ML14073A060

Pilgrim, Salt Service Water Discharge Piping Elbow (JF29-8-4) Wall Thinning Stress Analysis, Calculation No. 1400287.301, Rev. 0

ML14073A060
Person / Time
Site:	Pilgrim
Issue date:	03/03/2014
From:	Tucker J A Structural Integrity Associates
To:	Office of Nuclear Reactor Regulation
References
1400287.301, Rev. 0
Download: ML14073A060 (23)

Text

ATTACHMENT 3TO ENTERGY LETTER 2.14.023PILGRIM RELIEF REQUEST PRR-25Calculation Cover Page EC # 49514Pilgrim Salt Service Water Discharge Piping Elbow (JF29-8-4)

Wall Thinning StressAnalysisStructural Integrity Associates Calculation No. 1400287.301, Rev. 0(22 Pages)

ATTACHMENT 9.2 ENGINEERING CALCULATION COVER PAGESheet 1 of 2nI ANO-1 LI ANO-2 El GGNS E] IP-2 [I IP-3 El PLPEl JAF E PNPS E] RBS EL VY [I W3LI NP-GGNS-3 LI NP-RBS-3CALCULATION

()EC # 49514 J2) Page I of 2.2.COVER PAGE(3) Design Basis Calc. [-]YES (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/Structure Type/N umber:__________

Ej Safety / Quality Related PIpe/Nu F29 8-PIPE / JF29-8-4D- Augmented Quality ProgramE- Non-Safety Related(13) Document Type: CALC(14) Keywords (Description/Topical Codes):JF29-8-4, spool, SIA, Structural Integrity Associates, flaw, leak, rubber lining,1400287.301, 1400287REVIEWS(15) Name/Signature/Date (16) Name/Sigrnature/Date (17) Name/Signature/Date Structural Integrity Assoc. John A. Tucker , 3),IY See IASResponsible Engineer L--] Design Verifier Supervisor/Approval N Reviewer--El Comments Attached El Comments AttachedEN-DC-126 R005 ATTACHMENT 9.3CALCULATION REFERENCE SHEETSheet 1 of 3CALCULATION CALCULATION NO: M1397REFERENCE SHEET REVISION:

O0I. EC Markups Incorporated (N/A to NP calculations) 1.N/A2.3.4.5.I1. Relationships:

Sht Rev Input Output Impact TrackingDoc 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 M100-7250 2.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.: 1400287.301 Project No.: 1400287CALCULATION PACKAGE Quality Program:

Z Nuclear E] Commercial PROJECT NAME:Pilgrim Leaking Elbow Evaluation SupportCONTRACT NO.:10404807, Change Order No. 001CLIENT: PLANT:Entergy Nuclear Pilgrim Nuclear Power StationCALCULATION TITLE:Pilgrim Salt Service Water Discharge Piping Elbow (JF29-8-4 Spool) Wall Thinning Stress AnalysisDocument Affected Project Manager Preparer(s)

&Revision Pages Revision Description Approval Checker(s)

Signature

&Date Signatures

& Date0A 16 Initial IssueA-I -A-2 -2B-I -B-2Eric Houston Richard BaxEJH 3/3/14 RLB 3/3/14Jim WuJW 3/3/14Page 1 of 16F0306-OI RI rStructural Integrity Associates, Inc!Table of Contents1.0 O BJECTIV E .........................................................................................................

42.0 TECHNICAL APPROACH

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

43.0 ASSUMPTIONS

/ DESIGN INPUTS .....................................................................

44.0 900 ELBOW FINITE ELEMENT MODEL DEVELOPMENT

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

44.1 Geometry and Element Selection

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

44.2 Boundary Conditions

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

55.0 RESULTS OF ANALYSIS

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

56.0 REFERENCES

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

6APPENDIX A COMPUTER FILES ................................................................................

A-iAPPENDIX B JF29-8-4 SPOOL UT DATA ...................................................................

B-1File No.: 1400287.301 Revision:

0Page 2 of 16F0306-01 RI CStructural Integrity Associates, Inc.0List of TablesTable 1: Membrane Stresses along the Elbow through the Leak Location

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

7List of FiguresFigure 1:Figure 2:Figure 3:Figure 4:Figure 5:Figure 6:Figure 7:Figure 8:Figure 9:Photo of UT Grid ..................................................................................................

8Leak Location

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

9Model Geometry, Global View ..........................................................................

10Model Geometry, Thinning View ...........................................................................

11Finite Element Model .........................................................................................

12Loads and Boundary Condition Application for Global-Z Moment ..................

13Total Hoop Stress Results due to In-Plane (Global-Z)

Unit Moment .................

14Total Hoop Stress Results due to Out-of-Plane (Global-Y)

Unit Moment ........

15Linearized Path Locations

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

16File No.: 1400287.301 Revision:

0Page 3 of 16F0306-OIRI 1f'Structural Integrity Associates, Inc!1.0 OBJECTIVE A 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 APPROACHA 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 DEVELOPMENT A 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 structural solid 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.File No.: 1400287.301 Page 4 of 16Revision:

0F0306-0I R1 VStructural Integrity Associates, Inc.!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-zero stiffness 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.File No.: 1400287.301 Page 5 of 16Revision:

0F0306-01 RI

ýkSlructural Integrity Associates, Inc.

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.xls5. 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 File No.: 1400287.301 Revision:

0Page 6 of 16F0306-01 RI V Structural Integrity Associates, Inc!Table 1: Membrane Stresses along the Elbow through the Leak LocationUT Data Thickness Membrane Hoop Stress, psi°Point", Inches (2) In-Plane (Global-Z)

Out-of-Plane (Global-Y)

Nominal 0.312 16 21, AO 0.352 17 252, AO 0.353 25 213, AO 0.361 21 614, AO(4) 0.051 352 1655, AO41 0.064 281 526, AO 0.362 21 397, AO 0.343 36 238, AO 0.366 41 42Nominal 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 hereare in terms of absolute values.4) The modeled hole is centered between these two data points.File No.: 1400287.301 Revision:

0Page 7 of 16F0306-01 R1 CStructural Integrity Associates, Inc!Figure 1: Photo of UT Grid(From Reference 4a)File No.: 1400287.301 Revision:

0Page 8 of 16F0306-01 RI V Structural Integrity Associates, Inc!T4,¢Figure 2: Leak Location(From Reference 6a)File No.: 1400287.301 Revision:

0Page 9 of 16F0306-O1RI CStructural Integrity Associates, Inc.MAT NM_ANFEB 26 201415:26:57PLOT NO. 1~Region of UT DataIFigure 3: Model Geometry, Global ViewFile No.: 1400287.301 Revision:

0Page 10 of 16F0306-OIRI VStructural Integrity Associates, Inc.!ANFEB 26 201415:36:55PLOT NO. 1-11.25inches Figure 4: Model Geometry, Thinning ViewFile No.: 1400287.301 Revision:

0Page II of 16F0306-OIRI W Structural Integrity Associates, Inc.!ELE=SPEAL NUMANFEB 26 201416:26:36PLIOT NO. 1Figure 5: Finite Element ModelFile No.: 1400287.301 Revision:

0Page 12 of 16F0306-01 RI V Structural Integrity Associates, Inc.ELENENSPFL NUMANFEB 26 201416:28:04PLOT NO. 1Pilot --NodeCircumferential and Axial DOFConstraints Figure 6: Loads and Boundary Condition Application for Global-Z MomentFile No.: 1400287.301 Revision:

0Page 13 of 16F0306-Oi R1 Structural Integrity Associates, Inc.NWDAL SOLUTICNSTEP=-2SUB =1TIME=2SZ (AVG)RSYS=12DMX =.009007SWN =-1169SMX =891.661ANFEB 27 201416:33:51PILT NO. 1-----Modeled Hole-1169 -711.041

-253.126 204..789 662.704-939.998

-482.083

-24.168 433.746 891.661Figure 7: Total Hoop Stress Results due to In-Plane (Global-Z)

Unit Moment(Units are in terms of psi)File No.: 1400287.301 Revision:

0Page 14 of 16F0306-01 R1 rStructural Integrity Associates, Inc!NODAL SOLUTICNSTEP=-ISUB =1TIM1=1Sz (AVG)RSYS=12DMX =. 00522SHN =-642.857 SMX =658.506ANFEB 27 201416:34:16PLOT NO. 1----

Hole-642.857

-353.665-4q,.2?61

-?2fl_ fq-64.474Rfl 122224.718 513.91ýF~q_.314 Figure 8: Total Hoop Stress Results due to Out-of-Plane (Global-Y)

Unit Moment(Units are in terms of psi)File No.: 1400287.301 Revision:

0Page 15 of 16F0306-01 R1 4 Structural Integrity Associates, Inc.LhINESREAL NUMNominal:

0.312"Hole RegionI Nominal:

0.3 12"FEB 26 201416:44:08PLOT NO. 1Location (8, AO): 0.366" 1Location (7, AO): 0.343" 1Location (6, AO): 0.362" 1Location (5, AO): 0.064"ILocation (4, AO): 0.05 1"I1" lI Location (3, AO): 0.361" 1Location (2, AO): 0.353"Location (1, AO): 0.3525Figure 9: Linearized Path Locations File No.: 1400287.301 Revision:

0Page 16 of 16F0306-01R I

r Structural Integrity Associates, Inc!APPENDIX ACOMPUTER FILESFile No.: 1400287.301 Revision:

0Page A- I of A-2F0306-01 R1 rStructural Integrity Associates, Inc!FILENAME DESCRIPTION geom-pil.inp ANSYS input file to generate finite element model.pilgrim.prn ASCI file called by geom-pil.inp containing UT data. Generated inExcel 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 twop10,000 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.File No.: 1400287.301 Revision:

0Page A-2 of A-2F0306-OIRI V Slructural Integrity Associates, Inc!APPENDIX BJF29-8-4 SPOOL UT DATAFile No.: 1400287.301 Revision:

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