ML14073A060

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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
Structural Integrity Associates
To:
Office of Nuclear Reactor Regulation
References
1400287.301, Rev. 0
Download: ML14073A060 (23)
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Text

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 Stress Analysis 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/Structure Type/N umber:__________

8-PIpe/Nu F29 Ej Safety / Quality Related 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 Integrity Associates, flaw, leak, rubber lining, 1400287.301, 1400287 REVIEWS (15) Name/Signature/Date (16) Name/Sigrnature/Date (17) Name/Signature/Date Structural Integrity Assoc. John A. Tucker , 3),IY See IAS Responsible Engineer L--] Design Verifier Supervisor/Approval N Reviewer El-- Comments Attached El Comments Attached EN-DC-126 R005

ATTACHMENT 9.3 CALCULATION REFERENCE SHEET Sheet 1 of 3 CALCULATION CALCULATION NO: M1397 REFERENCE SHEET REVISION: O0 I. EC Markups Incorporated (N/A to NP calculations) 1.N/A 2.

3.

4.

5.

I1. Relationships: Sht Rev Input Output Impact Tracking Doc Doc Y/N No.

1. Specification M300 2-12 109 x 0 N
2. M100-7250 - 5 x 0 N
3. _0 0_
4. []0 0
5. 0 0 __

II1. CROSS

REFERENCES:

1.PNPS Dwg M100-7250 2.ASME Code Case N-513-3 3.Flow of Fluids Through valves, Fittings and Pipe, Crane Co,., Technical Paper No.

410 4.

5.

IV. SOFTWARE USED:

Title:

ANSYS Mechanical APDL and PrepPost Version/Release: 12.1x64, Nov 2009 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.: 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 Issue A-I - A-2 - 2 B-I - B-2 Eric Houston Richard Bax EJH 3/3/14 RLB 3/3/14 Jim Wu JW 3/3/14 Page 1 of 16 F0306-OI RI

rStructuralIntegrity Associates, Inc!

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 File No.: 1400287.301 Page 2 of 16 Revision: 0 F0306-01 RI

CStructuralIntegrity Associates, Inc.0 List of Tables Table 1: Membrane Stresses along the Elbow through the Leak Location ........................ 7 List of Figures Figure 1: Photo of UT Grid .................................................................................................. 8 Figure 2: Leak Location ........................................................................................................ 9 Figure 3: Model Geometry, Global View .......................................................................... 10 Figure 4: Model Geometry, Thinning View ........................................................................... 11 Figure 5: Finite Element Model ......................................................................................... 12 Figure 6: Loads and Boundary Condition Application for Global-Z Moment .................. 13 Figure 7: Total Hoop Stress Results due to In-Plane (Global-Z) Unit Moment ................. 14 Figure 8: Total Hoop Stress Results due to Out-of-Plane (Global-Y) Unit Moment ........ 15 Figure 9: Linearized Path Locations .................................................................................. 16 File No.: 1400287.301 Page 3 of 16 Revision: 0 F0306-OIRI

1f'StructuralIntegrity Associates, Inc!

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

2.0 TECHNICAL APPROACH A finite element model (FEM) of the leaking elbow will be developed using the ANSYS finite element software program [3]. Unit moment loads will then be applied to the model and stresses in the local region 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 INPUTS The evaluated local thinning is from Reference [4] and is shown in Appendix B. The grid spacing is 0.75 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 analysis software 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 by sixty-one (61) circumferential grid blocks [4]. Reference [4b] indicates that the axial grid is centered across the axial position of the leak (see Figure 1). The axial position of the hole, relative to the elbow is provided in Reference [6] and shown in Figure 2. The remaining elbow region, which was not UT examined 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 16 Revision: 0 F0306-0I R1

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An additional length of straight pipe is added to either end of the elbow in order to remove boundary condition end effects from the areas of interest. The wall thicknesses of the additional lengths of pipe are 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 0.674 inches long axially by 0.464 inches long circumferentially. The elements originally modeled in the hole region 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 and Row 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 thinning in the solid model geometry with a detailed view of the leak region. Figure 5 shows a global view of the final 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, one end of the attached piping is fixed in the axial and circumferential directions, and the CONTA 175 and TARGE170 ANSYS elements are used in the application of a pilot node to apply the moment loading to the other free end of the attached piping. An example of the applied boundary conditions is shown in Figure 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 scaled to the appropriate load combination piping resultant moments in a later calculation. The input files for the moment evaluation are listed in Appendix A.

5.0 RESULTS OF ANALYSIS Linearized stresses are extracted at each of the grid locations provided in Reference [4] along the axial path of the elbow and through the leak location as shown in Figure 9. The extracted hoop membrane stress due to two moment loads are stored in the Excel spreadsheet, Pilgrim-Results.xlsx, and the results are 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 16 Revision: 0 F0306-01 RI

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6.0 REFERENCES

1. Entergy Drawing No. Ml100-7250, Rev. E5, "Service Water System, E209N SSW Backwash Drain Piping," SI File No. 1400287.201.
2. ASME Code Case N-513-3, "Evaluation Criteria for Temporary Acceptance of Flaws in Moderate Energy Class 2 or 3 Piping Section XI, Division I," Cases of ASME Boiler and Pressure 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 Location Sketch," dated 2/25/14, with attached file, SI File No. 1400287.201.

a) Pilgrim Hole Location Sketch.pdf File No.: 1400287.301 Page 6 of 16 Revision: 0 F0306-01 RI

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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 25 2, AO 0.353 25 21 3, AO 0.361 21 61 4, AO(4) 0.051 352 165 5, AO 41 0.064 281 52 6, AO 0.362 21 39 7, AO 0.343 36 23 8, AO 0.366 41 42 Nominal 0.312 16 3 Notes:

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)

File No.: 1400287.301 Page 9 of 16 Revision: 0 F0306-O1RI

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AN FEB 26 2014 MAT NM_ 15:26:57 PLOT NO. 1

  • ~Region of UT DataI Figure 3: Model Geometry, Global View File No.: 1400287.301 Page 10 of 16 Revision: 0 F0306-OIRI

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AN FEB 26 2014 15:36:55 PLOT NO. 1

-11.25inches Figure 4: Model Geometry, Thinning View File No.: 1400287.301 Page IIof 16 Revision: 0 F0306-OIRI

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AN ELE=S FEB 26 2014 PEAL NUM 16:26:36 PLIOT NO. 1 Figure 5: Finite Element Model File No.: 1400287.301 Page 12 of 16 Revision: 0 F0306-01 RI

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AN ELENENS FEB 26 2014 PFL NUM 16:28:04 PLOT NO. 1 Pilot --

Node Circumferential and Axial DOF Constraints Figure 6: Loads and Boundary Condition Application for Global-Z Moment File No.: 1400287.301 Page 13 of 16 Revision: 0 F0306-Oi R1

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AN NWDAL SOLUTICN FEB 27 2014 STEP=-2 16:33:51 SUB =1 PILT NO. 1 TIME=2 SZ (AVG)

RSYS=12 DMX =.009007 SWN =-1169 SMX =891.661

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)

File No.: 1400287.301 Page 14 of 16 Revision: 0 F0306-01 R1

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AN NODAL SOLUTICN FEB 27 2014 STEP=-I 16:34:16 SUB =1 PLOT NO. 1 TIM1=1 Sz (AVG)

RSYS=12 DMX =. 00522 SHN =-642.857 SMX =658.506

'*Modeled Hole

-642.857 -353.665 -64.474 Rfl 122 224.718 513.91

-4q,.2?61 -?2fl_ fq ýF~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 Page 15 of 16 Revision: 0 F0306-01 R1

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LhINES Nominal: 0.312" FEB 26 2014 REAL NUM 16:44:08 PLOT NO. 1 Location (8, AO): 0.366" 1 Location (7, AO): 0.343" 1 Location (6, AO): 0.362" 1 Location (5, AO): 0.064" I

Hole Region Location (4, AO): 0.05 1" I 1" l I Location (3, AO): 0.361" 1 Location (2, AO): 0.353" Location (1, AO): 0.3525 I Nominal: 0.3 12" Figure 9: Linearized Path Locations File No.: 1400287.301 Page 16 of 16 Revision: 0 F0306-01R I

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APPENDIX A COMPUTER FILES File No.: 1400287.301 Page A- I of A-2 Revision: 0 F0306-01 R1

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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 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-lb in-plane moment (about Global-Z) evaluation.

Pilgrim-Unit-Out.out Output file containing linearized stress results for 10,000 in-lb out-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 Page A-2 of A-2 Revision: 0 F0306-OIRI

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APPENDIX B JF29-8-4 SPOOL UT DATA File No.: 1400287.301 Page B-1 of B-2 Revision: 0 F0306-OIRI

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