shape Plot for R120 C80 - 4 AVBs Ineffective (Case 34) 1814-AA086-M0238, REV. 0 Page 153 of 415

Page 153 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-55 In-Plane Mode Shape Plot for R120 C80 - 6 AVBs Ineffective (Case 51) 1814-AA086-M0238, REV. 0 Page 154 of 415

Page 154 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-56 In-Plane Mode Shape Plot for R120 C80 - 8 AVBs Ineffective (Case 64) 1814-AA086-M0238, REV. 0 Page 155 of 415

Page 155 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.4 Additional Considerations 4.4.1 SG 2E088 versus SG 2E089 and Low versus High Column Review of the available operating data indicates that SG 2E088 and SG 2E089 operate at close but slightly different thermal-hydraulic conditions. At the start of this analysis it was not clear if this was a significant effect or not, therefore a study was performed to determine if these small changes in operating conditions are meaningful. The study was performed by running ATHOS and FASTVIB for each SG and comparing results obtained for SG 2E088 and SG 2E089. If the results were significantly different, then it would be necessary to address each SG separately.

Note that this was not an anticipated outcome, but the following study clearly made a determination that totally separate analysis for SG 2E088 and SG 2E089 was not necessary.

The initial ATHOS runs were for SG 2E089. To determine if additional ATHOS and FASTVIB runs for the 2E088 steam generator were needed, the 70% power level was run for SG 2E088 and compared to the SG 2E089 results. The goal of the comparison was to show that the results between the two steam generators were similar enough such that the ATHOS and FASTVIB evaluations did not need to be performed for every power level for each steam generator. In addition, it was noted that tube plugging in the steam generators was not symmetrical about the center column of the tube bundle. Both ATHOS and FASTVIB assume symmetry about the center column as the SG is typically symmetric about this plane. Therefore two separate evaluations were needed, one for each side of the steam generator (low column and high column). Although the intention was to evaluate both the low and high column tubes for SG 2E089, a comparison was also made between the low and high column tubes to determine the amount of difference associated with non-symmetrical tube plugging.

Three limiting tubes were selected for a direct comparison with their respective FASTVIB missing AVB cases. These tubes were R119 C89, which is the limiting active tube in SG 2E089, R1 33 C91, which is the limiting plugged tube without a stabilizer in SG 2E088, and Ri 11 C81, which is the limiting stabilized tube in SG 2E089. Note that the stabilizer case was assumed to be the stabilizer surrounded by secondary water scenario. These cases were run with the 70% power level ATHOS data for SGs 2E088 and 2E089 with both the low and high column data.

The tube excitation ratios for the three limiting tubes are shown in Table 4-8 for the out-of-plane direction and in Table 4-9 for the in-plane direction. These tables provide comparisons of tube excitation ratios for low column versus high column results for both SG 2E088 and SG 2E089.

With these tables it is possible to make comparisons between the two SGs and also between the high and low columns for both the in-plane and out-of-plane directions. The tube excitation maps for Case 46 with active tubes are plotted in Figure 4-57 through Figure 4-64 for comparative purposes for all of the tubes considered. Note that there are only very slight differences between each of the indicated cases.

In conclusion, Table 4-8 and Table 4-9 show that the tube excitation ratios are essentially the same with small changes in the hundredths place. This difference is insignificant for the purposes of this evaluation. The tube excitation ratio maps in Figure 4-57 through Figure 4-64 also show the same trend with the differences in stability ratio being small occurring in the hundredths place. The trend shown in Table 4-8, Table 4-9 and by comparing Figure 4-57 through Figure 4-64, is typical of all of the cases run for SG 2E089 compared to the SG 2E088 results as well as the low column versus high column results.

1814-AA086-M0238, REV. 0 Page 156 of 415

Page 156 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 It can be concluded that the differences in the steam generators resulting from the differences in plugging and operating conditions is insignificant. Therefore, it is not necessary to run separate cases for the 2E088 steam generator as well as for both the low and high column tubes.

However, the ATHOS VGUB files have been generated and are available for the low and high columns for all power levels considered in SG 2E089. For the purposes of the evaluation, the low and high column tubes will be treated separately since the ATHOS data is available.

1814-AA086-M0238, REV. 0 Page 157 of 415

Page 157 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-8 Tube Excitation Ratio Comparison SG 2E088 vs. 2E089 Low and High Tube Columns Out-of-Plane Out-of-Plane Tube Out-of-Plane Tube Tube SG Tube Max FASTVIB Sec Excitation Ratio Excitation Ratio Tube/AVB SG 2E088 SG 2E089 Wear Low High Low High R/C No Description Found Case Mass Columns Columns Columns Columns a,c,e Limiting Active Tube R119C89 89 in SG 89 28% 46 Primary R133C91 88 Limiting Plugged 35% 18 Air Tube in SG 88 (1 of 2)

R111C81 89 Tube with Tube to 18% 38 Stabilizer Tube Wear (2 of 2)

Table 4-9 Tube Excitation Ratio Comparison SG 2E088 vs. 2E089 Low and High Tube Columns In-Plane Tube SG Tube Max In-Plane Excitation In-Plane Excitation Tube/AVB Ratio SG 2E088 Ratio SG 2E089 R/C No Description Wear Low High Low High Found Case Mass Columns Columns Columns Columns a,c,e R119C89 89 Limiting Active 28% 46 Primary Tube in SG 2E089 Limiting Plugged R133C91 88 Tube in SG 2E088 35% 18 Air (1 of 2)

R111C81 89 Tube with Tube-to- 18% 38 Stabilizer Tube Wear (2 of 2) 1814-AA086-M0238, REV. 0 Page 158 of 415

Page 158 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-57 Case 46 Primary Water Density Tube Excitation Ratio Map for SG 2E088 Low Column Out-of-Plane 1814-AA086-M0238, REV. 0 Page 159 of 415

Page 159 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-58 Case 46 Primary Water Density Tube Excitation Ratio Map for SG 2E088 High Column Out-of-Plane 1814-AA086-M0238, REV. 0 Page 160 of 415

Page 160 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-59 Case 46 Primary Water Density Tube Excitation Ratio Map for SG 2E089 Low Column Out-of-Plane 1814-AA086-M0238, REV. 0 Page 161 of 415

Page 161 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ac,e Figure 4-60 Case 46 Primary Water Density Tube Excitation Ratio Map for SG 2E089 High Column Out-of-Plane 1814-AA086-M0238, REV. 0 Page 162 of 415

Page 162 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-61 Case 46 Primary Water Density Stability Map for SG 2E088 Low Column In-Plane 1814-AA086-M0238, REV. 0 Page 163 of 415-

Page 163 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-62 Case 46 Primary Water Density Stability Map for SG 2E088 High Column In-Plane 1814-AA086-M0238, REV. 0 Page 164 of 415

Page 164 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-63 Case 46 Primary Water Density Stability Map for SG 2E089 Low Column In-Plane 1814-AA086-M0238, REV. 0 Page 165 of 415

Page 165 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e L

Figure 4-64 Case 46 Primary Water Density Stability Map for SG 2E089 High Column In-Plane 1814-AA086-M0238, REV. 0 Page 166 of 415

Page 166 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.4.2 Effects of Different Mass on Tube Response A comparison was performed for tubes that have been plugged to determine the impact of various materials that could be inside the tube on the FIV evaluation. Several conditions can exist inside a plugged tube. The tube can have air inside of it, if it is leak tight, or it can have water in it if the tube has leaked. The tube plugs generally do not leak, so the water inside of the tube would be considered to come from the secondary side due to a compromised tube wall.

The tube can also have a cable stabilizer installed inside of it to provide support for a damaged tube. The stabilizer may be surrounded by air or water depending on the condition of the individual tube.

For the purposes of this comparison, the damping correlation used when a stabilizer is installed in the tube is assumed to be the same as a tube without a stabilizer. The damping correlation is dependent on the natural frequency of the mode shape and will change with frequency; however, the constants in the correlation are assumed to be the same. The stabilizers add a significant amount of mass to the tube which will impact the FIV evaluation and the tube excitation ratio of the tube. The FASTVIB comparison will focus on the effects of this additional mass by addressing the revised effective density of the tube.

FASTVIB Cases 38 and 55 were chosen to be a representative set to be used in the comparison of the plugged tube inside conditions. Three tubes were chosen for the comparison, R100 C88, R120 C88 and R130 C88. These tubes were chosen because they represent a range in tube rows where the majority of the wear conditions exist. In addition, the centermost column was chosen since the highest tube excitation ratios generally occur near the center column.

a,c,e The tube excitation ratios for the four plugged tube cases are compared against the tube excitation ratios for an active tube that has primary water inside of the tube. These values are tabulated in Table 4-11. Plots of tube excitation ratio versus power level for the various tube cases are plotted for the Row 130 Column 88 tube in Figure 4-65 through Figure 4-68. For a plugged tube without a stabilizer installed, the tube excitation ratio increases slightly compared 1814-AA086-M0238, REV. 0 Page 167 of 415

Page 167 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 to the tube excitation ratio for when the tube is active. It can also be seen that the added mass of the stabilizer slightly reduces the tube excitation ratio compared to an active tube. This effect is the largest for the 100% power case and, as the power level decreases, all of the cases tend to converge.

There are several competing terms in the calculation of the tube excitation ratio equations that contribute to the change in the tube excitation ratio with the addition of a stabilizer. These terms are the natural frequency, virtual mass, and the damping. [

]a.c.e It has been found that for small changes in tube mass, the tube excitation ratio will increase because the natural frequency tends to control the change in tube excitation ratio. However, for a significant increase in mass, the increased damping and virtual mass increase more rapidly than the decrease in the natural frequency causing a net decrease in the tube excitation ratio.

In Reference 4-16, it is found that the AREVA cable stabilizers do not extend through the full length of the tube, from tubesheet to tubesheet. The stabilizer is only long enough to extend the length of one straight leg and completely through the U-bend region of the tube. FASTVIB is not currently able to address multiple density inputs for different parts of the tube so the stabilizer either needs to be assumed to run the full length of the tube or be neglected in the analysis. It is determined that the primary water density for the active tube case is conservative for tubes with stabilizers and that active tube results can be applied to plugged tubes with stabilizers. The tubes of interest for the wear evaluation all contain cable stabilizers and therefore only one set of cases with primary water density need to be run for this evaluation.

4.4.3 Stabilization Using Two Cables A method for stabilizing tubes in the SONGS steam generators is to install two shorter cable stabilizers instead of installing one long cable stabilizer. One stabilizer will be inserted into the hot leg of the tube and a second stabilizer will be inserted into the cold leg. The cable stabilizers in each leg will extend approximately 60 degrees into the U-bend region of the tube on each side leaving the top center 60 degrees of the U-bend unstabilized. A schematic of this stabilization method is shown in Figure 4-69. The purpose of installing stabilizers in this fashion is that this configuration is expected to add additional damping to the tube and thus further reduce the excitation ratio of the tube. It is expected that an additional [ ]b damping is achieved from this configuration. This section quantifies the benefits of the additional damping.

1814-AA086-M0238, REV. 0 Page 168 of 415

Page 168 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 From Section 4.2.4, a generic two-phase damping model that was developed for the design and evaluation of the U-bend region was developed that has the form:

a,c,e Section 4.4.2 of this report shows that the difference in the added mass of the stabilizer does not greatly change the stability ratio. This comparison only accounted for the changes associated with the added mass and no change to the damping correlation was made. It is also true that the addition of mass from the two stabilizers that only extend into part of the U-bend region will also have a small impact on the overall excitation ratio of the tube. However, the change in damping will have a significant impact on the excitation ratio since it directly factors into the calculation of the critical velocity term in the excitation ratio. The decrease in excitation ratio is proportional to the square root of the difference in damping.

a,c,e In conclusion, the general effect of the two cable stabilizer configuration shown in Figure 4-69 will reduce the excitation/stability ratio by approximately 7% mainly due to the additional [ b damping introduced by the cable stabilizer configuration.

1814-AA086-M0238, REV. 0 Page 169 of 415

Page 169 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-10 Stabilizer Effective Density Calculation Tod 0.75 in Tube Outer Diameter Tw 0.0429 in Tube Wall Thickness Pw 45.523 lb/ftA3 Water Density @ 550°F Pw 0.026 lb/inA3 Water Density @ 5501F Ms 0.46 lb/ft Stabilizer weight per length Ps 0.286 lb/inA3 Stainless Steel Density Ditube 0.6642 in Tube Inner Diameter Ai 0.3465 inA2 Tube Inside Area As 0.1340 inA2 Stabilizer Area Stabilizer With Water a,c,e Peff Water lb/inA3 Stabilizer Effective Density with Water Surrounding Peff Water lb/ftA3 Stabilizer Effective Density with Water Surrounding Stabilizer With Air a,c,e Peff Air lb/inA3 Stabilizer Effective Density with Air Surrounding PeffAir Ib/ftA3 Stabilizer Effective Density with Air Surrounding 1814-AA086-M0238, REV. 0 Page 170 of 415

Page 170 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-11 Tube Excitation Ratios for Tube Inside Density Cases at Power Level Out-of-Plane In-Plane Primary Water Density Primary Water Density 70% 60% Case 38 100% 80% 70% 60%

Case 38 100% 80%

Power Power Power Power.., Power Power Power Power c,e R100C88 I R100C88 F R120C88 R120C88 R130C88 R130C88 Case 55 100% 80% 70% 60%a,_, Case 55 100% 80% 70% 60%

R100C88 R100C88 R120C88 R120C88 R130C88 R130C88 Secondary Water Density Secondary Water Density 60 Case 38 100% 80% 70% %a,c, Case 38 100% 80% 70% 60% a ,e R100C88 R100C88 J R120C88 R120C88 R130C88 R130C88 Case 55 100% 80% 70% 60% Case 55 100% 80% 70% 60% a,-,e R100C88 R100C88 R120C88 R120C88 R130C88 R130C88 Stabilizer and Water Stabilizer and Water Case 38 100% 80% 70% 60%. Case 38 100% 80% 70% 60% , e R100C88 R100C88 R120C88 R120C88 R130C88 R130C88 Case 55 100% 80% 70% 60%a * - Case 55 100% 80% 70% 60% a,(,e R100C88 7 R100C88 R120C88 R120C88 R130C88 R130C88 7i 1814-AA086-M0238, REV. 0 Page 171 of 415

Page 171 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-11 (Continued)

Tube Excitation Ratios for Tube Inside Density Cases at Power Level Stabilizer and Air Stabilizer and Air Case 38 100% 80% 70% 60%a,c, Case 38 100% 80% 70% 60% a, e R100C88 R100C88 R120C88 R120C88 R130C88 R130C88 Case 55 100% 80% 70% 60%a,., Case 55 100% 80% 70% 60%

R100C88 R100C88 _a___e R120C88 R120C88 R130C88 R130C88 Air Only Air Only 6

Case 38 100% 80% 70% 0%a,c, Case 38 100% 80% 70% 60% a,,e R100C88 R100C88 R120C88 R120C88 R130C88 R130C88 Case 55 100% 80% 70% 60%ac, Case 55 100% 80% 70% 60% a,c e R100C88 R100C88 R120C88 R120C88 R130C88 F R130C88 1814-AA086-M0238, REV. 0 Page 172 of 415

Page 172 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-65 Case 38 Out-of-Plane Tube Inside Density Tube Excitation Ratio vs. Power Level Plot - R130 C88 1814-AA086-M0238, REV. 0 Page 173 of 415

Page 173 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-66 Case 38 In-Plane Tube Inside Density Tube Excitation Ratio vs. Power Level Plot - R130 C88 1814-AA086-M0238, REV. 0 Page 174 of 415

Page 174 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,.c,e Figure 4-67 Case 55 Out-of-Plane Tube Inside Density Tube Excitation Ratio vs. Power Level Plot - R130 C88 1814-AA086-M0238, REV. 0 Page 175 of 415

Page 175 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c.,e Figure 4-68 Case 55 In-Plane Tube Inside Density Tube Excitation Ratio vs. Power Level Plot - R130 C88 1814-AA086-M0238, REV. 0 Page 176 of 415

Page 176 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Figure 4-69 Two Cable Stabilizer Configuration 1814-AA086-M0238, REV. 0 Page 177 of 415

Page 177 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.5 FIV versus Power Level Discussion As discussed in Section 4.2, the missing AVB cases in Table 4-1 were run at the 100%, 80%,

70%, 60% and 50% power levels. These cases are used to develop a basis for reduced power operation using a tube excitation criterion. The current ECT tube wear data was used to determine an appropriate missing AVB case and then the FASTVIB results were extracted for the various power levels for that case. Note that these cases are based on the number of consecutive AVB wear sites. It is known that the actual number ineffective AVB supports may be larger; however, this approach is used only for comparison purposes. A more detailed evaluation addressing missing AVB supports without wear indications can be found in Section 9 of this report.

Tube excitation ratios were extracted for all power levels for both the out-of-plane and the in-plane direction. The tube excitation ratios focused on tubes with high wear and with support conditions defined by tube wear found near the AVB locations. A plot of the maximum tube excitation ratio for all tubes with significant wear versus power level is shown in Figure 4-70.

Note that the out-of-plane tube excitation ratio values above 1.0 are gap-limited and are not unstable in the classical sense. The displacements in the U-bend are limited by the gap between the tube and the AVB support. The largest displacements generally occur at the AVB support so the out-of-plane vibration can be classified as a rattling of the tube. In-plane instability or instability in the straight leg is not gap-limited such that the tube is free to displace in the empty space between the tubes.

1814-AA086-M0238, REV. 0 Page 178 of 415

Page 178 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,c,e Figure 4-70 Maximum Out-of-Plane and In-Plane Tube Excitation Ratio vs. Power Tubes with Wear >20%

Note: The active tube with the largest excitation ratio is Row 128 Column 92 in Steam Generator 2E088. This plot corresponds to ineffective AVB Case 45.

1814-AA086-M0238, REV. 0 Page 179 of 415

Page 179 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.6 Unit 3 100% Power FIV Evaluation A separate FIV evaluation was performed for the 100% power condition at SONGS Unit 3. The operating parameters for the first operating cycle are slightly different from the design case so a separate ATHOS evaluation was performed. Cases 0 through 78 were evaluated to obtain out-of-plane and in-plane tube excitation ratios to be used to evaluate the as-found condition in Unit 3. Since several of the tubes appear to have AVB wear at all 12 AVB locations, Case 78 was plotted in Figure 4-71 for the out-of-plane direction and Figure 4-72 for the in-plane direction.

An additional comparison was performed comparing the Unit 2 100% power design conditions to the Unit 3 100% power first cycle operating conditions. This comparison uses the same tubes used to compare Steam Generators 2E088 and 2E089 in Section 4.4. The missing AVB case for Tube R1 11C81 was updated to be Case 61 since more eddy current data has become available for this tube since the 2E088 versus 2E089 comparison was performed. This comparison was performed in Table 4-12. The results show that the differences in the tube excitation ratios are small and occur in the second decimal place. Therefore it can be concluded that the differences in the thermal-hydraulic conditions between Unit 2 and Unit 3 are not an explanation as to why the wear is much worse in Unit 3 than it is in Unit 2.

1814-AA086-M0238, REV. 0 Page 180 of 415

Page 180 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-71 Out-of-Plane Tube Excitation Ratio Map - 100% Power - Unit 3 - 12 AVBs Missing (Case 78) 1814-AA086-M0238, REV. 0 Page 181 of 415

Page 181 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 ace Figure 4-72 In-Plane Stability Ratio Map - 100% Power - Unit 3 - 12 AVBs Missing (Case 78) 1814-AA086-M0238, REV. 0 Page 182 of 415

Page 182 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 4-12 Tube Excitation Ratio Comparison Unit 2 vs. Unit 3 - 100 % Power Conditions Out-of-Plane Tube In-Plane Excitation Ratio Excitation Ratio RJC Description Case 2E089 3E088 2E089 3E088 a,c,e R1 19C89 Active Tube in SG 2E089 46 R133C91 Plugged Tube in SG 2E088 18 Ri 1 1081 Tube with Tube-to-Tube 61 Wear SG 2E089 1814-AA086-M0238, REV. 0 Page 183 of 415

Page 183 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4.7 References 4-1 Westinghouse Letter LTR-SGDA-12-24, "San Onofre Units 2 and 3 MHI RSG Flow-Induced Vibration Evaluation Customer Correspondence," May 21, 2012.

4-2 M. J. Pettigrew, C. E. Taylor, and B. S. Kim, "Vibration of Tube Bundles in Two-Phase Cross-Flow: Part I-Hydrodynamic Mass and Damping," Transactions of the ASME Vol. 111, Nov. 1989, pp. 466-477.

4-3 F. Axisa, M. Wullschleger, B. Villard, and C. E. Taylor, "Two-Phase Cross-Flow Damping,"

ASME Publication PVP Vol. 133, Damping-1988, ASME PVP Conference, Pittsburgh, Pa., June 1988.

4-4 Standards of Tubular Exchanger Manufacturers Association, Tubular Exchanger Manufacturers Association, Inc., 7th Edition, New York, NY.

4-5 M. J. Pettigrew, R. J. Rogers, and F. Axisa, "Damping of Multispan Heat Exchanger Tubes: Part 2 In Liquids," ASME PVP Publication PVP Vol. 104, Chicago, IL, July 20-24, 1986, pp. 89-98.

4-6 M. J. Pettigrew and C. E. Taylor, "Damping of Heat Exchanger Tubes in Two-Phase Flow,"

ASME 4 th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise AD Vol. 53-2, Nov. 16-21, 1997, Dallas, TX pp. 407-418.

4-7 Westinghouse Report No. CN-SGMP-12-13, "Thermal-Hydraulic Analysis of the San Onofre Nuclear Generating Station Units 2 and 3 Replacement Steam Generators,"

May 2012.

4-8 H. J. Connors, "Flow-Induced Vibration and Wear of Steam Generator Tubes," Nuclear Technology Vol. 55, Nov. 1981, pp.311-331.

4-9 H. J. Connors, "Fluidelastic Vibration of Tube Arrays Excited by Nonuniform Cross Flow,"

Flow-Induced Vibration of Power Plant Components -PVP-41 edited by M. K. Au-Yang, The American Society of Mechanical Engineers, New York, pp.93-107, 1988.

4-10 "N-1331 Instability of Tube Arrays in Cross Flow," Nonmandatory Appendix N, ASME Boiler and Pressure Vessel Code Section III, "Rules for Construction of Nuclear Power Plant Components," 1998 Edition, The American Society of Mechanical Engineers, New York.

4-11 D. R. Polak and D. S. Weaver, "Vortex Shedding in Normal Triangular Tube Arrays," Flow-Induced Vibration 1994, The 1994 Pressure Vessels and Piping Conference, Minneapolis, Minnesota, ASME Pressure Vessels and Piping Division Report PVP-Vol. 273, pp. 145-156, June 19-23, 1994.

4-12 A. Zukauskas and V. Katinas, "Flow Induced Vibration in Heat Exchanger Tube Banks,"

Proceedings of the IUTAM-IAHR Symposium on PracticalExperiences with Flow-Induced Vibrations, Karlsruhe, Editors E. Naudascher and D. Rockwell, Springer-Verlag, Berlin, pp. 188-196, 1980.

4-13 D. S. Weaver, J. A. Fitzpatrick, and M. EI-Kashlan, "Strouhal Numbers for Heat Exchanger Tube Arrays in Cross Flow," ASME Journal of Pressure Vessel Technology, Vol. 109, pp 219-223.

1814-AA086-M0238, REV. 0 Page 184 of 415

Page 184 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4-14 H. J. Connors, "Vortex Shedding Excitation and Vibration of Circular Cylinders," paper presented at the ASME Pressure Vessels and Piping Technology Conference, PVP-52, San Francisco, CA, Aug. 14, 1980, pp. 47-73.

4-15 San Onofre Nuclear Generating Station Units 2 and 3 Replacement Steam Generators MHI Design Drawings:

A. L5-04FU001, Rev. 6, "Component and Outline Drawing 1/3".

B. L5-04FU051, Rev. 1, "Tube Bundle 1/3".

C. L5-04FU052, Rev. 1, "Tube Bundle 2/3".

D. L5-04FU053, Rev. 3, "Tube Bundle 3/3".

E. L5-04FU101, Rev. 5, "Wrapper Assembly 1/5" F. L5-04FU107, Rev. 3, "Tube Support Plate Assembly 2/3".

G. L5-04FU108, Rev. 3, "Tube Support Plate Assembly 3/3".

H. L5-04FU112, Rev. 1, "Anti-Vibration Bar Assembly 2/9".

I. L5-04FU118, Rev. 3, "Anti-Vibration Bar Assembly 8/9".

4-16 MHI Design Document L5-04GA581, Rev. 1, "San Onofre Nuclear Generating Station, Units 2 & 3 Replacement Steam Generators, Damping Test Result for Stabilizer."

1814-AA086-M0238, REV. 0 Page 185 of 415

Page 185 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 5.0 SONGS Unit 2 Eddy Current Summary and Review 5.1 AVB/TSP Wear An eddy current results file for each Unit 2 SG was received from SCE on June 15, 2012. The original files, in csv format, are captured in Reference 5-1. A brief summary of the tube wear at AVB and tube support plate (TSP) indications is provided in Table 5-1.

Table 5-1 Tube Wear at AVBs and Tube Support Plate Indications SG 2E088 SG 2E089 Maximum wear depth: AVB 35%TW 29%TW Number of AVB wear indications 1757 2591 Number of tubes with AVB wear indications 534 727 Maximum wear depth: TSP 17%TW 20%TW Number of TSP wear indications 225 139 Number of tubes with TSP wear indications 181 119 Maximum wear depth: Freespan (1) N/A 14 Number of freespan wear indications (1) N/A 2 Number of tubes with freespan wear indications (1) N/A 2 (1): Based on field analysis The 2012 results files were used to define the limiting tubes for the FIV analysis.

Table 5-2 provides the eddy current results for the limiting active (unplugged) tubes. The numeric input data of Table 5-2 is based on the field bobbin coil analysis; the values represent the percent through-wall (%TW) of the wear indications at these locations. Westinghouse performed a review of the +Pt data for tubes identified as limiting tubes for the wear analysis based on the field bobbin coil analysis. This analysis scrutinized the +Pt data for detection of wear at all AVB intersections for the purpose of defining the number of potential ineffective AVB support locations. In general, there was good agreement between the field analysis results and WEC review results. However, this review identified additional indications not reported from the field bobbin coil and +Pt analyses. Such indications have low signal strength and a signal character which implies that reporting may be reduced simply to individual analyst judgment.

Such signals, which were scrutinized for the purposes of developing input data for the flow-induced vibration analysis, may not normally be reported during typical field analyses and are considered to contain shallow (i.e., typically <10%TW) depths. Such indications also would not be classified as "missed indications," which typically have a connotation of significant depth with possible tube structural or leakage integrity considerations.

1814-AA086-M0238, REV. 0 Page 186 of 415

Page 186 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-2 Limiting Tube Eddy Current Input Data Row/Col SG Status A01 A02 A03 A04 A05 A06 A07 A08 A09 A10 All A12 97/87 88 Active X 11 25 23 16 X X 119/89 89 Active X X 5 6 17 28 5 X 121/91 89 Active X X 12 15 28 23 131/91 89 Active 8 21 X 6 X 129/93 89 Active X X 15 22 6 126/90 89 Active 1 _1_5 5 12 21 21 X 14 X 113/81 89 Plugged X 16 5 5 X X X 111/81 89 Plugged X 14 8 13 18 X 7 X: Low level wear observed on +Pt data from WEC review 5.1.1 SG 2E088 While the number of AVB wear indications is significant, the reported maximum depth is similar to the results reported for another plant with RSGs of similar size (St. Lucie Unit 2). The observation of TSP wear at the uppermost TSPs is somewhat atypical. In particular, there are a number of TSP wear indications in the region where AVB wear is reported. TSP wear was reported at the other plant with RSGs of this size, but primarily at lower TSP elevations and concentrated on the periphery of the tube bundle.

5.1.2 SG 2E089 While the number of AVB wear indications is significant, the reported maximum depth is similar to the results reported for another plant with RSGs of similar size (St. Lucie Unit 2). The observation of TSP wear at the uppermost TSPs is somewhat atypical. In particular, there are a number of TSP wear indications in the region where AVB wear is reported. TSP wear was reported at the other plant with RSGs of this size, but primarily at lower TSP elevations and concentrated on the periphery of the tube bundle. A larger number of AVB wear indications and number of affected tubes were reported for SG 2E089 but the number of top TSP wear indications and number of affected tubes was larger in SG 2E088 (see Table 5-1). While the number of top TSP wear indications was largest in SG 2E088, SG 2E089 contains a greater density of these indications with the region affected by tube-to-tube wear in the Unit 3 RSGs.

5.1.3 In-Plane Wear Indications (Wear Outside of A VB)

Westinghouse performed a supplemental review of selected eddy current data as part of the support effort for the FIV analysis. This review included an investigation of AVB geometry (e.g.,

AVB symmetry variance at individual tube-AVB intersection locations) and AVB wear data using the available +Pt data for all SG 2E089 tubes with bobbin coil indicated depths of 20%TW or greater, all other tubes in Columns 81 and 82 between Rows 120 and 110, and the identified limiting tubes for the FIV analysis. The SG 2E088 review included the identified limiting tubes for the FIV analysis, which includes both tubes with 35%TW indication depths. Both the hot and cold leg +Pt RPC data for these tubes were reviewed (if available). A total of 70 tubes in 1814-AA086-M0238, REV. 0 Page 187 of 415

Page 187 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 SG 2E089 encompassing 394 bobbin reported indications and 6 tubes in SG 2E088 encompassing 41 bobbin reported indications were reviewed.

This review concluded, or observed that:

1. All wear at the AVBs was found to be contained within the width of the AVBs.

2. For tubes with single-sided or both single- and double-sided AVB wear indications, the majority of single-sided AVB wear indications were found on one flank (side) of the tube.

3. For tubes with the single-sided wear not on the same flank, the side orientation of the indications was grouped. That is, wear could be observed at AVB2 on one flank, with wear at AVB3, AVB4, AVB5, and AVB6 on the opposite flank.

4. AVB symmetry variance (i.e., the variance in spatial elevation of a pair of AVBs for a particular tube) at AVB6, AVB1, and AVB7 had the largest amount of variance as indicated by the 9 5 th percentile variance value (0.32, 0.25, and 0.23 inch, respectively); the variance at all other AVBs was approximately equal.

5. The most extreme AVB symmetry variance of 0.50 inch was not associated with wear at that AVB.

The limiting AVB symmetry variance of 0.50 inch was reported on R100 C76 at AVB3 and a variance of 0.35 inch was reported at AVB4 on the same tube. Since the +Pt data for no other tubes in the vicinity of R100 C76 were reviewed, the +Pt data of R124 C76 and R76 C76 (separated by the tube in question by 23 ptiches in each direction) was reviewed to determine if the alignment variance varied linearly over this span. If the symmetry variance was found to not vary linearly, it could be an indicator of deformed AVBs. On R124 C76, the variance at AVB3 was 0.29 inch, at AVB4, 0.18 inch, on R76 C76 at AVB3, 0.53 inch, at AVB4, 0.42 inch. Thus while the amount of symmetry variance appears large, the trending over the range from Row 124 to Row 76 appears to indicate that the AVBs are not deformed through their strongest section.

5.1.4 A VB Insertion Depths for Column 81 and Tube Denting at A VB Observations A total of 173 dented locations were reported in SG 2E089 based on the field analysis. Dents were reported only at AVB2, AVB3, AVB7, AVB10, and AVB11. Denting patterns were reviewed to determine if any relationship between denting, suspected to be related to atypical AVB twist conditions, could be observed for Column 81. In SG 2E089, denting at AVBs is not reported for Column 81. In Columns 80 and 82, dents are reported on the Row 32 tube at AVB2 and AVB3 and AVB10 and AVB11 on R32 C82. However, nearly all columns from 22 to 160 contain dents near the AVB2/3 or AVB10/11 bend region. Thus it is difficult to associate a potential for freespan tube wear, larger dent AVB wear, with the observed dent patterns.

Additionally, the observance of dents concentrated in Rows 30, 31, and 32 would not be expected to influence tube vibration performance resulting in the observed AVB wear patterns, which show that the majority of the AVB wear is located in higher row tubes. The dents are judged too far removed from the wear locations to be of significance. In addition, the field reported dent voltages show a maximum of only 2.04 volts, which represents a relatively small physical dent size. At AVB7, the dent pattern is more sporadic; denting at AVB7 was not reported for Columns 72 through 93. A review of the bobbin coil data for a sampling of AVB2/3 1814-AA086-M0238, REV. 0 Page 188 of 415

Page 188 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 field reported dent locations indicates that the dents are located on the outboard edge of each AVB. That is, at AVB2, the dents are on the edge towards AVB1 and at AVB3, the dents are on the edge towards AVB4, suggesting that the source of the dent signals is related to AVB flatness near the bend region.

AVB insertion depths were investigated for AVB2/AVB3 and AVB1 0/AVB1 1 on Columns 80, 81, and 82. In accordance with the design drawing, the AVB insertion depth for these columns should be to Row 27. The Row 28 tubes had 10 distinct structure signals, with a return to null between each structure signal (suggesting insertion depth of lower than Row 27). On Row 27 (one tube reviewed), 10 AVBs were observed, and on Row 26 tubes, 8 AVBs were observed. A total of 6 AVBs were observed on a Row 25 tube. This suggests that for the gaps between tube Columns 80/81 and 81/82, the AVB insertion may be slightly deeper than by design. AVB insertion depth would only be expected to negatively affect performance if the insertion depth was less than design.

5.1.5 Estimate of the Number of Ineffective Supports The field eddy current results for the bobbin coil PCT calls and the +Pt coil WAR calls was combined for each tube inspected with both coils. If wear at an AVB was considered to be an indicator of lack of support, the combined bobbin and +Pt RPC data would then provide the most accurate assessment of wear at all AVB locations. The Unit 3, SG 3E088 list of tubes with freespan wear was considered for the Unit 2 SGs so that a direct comparison between the two units could be performed. Cumulative probability distribution plots (histograms) of the frequency of occurrence were plotted against the potential number of AVB wear sites, 1 through 12. This plot, provided on Figure 5-1, shows that there is a systematic difference in the number of wear sites per tube between the two units. The Unit 2 data are clearly normally distributed, which would be expected for typical SG assembly conditions. It is reasonable that some variance about the mean would be expected, and that this variance is normally distributed. On the other hand, the Unit 3 distributions are clearly not normally distributed with substantially larger 5 0 th and 95th percentile wear site per tube values. This could suggest that there is a systematic difference in the support conditions between the two units. Note also that had Unit 3 operated for the entire planned period of 22 EFPMs, additional indications could have initiated, thus increasing the mean value of the number of wear sites per tube.

5.2 Tube-to-Tube Wear and Proximity Review 5.2.1 Initial Tube-to-Tube Proximity Review When tube-to-tube wear was reported at Unit 2, a limited number of tubes (approximately 100) from the Unit 2 PSI were reviewed using bobbin coil methods developed by Westinghouse. The intent of this review was to use laboratory eddy current data to determine proximity conditions.

These methods were developed for another plant that uses the same size tubing as SONGS. In addition, the tubing was fabricated by Sumitomo, the manufacturer of the SONGS tubing, and the laboratory tubing specimens used were from the archive tubing set for this plant. The initial Unit 2 proximity review focused on tubes in Columns 80, 81, and 82 in the area of the tube-to-tube wear with additional tubes examined in Columns 83 through 87, primarily in lower row tubes to determine if the proximity condition was associated with the vertical straight leg indexing.

1814-AA086-M0238, REV. 0 Page 189 of 415

Page 189 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Observable proximity was reported on R115 C81, R113 C81, and R111 C81, with the minimum tube-to-tube gap between R115 and R113 of 0.03 to 0.05 inch and between R113 and R1ll of 0.11 inch. Proximity signals were also reported on R112 C82 and R110 C82. Numerous proximity reports were noted in Column 81, from Row 125 to Row 105; the location of the proximity reports on these tubes were all at the same approximate elevation, from about the middle of the AVB9 to AVB10 span to just below AVB10. Based on the amplitude of these signals, the proximity ranged from [ ]a.bc inch. Similar proximity signals (in both amplitude and location) were also reported in the same rows in Column 80. During the Westinghouse Engineering visit to the site in May 2012, those tubes with proximity signals in the PSI were reviewed in the ISI data and no proximity was noted. Discussion is provided below which indicates that the results of this review of the ISI data cannot be used to make global judgments about the SG 2E089 proximity condition.

5.2.2 Supplemental Proximity Review SCE provided Westinghouse the raw eddy current data for the PSI and ISI inspections. A complete proximity review of the SG 2E089 ISI bobbin data was performed. The results are provided in Figure 5-2. A total of 475 proximity signals were reported from this review. The majority of these proximity signals (60%) are located on the cold leg side of SG 2E089. The 25 largest proximity signals (with regard to bobbin coil signal amplitude) were reviewed in the PSI data. Proximity signals were present in the PSI for all 25 signals. Surprisingly, the ISI proximity signal voltages were increased for most of these. This is contrary to proximity data for other SGs in that when the SGs are oriented vertically, the proximity signals are either reduced compared to the PSI, or cannot be observed in the ISI data. Figure 5-3 presents a plot of all proximity reports of 1 volt or greater (0.06 inch proximity gap or less) for SG 2E089. Note that the majority of these reports are on the cold leg side of the SG. Those tubes with reported bobbin coil wear of 20%TW or greater are also plotted on Figures 5-2 and 5-3 to show the relation, if any, between these data sets. Based on these plots, there does not appear to be a strong relationship between proximity and deeper AVB wear depths. Figures 5-2 and 5-3 include dent locations at AVBs. There appears to be a weak relationship between tube columns with dents at AVBs and deeper AVB wear depths.

The number of proximity reports for SG 2E089 was judged significant enough to warrant a review of the SG 2E089 PSI, SG 2E088 ISI, and SG 2E088 PSI data for all tubes in Rows 80 and higher in Columns 50 through 110. Comparison of the SG 2E089 ISI and PSI proximity results for Columns 50 through 110 shows that there are 363 proximity reports for the ISI and 334 proximity reports for the PSI.

When comparing the ISI and PSI proximity locations, a trend of "shifting" proximity was observed. That is, if proximity signals were observed in the PSI in a particular column in a range of rows, e.g., 92 to 98, the ISI showed proximity was not observed at the PSI tube locations but in rows either above or below the PSI reporting in the same column. Thus, proximity signals were reported at the other inspection in, for example, Rows 88 and 90, or 100 and 102. Another observation of the proximity review was that proximities could be observed on a set of tubes on one leg in the PSI, but on the same tubes on the opposite leg in the ISI. The WEC Engineering review of SG 2E089 indicated that a number of larger voltage proximities from either the PSI or ISI did not have corresponding signals in the opposite inspection after the initial data analysis. That is, a large proximity voltage was reported in the PSI but no corresponding report was present in the ISI data analysis report. A total of 14 of these signals 1814-AA086-M0238, REV. 0 Page 190 of 415

Page 190 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 were reviewed again to ensure that the data analysis was correct; none had proximity signals in the other inspection.

The proximity review for the SG 2E088 ISI data indicates only 141 proximity reports in Columns 50 through 110, while the PSI data indicates 505 reports for those same columns. As for SG 2E089, the trend of shifting proximity, both within the same column and from leg to leg was also observed in SG 2E088. Figure 5-4 presents the plot of the SG 2E088 proximity reports based on the ISI data. Due to the limited number of proximity reports, the plotting scheme was based on the leg, opposed to individual AVB span regions, as was done for Figure 5-2.

The tube-to-tube proximity methods developed by Westinghouse are based on laboratory work.

This effort also considered proximity detection capabilities of RPC (+Pt and pancake coil) probes. The +Pt probe has reduced proximity detection capabilities compared to the bobbin probe; for tube-to-tube gaps of greater than about [ ]a,b,c inch, the +Pt coil failed to detect the tube proximity condition. Once the bobbin proximity results of the SG 2E089 ISI were available, those .tubes tested with the +Pt probe through the entire U-bend region were compared with those tubes with bobbin proximity signals. The +Pt data for four tubes with greater than 1 volt bobbin proximity responses were reviewed; proximity was confirmed with the +Pt coil for all locations. Thus, the +Pt results validate the bobbin results. Figure 5-5 provides a +Pt terrain plot of one of these locations. Based on the Westinghouse laboratory work, a +Pt signal amplitude of 0.56 volt (see Figure 5-5) represents a tube-to-tube proximity gap of [ ]a.bc inch; based on the bobbin coil proximity signal amplitude the tube-to-tube proximity gap is estimated at [ ]a,b,c inch. Of the 475 ISI proximity signals reported, 39 exceeded the laboratory signal amplitude associated with single tube-to-tube contact. The source of these larger signals may be the result of adjacent tubes in the inboard and outboard columns which happen to be in the proximity detection range.

Numerous tubes were reported with "SSA" codes during the SG 2E089 ISI, which also include PRX codes in the results file UTIL1 field; thus, proximity conditions were reported during the IS.

Hence, the proximity conditions were initially reported, but not studied at the level of detail of this report.

5.2.3 Review of Field Reported Wear on R113 C81 and R111 C81 in Unit 2 SG 2E089 The reported freespan wear on R113 C81 and Rlll C81 in SG 2E089 was not originally reported from the bobbin coil analysis. The bobbin coil channel6 signal amplitude is only 0.30 volt at 40 degrees phase.

During the review of the AVB wear scars discussed above, it was observed that the signal response of the tube-to-tube wear reported on R113 C81 and R111 C81 did not exhibit a signal response expected of volumetric degradation. The phase angle response did not show the expected rotation over the range of test frequencies at the middle of the axial flaw length. The phase angles ranged from 55 to 41 degrees for the normal range of differential frequencies (400 to 100 kHz), with little or no distortion of the lissajous. These phase angle responses are out of the flaw plane for outside diameter (OD) volumetric degradation. In addition, the phase angle response had little or no variance over the length of the flaw. Since the depth would be expected to vary over the length of the flaw, a phase angle shift according to the local flaw depth would be expected. Figure 5-6 presents a multi-frequency plot for the signal on R1 13 1814-AA086-M0238, REV. 0 Page 191 of 415

Page 191 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 C81. Figure 5-7 presents a terrain plot of the Ri 13 C81 signal at the center of the suspected flaw.

The R1 13 C81 and R1 11 C81 +Pt signals were compared with similar depth signals from Unit 3 based on +Pt analysis. Tube location R107 C75 from SG 3E088 was reviewed. This tube had two reported tube-to-tube wear signals on the hot leg side, one on the intrados and one on the extrados. Extension of the AVB4 wear scar into the freespan was also observed (due to in-plane tube motion). The signal response of this flaw (extended AVB wear flaw) rotates as expected over the range of test frequencies; see Figure 5-8. One of the +Pt flaw signals exhibited responses nearly identical to the AVB wear extension, the other exhibited response like that on R113 C81 and Rill C81. Figure 5-9 presents a full scan line terrain plot of an elevation crossing of both of the freespan flaws. Note the difference in the two signal responses displayed in the analysis window. Figure 5-10 shows that the signal similar to the signals on R113 C81 and R1ll C81 of SG 2E089 contains a wider, larger amplitude signal (0.36V) near the center of the indication. At this location there is no phase angle change or signal distortion compared to the remainder of the signal. A typical wear signal is located along the same azimuth as this non-typical signal just below the non-typical signal. Figure 5-11 shows the isolated response of the suspect signal on R107 C75.

The +Pt eddy current data of ETSS 27902.2 was reviewed to compare the Ri13 C81 and R111 C81 signals against known flaws of shallow depth. The flaws of this ETSS are axially oriented volumetric degradation and the flaws were produced using a 1/8 inch diameter ball end mill. Thus, these flaws are the most representative industry data with regard to tube-to-tube wear. The data for shallow (5 to 15%TW) flaws of ETSS 27902.2 were reviewed. The signal responses were typical for volumetric degradation. For the 5%TW flaw, the phase angle shift between the 300 kHz differential and 100 kHz differential channels was 66 degrees, from 126 to 60 degrees, while the 300 kHz voltage response was only 0.05 volt. For the 11 %TW flaw, the phase angle shift between the 300 kHz differential and 100 kHz differential channels was 33 degrees, from 106 to 73 degrees, while the 300 kHz voltage response was only 0.17 volt.

For the 15%TW flaw, the phase angle shift between the 300 kHz differential and the 100 kHz differential channels was 42 degrees, from 96 to 54 degrees, while the 300 kHz voltage response was 0.21 volt. Therefore, this comparison establishes that the +Pt signal responses of R113 C81 and R1ll C81 are not similar to the +Pt coil responses of known, shallow, axially oriented degradation.

Finally, a section of 0.75 inch OD x 0.043 inch wall thickness Alloy 690 archive tubing from another plant was modified to include an extended length, shallow (12%TW maximum) wear scar. The flaw was produced using a 0.75 inch diameter ball end mill. The flaw included a short section with uniform depth and end tapers cut at a 0.30 degree taper to runout at the tube OD surface. The tube was eddy current tested using both bobbin and RPC probes. The RPC probe used was a dual coil pancake/+Pt U-bend probe. The +Pt 300 kHz amplitude response was [ ]a,b,c degrees; the phase angle rotation was normal for OD volumetric degradation. The pancake coil response was [ ]a,b,c degrees for the entrance leg.

The bobbin coil channel6 amplitude was [ ]a.b,c degrees. Figure 5-12 and Figure 5-13 provide the +Pt responses for the laboratory simulation. Figure 5-14 and Figure 5-15 provide the pancake coil responses for the laboratory simulation. Figure 5-16 provides the bobbin coil channel6 response for the laboratory simulation. Note there is a distinct entrance and exit signal. Figure 5-17 presents the bobbin coil channel6 response for R1 11 C81. Note there is no exit signal, only a shift in the null point. Note that the bobbin coil channel6 response includes a 1814-AA086-M0238, REV. 0 Page 192 of 415

Page 192 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 similar signal between A06 and A07; review of the +Pt data at this location shows an NDD (No Detectable Degradation) condition.

Various attempts were made to simulate the +Pt response of approximately 40 degrees at 0.20 volt in 300 kHz. These included; a 0.5 mil extended length dent produced by rolling another tube against the test tube while applying a downward force, extended length surface scratches, and impact denting using a round bar oriented at a shallow angle to the test tube axis. The impact dent produced a somewhat similar response with a phase angle of approximately 15 degrees; however, the phase rotation observed on R113 C81 and R1ll C81 could not be reproduced. RPC testing of small radius U-bends has shown that normal horizontal noise rotation of 15 to 25 degrees can be observed as the probe passes through from the straight section through the U-bend. However, this phenomenon has never been studied in larger radius U-bends.

In summary, the review of the R1 13C81 and R1 11 C81 freespan signals shows:

1. Bobbin coil channel6 signal amplitudes have similar character, but of a lesser amplitude than a long shallow tapered wear scar of similar (12%TW) depth,

2. +Pt signal responses of R113 C81 and Rlll C81 are not similar to axially oriented volumetric degradation of similar depths contained in ETSS 27902.2,

3. Pancake coil amplitudes for long shallow tapered wear of similar depth as estimated for these tubes are twice the +Pt amplitude, but the pancake coil data for R113 C81 and R1 11 C81 shows no evidence of degradation,

4. The +Pt phase angle response of R113 C81 and Rlll C81 lies outside of the OD volumetric flaw plane and does not rotate through the test frequencies as expected,

5. The characteristic signal of these suspected flaws is not similar to freespan wear which extends out of the AVBs (Unit 3 experience).

It was theorized that if the +Pt signals on Ri 11 C81 and Ri 13 C81 in SG 2E089 were in fact associated with freespan volumetric degradation, that one possible explanation for the observed signal characteristics was due to the signal combination of a ding (dent) signal and shallow flaw signal. The combination of these two signal responses could produce a resultant signal as observed on these tubes.

Based on these observations, SCE performed additional eddy current inspections of these tubes using the Ghent-3/4 transmit-receive probe and ultrasonic testing (UT) methods. The Ghent-3/4 data suggests that the signal is most likely attributed to a combined ding-flaw response. The UT effort also confirmed the presence of shallow OD volumetric degradation.

Therefore, it can be concluded that the source of the +Pt signals on R1 11 C81 and R1 13 C81 in SG 2E089 are associated with very shallow depth freespan OD volumetric degradation, with a geometric influence such as a ding-like signal of extended length. It should be noted that the characteristics of these signals are markedly different from the majority of the freespan OD volumetric degradation signals observed in the Unit 3 RSGs. Also, as the field +Pt signal depth sizing returned a depth of 14%TW, and this signal contains both ding and flaw components, the true. depth of the indications are likely <1 0%TW.

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Page 193 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 5.3 Tube Plugging Summary Files provided by SCE identify tube plugging and stabilization. These files are reproduced in Table 5-3 for SG 2E088 and Table 5-4 for SG 2E089. The plugging and stabilization status shown in Tables 5-3 and 5-4 were current as of June 2012. Due to ongoing SG recovery efforts, the plugging and stabilizing strategy are subject to change. The numbers shown in these tables may change prior to startup. Note that 5 additional tubes (2 in SG 2E088 and 3 in SG 2E089) were plugged as a result of the recently completed analysis. These tubes are identified in Table 9-6 under the columns labeled 70% power. Due to the small number of affected tubes, plugging these 5 additional tubes will have an insignificant impact on the SG thermal-hydraulic response or the FIV response of the tubes.

A total of 205 tubes were plugged in SG 2E088, 125 of these had stabilizers of varying length installed.

A total of 305 tubes were plugged in SG 2E088, 226 of these had stabilizers of varying length installed.

5.4 Summary of Unit 3 Eddy Current Review A review of the Unit 3, SG 3E088 +Pt data for tubes with and without freespan wear was conducted. The review concentrated on the AVB wear signals. As tube-to-tube wear was already known in SG 3E088, and extension of the wear outside of the AVBs was confirmed visually, a review of this data to determine if extension of the wear scars was occurring is academic. Instead the review concentrated on the direction of the wear extension (i.e., towards which AVB was the wear oriented). If the tube is experiencing in-plane displacement in the vicinity of AVB3, and the direction of the tube motion is towards AVB2, or towards the next highest row, wear at AVB3, which extends outside of the boundary of the AVB, would be directed towards AVB4.

The initial review was focused on those tubes with tube-to-tube wear and the fewest number of AVBs with wear reported by the bobbin coil. These tubes would be expected to be the most challenging for simulation of in-plane displacement using the Westinghouse FIV models. These tubes are typically the lowest and highest row tubes in a column with tube-to-tube wear. These tubes were termed "boundary" tubes. It is possible that these tubes are stable with regard to in-plane displacement and that the observed wear is generated by the in-plane displacement of an adjacent tube. Thus, the review was extended to include adjacent (same column) tubes also reported with tube-to-tube wear. As it would be advantageous for refinement of the FIV model, selected columns of tubes were also reviewed beginning at row locations just outside of the tube-to-tube wear region, through this region, and just outside of the region at the opposite side.

In other words, if tube-to-tube wear was reported in Column 78 on Rows 90 to 100, the review would include tube locations R90 to R100 in C78, plus, R86 and R104 in Column 78. It was judged that this review would provide insight about the tube motions and thus vibration mode shapes.

As with the Unit 2 review, all AVB intersections with observable wear were identified, if the intersection contained single- or double-sided wear, if the wear scars were flat (uniformly deep depth profile) or tapered, if there was any AVB symmetry variance of adjacent AVBs, and if so, this variance was measured, All wear at an AVB intersection was reviewed to determine if the wear extended outside of the AVB edges, and if extended, the distance outside of the AVB that 1814-AA086-M0238, REV. 0 Page 194 of 415

Page 194 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 the wear scar extended, and the direction of the wear extension (towards which AVB). The summary of observed wear was provided to the analysts performing the FIV analysis for refinement of the FIV model.

Figure 5-18 presents a tubesheet map identifying those tubes included in this review; data for all 12 AVBs was reviewed.

5.4.1 Observations Related to A VB Symmetry Variance and Wear Scar Geometry Compared to Unit 2, the observations of AVB symmetry variance were not as prevalent in Unit

3. The observation of tapered wear, suggestive of rotational twisted AVBs, was observed less frequently compared to Unit 2.

The wear mode, either single- or double-sided, was also tracked and compiled. For the tubes reviewed, it was observed that those tubes with tube-to-tube wear had a much higher incidence of double-sided AVB wear. For those SG 3E088 tubes with tube-to-tube wear that were reviewed, 57% of the AVB locations with wear exhibited double-sided wear. For those SG 3E088 tubes with tube-to-tube wear, 23% of the AVB locations with wear exhibited double-sided wear. For SG 2E089, 27% of the AVB locations with wear exhibited double-sided wear.

5.4.2 ObservationsRelated to Tube Motions For each tube reviewed, a "motion plot" was prepared which identifies the direction of the tube displacement. Note that the direction of the tube displacement is opposite to the direction of the AVB wear scar extension. These plots were used to help to define the tube vibration mode shapes. An example of these plots is provided on Figure 5-19. The general observations regarding these plots was that for the boundary tubes, the displacement direction was only towards one side (leg) of the tube, and the number of AVB wear scars which extended from the AVB were fewer compared to tubes located more in the middle of the tube-to-tube wear region.

With regard to the direction of the tube displacement, the boundary tubes which had extension of the AVB wear scar outside of the AVB was strongly preferenced towards the increasing row direction, or towards the hot leg periphery. In the middle of the tube-to-tube wear region, the tubes showed a much greater propensity to experience a back-and-forth motion, or "frame motion." This back-and forth motion was observed at AVB3 through AVB10, with AVB5 through AVB8 showing this phenomenon more frequently than other locations.

5.4.3 Observations of Wear at the Top TSP Wear characteristics at the uppermost TSPs were reviewed for a limited subset of tubes with the purpose of attempting to show a distinguishing feature between the wear at this location for the two units. It was previously established that the magnitude (depth) of the uppermost TSPs in Unit 3 is significantly greater than Unit 2 (by about a factor of 3). However, if a distinguishing characteristic is present in both units, it could be an indicator of incipient susceptibility in Unit 2, at 100% power conditions.

The +Pt data for the following locations was reviewed to attempt to identify uppermost TSP wear trends.

1814-AA086-M0238, REV. 0 Page 195 of 415

Page 195 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 SG2E088 SG2E089 SG3E088 R109 C79 07H* R131 C57 07H R112 C74 07C R113 C81 07H* R112 C82 07C R112 C74 07H R112 C84 07C R102 C76 07H R90 C84 07H R100 C78 07C R109 C85 07H R100 C76 07H R117 C87 07H R106 C78 07C R95 C91 07H* R106 C78 07H R120 C78 07C R120 C78 07H R93 C85 07C R93 C85 07H R109 C85 07H R103 C89 07C R103 C89 07H R93 C75 07H**

R85 C85 07H**

• Active tube

• • Tube did not contain tube-to-tube wear The TSP design is such that the extrados of the tube is coincident with a TSP contact land. The

+Pt data was interrogated using the AVBs as a reference point to then identify the tube extrados, as a contact land would always be centered between two AVBs. This contact land was classified as the 0 degree position for this study. The other contact lands would then be oriented at 120 and 240 degrees. For this study, the contact lands will only be referred to singularly as flanks. The TSP wear indictions were characterized by first recording the number of lands with adjacent wear, if the deepest part of the wear was at the top or bottom edge of the TSP, if the wear was uniformly deep or tapered, and a relative wear length categorized generally by the TSP thickness in 1/4 thickness increments (i.e., 1/4, Y2, % or 1.0 relative TSP thickness).

SG 2E088 For both tubes reviewed, the TSP wear was located at 07H, only the 0 degree land had wear, the deepest depth was at the bottom of the TSP, the profile was flat, and the length was 1/4 of the TSP thickness. The observation of flat wear may be an artifact of the shallow depth, or, could imply that the tube was wearing along the face of the chamfer.

SG 2E089 As the deepest reported TSP wear was only 20%TW, it would be expected that the developed wear lengths were less than the TSP thickness, especially since the large edge chamfer applied to the TSP would not permit full length wear if the tubes were not experiencing some amount of rotation at the top TSPs.

Of the seven tubes reviewed, five had the deepest wear oriented at 0 degrees. For most, the deepest depth occurred at the bottom edge of the TSP. For R109 C85, the deepest depth occurred on a flank land and appeared to be coincident with the edge of the chamfer near the 1814-AA086-M0238, REV. 0 Page 196 of 415

Page 196 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 center of the TSP. The relative lengths were mostly reported at /2 of the TSP thickness, and most exhibited a tapered profile. The only tube on which the deepest depth was reported at the top edge of the TSP was R131 C57; the deepest wear depth was reported on a flank land. If wear was observed on more than one land, and the deepest depth was observed at the bottom edge of the TSP, the deepest depth of the wear on the other lands was observed at the opposite edge of the TSP.

SG 3E088 The deepest depths were overwhelmingly observed at the 0 degree land, and at the bottom edge of the TSP. Most of the wear exhibited a tapered profile, and many extended for the full thickness of the TSP. Of the 16 locations reviewed, only 3 were found to have the deepest depth on a flank land. These were R106 C78 at 07C, R103 C89 at 07C and R103 C89 at 07H.

With the exception of the tubes which did not contain tube-to-tube wear, wear was observed on 2 or 3 of the lands. The overwhelming observation that the deepest depth of wear was reported at the edge of the TSP suggests one of two scenarios. Either some amount of TSP rotation is occurring, which then causes the tube to interact with the edge of the TSP, thus overcoming the effects of the chamfer applied to the top and bottom surfaces of the TSPs, or, the tube is experiencing significant rotations.

One interesting observation was made for the wear at 07H on R106 C78. Single-sided AVB wear was observed at AVB5. The deepest wear was observed on the 0 degree land. Of the two flank lands, one had a deeper depth than the other. The wear located on the deeper of the two flank lands was consistent with the side of the tube that experienced the wear at AVB5.

Another observation was that the elevations of the edges of the wear scars were not coincident with the edges of the TSPs. Figures 5-20, 5-21, and 5-22 show this for R93 C85 of SG 3E088 at the 07H location. Figure 5-20 provides the +Pt terrain plot of the lower edge of the TSP. The cursor (white arrow) is located at the edge of the wear, notice that the cursor location is slightly below the TSP edge in the lower plot. The cursor position remains consistent throughout each plot. Figure 5-21 provides the +Pt terrain plot of the upper edge of the TSP. The cursor (white arrow) is located at the edge of the TSP, notice that the cursor location is slightly above the edge of the wear in the upper plot. Figure 5-22 provides the +Pt terrain plot of the TSP edge showing the vertical offset distance between the top edge of the TSP and edge of the wear.

The +Pt scale was normalized to the TSP thickness, thus, the offset amount of 0.26 inch is judged to be representative. Such a condition would be expected based on the difference in thermal expansion coefficients between the tube and tube support structure. Notice that the deepest portion of the wear (shown by the amplitude of the wear signals) is located at the edge of the wear length. This condition could then only be observed if the tube were experiencing large rotations as the edge chamfer applied to the TSP would have to be overcome by the tube rotation. The observation that the deepest wear was observed on the 0 degree land implies that there is a difference in depth on the flank lands. As one of the flank lands is not only deeper but longer than the opposite flank land can imply that the the tube is experiencing both in-plane displacement as well as out-of-plane displacement where the tube is preferentially deflected to one side. Figure 5-23 presents the motion plot of R93 C85. Note that the wear extension at AVB5 is in both directions.

Table 5-5 provides a summary of the results of this review.

1814-AA086-M0238, REV. 0 Page 197 of 415

Page 197 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 5.5 References 5-1 LTR-SGMP-12-41, "In-Service Eddy Current Inspection Results for SONGS 2 and 3 Provided by SCE," July, 2012.

1814-AA086-M0238, REV. 0 Page 198 of 415

Page 198 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-3 SG 2E088 Tube Plugging and Stabilization List U2 NECP 800873488 U2 NECP 800873488 RSG 2E-088 Tube Plugging & Stabilizing Map/List RSG 2E-088 Tube Plugging & Stabilizing Map/List Stab Row Col Plug Stab Reason Row Col Stab Plug Stab Length Reason Le ngth 108 34 Yes No Preventative - Retainer Bar 126 128 Yes No Preventative - Retainer Bar 111 35 Yes No Preventative- Retainer Bar 123 129 Yes No Preventative- Retainer Bar 110 36 Yes No Preventative - Retainer Bar 125 129 Yes No Preventative - Retainer Bar 112 36 Yes No Preventative - Retainer Bar 122 130 Yes No Preventative - Retainer Bar 111 37 Yes No Preventative - Retainer Bar 124 130 Yes No Preventative - Retainer Bar 113 37 Yes No Preventative - Retainer Bar 121 131 Yes No Preventative - Retainer Bar 112 38 Yes No Preventative - Retainer Bar 123 131 Yes No Preventative - Retainer Bar 114 38 Yes No Preventative - Retainer Bar 122 132 Yes No Preventative - Retainer Bar 113 39 Yes No Preventative - Retainer Bar 119 133 Yes No Preventative - Retainer Bar 115 39 Yes No Preventative - Retainer Bar 118 134 Yes No Preventative - Retainer Bar 114 40 Yes No Preventative- Retainer Bar 120 134 Yes No Preventative - Retainer Bar 116 40 Yes No Preventative - Retainer Bar 117 135 Yes No Preventative - Retainer Bar 115 41 Yes No Preventative - Retainer Bar 119 135 Yes No Preventative - Retainer Bar 117 41 Yes No Preventative - Retainer Bar 116 136 Yes No Preventative - Retainer Bar 116 42 Yes No Preventative - Retainer Bar 118 136 Yes No Preventative - Retainer Bar 118 42 Yes No Preventative - Retainer Bar 115 137 Yes No Preventative - Retainer Bar 117 43 Yes No Preventative - Retainer Bar 117 137 Yes No Preventative - Retainer Bar 119 43 Yes No Preventative - Retainer Bar 114 138 Yes No Preventative- Retainer Bar 118 44 Yes No Preventative - Retainer Bar 116 138 Yes No Preventative - Retainer Bar 120 44 Yes No Preventative - Retainer Bar 113 139 Yes No Preventative - Retainer Bar 119 45 Yes No Preventative - Retainer Bar 115 139 Yes No Preventative - Retainer Bar 122 46 Yes No Preventative - Retainer Bar 112 140 Yes No Preventative - Retainer Bar 121 47 Yes No Preventative - Retainer Bar 114 140 Yes No Preventative- Retainer Bar 123 47 Yes No Preventative - Retainer Bar 111 141 Yes No Preventative - Retainer Bar 122 48 Yes No Preventative - Retainer Bar 113 141 Yes No Preventative - Retainer Bar 110 142 Yes No Preventative - Retainer Bar 123 49 Yes No Preventative - Retainer Bar 112 142 Yes No Preventative - Retainer Bar 124 50 Yes No Preventative - Retainer Bar 111 143 Yes No Preventative - Retainer Bar 126 50 Yes No Preventative - Retainer Bar 108 144 Yes No Preventative - Retainer Bar 125 51 Yes No Preventative - Retainer Bar 110 34 Yes Yes 668 Preventative - Retainer Bar 127 51 Yes No Preventative - Retainer Bar 109 35 Yes Yes 668 Preventative - Retainer Bar 126 52 Yes No Preventative - Retainer Bar 121 45 Yes Yes 668 Preventative - Retainer Bar 128 52 Yes No Preventative - Retainer Bar 120 46 Yes Yes 668 Preventative - Retainer Bar 127 53 Yes No Preventative - Retainer Bar 124 48 Yes Yes 668 35% < TWD 129 53 Yes No Preventative - Retainer Bar 125 49 Yes Yes 668 35%:<TWD 128 54 Yes No Preventative - Retainer Bar 130 56 Yes Yes 668 Preventative - Retainer Bar 130 54 Yes No Preventative- Retainer Bar 132 56 Yes Yes 668 Preventative - Retainer Bar 129 55 Yes No Preventative- Retainer Bar 121 81 Yes Yes 668 Preventative - FSW 131 55 Yes No Preventative- Retainer Bar 120 82 Yes Yes 668 Preventative - FSW 131 57 Yes No Preventative- Retainer Bar 105 83 Yes Yes 668 Preventative - FSW 131 121 Yes No Preventative- Retainer Bar 107 83 Yes Yes 668 Preventative - FSW 129 123 Yes No Preventative- Retainer Bar 131 123 Yes No Preventative- Retainer Bar 98 84 Yes Yes 668 Wear at 6 Continuous AVBs 128 124 Yes No Preventative- Retainer Bar 104 84 Yes Yes 668 Preventative - FSW 130 124 Yes No Preventative - Retainer Bar 106 84 Yes Yes 668 Preventative - FSW 127 125 Yes No Preventative - Retainer Bar 108 84 Yes Yes 668 Preventative - FSW 129 125 Yes No Preventative - Retainer Bar 122 84 Yes Yes 668 Preventative - FSW 126 126 Yes No Preventative- Retainer Bar 97 85 Yes Yes 668 Preventative - FSW 128 126 Yes No Preventative - Retainer Bar 99 85 Yes Yes 668 Preventative - FSW 125 127 Yes No Preventative - Retainer Bar 103 85 Yes Yes 668 Preventative - FSW 127 127 Yes No I Preventative - Retainer Bar 105 85 Yes Yes 668 Preventative - FSW 124 11281 Yes No Preventative - Retainer Bar 107 85 I Yes Yes 668 Preventative - FSW 1814-AA086-M0238, REV. 0 Page 199 of 415

Page 199 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-3 (cont'd)

SG 2E088 Tube Plugging and Stabilization List U2 NECP 800873488 U2 NECP 800873488 RSG 2E-088 Tube Pluming & Stabilizing Mah/List RSG 2E-088 Tube Plueeine & Stabilizing Map/List Stab Row Col Plug Stab Reason Row Col Plug Stab Stab Reason Length 115 85 Yes Yes 668 Preventative - FSW 94 90 Yes Yes 668 Preventative - FSW 121 85 Yes Yes 668 Preventative- FSW 100 90 Yes Yes 668 Preventative - FSW 123 85 Yes Yes 668 Preventative - FSW 102 90 Yes Yes 668 Preventative - FSW 133 85 Yes Yes 668 Preventative - FSW 104 90 Yes Yes 668 Preventative - FSW 98 86 Yes Yes 668 Preventative - FSW 106 90 Yes Yes 668 Preventative- FSW 100 86 Yes Yes 668 Preventative - FSW 108 90 Yes Yes 668 Wear at 6 Continuous AVBs 102 86 Yes Yes 668 Preventative- FSW 110 90 Yes Yes 668 Preventative - FSW 104 86 Yes Yes 668 Preventative- FSW 112 90 Yes Yes 668 Preventative - FSW 106 86 Yes Yes 668 Preventative - FSW 114 90 Yes Yes 668 Preventative - FSW 108 86 Yes Yes 668 Preventative - FSW 116 90 Yes Yes 668 Preventative - FSW 112 86 Yes Yes 668 Preventative - FSW 95 91 Yes Yes 668 Preventative - FSW 114 86 Yes Yes 668 Preventative - FSW 101 91 Yes Yes 668 Preventative - FSW 116 86 Yes Yes 668 Preventative - FSW 103 91 Yes Yes 668 Preventative - FSW 122 86 Yes Yes 668 Preventative - FSW 105 91 Yes Yes 668 Preventative - FSW 124 86 Yes Yes 668 Preventative - FSW 107 91 Yes Yes 668 Preventative - FSW 126 86 Yes Yes 668 Preventative - FSW 109 91 Yes Yes 668 Preventative - FSW 101 87 Yes Yes 668 Preventative - FSW 111 91 Yes Yes 668 Preventative - FSW 103 87 Yes Yes 668 Preventative - FSW 113 91 Yes Yes 668 Preventative - FSW 105 87 Yes Yes 668 Preventative- FSW 115 91 Yes Yes 668 Preventative - FSW 111 87 Yes Yes 668 Preventative - FSW 117 91 Yes Yes 668 Preventative - FSW 113 87 Yes Yes 668 Preventative - FSW 133 91 Yes Yes 668 35%: -TWD 115 87 Yes Yes 668 Preventative- FSW 98 92 Yes Yes 668 Preventative - FSW 121 87 Yes Yes 668 Preventative- FSW 100 92 Yes Yes 668 Preventative - FSW 123 87 Yes Yes 668 Preventative - FSW 102 92 Yes Yes 668 Preventative - FSW 125 87 Yes Yes 668 Preventative - FSW 104 92 Yes Yes 668 Preventative - FSW 88 88 Yes Yes 668 Wear at 6 Continuous AVBs 106 92 Yes Yes 668 Preventative - FSW 100 88 Yes Yes 668 Preventative - FSW 108 92 Yes Yes 668 Preventative - FSW 102 88 Yes Yes 668 Preventative - FSW 110 92 Yes Yes 668 Preventative - FSW 104 88 Yes Yes 668 Preventative - FSW 112 92 Yes Yes 668 Preventative - FSW 106 88 Yes Yes 668 Preventative - FSW 114 92 Yes Yes 668 Preventative - FSW 110 88 Yes Yes 668 Preventative - FSW 116 92 Yes Yes 668 Preventative - FSW 112 88 Yes Yes 668 35%STWD 118 92 Yes Yes 668 Preventative - FSW 114 88 Yes Yes 668 Preventative - FSW 120 92 Yes Yes 668 30 < TWD < 35%

116 88 Yes Yes 668 Preventative - FSW 124 92 Yes Yes 668 Wear at 6 Continuous AVBs 118 88 Yes Yes 668 Preventative - FSW 136 92 Yes Yes 668 Preventative - FSW 120 88 Yes Yes 668 Preventative - FSW 99 93 Yes Yes 668 Preventative - FSW 122 88 Yes Yes 668 Preventative- FSW 101 93 Yes Yes 668 Preventative - FSW 124 88 Yes Yes 668 Preventative - FSW 103 93 Yes Yes 668 Preventative - FSW 95 89 Yes Yes 668 Preventative - FSW 107 93 Yes Yes 668 Preventative - FSW 97 89 Yes Yes 668 Wearat 6ContinuousAVBs 111 93 Yes Yes 668 Preventative - FSW 101 89 Yes Yes 668 Preventative - FSW 117 93 Yes Yes 668 Preventative - FSW 103 89 Yes Yes 668 Preventative - FSW 129 93 Yes Yes 668 Preventative - FSW 105 89 Yes Yes 668 Preventative - FSW 94 94 Yes Yes 668 Preventative - FSW 107 89 Yes Yes 668 Preventative- FSW 128 94 Yes Yes 668 30% < TWD < 35%

111 89 Yes Yes 668 Preventative - FSW 134 94 Yes Yes 668 Wear at 6 Continuous AVBs 113 89 Yes Yes 668 Preventative - FSW 130 122 Yes Yes 668 Preventative - Retainer Bar 115 89 Yes Yes 668 Preventative - FSW 132 122 Yes Yes 668 Preventative - Retainer Bar 117 89 Yes Yes 668 Preventative - FSW 120 132 Yes Yes 668 Preventative- RetainerBar 119 89 Yes Yes 668 Preventative - FSW 121 133 Yes Yes 668 Preventative - Retainer Bar 121 89 Yes Yes 668 Preventative - FSW 109 143 Yes Yes 668 Preventative - Retainer Bar 123 89 Yes Yes 668 Preventative - FSW 110 144 Yes Yes 668 Preventative- Retainer Bar 127 89 Yes Yes 668 Preventative - FSW 1814-AA086-M0238, REV. 0 Page 200 of 415

Page 200 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-4 SG 2E089 Tube Plugging and Stabilization List U2 NECP 800873488 U2 NECP 800873488 RSG 2E-089 Tube Plugging & Stabilizing Map/List RSG 2E-089 Tube Plugging & Stabilizing Map/List Stab Stab Row Col Plug Stab Reason Row Col Plug Stab Reason Length Length 108 34 Yes No Preventative- Retainer Bar 126 128 Yes No Preventative- Retainer Bar 111 35 Yes No Preventative - Retainer Bar 123 129 Yes No Preventative - Retainer Bar 110 36 Yes No Preventative - Retainer Bar 125 129 Yes No Preventative - Retainer Bar 112 36 Yes No Preventative - Retainer Bar 122 130 Yes No Preventative - Retainer Bar 111 37 Yes No Preventative - Retainer Bar 124 130 Yes No Preventative - Retainer Bar 113 37 Yes No Preventative - Retainer Bar 121 131 Yes No Preventative - Retainer Bar 112 38 Yes No Preventative - Retainer Bar 123 131 Yes No Preventative - Retainer Bar 114 38 Yes No Preventative - Retainer Bar 122 132 Yes No Preventative - Retainer Bar 113 39 Yes No Preventative - Retainer Bar 118 134 Yes No Preventative - Retainer Bar 115 39 Yes No Preventative - Retainer Bar 120 134 Yes No Preventative - Retainer Bar 114 40 Yes No Preventative - Retainer Bar 117 135 Yes No Preventative - Retainer Bar 116 40 Yes No Preventative - Retainer Bar 119 135 Yes No Preventative - Retainer Bar 115 41 Yes No Preventative - Retainer Bar 116 136 Yes No Preventative - Retainer Bar 117 41 Yes No Preventative - Retainer Bar 118 136 Yes No Preventative - Retainer Bar 116 42 Yes No Preventative - Retainer Bar 115 137 Yes No Preventative - Retainer Bar 118 42 Yes No Preventative - Retainer Bar 117 137 Yes No Preventative - Retainer Bar 117 43 Yes No Preventative - Retainer Bar 114 138 Yes No Preventative - Retainer Bar 119 43 Yes No Preventative - Retainer Bar 116 138 Yes No Preventative - Retainer Bar 120 44 Yes No Preventative - Retainer Bar 113 139 Yes No Preventative - Retainer Bar 119 45 Yes No Preventative - Retainer Bar 115 139 Yes No Preventative - Retainer Bar 122 46 Yes No Preventative - Retainer Bar 112 140 Yes No Preventative - Retainer Bar 121 47 Yes No Preventative - Retainer Bar 114 140 Yes No Preventative - Retainer Bar 123 47 Yes No Preventative - Retainer Bar 111 141 Yes No Preventative - Retainer Bar 122 48 Yes No Preventative - Retainer Bar 113 141 Yes No Preventative - Retainer Bar 124 48 Yes No Preventative - Retainer Bar 110 142 Yes No Preventative - Retainer Bar 123 49 Yes No Preventative - Retainer Bar 112 142 Yes No Preventative - Retainer Bar 125 49 Yes No Preventative - Retainer Bar 111 143 Yes No Preventative - Retainer Bar 124 50 Yes No Preventative - Retainer Bar 108 144 Yes No Preventative - Retainer Bar 126 50 Yes No Preventative - Retainer Bar 110 34 Yes Yes 668 Preventative - Retainer Bar 125 51 Yes No Preventative - Retainer Bar 109 35 Yes Yes 668 Preventative - Retainer Bar 127 51 Yes No Preventative - Retainer Bar 118 44 Yes Yes 668 Preventative - Retainer Bar 126 52 Yes No Preventative - Retainer Bar 121 45 Yes Yes 668 Preventative - Retainer Bar 128 52 Yes No Preventative - Retainer Bar 120 46 Yes Yes 668 Preventative - Retainer Bar 127 53 Yes No Preventative - Retainer Bar 130 56 Yes Yes 668 Preventative - Retainer Bar 129 53 Yes No Preventative - Retainer Bar 132 56 Yes Yes 668 Preventative - Retainer Bar 128 54 Yes No Preventative - Retainer Bar 98 76 Yes Yes 668 Wear at 6 Continuous AVBs 130 54 Yes No Preventative - Retainer Bar 103 77 Yes Yes 668 Preventative - FSW 129 55 Yes No Preventative - Retainer Bar 109 77 Yes Yes 668 Preventative - FSW 131 55 Yes No Preventative - Retainer Bar 111 77 Yes Yes 668 Preventative - FSW 131 57 Yes No Preventative - Retainer Bar 100 78 Yes Yes 668 Preventative - FSW 131 121 Yes No Preventative - Retainer Bar 102 78 Yes Yes 668 Preventative - FSW 129 123 Yes No Preventative - Retainer Bar 104 78 Yes Yes 668 Preventative - FSW 131 123 Yes No Preventative - Retainer Bar 108 78 Yes Yes 668 Preventative - FSW 128 124 Yes No Preventative - Retainer Bar 110 78 Yes Yes 668 Preventative - FSW 130 124 Yes No Preventative - Retainer Bar 112 78 Yes Yes 668 Preventative - FSW 127 125 Yes No Preventative- Retainer Bar 87 79 Yes Yes 668 Wearat 6ContinuousAVBs 129 125 Yes No Preventative - Retainer Bar 97 79 Yes Yes 668 Preventative - FSW 126 126 Yes No Preventative - Retainer Bar 99 79 Yes Yes 668 Preventative - FSW 128 126 Yes No Preventative - Retainer Bar 101 79 Yes Yes 668 Preventative - FSW 125 127 Yes No Preventative - Retainer Bar 111 79 Yes Yes 668 Preventative - FSW 124 128 Yes No Preventative - Retainer Bar 92 80 Yes Yes 668 Preventative - FSW 1814-AA086-M0238, REV. 0 Page 201 of 415

Page 201 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-4 (cont'd)

SG 2E089 Tube Plugging and Stabilization List U2 NECP 800873488 U2 NECP 800873488 RSG 2E-089 Tube Plugging & Stabilizing Map/List RSG 2E-089 Tube Plugging & Stabilizing Map/List Stab Stab Row Col Plug Stab Reason Row Col Plug Stab Reason Length Length 94 80 Yes Yes 668 Preventative - FSW 109 83 Yes Yes 668 Preventative - FSW 96 80 Yes Yes 668 Preventative - FSW 111 83 Yes Yes 668 Preventative - FSW 98 80 Yes Yes 668 Preventative - FSW 113 83 Yes Yes 668 Preventative - FSW 100 80 Yes Yes 668 Preventative - FSW 115 83 Yes Yes 668 Preventative - FSW 102 80 Yes Yes 668 Preventative - FSW 117 83 Yes Yes 668 Preventative - FSW 110 80 Yes Yes 668 Preventative - FSW 119 83 Yes Yes 668 Preventative - FSW 112 80 Yes Yes 668 Preventative - FSW 121 83 Yes Yes 668 Preventative - FSW 114 80 Yes Yes 668 Preventative - FSW 90 84 Yes Yes 668 Preventative - FSW 91 81 Yes Yes 668 Preventative - FSW 92 84 Yes Yes 668 Preventative - FSW 93 81 Yes Yes 668 Preventative - FSW 94 84 Yes Yes 668 Preventative - FSW 95 81 Yes Yes 668 Preventative - FSW 96 84 Yes Yes 668 Preventative - FSW 97 81 Yes Yes 668 Preventative - FSW 98 84 Yes Yes 668 Preventative - FSW 99 81 Yes Yes 668 Preventative - FSW 100 84 Yes Yes 668 Preventative - FSW 101 81 Yes Yes 668 Preventative - FSW 102 84 Yes Yes 668 Preventative - FSW 103 81 Yes Yes 668 Preventative - FSW 104 84 Yes Yes 668 Preventative - FSW 105 81 Yes Yes 668 Preventative - FSW 106 84 Yes Yes 668 Preventative - FSW 107 81 Yes Yes 668 Preventative - FSW 108 84 Yes Yes 668 Preventative - FSW 109 81 Yes Yes 668 Preventative - FSW 110 84 Yes Yes 668 Preventative - FSW 111 81 Yes Yes 750 FSW 112 84 Yes Yes 668 Preventative - FSW 113 81 Yes Yes 750 FSW 114 84 Yes Yes 668 Preventative - FSW 115 81 Yes Yes 668 Preventative - FSW 116 84 Yes Yes 668 Preventative - FSW 117 81 Yes Yes 668 Preventative - FSW 118 84 Yes Yes 668 Preventative - FSW 119 81 Yes Yes 668 Preventative - FSW 120 84 Yes Yes 668 Preventative - FSW 121 81 Yes Yes 668 Preventative - FSW 122 84 Yes Yes 668 Wear at 6 ContinuousAVBs 90 82 Yes Yes 668 Preventative - FSW 126 84 Yes Yes 668 Preventative - FSW 92 82 Yes Yes 668 Preventative - FSW 128 84 Yes Yes 668 Preventative - FSW 94 82 Yes Yes 668 Preventative - FSW 132 84 Yes Yes 668 Preventative - FSW 96 82 Yes Yes 668 Preventative - FSW 91 85 Yes Yes 668 Preventative - FSW 98 82 Yes Yes 668 Preventative - FSW 93 85 Yes Yes 668 Preventative - FSW 100 82 Yes Yes 668 Preventative - FSW 95 85 Yes Yes 668 Preventative - FSW 102 82 Yes Yes 668 Preventative - FSW 97 85 Yes Yes 668 Preventative - FSW 104 82 Yes Yes 668 Preventative - FSW 99 85 Yes Yes 668 Preventative - FSW 106 82 Yes Yes 668 Preventative - FSW 101 85 Yes Yes 668 Preventative - FSW 108 82 Yes Yes 668 Preventative - FSW 103 85 Yes Yes 668 Preventative - FSW 110 82 Yes Yes 668 Preventative - FSW 105 85 Yes Yes 668 Preventative - FSW 112 82 Yes Yes 668 Preventative - FSW 107 85 Yes Yes 668 Preventative - FSW 114 82 Yes Yes 668 Preventative - FSW 109 85 Yes Yes 668 Preventative - FSW 116 82 Yes Yes 668 Preventative - FSW Ill 85 Yes Yes 668 Preventative - FSW 118 82 Yes Yes 668 Preventative - FSW 113 85 Yes Yes 668 Preventative - FSW 120 82 Yes Yes 668 Preventative - FSW 115 85 Yes Yes 668 Preventative - FSW 122 82 Yes Yes 668 Preventative - FSW 117 85 Yes Yes 668 Preventative - FSW 89 83 Yes Yes 668 Wear at 6 Continuous AVBs 119 85 Yes Yes 668 Preventative - FSW 91 83 Yes Yes 668 Preventative - FSW 121 85 Yes Yes 668 Preventative - FSW 93 83 Yes Yes 668 Preventative - FSW 127 85 Yes Yes 668 Preventative - FSW 95 83 Yes Yes 668 Preventative - FSW 88 86 Yes Yes 668 Preventative - FSW 97 83 Yes Yes 668 Preventative - FSW 92 86 Yes Yes 668 Preventative - FSW 99 83 Yes Yes 668 Preventative - FSW 94 86 Yes Yes 668 Preventative - FSW 101 83 Yes Yes 668 Preventative - FSW 96 86 Yes Yes 668 Preventative - FSW 103 83 Yes Yes 668 Preventative - FSW 98 86 Yes Yes 668 Preventative - FSW

.05 83 Yes Yes 668 Preventative - FSW 100 86 1 Yes I Yes 668 Preventative - FSW

-~-~-4-4 4 107 [.8 1YeI Yes 66 Preventative - FSW 102 86 1 Yes I Yes 668 Preventative - FSW 1814-AA086-M0238, REV. 0 Page 202 of 415

Page 202 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-4 (cont'd)

SG 2E089 Tube Plugging and Stabilization List U2 NECP 800873488 U2 NECP 800873488 RSG 2E-089 Tube Plugging & Stabilizing Map/List RSG 2E-089 Tube Plugging & Stabilizing Map/List Stab Stab Row Col Plug Stab Length Reason Row Col Plug Stab Length Reason 104 86 Yes Yes 668 Preventative - FSW 121 89 Yes Yes 668 Wear at 6 Continuous AVBs 106 86 Yes Yes 668 Preventative - FSW 131 89 Yes Yes 668 Preventative - FSW 108 86 Yes Yes 668 Preventative - FSW 100 90 Yes Yes 668 Preventative - FSW 110 86 Yes Yes 668 Preventative - FSW 102 90 Yes Yes 668 Preventative - FSW 112 86 Yes Yes 668 Preventative - FSW 104 90 Yes Yes 668 Preventative - FSW 114 86 Yes Yes 668 Preventative - FSW 106 90 Yes Yes 668 Preventative - FSW 116 86 Yes Yes 668 Preventative - FSW 108 90 Yes Yes 668 Preventative - FSW 118 86 Yes Yes 668 Preventative - FSW 110 90 Yes Yes 668 Preventative - FSW 122 86 Yes Yes 668 Preventative - FSW 112 90 Yes Yes 668 Preventative - FSW 130 86 Yes Yes 668 Preventative - FSW 114 90 Yes Yes 668 Preventative - FSW 93 87 Yes Yes 668 Preventative - FSW 116 90 Yes Yes 668 Preventative - FSW 95 87 Yes Yes 668 Preventative - FSW 118 90 Yes Yes 668 Preventative - FSW 97 87 Yes Yes 668 Preventative - FSW 120 90 Yes Yes 668 Wear at 6 Continuous AVBs 99 87 Yes Yes 668 Preventative - FSW 130 90 Yes Yes 668 Preventative - FSW 101 87 Yes Yes 668 Preventative - FSW 132 90 Yes Yes 668 Preventative - FSW 103 87 Yes Yes 668 Preventative - FSW 134 90 Yes Yes 668 Preventative - FSW 105 87 Yes Yes 668 Preventative - FSW 99 91 Yes Yes 668 Preventative - FSW 107 87 Yes Yes 668 Preventative - FSW 105 91 Yes Yes 668 Preventative - FSW 109 87 Yes Yes 668 Preventative - FSW 107 91 Yes Yes 668 Preventative - FSW 111 87 Yes Yes 668 Preventative - FSW 109 91 Yes Yes 668 Preventative - FSW 113 87 Yes Yes 668 Preventative - FSW 113 91 Yes Yes 668 Preventative - FSW 115 87 Yes Yes 668 Preventative - FSW 115 91 Yes Yes 668 Preventative - FSW 117 87 Yes Yes 668 Preventative - FSW 117 91 Yes Yes 668 Preventative - FSW 119 87 Yes Yes 668 Preventative - FSW 123 91 Yes Yes 668 Preventative - FSW 129 87 Yes Yes 668 Preventative - FSW 98 92 Yes Yes 668 Preventative - FSW 94 88 Yes Yes 668 Preventative - FSW 104 92 Yes Yes 668 Preventative - FSW 96 88 Yes Yes 668 Preventative - FSW 108 92 Yes Yes 668 Preventative - FSW 98 88 Yes Yes 668 Preventative - FSW 114 92 Yes Yes 668 Preventative - FSW 100 88 Yes Yes 668 Preventative - FSW 116 92 Yes Yes 668 Preventative - FSW 102 88 Yes Yes 668 Preventative - FSW 103 93 Yes Yes 668 Preventative - FSW 104 88 Yes Yes 668 Preventative - FSW 115 93 Yes Yes 668 Preventative - FSW 106 88 Yes Yes 668 Preventative - FSW 102 94 Yes Yes 668 Preventative - FSW 108 88 Yes Yes 668 Preventative - FSW 114 94 Yes Yes 668 Preventative - FSW 110 88 Yes Yes 668 Preventative - FSW 116 94 Yes Yes 668 Preventative - FSW 112 88 Yes Yes 668 Preventative - FSW 103 95 Yes Yes 668 Preventative - FSW 114 88 Yes Yes 668 Preventative - FSW 105 95 Yes Yes 668 Preventative - FSW 116 88 Yes Yes 668 Preventative - FSW 107 95 Yes Yes 668 Preventative - FSW 118 88 Yes Yes 668 Preventative - FSW 109 95 Yes Yes 668 Preventative - FSW 138 88 Yes Yes 668 Preventative - FSW 115 95 Yes Yes 668 Preventative - FSW 95 89 Yes Yes 668 Preventative - FSW 109 97 Yes Yes 668 Preventative - FSW 97 89 Yes Yes 668 Preventative - FSW 110 98 Yes Yes 668 Preventative - FSW 99 89 Yes Yes 668 Preventative - FSW 112 98 Yes Yes 668 Preventative - FSW 101 89 Yes Yes 668 Preventative- FSW 130 122 Yes Yes 668 Preventative- Retainer Bar 103 89 Yes Yes 668 Preventative - FSW 132 122 Yes Yes 668 Preventative - Retainer Bar 105 89 Yes Yes 668 Preventative- FSW 127 127 Yes Yes 668 Preventative- Retainer Bar 107 89 Yes Yes 668 Preventative - FSW 120 132 Yes Yes 668 35% 5 TWD 109 89 Yes Yes 668 Preventative- FSW 119 133 Yes Yes 668 35%_sTWD 111 89 Yes Yes 668 Preventative - FSW 121 133 Yes Yes 668 Preventative - Retainer Bar 113 89 Yes Yes 668 Preventative- FSW 109 143 Yes Yes 668 Preventative - Retainer Bar 115 89 Yes Yes 668 Preventative- FSW 110 144 Yes Yes 668 Preventative- RetainerBar 117 89 Yes Yes 668 Preventative- FSW 1 1814-AA086-M0238, REV. 0 Page 203 of 415

Page 203 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Table 5-5 Summary of TSP Wear Review Number Relative Land Edge Length of Shape of with with Deepest of o

SG Row Col Locn Lands wt ih Deet with Deepest Deepest Wear Deepest With Wear Wear (to TSP Wear Wear thickness) 2E088 109 79 07H 1 0 Bottom 1/4 Flat 2E088 113 81 07H 1 0 Bottom 1/4 Flat 2E089 131 57 07H 2 Flank Top 3/4 Tapered 2E089 112 82 07C 2 0 Bottom 1/2 Tapered 2E089 112 84 07C 1 0 Bottom 1/2 Tapered 2E089 90 84 07H 2 0 Bottom 1/2 Tapered 2E089 109 85 07H 3 Flank Middle 1/2 Flat 2E089 117 87 07H 1 0 Bottom 1/4 Tapered 2E089 95 91 07H 2 0 Bottom 1/2 Tapered 3E088 112 74 07C 2 0 Bottom 1/2 Tapered 3E088 112 74 07H 2 0 Bottom 1/4 Tapered 3E088 102 76 07H 3 0 Bottom 3/4 Tapered 3E088 100 78 07C 3 0 Bottom 1.0 Tapered 3E088 100 78 07H 3 0 Bottom 1.0 Tapered 3E088 106 78 07C 3 Flank Bottom 1.0 Tapered 3E088 106 78 07H 3 0 Bottom 1.0 Tapered 3E088 120 78 07C 2 0 Bottom 1.0 Tapered 3E088 120 78 07H 3 0 Bottom 1.0 Tapered 3E088 93 85 07C 3 0 Top 1.0 Flat 3E088 93 85 07H 3 0 Bottom 1.0 Tapered 3E088 109 85 07H 2 0 Bottom 1/2 Tapered 3E088 103 89 07C 2 Flank Top 1/2 Tapered 3E088 103 89 07H 2 Flank Middle 1/4 Tapered 3E088 95 85 07H 1 0 Bottom 1/2 Tapered 3E088 93 75 07H 1 0 Bottom 1/4 Tapered 1814-AA086-M0238, REV. 0 Page 204 of 415

0O Page 204 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment 0, February 15, 2013 CO Number of AVB Sites with Wear in Unit 3 SVI Tubes 00 (Unit 2 Tubes at Same Locations Used for Comparison) co) Frequency 3-88 E Frequency 3-89 E Frequency 2-88 ý Frequency 2-89 0)

-in- Cumulative % 3 B - Cumulative % 3 e - Cumulative % 2 Cumulative % 2-89

.9 m

X 50 1 45 0.9 40 0.8 35 0.7 30 0.66 0 2 0.5 M 0.4 '

15 0.3 10 0.2 5

0.1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 Bin: Number of AVB Wear Sites Figure 5-1 Number of AVB Wear Sites per Tube for the Freespan Wear Region of Interest: All SGs

Page 205 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 SG2-89 Tube-to-Tube Proximity using January 2012 Data

-BaseTubes

• Stayrods

• B01,802 PRX A 803, B04 PRX BO5,806 PRX 0807,808 PRX A B09,B10 PRX c B1l, 812 PRX 0 20%TW or greater

• AVBDent 150 140 130 120 110 100 90 80

-i 0 70 60 50 40 30 20 10 0

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 Column Figure 5-2 SG 2E089 Tube-to-Tube Proximity Map Based on 2012 Eddy Current Data Re-analysis

Page 206 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 0

00 SGZ..89 Tube-to-Tube Proximity >1V using January 2C12 Data

• BaseTAbes 014ot Leg #ColdLeg *Stayrods o20%TWo,-Greater 0 150 90 140 C) oo 120  :* :!!!*R -* ::: :: ::.... .. . . . . .

M ~ 130 . .. . ... . . . . . ------

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.......... ..... olt. roxim...Rport

Co Page 207 of 414 LTR-SGDA-1 2-36, Rev. 3 NP-Attachment February 15, 2013 0

02 SG2-88 Tube-to-Tube Proximity using January 2012 Data

-Base Tubes 0 Hot Leg PRX A Cold Leg PRX0 20%TW and Greater* AV8 Dent 150 X

M 00 140 OD 130 A A::::~:: .......  :::.. ...........

120 .... AA 110

.-.:.-.:.--..:D

.......................... * ::*::* _* D::*::*: ::::.:.::.:.::: ......-- .:::: .:::.:

100 ..................

90 . . .. . .. . .. . . . .. .. . . . . . . . . .**** * ** ** ***** * **

• • • • • • • • • • • • • • • • -******* ....... ****° ...

80 . . . . . . . . . . . . . . .. . .. .. .. ... . .. .. .. .. . .. .. .. .. .. . .. .. .. .. .. .. .. .. .. .. .. . .. .. .. .. .. .. .. .. .. .. .. . .. .. .. . ... . .. .. .. .. .. .. .. . .. .. .. .. .. ..

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0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 Column Figure 5-4 SG 2E088 Tube-to-Tube Proximity Map Based on 2012 Eddy Current Data Re-analysis

Page 208 of 414 co LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 00 00 0

Figure 5-5 Field Proximity Signal Using +Pt

Page 209 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15. 2013 Figure 5-6

+Pt Multi-Frequency Response for Suspected Freespan Wear on SG 2E089 Rl13 C81

-. x, Oo Page 210 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 0,

0) 0)

CA) mI Figure 5-7

+Pt Terrain Plot for Suspected Freespan Wear on SG 2E089 RI 11 C81

Page 211 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 i 4-Figure 5-8 Multi-Frequency +Pt Response for AVB Wear Extension on SG 3E088 R107 C75

-.O 00 Page 212 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 0,

.90 m

0 Figure 5-9

+Pt Full Scan Line Lissajous Plot and Terrain Plot for SG 3E088 R107 C75

0, Page 213 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 0) 00 0) 90 Figure 5-10

+Pt Terrain Plot for SG 3E088 R107 C75

0)L Page 214 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 00 0,

CA) m

U m

C) 90 Figure 5-11 Non-Typical +Pt Response on R107 C75 SG 3E088

Page 215 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 5-12

+Pt Multi-Frequency Plot for Laboratory Simulation of Freespan Wear (12%TW)

Page 216 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 5-13

+Pt Terrain Plot for Laboratory Simulation of Freespan Wear (12%TW)

Page 217 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 5-14 Pancake Coil Response for Laboratory Simulation of Freespan Wear (12%TW)

Page 218 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 a,b,c Figure 5-15 Pancake Coil Multi-Frequency Response for Laboratory Simulation of Freespan Wear (12%TW)

LPage 219 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013

0) JSUMEN !N1W VIE UO,,,LY5I5 0U6=09 JtsKjAilk PILt CS III t no I PM IMM OD Jam,MI IlII 1j"IItF t I: I Figure 5-16 Bobbin Coil 300 and 150 kHz Absolute (Ch4 and Ch6) Response for Laboratory Simulation of Freespan Wear

-3 Page 220 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment 00 February 15, 2013 0)

0 O0 m

Figure 5-17 Bobbin Coil Response for SG 2E089 RI II C81

Page 221 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 SG 3E088 Reviewed Tube Locations Tubes a +Pt Reviewed Tube 0 Freespan Wear Tube 145 135 S

0 00 115 . -" . _ "

00 0

, ". ". " . o@oQ "..

• ~ 0 65 70 75 80 85 90 95 100 Column Figure 5-18 Plot of SG 3E088 Locations for which +Pt Data Review was Conducted

Page 222 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 WVI 30%TW 0 /

/

a 5 8 9

3 10 Li 2 00 60 0

0 0

0 0 0*00 o~og 60 0 0 11\

1 O* n0 0 00 00

~ogO 00 0 12 0 0 0 0 00 60 00 Q 0*00 0 0 0

0 0 000 09 0 0 00 0G0 U3 SG-88 Row: 98 Column: 78 Figure 5-19 Sample of Tube Motion Plot

Page 223 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 Figure 5-20

+Pt Terrain Plot of R93 C85 TSP 07H Bottom

-.1 Page 224 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 C) 0o'r W I 1A 1 ; ' 1-1 ,14 m

Figure 5-21

+Pt Terrain Plot of R93 C85 TSP 07H Top

Page 225 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment

-A February 15, 2013 C) o0 0

m 0

Figure 5-22

+Pt Terrain Plot of R93 C85 TSP 07H Vertical Offset between Wear Edge and TSP Edge

0, 00 Page 226 of 414 LTR-SGDA-12-36, Rev. 3 NP-Attachment February 15, 2013 4%

0 SVI 20%TW SVI 46%TW m 6 7 0 8 5

4 9 3 10

. T,,I- Dw 0 A.- I,&

2 11 II, 0

0 1 0 12 I

c4WM U3 SG-88 Row: 93 Column: 85 Figure 5-23 Motion Plot of R93 C85