Text

Calculation 32-9049387-000, North Anna Units 1 & 2, Pressurizer Surge Nozzle Weld Overlay Analysis
	ML071410328
Person / Time
Site:	North Anna
Issue date:	04/30/2007
From:	Sorensen T, Straka T; AREVA NP
To:	; Office of Nuclear Reactor Regulation
References
	32-9049387-000
	Download: ML071410328 (162)
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20697-10 (3/30/06*

ACALCULATION

SUMMARY

SHEET (CSS)

AREVA 1

1.

Document Identifier 32 - 9049387 - 000 Title North Anna Units 1&2, Pressurizer Surge Nozzle Weld Overlay Analysis PREPARED BY:

REVIEWED BY:

METHOD: Z DETAILED CHECK El INDEPENDENT CALCULATION NAME Todd Sorensen NAME Tomas Straka SIGNATURE Eie D/

SIGNATURE 7

TITLE Engineer I DATE TITLE Principal Engineer DATE COST REF.

TM STATEMENT:

CENTER 41324 PAGE(S) 110 REVIEWER INDEPENDENCE Basel Djazmati NAME PURPOSE AND

SUMMARY

OF RESULTS:

Purpose:

This document is a non-proprietary version of AREVA NP Document 32-9038239-000. The proprietary information removed from 32-9038239-000 is indicated by a pair of square brackets "(

)." The geometry and operating condition are Dominion Power proprietary. The purpose of this calculation is to qualify the North Anna Units 1 & 2 Pressurizer Surge Nozzle Weld Overlay Design to the requirements specified in Reference 13.7.

==

Conclusion:==

The calculations demonstrate that the design of the Surge Nozzle Weld Overlay for the North Anna Units 1 & 2 Pressurizer has met the stress and fatigue requirements of the Design Code (Reference 13.1).

Based on the loads and cycles specified in References 13.8 and 13.16, the conservative fatigue analysis indicates that the Pressurizer Surge Nozzle has a maximum fatigue usage factor of (

) (Reference 13.7) compared to the ASME Code allowed maximum value of 1.0.

THE DOCUMENT CONTAINS ASSUMPTIONS THAT MUST BE VERIFIED PRIOR TO USE ON THE FOLLOWING COMPUTER CODES HAVE BEEN USED IN THIS DOCUMENT:

SAFETY-RELATED WORK CODENERSION/REV CODENERSION/REV D YES M

NO AREVA NP Inc., an AREVA and Siemens company Page I of 162

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA DOCUE NUMBNON-PROPRETARY 1

1 32-9049387-000 Noith Anna Units I & 2 N

RY RECORD OF REVISIONS Revision Number Description Date 000 Oiiginal Release 04/2007 Prepared by:

T. Sorensen Reviewed by: 1. Straka Date: 04/2007 Date: 04/2007 Page 2

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS "A R E VA DOCU)Am NUMBER.*

S 3290937-0 NoMBth PIANna Unt&

NON-PROPRIETARY 132-9049387-000 Noith Anna Units 1 & 21 TABLE OF CONTENTS RECORD OF REVISIONS.....................................

2 LIST OF TABLES.....................................................................

5 LIST OF FIGURES.......................................................................................................................

9 LIST OF FIGURE S.......................................................................................................................

9

1. PURPOSE............

11 2 1..1 INIRODUCIION G......................

11

2. ANALYTICAL METHODOLOGY.....................................................................................

12

3. KEY ASSUMIPTIONS...........................................................................................................

13

4. DESIGN INPUT.....................................................................................................................

14 4.1 GEOMETRY..

14 4.2 FINITE ELEMENT MODEL 15 4.3 MATERIALS 19 4.4 BOUNDARY CONDITIONS AND LOADS........................20 4.4 1 Thermal analysis 20 4.4.2 Stuctuial Analysis.......................................

20

5. EXTERNAL LOADS.............................................................................................................

22 5.1 NOZZLE CROSS SECTION CHARACTERISTICS......24 5.2 APPLICABLE STRESS INTENSITY DUE TO EXTERNAL LOADS FOR PRIMARY + SECONDARY QUALIFICATION.............

16

6. DESIGN CONDITION.........................................................................................................

39

7. THERMAL ANALYSIS...............................................

43

8. STRUCTURAL ANALYSIS.................................................................................................

70

9. ASMIE CODE CRITERIA....................................................................................................

71 9.1 ASME CODE PRIMARY STRESS INTENSITY (SI) CRITERIA

.......... 71 9.,2 ASME CODE PRIMARY+SECONDARY STRESS INTENSITY (SI) CRITERIA72 9..2.1 Path Stress Evaluation......

72 9..2.2 Primary + Secondary Stress Intensity Range Qualification (NB 3222-2)..............76 9.2 2.1 Summary of Stress Intensity Range Qualification 87 92..3 Simplified Elastic-Plastic Analysis (NB-3228,5)..................

87 Prepared by:

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA Docuwm MBER PINT 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY 92.3 Simplified Elastic-Plastic Analysis (NB-3228.5).............

87 92..3.1 Primary + Secondary SI Range (Excluding theimal bending stiesses) (NB-3228.5(a))....................................................................................

87 9.2.3.2 Factor Ke (NB-3228.5(b))...........................

91 9.2.3.3 Fatigue Usage Factor (NB-322&5(c) and NB-3222.4).............

91 9.2.3.4 Theimal Stress Ratchet (NB-3228 5(d) and NB-3222.5).............

91 9.2.3.5 Temperature Limits (NB-3228.5(e))........

................... 96 9.2.3..6 Minimum Strength Ratio (NB-3228 5(f)).......................

97 9.2..4 Fatigue Usage Factor Calculation..

98

10. RESULTS

SUMMARY

/CONCLUSION...........................................................................

107

11. SOFTWARE VERIFICATION.........................

108

12. COMPUTER OUTPUT FILES..........................................................................................

109

13. RE FERENCES....................................................................................................................

110 APPENDIX A PATH STRESSES FOR FRACTURE MECHANICS...........................................................

ill APPENDIX B STRUCTURAL TIME POINTS OF INTEREST...................................

118 APPENDIX C JUSTIFICATION OF INSUFFECIENT LENGTH OF WELD OVERLAY...................... 159 Prepared by:

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WEID OVERLAY A

ANALIYSIS A R E VA DOCUMEN NEJMB nk AREVANON-PROPRIETARY 32-9049387-000 North Anna Units I & 2 LIST OF TABLES Table 5-1 Applicable External Loads.....................................

22 Table 5-2 Applicable Loads Due to Thermal Stratification 23 Table 5-3 Nozzle Cross Sectional Characteristics (Maximum WOL).....

24 Table 5-4 Nozzle Cross Sectional Characteristics (Minimum WOL) 24 Table 5-5 Primary + Secondary SI Due to External Loads (Max WOL)...........

27 Table 5-6 Primary + Secondary SI Due to External Loads (Min WOL).

28 Table 5-7 Primary + Secondary SI Due to Thermal Stratification Load Case (

) (Max W O L)e 5 -8

..................................................................2 9 Table 5-8 Primary + Secondary SI Due to Thermal Stratification Load Case

)(M WOL)

.... 30 Table 5-9 Primary + Secondary SI Due to Thermal Stratification Load Case (

)(Mi WOL) 31 Table 5-10 Primary + Secondary SI Due to Thermal Stratification Load Case (

) (Maix Table 5-11 Primary + Secondary S1 Due to Thermal Stratification Load Case (

) (Max WOL)..................................................

33 Table 5-12 Primary + Secondary SI Due to Thermal Stratification Load Case (

) (Max W OL)..............................................................................................

34 Table 5-13 Primary + Secondary SI Due to Thermal Stratification Load Case

](Mi WOL) 35 Table 5-14 Primary + Secondary SI Due to Thermal Stratification Load Case (

(Min WOL).

36 Table 5-15 Primary + Secondary SI Due to Thermal Stratification Load Case (

) (Max Table 5-16 Primar y + Secondary SI Due to T hermal Strtiiation Load Cas (

[

(M WOL).

38 Table 7-1 Transients.......................

43 Table 7-2 Nodes of Interest for Evaluation of' Temperature Cradients................

46 Table 7-3 Temperature Gradients of Interest...

46 Table 9-1 Path Descriptions 73 Table 9-2 Summary of Maximum Primary + Secondary SI Ranges for Membrane + Bending Stresses (Maximum WOL).........................................77 Prepared by:

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ANALYSIS A R E VA DOCUMNI NUMBER PIANT 1 32-9049387-000 North Anna Units I & 2 N

RA Table 9-3 Comparison of'Maximum SI Range including External Loads to ASME Code 3*Sm Criteria (Maximum W L...~7 Table 9-4 External Stress Added by Components (Maximum WOL)............80 Table 9-5 Summary of'Maximum Primary + Secondary SI Ranges for Membrane + Bending Stresses (Minimum WOL).........................................82 Table 9-6 Comparison of Maximum SI Range including External Loads to ASME Code 3*Sm Criteria (Minimum WOL).

......................................... 83 Table 9-7 External Stress Added by Components (Minimum WOL)

....- 85 Table 9-8 Maximum WOL SI Ranges Minus Thermal Bending 88 Table 9-9 Minimum WOL SI Ranges Minus Thermal Bending.

...90 Table 9-10 Allowable Ranges of" hermal Stresses for-Maximum WOL...............92 Table 9-11 Allowable Ranges of Thermal Stresses for' Minimum WOL

....... 92 Table 9-12 Thermal M+B SI Range for Maximum WOL 93 Table 9-13 Thermal M+B SI Range for Minimum WOL 95 Table 9-14 Stress Category and FSRF in Fatigue Evaluation

... 98 Table 10-1 Summary of'Results 107 Table 11-1 Software Verification Files...................................

108 Table A-1 Paths Description Min WOL 112 Table B-1 Structural Time Points of Interest for Plant Heatup and Cooldown-MAX WOL.... 120 Table B-2 Structural Time Points ofInterest for Plant Loading and Unloading-MAX WOL.121 Table B-3 Structural Time Points ofInterest for 10% Step Load Increase-MAX WOL........... 122 Table B-4 Structural Time Points of Interest for 10% Step Load Decrease-MAX WOL....... 123 Table B-5 Structural Time Points of'Interest for Large Step Decrease In Load-MAX WOL.,124 Table B-6 Structural Time Points of Interest for Loss of Load-MAX WOL..........

... 125 Table B-7 Structural lime Points of Interest for Loss of Power-MAX WOL.....

126 Table B-8 Structural Time Points of'Interest for Loss of'Flow-MAX WOL

............ 127 Table B-9 Structural Time Points of Interest for Feedwatei Cycling at Hot Shutdown-MAX WOL..........................................128 Table B-10 Structural lime Points of Interest for' Boron Concentration Equalization-MAX WOL..............................................129 Table B-11 Structural Time Points of Interest for, Reactor Trip with No Cooldown-MAX WOL129 Table B-12 Structural Time Points of Interest for' Reactor Trip with Cooldown but no Safety Injection-MAX WOL........................................

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R EVA DOCU1MN WUMBM NON-PROPRIETAJRY 32-9049387-000 North Anna Units I & 2 Table B-13 Structural Time Points of Interest fox Reactor hrip with Cooldown and Safety Injection-MAX WOL...........................................130 Table B-14 Structural Time Points of Interest for Inadvertent Reactor Coolant System Depiessurization-MAX WOL......................................131 Table B-15 Structural Time Points of Interest fox Control Rod Drop-MAX WOL.......

132 Table B-16 Structural Time Points of'Interest for Inadvertent Startup of an Inactive Loop-MAX Table B-17 Structural Time Points of Interest for Inadvertent Safety Injection Actuation-MAX W OL.............................................................................................................. 134 Table B-18 Structural Time Points of Interest fox Turbine Roll Test-MAX WOL.

135 Table B-19 Structural Time Points of Interest fox Loop Out of Service Normal Loop Shutdown-MAX WOL 135 Table B-20 S'tuctural Time Points of Interest fox Loop Out of Service Normal Loop Startup-MAX WOL 6.......................

136 Table B-21 Structural Time Points of Interest for RCS Cold Overptessurization-MAX WOL137 Table B-22 Structural Time Points of'Interest fox Plant Heatup and Cooldown-MIN WOL... 138 Table B-23 Structural Time Points of Interest for Plant Loading and Unloading-MIN WOL.. 139 Table B-24 Stuctutal Time Points of Interest for 10% Step Load Increase-MIN WOL.........

1 40 Table B-25 Structural Time Points of Interest for 10% Step Load Decrease-MIN WOL 141 Table B-26 Structural Time Points of Interest for Large Step Decrease In Load-MIN WOL.142 Table B-27 Structural Time Points of Interest for Loss of Load-MIN WOL

....... 143 Table B-28 Structural Time Points of Interest for Loss of Powei-MIN WOL........

...144 Table B-29 Structural Time Points of'Interest for Loss of Flow-MIN WOL 145 Table B-30 Structural Time Points of Interest for Feedwater Cycling at Hot Shutdown-MIN WOL 146 Table B-31 Structural Time Points of Interest for Boron Concentration Equalization-MIN WOL......................................................

147 Table B-32 Structural Time Points of Interest for Reactor Trip with No Cooldown-MIN WOL148 Table B-33 Structural Time Points of Interest for Reactor Trip with Cooldown but no Safety Injection-MIN WOL 149 Table B-34 Structural Time Points of Interest for Reactor Trip with Cooldown and Safety Injection-MIN WOL 150 Table B-35 Structural Time Points of Interest for Inadvertent Reactor Coolant System Depressuization-MIN WOL

....................................... 151 Prepared by:

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ANALYSIS A R EVA DO.JM*N1 NumBE P1 AREV DOCMEM

&SakMM7NON-PROPRIETARY 1_

_ 32-9049387-000 North Anna Units I & 2 N RR Table B-36 Structural Time Points of Interest for Control Rod Drop-MIN WOL...-.......

152 Table B-37 Structural lime Points of Interest for Inadvertent Startup of an Inactive Loop-MIN WOL.......................................................

153 Table B-38 Structural lime Points of Interest for Inadvertent Safety Injection Actuation-MIN Table B-39 Structural lime Points of Interest for Turbine Roll Iest-MIN WOL........

155 Table B-40 Structural lime Points of Interest for' Loop Out of Service Normal Loop Shutdown-MIN WOL 156 Table B-41 Structural Time Points ofIntelest for' Loop Out of Service Normal Loop Startup-MIN WOL...............................

..... 157 Table B-42 Structural Time Points of'Interest for RCS Cold Overpressurization-MIN WOL..158 Prepared by:

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ANALYSIS AREVA DOCUNM PLANNON-PROPRETARY 32-9049387-000 North Anna Units I & 2 LIST OF FIGURES Figure 4-1 Surge Nozzle Geometry with Weld Overlay.......................

15 Figure 4-2 Finite Element Model of' Sutge Nozzle with Weld Overlay (Maximum WOL Shown) 16 Fligure 4-3 Finite Element Model - Detail View of' SWOL Region (Maximum Configuration Figure 4-4 Surfaces for Thermal Boundary Conditions 21 Figure 5-1 Path Definitions for External Loading 25 Figure 6-1 Deformed Shape versus Un-deformed Outline

........ 40 Figure 6-2 Stress Intensity Contours at Design Condition (Maximum WOL Shown)....

41 Figure 6-3 Stress Intensity Contous at Design Condition Boundaries (Maximum WOL Shown)42 Figure 7-1 Location of'Node Numbers for Evaluation of Temperature Gradients............

.... 48 Figure 7-2 Temperature and Temperature Gradients for Surge Plant Heatup/Cooldown Transients for Maximum WOL Configuration....................

......49 Figure 7-3 Temperature and Temperature Gradients for Surge Plant Loading/Unloading Transients for Maximum WOL Configuration....................

..... 50 Figure 7-4 Temperature and Temperature Gradients for Surge 10% Step Load Increase Transient for Maximum WOL Configuration............................

51 Figure '7-5 Temperature and Temperature Gradients for Surge 10% Step Load Decrease Transient for-Maximum WOL Configuration.........................

....52 Figure 7-6 Temperature and Temperatute Gradients for Surge Large Step Decrease in Load for Maximum WOL Configuration...................................

...53 Figure 7-7 Temperature and Temperature Gradients for Surge Loss of'Load for Maximum WOL Configuration...............................

54 Figure 7-8 Temperature and Temperature Gradients for Stage Loss of'Power Transient for Maximum WOL Configuration......................................

55 Figure 7-9 Temperature and Temperature Gradients for Surge Loss of Flow Transient for Maximum WOL Configuration 56 Figure 7-10 rempetature and Temperature Gradients for Surge Feedwater Cycling at Hot Shutdown Transient foi-Maximum WOL Configuration...............

.57 Figure 7-11 Temperature and Temperature Gradients for Surge Boron Concentration Equalization Transient for Maximum WOL Configuration.......

58 Figure 7-12 Temperature and Temperature Gradients for Surge Reactor Trip with No Cooldown Transient for Maximum WOL Configuration 59 Prepared by:

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ANALYSIS A R EVA DOCUMdENI NUMBER nAN[

1 32-9049387-000 North Anna Units 1 & 2 N

RY Figure 7-13 Temperature and Temperature Gradients for Surge Reactor Trip with Cooldown but no Safety Injection Transient for Maximum WOL Configuration................60 Figure 7-14 Temperature and Temperature Gradients for Surge Reactor Trip with Cooldown and Safety Injection Transient for Maximum WOL Configuration.

61 Figure 7-15 Temperatute and Temperature Gradients for Surge Inadvertent Reactor Coolant System Depressurization hiansient for Maximum WOL Configuration........

62 Figure 7-16 Temperature and Temperature Gradients for Surge Control Rod Drop Transient for Maximum WOL Configuration......................................

63 Figure 7-17 Tempetature and Temperature Gradients for Surge Inadvertent Startup of an Inactive Loop ITansient for' Maximum WOL Configuration

...... 64 Figure 7-18 Temperature and Temperature Gradients for Surge Inadvertent Safety Injection Actuation Transient for Maximum WOL Configuration..

65 Figure 7-19 Tempeiature and Temperature Gradients for' Surge Turbine Roll Test Transient for Maximum WOL Confguation...............................66 Figure 7-20 Temperature and Temperature Gradients fox Surge Loop Out of Service Normal Loop Shutdown Transient for Maximum WOL Configuation..................67 Figure 7-21 Temperature and Temperature Gradients for Surge Loop Out of Service Normal Loop Startup Transient for Maximum WOL Configuration....................68 Figure 7-22 Temperature and Temperature Gradients for Surge RCS Cold Overptessutization for Maximum WOL Configuration...............................

69 Figure 9-1 Path Locations in SWOL Region used for-Stress Evaluation......

..74 Figure 9-2 Path Locations in Nozzle used for Stress Evaluation....................

75 Figure A-1 Paths Defined for Fracture Mechanics Evaluation 113 Figure C-1 Stress Intensity Contour for the Thin Weld Overlay Configuration

.162 Prepared by:

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1.

PURPOSE

1.1 INTRODUCTION

Primary water stress corrosion cracking (PWSCC) of Alloy 82/182 materials is a well-documented phenomenon in the nuclear power.. High temperature components, such as those associated with the pressurizer, have risk for PWSCC.. Dominion Generation (Dominion) plans to mitigate the North Anna Units 1 and 2 pressurizer nozzle Alloy 82/182 dissimilar metal welds (DMW) with full structural weld overlays (SWOL) dining the fall 2007 and spring 2007 refueling outages for Units 1 and 2, respectively. The planned mitigation using SWOL is a preemptive measure to reduce susceptibility of'the DMW and the adjacent pipe/fitting to safe end welds to PWSCC.

1.2 SCOPE The surge nozzle is located on the bottom of the pressurizer as a conduit for the surge line insuiges and outsurges. The weld overlay is designed to covet both the Alloy 82/182 DM region and the austenitic stainless weld between the nozzle safe end and the piping. Application of weld overlays alters the local stress distribution. A detailed finite element analysis (FEA) is therefore conducted to investigate stress conditions under various operational transients. The results are summarized in this report to certify that criteria per ASME Code Section III for Class I components, Reference 13.1, are satisfied for the surge nozzle with weld overlays..

The analysis is focused on the overlaid region for requirements on both stress distribution and fatigue failure criterion.. The main scope of the analysis includes the singe line piping, the stainless steel weld between the safe end and the piping, the safe end, the DM weld between the safe end and the nozzle, the surge nozzle, SWOL, and the pressurizer lower head.. In addition, post-processing of thermal and structural results is performed to provide data for fracture analysis of the surge nozzle (see Appendix A).

It should be noted that the original nozzle configuration without the Weld Overlay is not analyzed in this calculation. The application of the SWOL will increase the secondary stress due to thermal gradients and added discontinuities at the SWOL to Pipe, and SWOL to Nozzle junctures. The cumulative fatigue usage factors calculated in this document assume the Surge Nozzle SWOL has been in place since the plant conception. Therefore, the usage factors calculated will be higher than the actual usage factors based on summing Surge Nozzle's usage prior to SWOL and usage with the SWOL.

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ANALYSIS A R EVA AREV DOCMM Nb~mtMAMNON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2

2.

ANALYTICAL METHODOLOGY The general methodology of model development and stress analysis consists of:

1) Building a two-dimensional axisymmetric model of the Pressurizei Sunge Nozzle. The model incorporates the geometry (of the adjacent lowet head, nozzle, safe end, welds, weld overlay, and piping), appropriate materials, and boundary conditions. The 2-D Solid model is conveited into a 2-D finite element model. There are two finite element models consisting of thermal and stuctutal elements, respectively, to enable the thermal and structural analysis.,

2) Applying the design conditions of pressure and temperature (as temperature affects the material pioperties only) to the structural finite element model and obtaining the deformation and stresses in the model. The deformation field is used to verify the cotrect behavior of the model and correct modeling of boundary and load conditions.

3) Applying the thermal loads resulting fiom the plant operating transients (in the form of' transient tempeiatures and corresponding heat transfer coefficients versus time). Evaluating the results of the thermal analysis by examining the magnitude of temperature differences between key locations of the model. The time points of the maximum temperature gradient are those at which the maximum thermal stresses develop.

4) Applying the corresponding pressure and thermal loads (nodal temperature) at each time point identified in step 3 and other time points of analytical interest on the structural finite element model and obtaining the stress results.

5) Hand calculating the effects due to nozzle external loads and adding the resulting stresses to the stress results due to pressure and temperature effect.

6) 7)

Comparing the results to the ASME Code for acceptability.

Documenting stresses and temperatures for the fracture mechanics analysis of the surge nozzle weld overlay design.

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ANALYSIS AREVA CUMENU PNON-PROPRETARY 32-9049387-000 North Anna Units 1 & 2 N

3.

KEY ASSUMPTIONS Ihere are no majox assumptions for this calculation.. Minor assumptions are noted where applicable.

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ANALYSIS AREVA DOCUNUERNON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2

4.

DESIGN INPUT 4.1 GEOMETRY Major parts of the Surge Nozzle Weld Overlay ate shown in Figure 4-1. The detailed dimensions of the surge nozzle design are shown in References 13.5 and 13.6 as noted..

Pressurizer Lower Head Inside Radius to Base Metal

=

Pressurizer Lower Head Base Metal Thickness Pressurizer Lower Head and Nozzle Cladding Thickness

=

Pipe ID Pipe OD Safe End Top OD Safe End Top ID Iheimal Sleeve Weld ID Thermal Sleeve lID Thermal Sleeve OD Surge Nozzle ID Surge Nozzle OD at Weld Nozzle OD (neat head)

Nozzle OD (at nozzle to head weld)

Max Weld Overlay Length Max Weld Overlay Thickness (at nozzle side)

Min Weld Overlay Length Min Weld Overlay Thickness (at nozzle side)

The model shown in Figure 4-1 simulates, in two-dimensional space, the surge nozzle, surge nozzle safe end, and part of adjacent pressurizer vessel closure head. Since the surge nozzle is radial with respect to the spherical head, an axisymmetric model is used. The modeled portion of pressurizer head extends to 30 degrees fiom the axis of symmetry. This is considered sufficient for the stresses and thermal gradients to attenuate..

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[ANALYSIS AR EVA DUEN NUMB PLANTNON-PROPRIETARY 1 1 32-9049387-000 North Anna Units 1 & 2 N

r Figure 4-1 Surge Nozzle Geometry with Weld Overlay 4.2 FINITE ELEMENT MODEL The finite element analysis in this document is performed using ANSYS 10.0 (Reference 13.10).

The model was developed in ANSYSWORKBENCH 10.0 and is shown in Figure 4-1 through Figue 4-3. The output files documenting the Nozzle geometry awe listed in Section 12.. The element type chosen is the structural element PLANE183 (2-D 8-Node Structural Solid). This element.type is converted to element PLANE77 (2-D 8-Node Thermal Solid) for the thermal analysis..

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ANALYSIS AR EVA DOCUMM NUMER

PLM, 32-9049387-000 Noith Anna Units I & 2 NON-PROPRIETARY r

Figure 4-2 Finite Element Model of Surge Nozzle with Weld Overlay (Maximum WOL Shown)

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ANALYSIS AREVA PLANON-PROPRETARY 1__

132-9049387-000 North Anna Units 1 & 2 N

R E

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ANALYSIS A R E VA

ue

~

AUna UnNts I & 2 NON-PROPRIETARY 1

132-9049387-000 North Anna Units I & 2 Figure 4-3 Finite Element Model - Detail View of SWOL Region (Maximum Configuration Shown)

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ANALYSIS AR EVA M. NUMEt KAM 32-9049387-000 NothAnna Units

&2 4.3 MATERIALS Reference 13.7 provides the component material designations of'various components:

Pressurizer Lower Head r

Surge Nozzle Nozzle to Upper Head Weld Safe End Nozzle to Safe End Weld Buttering Weld Thermal Sleeve Pipe Safe End to Pipe Weld Head Internal Cladding Weld Overlay 2

The analysis herein uses the thermal properties - mean coefficient of' theimal expansion (a),

specific heat (C), thermal conductivity (k), and the mechanical properties - modulus of' elasticity (E), Poisson's ratio (gi), density (p). The pertinent properties (thermal & structural) for these materials ate listed in Reference 13.15..

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NORTH ANNA UNIT'S 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA DUMENI NUMBERNON-PROPRIETARY 32-9049387-000 North Anna Units I & 2 4.4 BOUNDARY CONDITIONS AND LOADS 4.4.1 Thermal analysis During operation, the inside surfaces ofthe Presstuizer and the inside bore surfaces of'the Surge Line Nozzle are in contact with the reactor coolant., Appropriate heat transfer coefficients and bulk temperatures versus time for each region shown in Figure 4-4 are applied on these surfaces.

The reactor coolant temperature varies with time depending upon the service load condition that is being applied and has been defined thoroughly in Reference 13.16.

The outside surface of pressurizer head and surge nozzle is exposed to the ambient temperature in conjunction with a small HTC. An ambient temperature of 70'F is conservatively used for all time points in the thermal analysis. Reference 13.16 specifies that a small HIC of' 4.4.2 Structural Analysis Pressure is applied to all exposed interior surfaces of' the Pressmizet Lower-Head and Nozzle.

The exterior-surfaces ofI the Pressurizer Lower Head and Nozzle are not loaded by pressure. End Cap pressure is applied to the upper end of the Piping to represent the hydrostatic end load from the piping closure.

End Cap Pressure is calculated by multiplying Piessurizer Pressmue by the quantity 2

D2 _d2 Where:

d = ID of the piping D = OD of the piping The boundary conditions for the structural analysis awe set to have zero displacement in the chicumferential direction (from the nozzle axis) and at the plane of symmetry..

Coupling is not used in the structural analysis between the Safe End and Thermal Sleeve in the Ihermal Sleeve Weld vicinity.. Internal pressure as discussed in Section 8, is applied to either side of the interface.

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ANALYSIS AR EVA DOCUMENT NUMBER PlAN!

1 1 32-9049387-000 North Anna Units 1 & 2 N

RY Figure 4-4 Surfaces for Thermal Boundary Conditions Prepared by:

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NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA

~MB NUMER PLA AREV DOMN1 NUMERnANTNON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2

5.

EXTERNAL LOADS Per Reference 13.16, the external forces and moments acting on the Surge Nozzle Safe End Weld location (Figure 5-1) ate listed in Table 5-1 Table 5-2 lists the external loads due to Iheimal Stratification only per Reference 13.8. These loads axe defined in the local coordinate system with the "y" axis oziented along the nozzle axis of' symmetry in the nozzle to pipe direction.

Table 5-1 Applicable External Loads Note "': DW loads are not included in the tabulated values since this calculation is for the P+Q evaluation of the stress intensity range. Deadweight loads act at all time points of all transients, and therefore do not contribute to the stress intensity ranges. Hence their omission is approptiate Note (2): Shear is calculated as the SRSS of'Fx and Fz, Note (3): Bending is calculated as the SRSS of Mx and Mz These loads are evaluated using hand calculation and the stiesses due to these loads are added to the ANSYS iesults where appropfiate for ASME evaluation Prepared by:

T. Sorensen Reviewed by: I. Stmaka Date: 04/2007 Date: 04/2007 Page 22

Table 6-2 Applicable Loads Due to Thermal Stratification IThermal t 1 tIIf t

Fz (

)M I Mix Mb Load Plant Unit (Axial)

Fi Fz (Shear)*21 (Torsional)

Mx Mz (Bending)(3)

CasesO')

I lbs lbs lbs Ibs in-lbs in-lbs in-lbs in-lbs K

K

~2 Note (1): Pet Reference 13 8 Note (2): Shear is calculated as the SRSS of Fx and Fz.

Note (): Bending is calculated as the SRSS of Mx and Mz Piepared by:

T. Sorensen Reviewed by: 1. Straka Date: 04/2007 Date: 04/2007 Page 23

NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA DOCUMNINUMBER.

KANT N

1 32-9049387-000 North Anna Units I & 2 5.1 NOZZLE CROSS SECTION CHARACTERISTICS The nozzle geometric dimensions ate specified in References 13 5 and 13.6. Based on these dimensions, the cross sectional characteristics (Table 5-3 and Table 5-4) are calculated for the locations depicted in Figure 5-1.

Table 5-3 Nozzle Cross Sectional Characteristics (Maximum WOL)

PathD d

I SOD SID A

L PtNae,[in]

[in]

[id4]

[in3]

[0n1

[in2]

[in]

PipeL P Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol Noz Note "): For path lines Pipel and PWol, the stress intensity due to axial bending stress from external shear forces would reduce the stress intensity due to transient loads. Therefore, the vertical distances from path line SEUWeld to Pipel and PWol are conservatively reduced to zero.

Table 5-4 Nozzle Cross Sectional Characteristics (Minimum WOL)

D d

I SOD SID A

L e

[in]

[in in4]

[in3]

[in2]

[in]_

PipeL-P Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol I Noz Note "': For path lines PipeL and PWol, the stress intensity due to axial bending stress from external shear forces would reduce the stress intensity due to transient loads. Therefore, the vertical distances from path line SEUWeld to PipeL and PWol are conseivatively reduced to zero.

Prepared by:

T. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 24

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA DM NJ*R PAOR 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Where:

D d

I = ;r(D4 - d4)

I SoD =--

I 4

L

- outside diameter

- inside diameter

- moment of'inertia

- section modulus of'the nozzle - outside diameter

- section modulus of'the nozzle - inside diameter

- cross-section area of the nozzle

- moment aim Figure 5-1 Path Definitions for External Loading Prepared by:

T.. Sorensen Reviewed by: I.. Straka Date: 04/2007 Date: 04/2007 Page 25

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA DUME ANON-PROPRIETARY 1 32-9049387-000 North Anna Units I & 2 N

RY 5.2 APPLICABLE STRESS INTENSITY DUE TO EXTERNAL LOADS FOR PRIMARY + SECONDARY QUALIFICATION The Surge Nozzle Weld Overlay is exposed to the external loads. The total stress intensities applicable fox primary + secondary qualification due to these loads are calculated here.

The membrane stress due to internal pressure is not considered here, since this is aheady included in the ANSYS transient run. Thus only OBE and thermal operating external loads (T-)

ate applicable for calculation in this section-The membrane + bending stress intensities due to external loads fiom Table 5-1 and due to thermal stratification only fiorm Table 5-2 are calculated as follows:

_ F A

O '

x BM M-F,

- A M2 2

-2*S

- axial membrane stress due to external axial force (Fy)

- axial bending stress due to external bending moment (Mb)

- axial bending stress due to external shear force (FS)

- shear-stress due to external shear force (F.)

- shear stress due to external torsion moment (Mt)

Sint =

0 aM8

+4.r.

where:

- membrane + bending stress intensity range o_

=

+ o-:,_

+,._Bf

- axial membrane + bending stress

,=r._F, +

IM,

- shear stress due to external shear force and torsion moment Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 26

NORTH ANNAUNII S 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA OENINUMR ANON-PROPRETARY 32-9049387-000 Noith Anna Units 1 & 2 The maximum stress intensities due to external loads (Thermal, OBE) are listed together with the stress components in Table 5-5 (Maximum WOL) and Table 5-6 (Minimum WOL). These stress intensities will be used in the ASME Code evaluation for primary + secondary stresses and fatigue in the nozzle regions (Section 9).. Additional stress intensities due to thermal stratification only are listed together with the stress components in Tables 5-7 through 5-16 for each load case.

These stress intensities will be included to account fox subcycles of'thermal stratification during fatigue evaluation (Section 9.2.4).

Table 5-5 Primary + Secondary Si Due to External Loads (Max WOL)

Axial Stress Shear Stiess M+B Loading tx-Ex OaBF ax__BM i axM+B Trt z_Mt "S

Sint

_ 1_

[ksi]

Inside Diameter PipeL P Wol SEUWeld SEUWol SEL Wol SEL Weld N Wol Noz Outside Diar PipeL P Wol SEU Weld SEUWol SEL Wol SELWeld NWoI Noz Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 27

NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA NUMBENON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2 Table 5-6 Primary + Secondary SI Due to External Loads (Min WOL)

Axial Stress Shear Stress M+B Lo di g

ax x o*BF Oax _Bm 0,,M+B Ta-r-Tgmt TS Sint

[oig]

[ksi]

Inside Diametet PipeL PWol SEUWeld SEUWol SEL Wol SEL Weld NWol Noz Outside Diamr PipeL P_Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol Noz Prepared by:

T.. Sorensen Reviewed by: I.. Stiaka Date: 04/2007 Date: 04/2007 Page 28

Table 5-7 Primary + Secondary S! Due to Thermal Stratification

(

) (Max WOL)

Load Case HU-Loading Axial Stress Shear Stress M+B OnEX ax DBF OaxBM

ax M+B TI*,

?_Mt T,

Sint

[ksi]

[ksij

[ksi]

Inside Diameter PipeL _

SEUWeld SEUWol SEL Wol SEL Weld N Wol Noz Outside Diam PipeL P Wol SEU Weld SEUWol SELWol SELWeld N_Wol Noz Prepmed by: T.. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 29

NORIH ANNA UNIIS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R EVA DoCUlMEN NMJ M PlIAN O

-R P I T R 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Table 5-8 Primary + Secondary Sl Due to Thermal Stratification Load Case HU-J(Min WOL)

Loading Axial Stress Shear Stress M+B OnxEx E

ax_B GaxBM 0 axM+B TsFs TsMt Sint

[ki]

[ i[ksi]

[ksi]

I[ksil

[ksi]

Inside Diameter PipeL-P Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol Noz Outside Diam PipeL P Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol Noz Prepared by:

T.. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 30

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA D1M3N7 NUMBER PLANT 1 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY Table 5-9 Primary + Secondary SI I

Due to Thermal Stratification

) (Max WOL)

Load Case HU-Loading Axial Stress Shear Stress M+B GffaXEX gax.BF 0 xBM ax M+B TsF TS_Mt Ts Sint

[ksi]

Inside Diameter

PipeL, P._Wol SEU Weld SEUWol SELWol SEL_Weld N_Wol Noz Outside Dian PipeL P_Wol SEUWeld SEU_Wol SEL Wol SELWeld NWol Noz L

Prepared by: T, Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 31

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVER1AY A

ANALYSIS A R E VA DOCuMENI NM~BER e

AREV DOUSEN MIMER L"TNON-PROPRIETARY

_ 32-9049387-000 North Anna Units 1 & 2 N

RY Table 6-10 Primary + Se ondary Sl Due to Thermal Stratification Load Case HU-(Min WOL)

Loading Axial Stress Sheat Stiess M+B CF'cEX 0YcBlE Gax BM 0 axM+B TFs TsMt Ts Sint

[ksi]

Inside Diameter PipeL P_Wol SEU Weld SEU Wol SEL Wol SELWeld N_Wol Noz Outside Diamt PipeL P Wol SEUWeld SEU Wol SEL Wol SELWeld N Wol Noz Prepared by:

T. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 32

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA Ue rm 1 32-9049387-00 NR PLANna UNON-PROPRIETARY 1

1 32-9049387-000 Noith Anna Units I & 211 Table 5-11 Primary + Secondary Sl Due to Thermal f

) (Max WOL)

Stratification Load Case HU-Loading Axial Stress Shear Strwes M+B 0 axEX Oax 0

BF B

Yuk-BM Gax M+B 75.8 Tsyt T.

Sint I

[ksi]

[ksij

[ksi]

[ksil

[ksi]

[ksil

[ksi]

Inside Diametet PipeL P_Wol SEU Weld SEU Wol SEL Wol SEL Weld N Wol Noz Outside Diame PipeL P Wol SEU Weld SEU Wol SEL Wol SELWeld N Wol Noz Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Page 33 Date: 04/2007

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AREV DMMENINUMER P AMNON-PROPRIETARY A

32-9049387-000 Noith Anna Units I & 2 Table 5-12 Primary + Secondary Sl Due to Thermal Stratification Load Case HU-

_)

J(Min WOL)

Loading Axial Stress Shema Stress M+B ouxEX 0x _BE OwkBM 0aM+B

_,Ts

'_Mt r,

Sint

[ksi]

Inside Diameter PipeL P_Wol SEU_Weld SEU Wol SEL Wol SEL Weld N Wol Noz Outside Diame

Pipel, P_Wol SEU Weld SEU Wol SEL Wol SELWeld N Wol Noz Prepared by:

T. Sorensen Reviewed by: 1. Straka Date: 04/2007 Date: 04/2007 Page 34

NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS ARE VA D

NMER A.R 32-9049387-000 Noith Anna Units I & 2 1O-1RETR Table 5-13 Primary + Secondary Sl Due to Thermal Stratification Load Case HU-M

](Max WOL)

Loading Axial Stress Shear Stress M+B (1 a EX (axBF

{UaxBM (GyM+B T.lFs T$_Mt Sint Iksi]

[ksi]

Inside Diametet PipeL P_Wol SEU Weld SEUWol SELWol SELWeld N Wol Noz Outside Diame PipeL PWol SEU_Weld SEUWol SELWol SEL_Weld N Wol Noz Prepared by:

T.. Sorensen Reviewed by: I.. Straka Date: 04/2007 Date: 04/2007 Page 35

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS 1

DOCU9MENT NUMBR LANI AREVA32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Table 6-14 Primary + Secondary SI Due to Thermal Stratification Load Case HU-

) (Min WOL)

Loading Axial Stress Sheat Stress M+B aax_-EX 0axBF (ax_BM (axM+B TsFs

,wMt Sint

[ksij

[ksi]

Inside Diametet PipeL P_Wol SEU Weld SEUWol SEL_

rol SEL Weld N_Wol Noz Outside Diame PipeL P Wol SEU Weld SEU Wol SEL Wol SELWeld N Wol Noz Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 36

NORIHANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R EVA VU*n~ Um 1 32-9049387-00 NoMB MANn UnNON-PROPRIETARY 11 32-9049387-000 North Anna Units I & 2 Table 5-15 Primary + Secondary Sl Due to Thermal

(

) (MaxWOL)

Stratification Load Case OP-Loading Axial Stress Shear Stress M+B I

EX G.,ý_BF (axBM 01ax_M+B

",F,

%r_Mt Sint

[ksi]

[ksil

[ksi]

Inside Diameter PipeL P_Wol SEUWeld SEU Wol SELWol SEL Weld N Wol Noz Outside Diaml PipeL P Wol SEU Weld SEUWol SEL Wol SELWeld

N_Wol, NOZI_,_._L__

Prepared by:

T.. Sorensen Reviewed by: T.. Straka Date: 04/2007 Date: 04/2007 Page 37

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R EVA DOCU~ME NUMBE PLA AREV DMUE~r~M90tPL"TNON-PROPRIETARY 32-9049387-000 Noith Anna Units 1 & 2 Table 5-16 Primary + Secondary Sl Due to Thermal Stratification Load Case OP-()

(Min WOL)

Prepared by: T. Sorensen Reviewed by: T. Stiaka Date: 04/2007 Date: 04/2007 Page 38

NORTH ANNA UNITS 1 &2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R EVA DOCUN*1 NUBE PIA)r AREVADMUNMNUM nmrNON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2

6.

DESIGN CONDITION The pressurizer assembly was designed to satisfy the ASME Code Criteria when operating at a pressure of (

J at temperature of'(

3 (Reference 13.8). These design conditions were simulated by setting a uniform temperature of (

) throughout the model (this temperature is only used to define material piopetties and not thermal expansion) and a uniform pressure of

(

) on all inside surfaces The Lower end of the Surge Nozzle Piping has the pressure applied to represent the hydrostatic end load. Also, pressure is applied to the assumed boundary edge at the end of Sutge Line Piping. The ANSYS output file for the design condition stress analysis is "DesignCond.out" and "DesignCond_min.out" for maximum and minimum WOL respectively.

Stress analysis of the model under design pressure case served two important purposes.. It provides a basis for verification of the correct behavior of the model as well as boundary conditions. Stresses firom the design pressure run are used to evaluate the primary stresses in the model in Section 9.. Attenuation of stress effects at regions distant firom the nozzle is also verified.

Figure 6-1 shows the deformed shape of the Maximum WOL model under the design -pressure along with the outline of the un-deformed shape.. The stress intensity contours developed in the Maximum WOL model under design pressure are shown in Figure 6-2 and Figure 6-3..

Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 39

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WE[LD OVERLAY A

ANALYSIS A R EV A DOCUMEN NU BE PANt A

A 3-4300 Nt AnnaM Uits I2NON-PROPRIETARY 1

1 32-9049387-000 North Anna Units I & 211 Figure 6-1 Deformed Shape versus Un-deformed Outline Prepared by:

T., Sorensen Reviewed by: T.. Straka Date: 04/2007 Date: 04/2007 Page 40

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA m

1 3-49800 N

Anna UnitsNON-PROPRIETARY 1

132-9049387-000 Nolth Anna Units I & 211 Figure 6-2 Stress Intensity Contours at Design Condition (Maximum WOL Shown)

Prepared by: T, Sorensen Reviewed by: r.. Straka Date: 04/2007 Date: 04/2007 Page 41

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA DOCUMIUBER nPANNO-RI 32-9049387;-000 Noith Anna Units 1 & 2 NON-PROPRIETARY Figure 6-3 Stress Intensity Contours at Design Condition Boundaries (Maximum WOL Shown)

Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 42

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA DOCUMENI-* ASER PLANT 1

32-9049387-000 North Anna Units I & 2

7.

THERMAL ANALYSIS The operating thermal loads are defined by the thermal transient conditions as contained in Reference 13.16. A summary of the applicable Service Level A (Normal) and Service Level B (Upset) transients including the applicable design cycles, is shown below in Table 7-1. The numbers of cycles listed below correspond to 60 years of'pressuizer design life.

Table 7-1 Transients Transient Opri Cycle Name ccurrences Operating ID Number F ing Abbreviation o OCondition 1

Unit heatup at HL surge nozzle 2

Unit cooldown at HL surge nozzle 3

Plant Loading at 5% power per minute 4

Plant Unlaoding at 5% power per minute 5

10% step load increase 6

10% step load decrease 7

Large step decrease in load 8

Loss of load 9

Loss of power 10 Loss of flow in one loop 11 Feedwater cycling at hot shutdown 12 Boron Concentration Equalization 13 Reactor trip with no cooldown 14 Reactor trip with cooldown but no safety injection 15 Reactor trip with cooldown and safety injection 16 Inadvertent reactor coolant system 16 depressurization 17 Inadvertent startup of an Inactive loop 18 Control rod drop 19 Inadvertent safety injection actuation 20 Steady state fluctuations ("

21 Turbine roll test 22 Loop out of service normal loop shutdown 23 Loop out of service normal loop startup 24 RCS cold overpressurization 25 Heatup and Cooldown Surge Flow Details H1-H6 and Cl-C7, Subcycles of Heatup and Cooldown r

Normal Upset Normal Upset Normal Test Normal Normal Upset Normal Normal 26 Thermal Stratifications Note:

() These small fluctuations create small stresses that are negligible compared to other transients.

Prepared by:

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA DOCUMMNT NUMBER PLANT 32-9049387-000 Noith Anna Units I & 2 The Cooldown Tiansient was combined with the Heatup Transient Only the times were changed to set zero mark at 27 hours3.125e-4 days 0.0075 hours 4.464286e-5 weeks 1.02735e-5 months for Cooldown.. Similarly, the Plant Unloading transient was combined with Plant Loading with its start time set to 0.4444 hours0.0514 days 1.234 hours 0.00735 weeks 0.00169 months .. The detailed thermal loading due to these transients were applied to the thermal finite element model in the form of fluid and steam temperatures and HIC versus time..

The computer input files containing definition of'these transients are:

The computer output files for the thermal analyses of the transients are:

No computer output is Included with this document. The proprietary version of this document (32-9038239-000) contains computer output files which are attached to the proprietary version of this document and are available in the AREVA COLD storage system,,

Prepared by:

T. Sorensen Reviewed by: T., Straka Date: 04/2007 Date: 04/2007 Page 44

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS A R E VA IDOCUMENT NUMBER PIANTN I -

32-9049387-000 North Anna Units 1 & 2 N

RY The results of' the thermal analyses ate evaluated by examining the magnitude of' tempetature differences between key locations of' the model (see Figure 7-1). The time points of the maximum tempetature gradient are those at which the maximum thermal stresses develop.,

Ihe computer output files that provide the tempeiatures at the selected locations are:

No computer, output is included with this document,. The proprtietary version of' this document (32-9038239-000) contains computer-output files which are attached to the proprietary version of this document and are available in the AREVA COLD storage system..

Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 45

NORTH ANNA UNIIS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AR EVA DOCUMNI NUMBE K1M 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY Ihe temperature gradients between these key locations (See Figure 7-1) are also listed in the above output files. The Theimal gradient for each transient are plotted in Figure 7-3 thr-ough Figure 7-22 for the maximum WOL configmation only.- The minimum configuration thermal plots look very similar to those of the maximum. These figures are used only to show the trend..

Specific data are taken fiom the computer output files.

Table 7-2 Nodes of Interest for Evaluation of Temperature Gradients Location Max WOL Min VOL Designation Node Node Location Description in ANSYS No.

No.

DT Files 2

3145 2412 Mid thickness in Piping lower than SWOL region 3

3774 3480 Mid thickness in lower SWOL 4 & 6 6350 6105 Inside surface of Piping in SWOL Region 5

6193 5950 Outer surface of lower SWOL 7

6159 6001 Outer surface of SWOL horizontal With Pipe-to Safe End Weld 8

5135 4968 Inside surface of Nozzle above the Safe End-to-Nozzle Weld 9

6134 6073 Outer surface of SWOL horizontal with Location 8 10 5179 Not Analyzed Inside surface of Nozzle at Mouth 11 4969 Not Analyzed uter surface of Nozzle at Nozzle-to-Head Transition Table 7-3 Temperature Gradients of Interest Gradient Designation in Gradient Gradient Description ANSYS DT Files Location GradientDescription 21 2 to 3 Lower Piping to SWOL 22 4 to 5 Inside Piping to Outer SWOL 23 7 to 6 Inside Piping to Outer mid-SWOL 24 9 to 8 Outer SWOL to Nozzle Annulus Surface Outer Nozzle-to-Head Transition to Inside Surface 25 11 to 10 Nozzle Mouth Prepared by:

T. Sorensen Reviewed by: T, Straka Date: 04/2007 Date: 04/2007 Page 46

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA DOCUEN NUM NNON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2 Blank Page Inserted to Maintain Page Numbering Prepared by:

T.. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 47

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY A

ANALYSIS AREVA vOCU

MENTNUMM 1

32-9049387-000 Noth Anna Units I & 2 Note: Nodes weie not selected at the nozzle mouth region in Minimum Weld Overlay. That area is fir enough away fiom the weld overlay region Figure 7-1 Location of Node Numbers for Evaluation of Temperature Gradients Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 48

A NORTH ANNA UNITS 1

&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AREVA D

UN O

32-9049387-000 North Anna Umts I & 2 NON-PROPRIETARY Figure 7-2 Temperature and Temperature Gradients for Surge Plant HeatuplCooldown Transients for Maximum WOL Configuration Prep ared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 49

A*

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DOCUleffNUMER PLOU 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY K-0

..,0)

Figure 7-3 Temperature and Temperature Gradients for Surge Plant LoadinglUnloading Transients for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 50

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R EVA OCOM WNTIUM PLN R

32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY J2 Figure 7-4 Temperature and Temperature Gradients for Surge 10% Step Load Increase Transient for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 51

-A, NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R E VA Doc M UNr NNR 32-9049387-000 North Anna Umts 1 & 2 NON-PROPRWETARY K

2 Figure 7-5 Temperature and Temperature Gradients for Surge 10% Step Load Decrease Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 52

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DC RAF14T NUM M

PLA 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY K

K%

-7 Figure 7-6 Temperature and Temperature Gradients for Surge Large Step Decrease in Load for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 53

A NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R EVA DOWMEMR PL"T 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY K

2 Figure 7-7 Temperature and Temperature Gradients for Surge Loss of Loadfor Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 54

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AREVA DOCUME 1NUMBMN 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Figure 7-8 Temperature and Temperature Gradients for Surge Loss of Power Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 55

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AREVA DOUMTNUM PLANON-PROPRIETARY 32-9049387-000 North Anna Units I & 2

.W-0)

... 'Figure 7-9 Temperature and Temperature Gradients for Surge Loss of Flow Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 56

" A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS

.'AR EVA DOCUMENrUMBER PLANT 1

_32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY J2

ýFigure 7-10 Temperature and Temperature Gradients for Surge Feedwater Cycling at Hot Shutdown Transient for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 57

A NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R EVA PL ANT 32-94938-00 Nor ANON-PROPRIETARY 32-9049387-000 North Anna Units I & 2 K-11 K

2 Figure 7-11 Temperature and Temperature Gradients for Surge Boron Concentration Equalization Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 58

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DOC-ErTMrE MAW I

__1_32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY 2

Figure 7-12 Temperature and Temperature Gradients for Surge Reactor Trip with No Cooldown Transient for Maximum WOL Configuration Prepared by: T. Soremsen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 59

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA PLNNT N

RY 32-9049387-000 North Anna Umts 1 & 2 NON-PROPRIETARY

Figure 7-13 Temperature and Temperature Gradients for Surge Reactor Trip with Cooldown but no Safety Injection Transient for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 60

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DOCMMENT NUMM PLANT 1

32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY K

Figure 7-14 Temperature and Temperature Gradients for Surge Reactor Trip with Cooldown and Safety Injection Transient for Maximum WOL Configuration Kil Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 61

A NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R EVA..

D rMO NUMBE PANT 1

32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY 2

Figure 7-15 Temperature and Temperature Gradients for Surge Inadvertent Reactor Coolant System Depressurization Transient for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 62

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA D

E PLA 1

32-9049387-000 North Anna Units 1 &2 NON-PROPRIETARY Figure 7-16 Temperature and Temperature Gradients for Surge Control Rod Drop Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Page 63 Date: 04/2007

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AREVA DUM*_

R M.

PLANT 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Figure 7-17 Temperature and Temperature Gradients for Surge Inadvertent Startup of an Inactive Loop Transient for Maximum WOL Configuration 7

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T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 64

A*

NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

AR EVA

]DOCUMENr NUMB PLAW 1

32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY K.

2 Figure 7-18 Temperature and Temperature Gradients for Surge Inadvertent Safety Injection Actuation Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 65

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DCMErr *JA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Figure 7-19 Temperature and Temperature Gradients for Surge Turbine Roll Test Transient for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 66

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A R EVA DO*vMUrMM PLANT 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY

.-0e)

Figure 7-20 Temperature and Temperature Gradients for Surge Loop Out of Service Normal Loop Shutdown Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 67

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DOCUMrr N PLNRr 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY Figure 7-21 Temperature and Temperature Gradients for Surge Loop Out of Service Normal Loop Startup Transient for Maximum WOL Configuration Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 68

A NORTH ANNA UNITS 1&2. PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS AR EVA DoNuuLmThER PNLAO 1

32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Figure 7-22 Temperature and Temperature Gradients for Surge RCS Cold Overpressurization for Maximum WOL Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 69

8.

STRUCTURAL ANALYSIS Stiess analyses are performed at those time points which the maximum temperature giadients (maximum theirmal stresses) in addition to those defining the transient in Reference 13.16. The nodal tempeiatute at the particular time point is read into the structural model directly flom the result file of the theimal analysis. The corresponding pressure is obtained through linear inteipolation fi-om appropriate tables listed in Reference 13.16. All time points of interest are also listed in Appendix B.. The computer output files for the stiuctural analyses are:

No computer output is included with this document. The proprietary version of this document (32-9038239-000) contains computer output tiles which are attached to the proprietary version of this document and ate available In the AREVA COLD storage system, Prepared by:

T.. Sorensen Rnvinweti hv-T.Straka Date: 04/2007 Date: 04/2007 Page 70

A

....NORTH ANNA UNIT S 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS ADMUNMNI NOdBIER PL ANM A R EVA NON-PROPRIETARY 32-9049387-000 North Anna Units 1 & 2

9.

ASME CODE CRITERIA The ASMIE Code stress analysis involves two basic sets of criteria:

1. Assure that failure does not occur due to application of the design loads.

2. Assure that failure does not occur due to repetitive loading.

In general, the Primary Stress Intensity criteria of the ASME Code (Reference 13.1) assure that the design is adequate for application of design loads.

Also, the ASME Code criteria fat cumulative fatigue usage factor assure that the design is adequate for repetitive loading..

9.1 ASME CODE PRIMARY STRESS INTENSITY (SI) CRITERIA Per NB-3213..8 of Reference 13.1, the primary stresses are those normal or shear stresses developed by an imposed loading such as internal pressure and external loadings. A thermal stress is not classified as a primary stress. The classification as well as the limit of'primary stress intensity is specified in NB-3221 of Reference 13.1 for Design Conditions.. The limit of' primary stress intensity for Level B (Upset), Level C (Emergency), and Level D (Faulted) is specified in NB-3223, NB-3224, and NB-3225 of Reference 13.1, respectively.

As presented in Reference 13.14, the primary stress intensity criteria are the basic requirements in calculating the weld overlay size, which is under the assumption that a 360' circumferential flaw has grown completely through the original weld. Loading conditions in each service level have been considered in the weld overlay sizing calculation.. The nozzle to piping region has been reinforced by the weld overlay since adding materials to the nozzle outside region relieves primary stress burden resulting from internal pressure and external loads.. The overlay further reduces stress concentration by eliminating the outside surface discontinuity.. Therefore, the primary stress intensity requirements for the surge nozzle, welds with overlay, safe end and piping have been satisfied for all service level loadings without the need for firther evaluation.

Other related criteria include the minimum required pressure thickness (NB-3324 of' Reference 13.1) and reinforcement area (NB-3330 of Reference 13..1), which were addressed in the original nozzle/pressurizer designs.. Adding weld overlay will increase the nozzle wall thickness and therefore these tequirements are satisfied.

Prepared by:

1. Sorensen Date: 04/2007 Page 71 Reviewed bv: T. Straka Date: 04/2007

9.2 ASME CODE PRIMARY+SECONDARY STRESS INTENSITY (SI) CRITERIA As stated previously, the analyses of stresses for transient conditions ae required to satisfy the requirements for the repetitive loadings.. The following discussion describes the fatigue analysis process employed herein for the design.

Oveiall stress levels are reviewed and assessed to determine which model locations require detailed stress/fatigue analysis. The objective is to assure that:

1. The most severely stressed locations are evaluated.

2 The specified region is quantitatively qualified.

9.2.1 Path Stress Evaluation The ANSYS Post Processor is used to tabulate the stresses along predetermined paths and classify them in accordance with the ASME Code Criteria (i.e., membrane, membrane plus bending, total). For paths that go through 2 materials partial paths are taken in addition to the free edge to free edge..

The paths are shown in Figure 9-1 and Figure 9-2 and are described in Table 9-1. For post processor calculation, the definitions of these paths ate contained in the computer input files as follows:

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A NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS ADOCUMENT NUMBER PLANT A R EVA NON-PROPRIETARY 32-9049387-000 Noith Anna Units 1 & 2 NN-R RIT Y

Table 9-1 Path Descriptions Path Name Maximum Weld Overlay Minimum Weld Overlay Inside Node Outside Node Inside Node Outside Node PipeL 6289 6340 6172 6103 P Wol 6290 6203 6216 5986 P Wola 6290 6205 6216 5988 P Wolb 6205 6203 5988 5986 SEU Weld 6426 6157 6244 6001 SEU Welda 6426 6161 6244 16050 SEU Weldb 6161 6157 16050 6001 SEU Wol 6472 6213 6292 5947 SEU Wola 6472 6209 6292 6012 SEU Wolb 6209 6213 6012 5947 SEL Wol 5230 6228 5060 5958 SEL Wola 5230 6226 5060 6038 SEL Wolb 6226 6228 6038 5958 SEL Weld 6437 6243 6255 6052 SEL Welda 6437 6240 6255 6054 SEL Weldb 6240 6243 6054 6052 N Wol 4935 6133 4803 6072 N Wola 4935 5206 4803 5037 N Wolb 5206 6133 5037 6072 Noz 4899 5039 4985 4868 NozL 5179 4969 NA NA Sleeve 5246 5249 5078 5081 Prepared by: T. Sorensen Reviewed bv: T. Straka Date: 04/2007 Date: 04/2007 Page 73

Note: The full path is taken at the same location as the partial paths, The partial path name has the letter "a" ora "b" behind the full path name.

Figure 9-1 Path Locations in. SWOL Region used for Stress Evaluation Prepared by:

T.. Sorensen Reviewed by: T Straka Date: 04/2007 Date: 04/2007 Page 74

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCU*MNT NUMBER PLANI A R EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Note: Due to the distance fiom the WOL. region, NozL was only evaluated in the maximum configuration computer files Figure 9-2 Path Locations in Nozzle used for Stress Evaluation Prepared by: T. Sorensen Reviewed bv: T'. Straka Date: 04/2007 Date- 04/-007 Page 75

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCMDENT MIMER PLAN" AREVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY 9.2.2 Primary + Secondary Stress Intensity Range Qualification (NB 3222.2)

The ANSYS Post Processor Was used to find the membrane + bending Stress Intensity Ranges and total Stress Intensity Ranges based on the method prescribed in paragraph NB-3216..2 of the ASME Code.. The computer runs containing the results of the stress ranges calculation for' membrane + bending, total stresses and associated usage factors ate listed below.

No computer-output Is included with this document.

The proprietary version of this document (32-9038239-000) contains computer, output files which are attached to the proprietary version of this document and arc available in the AREVA COLD storage systen.

The membrane + bending stress ranges as determined in the stress range tuns are conservatively combined by hand with the stresses due to external loads (calculated in Section 5,2) where appropfiate.. The maximum membrane + bending Stress Intensity Ranges are compared directly to the Primary + Secondary Stress Intensity Range criteria of the ASME Code. T he summary of maximum membrane + bending Stress Intensity Ranges for maximum and minimum WOL configmations ate tabulated in Table 9-2 through Table 9-6.

Note that the Zero Stress State (ZSS) is included in the ANSYS rums listed above.

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T, Sorensen Reviewed by: T Straka Date: 04/2007 Date: 04/2007 Page 76

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENT NUMBER PLANT AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Table 9-2 Summary of Maximum Primary + Secondary SI Ranges for Membrane +

Bending Stresses (Maximum WOL)

Transient Stresses Applicable External Stresses Path SI Range SI Range Maximum SI Minimum SI Inside Node Outside Node Inside Node Outside Node

[ksi]

PipeL P Wol P Wola P Wolb SEU Weld SEU Welda SEU Weldb SEU Wol SEU Wola SEU Wolb SEL Wol SEL Wola SEL Wolb SEL Weld SEL Welda SEL Weldb N Wol N Wola N Wolb Noz NozL Sleeve Note I'): External stress at outside node of full path is conservatively used for the partial path node located at material interface Prepared by: T. Sorensen Reviewed bv: T, Straka Date: 04/2007 Date: 04/2007 Page 77

Table 9-3 Comparison of Maximum SI Range Including External Loads to ASME Code 3*Sm Criteria (Maximum WOL)

Transient + External StresSes Allowable M+B SI Range Material 3*SmQ')

Path SI Range SI Range Inside Node' Outside Node Inside Node Outside Node

[ksi]

Inside Node Outside Node Pipel[ksi]

[ksi]

P Wol P Wola PWolb SEU Weld SEUWelda SEU Weldb SEU Wol SEU Wola SEU Wolb SEL Wol SEL Wola SEL Wolb SEL Weld SEL Welda SEL Weldb NWol N Wola N Wolb Noz NozL Sleeve Note I'):

Note (2):

Note ():

Note (4 I

Prepared by: 1. Sorensen Reviewed by: T. Stmka Date: 04/2007 Date: 04/2007 Page 78

f Note (5:

Note (6):

Note (7)

Note (8):

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L*. Sorensen Reviewed by: I.. Straka Date: 04/2007 Date: 04/2007 Page 79

Table 9-4 External Stress Added by Components (Maximum WOL)

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A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

A DOC;MEN3 8M*Oto NLANI AREVA

~32-9049387-000 Noith Anna Units I & 2 O PR RET Y

Table 9-4 (Continued) External Stress Added by Components (Maximum WOL)

Note (1): Since the stresses due to external loads can be tevetsible, the stress direction (+/-) resulting into maximum SI iange is used conseivatively.

Note (2): Simplified Elastic Plastic Method is required for the path exceeding 3xSm limit, see Section 9 2 3.

Prepared by: 'T.. Sorensen Reviewed bv: T. Straka Date: 04/2007 Page 81 atei* f04/nfl07

A NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENt NUMER PANT AR EVA 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY Table 9-5 Summary of Maximum Primary + Secondary S! Ranges for Membrane +

Bending Stresses (Minimum WOL)

Transient Stresses Applicable Extet nal Stresses Path SI Range SI Range St Range SI Range Inside-Node Outside Node Inside Node Outside Node

[ksi]

[ksil

[ksi]

PipeL P Wol P Wola P Wolb SEU Weld SEU Welda SEU Weldb SEU Wol SEU Wola SEU Wolb SEL Wol SEL Wola SEL Wolb SEL Weld SEL Welda SEL Weldb N Wol N Wola N Wolb Noz Sleeve Note 0): Exteral. stress at outside node of full path is conservatively used for the partial path node located at material interface Prepared by:

T. Sorensen Reviewed bv: T. Straka Date: 04/2007 Page 82 rT)tp.. NA/1tN7

Table 9-6 Comparison of Maximum SI Range Including External Loads to ASME Code 3*Sm Criteria (Minimum WOL)

I Allowable M+B SI Range Tiransient + Extemaal Stresses

-.. II I

Phrepared by:

T. Sorensen Reviewed by: T. Stiaka Date: 04/2007 Date: 04/2007 Page 83

Note (4):

/

Note (5):

Note (6):

J2 Prepared by: T. Sorensen Revi-wepd hvb T. Stralca Date: 04/2007 Date: 04/2007 Page 84

Table 9-7 External Stress Added by Components (Minimum WOL)

Prepared by:

T.. Sorensen RAviewid hw T Rtrnka Date: 04/2007 Date: 04/2007 Page 85

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUME*N NUMBM, M ANI AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Table 9-7 (Continued) External Stress Added by Components (Minimum WOL)

Note (1): Since the stresses due to external loads can be reversible, the stress direction (+/-) resulting into maximum SI zange is used conservatively.

Note ( Simplified Elastic Plastic Method is required for the path exceeding 3xSm limit, see Section 9.2 3.

Prepared by: T. Sorensen ReIviewFed hv-T RttrAkn Date: 04/2007 Date: 04/2.007 Page 86

9.2.2.1 Summary ojStress Intensity Range Qualification Tables 9-3, 9-4, 9-6 and 9-7 show the maximum SI Range calculated and the allowable limits for both maximum and minimum weld overlay configurations.

The following path locations for both configurations exceeded the allowable 3*Sm limit:

PipeL - inside and outside nodes (maximum and minimum WOL)

Sleeve - inside node (maximum WOL)

The ASME Code allows the 3*Sm limit to be exceeded under special conditions, one of them being that Simplified Elastic-Plastic Analysis (NB 3228.5) is used for fatigue analysis., See Section 9.2.3 for' firther qualifications.

9.2.3 Simplified Elastic-Plastic Analysis (NB-3228.5)

The maximum Primary + Secondary Stress Intensity criteria in Section 9.21 is not met for the locations determined in the Section 9.2.2.. Therefore, the simplified elastic-plastic analysis for these locations is provided in this section.

The Primary + Secondary Stress Intensity range in the model may exceed 3*Si if' the requirements of'the simplified elastic-plastic analysis are met. The requirements are:

9.2.3.1 Primary + Secondary S1Range (Excluding thermal bending stresses) (NB-3228.5(a))

The range of Primary + Secondary membrane + bending stress intensity, excluding thermal bending stresses, shall be <3*Sm.

Ihe SI ranges excluding thermal bending are calculated for the locations identified in Section 9.2.2.1. The membrane + bending ANSYS output files listed in Section 9.2.2 are used to find the stress components for membrane stress due to pressure and thermal conditions.

The bending stress due to pressure only is determined by multiplying the bending stress obtained florm design linearization output files (Designjlinearization.out, Designjlinearization_ rmin.out) with a pressure ratio. The ratio is based on the transient pressure at the time point of interest and design pressme. The ratioed bending stress is added to the membrane stress and external stress for determination of' SI range without thermal bending effect.

The design condition is(

J. The applied temperature affects only physical material properties, therefore the effect of thermal bending is considered to be negligible.

Tables 9-8 and 9-9 present the calculations and results for the maximum primary + secondary SI Ranges for' membrane + bending - thermal bending stresses per' NB-3228.5(a) for the maximum and minimum WOLs.

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENT NUMBER PLANT AR EVA 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY Table 9-8 Maximum WOL SI Ranges Minus Thermal Bending Prepared by:

T.. Sorensen Ppvi-wpr hv" T Rttikl Date: 04/2007 Dntp: 04/2007 Page 88

Table 9-8 (Continued) Maximum WOL SI Ranges Minus Thermal Bendin, Note (1): Since the stesses due to external loads can be teversible, the stress direction (+/-) resulting into maximum SI iange is used conseivatively..

Note (2): See Table 9-3 Note (): See Table 9-4 Prepared by: T. Sorensen

]D,=,;*

hty-kr T Qfrlra Date: 04/2007 ThntP* nMA/9f7 Page 89

Table 9-9 Minimum WOL Sl Ranges Minus Thermal Bending Note (1): Since the stresses due to external loads can be reversible, the stress direction (+/-) resulting into maximum SI range is used conservatively, Note t2): See Table 9-7 Prepared by:

T.. Sorensen lPrpuuw1hv. T.*t5*h-Date: 04/2007 TlatP*. OAn/f7 Page 90

All SI Ranges listed in Tables 9-8 and 9-9 are less than the allowable stress, therefore the requirement ofASME NB-3228.5(a) has been met on all locations.

9.2.3.2 Factor Ke (NB-3228.5(b))

The values of Sa used for entering the design fatigue curve is multiplied by the factor K¢, where

-n S

3S,

1) for3Sm<S,<3mSm K, = 1.0 +-A 1

fo,3 S n-(m-1) (3-S.

K, =l.O/n forS,, >3.rmeS,.

m = 1.7 for austenitic stainless steel fion Table NB-3228.5 (b)-I (Reference 10.1) n = 03 for austenitic stainless steel flom Table NB-3228.5 (b)-I (Reference 10 1)

Sm [ksi]

@ average temperature of the metal at the critical time points S. [ksi]

Primary + Secondary membrane plus bending SI Range The K. factor is calculated for each SI Ranges over the 3Sm limit in the fatigue evaluation as documented in Section 9.2A..

9.2.3.3 Fatigue Usage Factor (NB-3228.5(c) and NB-3222.4)

For fatigue usage factor evaluation see Section 9.2.4.

9.23.4 Thermal Stress Ratchet (NB-.322&85(d) and NB-3222.5)

Iheimal Ratchet is considered fox the locations listed in Section 9 2 2.1.

Some of these locations are parts of the local geometric discontinuities. Ihe ASME Code requirements fox thermal ratcheting ame considered accurately only for cylindrical shells without discontinuities. On the other hand, the requirements for thermal ratcheting at discontinuities are considered to be "probably overly conservative" (Reference 13.12, page 207).

Maximum Allowable Range of Thermal Stress (NB-3222.5):

Tables 9-10 and 9-11 determine the maximum allowable ranges oftheimal stresses in the piping and thermal sleeve. The values of allowable stresses axe conservatively calculated based on the membrane stresses due to the design pressure (

)

The "SINT" values are obtained fiom ANSYS output files Design_linearization.out and Designjlineatizationmin.out.

NB-3222..5 only requires the SI Range to include thermal SI Ranges and those fi'om the output files also contain pressure effects The Thermal SI Ranges are calculated in Tables 9-12 and 9-13 Prepared by:

T.. Sorensen R1vw.w*Id byv" T Straka Date: 04/2007 Date: 04/2007 Page 91

A AREVA NORTH ANNA UNITS "l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMEI NUMBER PLAN!

32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Table 9-10 Allowable Ranges of Thermal Stresses for Maximum WOL Note (1): See Table 9-4 Note (2): See Table 9-3 Note (): See Table 9-12 Table 9-11 Allowable Ranges of Thermal Stresses for Minimum WOL SI Average Sm I.*S S

Allowable Path Range(2)

Temperature S.xm SI Range I.ksi]

[OF]

I [ksi]

[ksi]

I[ksi]

Note I": See Table 9-7 Note (2): See Table 9-13 Where:

x = max.. general membrane stress due to pressure ("SINT") divided by the yield strength S y0 y1=1 for 0.0<x<0..5; y'=4(1-x) for0.5<x<l.0 X

Maximum allowable range of thermal stiess = y'

S Note (o): 1 SS,, is used instead of Sy.. Pei NB-3222.5, note 11, it is permissible to use I.5Sm in this equation whenever it is gieatei than Sy.

The maximum SI Ranges of thermal stresses ate less than the allowable stresses; therefore the requirement has been met.

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Table 9-12 Thermal M+B SI Range for Maximum WOL Prepared by:

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A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMEN 7 NUMBER Pi"AI I

AR EVA 32-9049387-000 North Anna Units I & 2 NON-PROPRIETARY Table 9-12

/10 (Continued) Thermal M+B Sl Range for Maximum WOL Note (1): Thermal Membiane stresses aie equal to the Ih+Pzessure Membrane stresses - Pressure Ratio x Pressure Only Membxine stresses Note (

Thermal Bending stresses are equal to the Th+Pressuie Bending stresses - Pressum Ratio x Pressure Only Bending stresses..

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A NORIH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCU N(NI NUMBER PIMAN]

1 AREVA 32-9049387-000 Notth Anna Units 1& 2 NON-PROPRIETARY Table 9-13 Thermal M+B Sl Range for Minimum WOL Note (1): Iheimal Bending stresses are equal to the Th+Pressure Bending stresses - Pressure Ratio x Pressure Only Bending stresses Note (2): Thermal Membrane stresses are equal to the Th+Pressure Membrane stresses - Pressure Ratio x Pressure Only Membrane stresses Prepared by:

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A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENI NUMBER KlANMi AR"VA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Blank Page Inserted to Maintain Page Numbering Prepared by:

T. Sorensen Date: 04/2007 flot.-

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9.2.3.5 Temperature Limits (NB-3228.5(e))

The maximum temperature of the components is(

which does not exceed the maximum allowable temperatures listed in Table NB-3228.5(b)-l, Reference 13.1.

Therefore, the ASME Code requirement is met.

9.2.3.6 Minimum Strength Ratio (NB-3228.5(0)

The material shall have specified minimum yield strength to specified minimum tensile strength ratio of less then 0.80.

The Sy and Su, values at 70'F are obtained fiom Reference 13.15..

For Thermal Sleeve, Path 'Sleeve' (

J Specified minimum yield strength, Sy = 30 ksi @70q Specified minimum tensile strength, S, = 75 ksi @701F Ratio of S/S^

0..4 For Piping, Path 'PipeL', (

3 Specified minimum yield strength, Sy = 30 ksi @70'F Specified minimum tensile strength, S, = 75 ksi @70VF Ratio of S/SU = 0.4 Therefore, the ASME Code requirement is met-Prepared by:

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9.2.4 Fatigue Usage Factor Calculation For consideration of fatigue usage, the Peak Stress Intensity Ranges awe calculated. These values must include the total localized stresses The fatigue usage factor at a location is usually calculated based on the actual stress intensity range.. However, at a geometric or mateiial discontinuity, an unrealistic peak stress may result fiom the modeling approach, element type and mesh sizes. The total stress obtained foin the finite element analysis may not be able to capture the actual stress condition. To account fox the possible modeling inaccuracies, an FSRF is usually applied to the M+B stress intensity range for location experiencing the discontinuity The stress category used in fatigue evaluation, along with an appropriate FSRF, for each node is listed in Table 9-14. For path lines nearby the thermal sleeve weld (i.e., crevice), M+B stresses with a FSRF of 4 0 are applied.. Per Reference 13.113 (p.. 395), the FSR.F for node on the inside and outside ofthe safe end component, outer nozzle, and pipe near WOL junction ae based on a bounding taper angle.

Table 9-14 Stress Category and FSRF in Fatigue Evaluation P

Inside Node Outside Node Path Name Stress Category FSRF Stress Category FSRF PipeL TOTAL M+B P Wol M+B TOTAL P Wola M+B TOTAL P Wolb TOTAL TOTAL SEU Weld M+B TOTAL SEU Welda M+B M+B SEU Weldb M+1B TOTAL SEU Wol M+B TOTAL SEU Wola M+B M+B SEU Wolb M+B TOTAL SEL Wol M+B TOTAL SEL Wola M+B M+B SEL Wolb M+B TOTAL SEL Weld M+B TOTAL SEL Welda M+B M+B SEL Weldb M+B TOTAL N Wol TOTAL TOTAL N Wola TOTAL TOTAL N Wolb TOTAL TOTAL Noz TOTAL M+B NozL M+B M+B TS TOTAL M+B1 Prepared by:

T. Sorensen Date: 04/2007 flntp-n*ldNA7 Page 98

For the location determined to be critical, the corresponding external loads fiom Table 5-5 through Table 5-16 have been incorporated in the fatigue calculation.. Using the SI ranges and cycles taken fiom the "fatigue" output files (see Section 12.0),

the bounding external SI (including thermal stratification) have been added manually to the first 500 cycles and the fatigue usage fhctor then recalculated. This method of adding the external SI to the transient SI is a conservative method as shown in the previous sections.

As stated in Table 5-30 of' Reference 13.16, within the Heatup and Cooldown cycles there exist sub-cycles (minor cycles) at the beginning and end of the transients (major cycles) respectively.

(see Section 12.0).

The thermal stratification external loads are included in the fatigue calculation as independent sub-cyles.. For each case the usage factor calculation is based upon the SI specified in Table 5-7 through Table 5-16 and the number of cycles for each case as stated in Reference 13.8.

The following pages contain the calculation of the cumulative fatigue usage factor for the points of interest. The usage factor include Transients loading and all applicable external loadings. The calculation is performed separately for seven materials and different parts of model..

The critical locations ame:

K Prepared by: T. Sorensen D -A

-.... A U.-, T" C.hv-,L*

Date: 04/2007 Thatp. AAI,)n67 Page 99

Path Name PipeL. (outside)

Maximum Weld Overlay Output File:

fatiguePipe M+B out Node FSRF=- 16 SUB Pipe_M+B.out MATERIAL:

TYPE: High Alloy UTS (psi) =

3Sm= 49 1 E matl (psi) 1 E ratio =CE cruve' / E analysis')=1.14

)Salt--(M+B+Ext. Load)*FSRWt2 LREQD MB EKe x

ALLOWABLE USAGE RANGE TRANSIENTS WITH CYCLES SI Load CYCLES FACTOR S aft ksi 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 HU/RT CDSI HU/RCOP 1-U/CD CD/SIA RCSD/SIA SIA/SUIL CRD/SIA CRD/ILOP CRD/LOSISD LOSLSD/RT CDnSI IOtDRIC.DnSI RI_CDnSI/RTnoCD FCHSD/RTnoCD F CHSD/LOF FCHSD/PL PIJPL LSDI/LSDL IOSLdec/lOSLdec BCEIIRT BCE/UL 10SLinc/BCE BCE/ILOSLSU r

23 BCE/BCE 24 HU-340 25 HU-200 26 HU-100 27 HU-147 28 OP-43 Sub-Cycle within HUCD K Prepared by: T. Sorensen nI U.

T 04-..,-#.

Date: 04/2007 TA.f.- AA/1nA7 Page 100

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DAUMN w

NUwmBER PLANI AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY Path Name SEUWelda (inside)

Minimum Weld Overlay Output File: m fatigueP2SETOTAL out Node F

FSRF= 100 mSUB_P2SErOTAL.out MATERIAL:

TYPE: High Alloy UTS (psi) =

3Sm=- 49 3 EUT (psi J

Erat o =CE curve' / 'E analysis')=l.14 J Salt=(Iotal+Ext. Load)*SRF/2 REQ'D Total Ext.

Kex ALLOWABLE USAGE RCCEQS Ke ratlo)'

CYCWALES ACO RANGE TRANSIENTS WITH SI Load I Salt ra x

C FACTOR I

I, S aft ksi YCE I

RCSD/SUIL 2

RCSD/RT CDSI 3

RCOP/SIA 4

HU/RI_CDnSI 5

HU/LOSLSD 6

LOSLSD/SIA 7

CRD/SIA 8

CRD/LOL 9

LOF/LOL 10 LOF/RI noCD 11 FCHSD/RT noCD 12 FCCHSD/RI_noCD 13 FCHSD/LSDL 14 1OSLDec/FCHSD 15 1OSLDec/CD 16 10SI.Dec/LOP 17 1OSILDec/PL.

18 PL/PL 19 BCE/UL 20 10SLInc/BCE 21 BCE/LOSLSU 22 BCE/IRT 23 BCE/BCE 24 HU-340 25 HU-200 26 HU-100 27 HU-147 28 OP-43 Sub-C cle within HUJCD Note

(. Ke factor calculation for this location is based on Total Stress. This is conseivative because the Total stress range is higher than Membrane+Bending, resulting in a lawge usage factor Prepared by:

1. Sorensen Date: 04/2007 n-*-4..

INA /nAAfl7 Page 101

NORTH ANNA UNITS 1 &2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DMUNIENT NUMBER PLAN!

A R EVA 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY Path Name SELWola (inside)

Maximum Weld Overlay Output File:

fatigueSE M+B out Node FSRF=- 4 SUBSEM+B out MATERIAL:

TYPE: High Alloy UTS (psi) 3Sm= 40.7 E mat] (psi) =

]E ratio =C'E cuive' /'E analysis')=1.14

" Salt=(M+B+Ext. Load)F SRF/2 RANGE IENTS IREQ'D M+B Ext.

Ke x ALO BEUSG RANGCYLE SI Load Ie S

alt (Eato CYCLES FACTOR Sal HU/TCDI 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 HU/RTCDSI HU/SIA HU/SUIL.

HU/CD CD/RCSD CD/RI CDnSI CRD/RrCDnSI 8 CHSD/RT CDnSI FCHSD/LOI.

10 FCHSD/RTInoCD F CHSD/RT noCD FCHSD/ILOF FCHSD/LSDL 4 F CHSD/LOSLSD FCHSD/PL PI/RCOP PL/PL lOSLdec/LOP 0OSLdec/1OSLdec BCE/UL 10SIinc/BCE BCEILOSLSU BCEI/RI BCE/BCE HU-340 HU-200 HU-100 HU-147 OP-43 r,

--,044 Prepared by:

T.. Sorensen Date: 04/2007 r)%te.- 04/9.007 Page 102

Path Name SELWelda (inside)

Minimum Weld Overlay Output File: m fatigue N2SE M+B.out Node FSRF=-4 SU9BN2SE_-+Ku MATERIAL:

TYPE: High Alloy UTS (psi) =

3Sm-- 69.9 E matl (psi) =

J E zatio =CE crave' / !E analysis)3=1 00

)Salt=--([+B+Et Load)*FSRF/2 REQ'D M+B Ext Lxa KeLSaltBLe USAGE RANGE TRANSIENTS WITH CYCLES Si Ext Loalt (E -aio CYLS F TO I

HU/LOP 2

BCE/HU 3

BCE/CD 4

BCE/RCOP 5

LOIRI_CDSI 6

LOL/SIA 7

FCHSD/RCSD 8

FCHSD/LOL 9

FCHSD/RT CDnSI 10 CRD/FC7HSD it FCHSD/LOF 12 FCHSD/LOSLSD 13 FCHSD/LSDI 14 FCHSD/RT noCD 15 1OSLdec/FCHSD 16 10SIldec/SUMt 17 10Sldec/PL 18 Pi/PL 19 IOSLinceBCE 20 BCE/LOSLSU 21 JL/IRT 22 BCE/UL.

23 BCE/BCE 24 HU-340 25 HU-200 26 HU-100 27 HU-147 28 0P-43 Sub-Cycle within HUCD Prepared by: T. Sorensen P.~uwA i,.r T

Rt"yala Date: 04/2007 rnte.- n4n0f7 Page 103

Path Name NWolb (outside)

Minimum Weld Overlay Output Files: m fatigueWOLM+B out Node fFSRF=

1 m_-SUB_WOL._M+B.out MATERIAL:

TYPE: High Alloy UTS (psi) 3Smin 69.9 E matl (psi) =

) E tatio =E curve' / 'E analysis')=l.02

.0 Salt=-(M+B+Ext. Load)*FSRF/2 REQ'D IM+B Ext I Kex ALLOWABLE USAGE RANGE tRANSIENTS WITH CYCLES SI Load Salt CE ItaiiO)

CYCLES

FACTOR I

IY CIE S

S I L o a d S a lt k si I

HU/RTCDSI 2

HU/CD 3

CD/LOP 4

LOP/RCSD 5

LOP/RCOP 6

LOSLSD/SIA 7

CRD/LOSLSD 8

CRD/PL 9

FCHSD/PIL 10 FCHSD/PL 11 PL/SUIL 12 PL/RICDnSI 13 PIJPL 14 1OSLdec/LOF 15 l0SLdec/RT noCD 16 l0SLdecITrT 17 10SLdec/ILOL 18 10SLdec/UL 19 BCE/UL 20 1OSLinc/BCE 21 BCE/LOSLSU 22 BCE/LSDL 23 BCE/BCE 24 HU-340 25 HU-200 26 HU-100 27 HU-147 28 OP-43 Sub-Cycle within HUCD Prepared by:

I.. Sorensen Date: 04/2007 Dnte- 040007 Page 104

Path Name NozL (inside)

Maximum Weld Overlay Output File:

fatigueNozzle M+B.out Node FSRF= 2 SUB._NOZ_M+B out MATERIAL:

TYPE: Low Alloy UTS (psi) =

3Smi 80.1 E matl (psi)-- L 3 Eiatlo=(EcurveE analysis')=

1.21 W t

.J Salt-(M+B+Ext. koad)*FSRF/2 REQ'D M+B Ke Salt (E io)x ALLOWABLE USAGE RANGE TRANSIENTS WITH C

LE SI CYCLES FACTOR I

E CYCLES SI S alt ksi I

fHU/SIA 2

FCHSD/HU 3

FCHSD/CD 4

LOLIRCOP 5

LOL/RCSD 6

RICDnSV!RICDSI 7

FCHSD/RTCDnSI 8

CRD/hCHSD 9

FCHSD/LOL 10 FCHSD/L.OF 11 FCHSD/RT-noCD 12 FCHSD/TRT 13 FCHSD/LSDL 14 FCHSD/ECHSD 15

]LOP/SUIL 16 I.OP/1OSLSD 17 LOSLSD/LOSLSD 18 1OSldec/PL 19 PL/PL 20 BCE/UL 21 BCE/BCE 22 10SLinc/LOSLSU 23 10SLinc/10SLinc Sub-Cycle within HUCD Prepared by:

T. Sorensen D awA%%st bkxr T Q+"VaLc Date: 04/2007 nnt,. NA/gN7 Page 105

ximum Weld Overlay Output File:

fal FSRF= 4 St TYPE: High Alloy 3Sm=

455

) E ratio - CE curve' /'E analysis'-= 1.00 Salt=(M+B+Ext. Load)*F SRF/2 tigueTSM+B.out JB rsM+B.out REQ'D M+B Ke S

r ALLOWABLE USAGE RANGE TRANSIENTS WITH YLE SI CYCLE ReFAlCTORti)

IICCLES SI Se af s CYCLES IFACTOR S alt ksi 1

RCSD/RT CDSI 2

RCSD/RCSD 3

HU/SUII_

4 RCOP/RTCDnSI 5

HU/CD 6

CD/RICDnSI 7

LOSL SD/RICDnSI 8

RI_CDnSIIRTCDnSI 9

LOF/SIA 10 FCHSD/LOF 11 CRDIFCHSD 12 FCHSD/RI noCD 13 FCHSD/IOL.

14 FCHSD/L.OP 15 FCHSD/L.SDL 16 FCHSD/PI 17 PU/PIL 18 l0SLinc/UL 19 LOSLSU/IJI 20 ULL/UL 21 l0SLdec/10SLdec 22 BCF/TRI 23 BCE/BCE Sub-Cycle within HUCD Prepared by: T. Sorensen Date: 04/2007 nn'ta÷.

nA/I)nAI7 Page 106

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCU1MENI NUSMER PIANm AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY

10. RESULTS

SUMMARY

ICONCLUSION The fatigue calculation assumes that the Surge Nozzle WOL configuration has existed fiom the beginning of'plant operation. The preceding calculations demonstrate that the design of the Surge Nozzle Maximum and Minimum Weld Overlay for the North Anna Units 1 & 2 Pressurizers has met the stress and fatigue requirements of the Design Code (Reference 13.1).

Based on the loads and cycles specified in References 13.8 and 13-16, the conservative fatigue analysis indicated th t the Pressurizer Surge Nozzle Weld Overlay design has a maximum fatigue factor off Jcompaied to the ASME Code allowed maximum value of 1.0.. Therefoie, the total usage for-the Spray Nozzle is less than the allowable value of 1.0 for the total of 60 years of operation.

Table 10-1 Summary of Results Nozzle ISafe End to Nozzle Weld Safe End Calculated {Limit ""IRtO) I Calculatedi I Limit I IR")

Calculated {Limit I RFT Primary SI Bounded by original analysis, see Section 9.1 Max. SI Range PL+Pb+Q

[ksi]

Fatigue UsageI I

I I

I Thermal Sleeve Safe End to Pipe Weld Pipe Calculated LimCalculated lt IRLimit IR Primary SI Bounded by original analysis, see Section 9.1 Max. SI Range PL+Pb+Q

[ksi]

Fatigue Usage

[

I..

I II Weld Overlay Calculated Limit I° Primary SI Bounded by original analysis, see Section 9.1 M ax. SI l'*"

Range PL+Pb+Q

[ksi]

Fatigue IUsage o

Note "): IR-Interaction Ration is defined as (Calculated Value / Limnit)

Prepared by: T. Sorensen Date: 04/2007 nthp.- ALnnifVY Page 107

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMBER PIMANT AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY

11. SOFTWARE VERIFICATION The finite element analyses documented in this repoit were performed using ANSYS vl00 software (Reference 13.10). The suitability and accuracy of use of'ANSYS vl0.0 was verified by performing the following verification runs (Table 11-1).

Table 11-1 Software Verification Files No computer output Is included with this document. The proprietary version of this document (32-9038239-000) contains computer output files which are attached to the proprietary version of this document and are available In the AREVA COLD storage system.

Prepared by:

T. Sorensen Date: 04/2007 notw iA/glfm7 Page 108

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS ADOCUMENI NUMBEM P1AN!

AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY

12. COMPUTER OUTPUT FILES For list of fi'actuie mechanics output files, see Appendix A..

For list of output files for justification of insufficient Weld Overlay length, see Appendix C.

No computer output Is Included with this document. The proprietary version of this document (32-9038239-000) contains computer output riles which ate attached to the proprietary version of this document and are available In the AREVA COLD storage system,.

Prepared by:

T.. Sorensen Date: 04/2007

'lati. 04/1007 Page 109 P -A vira I

~

iri T

Qftvatlr

A NORTH ANNA UNITS 1 &2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMBE*

PLANI AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY

13. REFERENCES 13.1 ASME Code,Section III, Division 1, "Boiler and Pressure Vessel Code", 2001 Edition including Addenda through 2003.

13.2 Not Used 13.3 Not Used 13.4 Not Used 13.5 AREVA Drawing 02-8016831C-003, "North Anna Pressurizer Surge Nozzle Design" 13.6 AREVA Drawing 02-8017167D-000, "North Anna Pressurizer Surge Nozzle Weld Overlay Design."

13.7 AREVA Document 51-9031151-002, "North Anna Pressurizer Nozzle Weld Overlays -

Technical Requirements."

13.8 AREVA Document 38-9034638-00.1, "Required Engineering Input fox North Anna Pressurizer Weld Overlays, North Anna Power Station Units 1 & 2."

13.9 ANSYS Finite Element Computer Code, Version 10.0 Help Manual 13.10 "ANSYS" Finite Element Computer Code, Version 10.0, ANSYS, Inc.. Canonsburg, Pa.

13.. 11 AREVA Document 38-9042859-000, Code Case N-740-1 (2-07-2007 IDaft), "Dissimilar Metal Weld Overlay for Repair of Class 1, 2, and 3 Items,Section XI, Division 1." (Ihis Code Case is not yet accepted by the NRC.)

13-12 "Companion Guide to the ASME Boiler & Pressure Vessel Code", Volume 1, ASME Press, New York, 2002.

13.13 John F. Harvey, "Theory and Design of Piessure Vessels," Second Edition, Van Nostran Reinhold, 1991.

13.14 AREVA Document 32-9034323-002, "North Anna Units 1 & 2 Pressurizer Weld Overlay Sizing Calculation - Surge Nozzle."

13.15 AREVA Document 51-9038545-001, "Material Properties for North Anna Units 1 & 2 Pressurizer Nozzles."

13 16 AREVA Document 51-9036969-003, "Pressurizer Bounding Transients for North Anna Units 1 & 2."

Prepared by:

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NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMEER PLANI AR EVA 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY APPENDIX A PATH STRESSES FOR FRACTURE MECHANICS Prepared by: I. Sorensen Date: 04/2007 T'htp. NA/jAn7 Page 111

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

D0CU)AN7 NUMBER.

LN AR EVA 32-9049387-000 North Anna Units 1 & 2 NON-PROPRIETARY A.1 PURPOSE The purpose of this appendix is to provide supplemental stiess and theimal results of the transient analysis for a Fracture Mechanics Analysis of'the spiay nozzle weld overlay. The focus of the analysis is ciack initiation and growth tluough both the Pipe to Safe End Weld and Nozzle to Safe End Weld. The Minimum Weld overlay represents the worst case scenario with a tluhough-weld crack, therefore only the minimum WOL is included in this appendix.

A.2 STRESS AND TEMPERATURE EVALUATION The ANSYS Post Processor is used to tabulate the stresses and tempeiatures along the predetermined paths for the Minimum Weld Overlay Configuration only. The paths are shown in Figure A-I and described in Table A-I..

The definitions of these paths and post processing commands are contained in computer output file named, NAPathSummary..out. All output files used for fiactuie mechanics evaluation are listed in Table A-2.

Table A-I Paths Description Min WOL Output File Path Name Inside Node No.

Outside Node No.

Path No.

1 SEUWELD 6244 6001 2

SELWELD 6255 6052 3

SEBUT 6297 15955 Prepared by: T - Sorensen OD,,4,,,r-tKvr.

T Q*tolra Date: 04/2007 Tntc.f nA/i1937 Page 112

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENT NUMBER KIANI AR EVA 32-9049387-000 Noith Anna Units 1 & 2 NON-PROPRIETARY r

Figure A-I Paths Defined for Fracture Mechanics Evaluation Stresses along the path line are summarized at twelve points separated by an equal distance from the inside node to the outside node. At each point, the axial (longitudinal, Sy) stress and the temperature of' the nozzle are given. The path point distances fiom the inside node ate included in the output files listed in Table A-2 with " PathLocs" in theif names.. The stress and temperature result files for these locations are listed on Table A-2..

In addition, files with "_PathDisc" in their names, listed in Table A-2, provide path point distances from the inside node including the location at the dissimilar material interface fox each path (two path points, one just before and one.just after the material discontinuity, define the

.-- location-of.the material interface),. No post processing are-obtained at. these-path points;.. this.

information is provides.for reference only....

Prepared by: 'T. Sorensen

,pwip=u,=pd hv-T.tr,.nl, Date: 04/2007 IDnf-.- 04/7007/

Page 113

Blank Page Inserted to Maintain Page Numbering Prepared by: I.. Sorensen Reviewed by: T.. Straka Date: 04/2007 Page 114 Date: 04/2007

Blank Page Inserted to Maintain Page Numbering Prepared by:

1. Sorensen Reviewed by: r. S-taka Date: 04/2007 Date: 04/2007 Page 115

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NORTH ANNA UNITS l&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENI NUMBER PI ANT AR EVA 32-9049387-000 NORIHANNAUNITS 1 &2 NON-PROPRIETARY Blank Page Inserted to Maintain Page Numbering Prepared by:

Reviewed by:

1. Sorensen I.. Straka Date: 04/2007 Date: 04/2007 Page 117

APPENDIX B STRUCTURAL TIME POINTS OF INTEREST Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 118

B.1 TIME POINTS OF INTEREST USED FOR STRUCTURAL ANALYSIS The following tables lists all transient time points analyzed in the structural analysis of'the Surge Nozzle.

The time points have been selected based on localized extreme thermal giadients tabulated at the end of all "....Dt.out" thermal post processing computer files.

The thermal extreme time points were merged with all time points defining the transients for the structural analysis.. In the following tables, those time points marked with asterisks have been taken directly fiom the transient definition; all other points represent temperature gradient extreme time points Prepared by:

T.. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 119

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMBER PlANI AR EVA 32-9049387-000 NORTH ANNA UNITS 1 &2 NON-PROPRIETARY Table B-i Structural Time Points of Interest for Plant Heatup and Cooldown-MAX WOL Press p

Time Temperature i

Time Temperature Press Time Temperature Press

[_F]_

_p__

LF]

[p j

[rF]

[psi]

0 00010*

1 22290*

1 31209 1.40128 2 11480*

4 00000*

4 00030*

404183 4.08335 4 16640*

4 16670*

7 44280*

7 44310*

748463 752615 7 60920*

7 60950*

796808 820713 8 92428 10 00000*

18 00000*

19 00000*

19 55320*

19 55324 1955333 19 55350*

1957239 1958266 1959120 19.59460*

19 59490*

20 23744 21.73670*

21 73674 21 73683 21.73700*

21 75585 21 76613 21 77468 21.77810*

21.77840*

22 54436 22.92734 23 69330*

23 69334 23 69343 23 69360*

2371239 2372780 2373125 23 73470*

23 73500*

24.15024 24.56548 25 81120*

25.81124 25 81150*

25.83022 25 84563 2584912 25.85260*

25.85290*

2631174 2669411 27 00000*

2700003 27 00010*

2700014 2700020 27 00040*

2701913 2703454 2703802 27 04150*

27 04180*

2743804 2783428 29 02300*

2902304 2902310 29 02330*

2904351 2905995 29 06440*

29-06470*

2945224 29.83978 31 00240*

31 00244 31.00250 31 00270*

3102136 31 03677 31 04029 31 04380*

31 04410*

31 54330*

31 73559 3231246 33 46620*

33 46650*

3350881 3352957 33.55033 33 63260*

33 63290*

34 38500*

34.38530*

3441852 3445174 34 55140*

34 55170*

34 87490*

34 87520*

34 87550*

35 09710*

35 09716 35 09720 35 09740*

35 40100*

40 93120*

40.93126 40 93150*

4093153 4093166 40 93180*

41 15340*

4115370*

41 76480*

42 33220*

43.00000* K Prepared by:

T.. Sorensen Date: 04/2007 Date: 04/2007 Page 120 Reviewed by: T.. Straka

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENT NUMBER PLANT AR EVA 32-9049387-000 NORTH ANNA UNITS 1 & 2 NON-PROPRIETARY Table B-2 Structural Time Points of Interest for Plant Loading and Unloading-MAX WOL Prs Press Time Temperature Press Time Temperature

[psi]

Fi EPI[psi Fp

'6 0.00010*

000013 0 00020*

0 02780*

0 03058 0.03927 0 04170*

0 04530 0 05970*

0 05980*

0 07640*

0 09720*

009894 010068 0 10852 0 11375 0 11810*

0 22780*

0 30560*

0 31368 031714 032407 0 33330*

0 33331 0 33340*

0 37500*

038888 0 44440*

044447 0 44450*

0 44460*

0 45580*

0.45840*

0 46540*

046541 046545 046549 0 46550*

047110 0 49350*

0.52160*

0.52250*

055233 058215 0.76110*

0.77610*

078622 079255 079697 0.80140*

0.84430*

084432 084432 084433 084438 0 84439 0.84440*

0.87950*

0.88570*

0 88844 0 89006 089087 089490 0.89700*

089762 0.90320*

j Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 121

Table B-3 Structural Time Points of Interest for 10% Step Load Increase-MAX WOL Time Temperature rF]

Press

[ps9 0 00010*

0 00310*

0.00421 0 00500*

0.00592 000628 0 00720*

0 00730*

0 00869 0 00910*

0 01970*

0 02140*

002313 0 02690*

003579 004376 004727 0 04880*

0 05350*

0 05360*

0 05510*

0.05558 0 05650*

0,06850 0.09250*

r

~2 Prepared by: I. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 122

Table B-4 Structural Time Points of Interest for 10% Step Load Decrease-MAX WOL Time Temperature Press

[F]

[psi]

0 00010*

0 00020*

0 00310*

0 00480*

0 00696 0 00760*

0 00770*

0 00785 0 00790*

0 00925 0.00987 001017 0 01220*

0 01240*

0 01430*

0.03203 0 04250*

0.04320 0.04690 0 04950*

0 08310*

0.08393 0.08460 0.08561 0 08680*

0.08728 0.08776 0 08982 0 09160*

0 09460*

0 09470*

009694 0.10590*

J Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 123

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMM NUMBER PIANI AR EVA 329049387000 NORIH ANNA UNITS 1 &2 NON-PROPRIETARY Table B-S Structural Time Points of Interest for Large Step Decrease In Load-MAX WOL Time Temperature Press

((0

[psi]

0 00010* "

000011 000012 000013 000015 0 00020*

0 00210*

0 00240*

000294 0 00510*

0 00520*

000619 0 00730*

0 00830' 0 00998 001358 0.01478 0 01670*

001732 001794 0,02290*

0 02353 0 02686 0 02920*

003184 0 03340' 004173 0 09590' 0 21160' 0 22720*

0 24080' 0 26890' 032624 0.55560*

Prepared by: T. Sorensen Date: 04/2007 Page 124 Reviewed by: T. Straka Date: 04/2007

Table B-6 Structural Time Points of Interest for Loss of Load-MAX WOL Time Temperature

[F] _

0.00010*

0.00020*

000180 0 00190*

0 00210*

0 00483 0 00866 0.01030" 001059 001130*

0 011406 0 01180*

001688 0 01760*

0 01850*

0 02270*

0.05376 0.33330*

Press

[psi]

Pippared by:

I, Sotensen Reviewed by: T. Stiaka Date: 04/2007 Date: 04/2007 Page 125

A NORTH ANNA UNIIS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCAUMEN NUM]BER PKAM AR EVA 32-9049387-000 NORIH ANNA UNIT'S I & 2 NON-PROPRIETARY Table B-7 Structural Time Points of Interest for Loss of Power-MAX WOL Time Temperature Press

[F]

[psi]

0.00010*

0 00020*

0 00110*

000188 0.00270*

0 00280*

0 00404 0 00420*

0 01674 001870*

0.02480*

002481 002482 002487 0.02490*

004309 004538 0.05000*

005259 0 05435 005788 0 06940*

008162 008436 008983 0 09950*

0 09960*

0 14030*

014819 0 16735 0 21920*

0 28060*

0 37620*

043387 0 49154 0 77990*

0.80690*

-7 Prepared by:

L.. Sorensen Reviewed by: 1.. Stiaka Date: 04/2007 Date: 04/2007 Page 126

Table B-8 Structural Time Points of Interest for Loss of Flow-MAX WOL Time Temperature 0 00010*

0 00020*

0 00023 0.00030 0 00070*

0.00083 0 00100*

0 00110*

000114 000118 0 00170*

000203 000217 0 00250*

0 00533 0 00930*

001047 0 01210*

0 01220*

001274 0o01400*

001588 001684 0.01840*

0 01954 0 02070*

0.02100*

Press

[PSI]

Prepaxed by: T. Sorensen Reviewed by: 1. Straka Date: 04/2007 Date: 04/2007 Page 127

A AREVA NORTH ANNA UNITS l&2. PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS I

F DOUMENI NUMBER 32-9049387-000 PLANT NORTH ANNA UNITS I & 2 NON-PROPRIETARY Table B-9 Structural Time Points of Interest for Feedwater Cycling at Hot Shutdown-MAX WOL Time Temperature

[FI 0 00010*

0 42780*

0 42790*

0 44710*

0 45432 046514 0 47055 047597 0 49040*

0 63460*

0 64410*

064415 064418 0.64420" 0.65870*

066830 087516 068887 069573 0 70670*

0 74040 1 20190*

1.24357 1 28440*

1 26450*

1 26920*

1 27724 1 28046 1 28850*

2.00000*

Press

[psi]

MN--

Prepared by:

T. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 128

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCU*M*NI N'UMB P A.NT AR EVA 32-9049387-000 NORTH ANNA UNITS I & 2 NON-PROPRIETARY Table B-10 Structural Time Points of Interest for Boron Concentration Equalization-MAX WOL Time Temperature

[I*F Press

[psi 0.00010*

000013 0.00020*

001686 0 03353 005019 1.00000*

1.00010*

Table B-Il Structural Time Points of Interest for Reactor Trip with No Cooldown-MAX WOL I I Iil Prepared by:

T. Sorensen Reviewed by: T.. Straka Date: 04/2007 Date: 04/2007 Page 129

A NORTH ANNA UNIIS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMBER PLANT AR EVA 32-9049387-000 NORTH ANNA UNITS I & 2 NON-PROPRIETARY Table B-12 Structural Time Points of Interest for Reactor Trip with Cooldown but no Safety Injection-MAX WOL Time Temperature

[r*F Press (psi]

0 00010*

0 00190*

0 00509 0 00550*

0 00750*

0 01380*

001387 001444 0 01480*

0 01500*

001588 0 01784 0 01800*

0 01810*

001818 0 01830*

002020 0.02780* k..

Table B-13 Structural Time Points of Interest for Reactor Trip with Cooldown and Safety Injection-MAX WOL Time Temperature rF]

Press

[PSI]

r r

0 00010*

000149 0 00190*

0 00537 000745 0 00953 0 01230*

0 01390*

0 01420*

0 02150*

0 02850*

0.11960 0.12947 0.13934 0.16670*

Prepared by:

I.. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 130

Table B-14 Structural Time Points of Interest for Inadvertent Reactor Coolant System Depressurization-MAX WOL Time Temperature

[OF]

Press

[psi]

0 00010*

0 00020*

0 00840*

0 00960*

000969 0.00970" 000974 0.01030*

001060 001135 001371 0 01390*

001467 0 02310*

002311 002314 0 02320*

0 02364 0 02450*

0 03220*

0 03990*

0.05990 0 27990*

028134 028483 028541 0.28630*

029301 0.33330*

Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 131

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMEN NUMBER PLANT AR EVA 32-9049387-000 NORTH ANNA UNIIS 1 &2 NON-PROPRIETARY Table B-15 Structural Time Points of Interest for Control Rod Drop-MAX WOL Time Temperature rF]

Press

[PSI]

0 00007 0 00010*

0.00016 o 00022 0 00100*

0.00266 0 00290*

000593 0 00810*

0 00870*

0 01140*

001193 0 01320*

0 01330*

001379 0 01700*

0.02710 0 02840*

003111 003331 0.03771 0 04050*

0 04140*

0 04150*

0.04183 0.04215 0.04410*

Prepared by:

Reviewed by:

T. Sorensen T. Straka Date: 04/2007 Date: 04/2007 Page 132

NORTH ANNA UNITS 1& 2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENI NUMBER P1 ANT AR EVA 32-9049387-000 NORTH ANNA UNITS I & 2 NON-PROPRIETARY Table B-16 Structural Time Points of Interest for Inadvertent Startup of an Inactive Loop-MAX WOL Time Temperature Press F6.

Ipsa Time Temperature rF]

Press

[psi]

0 00010*

0 00020*

0 00160*

0.00340*

0 00400*

0 00408 0.00410*

0.00480*

0.00510*

0.00551 0 00571 0.00580*

0 00730*

0.00770*

000870 001241 0 01270*

001323 001360 001505 0 01670*

0 01850*

0 01860*

001890 0.02010*

0.02074 0.02120 0.02211 0.02293 0 02330*

002397 002447 002597 0.02730*

002806 002899 002930 0 03070*

003104 003187 0 03410*

003488 003551 003616 0 03670*

0 03693 003716 003749 0 03900*

0.03910*

J Prepared by:

I. Sorensen Reviewed by: 1T.. Straka Date: 04/2007 Date: 04/2007 Page 133

Table B-17 Structural Time Points of Interest for Inadvertent Safety Injection Actuation-MAX WOL Time Temperature r[F 0.00010*

0.00260*

0 00466 001186 0 01340*

001341 001344 001349 0 01350*

0 01420*

001423 0 01480*

0 02780*

003411 0 03862 0 04763 005665 0 09090*

0 28620*

0 28625 0 28629 0 28630*

028841 029016 0 29080*

0.29718 0.31790 0.32398 0.33330*

r Press

[psi]

Prepared by: 1. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 134

Table B-18 Structural Time Points of Interest for Turbine Roll Test-MAX WOL Time Temperature

[Fio Press

[psi]

0 00010*

0 01510*

001868 0 03249 0 05090*

0 27780*

0 28298 0 29594 0 30372 0.31149 0.34000*

Table B-19 Structural Time Points of Interest for Loop Out of Service Normal Loop Shutdown-MAX WOL Time Temperature

[F]

0 00010*

000020*

0 00260*

000268 000372 0 00380*

0 00390*

0 00510*

0.00558 0 01090*

0 01560*

0 02362 002697 0 03633 0 03900*

004250 0 05650*

0 05660*

0 06770*

007082 007305 007528 008131 0.08330*

Press

[psi]

Prepared by: 1. Sorensen Reviewed by: T. Straka "

Date: 04/2007 Date: 04/2007 Page 135

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMNIN NUMB2r PLANT AR EVA 32-9049387-000 NORTH ANNA UNITS 1 & 2 NON-PROPRIETARY Table B-20 Structural Time Points of Interest for Loop Out of Service Normal Loop Startup-MAX WOL Time Temperature Press rFI

[psLq i

r 0 00010*

000012 0 00020*

000029 0 00130*

0 00260*

0 00270*

0.00275 0 00330*

000331 0.00340*

0 00365 0.00720W 0 01050*

001341 0 01900*

001929 001999 0 02190*

0 02200*

0.02243 0 02840*

0.05000*

007334 009001 010668 0.16670*

K

.2 Prepared by:

I. Sorensen Reviewed by: 1. Straka Date: 04/2007 Date: 04/2007 Page 136

Table B-21 Structural Time Points of Interest for RCS Cold Overpressurization-MAX WOL Time Temperature

[F]

Press

[psa 0 00010*

0 00020*

000025 0.00140*

0.00150*

0.00160*

000161 0 00170*

0 00180*

000181 0 00190*

000196 0 00200*

0 00210*

0 00220*

0.00225 0 00230*

0.00240*

0.00250V 000259 0 00260*

0 00270*

0 00280*

0 00290*

0 00300*

0 00310*

0 00320*

0 00330*

0 00340*

0 00350*

0 00360*

0 00370*

0.00380*

000385 0.00390* I Prepared by:

1. Soxensen Reviewed by: 1. Stnaka Date: 04/2007 Date: 04/2007 Page 137

Table B-22 Structural Time Points of Interest for Plant Heatup and Cooldown-MIN WOL T

DT T

D ltn*e UI.L V100rA Iime

[psi]

0 00010*

"F 0.06124 1 22290*

1 31209 2.11480*

4. 00000*

4..00030*

4.04183 4.16640*

4.16670*

4.82192 5.47714 7.44280*

7.44310*

7.48463 7 60920*

7.60950*

7 84855 796808 8 68523 10.00000*

1040000 18.00000*

18 20000 19.00000*

19 55320*

19 55350*

19.55898 1956726 1957754 1958268 19..59460*

19..59490*

19 80908 20-02326 21.73670*

21.73700*

21.74248 21.75073 21.75587 21 76100 21.77128 21..77810*

21.7'7840*

21.96989 22.16138 23.69330*

23.69360*

23.69908 Time 23.70726 23-71240 23-.71754 23.73126 23 73470*

23 73500*

23.94262 24.15024 25.39596 25 81120*

25.81150*

25 81698 25 82509 25 83023 25 83537 25..85260*

25.85290*

26.08232 26.31174 27.00000*

27,00010*

2'7,00040*

27,00588 27.01400 2701914 2702427 27.04150*

27-04180*

2723992 27.43804 28.62676 29.02300*

29.02330*

29..02741 29.03571 29.04357 29.05179 29 06440*

29 06470*

2925847 2945224 3022732 3061486 31.00240*

31-00270*

31 00818 31.01623 31-.02137 31.02651 1VLIXIJ

[OF]

[psi)

Time 31 04380*

31 04410*

31.06906 31 54330*

31 92788 33..46620*

33-46626 33.46630 33.46650*

33.50913 33.63260*

33 63290*

33..85853 34.38500*

3438503 34.38509 34..38530*

3441852 34.,55140*

34.,55170*

34.74562 34.87490*

34.87520*

34.87526 34.87529 34.87550*

34 96539 35.09710*

3509716 35.09740*

35.3,7832 35.40100*

36.50704 40.93120*

40.93123 40.93126 40.93130 40 93150*

40-93180*

40 97612 41..15340*

41.15356 41.15370*

41.39814 41.76480*

41.99176 42 33220*

43.00000*

[*f]

[psi]

k'.

Prepared by:

I.. Sorensen Reviewed by: I.. Strnka Date: 04/2007 Date: 04/2007 Page 138

Table B-23 Structural Time Points of Interest for Plant Loading and Unloading-MIN WOL Time Temperature 10F1 Press

[psi]

Time Temperature

[OF]

Press

[psi]

I g

0.00010*

0.00015 0.00020*

0.00572 0.02283 0.02780*

0.03336 0.041'70*

0.05970*

0..05980*

0.07087 0.07640*

0.09720*

0.09894 0.10330 0.11810*

0.22780*

0.23428 0..30560*

0.31022 0.31368 0.31714 0..33330*

0 33331 0..33340*

0.34033 0.37500*

0.44440*

0.44443 0A4450*

0.44460*

0..45580*

0,45840*

0.46124 0 46540*

046549 0 46550*

0 49350*

0 50236 0 52160*

0 52250*

055233 062192 0.76110*

0-77610*

078116 0 78622 079255 0.80140*

0.84430*

0-84432 0.84432 0..84433 0.84438 0.84440*

0.86646 0 87950*

0.88012 0 88570*

0 88844 0.88925 0 89006 0.89167

0. 89700*

089762 0 89824 0.90320*

K J

Prepared by:

I, Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 139

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS ADOCUENT NUMBER PLAN]

AR EVA 32-9049387-000 NORTH ANNA UNITS 1 & 2 NON-PROPRIETARY Table B-24 Structural Time Points of Interest for 10% Step Load Increase-MIN WOL Time 0 00010*

0.00310*

0 00421 0.00500*

000528 0 00628 0.00720*

0.00730*

0.00910*

0-01437.

0.01970*

0.02140*

0.02263 0 02690*

0.02836 0.02982 0.04880*

0.05350*

0..05360*

0..05510*

0 05558 0.05650*

0.06850 0..08050 0.09250*

Temperature (OF]

Press

[psi]

Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 140

Table B-26 Structural Time Points of Interest for 10% Step Load Decrease-MIN WOL Press Time Temperature

[OFl

[psi]

0 00010*

0 00020*

0 00310*

0 00441 0 00480*

0 00760*

000768 0 00770*

000785 0 00790*

0 01220*

0 01240*

0 01430*

002800 003605 0 03928 0.04250" 0 04950*

0 08310*

008359 0.08393 0.08460 0 08680*

0.08728 009050 0 09160*

0 09460*

0 09470*

009694 0.10590*

i_"ý j

Prepared by:

Y.. Sorensen Reviewed by: T.. Straka Date: 04/2007 Date: 04/2007 Page 141

Table B-26 Structural Time Points of Interest for Large Step Decrease In Load-MIN WOL Time Tempexature f°_F]

press

[psi]

0 00010*

0.00011 0.00012 0.00013 0 00020*

0 00210*

0 00240*

0.00294 0.00329 0.00510*

0.00520*

0.00730*

0..00830*

000914 0 00998 001358 001616 0 01670*

001732 0.01*794 0.01856 0 02290*

0.02686 0 02920*

0 03340*

0.09590*

0.21160*

0.22720*

0.22856 0.24080*

0 26007 0.26890*

0.32624 0.55560*

F Prepared by: T. Sozensen Reviewed by: T. Stuaka Date: 04/2007 Date: 04/2007 Page 142

Table B-27 Structural Time Points of Interest for Loss of Load-MIN WOL rime Temperature

[OF]

Press

[psi]

0.00010" 000012 000014 0.00020*

000170 0o00190*

0.00210*

0 00702 0.00866 0.01030*

0,01130*

0,01140*

0.01180*

0..01398 0 01760*

0.01775 0.01798 0 01850*

0 02270*

0.05376 0.08482 0.33330*

Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 143

Table B-28 Structural Time Points of Interest for Loss of Power-MIN WOL Time Temperature

[OF]

Press

[psi]

0.00010*

000014 0..00020*

0-00110*

000188 0 00270*

0 00280*

0 00294 0.00308 0 00420*

0 00783 0.01674 0 01870*

0 02480*

0.02484 0.02485 0 02490*

0.02825 0.04081 0.04309 0.04765 0 05000*

0 06940*

0.07341 0.08162 0.08436 0.08710 0 09950*

0 09960*

0-10774 0 14030*

0.14819 0 21920*

0.28060*

0.35435 0 37620*

0.77990*

0.79709 0.80690*

9 Prepared by: I. Sorensen Reviewed by: 1. Stiaka Date: 04/2007 Date: 04/2007 Page 144

Table B-29. Structural Time Points of Interest for Loss of Flow-MIN WOL Time Temperature

[OF]

Press

[psi]

H m

0 00010*

0 00020*

0 00070*

000083 0 00100*

0 00110*

000118 0 00140 0 00170*

0 00203 000217 0.00250*

0.00420 0.00533 0.00930*

0-01012 001117 0.01210*

0.01220*

0.01400*

0.01610 0.01685 0.01716 0 01840*

0 02070*

0.02100*

I Prepared by:

T., Sorensen Reviewed by: TI. Straka Date: 04/2007 Date: 04/2007 Page 145

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENI NUMBER PLANI ARE VA 32-9049387-000 NORTH ANNA UNITS I & 2 NON-PROPRIETARY Table B-30 Structural Time Points of Interest for Feedwater Cycling at Hot Shutdown-MIN WOL Time Tempeature

[OF]

Pius

[psil 0 00010*

0 42780*

0 42790*

0.43310 0 44710*

0.45071 0.45432 0.45973 0.48138 0.49040*

0..63460*

0..64410*

064415 0.64420*

065141 0.65870*

066350 066830 067516 0.70670*

0.74040*

095137 120190*

1.22013 1..24357 1 26440*

126444 1 26450*

1 26920*

1.27403 127724 128046 128368 1 28850*

1.43080 2.00000*K Prepared by:

I. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 146

Table B-31 Structural Time Points of Interest for Boron Concentration Equalization-MIN WOL Time Tempezature

[F]

Press

[psi]

0.00010*

000014 0-00020*

001686 003353 007400 100000*

1.00010*

Prepared by:

T. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 147

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENT NUMBER PLANM AR EVA 32-9049387-000 NORTH ANNA UNITS 1 &2 NON-PROPRIETARY Table B-32 Structural Time Points of Interest for Reactor Trip With No Cooldown-MIN WOL Time Temperature Pss rOV7

[psi]

Prepared by:

T. Sorensen Reviewed by: T. Stiaka Date: 04/2007 Date: 04/2007 Page 148

Table B-33 Structural Time Points of Interest for Reactor Trip with Cooldown but no Safety Injection-MIN WOL Time Temperature

[O1F Press

[psi]

0.00010*

0_00190*

0 00226 0 00509 0.00550*

0.00750*

0.01380*

0.01387 0 01480*

0 01500*

0.01588 001767 0.01800*

0.01810*

001818 0.01830*

0.02780* k'...

Prepared by:

T. Sorensen Reviewed by: I. Straka Date: 04/2007 Date: 04/2007 Page 149

Table B-34 Structural Time Points of Interest for Reactor Trip with Cooldown and Safety Injection-MIN WOL re~ss Time Tempexature ress

[F]

[psi]

II III 0.00010*

000133 0'.00190*

0 00259 0 00606 000745 0.01230*

0.01390*

0.01420*

0.01481 002150*

0 02850*

011149 0.11974 0 12961 0.16670*

J Prepared by:

T.. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 150

Table B-35 Structural Time Points of Interest for Inadvertent Reactor Coolant System Depressurization-MIN WOL lime Tempenature

[°O1 Press

[psi]

m m

F 000007 0.00010*

000012 000012 0..00020' 000353 0_00840*

0-00960*

000961 000962 0.00970*

0 00974 000989 0-01030*

0.01180 001371 0..01390*

0.02310*

002313 0.02320*

0.02450*

0.02714 0.03220*

0.03990*

0.16990 027990*

0.28483 0.28541 028630*

0.33330*

.0ý Prepared by:

1'.. Sorensen Reviewed by: L.. Staka Date: 04/2007 Date: 04/2007 Page 151

SURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENI NUMBE 32-9049387-000 PLANT NORIH ANNAUNIIS1I& 2 NON-PROPRIETARY Table B-36 Structural Time Points of Interest for Control Rod Drop-MIN WOL Time Temperature 1orm Press

[psi]

0.00010*

0.00100*

000266 0 00290*

0 00507 0.00810*

0 00870*

0 01140*

001193 001238 0.01320*

0.01330*

0 01700*

001814 002579 0 02840*

0 03111 0 03221 0 04050*

0 04140*

0.04150*

004183 004215 0.04410*

K Piepared by:

L.. Sorensen Reviewed by: T.. Stiaka Date: 04/2007 Date: 04/2007 Page 152

A NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS DOCUMENT NUMBER MAXI AR EVA 32-9049387-000 NORTH ANNA UNIIS 1 & 2 NON-PROPRIETARY Table B-37 Structural Time Points of Interest for Inadvertent Startup of an Inactive Loop-MIN WOL Time Temperature

[OF]

Press

[psi]

I 0..00010*

0.00020*

0.00160*

0.00340*

0.00400*

0.00401 0.00410*

0.00442 0 00480*

0 00510*

0.00571 000580*

0 00730*

0 00770*

0 00870 001013 0.01270*

001323 0.01360 0.01642 0.01670*

0,01850*

0.01860*

0.01875 0 02010*

0.02120 002211 0 02330*

002397 0.02730*

0 02806 002930 0.03070*

0.03187 0.03324 0.03410*

0..03486 0.03583 0 03670*

0.03716 0.03749 0 03900*

0.03910*

Prepared by:

T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 153

Table B-38 Structural Time Points of Interest for Inadvertent Safety Injection Actuation-MIN WOL T1me Temperature J°FI Press

[psi]

0.00010*

000186 0..00260*

0 00466 001243 0.01340*

001349 0.01350*

0.01420*

0.01480*

0.01889 0.02780*

003096 0-.03411 003862 0..04312 0.09090*

0.14992 0.28620*

0..28625 0 28630*

0.28648 0.28841 028991 029016 0 29080*

0.30882 0.33330*

/0' Prepared by:

1. Sorensen Reviewed by: T. Straka.

Date: 04/2007 Date: 04/2007 Page 154

NORTH ANNA UNITS 1&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS A

DOCUMENT NUMER PLANI AR EVA 32-9049387-000 NORTH ANNA UNITS 1 & 2 NON-PROPRIETARY Table B-39 Structural Time Points of Interest for Turbine Roll Test-MIN WOL Time Temperature

[OF]

Press

[psi]

0.00010*

0.00319 0.01510*

0.01868 0 02226 0 02737 0 04272 0 05090*

0 27780*

0.28298 0.28817 0.34000*

Prepared by: T. Soiensen Reviewed by: T. Sttaka Date: 04/2007 Date: 04/2007 Page 155

Table B-40 Structural Time Points of Interest for Loop Out of Service Normal Loop Shutdown-MIN WOL Time Temperature

[0DJ 0 00010*

0 00020*

0 00260*

0.00268 0.00372 0 00380*

0 00390*

0.00439 0 00510*

0 01090*

0 01560*

0.02362 0.03031 0 03900*

0 05650*

0 05660*

0.06514 0 06770*

0.07082 0.07305 0.07528 0.08330*

[psi]

Prepared by: 1. Sorensen Reviewed by: T. Stiaka Date: 04/2007 Date: 04/2007 Page 156

Table B-41 Structural Time Points of Interest for Loop Out of Service Normal Loop Startup-MIN WOL Time Temperature

[OF1 0_00007 0,00010*

0.00012 0.00020*

0.00130*

0.00260*

0.00270*

0..00275 0..00310 0.00330*

0..00331 0.00340*

0..00365 0.00391 0..00460 0.00720*

0..00753 0.01050*

0.01220 0.01341 0..01803 0.01900*

0.02190*

0.02200*

0.02840*

0.03272 0.05000*

0.06167 0,07334 0.16670*

[psi]

I Prepared by: T. Sorensen Reviewed by: I. Staka Date: 04/2007 Date: 04/2007 Page 157

Table B-42 Structural Time Points of Interest for RCS Cold Overpressurization-MIN WOL Time Temperature

[0F]

Press

[ps!I 0.00010*

0.00020*

000025 0 00030 0 00140*

0 00150*

0 00160*

0 00170*

0 00180*

0.00181 0.00190*

000194 0..00200*

0.00210*

0 00220*

0 00230*

0 00240*

0 00250*

0,00260*

0.00270*

000277 0.00280*

0 00289 0.00290*

0.00300*

0 00310*

0 00320*

0 00330*

0 00340*

0.00350*

0.00351 0.00360*

0.00370*

0..00380*

0.00390* K Prepared by: I.. Sorensen Reviewed by: L.. Straka Date: 04/2007 Date: 04/2007 Page 158

APPENDIX C JUSTIFICATION OF INSUFFECIENT LENGTH OF WELD OVERLAY Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Date: 04/2007 Page 159

NORIH ANNA UNITS I&2, PRESSURIZER SURGE NOZZLE WELD OVERLAY ANALYSIS1 A

DOCUMENI NUMBER PLMI AR EVA 32-9049387-000 NORTH ANNA UNITS I & 2 NON-PROPRIETARY C.1 PURPOSE The purpose of this Appendix is to examine stress distribution in the North Anna Surge Nozzle components and to justify the deficient length of weld overlay on the nozzle side as it is calculated in Reference 13.14..

C.2 ANALYTICAL METHODOLOGY By AREVA Document 38-9042859-000, Reference 13.11, the length of the weld overlay should extend at least 0.7504(Rt,) beyond each end of the observed crack, where R and t, are the outside radius and nominal wall thickness of the pipe prior to depositing the weld overlay. This requirement is to make sure that enough length is provided to attenuate stresses in case of stress concentration due to crack initiation. Because of the existing short length of the Surge Nozzle analyzed in the main body of this document, the above requirement was not satisfied and therefore shorter length for the weld overlay was used.. The main focus of this Appendix is to look closely at the stress distribution for the Surge Nozzle thin weld overlay configuration under the conservative assumption of the total loss of buttering and weld between nozzle and safe end.

For this sake the finite element model for the thin weld overlay created in the main body of' this document was tested under design pressure and external applied loads listed in Tables 6-7 through 6-9, Reference 13.16. The dead weight loads were taken firom Table I of' Reference 13.14. All the elements pertain to the weld and buttering between the safe end and nozzle body were eliminated. The modified geometry for this analysis is documented in these files:

NASNWOLGeo2.out and GeoWBmin mac (Table 12-1). Also, it is important to note that since the model created in the main body of this document uses 2-D axisymmetric elements and some of the applied external loads ate non-axisymmetric, special 2-D elements were needed to address this issue. Consequently, all the elements were changed to PLANE 83 which allows the application of non-axisymmetric loads on an axisymmetric model. The detailed description of' this element is listed in ANSYS Manual, Reference 13.9.

C.3 BOUNDARY CONDITIONS Ihe geometric boundary conditions for the model remained the same as it is described in the main body of this document. The external loads are conservatively assumed to be applied at the top of the external pipe and their application to the model is described as follows:

First, unit loads are applied on the model, and in the second step, the unit loads ate scaled and combined such that they are representative of the different external loads (DW, Design Piessute, Thermal (TH), and OBE) reported in Reference 13.16, Tables 6-7 through 6-9.. Five different unit load cases are evaluated for the thin weld overlay configuration 1) Unit, I kip, axial load, 2) Unit, I kip-in, torsion, 3) Unit, 1 kip, shear, 4) Unit, 1 kip-in, bending, 5) Unit, 1 ksi, pressure. All unit loads are applied at the end of the modeled external surge piping with an exception ofthe unit pressure load applied on the internal surfaces.

The unit axial, unit torsion and unit pressure load cases can be represented by the constant term ofa harmonic function series in particular the Fourier series, Reference 13.9. The unit shear and unit bending load cases can be represented by the first harmonic, either symmetric cosine or antisymmetric sine function of the Fourier series Reference 13.9.. While the unit bending moment can be described by a single harmonic load applied perpendicular to the cross section, the unit shear. uniform lateral load *is composed of two harmonic components applied in two Prepared by:

1. Sorensen Date: 04/2007 Page 160 Reviewed by: T. Straka Date: 04/2007

perpendicular directions in the plane of the cross section, Reference 13.9.. Since all load cases considered can be exactly represented by either the constant or first harmonic terms of the Fouiier series, no Fouier series expansion of the non-axisymmetric loads is necessary. Ihe ANSYS output of the unit external loads is contained in the output file NASNWOLExtLoad2.out.

Due to the axisymmetry of the geometries only two load combinations need to be defined for each model (DW + Design Piessure + TH + OBE) and (DW + Design Pressure + TH - OBE).

The shear-and bending moment components are combined using the square loot of the sum of the squares F s= I(F4 + F, ) and for moment Mb= (M + M) and since the first load combination produces higher-stresses the stiess intensity contour plot for this load combination is shown in Figure C-1.. It is important to mention that the axial load here is considered to be Fy aligned to the axis of' axisymmetiy y. The stress output for the aforementioned load combinations is contained in output file NASNWOLCombload2.out CA RESULTS AND CONCLUSIONS It is clear fiom Figure C-1 that the existing length of the weld overlay provides enough material to attenuate the stresses (due to design pressure and external loads) effectively. It is important to note that the comparison with ASME Code limits are documented in the main body of this document and this Appendix is intended to only verifý the stress attenuation under conservative assumption of losing the entire weld between safe end and nozzle No computer-output Is Included with this document. The proprietary version of (32-9038239-000) contains computer output fides which are attached to the proprietary document and are available In the AREVA COLD storage system.,

this document version of this Prepared by:

Reviewed by:

T. Sorensen T. Straka Date: 04/2007 Date: 04/2007 Page 161

Figure C-I Stress Intensity Contour for the Thin Weld Overlay Configuration Prepared by: T. Sorensen Reviewed by: T. Straka Date: 04/2007 Page 162 Date: 04/2007

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