ML17335A273

Rev 0 to ST-307, Structural Evaluation of DC Cook Unit 2 Sgla Package.

ML17335A273
Person / Time
Site:	Cook
Issue date:	08/21/1998
From:	Bolyard V CHEM-NUCLEAR SYSTEMS, INC.
To:
Shared Package
ML17335A271	List: ML17335A270 ML17335A272 ML17335A273 ML17335A274 ML17335A275
References
ST-307, NUDOCS 9810140052
Download: ML17335A273 (20)

Text

CHEM-NUCLEAR SYSTEMS, LLC.

140 STONERIDGE DRIVE COLUMBIA, S.C. 29210 DESIGN DOCUMENT COVER SHEET DOCUMENT ID NUMBER: ST-307 REVISION NUMBER: 0 PROJECT NUMBER: 46628 SECURITY STATUS: PROPRIETARY NON-PROPRIETARY ~ x PERIOD: 'ife of the Pro'ect + 1 ear TITLE: Structural Evaluation of the D.C. Cook Unit 2 SGLA Packa e PREPARED BY: DATE: 81998 TITLE: Princi En ine REVIEWED BY: DATE:

TITLE: Senior Pro'ect En ineer REVISION NOTES:

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DOCUMENT CONTROL Received By:

Document Dated From: To: O 'P Verification to Index By: Dat'. S r Storage Shelf Location:

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140 STONERIDGE DRIVE COLUMBIA, S.C. 29210 .

DESIGN DOCUMENT REVIEW CHECKLIST Design Package Identification No ST-307 Date 8 19 98 Revision No.

ITEM YES 1.A Design Inputs such as design bases, regulatory requirements, codes, and standards are identified and documented.

1.B Effect of design package on compliance with the Safety Analysis Report or Certificate of Compliance identified and documented.

2. Revision numbers correct on the list of drawings?

3. Assumptions reasonable?

4. Appropriate analysis method used?

5. Correct values used from drawings?

6. Answers and units correct'

7. Summary of results matches calculations?

8. Material properties properly taken from credible references?

9. Figures match design drawings?

10. Computer input complete and properly identified'?

11. Documentation of all hand calculations attached?

12. Meeting minutes of the Design Review?

Not Applicable, Explain 1.B There is no SAR or Certificate of Compliance for this equipment.

7. Results are not summarized.

10. No computer analysis performed.

12. No design review meeting needed.

Independent Reviewer

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Title Structura Evaluation ofthe D:C: Cook Unit S.G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 1 of 10 OB JKCTIVK Structural evaluation of the D.C. Cook steam generator lower assembly (SGLA) package to demonstrate that its closures provide sufficient strength. to maintain their integrity during the transportation.

INTRODUCTION American Electric Power (AEP) company has replaced the steam generators at their D.C. Cook Unit 2 facility. The steam dome portions of the old steam generators (OSGs) (Reference 1) have been cut. The steam generator lower assembly (SGLA) packages will be transported to Barnwell South Carolina for disposal. These packages have been classified as SCO-II under 49 CFR Part 173 (Reference 2). Per 49 CFR 173.427, the SCO-II class materials are required to be shipped using IP-2 packages. Because of the unique size and shape of the SGLA, and controlled handling process during the transportation, an exemption from packaging requirement is requested from the DOT. A detailed handling and shipment plan is developed and will be adhered to during the transportation of these assemblies. The ability of this plan to provide an equivalent safety as that of an SCO-II object shipped in and IP-2 package forms the basis of this exemption request.

The SGLAs have several openings that have been welded shut for the transportation. These openings and their circumferential locations are listed in Table 1 and are shown in Figure 1. The details of the closure of these openings are shown in Reference 3. The cut end of the steam generators were closed using 3" thick end-plates that are welded to the body using 3/8" fillet welds. These welds were made according to AEP work plan but lack the quality assurance documentation. Therefore, additional attachment is provided by specially designed clips that are welded to the steam generator body and the endplate. Details of these clips are provided in Reference 4.

Evaluations are provided in this document that show that all the closures of the SGLA have sufficient structural strength to maintain their integrity under the loading expected during the transportation.

REFERENCES (1) CNS Drawing No. C-110-B-46628-001, Rev. 1, D.C. Cook Unit 2, Steam Generator General Layout.

(2) Code of Federal Regulations Title 49 Part 173.

(3) CNS Drawing No. C-110-B-46628-004, Rev.1, D.C. Cook Unit 2, Steam Generator Containment Details.

(4) CNS Drawing No. C-110-B-46628-003, Rev.1, D.C. Cook Unit 2, Steam Generator Shear Key and Shield Plate Tie-Bar.

(5) AISC, Steel ConstnIction Manual, Ninth Edition.

Title Structura valuation'of the D:C. Cook Unit 2 .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 2 of 10 (6) AAR Manual, Rev.9, Section No. 1, General Rules, 1993.

MATERIALPROPERTIES Shells Specification: ASME SA-516 Gr 70 Minimum Yield Strength, S = 38,000 psi Minimum Ultimate Strength, S = 70,000 psi

~d Cddd Specification: ASTM A-36 Minimum Yield Strength, S = 36,000 psi Minimum Ultimate Strength, S, = 58,000 psi Welds Rod Specification: E-70xx Electrodes Minimum Ultimate Strength, S= 70,000 psi ALLOWABLESTRESSES Stresses in the caps and plugs and the welds are conservatively based on the AISC (Reference 5) allowable values.

~CC Cd Allowable bending stress = 0.66 S= 24,000 psi Allowable shear stress = 0.4 S= 14,400psi Welds Allowable shear stress in fillet welds = 0.3 S = 21,000 psi EVALUATIONOF THE CLOSURES The closures of the steam generator package are evaluated for the largest acceleration the may experience during the transportation. The largest acceleration that the SGLA would

'ackage experience during the entire process of shipping and handling is during the rail transportation.

According to the general rules of AAR (Reference 6), these accelerations are 3g in the longitudinal direction, 2g in the lateral direction, and 2g in the vertical direction. Conservatively,

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Title Structura valuation of"the D:C. Cook Unit .G.L.A. Packa e Caic. No. ST-307 Rev. 0 Sheet 3 of 10 3g acceleration is assumed to occur in all directions and the closures are analyzed for this loading.

It is also assumed that the mass of the components used for closing the opening during storage-plates, manways, handholes lid, etc. - apply the inertia loading to the closures.

Prima Inlet 4 Outlet Nozzle Closures The primary inlet and outlet nozzle closures (Figure2) are made of two items:

Item - 1: 50.5 in Dia >< i/4 in thick plate. Its weight is, W, = (z/4) x5Q 5 xQ 25x (1/12) x49Q = 142 lbs Item - 2: 50.5 in Dia >< '/4 in thick >< 26 in long'hell. It weight is, Wb ~x50 Sx0 25x26x (1/12) x490 = 293 lbs Total closure weight = 142 + 293 = 435 say 450 lbs Conservatively assume that the coverplate has a dia of 50.5 in and thickness of 2.5 in. Then, the coverplate weight, W = (z/4)F50 5 ><2,5x (1/12) x490 = 1,420 lbs, say 1,5QQ lbs The inertia load in a direction normal to the '/4 in plate will be reacted by the edge shear. The shear stress in the plate is:

w = 3 x(450+1 500)/(~x50 5 x0 25) = 148 psi << 14,400 psi The plate is welded to the shell with a full penetration weld which will have strength equal to or larger than the base metal. The welds between the shell and the nozzle are 3/16" fillet which will develop a shear stress, tNcia = 3 x(450+1 500)/(~x50 Sx0 707x3/16) = 278 psi << 21,000 psi The inertia load in the plane of the coverplate, will cause bending and shear load at the base of the shell. Conservatively assuming that the entire mass is located at the end of the shell, the bending moment at the base of the shell is:

M = 3><(450+1,500)><26 = 152,100 in-lb Bending stress in the shell, ob a;,s = 152,100/[x><(50.5/2) <0.25] = 304 psi << 24,000 psi Shear stress in the shell, g = 3x(450+1 500)/(xx50 Sx0 25) = 147 psi << 14,400 psi

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Title Structur valuation.'of, the.D.C. Cook Unit .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 4 of 10 Shear stress in the weld caused by bending moment, wb~a;,s = 152,100/[z>(50.5/2) ><0.707X3/16] = 573 psi Shear stress in the caused by the shear force, z<,

3x(450+1 500)/(7rx50 5x0 707x3/16) = 278 psi Combined shear stress, x =573+278 = 851 psi < 21,000psi Manwa Closures The manway closures (Figure 3) are made of two items:

Item-1: 28 in Dia >< '/4 in thick plate. Its weight is, W, = (rr/4) x28 x0.25x (1/12) x490 = 44 ]bs Item-2: 28 in Dia < '/4in thick >< 6.5 inlong shell. Itweightis, Wb rrx28x0.25x6 5x (1/12) x490 = 41 ll" Total closure weight = 44+ 41 = 85 say 100 Ibs Conservatively assume that the manway has a dia of 28 in and thickness of 6.5 in. Then, the manway weight, W = (rr/4)x28 <6.5x (1/12) x490 = 1,135 lbs, say 1,200 lbs The inertia load in a direction normal to the '/4 in plate will be reacted by the edge shear. The shear stress in the plate is:

x = 3 x(100+1 200)/(rr x28xO 25) = 177 psi << 14,400 psi The plate is welded to the shell with a full penetration weld which will have strength equal to or larger than the base metal. The welds,between. the. shell and-the nozzle are '/4 in fillet-which will develop a shear stress, tNela = 3x(100+1 200)/(rrx28x0 707x 1/4) = 251 psi << 21,000 psi The inertia load in the plane of the coverplate, will cause bending and shear load at the base of the.

shell. Conservatively assuming that the entire mass is located at the end of the shell, the bending moment at the base of the shell is:

M =3><(100+1,200)><6.5 = 25,350 in-Ib

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Title Structura valuation of the D:C. Cook Unit 2 .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 5 of 10 Bending stress in the shell, G~gdjgs

= 25~350/[7t (28/2) 0.25] = 1 65 psi << 24,000 psi Shear stress in the shell, q = 3x(100+1 200)/(zx28x0 25) = 177 psi << 14,400 psi Shear stress in the weld caused by the bending moment, trna' = 25,350/[R><(28/2) X0.707><1/4] = 233 psi Shear stress in the weld caused by the shear force.

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= 3 x(100+1,200)/(itx28x0 707x 1/4) = 251 psi I

Combined shear stress, x = 233 + 251 = 484 psi < 21,000 psi Handhole Blowdown Shell Drain and Water Level Nozzle Closures These closures have the same design details as the manway closures. Since they are much smaller in size than the manway closure, the stresses calculated for the manway closure envelop the stresses in these closures.

End late Cli s Eight clips (Figure 4), in addition to the 3/8" fillet weld around the circumference hold the endplates of the SGLAs. These clips are designed to provide restraint to the endplate against 3g acceleration in all directions without relying on the endplate to steam generator weld. The endplates are 176 in diameter, 3 in thick that weigh, Wp = z/4><176 ><3><490/12 = 20,696 lbs say 21,000 lbs The eight clips share the inertia load normal to the plate surface equally. Therefore, load on each clip is:

P = 3X21,000/8 = 7,875 Ibs

Title Structura valuation of the D.C. Cook Unit .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 6 of 10 6"

6" vl trees sreeoon lsreo sees This load causes the shear of section AA. The average shear stress over this section is:

<=7,875/(6xl) = 1,313 psi << 14,400 psi The welds on the horizontal end react to this load. Assuming that only the weld legs parallel to the load react to it, the shear stress in the weld is:

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7 875/(2x8x0 Sx0 707) = 1,392 psi <<21,000 psi The inertia load parallel to the plane of the endplate is assumed to be reacted by only two clips that are parallel to the direction of the load. In this case the loading on the clips are as follows:

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e/2 Sorer sreeo on toree snees ut fores ereeo on eoree sees The loading on each clip is:

P =3x21,000/2 = 31,500 lbs

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Title Structural valuation of the D.C'. Cook Unit 2 .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 7 of 10 Shear stress on section BB is:

x = 31,500/(6xl) = 5,250 psi << 14,400 psi Bending stress on section BB is:

h ob d;s=31,500 3 6/(1 6) = 15,750psi < 24,000psi To calculate the maximum stress in the weld group on the steam generator, the entire group of weld is assumed to react the 31,500 load and the two 8 in legs only are assumed to react to the bending moment. The stresses due to these two effects are added to obtain the maximum weld stress. Shear stress due to 31,500 lbs force.

'if ~ 3 1,500/(22x0. 5><0.707) = 4,050 psi Shear stress in the weld due to bending moment, .

z,,, = 31,500@8/(6><8@0.5x0.707) = 14,851 psi Combined shear stress, z = 4,050+ 14,851 = 18,901 psi < 21,000 psi CONCLUSIONS It has been shown in this report that all the closures of the SGLA have adequate strength to react to the load normally expected during its handling and transportation. The stress allowables based on the AISC criteria are satisfied by all the components of the closure assembly with a large margin of safety. SGLAs will be, therefore, completely sealed and behave like a unitized body for which exemption from packaging may be requested from DOT.

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Title Structura valuation of the D.C: Cook Unit .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 8 of 10 Table 1- Location of the Protrusions on the D.C. Cook SGLA Protrusion Circumferential Location from the Top (Degrees)

Primary Inlet Nozzle 36.3 Primary Outlet Nozzle 143.7 Handhole No.1 90 Handhole No.2 270 Primary Manway No. 1 308.7 Primary Manway No.2 241.7 Blow-Down Nozzle No.1 90 Blow-Down Nozzle No.2 270 Shell Drain 206.3 Water Level Tap 126.7 End Plate Notes:

(1) 3" End-plate is used to close the cut end of the SGLA.

Title Structura valuation of the-D.C: Cook Unit 2 .G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 9 of 10 po 0 0 0 0 0 o Hanway {2) + Primary Nozzle {2) 270'O OO 9 0'00 Blow-Down Nozzle Blow-Down Nozzle I Mater Level Tap Shell Drain Nozzle 180'i ure-1 D.C. Cook SGLA Protrusion Location MT 50.5" MT 26" S/~6 Fi ure-2 Prima Nozzle Cover Details

VA Title Structural Evaluation of the D.C. Cook Unit 2 S.G.L.A. Packa e Gale. No. ST-307 Rev. 0 Sheet 10 of i0 28" MT I g 1/4 T(P 3 1/4 6 1/2 1

I Fi ure-3 Manwa Cover Details MT 3 SIDES 1/2 45 Typ 3 SIDES yP 1/2 22.5 I 5R.

S.G. 75.13'i ure-4 End-Plate Attachment Details

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