ML20133N562
| ML20133N562 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/17/1985 |
| From: | Khan T, Taheri M ABB IMPELL CORP. (FORMERLY IMPELL CORP.), BECHTEL GROUP, INC. |
| To: | |
| Shared Package | |
| ML20133N500 | List: |
| References | |
| ERPT-M0001, ERPT-M0001-R01, ERPT-M1, ERPT-M1-R1, IEB-79-14, NUDOCS 8508130529 | |
| Download: ML20133N562 (20) | |
Text
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ATTACHMENT V
,[
BALANCE OF IE BULLETIN 79-14 EVALUATION FOR RANCHO SECO NUCLEAR GENERATING STATION SACRAMENTO MUNICIPAL UTILITY DISTRICT SACRAMENTO, CALIFORNIA ERPT - N0001 REVISION.1 JULY 16, 1985 i
8508130529 850B06 l
PDR ADOCK 050 2
S Prepared by:
MN N ~7 Vfff G. <
-% s b d i j
Masoua Taheri Jy V. McColligan Lead Senior Engineer (Imp' ell)
Principal Pr6fect Engineer
~7.! !k[
dM
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d wO
/7 Taj Knan L. R. Ke11 man, Manager 7
l Engineering, Supervisor (Bechtel)
Nuclear Engineering I
shMM; h
CONTROL NO.:
l Davic Accott Supervising Engineer, Mechanical ISSUED TO:
[.
TABLE OF CONTENTS PAGE 1.0 PURPOSE 3
2.0 SCOPE 3
3.0 BACKGROUND
3.1 IE Bulletin 79-14 3
3.2 Existing Problem 4
4.0 DEFINITIONS 4.1' Satisfactory (SAT) 4 4.2 Minor Discrepancy (MD) 4 4.3 Nonconformance (NC) 4 4.4. Major Discrepancy (MJD) 4 5.0 PROCEDURE 5.1 Part 1 - Walkdown Inspection Document Collection 5
5.2 Part 2 - Walkdown Inspection 5
5.2.a - Office Work 5
5.2.b - Site Work 6
5.3 Part 3 - Reporting of Walkdown Findings 8
5.4 Part 4 - Evaluation of Walkdown Findings 8
6.0 PERSONNEL TRAINING 6.1 Inspection Team 9
t 6.2 -Personnel Training 9
6.3 Responsibilities 10 7.0 ACCEPTANCE CRITERIA 7.1 Generic Tolerances 10 Appendix A - Walkdown Checklist Appendix B - Detailed Scope e
s 9
1.0 PURPOSE This document provides the procedures and guidelines for walkdown inspection and evaluation of piping systems and pipe supports to assure compliance with the IEB 79-14 requirements.
2.0 SCOPE The scope of this document is limited to the balance of 79-14 piping systems. This includes safety related Seismic Class 1 piping systems listed in the Rancho Seco FSAR Appendix SB (2 1/2" diameter and larger and; if they were originally computer analyzed, 2" diameter and smaller) which were omitted from the scope of original IEB 79-14 effort which was completed for Rancho Seco in 1980. The specific lines covered by this procedure are listed in Appendix B of this procedure.
Sufficient number of supports from the non-seismic piping shall be included in the evaluation to predict the impact of non-seismic portion of the system on the seismic portion.
Inspection of concrete expansion bolts and base plates, having been covered by IEB 79-02, is excluded from the scope of this effort.
3.0 BACKGROUND
3.1 IE Bulletin 79-14 IE Bulletin 79-14, Seismic Analysis for As-Built Safety Related Piping Systems was issued July 2, 1979, and Revision 1 to the bulletin was issued July 18, 1979.
This bulletin addresses the concern which was raised when inspection of some operating plants disclosed that installed piping systems were not in conformance with design documents.
The specific concern is that non-conformances between the design document, used as input information to the seismic analysis of the piping system, and the as-built condition could potentially impact the validity of the seismic piping analysis.
In order to assure that the seismic piping analyses are still valid, the bulletin required each operating LWR to inspect specified safety related, Seismic category I systems, and compare the as-built installation with inputs to the seismic analysis. Where significant non-conformances are discovered they must be resolved either by reanalysis or by modifications to the piping system or its supports.
3.2 Existing' Problem A crack was developed on the RCS vent line very close to the OTSG nozzle (E-205B).
This failure was attributed to a deficiency in the as-built piping / support configuration.
Investigations revealed the fact that this line, being originally computer analyzed, should have been included in the IEB 79-14 effort.
SMUD's further review of the systems included in IEB 79-14 effort and comparing those with the scope and intent of the Bulletin identified additional systems which should have been included. These systems will be i
evaluated to assure the adequacy of the as-built configuration.
4.0 DEFINITIONS 4.1 Satisfactory (SAT)
This term is used in the Walkdown Checklist of Appendix A.
" SAT" shall be used to indicate that the configuration meets the requirements of the design documents including design tolerances.
4.2 Minor D'iscrepancy (MD)
' Any discrepancy which does not change the structural behavior of the system, piping and supports, such as unpainted members, nuts fully engaged but no exposed threads, slightly off pin-to-pin dimension, minor corrosion, and brackets added for construction or maintenance, are considered minor discrepancies. During walkdown, the appropriate stress / pipe support engineer shall determine whether any discrepancy is minor or a nonconformance.
For the sake of consistency and to avoid misjudging significant nonconformances as MDs, the walkdown group supervisor shall review all the checklists.
However, the final determination of the classification of the observation is the team leader's responsibility.
4.3 Nonconformance(NC)
Any configuration difference from design documents which is outside the design tolerances and is not a minor discrepancy is categorized as a Nonconformance (NC).
4.4 Major Discrepancy (MJD)
J Any nonconformance (NC), the dispositioning of which requires i
hardware changes to maintain system operability is a Major Discrepancy (MJD).
SMUD, Rancho Seco Technical Specification, defines a component or system to be operable if it is
"... capable of performing its intended function" within the required range.
l l
i
-5.0 PROCEDURE The as-built walkdown inspection consists of four (4) parts:
Part 1 - Walkdown inspection documents collection.
Part 2 - Walkdown inspection.
Part 3 - Reporting of walkdown findings.
a) NCR b) AP22 Part 4 - Evaluation of walkdown findings.
5.1 Part 1 - Walkdown Inspection Documents Collection The following information constitutes a complete inspection package. The first.three items are required for field walkdown, others are to be utilized during evaluation of the nonconformances. These documents shall be obtained from the I
controlled copies.
1.
The latest support drawings with all outstanding DCNs attached.
2.
Piping stress isometrics identifying all critical dimensions and supports.
3.
Piping fabrication drawing.
4.
Appropriate-pages of valve and piping specification list
.(Drawing M-870)..
5.
Line List-(MEL Listing) i 6.
Latest computer input data listing.
7.
Valve drawings with appropriate valve I.D. and Master Valve List (MEL Listing).
8.
Piping stress summary sheet.
I 5.2 Walkdown Inspection
~
Walkdown inspection is to be performed utilizing the Walkdown Checklist shown in Appendix A.
All applicable areas of this checklist shall be addressed by the walkdown team.
Some of the sections of this list shall be filled out in the office by I
the walkdown-team before the physical field inspection.
The following sections describe the work to be performed in the office as compared to the work to be performed during the walkdown.
5.2.a Office Work This phase of the inspection shall be done before l
the actual walkdown.
In this phase, the following l
items from the Walkdown Checklist shall be addressed:
g
- 1) Item A.1, Pipe Material / Size: This information is available in the Valve and Piping Specification List (Drawing M-870).
I i
5.2.a.2) f tems A.2 through A.4, Pipe Temperature, Pressure and Content: Obtain this information from the Line List (MEL Listing)
- 3) Item A.6, Location & Elevation of the Piping System: Use the stress Iso to identify the system location.
This inform.stion will be used in verifying the applicable response spectra by the dispositioning team.
- 4) Valve Data: To obtain valve data, the following steps may be followed:
1.
Identify the.line number from the stress Iso. With reference to the Class 1 Line y
List identify the P&ID which indicates the system and locate the line under consideration.
4 2.
Locate the valve of interest on P&ID and note the number.
3.
Refer to MEL Listing, locate the valve number and record all the pertinent 4
information.
This information shall be compared against the field collected information.
- 5) Comparison of Stress Iso and Fab. Iso.: This task (which is not on W.D. Checklist) shall be addressed after completion of the physical walkdown.
5.2.b Site Work - All other items on the checklist including item A.5, to be checked by the team as they walk the line down.
For insulation inspection, the circumference of the insulated pipe shall be 1
measured.
The insulation type shall also be checked in the field.
If this cannot be easily identified, a specialized insulation person should be called in to' determine the type.
I Page 1 of 4 of the Walkdown Checklist (Piping Data j
Sheet) shall be filled out for each line (i.e., one sheet per line), and Pages 2, 3, and 4 shall be filled out for each support, valve, and penetration / interference on the above line (i.e.,
one sheet per support). 1
5.2.b The walhdown team shall use the stress isometric to highlight the piping geometry with a blue marker as they walk the line down.
If discrepancies exist, the as-built dimension shall be written with red pen on the stress isometric.
Upon completion of the walkdown, this drawing shall be stamped AS-BUILT, signed BY & CHECKED and dated.
For support sketches, this procedure shall be done visually.
Visual As-Built" shall be noted on the. drawing and the drawing shall be i
signed BY_and CHECKED.
In the event that an obvious nonconformance is detected, the as-built drawing should be prepared to aid the dispositioning team.
It is intended that all measurements on piping be made using a measuring device such as a tape, a ruler, etc.
For pipe support components, welds, and inaccessible piping, a visual estimate of dimension may be performed.
However, when visual estimates are used, the accuracy of estimation a
must be within specified tolerances.
If visual inspection of a support or weld reveal obvious
~
non-conformances, physical measurement of critical dimensions is necessary. When visual dimensional checks are used, the documentation should reflect this fact.
I While inspecting each item on the Walkdown i
Checklist, the following possibilities may be encountered:
1 The inspected item, as-built, is in full compliance with the design documents. This
. item shall be marked as Satisfactory (SAT).
The inspected item, as-built, is deviating from the design documents.
In this case, the walkdown team leader is to make on-the-spot l
engineering judgement to determine whether the deviation has a significant impact on the structural behavior of the piping system overall.
If the conclusion to this quick assessment is negative, the item shall be marked as Minor Discrepancy (MD), otherwise, it will be classified as a Nonconformance (NC).
The walkdown group supervisor shall review the 1
team leader's judgements for reasonableness.
The team (leader) should make sure that the MD or NC is fully explained (attach additional sheets if necessary) so that disposition could be performed without a need for reinspection.
i For all NCs (and MDs if applicable) an as-built sketch should be prepared, stamped AS-BUILT, and signed BY & CHECKED.
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5.3 Part 3 - Reporting of Walkdown Findings Each walkdown team (leader) is responsible to report all the findings to the walkdown group supervisor.
The walkdown team (leader) shall provide a completed checklist, with all the necessary signatures on the checklist and the as-built drawings, provide a summary of the nenconformances and the overall status of his team's achievements to the walkdown group supervisor daily.
y Each item on the Walkdown Checklist (Appendix A) should be addressed by the walkdown engineer as Satisfactory (SAT),
Minor Discrepancy (MD), Nonconformance (NC), or Not Applicable (N/A). All NCs and MDs shall be explained in the remark column.
If necessary, pages of remarks to sufficiently describe the nature of the nonconformity for effective evaluation of the deficiency by engineering, or of the minor deviation for corrective maintenance, shall be added to the checklist.
The remarks should be enhanced by the use of sketches, comments, drawings, mark-ups, photographs, etc.
1 If any component or component support is discovered in a condition that could seriously affect its operability, it shall be immediately reported to the dispositioning team so that it is addressed per AP22.
The nonconformance shall be identified on the walkdown drawings.
The resolution of the discrepancy shall be included in the evaluation package.
5.4 Part 4 - Evaluation of Walkdown Findings In reviewing the Walkdown Checklist for each line, the dispositioning engineer may encounter the following possibilities:
5.4.1 All items on the Walkdown Checklist are " SAT" (this include:: all supports and the piping). The line, as-built, is in full compliance with the design documents and the intent of the IEB 79-14 is met.
The calculation file should be marked as such and no further action is required for this line.
1 5.4.2 Any MD requiring physical correction (per the judgement of the dispositioning team) shall be reported in a Work Request (WR) form to Construction
& Maintenance for their corrective action immediately. Necessary documents and design drawings for the applicable MDs shall be updated to reflect the as-built condition by Engineering per SMUD QA procedures.
5.4.3 One (or more) of the as-built items is in nonconformance (NC) with the design documents, i.e.,
the discrepancy falls outside the allowed tolerances. All NCs shall be written in a Nonconformance Report (NCR).
It is recommended that NCRs be prepared for each system upon its completion. Engineering evaluation of the NCR, which should be completed in two days, may reveal one of the following results:
_s.
_ - ~.
5.4.3a) Acceptable stress levels and design configuration; in this case, the analytical engineering evaluation should be completed in 30 days and Engineering should update the necessary design drawings and calculations to reflect the
- as-built condition per SMUD QA procedures.
In this phase, no physical hardware change is involved.
b)
Initial evaluation of the nonconformance is not very definitive.
In this case, a more refined computer
-analysis and design should be performed within 2 days to show compliance of as-built with the design criteria without the need for hardware modification.
If this is not attainable, the item (s) responsible for the failure should be identified as a Major Discrepancy (MJD) -
on the remark column of Walkdown Checklist and the nonconformance reported per AP22.
In this case, the
-operability of the system should be confirmed.
If the system cannot be positively shown operable with the analytical evaluation, this should be imediately brought up to the attention of the Shift Supervisor and the
?
Principal Project Engineer for determination of appropriate action.
SMUD, Rancho Seco Technical Specification defines a component or system to be operable n
if it is ".... capable of performing its intended function" within tne required range.
Flow chart in Figure 1 shows the sequence of activities for this project.
For analysis and design,-Bechtel Pipe Stress and Support Design Criteria, Revision 0, shall be used.
1 The evaluation package should have all the applicable NCR numbers, stress calculations, design packages addressed on the cover sheet for cross-reference. A box should be assigned for completion of all work.
When this box is initialed by the dispositioning team leader, the work on this specific system is considered complete.
6.0 PERSONNEL AND TRAINING I
6.1 Inspection Team The inspection team shall consist of one stress / support engineer and one additional engineering person to assist in taking measurements.
6.2 -Personnel Training All the personnel working on tasks within the scope of this instruction shall be trained on the instructions herein related to their specific activity and the overall purpose and goal of this project.
This training shall be documented. The personnel involved in the walkdown have been selected based on their knowledge and experience in the area of piping and supports.
The resumes of their qualifications will be placed in record.
l i
l 6.3 Responsibilities The pipe support / stress engineer shall be the leader of the inspection team. He shall assure total compliance of the inspection to this procedure.
7.0 ACCEPTANCE CRITERIA
'The walkdown team shall perform their inspection based on the design tolerances given on the design documents. Any item within the above tolerances should be checked as " SAT" on the Walkdown Checklist. Any item which is not a minor discrepancy and falls outside the tolerances authorized by design documents is a Nonconformance (NC) for which a Nonconformance Report (NCR) should be issued.
Non-NF fillet weld inspection will be in accordance with AWS D1.1-80 paragraph 8.15.1.7 (in case that further inspection is required).
7.1 Generic Tolerances The following generic tolerances shall be used in conjunction with the design documents for this inspection:
a)
Support Location:
Forpipesizespf,4": 1 6" g
Forpipesizescp>4": 2Df,24" Where D = nominal pipe diameter b)
Straight Pipe Span:
Tolerance = 12 X D c)
Concentrated load span: Tolerance = 1 1 X D Also, for the span adjacent to equipments.
d)
Pipe run between two changes in direction:
Tolerance = 1 5% of designed length, e)
Angular tolerance for bends:
Tolerance = 1 150 (visual) f)
Valve location:
tolerance = 1 5% of span g)
Eccentic Operator Orientations:
Tolerance = 1 100 (visual) h)
Gaps: Max, size = 1/8" (both sides added) unless otherwise specified by design 1)
Support Orientation: Tolerance = 1 50 (visual) i e._
Figura 1
{
BALANCE OF IE SULLETIN 79-14 EFFORT FOR d"I' RANCHO SECO NUCLEAR' GENERATING STATION FLOW CHART t
i PREPARE W.D.
PACKAGE
<r PERFORM W.D. USillG STRESS ISO & SUPPORT SKETCHES 9
RECORD AS-5UILT li STRESS ISO / SUPPORT SKETCHES REVISE FAB.
_wer COMPARE AS-3UILT ISO
~ on vs. FAB ISO e
=
ou COMPARE AS-3UIL-T, ex j
sys. COMPUTER INPUI>
OR PPORT SKETCH
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uor SUPPORT EVALUATI0fD g,
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CONTINUED PLANT WRITE OPERTATION AP-22 V
ir UPDATE DESIGil MODIF/ SUPPORT DRAWINGS AND CONFIGURATION CALCULATIONS CK THE INTENT OF IE BULLETIN 79-14 SATISFIE3
Page 1 of 4 Pipino Data APPENDIX "A" WALKDOWN CHECKLIST CALC. NO.:
INSPECTED BY:
DATE:
~~
-- LINE I.D.#:
CKD BY (LEAD ENGR):
DATE:
BLDG. LOCATION / SYSTEM:
NUMBER OF PAGES ATTACHED:
Check the compliance of the following "As-Built" items from the piping system with the "As-Designed", i.e., walkdown vs. design documents.
7, IIEM 5Al MU NC N/A MtMAMK NU.
A.
GENERAL PIPING INFORMATION:
1.
Material / size
- 2. -
Temperature 3.
Pressure 4.
Content 5.
Insulation a.
Thickness b.
Material 6.
Location a.
Building b.
Elevation B.
SPECIFIC PIPING INFORMATION:
1.
Pipe Routing a.
Elbow / Bend Angle b.
Elbow / Bend Type c.
Dimensions 2.
Branch Connections a.
Location b.
Type 3.
Penetration / Interferences (see attached sheet) a.
Location 4.
Other Concentrated Weights (i.e. flan couplings)ges and intermediate a.
Location b.
Eccentricity / Orientation 5.
Other Observations (Explain) a.
b.
c.
1 i
Page 2 of'4
~
Support Data APPENDIX "A" WALKDOWN CHECXLIST (CONTINUED)
SUPPORT NO./ REY.:
INSPECTED BY:
DATE:
-SYSTEM:
CKD. BY(LEAD ENGR):
DATE:
i BLDG. LOCATION:
0THER DESIGN DOCUMENTS REVIEWED /REV.:
Check the compliance of the following "As-Built" items with the "As-Designed",
i.e., Walkdown vs. Design Documents:
N/A REMARK NO.
i C.
GENERAL SUPPORT INFORMATION:
1.
Location 2.
Type i
3.
Orientation 4.
Gap / Clearance i
D.
SPECIFIC SUPPORT INFORMATION:
j t
1.
Structural Members a.
Type l
b.
Size (visual) l 2.
Welds (as-painted) a.
Configuration l
b.
Size / Length (visual) l 3.
Base Plates a.
Plate Size b.
Anchor Bolt Size.
Spacing c.
Bolt Edge Distances i
l 4.
Bolts / Clamps / Rods a.
Size b.
Installation l
1 l
S.
Springs & Snubbers a.
Cold Setting b.
Size L
6.
Snubbers & Struts a.
Pin-to-Pin Distance 7.
Thermal Offset if Shown on Pipe Drawings 8.
Pipe Attachment a.
Type l
b.
Size j
9.
Other Observations (explain) l
Page 3 of 4 APPENDIX "A" WALKDOWN CHECKLIST VALVE DATA Fill out one checklist per valve By:
Date:
1 Check:
Date:
System:
i Line No.:
t Drawing No.:
Valve Mark No.:
t Vendor:
SAT NC N/A r
1.
Valve Type 2.
I.D. Mark No.
3.
Extended Operator a.
Orientation
.b.
Type 4.
Operator I.D.
5.
Pressure Rating l
l l
l l
I l
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Page 4 of 4 APPENDIX "A" WALKDOWN CHECKLIST FLOOR AND WALL PENETRATION INTERFERENCES DATA Fill out one checklist per penetration r
BY:
DATE:
CHECK:
DATE:
System:
Line No.:
Drawing:
Penetration I.D.':
Is the pipe " fixed" at the penetration?
1.
If yes, indicate type, a.
Structural Restraint:
(Indicate direction below) b.
Grouting:
c.
Sealing:
2.
If no, indicate clearances below (accurate to 1/2"):
Is pipe Hot Cold
?
N Up W
l E
/
S Down Looking Downward Looking (Specify) r 005MK
1 APPENDIX B DETAILED SCOPE OF WORK 1
The following pages define the scope of this effort by lines.
This list is preliminary and it is being updated periodically as the project progress.
The final detailed scope of the work will be issued upon completion of the work in a later revision to this procedure for the sake of documentation traceability and completeness.
Mf/
APPE'iDIX B L
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