Pilgrim, Salt Service Water Discharge Piping Elbow (JF29-8 ... the appropriate load combination piping resultant moments in a later calculation. The input files for the moment evaluation

ATTACHMENT 3

TO ENTERGY LETTER 2.14.023

PILGRIM RELIEF REQUEST PRR-25

Calculation Cover Page EC # 49514

Pilgrim Salt Service Water Discharge Piping Elbow (JF29-8-4) Wall Thinning StressAnalysis

Structural Integrity Associates Calculation No. 1400287.301, Rev. 0

(22 Pages)

ATTACHMENT 9.2 ENGINEERING CALCULATION COVER PAGE

Sheet 1 of 2

nI ANO-1 LI ANO-2 El GGNS E] IP-2 [I IP-3 El PLP

El JAF E PNPS E] RBS EL VY [I W3

LI NP-GGNS-3 LI NP-RBS-3

CALCULATION ()EC # 49514 J2) Page I of 2.2.

COVER PAGE

(3) Design Basis Calc. [-]YES [•NO (4) [N CALCULATION. El- EC Markup

(5) Calculation No: M1397 Ir) Revision: 0

(7) Title: Pilgrim Salt Service Water Discharge Piping Elbow (O) Editorial(JF29-8-4) Wall Thinning Stress Analysis D- YES NO(9) System(s): 29 (10) Review Org (Department):

(11) Safety Class: (12) Component/Equipment/StructureType/N umber:__________

Ej Safety / Quality Related PIpe/Nu F29 8-PIPE / JF29-8-4

D- Augmented Quality Program

E- Non-Safety Related

(13) Document Type: CALC

(14) Keywords (Description/Topical

Codes):

JF29-8-4, spool, SIA, Structural IntegrityAssociates, flaw, leak, rubber lining,1400287.301, 1400287

REVIEWS

(15) Name/Signature/Date (16) Name/Sigrnature/Date (17) Name/Signature/DateStructural Integrity Assoc. John A. Tucker , 3),IY See IAS

Responsible Engineer L--] Design Verifier Supervisor/ApprovalN Reviewer--El Comments Attached El Comments Attached

EN-DC-126 R005

ATTACHMENT 9.3 CALCULATION REFERENCE SHEET

Sheet 1 of 3

CALCULATION CALCULATION NO: M1397REFERENCE SHEET REVISION: O0

I. EC Markups Incorporated (N/A to NP calculations)1.N/A2.3.4.5.I1. Relationships: Sht Rev Input Output Impact Tracking

Doc Doc Y/N No.1. Specification M300 2-12 109 x 0 N2. M100-7250 - 5 x 0 N3. _0 0_4. []0 05. 0 0 __

II1. CROSS REFERENCES:

1.PNPS Dwg M100-72502.ASME Code Case N-513-33.Flow of Fluids Through valves, Fittings and Pipe, Crane Co,., Technical Paper No.

4104.5.

IV. SOFTWARE USED:

Title: ANSYS Mechanical APDL and PrepPost Version/Release: 12.1x64, Nov2009 Disk/CD No. --

V. DISK/CDS INCLUDED:

Title: N/A Version/Release Disk/CD No.

VI. OTHER CHANGES:

EN-DC-126 R005

V Structural Integrity Associates, Incy® File No.: 1400287.301Project No.: 1400287

CALCULATION PACKAGE Quality Program: Z Nuclear E] Commercial

PROJECT NAME:Pilgrim Leaking Elbow Evaluation Support

CONTRACT NO.:

10404807, Change Order No. 001

CLIENT: PLANT:Entergy Nuclear Pilgrim Nuclear Power Station

CALCULATION TITLE:Pilgrim Salt Service Water Discharge Piping Elbow (JF29-8-4 Spool) Wall Thinning Stress Analysis

Document Affected Project Manager Preparer(s) &Revision Pages Revision Description Approval Checker(s)

Signature &Date Signatures & Date

0A -1-16 Initial IssueA-I - A-2 - 2B-I - B-2

Eric Houston Richard BaxEJH 3/3/14 RLB 3/3/14

Jim WuJW 3/3/14

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Table of Contents

1.0 O BJECTIV E ......................................................................................................... 4

2.0 TECHNICAL APPROACH .................................................................................... 4

3.0 ASSUMPTIONS / DESIGN INPUTS ..................................................................... 4

4.0 900 ELBOW FINITE ELEMENT MODEL DEVELOPMENT ............................. 4

4.1 Geometry and Element Selection ................................................................. 4

4.2 Boundary Conditions ................................................................................... 5

5.0 RESULTS OF ANALYSIS ..................................................................................... 5

6.0 REFERENCES .................................................................................................... 6

APPENDIX A COMPUTER FILES ................................................................................ A-i

APPENDIX B JF29-8-4 SPOOL UT DATA ................................................................... B-1

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List of Tables

Table 1: Membrane Stresses along the Elbow through the Leak Location ........................ 7

List of Figures

Figure 1:

Figure 2:

Figure 3:

Figure 4:

Figure 5:

Figure 6:

Figure 7:

Figure 8:

Figure 9:

Photo of UT Grid .................................................................................................. 8

Leak Location ........................................................................................................ 9

Model Geometry, Global View .......................................................................... 10

Model Geometry, Thinning View ........................................................................... 11

Finite Element Model ......................................................................................... 12

Loads and Boundary Condition Application for Global-Z Moment .................. 13

Total Hoop Stress Results due to In-Plane (Global-Z) Unit Moment ................. 14

Total Hoop Stress Results due to Out-of-Plane (Global-Y) Unit Moment ........ 15

Linearized Path Locations .................................................................................. 16


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1.0 OBJECTIVEA weeping flaw was identified in a 900 elbow at Pilgrim Nuclear Power Station. The leakage wasidentified in the Salt Service Water system, JF29-8-4 Spool [1]. Structural Integrity Associates (SI) wascontracted to demonstrate the suitability for continued operation of the leaking elbow using methodsconsistent with an upcoming revision of Code Case N-513-3 [2]. The objective of this calculation is todevelop a finite element model of the thinned elbow and determine the local stresses due to appliedbending loads.

2.0 TECHNICAL APPROACH

A finite element model (FEM) of the leaking elbow will be developed using the ANSYS finite elementsoftware program [3]. Unit moment loads will then be applied to the model and stresses in the localregion of the leak will be extracted for use in an evaluation of allowable through-wall flaw lengths,which will be documented in a later calculation.

3.0 ASSUMPTIONS / DESIGN INPUTSThe evaluated local thinning is from Reference [4] and is shown in Appendix B. The grid spacing is0.75 inch [4]. The thinning data point locations for the Reference [4] values are shown in Figure 1.

Design input for the 90' elbow is taken from Reference [1] unless noted otherwise.

" Elbow Type: long radius (R) = 1.5.(Nominal Pipe Size) = 27 inches" Outside diameter (OD): 18 inches* Nominal wall thickness (t): Schedule 20 pipe = 0.312 inches [5]" Elbow material: ASTM A-234, Grade WPB.

4.0 900 ELBOW FINITE ELEMENT MODEL DEVELOPMENTA three-dimensional (3-D) FEM of the 900 elbow is developed with the ANSYS finite element analysissoftware package [3].

4.1 Geometry and Element Selection

The three-dimensional finite element model is constructed using ANSYS 8-node SOLID45 structuralsolid elements. The region of ultrasonic (UT) measurement consists of eight (8) axial grid blocks bysixty-one (61) circumferential grid blocks [4]. Reference [4b] indicates that the axial grid is centeredacross the axial position of the leak (see Figure 1). The axial position of the hole, relative to the elbow isprovided in Reference [6] and shown in Figure 2. The remaining elbow region, which was not UTexamined is assumed to have a wall thickness equal to the nominal wall thickness of the pipe,0.312 inch.

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An additional length of straight pipe is added to either end of the elbow in order to remove boundarycondition end effects from the areas of interest. The wall thicknesses of the additional lengths of pipeare modeled using nominal wall thickness, 0.312 inch.

The leak location that is shown in Figure 2 is modeled as a square hole that is approximately 0.674inches long axially by 0.464 inches long circumferentially. The elements originally modeled in the holeregion are deactivated via the ANSYS EKILL command. The deactivated elements have near-zerostiffness contribution to the structure. The hole center axially between the Row 4, Column AO andRow 5 Column AO UT data points [4b] (see Appendix B).

Figure 3 shows a global view of the FEM solid model geometry. Figure 4 shows a view of the thinningin the solid model geometry with a detailed view of the leak region. Figure 5 shows a global view of thefinal finite element model mesh. The ANSYS input files that generate the FEM are listed in Appendix A.

4.2 Boundary Conditions

Two separate moment loads are applied to the FEM; an arbitrary unit 10,000 in-lb moment in the plane(moment about the global-z) of the elbow and an arbitrary unit 10,000 in-lb moment out of the plane(moment about the global-y) of the elbow (torsion loading is not evaluated). For the evaluations, oneend of the attached piping is fixed in the axial and circumferential directions, and the CONTA 175 andTARGE170 ANSYS elements are used in the application of a pilot node to apply the moment loading tothe other free end of the attached piping. An example of the applied boundary conditions is shown inFigure 6.

The resulting peak hoop stresses in the elbow are shown in Figures 7 and 8 for the in-plane and out-of-plane moment loads, respectively. The resulting stresses from these moment evaluations will be scaledto the appropriate load combination piping resultant moments in a later calculation. The input files forthe moment evaluation are listed in Appendix A.

5.0 RESULTS OF ANALYSISLinearized stresses are extracted at each of the grid locations provided in Reference [4] along the axialpath of the elbow and through the leak location as shown in Figure 9. The extracted hoop membranestress due to two moment loads are stored in the Excel spreadsheet, Pilgrim-Results.xlsx, and the resultsare shown in Table 1.

The input files for the post-processing as well as the output files are listed in Appendix A.

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6.0 REFERENCES

1. Entergy Drawing No. Ml100-7250, Rev. E5, "Service Water System, E209N SSW BackwashDrain Piping," SI File No. 1400287.201.

2. ASME Code Case N-513-3, "Evaluation Criteria for Temporary Acceptance of Flaws inModerate Energy Class 2 or 3 Piping Section XI, Division I," Cases of ASME Boiler andPressure Vessel Code, January 26, 2006.

3. ANSYS Mechanical APDL and PrepPost, Release 12.1 x64, ANSYS, Inc., November 2009.

4. Email from John Tucker (Entergy) to Eric Houston (SI), "Subject: FW: JF29-4-8," dated 2/25/14,with attached files, SI File No. 1400287.20 1.

a) JF29-4-8 spool.JPG

b) Spool JF29 4 8 012.xls

5. Flow of Fluids Through Valves, Fittings and Pipe, Crane Co., Technical Paper No. 410, 1976.

6. Email from Roger Metthe (Entergy) to Eric Houston (SI), "Subject: Pilgrim Hole LocationSketch," dated 2/25/14, with attached file, SI File No. 1400287.201.

a) Pilgrim Hole Location Sketch.pdf


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Table 1: Membrane Stresses along the Elbow through the Leak Location

UT Data Thickness Membrane Hoop Stress, psi°Point", Inches (2) In-Plane (Global-Z) Out-of-Plane (Global-Y)Nominal 0.312 16 2

1, AO 0.352 17 252, AO 0.353 25 213, AO 0.361 21 61

4, AO(4) 0.051 352 1655, AO 4

1 0.064 281 526, AO 0.362 21 397, AO 0.343 36 238, AO 0.366 41 42

Nominal 0.312 16 3Notes:

1) See Figure 9 for layout of UT Data Points and Figure 4 for relative location on the elbow.2) UT data per Reference 4b and nominal thickness for 18 inch, Schedule 20 pipe.3) The unit moment loadings where applied in arbitrary directions and thus the stress reported here

are in terms of absolute values.4) The modeled hole is centered between these two data points.


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Figure 1: Photo of UT Grid

(From Reference 4a)


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T4,¢0•

Figure 2: Leak Location

(From Reference 6a)


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MAT NM_

ANFEB 26 2014

15:26:57PLOT NO. 1

• ~Region of UT DataI

Figure 3: Model Geometry, Global View


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ANFEB 26 2014

15:36:55PLOT NO. 1

-11.25inches

Figure 4: Model Geometry, Thinning View


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ELE=S

PEAL NUM

ANFEB 26 2014

16:26:36PLIOT NO. 1

Figure 5: Finite Element Model


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ELENENSPFL NUM

ANFEB 26 2014

16:28:04PLOT NO. 1

Pilot --

Node

Circumferentialand Axial DOF

Constraints

Figure 6: Loads and Boundary Condition Application for Global-Z Moment


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NWDAL SOLUTICN

STEP=-2SUB =1TIME=2SZ (AVG)RSYS=12DMX =.009007SWN =-1169SMX =891.661

ANFEB 27 2014

16:33:51PILT NO. 1

-----• Modeled Hole

-1169 -711.041 -253.126 204..789 662.704-939.998 -482.083 -24.168 433.746 891.661

Figure 7: Total Hoop Stress Results due to In-Plane (Global-Z) Unit Moment

(Units are in terms of psi)


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NODAL SOLUTICN

STEP=-ISUB =1TIM1=1Sz (AVG)RSYS=12DMX =. 00522SHN =-642.857SMX =658.506

ANFEB 27 2014

16:34:16PLOT NO. 1

---- '•Modeled Hole

-642.857 -353.665-4q,.2?61 -?2fl_ fq

-64.474 Rfl 122 224.718 513.91ýF~q_.314

Figure 8: Total Hoop Stress Results due to Out-of-Plane (Global-Y) Unit Moment

(Units are in terms of psi)


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LhINES

REAL NUMNominal: 0.312"

Hole Region

I Nominal: 0.3 12"

FEB 26 201416:44:08

PLOT NO. 1Location (8, AO): 0.366" 1

Location (7, AO): 0.343" 1

Location (6, AO): 0.362" 1

Location (5, AO): 0.064"I

Location (4, AO): 0.05 1" I1" |

I Location (3, AO): 0.361" 1

Location (2, AO): 0.353"

Location (1, AO): 0.3525

Figure 9: Linearized Path Locations


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APPENDIX A

COMPUTER FILES


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FILENAME DESCRIPTIONgeom-pil.inp ANSYS input file to generate finite element model.pilgrim.prn ASCI file called by geom-pil.inp containing UT data. Generated in

Excel spreadsheet Thickness Data.xls.load-pil-M.inp ANSYS input file to run two 10,000 in-lb moment evaluations.post-piI-M.inp ANSYS input file to extract linearized stress results for two

p10,000 in-lb moment evaluations.

Pilgrim-Unit-In.out Output file containing linearized stress results for 10,000 in-lbin-plane moment (about Global-Z) evaluation.

Pilgrim-Unit-Out.out Output file containing linearized stress results for 10,000 in-lbout-of-plane moment (about Global-Y) evaluation.

Thickness Data.xls Excel file with final UT data.Pilgrim-Resuits.xlsx Compilation of the linearized stress results.


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APPENDIX B

JF29-8-4 SPOOL UT DATA


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Pilgrim, Salt Service Water Discharge Piping Elbow (JF29-8 ... the appropriate load combination piping resultant moments in a later calculation. The input files for the moment evaluation