ML17194B501
| ML17194B501 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/10/1983 |
| From: | James Gavula, Horley E, James Smith NUTECH ENGINEERS, INC. |
| To: | |
| Shared Package | |
| ML17194B502 | List: |
| References | |
| COM-52-003, COM-52-3, NUDOCS 8303290567 | |
| Download: ML17194B501 (11) | |
Text
COM-52-003 Revision 4 March 10, 1983 DRESDEN NUCLEAR GENERATING STATION UNIT 2 Approved by:
Q80~ *~o~e7 a~o31a PDR ~DOCK 05000237 p
PDR REPAIR PROGRAM FOR RECIRCULATION RISERS Prepared for Commonwealth Edison Company Prepared by:
NUTECH Engineers, Inc.
Chicago, Illinois Issued by:
tfoject M nager Date:
. March 10, 1983 nutech ENOINEERS
REVISION CONTROL SHEET
Title:
Dresden Nuclear Generating Station Unit.2 Repair Program for Recirculation Risers J. F. SMITH PROJECT ENGINEER NAME/TITLE E. C. EORLEY PROJECT MANAGER NAME/TITLE EFFECTIVE PAGE(S)
INITIAL
- INITIAL REVISION J. J. GAVULA ENGINEERING MANAGER NAME/TITLE ACCURACY PREPARED CHECK
-d¥ INITIAL CRITERIA CHECK l
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AO Al A2 A3a A3b COM-52-003 Revision 4 4
4 4
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TABLE OF CONTENTS A.
DESCRIPTION B.
ORIGINAL CODE OF CONSTRUCTION
- c.
CODE OF REPAIR D.
FLAW DESCRIPTION AND FAILURE MODE EVALUATION E.
REPAIR REQUIREMENTS F.
QUALITY ASSURANCE REQUIREMENTS G.
DOCUMENTATION AP?E~DICES Flaw Location and Description Type 1 Weld Overlay Configuration Type 2 Weld Overlay Configuration CG~-:)2-003 Revision 4 iii.
Paae 1
1 1
1 2
3 3
A.0 A. l A.3a A. 3b nutech EN QIN EE AS
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REPAIR PROGRAM A.
DESCRIPTION This program addresses the repair of flaws in elbow joints in several of* the 12" recirculation risers.
The repairs will consist of welded overlays as shown in Appendix A.2.
Overlays will *extend beyo"nd. the. extremities of axial flaws and will provide improved residual stress conditions on the inside of the piping as well as reinforcing the joint area.
B.
ORIGINAL CODE OF CONSTRUCTION The recirculation system piping outboard of the safe end to pipe weld was designed and constructed in accordance with ASME Code Section I, 1965 Edition with Addenda through Winter 1966.
The original Design Specification, K-2202 by Sargent &
Lundy, contained additional requirements.
C.
CODE OF REPAIR
- 1.
The repairs will meet the requirements of the ASME Code,Section XI, 1974 Edition with Andenda through Summer 1975.
In addition, guidance will he taken from the 1980 Edition of Section XI with Addenda through Winter 1981.
- 2.
As allowed by ASME Section XI, repairs shall be performed in accordance with the original Code of Construction and Design Specification referenced in Section B, except as modified in Section E, Repair Requirements.
D.
FLAW DESCRIPTION AND FAILURE MODE EVALUATION
- 1.
The flaws are circumferential and axial intergranular stress corrosion cracks (IGSCC) l.ocated in the elbaw to pipe welds in the 12" Recirculation Riser lines.
A complete tabulation of flaw locations and descriptions is given in Appendix A*. l.
- 2.
The flaws were revealed* by ultrasonic examination.
- 3.
In order to inhibit the flaw growth, weld overlays will be made over the affected weld joints.
A weld overlay will induce a compressive residual stress field in the flawed region, thereby inhibiting the progress of IGSCC.
l COM-52-003 Revision 4 nutech ENOINEEA8
E.
REPAIR REQUIREMENTS
- 1.
Existing Material
- a.
P~ping:
ASTM A358 Gr. 304
- b.
Fittings:
ASTM A403 Gr. WP304 or ASTM A336 CL.F8
- c.
Weld. filler metal:
unknown
- 2.
New Material
- a.
Weld filler metal:
Type 308L stainless steel
- 3.
Design
- a.
Design of the weld overlay shall assure that the original design parameters are met using the Net Section Collapse methodology of proposed Section XI Article IWB-3640.
b..
Physical dimensions of the weld overlay are given in Appendix A.2.
The Type 1 weld overlay configuration will be used for all flaws identified in this program.
The Type 2 weld overlay is for reference only, and may be used only as directed by SNED.
- 4.
Fabrication
- a.
All welding shall be *performed in accordance with welding procedure specifications qualified in accordance with ASME Section IX.
- b.
All welders shall be qualified "in accordance with ASME Section IX.
- c.
The repair is exempt from postweld heat treatment.
- d.
Benchmarks shall be installed on the pipe to facilitate measurement of shrinkage induced by weld overlays.
Measurements across the overlay area will be recorded before and after welding to detect any change in axial length.
S.
Examination
- a.
Each overlay shall be examined by the liqu{d penetrant (PT) method in accordance with the latest revision of Commonwealth Edison Procedure COM-5.2-003 Revision 4 NDT-D-2.
PT shall be extended to include base 2
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- e metal within one inch of each end of the overlay.
Al~ findings shall be reported for resolution.
- b.
An-ultrasonic *examination shall be performed in accordance with Commonwealth Edison Special Process P.rocedures to establish the soundness of the weld overlay and its fusion to the base metal.
All findings shall be reported for resolution.
- c.
An ultrasonic examination shall be performed to provide a new baseline for Inservice Inspection.
Ultrasonic examination _shall be performed in accordance with the latest revision of Commonwealth Edison Procedures NDT-C-2.
- 6.
Testing A hydrostatic pressure test is being performed as part of the normal inservice inspection program in accordance with Article IWA-5000 of ASME Section XI.
The test may be performed prior to completion of all oveilays.
- 7.
Code Stamp.ing Code stamping of the repair is not required and shall not be performed.
F.
QUALI~Y ASSURANCE REQUIREMENTS All work shall be performed in accordance with Commonweal t.h Edison's Quality Assurance Program.
G.
DOCUMENTATION
- 1.
The repairs will be documented on Form NIS-2 "OWners Report of Repair or Replacement," or equivalent form as specified by the O,,..ner's Authorized Inspection Agency.
- 2.
The the
- 1.
- 2.
- 3.
following records *will be permanently maintained at Dresden Nuclear Generating Station:
- Certified material test reports (CMTRs) for the filler material.
Welding procedure specifications and qualification records.
Records of welder and welding operator qualifications.
- 4.
Nondestructive examination procedures and personnel qualifications.
COM-52-003 Revision 4 3
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Nondestructive examination reports.
- 6.
As-built drawings or sketches of the UT calibration block.
- 7.
Section XI repair program (this document).
- 8.
Cer~ified design report for repair.
- 9.
As-built drawings or sketches.
- 10.
System pressure test records.
COM-52-003 Revision 4 4
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COM-52-003 Revision 4 APPENDICES A.0
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FLAW LOCATION AND DESCRIPTION
- 0 ()
(1) 0
<: 3:
t-'* I Recirculation Radial en U1 1-'*N Riser Line #
Overlay Location 0
I.
- J 0 and Nozzle Weld #
Type (o'clock)
Orientation Description 0
- " w 2-02018-12" PD4-D23 1
11:30 Axial 1/2" x 27% wall - elbow side Nozzle 2A (Bottom) 9:00 Axial 3/8" x 14% wall -
elbow side 1:30 Axial 5/8" x 26% wall - pipe & elbow 6:00 Circumfer-1/2" x 19% wall - pipe s i<:le ential 1:00 Circumfer-7/16" x 13% wall - pipe side e ential 2-0201M-12" PD19-Dl3 1
6:00 Axial 3/4" x 19% wall - elbow side Nozzle 2E (Top) 11:00 Axial 1-1/8" x 10% wall pipe side PD19-Dl4 l
4:00 Circumfer-1-1/2" x 24% wall..., elbow side
~
(Bottom) ential I-'
2-0201C-12" PD7-Dl,l l
6:30 Circumfer-1-1/2" x 14% wall - elbow side Nozzle 2F (Top) ential 8:30 Axial 9/16" x 16% wall - pipe, side 2-0201E-12" PD9-D8 2
6:00 Circumfer-3/4" x 30% wall - pipe side Nozzle 2H (Bottom) ential 2-0201F-12" PD2-D4 l
7:00 Axial l" x 27% wall - elbow side Nozzle 2J (Top) 10:30 Axial 1/2" x 19% wall - pipe side 2-0201G-12" PD3-D2 i
1:00 Axial 1/4" x 23% wall - pipe side Nozzle 2K (Bottom) 4: 30 Axial 1/4" x 14% wall - pipe side 10:00 Axial 3/16" x 21% wall - pipe side 10:30 Axial 1/4" x 14% wall - pipe side
- 0 ()
<1> 0
< 3:
t-'* I Ill U1 t-'* "->
- O I
- J 0 a
""'w I
- l>'.
AS WELDED SURFACE ACCEPTABLE FOR TAPER TRANSITIONS TYPE 304
.as" TO 1.2 5" (REF)
TYPE 1 WELD OVERLAY CONFIGURATION FOR THE RECIRCULATION INLET
. /TYPE 306L OVERLAY
/
- _ 0.20" MIN, TYPE 304 ELBOW
- o n Cl> 0
<: 3:
I-'* I Ul VI 1-'*N 0
I
- J 0 0
,i:.W
- I
- I>'.
0.15
c 0.75 TYPE 308L OVERLAY MIN.
0.12 MIN 0.58 (REF)
Notes:
- 1. C = Width. of Weld Face
- 2. This overlay configuration is for reference, only.
This design may be used only as directed by SNED.
TYPE 2 WELD OVERLAY CONFIGURATION FOR THE RECIRCULATION INLET