L-MT-12-056, WCAP-17549-NP, Rev. 0, Monticello Replacement Steam Dryer Structural Evaluation for High-Cycle Acoustic Loads Using ACE

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WCAP-17549-NP, Rev. 0, Monticello Replacement Steam Dryer Structural Evaluation for High-Cycle Acoustic Loads Using ACE
ML12207A545
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 05/31/2012
From:
Westinghouse
To:
Office of Nuclear Reactor Regulation
References
L-MT-12-056, TAC MD9990 WCAP-17549-NP, Rev 0
Download: ML12207A545 (87)
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L-MT-12-056 ENCLOSURE 12 WESTINGHOUSE REPORT WCAP-17549-NP, REVISION 0 MONTICELLO REPLACEMENT STEAM DRYER STRUCTURAL EVALUATION FOR HIGH-CYCLE ACOUSTIC LOADS USING ACE 82 pages follow

Westinghouse Non-Proprietary Class 3 WCAP-17549-NP May 201 2 Revision 0 Monticello Replacement Steam Dryer Structural Evaluation for High-Cycle Acoustic Loads Using ACE Westinghouse

WESTINGHOUSE NON-PROPRIETARY CLASS 3 WCAP-17549-NP Revision 0 Monticello Replacement Steam Dryer Structural Evaluation for High-Cycle Acoustic Loads Using ACE Robert Theuret*

Acoustic and Structural Analysis Gary Plonczak*

Acoustic and Structural Analysis David Suddaby*

Acoustic and Structural Analysis May 2012 Approved: David Forsyth*, Manager Acoustic and Structural Analysis

  • Electronically approved records are authenticated in the electronic document management system.

Westinghouse Electric Company LLC 1000 Westinghouse Drive Cranberry Township, PA 16066

© 2012 Westinghouse Electric Company LLC All Rights Reserved

WESTINGHOUSE NON-PROPRIETARY CLASS 3 iii Table of Contents IINTRODUCTION ........................................................................................................................ 1-1 2 M ETHODOLOGY ....................................................................................................................... 2-1 2.1 OVERVIEW .................................................................................................................... 2-1 2.2 DESIGN REQUIREM ENTS ....................................................................................... 2-1 2.2.1 [ ]asC ........................................................................ 2-1 2.2.2 Young's M odulus Correction .............................................................................. 2-1 2.2.3 [ ]. .................................................................. 2-1 2.3 DRYER G EOM ETRY .................................................................................................. 2-1 3 FIN ITE ELEM ENT M ODEL DESCRIPTION ............................................................................ 3-1 3.1 STEAM DRYER GEOM ETRY ....................................................................................... 3-1 3.2 FINITE ELEMENT MODEL MESH AND CONNECTIVITY ...................................... 3-2 3.2.1 Vane-Bank Representation .................................................................................. 3-2 3.2.2 Lifting Rod Representation ............................................................................ 3-3 3.2.3 Dryer Skirt Subm erged in W ater ......................................................................... 3-3 4 M ATERIAL PROPERTIES .......................................................................................................... 4-1 4.1 STRUCTURA L DAM PING ....................................................................................... 4-1 5 M ODAL ANA LY SIS .................................................................................................................... 5-1 6 LOAD APPLICATION ................................................................................................................. 6-1 7 STRUCTURA L AN ALYSIS ........................................................................................................ 7-1 7.1 HA RM ON IC AN ALYSIS ............................................................................................ 7-1 7.1.1 [c ........................................................................... 7-1 7.1.2 Overview - Tim e-History Solution ..................................................................... 7-2 7.1.3 Inverse Fourier Transform .................................................................................. 7-3 7.1.4 Frequency Scaling (Shifting) .............................................................................. 7-3 7.2 POST-PROCESSIN G ...................................................................................................... 7-4 7.2.1 Prim ary Stress Evaluation ................................................................................... 7-4 7.2.2 Alternating Stress ................................................................................................ 7-4 7.3 CALCULATING AND EVALUATING WELD STRESSES .......................................... 7-5 7.3.1 Detailed Fillet W eld Calculations ....................................................................... 7-5 7.3.2 Calculating and Evaluating W eld Stresses [1,C ...................... 7-7 7.4 [ A,C ................................... 7-9 8 ANALYSIS RESULTS ................................................................................................................. 8-1 8.1 GLOBAL M ODEL .......................................................................................................... 8-1 8.2 [ ]1'C .................................................................... 8-1 8.2.1 [c .............................................................................. 8-1 WCAP- I7549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 iv 8.3 [ ],. ............................................................. 8-1 8.3.1 [ ]a,c ................................................................ 8-1 9 SUM M A RY OF RESULTS AN D CON CLU SION S .................................................................... 9-1 10 REFEREN CES ........................................................................................................................... 10-1 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 V WESTINGHOUSE NON-PROPRIETARY CLASS 3 V LIST OF TABLES Table 4-1 Sum m ary of M aterial Properties ...................................................................................... 4-2 Table 8-1 Stress Results for 98% of CLTP Conditions .................................................................... 8-3 Table 8-2 Stress Results for EPU Conditions .................................................................................. 8-5

]a~C for 98% of CLTP .................................... 8-7 Table 8-3 Table 8-4 [ ]a~Cfor EPU ................................................... 8-7 Table 9-1 Sum m ary of Results: 98% of CLTP Conditions .............................................................. 9-2 Table 9-2 Sum m ary of Results: EPU Conditions ............................................................................. 9-3 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 vi LIST OF FIGURES Figure 1-1 Schematic of M onticello Replacem ent Steam Dryer ....................................................... 1-2 Figure 2-1 Geom etry Plot: Overall Dryer .......................................................................................... 2-2 Figure 2-2 Geom etry Plot: Cut-Away View ...................................................................................... 2-3 Figure 2-3 Geom etry Plot: Dryer Hoods ........................................................................................... 2-4 Figure 2-4 Geom etry Plot: Skirt and Drain Region ........................................................................... 2-5 Figure 2-5 Geom etry Plot: One-Eighth Sector .................................................................................. 2-6 Figure 2-6 Geom etry Plot: Dryer Vane-Bank Region ....................................................................... 2-7 Figure 2-7 Geom etry Plot: [ ]a~c ............................................................... 2-8 Figure 2-8 Geom etry Plot: [ ]a,c ........................................................ 2-9 Figure 3-1 Overall Geometry of the Monticello Replacement Steam Dryer Model ......................... 3-4 Figure 3-2 Lower [ ],ac ...................................................................................................... 3-5 Figure 3-3 Lower [ ]ac ...................................................................................... 3-6 Figure 3-4 Vane-Bank Structural Com ponents .................................................................................. 3-7 Figure 3-5 Vane-Bank Geom etry ....................................................................................................... 3-8 Figure 3-6 Dryer Hood Geom etry ..................................................................................................... 3-9 Figure 3-7 Skirt Geom etry ............................................................................................................... 3-10 Figure 3-8 ]ac ....................................................... 3-11 Figure 3-9 ] ,c..................................................................... 3-12 Figure 3-10 [ ]c ..................................................................... 3-13 Figure 3-11 Lifting Rod Geom etry .................................................................................................... 3-14 Figure 3-12 [ . c............................................................................................ 3-15 Figure 3-13 [a ......................................................................................... 3-16 Figure 3-14 [ ]aC .................... 3-17 Figure 3-15 [ ]a, c ................................................................. 3-18 Figure 3-16 [ ]a ................................................. 3-19 Figure 3-17 Structural Com ponents of Vane Bank ............................................................................ 3-20 Figure 3-18 N on-Structural Com ponents of Vane Bank .................................................................... 3-21 Figure 3-19 Vane-Bank M ass Blocks ................................................................................................ 3-22 Figure 3-20 Tie Rod Connection between M ass Blocks and End Plates ........................................... 3-23 Figure 5-1 M odal Analysis: [ . P. .................................................................................... 5-2 Figure 5-2 M odal Analysis: [ a. ....................................................................................... 5-3 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 vii Figure 5-3 Modal Analysis: [.... ................................................................................ 5-4 Figure 5-4 Modal Analysis: [ ]C........................................................................... .. 5-5 Figure 5-5 Modal Analysis: [ .................................................................................... 5-6 Figure 5-6 Modal Analysis: [ ]a, .................................................................. 5-7 Figure 5-7 Modal Analysis: [ ]ac ...................................................................... 5-8 Figure 5-8 Modal Analysis: [ ]a,c............................................................................ 5-9 Figure 6-1 Helmholtz Acoustic Model .............................................................................................. 6-3 Figure 6-2 Three-Dimensional Views of the Acoustic Model ........................................................... 6-4 Figure 6-3 ACE and FEM Global Coordinate System Layout, Top View ........................................ 6-5 Figure 6-4 ACE and FEM Global Coordinate System Layout, Section View ................................... 6-6 Figure 7-1 [ ]a,c ............................................................... 7-10 Figure 8-1 []a' ............................................................... 8-8 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 viii Executive Summary A high-cycle fatigue evaluation of the Westinghouse replacement steam dryer for the Monticello plant has been completed with loads generated using acoustic circuit enhanced (ACE) Rev. 1. Acoustic loads and stresses for 98% of current licensed thermal power (CLTP) and 100% of extended power uprate (EPU) conditions have been evaluated for high-cycle fatigue and have been determined to meet the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code Section II, Subsection NG criteria.

The results from these analyses indicate that for the Monticello replacement steam dryer at EPU operation, the minimum high-cycle fatigue stress ratio anywhere on the steam dryer is [ pc and occurs on the [ 1ac These results account for all the end-to-end biases and uncertainties in the loads model and finite element analysis. [

]ac.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 ix LIST OF ABBREVIATIONS Abbreviation Description ACE acoustic circuit enhanced ASME American Society of Mechanical Engineers B&PV boiler and pressure vessel BWR boiling water reactor CG center of gravity CLTP current licensed thermal power EPU extended power uprate FEM finite element model FSRF fatigue strength reduction factor IFT inverse Fourier transform MSL main steam line RG Regulatory Guide SCF stress concentration factor 2-D two-dimensional 3-D three-dimensional Trademark Note:

ANSYS, ANSYS Workbench, CFX, AUTODYN, and any and all ANSYS, Inc. product and service names are registered trademarks or trademarks of ANSYS, Inc. or its subsidiaries located in the United States or other countries.

WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 1-1 1 INTRODUCTION In 2002, after increasing power to 117% of the original licensed thermal power, the steam dryer in a boiling water reactor (BWR) experienced a series of structural failures. After extensive evaluation by various industry experts, the root cause of the dryer failures was determined to be acoustic fluctuating pressure loads on the dryer, resulting from resonances produced by steam flow in the main steam lines (MSLs) across safety and relief valve inlets. The failures in the steam dryer of a BWR led to changes in Regulatory Guide (RG) 1.20, requiring plants to evaluate their steam dryer before any planned increase in power level.

The Monticello power plant has contracted Westinghouse for a replacement steam dryer and is also planning a power uprate. In conjunction with the component replacement by Monticello and the planned power uprate, an analysis has been performed to qualify the replacement steam dryer, shown in Figure 1-1, for acoustic pressure loads. The process used to perform the analysis involves [

]"C Structural qualification of the replacement dryer for the remaining duty cycle of events applicable to the Monticello operating system is documented in Reference 1.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 1-2 ac Figure 1-1 Schematic of Monticello Replacement Steam Dryer WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-1 2 METHODOLOGY 2.1 OVERVIEW An analysis has been performed to assess the structural integrity of the replacement dryer for the Monticello plant subject to acoustic loads.

la,c 2.2 DESIGN REQUIREMENTS 2.2.1 1 Ia,c The replacement dryer is analyzed according to the 2004 Edition of the ASME B&PV Code, Subsection NG (Reference 2). This report documents the suitability of the replacement dryer for high-cycle fatigue loads resulting from acoustic loads. The governing criterion for the analysis is in terms of the allowable component fatigue usage. The objective of this analysis is to show that the maximum alternating stress intensity anywhere in the dryer is less than the material endurance strength at 10" cycles. The applicable fatigue curve for stainless steel (the dryer is manufactured from SS316L), is shown in Figure 1-9.2.2 in Appendix I of the ASME Code. The evaluation of the replacement steam dryer for non-acoustic loads is documented in Reference 1.

[

]a~c 2.2.2 Young's Modulus Correction Before comparing the maximum alternating stress intensity to the ASME Code endurance strength, it is necessary to account for the Young's modulus correction. The analysis uses a Young's modulus of 25.425 x 106 psi, compared to the value to construct the fatigue curves of 28.3 x 106 psi. The ratio that is applied to the calculated alternating stress intensities is 1.113 (i.e. 28.3 / 25.425).

2.2.3[ IC

[

ac 2.3 DRYER GEOMETRY Plots showing various aspects of the dryer configuration are provided in Figure 2-1 through Figure 2-8.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-2 a,c Figure 2-1 Geometry Plot: Overall Dryer WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-3 a,c Figure 2-2 Geometry Plot: Cut-Away View WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-4 a,c Figure 2-3 Geometry Plot: Dryer Hoods WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-5 a,c Figure 2-4 Geometry Plot: Skirt and Drain Region WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-6 a,c Figure 2-5 Geometry Plot: One-Eighth Sector WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-7 ac Figure 2-6 Geometry Plot: Dryer Vane-Bank Region WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-8 ac Figure 2-7 Geometry Plot: ]I~C V

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 2-9 ac Figure 2-8 Geometry Plot: I Iaxc WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-1 3 FINITE ELEMENT MODEL DESCRIPTION 3.1 STEAM DRYER GEOMETRY The Monticello replacement steam dryer FEM, generated using the ANSYS computer code', is shown in Figure 3-1. The model consists primarily of[

a,C

[

TdsC The dryer structure includes

]a,c.

The [

pac Figure 3-11 shows the lifting rod arrangement. Figure 3-12 and Figure 3-13 show details of the hood mesh. Note that the different colors in all of the figures represent different dryer components based on either plate thickness or function. These components can be selected for individual post processing.

The analysis qualification of the Monticello replacement steam dryer was performed using the ANSYS computer code, Release 11, Service Pack 1.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-2 3.2 FINITE ELEMENT MODEL MESH AND CONNECTIVITY The dryer plates are all modeled Ta,n The vane bank[

]a,c.

II

],c are shown in Figure 3-16.

3.2.1 Vane-Bank Representation The vane bank modules are box-like structures with many internal hanging chevrons.

]afC and are shown in more detail in Figure 3-17.

The perforated plates [

ac are shown in Figure 3-18.

Also shown in Figure 3-18 are the [

]a,.

The vane bank [

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-3 are shown in Figure 3-14.

3.2.2 Lifting Rod Representation The lifting rod is modeled are shown in Figure 3-16.

3.2.3 Dryer Skirt Submerged in Water The dryer skirt is partially submerged in water. The skirt and drain channel components are separated into groups above and below the water line. The acoustic loading is only applied to elements above the water line. The material density for the stainless steel below water has been adjusted to account for the effect of the hydrodynamic mass.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-4 a,c Figure 3-1 Overall Geometry of the Monticello Replacement Steam Dryer Model WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-5 a,c Figure 3-2 Lower I Ia,C WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-6 a,c Figure 3-3 Lower I Ia,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-7 a,c Figure 3-4 Vane-Bank Structural Components WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-8 a,c Figure 3-5 Vane-Bank Geometry WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-9 a,c Figure 3-6 Dryer Hood Geometry May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-10 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-10 a,c Figure 3-7 Skirt Geometry May 2012 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-11 a,c Figure 3-8 [ ]a,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3 -12 ac Figure 3-9 [ IIC WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-13 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-13 a,c Figure 3-10 1 Ia,c WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-14 a,c Figure 3-11 Lifting Rod Geometry WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-15 ac Figure 3-12 1 1a, c May 2012 WCAP- 17549-NP WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-16 a,c Figure 3-13 1 Ia,c May 2012 WCAP- 17549-NP WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-17 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-17 a,c Figure 3-14 1 ]a, C May 2012 WCAP- 17549-NP WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-18 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-18 ac Figure 3-15 I 1a, C May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-19 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-19 ac Figure 3-16 1 Ia,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-20 ac Figure 3-17 Structural Components of Vane Bank WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-21 a,c Figure 3-18 Non-Structural Components of Vane Bank WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-22 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-22 a,c Figure 3-19 Vane-Bank Mass Blocks May 2012 WCAP- 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-23 WESTINGHOUSE NON-PROPRIETARY CLASS 3 3-23 a,c Figure 3-20 Tie Rod Connection between Mass Blocks and End Plates May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-1 4 MATERIAL PROPERTIES A summary of the material properties used in the structural analysis is summarized in Table 4-1. Material properties are taken from the ASME Code, Reference 4, for SS316L at a temperature of 575°F. The density of the skirt material below the water is increased to account for hydrodynamic effects of the water.

The perforated plates, located at the entrance to the vane banks, are modeled with equivalent plate properties to account for the reduced stiffness and mass of the plates. The density of the solid block representation of the vane banks is adjusted to achieve the correct overall mass of each vane bank.

4.1 STRUCTURAL DAMPING Structural damping is defined as 1% of critical damping for all frequencies. This damping is consistent with guidance given on page 10 of NRC RG- 1.20 (Reference 5). Using the harmonic analysis approach, a consistent damping level is used across the frequency domain.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 4-2 Table 4.1 Quumma. fi Mo Prr-f;.

P-a

.a,b,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-1 5 MODAL ANALYSIS As a precursor to performing the transient analysis, a modal analysis of the dryer was performed. The modal analysis was performed for modes between 0 Hz and 140 Hz. The fundamental modes for the hood and skirt are shown in Figure 5-1 through Figure 5-8. The fundamental modes for the

]c, respectively.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-2 a,c Figure 5-1 Modal Analysis: I I8.c May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-3 a.c Figure 5-2 Modal Analysis: I ]axC WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-4 WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-4 a,c Figure 5-3 Modal Analysis: I Sa.c May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-5 a,c Figure 5-4 Modal Analysis: I I2,C May 2012 WCAP-1 7549-NP WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-6 a,c Figure 5-5 Modal Analysis: a,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-7 a,c I

Figure 5-6 Modal Analysis: [ Ia.c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-8 WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-8 a.c Figure 5-7 Modal Analysis: I la,c May 2012 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-9 WESTINGHOUSE NON-PROPRIETARY CLASS 3 5-9 a,c Figure 5-8 Modal Analysis: I WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-1 6 LOAD APPLICATION The frequency-dependent acoustic loads were developed using a three-dimensional (3-D) acoustic model representation of the dryer assembly. The acoustic pressure (P) loads on the steam dryer structure were calculated by ac.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-2 aIc WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-3 WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-3 a,c Figure 6-1 Helmholtz Acoustic Model May 2012 WCAP- 7549-NP WCAP-I17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-4 WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-4 a,c Figure 6-2 Three-Dimensional Views of the Acoustic Model May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-5 a,c Figure 6-3 ACE and FEM Global Coordinate System Layout, Top View May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 6-6 Figure 6-4 ACE and FEM Global Coordinate System Layout, Section View May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-1 7 STRUCTURAL ANALYSIS 7.1 HARMONIC ANALYSIS 7.1.1 [ IC Harmonic solutions are obtained using the ANSYS FEM for the following sets of conditions.

  • Model Support (Boundary) Conditions The model is supported Operating Conditions 98% of CLTP and 100% of EPU operating conditions are evaluated.

Frequency Shifts

[

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WESTINGHOUSE NON-PROPF IETARY CLASS 3 7-2 WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-2 7.1.2 Overview - Time-History Solution The harmonic analysis begins with the [

]*. As discussed above, separate solutions are obtained for

]3c.

II

]asc II a,c It is inefficient to process the results

]axc II ac II

]a~c May 2012 17549-NP WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-3 7.1.3 Inverse Fourier Transform 7 F e ca 7.1.4 Frequency Scaling (Shifting)

As a result of approximations of the structural interactions used in developing the FEM, small errors can result in the prediction of the component natural frequencies. Varying degrees of mesh discretization can also introduce small errors in the FEM results. To account for these effects, frequency scaling is applied to the applied load-history.

If frequency scaling is applied, WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-4 WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-4 a,x 7.2 POST-PROCESSING 7.2.1 Primary Stress Evaluation Once the time-history has been calculated []a,, an evaluation is performed to calculate the maximum alternating stress intensity. The stress intensities for the I a,c.

For a 2-D stress field, the principal stresses are calculated as follows (the X-Y plane is used as an example. The same algorithms are also applicable to other planes.)

G

-x + (Ty --GIy) 2 - 2 3= 0.0 IG, - 21 Stress Intensity = Maximum a0 2 - (531 l3 -Ol For a general 3-D state of stress, the resulting principal stresses correspond to the roots of the following cubic equation as:

0- -3 a 2 0-2 + ala - ao = 0

where, a2 = aN + Ty + C'z a, = *x0-y + (Nyc'z + 0'zx - c'xy-2 'yz -_'zx 2

a0 = axaya 'z+ 2 'xyc'yzyzx - 'xlayz - ay0-z 2 - azaxy2 7.2.2 Alternating Stress The calculation of the alternating stress intensity, following the ASME Code process, is performed as follows.

I1. Apply the SCFs (geometric or fatigue strength reduction factor (FSRF)), as applicable, to the component stresses.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-5

2. Calculate the range of stress for each component of stress for two time points.

Calculate the stress intensity of the component ranges.

a,¢c 7.3 CALCULATING AND EVALUATING WELD STRESSES Due to the nature of the dynamic analysis, detailed modeling of the welds is not practical in the global dryer FEM. Calculating weld stresses requires a different approach. For the Monticello replacement steam dryer,

]a,c.

7.3.1 Detailed Fillet Weld Calculations As discussed above, detailed weld stresses are not directly available from the finite element analysis.

]a,c.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-6 WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-6

]a.c.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-7 WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-7 7.3.2 Calculating and Evaluating Weld Stresses [ Ia,c For the full penetration welds, [

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-8 WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-8

]ac May 2012 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-9 7.4 1a

]a'c.

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 7-10 ac ax Figure 7-1 WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-1 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-1 8 ANALYSIS RESULTS 8.1 GLOBAL MODEL As discussed previously, [

]ac.

A summary [

axc 8.2 I Saxc 8.2.1 [ IalC

[

lac.

8.3 [ Iac 8.3.1 I Ia,C

[

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WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-2 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-2 aW-WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-3 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-3 Table 8-1 Stress Results for 98% of CLTP Conditions a,b,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-4 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-4 Table 8-1 Stress Results for 98% of CLTP Conditions (cont.) a,b,c WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-5 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-5 Table 8-2 Stress Results for EPU Conditions a,b,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-6 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-6 Table 8-2 Stress Results for EPU Conditions (cont.)

a,b,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-7 Table 8-3 [

]ac for 98% of CLTP a,b,c Table 8-4 f

]acfor EPUJ a,b,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-8 WESTINGHOUSE NON-PROPRIETARY CLASS 3 8-8 a,c Figure 8-1 1 I3,c WCAP- 1 7549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 9-1 9

SUMMARY

OF RESULTS AND CONCLUSIONS

[

]a,c.

WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 9-2 WESTINGHOUSE NON-PROPRIETARY CLASS 3 9-2 Table 9-1 Summary of Results: 98% of CLTP Conditions a,b,c WCAP-17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 9-3 WESTINGHOUSE NON-PROPRIETARY CLASS 3 9-3 Table 9-2 Summary of Results: EPU Conditions

- ab,c WCAP- 17549-NP May 2012 Revision 0

WESTINGHOUSE NON-PROPRIETARY CLASS 3 10-1 10 REFERENCES

1. Westinghouse Electric Sweden AB Report SES09-127, Rev. 2, Monticello Steam Dier Replacement

- Structural Verification of Steam Diy3er, June 2010. (Westinghouse Proprietary)

2. ASME Boiler and Pressure Vessel Code, 2004 Edition,Section III, Division 1.
3. BWRVIP-1 82-A, Guidancefor DemonstrationofSteam Dryer hntegriyfor Power Uprate, Electric Power Research Institute, Palo Alto, CA, May 2010.
4. ASME Boiler and Pressure Vessel Code, 2004 Edition,Section II, Part D.
5. U.S. Nuclear Regulatory Commission, Regulatory Guide 1.20, Rev. 3, Comprehensive Vibration Assessment Program for Reactor InternalsDuring PreoperationalandInitial Startup Testing, March 2007.
6. Westinghouse WCAP- 17251 -P, Rev. 0, "Monticello Replacement Steam Dryer Four-Line Acoustic Subscale Testing Report," June 2010. (Westinghouse Proprietary)
7. Westinghouse WCAP- I7252-P, Rev. 2-A, Acoustic Loads Definitionfor the Monticello Steam Drer Replacement Project, March 2012. (Westinghouse Proprietary)
8. Westinghouse WCAP-17540-P, Rev. 0-A, Monticello Replacement Steam Di-'erProgramAcoustic Load Definition Methodology, March 2012. (Westinghouse Proprietary)
9. [

WCAP- 17549-NP May 2012 Revision 0

L-MT-12-056 ENCLOSURE 13 NON-PROPRIETARY ATTACHMENT FROM WESTINGHOUSE LETTER LTR-A&SA-09-32, REVISION 5 LIMIT CURVES FOR MONTICELLO POWER ASCENSION 3 pages follow

WESTINGHOUSE NON-PROPRIETARY CLASS 3 LTR-A&SA-09-32 NP-Attachment-Revision 5 June 2012

Attachment:

Limit Curves for Monticello Power Ascension Westinghouse Electric Company LLC 1000 Westinghouse Drive Cranberry Township, PA 16066 USA

© 2012 Westinghouse Electric Company LLC All Rights Reserved

Page 6 of 7 Our ref. LTR-A&SA-09-32, Rev. 5 June 6, 2012 a,c Figure 1 Limit Curves, MSL A ax Figure 2 Limit Curves, MSL B

Page 7 of 7 Our ref: LTR-A&SA-09-32, Rev. 5 June 6, 2012 axc Figure 3 Limit Curves, MSL C a'c Figure 4 Limit Curves, MSL D

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