ML101040082
| ML101040082 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 04/13/2010 |
| From: | Price J Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 09-4238, GL-04-002 | |
| Download: ML101040082 (26) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 April 13, 2010 Serial No.
NLOS/GDM Docket Nos.
U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 09-4238 R1 50-280 50-281 License Nos. DPR-32 DPR-37 VIRGINIA ELECTRIC AND POWER COMPANY SURRY POWER STATION UNITS 1 AND 2 NRC GENERIC LETTER 2004-02 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RESULTS OF FINITE ELEMENT ANALYSIS OF PIPE INSULATION JACKETING AND BAND SPACING By letter dated December 17, 2009 (ADAMS ML093521426), Virginia Electric and Power Company (Dominion) provided its response to an NRC request for additional information (RAI) for Surry Power Station (Surry) Units 1 and 2 regarding its resolution of the issues identified in Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors.
In the response to RAI question number 2, Dominion committed to address the difference in band spacing and jacket material used in the Surry containments for encapsulating pipe insulation with the band spacing and jacket material used in the Ontario Power Generation (OPG) air jet impact testing. To address the differences, Dominion performed finite element analysis (FEA) modeling to demonstrate that the stresses induced on the jacketing due to a high energy line break (HELB) would be significantly less than the tensile strength of the stainless steel jacketing and bands used in the Surry Units 1 and 2 containments.
The FEA evaluation is summarized in the attachment. The evaluation: 1) documents the differences in piping insulation/jacketing responses due to the different band spacing and jacketing material used in the OPG testing versus the band spacing and jacketing material installed in the Surry Units 1 and 2 containments, and 2) documents that the maximum stresses in the jacketing material and bands used in the Surry insulation jacketing configurations are less than the material allowables.
The FEA evaluation includes bounding cases that provide reasonable assurance that the stainless steel jacketing configurations installed in the Surry Units 1 and 2 containments on asbestos and calcium-silicate insulation would maintain their structural integrity and intended functionality under impingement from a HELB jet.
Serial No. 09-4238 Docket Nos. 50-280/281 Page 2 of 3 Should you have any questions or require additional information, please contact Mr. Gary D. Miller at (804) 273-2771.
Sincerely, n
rice Pr sident - Nuclear Engineering Commitments made in this correspondence:
None
Attachment:
Finite Element Analysis of Stainless Steel Jacketing and Band Spacing for In-Containment Piping Insulation, Surry Power Station Units 1 and 2 COMMONWEALTH OF VIRGINIA COUNTY OF HENRICO
)
)
)
,2010.
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by Mr. J. Alan Price, who is Vice President - Nuclear Engineering, of Virginia Electric and Power Company.
He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this /3*/f day of.....do yo; I I
My Commission Expires: )\\\\A\\I 3, ~ 0 I 0 VICKI L. HULL Notary Public commonwealth of Virginia l
140542
~
My Commission Expires May 31. 2010
~
1 ~
Notary Public
cc:
U.S. Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Avenue NE Suite 1200 Atlanta, Georgia 30303-1257 NRC Senior Resident Inspector Surry Power Station Ms. K. R. Cotton NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 8 G9A 11555 Rockville Pike Rockville, MD 20852-2738 Dr. V. Sreenivas NRC Project Manager - North Anna U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 8 G9A 11555 Rockville Pike Rockville, MD 20852-2738 Serial No. 09-4238 Docket Nos. 50-280/281 Page 3 of 3
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment FINITE ELEMENT ANALYSIS OF STAINLESS STEEL JACKETING AND BAND SPACING FOR IN-CONTAINMENT PIPING INSULATION SURRY POWER STATION UNITS 1 AND 2 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 1 of 22 Finite Element Analysis of Stainless Steel Jacketing and Band Spacing for In-Containment Piping Insulation Surry Power Station Units 1 and 2 Purpose & Applicability By letter dated December 17,2009 (ADAMS ML093521426), Virginia Electric and Power Company (Dominion) provided its response to an NRC request for additional information (RAI) for Surry Power Station (Surry) Units 1 and 2 regarding its resolution of the issues identified in Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors. In the response to RAI question number 2, Dominion committed to disposition the difference in band spacing and jacket material used in the Surry containments for encapsulating pipe insulation versus the band spacing and jacket material used in the Ontario Power Generation (OPG) Air Jet Impact Testing (AJIT). To address the differences, Dominion stated that it would perform finite element analysis (FEA) modeling to demonstrate that the stresses induced on the jacketing due to a high energy line break (HELB) would be significantly less than the tensile strength of the stainless steel jacketing used at Surry. The FEA modeling and evaluation have been completed and the results are provided below.
References 1.0 NRC Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors," September 13,2004.
2.0 Nuclear Energy Institute (NEI) document NEI 04-07 Rev. 0, December 2004, "Pressurized Water Reactor Sump Performance Evaluation Methodology."
3.0 NRC's SER to NEI 04-07, Safety Evaluation by the Office of Nuclear Reactor Regulation Related to NRC Generic Letter 2004-02, "Pressurized Water Reactor Sump Performance Evaluation Methodology," Volume 2, December 6,2004.
4.0 OPG Test Report N-REP-34320-10000, Revision 0, "Jet Impact Tests - Preliminary Results and their Application", Ontario Power Generation, April 2001.
5.0 AISC Manual of Steel Construction, 8th Edition.
6.0 Surry Specification SUI-0009, Revision 4, "Installation of Thermal Insulation."
7.0 Surry Specification NUS-0117, Revision 5, "Thermal Insulation."
8.0 Surry Calculation ME-0777, Rev.1, "Debris Generation due to LOCA within Containment for Resolution of GSI-191."
9.0 STAAD.Pro 2007, Finite Element Structural Analysis & Design Program, Sargent &
Lundy Program Number 03.7.745-7.4, QA Verified Program.
10.0 DOM001-RPT-002, Rev. 0, Including Add 001, "Report on Surry Unit 1 Containment Building Walkdowns for Emergency Sump Strainer Issues", October 7,2003. (Enercon Services) 11.0 DOM001-RPT-003, Rev. 0, "Report on Surry Unit 2 Containment Building Walkdowns for Emergency Sump Strainer Issues", May 24,2004. (Enercon Services)
Serial No. 09-423B Docket Nos. 50-280/281 Attachment Page 2 of 22 12.0 Marks Standard Handbook for Mechanical Engineers, i h Edition, McGraw-Hili Book Company.
13.0 ASTM Designation: C1423-98, "Standard Guide for Selecting Jacketing Materials for Thermal Insulation."
14.0 ASTM Designation: A240/A240M-09, "Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications."
15.0 DOM001-RPT-003-BINDER1, Rev. 0, Add. 001, "Surry Unit 2 Debris Walkdown Packages S2-DWD-001A through S2-DWD-006D."
16.0 DOM001-RPT-003-BINDER2, Rev. 0, Add. 001, "Surry Unit 2 Debris Walkdown Packages S2-DWD-006E through S2-DWD-010M."
17.0 DOM001-RPT-003-BINDER3, Rev. 0, Add. 001, "Surry Unit 2 Debris Walkdown Packages S2-DWD-010N through S2-DWD-017G."
18.0 DOM001-RPT-003-BINDER4, Rev. 0, Add. 001, "Surry Unit 2 Debris Walkdown Packages S2-DWD-018A through S2-DWD-032A."
19.0 DOM001-RPT-003-BINDER5, Rev. 0, Add. 001, "Surry Unit 2 Debris Walkdown Packages S2-DWD-032B through S2-DWD-MISC."
Design Inputs 1.0 The insulation jacketing configuration for the baseline model (Model 1) simulates the test samples used in the OPG Test Report (Reference 4.0). The configuration of the test samples used in the OPG Test Report is described below.
Test samples installed on 2 inch nominal diameter pipe, Test samples included 1 inch thick calcium-silicate (cal-sil) insulation, 0.016 inch thick Aluminum 1100 jacketing, and Secured with 0.5 inch wide by 0.020 inch thick stainless steel bands spaced 8 inches apart.
2.0 The ultimate tensile strength of Aluminum 1100 is 13 ksi (Reference 12.0).
3.0 The insulation jacketing installed on calcium silicate (cal-sil) and asbestos (AS) insulation at Surry Power Station is type 304 or 316 stainless steel (Reference 6.0).
The ultimate tensile strength, as specified by the Standard Handbook for Mechanical Engineers (Reference 12.0), for both types 304 and 316 stainless steel is 85 ksi. The Standard Handbook uses the book of ASTM Standards for its source of material properties.
The ASTM designations C1423 and A240 (References 13.0 and 14.0) document the material composition and properties used for stainless steel sheet metal. ASTM A240 identifies that for type 304 and 316 stainless steel the tensile strength is 75 ksi.
However, there are certain subtypes of 304 and 316 stainless steel with a tensile strength upwards of 90 ksi.
This analysis is performed utilizing an ultimate tensile strength of 85 ksi for the stainless steel jacketing systems at Surry Power Station. However, for completeness the results of this analysis are evaluated against a tensile strength of 85 ksi and 75 ksi.
Eq.#1 Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page3 of 22 4.0 Insulation stiffness values (From Pittsburgh Corning Product Brochures).
Insulation Type Compressive Strength at Young's Modulus - Ec 5% Deformation (lbs/irr')
(psi)
Asbestos (Unibestos) 12.5 250 Cal-Sil 100 2000 Young's Modulus for cal-sil and asbestos is calculated using compression strength of insulation for 5% strain (i.e. for asbestos Ec =12.5/0.05 =250 psi).
5.0 lone of Influence (lQI) and destruction pressure for insulation materials (References 3.0 and 8.0).
Insulation System Type lOI (Note 1)
Corresponding Destruction Pressure (psi)
Cal-Sil wi Stainless Steel 5.450 24.0 Jacketing Asbestos wi Stainless 7.00 20.6 Steel Jacketing Note1: D represents the pipe diameter in feet of the hypothetical Loss of Coolant Accident (LOCA) break.
6.0 Calculation of spring constants (K) used to model the radial stiffness of the insulation material in the FEA.
For a typical Finite Element Model (FEM) node representing the jacketinglinsulation components, the radial stiffness can be calculated as follows:
Radial stiffness of typical node:
F K=-
!1T Where:
K =spring constant in Ibslin for FEM nodes F =radial force applied at the FEM node f1T=compressive deformation of insulation thickness under load F, (in)
The relationship between stress (0) and strain (E) of a linear elastic material can be written as:
E _O'_F/A c -
& - !1T/T Rearranging Eq. #2, F
A*Ec
=----
!1T T
Eq.#2
Serial No. 09-4236 Docket Nos. 50-280/281 Attachment Page 4 of 22 Where:
A =Insulation area per node
_ ;r. Dill. L N
Ec =Compression Young's Modulus of Insulation (psi)
Dm =mean diameter of the insulation (in) =DOD + T DOD =outside diameter of pipe (in)
L = length of the model (in) = clear span + band width N =number of nodes on the surface area of the jacketing in FEA models T = insulation thickness, (in)
From Eq. #1 and #2, K = ;r. Dill.L. Ee N
T Example spring constant calculation for Model 1 (P02T1CS).
K = ;r *3.375.8.75. 2000 = 89.641b/in 2070 1
Note 1: The length (L) for Models 8 to 14 IS the length of the clear span only. This IS conservative as it slightly reduces the spring constant.
Model #
ID Pipe DOD T
L Spring Size (in)
(in)
(in)
(in)
- Constant, K (Ibs/in) 1 P02T1CS 2
2.375 1
8.75 89.64 2
P02T2CS 2
2.375 2
18.75 124.50 3
P08T3CS 8
8.625 3
18.75 220.54 4
P12T4CS 12 12.75 4
18.75 238.32 5
P02T2AS 2
2.375 2
18.75 15.56 6
P08T3AS 8
8.625 3
18.75 27.57 7
P12T4AS 12 12.75 4
18.75 29.79 8
P14T4CS21L 14 14.00 4
21.00 286.84 9
P14T4CS24L 14 14.00 4
24.00 327.82 10 P14T4AS21L 14 14.00 4
21.00 35.86 11 P14T4AS24L 14 14.00 4
24.00 40.98 12 P14T4AS24LB 14 14.00 4
24.00 40.98 13 P02T2AS24LB 2
2.375 2
24.00 19.92 14 P12T4AS18LB 12 12.75 4
18.00 28.60
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 5 of 22 Discussion 1.0 FEA Model Representation FEA was used to simulate the impact of a HELB jet on the stainless steel jacketing system installed on cal-sil and asbestos insulated pipes in the Surry containments.
The FEA models developed were used to simulate the potential failure mechanism shown in the OPG test report (Reference 4.0). The OPG test report documented that the mode of failure from a HELB jet was exclusively tearing of the jacketing due to pressure acting on the edge of the jacketing seam. The pressure acting on the jacketing seam initiated a peeling effect, where the jacketing was torn along the contact edge of the banding straps securing the insulation to the pipe. The OPG test report documented an FEA model that confirmed the failure mechanism seen in testing. The failure mode documented in the OPG test report FEA model was jacketing tearing due to the high stresses induced in the jacketing along the band interface. The FEA model documented the Von Mises stress in the aluminum jacketing along the band interface peaked at 13 ksi. The peak Von Mises stress equaled the ultimate tensile stress for Aluminum 1100 (13 ksi).
This evaluation compares the same parameters as the OPG test report. In this evaluation the maximum Von Mises stress in the jacketing material is compared to the ultimate tensile strength of the jacketing material.
2.0 Methodology The FEA evaluated the insulation jacketing system installed on cal-sil and asbestos insulation in the Surry containments. The analysis was performed using FEA program STAAD.Pro 2007 (Reference 9.0). Fourteen (14) three-dimensional (3-D) FEM (Finite Element Models) were developed. The models consisted of 3-noded and 4-noded plate (shell) elements with 6 degrees of freedom per node, and radial elastic springs representing insulation stiffness and contact characteristics with the jacketing.
Plate (shell) elements were used to model the jacketing and band straps. Elastic radial springs are used to model the insulation stiffness characteristics using the specified modulus of elasticity of insulation. The springs act only under compression forces to accurately represent the insulation material contacUinterfacing with the jacketing and band materials.
Plant Configuration Per Specification SUI-0009 (Reference 6.0), the jacketing system used at Surry is type 304 or 316 stainless steel jacketing secured with 0.75 inch wide by 0.02 inch thick (3.0 Assumptions) stainless steel bands spaced 18 inches apart. The stainless steel jacketing can be 0.010,0.016, or 0.020 inch thick depending on the level of personnel traffic in the location of the pipe.
The insulation systems installed within the Surry Units 1 and 2 containments were inventoried during the 2003 and 2004 refueling outages and documented in References 10.0 and 11.0. Subsequent to the initial inventory, insulation modifications were performed as a result of the GL 2004-02 effort. The modifications installed stainless steel jacketing on previously cloth jacketed asbestos and oal-sil insulated piping. The changes to the insulation systems were documented and included as Addendum 001 to the debris inventory
SerialNo. 09-423B DocketNos. 50-280/281 Attachment Page6 of 22 reports (References 10.0 and 11.0).
The insulation inventory was reviewed, and it was determined that cal-sil and asbestos insulation is installed on pipes varying in diameter from 0.75 to 14 inches. The majority of the cal-sil and asbestos insulation is installed on pipes 2 inch NPS (Nominal Pipe Size).
Only one 14 inch NPS pipe has asbestos insulation installed. Additionally, it was determined that asbestos and cal-sil insulation installed on pipes greater than 2 inches in diameter are jacketed with 0.016 inch thick stainless steel or greater. The 0.010 inch thick stainless steel sheets are only used on select pipes 2 inches in diameter or less.
FEA Models To evaluate the Surry stainless steel jacketing configuration, a baseline FEA model was created to reproduce the jacketing system tested in the OPG test report. The jacketing system used in this analysis to model the OPG tested jacketing system was 0.016 inch thick aluminum 1100 jacketing secured with stainless steel bands. The bands were 0.75 inch wide by 0.02 inch thick and spaced approximately 8 inches apart edge to edge.
In addition to the baseline model, thirteen FEA models were created to evaluate the Surry specific jacketing assembly installed on cal-sil and asbestos insulation materials. The thirteen models were created to evaluate the jacketing system installed on different piping configurations at Surry. The jacketing system used at Surry and modeled in this analysis is type 304 stainless steel jacketing secured by either 0.50 or 0.75 inch wide by 0.02 inch thick stainless steel bands spaced 18 inches apart (Reference 6.0 and Assumptions 3.0). The stainless steel jacketing evaluated in the FEA models was either 0.010 or 0.016 inch thick.
Table 2.1 documents the models analyzed and the corresponding parameters.
Per specification SUI-OOOg (Reference 6.0), the bands are installed to maintain a maximum center to center distance of 18 inches. The FEA evaluates jacketing configurations with bands spaced 18, 21, and 24 inches apart to bound potential plant configurations. FEA Models 8 to 13 had bands spaced 21 and 24 inches apart.
FEA models for four representative pipe sizes were chosen to limit the scope of the FEA.
The FEA models were simulated on pipe sizes of 2,8, 12, and 14 inches. Table 2.1 below provides a list of the fourteen FEA models analyzed.
Table 2.1 - FEA Models Serial No. 09-4238
~~v""d No:> 50-280/28 i Attachment Page 7 of 22 Model Description ModellD Pipe Jacketing Insulation Insulation Band Band Number Size Thickness Material Thickness Clear Width (in)
(in)
(in)
Spacing (in)
(in) 1 Baseline Model - OPG Test Case P02T1CS 2
0.016 Cal-Sil 1
8 0.75 2
88 Jacketing on 2" Pipe with Cal-Sillnsulation P02T2C8 2
0.016 Cal-Sil 2
18 0.75 (Note 1) 3 88 Jacketing on 8" Pipe with Cal-Sil Insulation P08T3CS 8
0.016 Cal-8il 3
18 0.75 (Note 1) 4 88 Jacketing on 12" Pipe with Cal-Sillnsulation P12T4C8 12 0.016 Cal-Sil 4
18 0.75 (Note 1) 5 88 Jacketing on 2" Pipe with Asbestos Insulation P02T2A8 2
0.016 Asbestos 2
18 0.75 (Note 1) 6 88 Jacketing on 8" Pipe with Asbestos Insulation P08T3A8 8
0.016 Asbestos 3
18 0.75 (Note 1) 7 88 Jacketing on 12" Pipe with Asbestos Insulation P12T4A8 12 0.016 Asbestos 4
18 0.75 (Note 1) 8 S8 Jacketing on 14" Pipe with Cal-Sillnsulation P14T4CS21L 14 0.016 Cal-8il 4
21 0.75 (Note 1) 9 88 Jacketing on 14" Pipe with Cal-Sillnsulation P14T4CS24L 14 0.016 Cal-8il 4
24 0.75 (Note 1) 10 88 Jacketing on 14" Pipe with Asbestos Insulation P14T4AS21L 14 0.016 Asbestos 4
21 0.75 (Note 1) 11 88 Jacketing on 14" Pipe with Asbestos Insulation P14T4AS24L 14 0.016 Asbestos 4
24 0.75 (Note 1) 12 8S Jacketing on 14" Pipe with Asbestos Insulation P14T4AS24LB 14 0.016 Asbestos 4
24 0.50 (Note 1) 13 88 Jacketing on 2" Pipe with Asbestos Insulation P02T2AS24LB 2
0.010 Asbestos 2
24 0.50 (Note 1) 14 88 Jacketing on 12" Pipe with Asbestos Insulation P12T4AS18LB 12 0.010 Asbestos 4
18 0.50 (Note 1)
Note 1: A representative insulation thickness was selected from References 10.0 and 11.0 for a specified pipe size.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 8 of 22 Industry guidance has determined, through jet impingement testing, the distance where insulation systems will become debris from a postulated LOCA break. This distance is defined as the lOI radius. The lOI radius for cal-sil and asbestos insulation is shown in Design Input 5.0. The lOI radius correlates the LOCA break pressure to the pressure at a distance (lOI radius) from the break location. The correlation between lOI radius and destruction pressure is shown in Table 1-3 of Appendix I to Reference 3.0. The insulation destruction pressures listed in Design Input 5.0 are used in the FEA models with the respective insulation types.
HELB Jet Orientation The OPG test report documented that the critical orientation for jacketing failure was when a jet blast was offset 45° from the horizontal jacketing seam. Therefore, each of the FEA models simulates a jet blast offset 45° from the horizontal seam of the overlapping portion of the jacketing. The simulated HELB jet effects are imposed on the FEA models as pressures Pl, P2, and P3 shown in Figure 1. Figure 1 is shown below to illustrate the simulated blast scenario.
Fi ure 1 - HELB Jet Orientation t
I Z I
K I
I I
I I
I I
I I
P:l I
I I
I I
t' I
Typical Insulation 45° I
Spring, Compression I
',Only y
- - - - - -\\- - - - -
- - - - - ~- - - - - - - - - - - - - - - - - - - - - - ~
\\
//
\\
/
\\
/
\\
//
45°"
/
\\
/
\\
//
\\
/
\\
/
\\
/
V
/
/
/
/
/
/
/
/
/
p,
/
Jet Flow Seam Pressure, P2 (P2 =-P3)
Seam HELB Jet
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 9 of 22 FEA Model Group Numbering To differentiate the components of the FEA model, plate elements are labeled in group numbers. The grouping is the same between all 14 models. Figures 2 and 3 together with Table 2.2 describe the grouping used in the modeling.
Fi ure 2 - FEA Model Grou IIf-
% the Band Width Group PL2 Clear Span
,-;~-!"--~~--ZT7~~Z~J-~-/,
--\\\\-\\ -\\-\\"-\\\\ -1\\ -1\\"-1
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\
\\\\\\\\\\\\\\\\
\\\\\\\\
~114---~-
% the Band Width Group PL6 Fi ure 3 - FEA Model Grou r--....,..--~<:----==-~--==---=-....=--.,..-----;----;--~\\
\\
\\
\\
\\
\\
\\
\\
_~~_Oi~\\
Group PL3
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 10 of 22 Table 2.2 - FEA Model Groups FEA Groups Group Description PL1 Group designates the plate elements for the entire portion of jacketing that is not impacted by jet pressure.
PL2 Group designates the plate elements for the jacketing directly impacted by the HELB jet blast (90 0 Cylindrical Section).
PL3 Group designates the plate elements for the portion of overlapped jacketing that is impacted by the seam pressure (Outward).
PL4 Group designates the plate elements for the portion of pipe jacketing that is impacted by the seam pressure (Inward).
PL5 Group designates the plate elements for the portion of overlapped jacketing that is not impacted by the seam pressure PL6 Group designates the plate elements for the band straps.
Each FEM includes one span of pipe between two bands. The Boundary Condition (BC) of the FEM at both ends includes radial and longitudinal (local Z-axis or global X-axis) springs.
The rotations at both ends of the FEM are set free to conservatively maximize jacketing stresses.
FEA models for cal-sil insulation have common nodes for group PL1 and group PL6 at the boundary condition of both ends. However, FEA models for asbestos do not have common nodes for group PL1 and group PL6 at the boundary condition of both ends for the circumferential area under external pressure (total of 60 degrees). This is due to correctly modeling the asbestos behavior under external pressure. Asbestos has a softer spring constant compared to cal-sit insulation; therefore, it experiences a larger deformation under HELB jet pressure. This will cause the jacket (group PL1) to separate from the band (group PL6) when the external pressure is applied to the jacket (group PL2).
The spring constant of each FEM is calculated using the insulation compressive modulus of elasticity, insulation thickness, insulation length, insulation average diameter and the number of FEM nodes. This calculation has been performed in Design Input 6.0. The spring constants of FEA models are summarized in Design Input 6.0. The springs included in the models act radially over the entire FEM.
Pressure Applied to Overlapped Seam The HELB jet impacts the insulation jacketing at a 45 0 offset from the seam. The jet stream impacts the jacketing material and is diverted around the jacketing material. The peeling effect on the overlapped jacketing section shown in the OPG test report is the result of the higher pressure (normal to the jacketing surface) inside the seam overlap to that outside of the seam overlap. This net differential pressure caused the failure of the jacketing system used in the OPG test report. The net pressure differential between the inside and outside of the seam overlap is applied to the overlap section (Group PL3) as P2 and to the inner pipe jacketing section (Group PL4) as P3 (equals negative P2).
The baseline model (P02T1CS) has been iteratively analyzed to find the corresponding seam pressure P2 and P3 (see Figure 1) that causes jacketing failure. Jacketing failure happens when the maximum stress in group PL3 reaches the ultimate tensile stress for aluminum of 13 Ksi. This pressure has been determined to equal 0.96 psi.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 11 of 22 The pressure determined through the iterative process (equal to 0.96 psi) has been applied to the five FEA models that include the same insulation type (cal-sil) as the baseline model.
This pressure, P2 and P3, has been adjusted for the five FEA models that include asbestos insulation.
The models are adjusted by the ratio of the external jet destruction pressure for asbestos to cal-sil insulation (see Design Input 5.0). The adjusted pressure is applied to the asbestos FEA models at the same region as the baseline model. The seam pressure for models with asbestos insulation is equal to:
PAsbestos =(20.6 psi /24 psi)
- 0.96 psi =0.824 psi Load Cases Applied There are three pressure loads applied to each model. The three loads are listed below.
Figure 1 shows the location of the 3 pressure loads.
Pressure load 1 (P1) is applied to Group PL2. This pressure load is for the direct pressure force exerted by the HELB jet blast.
Pressure load 2 (P2) is applied to Group PL3. This pressure load is applied outward on PL3 and simulates the pressure force that causes the jacketing peeling effect.
Pressure load 3 (P3) is applied to Group PL4. This pressure load is applied inward on PL4.
Table 2.3 - Model Loads FEAModel P1 (psi)
P2 (psi)
P3 (psi) 1
-24.0 0.96
-0.96 2
-24.0 0.96
-0.96 i
3
-24.0 0.96
-0.96 i
4
-24.0 0.96
-0.96 I
-20.6 0.824
-0.824 i
5 i
i 6
-20.6 0.824
-0.824 I,
7
-20.6 0.824
-0.824 8
-24.0 0.96
-0.96 9
-24.0 0.96
-0.96 10
-20.6 0.824
-0.824 11
-20.6 0.824
-0.824 12
-20.6 0.824
-0.824 13
-20.6 0.824
-0.824 14
-20.6 0.824
-0.824 The three pressure loads are linearly summed and imposed on the model.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 12 of22 3.0 Assumptions 3.1 The band dimensions per SUI-0009 (Reference 6.0) can be 0.5 inch wide by 0.02 inch thick for piping up to 12 inches in diameter and 0.75 inch wide by 0.02 inch thick for piping 12 inches in diameter and greater. This evaluation uses bands 0.75 inch wide by 0.02 inch thick for the baseline model (Model 1) and Models 2 through 11.
To understand the effect of using 0.5 inch wide bands for piping up to 14 inches in diameter, Model 12 (P14T4AS24LB) has been developed. This model is a bounding analysis for large bore pipes with 0.5 inch wide bands. The results of the analysis are discussed in Section 5.0.
3.2 The stainless steel jacketing material per SUI-0009 can be either type 304 or 316 stainless steel. This evaluation uses type 304. The ultimate tensile strength for these material types is the same; therefore, this assumption does not impact the results.
3.3 The same Compression StrengthlYoung's Modulus value corresponding to 5%
strain has been used for strains higher than 5%. Compression Strength generally increases with higher strain; therefore, using a Young's Modulus value corresponding to 5% strain in this evaluation would yield conservative results.
4.0 Acceptance Criteria The jacketing system is considered to be qualified for the prescribed ZOI radii specified in Design Input 5.0 if the following criterion is met:
The maximum Von Mises stress in the jacketing material is less than the ultimate tensile strength of the jacketing material. The ultimate tensile strength is shown in Design Inputs 2.0 and 3.0.
5.0 Results Stress plots were performed and the results documented for each model. The results of this analysis are summarized in the tables included in Sections 5.1, 5.2, and 5.3 below. Section 5.1 summarizes the results for each model and compares the maximum stress ratio to the ultimate tensile strength of 85 ksi.
Section 5.2 summarizes the results and compares the maximum stress ratio to an alternate stainless steel ultimate tensile strength of 75 ksi. (Refer to Design Input 3.0 for a discussion of the tensile strength of stainless steel.) Section 5.3 summarizes the models and their corresponding load capacity ratios (UCs).
5.1 Summary Tables - Stainless Steel Tensile Strength 85 ksi Table5 1 - Baseline Model Results - Model 1*
Description P02T1CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 2.80 4.47 12.97 3.07 4.10 9.16 Stress (Ksi)
Allowable Stress (Ksi) 13 13 13 13 13 85 UC Ratio 0.22 0.34 0.998 0.24 0.32 0.11 Max Displacement 0.019 0.022 0.057 0.013 0.014 0.02 (in)
Insulation Max Strain 1.90 2.20 N/A 1.30 1.40 N/A
(%)
- Baseline model reaches the onsetof failure stresses.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 13 of 22 2" p'
/2" Th' k C I S'II I tl M d 12 Tbl 52 0016"Th'kJ keti a
e IC ac e Ing on ipe w IC a - I nsu a Ion -
o e Description P02T2CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 7.60 15.39 32.12 9.95 9.69 14.84 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.09 0.18 0.38 0.12 0.11 0.17 Max Displacement 0.046 0.05 0.141 0.031 0.035 0.043 (in)
Insulation Max Strain 2.30 2.50 N/A 1.55 1.75 N/A
(%)
8" p'
/3" Th' k C I S'II I f M d 13 T bl 53 0016" Th' k J k f a e IC ac e mq on ioe w IC a - I nsu a Ion -
o e Description P08T3CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 11.05 28.92 43.21 11.60 13.88 23.28 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.13 0.34 0.51 0.14 0.16 0.27 Max Displacement 0.079 0.074 0.428 0.05 0.055 0.079 (in)
Insulation Max Strain 2.63 2.47 N/A 1.67 1.83 N/A
(%)
12" p'
/4" Th' k C I S'II I ti M d 14 T bl 54 0016"Th' kJ k f a e IC ac e Ing on ipe w IC a - I nsu a Ion-o e Description P12T4CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 12.72 35.38 46.42 13.02 16.42 28.97 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.15 0.42 0.55 0.15 0.19 0.34 Max Displacement 0.116 0.10 0.652 0.074 0.077 0.116 (in)
Insulation Max Strain 2.90 2.50 N/A 1.85 1.93 N/A
(%)
2" p'
/ 2" Th' k A btl I f M d I 5 T bl 55 0016"Th' kJ k f a e IC ac e Ing on ipe w IC s es os nsu a Ion-o e Description P02T2AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 16.92 25.92 40.51 21.30 14.29 27.62 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LIe Ratio 0.20 0.30 0.48 0.25 0.17 0.32 Max Displacement 0.229 0.274 0.226 0.175 0.174 0.263 (in)
Insulation Max Strain 11.45 13.70 N/A 8.75 8.70 N/A
(%)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 14 of 22 k
bl 56 Ta e. - 0.016" Thick Jac etinq on 8 Pipe wI 3" ThickAsbestos Insulation - Model6 Descriotion P08T3AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 19.37 33.51 48.24 19.18 18.03 42.73 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.23 0.39 0.57 0.23 0.21 0.50 Max Displacement 0.389 0.415 0.514 0.26 0.26 0.392 (in)
Insulation Max Strain 12.97 13.83 N/A 8.67 8.67 N/A
(%)
M d 17 1.
kA b 12"P' k
bl 57 0
Ta e. -
.016 Thick Jac etinq on IPe w/4 Thic s estos nsuation -
o e Description P12T4AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 21.92 41.19 52.03 21.64 20.20 48.48 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.26 0.48 0.61 0.25 0.24 0.57 Max Displacement 0.578 0.566 0.799 0.397 0.399 0.578 (in)
Insulation Max Strain 14.45 14.15 N/A 9.93 9.98 N/A
(%)
8 kC 1 S'II k
bl 8
Ta e 5. - 0.016' Thick Jac etinq on 14 PipewI 4" Thic a-Insulation - Model Description P14T4CS21 L FEM Grouo PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 15.57 41.18 53.25 15.64 18.33 34.45 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.18 0.48 0.63 0.18 0.22 0.41 Max Displacement 0.123 0.103 0.883 0.081 0.086 0.123 (in)
Insulation Max Strain 4.10 3.43 N/A 2.70 2.87 N/A
(%)
M d 19 14" Th' k C I S'II I f 14"P' bl 59 0016"Th' k k f Ta e. -
I nsua Ion-o e Description P14T4CS24L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 18.32 46.11 60.5 18.26 20.28 38.74 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.22 0.54 0.71 0.21 0.24 0.46 Max Displacement 0.126 0.103 1.124 0.083 0.095 0.126 (in)
Insulation Max Strain 4.20 3.43 N/A 2.77 3.17 N/A
(%)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 15 of 22 M d 110 1 r
/4" Thl kA b t
14" p.
T bl 510 0016" Th* k J k tl a e.
IC ac e Inq on ioe w IC s es as nsua Ion-a e Description P14T4AS21 L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 23.20 50.49 57.50 22.81 21.02 53.46 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.27 0.59 0.68 0.27 0.25 0.63 Max Displacement 0.614 0.591 1.036 0.418 0.418 0.614 (in)
Insulation Max Strain 15.35 14.78 N/A 10.45 10.45 N/A
(%)
M d 111 I r
/4" Thi k A b t
14" p' T bl 5 11 0016" Th" k J k ti a e.
IC ac e mq on ipe w IC s es as nsua Ion-a e Description P14T4AS24L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 24.25 59.00 63.36 23.44 21.89 55.56 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.29 0.69 0.75 0.28 0.26 0.65 Max Displacement 0.623 0.599 1.27 0.421 0.413 0.623 (in)
Insulation Max Strain 15.58 14.98 N/A 10.53 10.33 N/A
(%)
The results of Tables 5.2 - 5.11 show that the maximum LlC ratio is 0.75 (Model 11 -
PL3). Therefore, the stresses in the Surry jacketing configurations remain under the allowable stress levels.
The Tables 5.2 - 5.11 results also indicate that structural integrity would be maintained for either cal-sil or asbestos insulation installed on piping up to 14 inches in diameter, with 0.016 inch thick stainless steel jacketing, using 0.75 inch wide bands spaced at a maximum distance of 24 inches.
Model 11 is the controlling finite element (FE) model; therefore, Model 12 has been developed using Model 11 to investigate the effects of using 0.5" wide bands on calculated LlC values. Per Specification SUI-0009, 0.5 inch wide bands are used on piping smaller than 12 inches NPS and 0.75 inch wide bands on pipes 12 inches NPS and greater. Therefore, Model 12 is a hypothetical case used to bound plant configurations. Model 12 results are presented in Table 5.12.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 16 of 22 d I 1 I.
14" Thi k A b 14" P' T bl 512 0016" Th' k J k r a e.
IC ac e InQ on tpe w IC s estos nsuation-Mo e 2
Description P14T4AS24LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 26.18 40.43 63.51 26.85 26.34 49.26 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.31 0.48 0.75 0.32 0.31 0.58 Max Displacement 0.649 0.624 1.293 0.442 0.435 0.649 (in)
Insulation Max Strain 16.23 15.60 N/A 11.05 10.88 N/A
(%)
a e
.010 Thick Jac etinoon 2" PipewI 2" Thick Asbestos Insulation - Model 13 Description P02T2AS24LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 22.38 36.87 74.80 28.48 21.30 50.96 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.26 0.43 0.88 0.34 0.25 0.60 Max Displacement 0.271 0.322 0.607 0.219 0.232 0.297 (in)
Insulation Max Strain 13.55 16.10 N/A 10.95 11.60 N/A
(%)
The maximum LlC ratio in Model 12 is 0.75. Model 12 is considered the controlling FE model for large bore piping representing cal-sil or asbestos insulations on piping up to 14 inches in diameter, with 0.016 inch thick stainless steel jacketing, using 0.50 inch wide bands spaced at a maximum distance of 24 inches.
Some of the small bore pipes (S 2 inches) insulated in asbestos or cal-sil have been jacketed with 0.010 inch stainless steel. Models 13 and 14 have been created to evaluate the effect of using stainless steel jacketing with a thickness of 0.010" rather than the 0.016" or thicker material.
The results summary for Model 13 (P02T2AS24LB) is presented in Table 5.13.
T bl 513 0
k The results of Table 5.13 show that the maximum LlC ratio is 0.88. Therefore, the results shown in Table 5.13 demonstrate the acceptability of the small bore piping (S 2 inches) configurations in use at Surry.
Model 14 was created to evaluate a limiting pipe size that can be insulated with asbestos or cal-sil and jacketed with 0.010 inch thick stainless steel. Model 14 results are presented in Table 5.14.
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 17 of 22 M d 114 12" p' 14" Th' k A btl I f T bl 514 0010" Th' k J k ti a e IC ac e Ing on me w IC s es os nsua Ion-o e Description P12T4AS18LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 29.38 34.22 76.53 29.62 30.57 61.65 Stress (Ksi)
Allowable Stress (Ksi) 85 85 85 85 85 85 LlC Ratio 0.35 0.40 0.90 0.35 0.36 0.73 Max Displacement 0.679 0.606 1.758 0.521 0.516 0.679 (in)
Insulation Max Strain 16.98 15.15 N/A 13.03 12.90 N/A
(%)
The results of Table 5.14 show that the LlC ratio is 0.90. The results of Table 5.14 demonstrate that a 12 inch pipe insulated in asbestos. jacketed in 0.010 inch thick stainless steel. and secured with bands 0.5 inch wide spaced 18 inches apart would maintain its insulation jacketing structural integrity.
5.2 Summary Tables - Stainless Steel Tensile Strength 75 ksi Table 5.15-Baseline Model Results - Model 1*
Description P02T1CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 2.80 4.47 12.97 3.07 4.10 9.16 Stress (Ksl)
Allowable Stress (Ksi) 13 13 13 13 13 75 LlC Ratio 0.22 0.34 0.998 0.24 0.32 0.12 Max Displacement 0.019 0.022 0.057 0.013 0.014 0.02 (in)
Insulation Max Strain 1.90 2.20 N/A 1.30 1.40 N/A
(%)
- Baseline model reaches the onset of failure stresses.
M d 12 12" Th' k C I S'II I tl 2" p' T bl 516 0016" Th' k J k tl a e IC ac e InQ on ipe w IC a -
I nsu a Ion-o e Description P02T2CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 7.60 15.39 32.12 9.95 9.69 14.84 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.10 0.21 0.43 0.13 0.13 0.20 Max Displacement 0.046 0.05 0.141 0.031 0.035 0.043 (in)
Insulation Max Strain 2.30 2.50 N/A 1.55 1.75 N/A
(%)
SerialNo. 09-4238 DocketNos. 50-280/281 Attachment Page 18 of 22 a" p' 13" Th' k C I S'II I f M d 13 T bl 517 0016" Th' k J k f a
e IC ac e Inq on roew IC a - I nsu a Ion -
o e Description P08T3CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 11.05 28.92 43.21 11.60 13.88 23.28 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75
.75 75 75 LlC Ratio 0.15 0.39 0.58 0.15 0.19 0.31 Max Displacement 0.079 0.074 0.428 0.05 0.055 0.079 (in)
Insulation Max Strain 2.63 2.47 N/A 1.67 1.83 N/A
(%)
12"p' 14" Th' k C I S'II I ti M d 14 T bl 518 0016"Th' kJ k f a
e IC ac e Ing on ipe w IC a - I nsu a Ion -
o e Description P12T4CS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 12.72 35.38 46.42 13.02 16.42 28.97 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.17 0.47 0.62 0.17 0.22 0.39 Max Displacement 0.116 0.10 0.652 0.074 0.077 0.116 (in)
Insulation Max Strain 2.90 2.50 N/A 1.85 1.93 N/A
(%)
2" p'
/2" Th' k A btl I ti M d 15 T bl 519 0016"Th' kJ k f a
e IC ac e mo on ice w IC s es os nsu a Ion -
o e Description P02T2AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 16.92 25.92 40.51 21.30 14.29 27.62 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.23 0.35 0.54 0.28 0.19 0.37 Max Displacement 0.229 0.274 0.226 0.175 0.174 0.263 (in)
Insulation Max Strain 11.45 13.70 N/A 8.75 8.70 N/A
(%)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 19 of 22 Table 5.20 - 0.016"Thick Jacketing on 8" PipewI 3" Thick Asbestos Insulation-Model 6 Description P08T3AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 19.37 33.51 48.24 19.18 18.03 42.73 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.26 0.45 0.64 0.26 0.24 0.57 Max Displacement 0.389 0.415 0.514 0.26 0.26 0.392 (in)
Insulation Max Strain 12.97 13.83 N/A 8.67 8.67 N/A
(%)
M d 17 14" Thl k A btl I f 12" P' T bl 521 0016" Th' k J k ti a e IC ac e mgon ioe w IC s es os nsu a Ion-o e Description P12T4AS FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 21.92 41.19 52.03 21.64 20.20 48.48 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.29 0.55 0.69 0.29 0.27 0.65 Max Displacement 0.578 0.566 0.799 0.397 0.399 0.578 (in)
Insulation Max Strain 14.45 14.15 N/A 9.93 9.98 N/A
(%)
M 18 kC I S'II I'
Table 5.22 - 0.016"Thick Jacketmq on 14' PipewI 4" Thic a -
I nsu ation -
ode Description P14T4CS21 L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 15.57 41.18 53.25 15.64 18.33 34.45 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.21 0.55 0.71 0.21 0.24 0.46 Max Displacement 0.123 0.103 0.883 0.081 0.086 0.123 (in)
Insulation Max Strain 4.10 3.43 N/A 2.70 2.87 N/A
(%)
M d 19 I
"Th' k C I S'I 1 I f 1 "p' k
Table 5.23 - 0.016" Thick Jac etinq on 4 ipe w 4 IC a -
I nsu a Ion-o e Description P14T4CS24L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 18.32 46.11 60.5 18.26 20.28 38.74 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.24 0.61 0.81 0.24 0.27 0.52 Max Displacement 0.126 0.103 1.124 0.083 0.095 0.126 (in)
Insulation Max Strain 4.20 3.43 N/A 2.77 3.17 N/A
(%)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 20 of 22 T bl 524 0016" Th' keti a e.
ick Jac etino on 14 Pipe w/4" ThickAsbestos Insulation - Model 10 Description P14T4AS21 L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 23.20 50.49 57.50 22.81 21.02 53.46 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.31 0.67 0.77 0.30 0.28 0.71 Max Displacement 0.614 0.591 1.036 0.418 0.418 0.614 (in)
Insulation Max Strain 15.35 14.78 N/A 10.45 10.45 N/A
(%)
14"P'
/ 4" Thi k A btl I ti M d I 11 T bl 525 0016" Th' k J k f a e.
IC ac e InQ on ipe w IC s es as nsua Ion-a e Description P14T4AS24L FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 24.25 59.00 63.36 23.44 21.89 55.56 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.32 0.79 0.84 0.31 0.29 0.74 Max Displacement 0.623 0.599 1.27 0.421 0.413 0.623 (in)
Insulation Max Strain 15.58 14.98 N/A 10.53 10.33 N/A
(%)
14"p.
/ 4" Th* k A btl I f M d I 12 T bl 526 0016" Th* k J k f a e.
IC ac e Ing on ipe w IC s es as nsua Ion -
a e Description P14T4AS24LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 26.18 40.43 63.51 26.85 26.34 49.26 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.35 0.54 0.85 0.36 0.35 0.66 Max Displacement 0.649 0.624 1.293 0.442 0.435 0.649 (in)
Insulation Max Strain 16.23 15.60 N/A 11.05 10.88 N/A
(%)
2" P'
/ 2" Th' k A btl I f M d I 13 k
Table 5.27- 0.010" Thick Jac etinq on ipe w IC s es as nsua Ion-o e Description P02T2AS24LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 22.38 36.87 74.80 28.48 21.30 50.96 Stress (Ksi)
Allowable Stress (Ksi) 75 75 75 75 75 75 LlC Ratio 0.30 0.49 0.997 0.38 0.28 0.68 Max Displacement 0.271 0.322 0.607 0.219 0.232 0.297 (in)
Insulation Max Strain 13.55 16.10 N/A 10.95 11.60 N/A
(%)
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 21 of 22 M d 114 I tl
/4" Thl k A b t
12" P' T bl 528 0010" Th' k J k f a
e IC ac e InQ on ipe w IC s es os nsu a Ion -
o e Description P12T4AS18LB FEM Group PL1 PL2 PL3 PL4 PL5 PL6 Max Von Mises 29.38 34.22 76.53 29.62 30.57 61.65 Stress (Ksl)
Allowable Stress (Ksi) 75 75 75 75 75 75 LIe Ratio 0.39 0.46 1.02 0.39 0.41 0.82 Max Displacement 0.679 0.606 1.758 0.521 0.516 0.679 (in)
Insulation Max Strain 16.98 15.15 N/A 13.03 12.90 N/A
(%)
a e
ummary 0 aximurn atlo or o es Model Pipe Insulation Jacketing Band Band LlC Ratio LlC Ratio Number Size Material Thickness Clear Width (Section 5.1)
(Section 5.2)
(in)
(in)
Spacing (in)
(in) 1 2
Cal-Sil 0.016 8
0.75 0.998 0.998 2
2 Cal-Sil 0.016 18 0.75 0.38 0.43 3
8 Cal-Sil 0.016 18 0.75 0.51 0.58 4
12 Cal-Sil 0.016 18 0.75 0.55 0.62 5
2 Asbestos 0.016 18 0.75 0.48 0.54 6
8 Asbestos 0.016 18 0.75 0.57 0.64 7
12 Asbestos 0.016 18 0.75 0.61 0.69 8
14 Cal-Sil 0.016 21 0.75 0.63 0.71 9
14 Cal-Sil 0.016 24 0.75 0.71 0.81 10 14 Asbestos 0.016 21 0.75 0.68 0.77 11 14 Asbestos 0.016 24 0.75 0.75 0.84 12 14 Asbestos 0.016 24 0.50 0.75 0.85 13 2
Asbestos 0.010 24 0.50 0.88 0.997 14 12 Asbestos 0.010 18 0.50 0.90 1.02 5.3 Overall Summary Table Table 5.29 provides a summary of each of the fourteen FEA models and the corresponding maximum load capacity ratio from Sections 5.1 and 5.2.
T bl 5 29 S
f M' LlC R
. f FEA M d I
Serial No. 09-4238 Docket Nos. 50-280/281 Attachment Page 22 of22 Conclusions The results provided above demonstrate that twelve of the thirteen FEA models created for the Surry insulation jacketing configurations remain below a UC ratio of 1.0. Model 14 slightly exceeds the UC ratio of 1.0 and provides the upper bounds of an acceptable jacketing configuration as discussed in greater detail below. These results demonstrate that for each configuration analyzed, there is reasonable assurance that the jacketing system's structural integrity would be maintained under the simulated LOCA jet conditions.
For large bore piping (> 2 inches NPS), Model 12 represents the bounding analysis. The results summarized in Section 5.0 above demonstrate that the jacketing system for a 114 inch diameter pipe insulated in asbestos (asbestos is the controlling insulation for this analysis), jacketed in 0.016 inch stainless steel, and secured with bands 0.5 inch wide spaced 24 inches apart would maintain its structural integrity. Per Specification SUI-0009, the stainless steel bands used at Surry for this application are 0.75 inch wide, rather than the 0.50" bands assumed in this model, for piping ~ 12 inches NPS. Additionally, the bands are to be spaced at a maximum span of 18 inches. Therefore, this model represents the bounding analysis for the plant insulation jacketing configuration on large bore piping.
For small bore piping (:5 2 inches NPS), Model 13 bounds the plant configuration. The results summarized in Section 5.0 above demonstrate that the jacketing system for a 2 inch diameter pipe insulated in asbestos, jacketed in 0.010 inch stainless steel, and secured with bands 0.5 inch wide spaced 24 inches apart would maintain its structural integrity. Per Specification SUI-0009, the stainless steel bands used at Surry for this application are to be spaced at a maximum span of 18 inches, rather than the 24 inches assumed in the model.
Therefore, this model represents the bounding analysis for the plant insulation jacketing configuration on small bore piping.
Model 14 was developed to establish an upper bound on the pipe size that could be jacketed in 0.010 inch thick stainless steel and maintain its structural integrity. Model 14 demonstrates that a jacketing system for a 12 inch diameter pipe insulated in asbestos, jacketed in 0.010 inch stainless steel, and secured with 0.5 inch wide bands spaced 18 inches apart would slightly exceed (by approx. 2%) the qualification requirements needed to maintain its structural integrity. This configuration (12 inch diameter pipe with asbestos insulation and 0.010 inch stainless steel jacketing) is not installed in the Surry Units 1 and 2 containments. The 0.010 inch stainless steel jacketing is used on small bore ~ 2-inch diameter) piping.
This evaluation demonstrates the differences in piping insulation I jacketing responses due to the different band spacing used in the OPG testing versus the band spacing installed at Surry. This evaluation also documents that the maximum stresses expected to be imposed in the jacketing material and bands for the Surry in-containment insulation jacketing systems due to LOCA jet conditions are less than the material allowables.