BYRON 2006-0119, Pressurizer Weld Overlay Examination Results Related to Relief Request I3R-08
ML063000478 | |
Person / Time | |
---|---|
Site: | Byron ![]() |
Issue date: | 10/26/2006 |
From: | Hoots D Exelon Generation Co, Exelon Nuclear |
To: | Document Control Desk, Office of Nuclear Reactor Regulation |
References | |
BYRON 2006-0119 | |
Download: ML063000478 (11) | |
Text
Exel n~
October 26, 2006 LTR:
BYRON 2006-0119 File:
1.10.0101 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 1 Facility Operating License No. NPF-37 NRC Docket No. 50-454
Subject:
Pressurizer Weld Overlay Examination Results Related to Byron Staticn Relief Request l3R-08
References:
(1)
Letter from D M. Hoots (Exelon Generation Company, LLC) to U. S.
NRC, ~
3 1d 10-Year Inservice Inspection Interval, Rehef Request I3R-08, Preventive Weld Overlays on Pressurizer Spray, Relief, Safety and Surge Nozzles and Associated Alternative Repair Techniques, dated April 28, 2006 (2)
Letter from D. M. Hoots (Exelon Generation Company, LLC) to U. S.
NRC, Response to NRC Request for Additional Information to Byron Station Relief Request 13R-08, dated August 18, 2006 (3)
Letter from K. R. Jury (Exelon Generation Company, LLC) to U. S. NRC, Commitment Regarding Byron Station Relief Request l3R-08, dated September 14, 2006 The Reference 1 submittal proposed an alternative (i.e., Relief Request 13R-08), in accordance with 10 CFR 50.55a(a)(3)(i), to the repair/replacement requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section Xi, 2001 Edition, through 2003 Addenda, IWA-4000, for the structural weld overlays on the Byron Station pressurizer spray, relief, safety and surge nozzle safe-ends.
The Reference 2 submittal provided additional information in support of the proposed alternative.
In a September 14, 2006, teleconference between representatives of the NRC and Exelon Generation Company, LLC (EGC), the NRC requested that EGC provide a commitment to provide the details of the ultrasonic examination results of the structural weld overlays on the Byron Station Unit 1 pressurizer spray, relief, safety and surge nozzle safe-ends to the NRC within 14 days of the completion of the final ultrasonic examination.
October 26, 2006 U.S. Nuclear Regulatory Commission Page 2 This commitment was provided in the Reference 3 submittal.
After receipt of the Reference 3 submittal, the NRC granted verbal approval of Relief Request l3R-08 for Byron Station Unit 1.
In accordance with the Reference 3 commitment, EGC is providing the details of the ultrasonic examination (UT) results of the structural weld overlays on the Byron Station Unit 1 pressurizer spray, relief, safety and surge nozzles. The final weld overlay UT conducted during the Bi R14 outage was completed on October 13, 2006.
Table 1, Indications for B1R14 Pressurizer Weld Overlays (Pre-Weld Repairs), provides detailed results of the initial UT inspections performed on the aforementioned pressurizer nozzles. The following is a summary of the results:
Nozzle Number of Flaw Indications Flaw Indication Assessment Summary Safety A 2 Planar Indications One planarindication was unacceptable. Both planar indications were removed in the repair excavation (See Attachment 1).
Safety B No Recordable Indications Safety C 9 Laminar Indications and 7 Planar Indications Four (4) laminar indications were unacceptable due to associated assumed flaws. Two (2) assumed flaws associated with laminar indications were found to be acceptable per IWB-3640. Six (6) laminar indications were removed in the repair excavation (See, page 1). All seven (7) planar indications were unacceptable and were removed in the repair excavation (See, page 2).
PORV 3 Laminar Indications and 3 Planar Indications All three (3) laminarindications were acceptable. Two (2) Planar indications were unacceptable and were removed in the repair excavation (See Attachment 3).
SPRAY No Recordable Indications SURGE 7 Laminar Indications All seven (7) laminar indications were acceptable.
As indicated above, the Safety A, Safety C and PORV Nozzles had flaw indications that were determined to be unacceptable. Weld material excavation and repairs of these nozzles were performed (See Attachments 1, 2, and 3 for repair excavation areas and encompassed flaw indications). Table 2, Indications for 81 R14 Pressurizer Weld Overlays (Post-Weld Repairs),
provides detailed results of the final UT inspections performed on the Safety A, Safety C and PORV Nozzles following weld repairs. The following is a summary of the results:
Nozzle Number of Flaw Indications Flaw Indication Assessment Summary Safety A 1 Laminar Indication and 1 Planar Indication All indications were found to be acceptable.
Safety C No Recordable Indications PORV No Recordable Indications
October 26, 2006 U.S. Nuclear Regulatory Commission Page 3 Should you have any questions concerning this letter, please contact William Grundmann at (815) 406-2800.
Respectfully, David M. Hoots Site Vice President Byron Station DMH/JEL/rah Attachments: Table 1 Indications for Bi Ri 4 Pressurizer Weld Overlays (Pre-Weld Repairs), 3 pages.
Table 2
- Indications for Bi R14 Pressurizer Weld Overlays (Post-Weld Repairs),
1 page.
Safety A Nozzle Weld Repair Area, 1 page.
- Safety C Nozzle Weld Repair Area, 2 pages. - PORV Nozzle Weld Repair Area, 1 page.
Exel n~
October 26, 2006 LTR:
BYRON 2006-0119 File:
1.10.0101 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 1 Facility Operating License No. NPF-37 NRC Docket No. 50-454
Subject:
Pressurizer Weld Overlay Examination Results Related to Byron Staticn Relief Request l3R-08
References:
(1)
Letter from D M. Hoots (Exelon Generation Company, LLC) to U. S.
NRC, ~
3 1d 10-Year Inservice Inspection Interval, Rehef Request I3R-08, Preventive Weld Overlays on Pressurizer Spray, Relief, Safety and Surge Nozzles and Associated Alternative Repair Techniques, dated April 28, 2006 (2)
Letter from D. M. Hoots (Exelon Generation Company, LLC) to U. S.
NRC, Response to NRC Request for Additional Information to Byron Station Relief Request 13R-08, dated August 18, 2006 (3)
Letter from K. R. Jury (Exelon Generation Company, LLC) to U. S. NRC, Commitment Regarding Byron Station Relief Request l3R-08, dated September 14, 2006 The Reference 1 submittal proposed an alternative (i.e., Relief Request 13R-08), in accordance with 10 CFR 50.55a(a)(3)(i), to the repair/replacement requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section Xi, 2001 Edition, through 2003 Addenda, IWA-4000, for the structural weld overlays on the Byron Station pressurizer spray, relief, safety and surge nozzle safe-ends.
The Reference 2 submittal provided additional information in support of the proposed alternative.
In a September 14, 2006, teleconference between representatives of the NRC and Exelon Generation Company, LLC (EGC), the NRC requested that EGC provide a commitment to provide the details of the ultrasonic examination results of the structural weld overlays on the Byron Station Unit 1 pressurizer spray, relief, safety and surge nozzle safe-ends to the NRC within 14 days of the completion of the final ultrasonic examination.
October 26, 2006 U.S. Nuclear Regulatory Commission Page 2 This commitment was provided in the Reference 3 submittal.
After receipt of the Reference 3 submittal, the NRC granted verbal approval of Relief Request l3R-08 for Byron Station Unit 1.
In accordance with the Reference 3 commitment, EGC is providing the details of the ultrasonic examination (UT) results of the structural weld overlays on the Byron Station Unit 1 pressurizer spray, relief, safety and surge nozzles. The final weld overlay UT conducted during the Bi R14 outage was completed on October 13, 2006.
Table 1, Indications for B1R14 Pressurizer Weld Overlays (Pre-Weld Repairs), provides detailed results of the initial UT inspections performed on the aforementioned pressurizer nozzles. The following is a summary of the results:
Nozzle Number of Flaw Indications Flaw Indication Assessment Summary Safety A 2 Planar Indications One planarindication was unacceptable. Both planar indications were removed in the repair excavation (See Attachment 1).
Safety B No Recordable Indications Safety C 9 Laminar Indications and 7 Planar Indications Four (4) laminar indications were unacceptable due to associated assumed flaws. Two (2) assumed flaws associated with laminar indications were found to be acceptable per IWB-3640. Six (6) laminar indications were removed in the repair excavation (See, page 1). All seven (7) planar indications were unacceptable and were removed in the repair excavation (See, page 2).
PORV 3 Laminar Indications and 3 Planar Indications All three (3) laminarindications were acceptable. Two (2) Planar indications were unacceptable and were removed in the repair excavation (See Attachment 3).
SPRAY No Recordable Indications SURGE 7 Laminar Indications All seven (7) laminar indications were acceptable.
As indicated above, the Safety A, Safety C and PORV Nozzles had flaw indications that were determined to be unacceptable. Weld material excavation and repairs of these nozzles were performed (See Attachments 1, 2, and 3 for repair excavation areas and encompassed flaw indications). Table 2, Indications for 81 R14 Pressurizer Weld Overlays (Post-Weld Repairs),
provides detailed results of the final UT inspections performed on the Safety A, Safety C and PORV Nozzles following weld repairs. The following is a summary of the results:
Nozzle Number of Flaw Indications Flaw Indication Assessment Summary Safety A 1 Laminar Indication and 1 Planar Indication All indications were found to be acceptable.
Safety C No Recordable Indications PORV No Recordable Indications
October 26, 2006 U.S. Nuclear Regulatory Commission Page 3 Should you have any questions concerning this letter, please contact William Grundmann at (815) 406-2800.
Respectfully, David M. Hoots Site Vice President Byron Station DMH/JEL/rah Attachments: Table 1 Indications for Bi Ri 4 Pressurizer Weld Overlays (Pre-Weld Repairs), 3 pages.
Table 2
- Indications for Bi R14 Pressurizer Weld Overlays (Post-Weld Repairs),
1 page.
Safety A Nozzle Weld Repair Area, 1 page.
- Safety C Nozzle Weld Repair Area, 2 pages. - PORV Nozzle Weld Repair Area, 1 page.
Indications for BiR14 Pressurizer Weld Overlays (Pre-Weld Repairs)
INDICATION DISPOSITION
~10% Reduction In UT MEASURED coverage Flaw Propagation in WB-3640 Eva. tor FLAW INDICATION WIDT outer 25% of underlying INCLUDED IN
~abIe IWB-3514-~Inservice assumedflaw REMARKS LAMINAR FLAW IWB-3514-3 Per Appendix 0 Examination for IWB-3514-2 Preservice weld/ base metal REPAIR IND.
(Square riches)
Q-4100(c)(2) assumed flaws Examination Per Appendix 0 EXCAVATION AREA PerAppendix 0 0-41 OO(c)(3)
(Note 5) 1 N /~
NA AcceptabJe Acce~~ab 0
Accoplabe No I~ca~ors lound
~
~
~
~
~~
Flepii Needed, See Attachment 1 No I ar-ncr Faws DM Weld No Ucicspectai~le~o~urnes M!n rnal (non-rneas~raD01 outer 25° C~,c 0 O°~
Max
& No ooskla1ed radial through wall d rrer.s or NA YES Axal 1 84°5Max I aws N A N A
~
We;o No NC Acce~ab~o
~
~
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Repw Neenea Sco Attachr~nt1 No La~inarFaws No Urirspec~ablevo~rne° 207%ACtual vs.
a No postslated radial 8.8% Allowable.
N A YES f~aws No NA N A NA N A No mo ca~osfo~nd r
~ A N A li~c~ilors o~~er 25°i~
Acceptaoe Accepla~ie Accepab e N A No lrdicat ocx ojd
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Rejai~Nir~e,,Soc Atscqrnert 2.
1 0 ° P 5 a ow DM Weld Pie i~~nira I,,w r.o~ca~iori I amir°arFl~..
ojlo, 25~
R~psr Arc~S 2 C rc.. 2 73% FA~sx is al Ire over wy base Ax al 7 Y5°cMax metal r1elace, lere1o~e.
N A YES 55 Weld te~os cc, xr~rcaectawe Circ U 2O~,Max vo imo Axi,1 I 1 1°~Max Acc~p1abic
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NA
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Unacceptable:
Axial: 20.3 Act vs. 12.5 IA 1
1,
,.n Ca.
38 A,.t 10 /
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. i ~
Ai:owable Unacceptable; YES Axial: 34.4 Act vs. 10.9 Allowable 0.
.3 5.0
~C R3Ac1 I
I Alo: a ~
Unacceptable:
Axial: 15.3 Act. vs 123 Allo~jahte Circ :20.0 Act. vs 11.7
.. i V.
Allowable
V Unacceptable:
V Axial: 27.8 Act. vs. 123 Allowable
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Cic 61)/nO n.~ 13
a
Unacceptable:
YES Axial: 14.9 Act. vs 12 5 Allowable
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Ay.rc Unacceptsbte YES Axial. 27.J Act. vs 12.5 Allowable 9311
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lie INDICATION NOZZLE ID NUMBER INDICATION TYPE UT MEASURED DEPTH FROM OUTSIDE SURFACE TO CENTER OF FLAW IND.
UT MEASURED LENGTH OF FLAW INDICATION MEASURED ON 00 UT MEASURED POSITION OF FLAW INDICATION FROM REFERENCE MARK (As Marked on Sketches)
UT MEASURED CIRCUMF.
POSITION OF FLAW INDICATION IN INCHES FROM 0 REFERENCE POINT (Note 2)
UT MEASURED HEIGHT OF FLAW IND.
AVERAGE THICKNESS OF OVERLAY IN LOCATION OF FLAW INDICATION (Note 4)
Table 1 Page 1 of 4 SAFETYA 1
Planar
~.-
0.2 175 65
-30 No Measurable Depth 67 2
Planar 0.50 4.0 5.0 20 0.31 0.70 SAFETY B No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications 1
2 3
4 5
Laminar Laminar Laminar Laminar Laminar 0.79 0.24- 0.33 0 275- 0.285 0.20 0.23 4.85 2.50 5.4 1.20 2.5 4.2 4,8 7.1 3.3 11.5 0
7.9 74 13.0 12.4 0
0 0
0 0
0.81 0.86° 0.93 0.72 0.48 0.28 0.30 0.25 025 0 50 SAFETY C 6
Laminar 0.15 0.90 8 85
-790 0
0.69 0.20 7
Laminar 0.18, 0.90, 7.3
-110 0
0.97 0.40 3
Laminar 0.39 2 25 7.0
-6.7 0
0.87 9
Laminar 0 38 0.9 47 7 2 0
0.80
Table 1 Page 2 of 4 Indications for B1R14 PressurIzer Weld Overlays (Pre-Weld Repairs)
INDICATION DISPOSITION
<10% Reduction In Coverage Flaw Propagation in IWB-3640 Eval. for FLAW INDICATION outer 25% of underlying INCL DED IN Table IWB 3514-2 Inservice V
assumed flaw IWB.J514-2 Preservice weld! base metal IWB-3514-3 Per Appendix 0 ExaminatiOn for (Square Inches) 0 4100(c)(2) assumed flaws Examination PerAppendix 0 EXCAVATION AREA Pe~Appendix0 O-4100(c)(3)
(Note 5)
NA Acceptabie Acceptable
~~
~
V No Inc cat.os fourd n
~nn~
V F3epa.r Neeoed See Atlacbnet 2, DM Wed No Postulates Rae el 9.8% Act. vs.
oute 25°C Repair Ama 5 1
Circ 2.73% Max Pana,Fiaws 8.6%Allowable YES Axis:
7 96% Max NA SS Wed Acceptable
~v ~
-. V.-.
~ ___
~
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, Ropa r Nnccec See A6achmert 2, C rc 0 20t~Max No Postularee Rae m
~vs.
nepal Aea x 2 Ax a 1
1 7% Mae Pa]a Flaws 8.8 Allowable YES Corh,cd a Ird 7A I_
4
,,, ~
~
~nn~v, N A Acceoabie Reca r Neoced See At;acbriert 2.
No Postulaed Rads 22.6 Act. vs.
Rvp:. r Au-a v 2 Pana Flaws 9.2 Allowable YES NA Accepabe
~
~
~
~ Rj~r Needed Sac AOachmeat2 No PosI..1a:ed Dade
~
Reos r Ama C 2 Panai Flaws 8.9 Allowable YES
~
4~Ia NA Accep:ab e Hno,~irNeeded See Attach-mI: 2.
No Postuixtxd Radial 13.7 vs.
Re,ar Arvn 1 3 Pans, Saws 8.7 Allowable YES N ~\\
/i cprab V
~VV fl,.1 r
, nnrl S Alt, car-art 2 Oo icsl
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1 9.4 vs.
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8.8 Allowable YES 1.5
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.r i, 8.8 Allowable S
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V 18.8% Actual xx.
89% Allowable (I 1.
INDICATION NOZZLE ID NUMBER INDICATION TYPE UT MEASURED UT MEASURED UT MEASURED UT MEASURED DEPTH FROM OUTSIDE SURFACE TO CENTER OF FLAW IND.
LENGTH OF FLAW INDICATION MEASURED ON 00 POSITION OF FLAW INDICATION FROM REFERENCE MARK (As Marked on Sketches) 1A CIRCUMF.
POSITION OF FLAW INDICATION IN INCHES FROM 0 REFERENCE POINT (Note 2)
Planar UT MEASURED HEIGHT OF FLAW IND.
0.23 AVERAGE THICKNESS OF OVERLAY IN LOCATION OF FLAW INDICATION (Note 4) 6 8 UT MEASURED WIDTH OF LAMINAR FLAW IND.
7.65 9.3 0.180 SAFETY C 0.92 N/A 2A Planar 0.389 2.95 5.15 8.3 0.35 0.85 N/A 3A Planar 0.65 4.8 3.85 2.75 0.243 0.53 N/A 4A Planar 0.32 4.2 3.95 4.75 0.14 0.84 N/A 5A Planar 0.35 3.75 7.8
-8.0 0.25 0.91 N/A 6A Planar 0.40 1,7 7.0
-8.0 0.16 0.85 N/A 7A planar 0.33 Laminar 2.70 0312 5.2 0.80 8.1 4.65 0.14
.5.4 0.87 0
N/A 0.90 0.30 PORV 2
Laminar 0290 0,40 485
-6.50 0
090 030 3
Laminar 0.47 0.75 3.85
-8.82 0
096 030 1A Planar 0.30
~0 78
-7.0 0.03 0.6 N/A 2A Planar 0.61 9,5 4.5 46 070 08 N/A 3A Planar 0.67 4 0 6.25 6.35 0.30 0 30 N/A
Table 1 Page 3 of 4 Indications for Bi Ri 4 PressurIzer Weld Overlays (Pre-Weld Repairs)
INDICATION DISPOSITION NOZZLE ID INDICATION NUMBER INDICATION TYPE UT MEASURED DEPTH FROM OUTSIDE SURFACE TO CENTER OF FLAW IND.
UT MEASURED LENGTH OF FLAW INDICATION MEASURED ON 00 SPRAY UT MEASURED POSITION OF FLAW INDICATION FROM REFERENCE MARK (As Marked on Sketches)
No Indications UT MEASURED CIRCUMF.
POSITION OF FLAW INDICATION IN INCHES FROM 0 REFERENCE POINT (Note 2)
No Indications UT MEASURED HEIGHT OF FLAW IND.
No Indications AVERAGE THICKNESS OF OVERLAY IN LOCATION OF FLAW INDICATION (Note 4)
No Indications No Indications UT MEASURED WIDTH OF LAMINAR FLAW NO.
No Indications 1
Laminar 0,86 9.5 9.5 5.6 0
0.80 0.30 No Indications
<10% Reduction In Coverage Per Appendix 0 0-41 00(c)(2)
(Note 5)
No Indications No Indications Flaw Propagation in outer 25% of underlying weld! base metal IWB-3640 Eva I.for assumed flaw Per Appendix 0 0-4200(a)
Per Appendix 0 0-41 00(c)(3)
REMARKS SURGE 2
Laminar 0.85 5.85 5.9 6.0 0
0.83 0.40 3
Laminar 0.85 4.25 5.9 12.8 0
0.75 0.40 4
Lananar 089 3/5V~
59 22.0 0
085 030 5
6 Lamnar Laminar 0.82 0.31 375~
0.70 57 6.0 50
~80 0
0 0.80 0.83 0 35~V 0,40 FLAW INDICATION Table IWB-3514 2 Inservice INCLUDED IN WB 3514-3 Examination for IWB-3514-2 Preservice REPAIR (Square Inches) assumed flaws Examination EXCAVATION AREA NA NA I
N A I
N,A No Indicat one fosnd NA I
NA o,iter 25%
Accextáble Acceøtable Acceptabe Acreotabe No Indcaors ~o~nc 2 5V~xs 7 5 allow DM Weld A
an,nar flaw indicatior.s N A o,7o~25%
C rc 1 43°oMax ix a: o rear II e No P aqar Faw lrdicat,ons Axa 2 bS% Max overlayexee acts fuuid ir the PSI ISI None NO SS Wed ne face, teeore. tree Examination VoiL,mes Cic 0 71°,Max sro sr.inspcctao e Asivl 1 -11 3., Max so ama Acceetable Accep:xvle Acceptable 2 tns 75allow A*viarlaw ridcatc,v~
NA exto~rear :1-v No P ala, F am lndica;iois Ce V~ybase me:<i found r :1-v PSI ISI Norio Nfl
- x-face Ire efore, there Exarratior Vo..ir rev no srir.pcctab.e voame Acceptsoe Accepable Accxp1able 1 5 an 75 slon A.., arm ar las 0 cat CPa N A eat ur reor :1-v No P ura Paw Iiuicationx one fly 6cm Ti-al Io,jiS I hp PSIlSl No-e NI)
IPace r p foe t-~r..
I Hr a, On
-ran LamInar 082 o.ew 5.25
-12,0 0
0.88 0.30 NOTES:
~ReductioninOoverae 2
Zero reference point for circumferential dimensions are top dead center of weld for Relief, Safety. The surge and spray was the adjacent elbowextrados, Minus (-) dimensions are counter clockwise direction.
jp,~ Nozzle to Safe-End Weld 3
The Nominal diameters of the components are as follows: Safeties/PORV: 6.0, Spray 4.0, Surge: 14.0
~
End to Fl e\\Neld~~
4 Measured from the weld overlay OD surface perpendicular to the pipe axis to the weld overlay/base metal interface using the nearest cross-section profile.
5 Reduction in coverage shows the total reduction for both the nozzle to safe-end and safe-end to pipe welds. Reduction in coveragevalues for individual flaws are not shown, Reduction in coverage for axial and circumferential direction is calculated separately per the requirements of EFRI MRF-139 Paragraph 5,1.5,
INDICATION NOZZLE ID NUMBER INDICATION TYPE UT MEASURED DEPTH FROM OUTSIDE SURFACE TO CENTER OF FLAW IND.
UT MEASURED LENGTH OF FLAW INDICATION MEASURED ON 00 UT MEASURED POSITION OF FLAW INDICATION FROM REFERENCE MARK (As Marked on Sketches)
UT MEASURED CIRCUMF.
POSITION OF FLAW INDICATION IN INCHES FROM 0 REFERENCE POINT (Note 2)
UT MEASURED HEIGHT OF FLAW IND.
AVERAGE THICKNESS OF OVERLAY IN LOCATION OF FLAW INDICATION (Note 4)
Table 2 Indications forBi R14 Pressurizer Weld Overlays (Post-Weld Repairs)
UT MEASURED WIDTH OF LAMINAR FLAW IND.
SAFETY A 1
Laminar 0.61° 2.1 3.20
-1,7 13
.67° 0.4 1A Planar 0.62 2.1 3.65
-2.6 0.11
.63 N/A SAFETY C No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications PORV No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications NOTES; Table IWB-3514-3 (Square Inches)
<100/, Reduction In Coverage Per Appendix 0 0-41 00(c)(2)
(Note 5)
IP4IJIt..,R I IIJI4 UI~rI.J~II lJF4 IWB-351 4-2 Inservice Examination for assumed flaws IWB-3514-2 Preservice Examination Flaw Propagation in outer 25% of underlying weld! base metal Per Appendix 0 0-4200(a)
IWB-3640 Eval. for assumed flaw Per Appendix 0 0-41 0O(c)(3)
FLAW INDICATION INCLUDED IN REPAIR EXCAVATION AREA Page 4 of 4 REMARKS 1
All flaw Indications are in the circumferential direction, 2
Zero reference point for ciicurnferential dimensions are top dead center of weld for Relief, Safety. The surge and spray was the adjacent elbow extrados, Minus (-) dimensions are counter clockwise direction.
3 The Nominal diameters of the components are as follows: Safeties/PORV: 6.0, Spray 4.0, Surge: 14.0 4
Measured from the weld overlay CD surface perpendicular to the pipe axis to the weld overlay/base metal interface using the nearest cross-section profile, 5
Reduction in coverage shows the total reduction for both the nozzle to safe-end and safe-end to pipe welds, Reduction in coverage values for individual flaws are not shown. Reduction in coveragefor axial and circumferential direction is calculated separately per the requirements of EFRI letRP-139 Paragraph 5.1.5.
N/A No Repair Needed
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