ML13329A425

Enclosure 2 to NL-13-147: IP-CALC-13-00070, Rev. 1, Leak Repair Clamp Evaluation for Line 1093 in 32 Main Transformer Moat.

ML13329A425
Person / Time
Site:	Indian Point
Issue date:	10/30/2013
From:	Lo K Entergy Nuclear Operations
To:	Office of Nuclear Reactor Regulation
Shared Package
ML13329A422	List: ML13329A424 ML13329A425 ML13329A426 NL-13-147, Relief Request 3-008 from ASME Section XI, Subsection IWA-4422.1 to Allow Temporary Non-Code Repair to Service Water Piping
References
NL-13-147 IP-CALC-13-00070, Rev 1
Download: ML13329A425 (15)

Text

ENCLOSURE 2 TO NL-13-147 IP-CALC-13-00070, RI LEAK REPAIR CLAMP EVALUATION FOR LINE 1093 IN 32 MAIN TRANSFORMER MOAT ENTERGY NUCLEAR OPERATIONS, INC.

INDIAN POINT NUCLEAR GENERATING UNIT NO. 3 DOCKET NO. 50-286

1.0 ENGINEERING CALCULATION COVER PAGE Sheet I of 2 El AND-1 E] ANO-2 El GGNS 0l IP-2 El IP-3 El PLP CQ JAF F1 PNPS ] RBS [] VY [1 W3 El NP-GGNS-3 El NP-RBS-3 CALCULATION (') EC # 47124 (2)Page I of 5 COVER PAGE (3) Design Basis Calc. [l YES Z NO (4) Z CALCULATION E" EC Markup (5) Calculation No: IP-CALC-13-00070 .(6"Revision: I (7)

Title:

Leak Repair Clamp Evaluation for Line 1093 in 32 Main Transformer _01 Editorial Moat [I YES ONO

(' System(s): SW Review Org (Department): Civil/Structural (11) Safety Class: (12) Component/Equipment/Structure Type/Number:___________

32 /man ra

[ Safety I Quality Related 32 Main Transformer El Augmented Quality Program Moat E- Non-Safety Related 113) Document Type: CALC (14) Keywords (Description/Topical Codes):

_'_ REVIEWS

(,s) Name/Signature/Daten (16) Name/Si nature/Date (7) Name/ nnr tr/Mt Kai Lo 10-30-2013/ G. BhalIa. R. Drake Responsible Engineer [ Design Verifier l Supesor/Alproval 3

] Reviewer

__ Comments Attached [i Comments Attached EN-DC-126 REV 4

2.0 CALCULATION REFERENCE SHEET Page 2 of 5 CALCULATION CALCULATION NO: IP-CALC-13-00070 REFERENCE SHEET REVISION: 1 I. EC Markups Incorporated (N/A to NP calculations)

None I1. Relationships: Sht Rev Input Output Impact Tracking Doc Doc Y/N No.

1. 0 0.

2. 0 0 III. CROSS

REFERENCES:

1. IP3 Piping Specification, TS-MS-027

2. USAS B31.1, Power Piping Code, 1967 edition

3. Drawing 9321-22363 (Piping)

4. IP3-UT-13-058

5. ANVIL Catalog

6. CR-IP3-2013-04174

7. CR-IP3-2013-04416

8. IP3-VT-13-021 IV. SOFTWARE USED:

Title:

Version/Release: Disk/CD No.

V. DISK/CDS INCLUDED:

Title:

Version/Release Disk/CD No.

VI. OTHER CHANGES: None EN-DC-126 REV 4

3.0 Rmono OF REVIS(ON Page 3of 5 lRelwsion, Rodf Oi. bi: Revis'ion' Initial issue.

0 Revised calculation due new flaw length EN-DC-126 REV 4

4.0 TABLE OF CONTENTS PAGE 4 OF 5 Pacie No.

1 Calculation Cover Page .................................................................. 1 2 Calculation Reference Sheet .................................................................. 2 3 Record of Revisions 3 4 Table of Contents 4 5 Purpose .................................................................. 5 6 Conclusion ....................................... ...................... 5 7 Input and Design Criteria .................................................................. 5 8 Assumptions ................................................................... 5 9 Method of Analysis .................................................................. 5 10 Calculation ................................................................... 5 Attachment 1:Calculation (2 pages)

Attachment II: Miscellaneous reference material used for calculation (6 page)

Total number of pages: 15 EN-DC-126 REV 4

Page 5 of 5 5.0 Purpose In the moat of the 32 transformer yard, an area was identified of missing metal of the pipe wall thickness due to external surface corrosion. The degraded pipe location is in the ISI Class 3 code boundary (See CR-IP3-2013-04174). CC-N-513-3 was invoked and the degraded piping is structurally adequate. A red rubber patch will be placed on the defective pipe surface held tight to prevent any potential water leakage by means of a pipe damp.

The following pipe stress evaluation is needed due to the addition of the pipe damp and the large flaw size:

1. The additional weight of the clamp on the pipe stress.

2. The clamping pressure acting on the pipe.

3. Ensure the compressive clamping pressure is greater than the pipe's design pressure to prevent water from leaking out.

6.0 Conclusion The additional weight of the pipe damp onto the piping will result in insignificant increase of pipe stress. Based on the VT report, a 12"x6" red rubber pad, 1/4" for the thickness of the rubber pad, and 1116" maximum compressive deformation of the rubber pad, the compressive pipe membrane stress will be below the allowable stress limit. The compressive pressure is greater than the pipe's design pressure and water cannot leak out.

7.0 Input and Design Criteria

1. Piping material: A53 Gr B, schedule 40 per specification TS-MS-027

2. Allowable pipe stress and piping code: St = 15 ksi, B31.1 Power Piping Code, 1967 edition

3. An average Durometer hardness of 70 for red rubber material.

4. 8" wide pipe clamp from Figure 432 of ANVIL catalog.

8.0 Assumptions

1. Actual weight of the pipe clamp is less than 18 Ibs, but 25 lbs is used conservatively.

2. Fig. 432 pipe guide is used as a clamp.

3. A 12" x 6" red rubber pad is a placed at the defective externally corroded area.

4. The thickness of the red rubber is 1/4".

5. 1/16" compression of the red rubber pad is allowed to limit the compressive stress on the pipe.

9.0 Method of analysis The stress of the pipe induced by the damping force is evaluated using case 17 from table 30 of Roark's "Formulas of Stress and Strain".

10.0 Calculation See Attachment I EN-DC-126 REV 4

Attachment I Calculation EN-DC- 126 REV 4

IP-CALC-13-00070 Rev. 0 Page / Of2 Determine the additional bending stress induced by the additional pipe clamp W = weight of clamp = 25 lb (cons) p = design pressure= i.150 psi d = outside diameter  ::10.75 in t= nominal wall thickness = 0.365, in S section modulus = 29.9 :1in3 L=pipespan= 8 ::::ft= 96 in Sh = allowable stress 15000.. psi Conservatively consider the pipe is pinned at support ends Ma = moment due to OW = WLJ4 = 600 in-lb fb = bending stress = MaJS = 20 psi fb/Sh = ratio of additional stress to the allow limit = 0.13% negligible Determine the compressive stress induced by the clamping force SA= Durometer Shore A hardness of red rubber -. 70 0 0235 log E = . SA - 06403 = 1.0047 E = modulus of elasticity = 10.11 MPA = 1466 psi w = width of ruber pad axially = 6.0 in I bearing length circumferentially = 12.0 in V = thickness of red rubber pad = ,0.25:ý,.. in 5 deformation due to compression = 0.0625 in defective surface area externally corroded = 2.5"(8.25") = 19.0 in2 A' =

A = area of pad being compressed = wl - A' = 53.00 in2 P compressive force acting on the rubber pad = 8AE/t' = 19427 lb Using the case 17 from Table 30 of Roark's "Formulas of Stresses and Strain" v = poisson ratio 0.3 E = modulus of elasticity = 2.79E+07 psi R = mean pipe radius = 0.5(d - t) = 5.1925 in

= (3(1-v )/(R t2]O = 0.934 in" D = Et3 /112(1-v)]= 124240 in-lb The external uniform compressive pressure will be offset by the 150 psi internal pressure q = external uniform pressure = P/A - p = 217 psi a = w/2 3.0 in Xa= 2801 At x = 0, Max M = (q/2X*)e(X""sin(Xa) 2.52 2

ar'1 mmeridional bending stress = -6M/t = -113 psi < Sh = 15000 psi, o.k.

2'z = circumferential bending stress = va'= -34 psi At x = 0, Max y = (-q/4DK4 )[1 - e(Ka)cos(Xa) = -0.0006 in C02= circumferential membrane stress = yE/R + va 1 = -3291 psi < Sh = 15000 psi Since external clamping pressure is compressive, greater than the pipe's design pressure, water will not leak out.

The minimum wall thickness required for the pipe's hoop stress is 0.054" per IP3-CALC-13-00062.

The thickness of the pipe clamp is 3/16", more than adequate to hold the pipe pressure.

Attachment II Miscellaneous Reference Information EN-DC-126 REV 4

____ Visual Exam of Equipment and Components (VT-3)

- Entergy SitelUnit; IP3 1 3 Procedure: CEP-NDE-0903 Outage No.: N/A Summary No.: SW Line 1093 Procedure Rev.: 5 Report No.: lP3-VT-13-021 Workscope: BOP Work Order No.: 00350692-31 Page: 1 of I Code: ANSI B31.1, 67 - 69 ED Cat./Ittem: NIA Location: Unit #3 Moat Excavation.

Drawing No.: 9321-F-22363

Description:

Visually Examine 10" Line #1093 After Removal of Support.

System ID: Service Water Component ID: 10" SW Line 41093 Limitations: Limited Room on the Bottom Side of the Pipe.

Resolution: 0.105" Character Card Surface Condition: In Service Light Meter Mfg.: NIA Serial No.: NIA Illumination: SAT Light Verification Times: Cal In E NIA I NIA NIA Cal Out [3 N/A Visual EquipmenrlAids: Flashlight, Mirror, Camera, Tape Measure Lo Location: Top of Pipe Wo Location: Centerline of the eroded area Visual Examination: Direct Comments:

Further Examination of Line No, 1093 revealed that the corroded area originally found extended underneath the pipe to the area that was resting on the wood support. Area measures 8-1/4" circumferentlally and 2" wide in the axial direction.

Results: Accept Reject [ Info )ý Ref CR-)P3,2013-04416 and IP3-UT-13-058 Percent Of Coverage Obtained > 90%: NIA Reviewed Previous Data: Yes Examiner Level II Date Reviewer Signature Date Peterson, Joseph F. 1012912013 -m,,'tIV/,I Exmlr Leve Sgatr Date S ~ew A a rDate Other Level Signature Date ANII Review . '..nature tA ____A

go Supplemental Report Report No.: IP3-UT-13-058

, Entergy Page: 7 of 7 Summary No.: 10" Line # 1093 X)

Examiner. Allen, Robert E. 0 L. Level: fi EO Reviewer Date:

Examiner: NIA Level: NIA Site Review:

ANII Revlei $/,* - Date:

Other: WA Level: NIA Comments: Area 3 UTT and pit gage readings.

Sketch or Photo: \\Client\Y$MtddeaI Ver 81JddealServerUDDEAL_lP3\Graphics-Pictures\Service Water10 In Line 1093 Area 3.TIF t'4 eel-A j,-z,:50qPX7-I 'Z-womL Vr- 4ý A&6 *UA0(h-VA CP fIq - - A- I AS PACM14 '.

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Visual Exam of Equipment and Components (VT-3)

-Enterloy Site/Unit: IP3 / 3 Procedure: CEP-NDE-0903 Outage No.: N/A Summary No.: SW Line 1093 Procedure Rev.: 5 Report No.: IP3-VT-13-021 Workscope: BOP Work Order No.: 00350692-31 Page: 1 of 1 Code: ANSI B3i.1, 67 - 69 ED Cat./Item: NIA Location: Unit #3 Moat Excavation.

Drawing No.: 9321-F-22363

Description:

Visually Examine 10" Line #1093 After Removal of Support.

System ID: Service Water Component ID: 10" SW Line #1093 Limitations: Limited Room on the Bottom Side of the Pipe.

Resolution: 0.105" Character Card Surface Condition: In Service Light Meter Mfg.: N/A Serial No.: N/A Illumination: SAT Light Verification Times: Cal In [] N/A I N/A / NIA Cal Out U N/A Visual Equipment/Aids: Flashlight, Mirror, Camera, Tape Measure Lo Location: Top of Pipe Wo Location: Centerline of the eroded area Visual Examination: Direct Loc Loc Loc Ind. Size Remarks L W U/D R/L D/L 8.5" 0" N/A Linear 8.25" x 2" See comments below, the remainder of the exposed pipe

_was in good condition with no corrosion 1- +

• I 1- *1~ I I

-r i- t t

+ + + I I Comments:

Further Examination of Line No. 1093 revealed that the corroded area originally found extended underneath the pipe to the area that was resting on the wood support. Area measures 8-1/4" circumferentially and 2" wide in the axial direction.

Results: Accept I Reject [ Info i.-] Ref CR-1P3-2013-04416 and IP3-UT-13-058 Percent Of Coverage Obtained > 90%: N/A Reviewed Previous Data: Yes Examiner Level 1 S Date Reviewer Signature Date Peterson, Joseph F. 10/29/2013 ,d, Examiner Level Signature Date eviewDate Other Level Signature Date ANII Review

IZ-, 11I Fig. 432 Size Range: 2 through 24" Material Carbon steel FinisAr Plain or Galvanized Special Clamp I

Maximum Temperature. Plain 750V F, Galvanized 450 F for carbon steel pipe only Service: Usedowith and where pipe slides cannot be welded directly to pipe or copper tube. When used with fiberglass, plastic, or aluminum pipe, a thin protective liner should be inserted between the pipe and the clamp. Clamp is designed for use with Figure 257 and Figures 436 and 439 slides and tees.

Ordering. Specify figure number, pipe size, name and finish.

tý Fig. 257 Fig. 439 w/Fig 432 Clamp w/Rg 3 lap w/Fig 432 Clamp "4

_FIG. 432: WEIGHT (LBS)

• DIMENSIONS (IN)

Pipe Size L M N P Q T Weight 2 5 4 2 2h 5'h 4h 3 3 6 5 3 Th61 5h A4 / 4 4 7 6 4 5 8 7 .... .. 5 6 95A 8% 12 8 11% 101A 15 10 13A 12% 6 18 12 15YA 143 21 14 17'A 16'h 1h 41 16 19' 18'h 46 18 12 21'A/ 201h 8 1/ 52 20 23A 22'A 57 24 _ _. 281A ... 261h ..... _ _ 67 41APJAL:U

What is Rubber Hardness?

The hardness of rubber compounds Is measured by the Shore A durometer, the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.

Softer compounds stretch easier and seal Durometr Chart better on rough surfaces. Harder compounds offer greater abrasion F 1

resistance and resistance to extrusion. -Co Extrusion must always be considered where high pressure is used. The proper d hardness may be selected from this chart by matching the fluid pressure with the a maximum extrusion gap.

60 Shore A is softer than 70.

, JAM u

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~~ =A r a" 70 Shore A is the standard. i 90 Shore A is very stiff.

p i-S

• oe (Ii;t "I e*.2 @0.0 0.04 IazMUMn Cp, inhCh The hardness of an elastomer is measured based on the depth of Indentation by a standard size and shape impacting gauge. The hardness Is obtained by comparing the difference between a small initial force and a much larger final force. The International Rubber Hardness Degrees (IRHO) scale has a range. of 0 to. 100, corresponding to elastic modulus of 0 (0) and Infinite (100);1 respectively. The measurement is made by Indenting a rigid ball into the rubber specimen.

The Shore A scale is the most prevalent in the United States. The readings range from 30 to 95 points. Harder elastomers use a pointed conical indentor with the Shore 0 scale. The results of the Shore A scale and the IRHD scale are approximately equal over the same range of resiliency. In elastomers with unusually high rates of stress relaxation or deformation hysteresis, the difference in dwell time in the two readings may cause different results. Also, the results of any hardness test depend on the elastomer thickness. Specified thickness should be used when conducting these tests.

Due to the mechanical limits of the test instruments, hardness measurements of elastomers are rarely expressed more precisely than 5 points.

The surface indentation or hardness usually does not bear any relation to the ability of an elastomeric part to function properly. Hardness is a measure of an elastomer's response to a small surface stress. Stiffness and compressive modulus measure the response to large stresses of the entire elastomeric part.

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