ML20141K139

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Pipe Stress & Pipe Support Qualifications Action Plan
ML20141K139
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 09/10/1985
From: Klause R
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20141K130 List:
References
15454, NUDOCS 8601220262
Download: ML20141K139 (8)
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J.O. No. 15454 t

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) TEXAS LTILITIES GENERATING CO. (TUCCO)

CONANCHE PEAR STEAM ELECTRIC STATION l

PIPE STRESS AND PIPE SUPPORT QUALIFICATIONS i

- ACTION PLAN u

$s f W/DCWf PROJECT ENGINEER i

PROJECT MANAGER s

l, er i 8601220262 B g 10ADOCK O M 45 l PDR PDR l

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00036-1545405-N1 1

c Comanche Peak Steam Electric Station c

$ Pipe Stress and Pipe Support Qualification s-

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ACTION PLAN y A. INTRODUCTION This plan identifies Stone & Webster Engineering Corporation's (SWEC) f; actions to address technical concerns on the piping and pipe support designs in the Comanche Peak Steam Electric Station (CPSES). The action c

( plan draws upon SWEC's experience, resources and technical expertise in i

the qualification of piping and pipe support systems in modern nuclear

) power plants. This work will be accomplished in a controlled manner i

under the SWEC Corporate Quality Assurance Program which complies with 10CFR50, Appendix B, NRC Regulatory Guides, and CPSES FSAR.

4 Upon initiation of the project, the work will proceed without hold points

for approval by outside parties. If new technical issues are raised in
the area of piping and supports, SWEC will address them in parallel with the requalification production effort.

Complete implementation of this action plan will demonstrate the technical adequacy and compliance with all current licensing committeents 7

of the piping and pipe support designs at the Comanche Peak Steam Electric Station.

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  1. This effort will be overviewed by the TUGC0 Project and the Comanche Peak Response Team (CPRT). This overview will not relieve SWEC of the responsibility for fully qualifying the piping and supports in their
final modified condition.

B. OBJECTIVE AND SCOPE I

g Stone & Webster will qualify all ASME Class 2 and 3 piping systems and i

supports in accordance with appropriate procedures, practices, technical techniques and controls.

The scope of the piping and support qualification program will include:

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  • Reanalysis of small bore (2" and under) ASME piping and J s supports on a sampling basis to verify adequacy.

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  • Verification of structural and system inputs to ensure complete integrity of the piping and support process.
  • Verification of the validity of data provided by/to other design entities.

The above program will adequately address concerns raised including those by the NRC, Cygna, and CASE.

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00036-1545405-N1 l C. OUTLINE Cf ACTION PIAN The Stone & Webster Action Plan consists of the following six elements:

3. Development of Comanche Peak Pipe Stress and Pipe Support i

Design Criteria

2. Verification of As-built Information
3. Review and Verification of Systes Design Input, Seismic Acceleration, and Fluid Transients
4. Verification of Existing Pipe Support Design Documents
5. Resolution of Special Technical Concerns
6. Requalification of Piping Systems and Pipe Support Designs.

Any modifications required to supports will be carefully controlled by TUCCO's Repair Replacement Activity of ASME Section XI. '

Details of each element of the action plan is provided in the following section.

D. ACTION PLAN DETAILS

1. Resolution of Special Technical Concerns Special technical concerns at the CPSES may be separated into three I categories:

a) Technical concerns which will be adequately addressed by

, existing SWEC technical procedures.

No further action is required since reanalysis using standard SWEC procedures will automatically resolve these technical concerns. Imamples of these technical concerns are piping computer model mass point spacing, consideration of pipe support mass, significant modal contribution, damping values, frictional forces on supports, local stress, skewed fillet

, welds, and rotational restraint of axial supports.

b) Technical concerns which must be addressed before finalizing the piping requalification effort.

These are special issues which will have a significant effect on the overall pipe stress analysis effort and are constraints to finalizing the piping reanalysis. Examples of these concerns are pipe support stiffness, stability of pipe supports, the effectiveness of U-bolt supports and the effects of U-bolts on local stresses.

SWEC will establish special task force (s) with experienced pipe stress and pipe support engineers to address these issues. The task force (s) will review all past project efforts expended for

.g.

00036-1545405-N1 l

the resolution of these technical concerns and reconnend to l l

SWEC management further actions to close out the resolution l l

effort. The review and reconnendations will inclute document review and field walkdown by experienced pipe stress engineers t to identify supports which are difficult to qualify, physical j removal of the pipe supports, in situ or laboratory test / qualification of pipe supports, further analysis or .

hardware modification.

! As an option, some of the supports in question may be

j. identified before stress reanalysis and an attempt made to delete them from the computer model. Upon successful completion of the reanalysis, such supports may be physically remo?ed or modified to provide a technically sound resolution

' to the technical concerns raised even 'though the original  :

design may be acceptable.

c) Technical concerns which must be resolved before completion of the pipe stress and pipe support requalification effort. .

These are technical concerns which specifically address the adequacy of some support designs. They have no effect on the pipe stress analysis effort 'and therefore need not be a l

constraint to the pipe stress requalification effort. However, [

it is anticipated that substantial technical expertise is r l, required to resolve these concerns and an approach similar to the one described in Item b above will be utilized to resolve these concerns. Examples of these concerns are: cinched U-bolts, wall to wall supports and Richmond inserts.

Development of Comanche Peak Pipe Stress and Pipe Support Design 2.

Criteria (Comanche Peak Project Procedure (CPPP) - 7)

Existing SWEC technical guidelines and procedures for pipe stress analysis and pipe support design will be incorporated directly or by reference into a single Comanche Peak Pipe Stress and Pipe Suoport Design Criteria docuent (CPPP-7). Resolutions of the special technical concerns identified in Item 1 above will also be incorporated as they become available. Furthermore, recent code

! cases and inquiries (e.g., Code Case N-411 on damping and Code Case 413 on minimum weld size) may be implemented if NRC approval is granted and if their implementation is considered appropriate. . This document will be used on all pipe stress and pipe support i requalification on this. project. 'The use of this criteria document-will ensure uniformity of work and technical quality.

3. Verification of As-Built Information SWEC will perform a sample verification of existing as-built piping j stress packages documentation -to ensure the acceptability and completeness of the physical dimensions to be used in- the pipe stress reanalysis. Esecution of this effort will follow the Field Walkdown Procedure CPPP-5 established for this project. Sample size will meet 95/95 confidence criteria of MIL STD 105D in validating conformance to the acceptance tolerances established.

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00036-1545405-N1 1

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4. Review and Verification of System Design input, and Systes Fluid Transients SWEC will review all ASME Class 2 and 3 piping drawings to ensure that all subsystems are evaluated. Systes design specifications will be reviewed to ensure that the FSAR commitments. the proper operating modes, system pressure and temperature, and the appropriate fluid transients are considered in the pipe stress i analyses. An assessment will be made for each identified fluid transient to determine its ef fect oc the piping. New fluid induced forces will be generated, if required, for the piping analysis. To the extent practicable, the effects of the various fluid transients will be compared and enveloped to minimize the pipe stress reanalysis effort.

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5. Verification of Existing Pipe Support Design Documents l ,

I SWEC requalification program will verify the adequacy of all pipe  :

supports design. The requalification will be performed by either producing a complete new calculation or evaluating the exieting 1

project calculation. The evaluation method will fully review the existing calculation for technical adequacy and the structural integrity for the new loads. Additional SWEC computations may ,

include items not fully covered in existing calculations.  :

6. Requalification of Piping Systems and Pipe Support Designs Pipe stress reanalysis effort will follow project procedure CPPP-6
" Pipe Stress / Support Requalification Procedure" and CPPP-7 " Design Criteria for Pipe Stress and Pipe Support" for ASME Piping Systems.

The analysis will utilize the verified as-built and systes design input discussed in Items (3) and (4) above. New seismic response

! spectra consistent with the Pressure Vessel Research Committee (PVRC) recommended damping value (WRC-300 and ASME Code Case N411) may also be used. Whenever judged appropriate by the pipe stress

' engineer, pipe support optimization will be performed to eliminate unnecessary snubbers and supports which are subject to the special technical concerns (e.g., stability) discussed in Ites Ib. The l

l result of the pipe stress analysis will be used to evaluate the l

adeguacy of the supports, penetrations, and equipment nozzles.

j Valve accelerations will be compared to their qualified level to I assure operability. The new stress results will also be evaluated for consistency with the designed postulated pipe break locations.

The pipe support requalification effort will be performed by experienced pipe support engineers in accordance with project '

procedures CPPP-6 and CPPP-7. Every support design will be-requalified by SWEC. The requalification will be ~ performed by either producing a complete new calculation or using the verified ,

existing project calculation as the basis supplemented by additional.

calculations for new loads and items which may not have been fully covered in the existing calculation.

00036-1545405-N)

E. CLOSURE The completed calculations from the requalification effort will be the permanent documents of record for the plant. These calculations will provide technical justification for the structural integrity of the piping systems and supports.

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