Pipe Support Stiffness Analysis for Independent Verification of Sargent & Lundy Design| ML20081L326 |
| Person / Time |
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| Site: |
Byron  |
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| Issue date: |
07/11/1983 |
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| From: |
EG&G, INC. |
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| To: |
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| Shared Package |
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| ML20081L324 |
List: |
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| References |
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| SAFF-261-83, NUDOCS 8311160154 |
| Download: ML20081L326 (7) |
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Text
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Attachment
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. July 11, 1983 Saff-261-83 PIPE SUPPORT STIFFNESS ANALYSIS FOR INDEPENDENT VERIFICATION OF SARGENT AND LUNDY DESIGN BYRON UNIT NO. 1 A study was made to evaluate piping stress results using " infinite" stiffness values (1016) for supports versus " reasonable" stiffness values (10 ). The piping system used for this study was the auxiliary feedwater line (a) located in Byron Unit #1 of Commonwealth Edison Co. The reference (b) report prepared by Sargent & Lundy presents their stress analysis of the subject piping line. In that report nodal fixity was used to represent supports and anchor points. This is analogous to modeling the supports and anchors using infinite stiffness values (1016),
NUPIPE-II (c) was used for the EG&G analysis to model the piping system using 100% completed data as contained in reference (b). A computer plot of the NUPIPE model and microfiche of the computer output are attached.
A weight, pressure, and SSE (Safe-Shutdown Earthquake) analysis was per-formed for two different support conditions, as follows:
(a) all supports and anchors having " infinite" (10I0) stiffness.
(b) all supports and anchors having " reasonable" (1007) stiffness.
Tables were then prepared to compare Sargent & Lundy results with NUPIPE (1016) results and NUPIPE (1007) results. The tabulated results include support loads, anchor loads, and the 10 highest primary stresses (which were computed using 1974 ASME Code criteria for Class 2 systems).
I fs; G
Table 1 Primary Stresses per 1974 ASME Code i-EQ (9) Primary Stresses (psi)
Sargent & Lundy NUPIPE-II Sargent & Lundy (10)l6 NUPIPE (10)07 NUPIPE Node Pt. Node Pt.
- 5 5 17716 17783 11169 25B 26 12948 13200 13659 32 32 14739 14935 15829 34 34 13108 13425 14673 35A 36 11204 11565 12838
- 112 114 12447 11150 9365 30 30 22171 22138 23381 47 47 9281 9604 10833' 72 72 8512 8978 .9350 558 55 8447 8836 -9767 T
- Anchor Points Note that 112 is the pump discharge
Table 2 Support Loads - SSE Only Support Lo6ds (lb.)
Sargent & Lundy NUPIPE-II Sargent & Lundy (10)16 NUPIPE (10)07 NUPIPE Node Pt.
20 20 1408 1426 1122 34A 35 2333 2512 2238 40 40 949 932 929 47 47 Y-427 Y-436 Y-494 Z-1482 Z-1551 Z-1841 70 70 351 327 471 72 72 Y-702 Y-650 Y-858 l Z-1514 Z-1594 Z-1762 82 82 869 997 1055 87 87 862 914 836
)
98A 90 358 439 609 988 91 680 776 962-Table 3 Anchor Loads - SSE Only (lb.) (ft-lb.)
Resultant Forces i Moments Sargent & Lundy NUPIPE-II Sargent & Lundy (10)IO.NUPIPE (10)07 NUPIPE Anchor Pt. Anchor Pt. Fr Mr Fr Mr Fr 'Mr 5 5 2230 13970 2330 14590 1662 6930 112 114 1091 2650 942 2160 1335 1627
, The stress comparison is presented in Table 1. Tables 2 and 3 present
- the support and anchor load comparisons. Results of the comparisons indicate that
- 1. Piping stresses do not change significantly by using
" reasonable" stiffness versus " infinite" stiffness.
- 2. Support loads may or may not see a significant change.
One support for the test case had a load increase of 397 when the stiffness was changed to (1007) (NUPIPE node #90).
Note that this support has been examined and found to be adequate to withstand the additional load.
- 3. Anchor loads were reduced in value for the lower " reasonable" stiffness case.
In conclusion, results of the study indicate that the analysis procedures used by Sargent & Lundy adequately examine piping stresses per ASME Code criteria.
References:
(a) Sargent & Lundy Engineers, Subsystem #1AF08 h Rev. 6, Auxiliary Feedwater System, Project #4391-00, 4683-00 (b) Sargent & Lundy Engineers, " Addendum to Piping Stress Report", Commonwealth Edison Co., Byron Unit 1, 4391-00 Auxiliary Feedwater, lAF-08, Rev. 06F1, Addendum C, Accession No. 032667, 4-21-83 (c) Computer Program NUPIPE-II, Version 1.4.1, Program Module V4AGINL
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