ML20237H205
| ML20237H205 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/28/1987 |
| From: | Beltz I TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20237H199 | List: |
| References | |
| CEB-CI-21.89, NUDOCS 8709030163 | |
| Download: ML20237H205 (7) | |
Text
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UNCONTROL' LED COPY CIVIL ENGINEERING BRANCH INSTRUCTION CEB-CI 21.8'9 MODIFICATION PRIORITIES FOR PIPE SUPPORTS ON TITLE.
RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUOYAH This document consists of 3 pages.
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,a COORDINATION LOG Document No.:
MODIFICATION PRIORITIES FOR PIPE
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SUPPORTS ON RTGCROUSt,Y ANAT,YZED CATEGORY I PIPING Aevision: 0 R-Oenotes review A-Oenotes approval.
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MODIFICATION PRIORITIES FOR PIPE SUPPORTS ON RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUO7AH UNIT 2 y;n,,
Date DESCRIPTION OF REVISION 4,,,..o Revision no.
0 Original Issue 1
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AUG 28 '87 14: 13 (615) 632-4519 P.5 MODIFICATION PRIORITIES FOR PIPE SUPPORTS CEB-CI-21.89 ON RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUOYAH UNIT 2 TABLE OF C0tEENTS
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1.0 PURPOSE........................
1 2.0 SCOPE.............................
1 3.0 PRIORITIZATION EVALUATION CRITERIA..............
3 4.0 DOCUMENTATION.........................
3 5.0 REFERENCE...........................
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Q AUG 28 '8'7 14: 13 (615) 632-4519 P,6 CEB-CI-21.89 MODIFICATION PRIORITIES FOR PIPE SUPPORTS ON RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUOYA!! UNIT 2 1.0 PURPOSE The purpose of this instruction is to provide engineering guidelines for implementing Sequoyah Unit 2 restart criteria (Reference 1) as applicable to pipe support modifications for rigorously analyzed Category I piping
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(Reference 4).
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These guidelines shall apply to all pipe supports on rigorously analyzed j
Category I piping systems for which pipe support modifications are requiredi f.e., any physical modification of a pipe support required as a j
result of the supports inability to qualify according to Design Criteria SQN-DC-V-24.2 (Reference 2).
Support modifications will be prioritized into two groups; those that require implementation prior to Unit 2 restart (pre-restart modifications) and those that may be implemented after restart (post-restart modifications).
f 3.0 PRIORITIZATION EVALUATION CRITERIA 3.1 Load Combinations and Pipinr. Movements.
For prioritization the proposed pipe support modifications shall be i
evaluated only for the faulted loading condition in accordance with SQN-DC-V-24.2.
3.2 Allowable Limits The following limits shall be used to establish priorities for pipe support modifications.
3.2.1 Linear Supports:
The support member stresses shall not exceed the lessor of
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1.2 Sy and 0.7 Su for tensile and flexural stresses, and 90 percent of the critical buckling stress as defined in AISC
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specification (Reference 3) for compressive loads.
stresses shall not exceec eo percent ut allowabic otrecc for
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tensile and flexure stresses.
3.2.2 Standard Support Components:
These shall meet the faulted allowables of SQN-DC-V-24.2 3.2.3 Nonstandard component support bolting:
The stress allowables for bolting shall be the minimum specified yield stress (10 percent higher than faulted allowables in Reference 2).
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i CEB-CI-21.89 MODIFICATION PRIORITIES FOR PIPE SUPPORTS ON RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUOYAll UNIT 2 1
3.2 Allowable Limits (Continued) 3.2.4 Concrete Expansion Anchorss The minimum factors of safety for concrete expansion anchors shall be 2.5 for wedge-type and 2.8 for shell-type.
3.2.5 Load Sharing Between Supports:
For supports that do not meet t';e interim allowable stress criteria presented herein and are not adjacent to an eauipment nozzle, an anchor, a penetration, an active valve, 3
or a body / stem-supported valve, a case-by-case evaluation may l
I be performed that considers redistribution of load to adjacent supports. The effect of load redistribution on piping stress shall be considered by simple hand calculations.
3.2.6 Constant and Variable Spring Supports:
Shall be evaluated to accommodate the " maximum pipe movement" without bottoming out (see Reference 2).
3.2.7 Pipe to Pipe Support gaps Supports with pipe to pipe support total gap which exceed i
1/2-inch shall be modified prior to restart to assure the total gap is equal to or less than the installation requirement of 5/32-inch maximum total gap.
In addition, the first support adjacent to equipment nozzles, anchors, i
penetrations, and active valves and body or stem-supported valves shall be modified before restart if the total gap exceeds the installation requirement of 5/32-inch maximum total gap (Reference 6).
l 3.2.8 System Review For pipe supports that do not meet the criteria contained in this procedure, a case-by-case piping system operability review, consistent with the Technical Specification (justification for continued operation) may be performed as follows:
Assume that the support fails and evaluate the piping to ensure that primary stress in the piping is less than 2 Sy and secondary stress in the piping meets ASME Section III equations 10 or 11 allowables.
Or, where piping secondary stresses exceed equation 10 and 11 allowables, they shall be shown to meet an augmented Class 2 and 3 fatigue evaluation (Reference 5).
Alternatively, the piping strains shall not exceed the limits of Code Case N-47, Appendix T.
The adjacent pipe supports shall meet allowables given in this criteria document.
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AJI 28 '87 11115 (615) 632-4519 P,8 CES-CI-21.89 MODIFICATION PRIORITIES FOR PIPE SUPPORTS O!! RIGOROUSLY ANALYZED CATEGORY I PIPING - SEQUOYA!! UNIT 2 4.0 DOCUMENTATION Engineering evaluations performed to determine the priority of modifications shall be documented in calculations performed in accordance with the applicable QA requirements.
50 REFERENCE Hemorandum from S. A. White to Those listed dated March 13. 1987, 1.
" Restart Requirement Criteria," A02 870313 001 Pipe Support Design Criteria for Rigorously Analyzed Category I 2.
Piping, SQN-DC-V-24.2 Specification Tor the Design, Fabrication, and Erection of Structural 3.
Steel Buildings, AISC November 1, 1978 Program Plan for Calculation Regeneration of Pipe Supports on 4
Rigorously Analyzed Category I Piping - Sequoyah Unit 2 Mark I A/E group. " Report for Mark I Containment Program Augmented 5.
Class 2/3 Fatigue Evaluation Method and Results for Typical Torus Attached and SRV Piping Systems," November 1982, HPR-751 Letter from R. L. Cloud J.ssociates to TVA " Position Paper on Pipe to 6.
Support Gap Limit," Letter No. P154-3 L-020, August 25, 1987 l
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