BYRON 2006-0119, Pressurizer Weld Overlay Examination Results Related to Relief Request I3R-08

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, ~31d 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 Flaw Indication Assessment Summary Indications Safety A 2 Planar Indications One planar indication 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 Four (4) laminar indications were unacceptable due to associated Planar Indications 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 Attachment 2, page 1). All seven (7) planar indications were unacceptable and were removed in the repair excavation (See Attachment 2, page 2).

PORV 3 Laminar Indications and 3 All three (3) laminar indications were acceptable. Two (2) Planar Planar Indications 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 Flaw Indication Assessment Summary Indications Safety A 1 Laminar Indication and 1 All indications were found to be acceptable.

Planar Indication 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.

Attachment 1 Safety A Nozzle Weld Repair Area, 1 page.

Attachment 2 Safety C Nozzle Weld Repair Area, 2 pages.

Attachment 3 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, ~31d 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 Flaw Indication Assessment Summary Indications Safety A 2 Planar Indications One planar indication 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 Four (4) laminar indications were unacceptable due to associated Planar Indications 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 Attachment 2, page 1). All seven (7) planar indications were unacceptable and were removed in the repair excavation (See Attachment 2, page 2).

PORV 3 Laminar Indications and 3 All three (3) laminar indications were acceptable. Two (2) Planar Planar Indications 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 Flaw Indication Assessment Summary Indications Safety A 1 Laminar Indication and 1 All indications were found to be acceptable.

Planar Indication 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.

Attachment 1 Safety A Nozzle Weld Repair Area, 1 page.

Attachment 2 Safety C Nozzle Weld Repair Area, 2 pages.

Attachment 3 PORV Nozzle Weld Repair Area, 1 page.

Table 1 Page 1 of 4 Indications for Bi R14 Pressurizer Weld Overlays (Pre-Weld Repairs)

_____________ ____________ INDICATION DISPOSITION ______ _____________

UT MEASURED UT MEASURED POSITION OF CIRCUMF. AVERAGE UT MEASURED UT MEASURED FLAW POSITION OF THICKNESS OF ~10% Reduction In .

DEPTH FROM LENGTH OF UT MEASURED coverage Flaw Propagation in WB-3640 Eva. tor FLAW INDICATION INDICATION FLAW UT MEASURED OVERLAY IN INDICATION INDICATION OUTSIDE FLAW WIDT -

~abIe IWB-3514-~ . Inservice . . outer 25% of underlying assumedflaw INCLUDED IN REMARKS NOZZLE ID FROM INDICATION IN HEIGHT OF LOCATION OF NUMBER TYPE SURFACE TO INDICATION LAMINAR FLAW IWB-3514-3 Per Appendix 0 Examination for IWB-3514-2 Preservice weld/ base metal REPAIR REFERENCE INCHES FROM 0 FLAW IND. FLAW CENTER OF MEASURED ON IND. (Square riches) Q-4100(c)(2) assumed flaws Examination . Per Appendix 0 EXCAVATION AREA MARK REFERENCE INDICATION FLAW IND. 00 PerAppendix 0 0-41 OO(c)(3)

(As Marked on POINT (Note 4)

Sketches) (Note 2) (Note 5) 1 1 Planar 0.2 175 65 -30 No Measurable 67 N /~ NA AcceptabJe Acce~~ab 0 Accoplabe No I~ca~ ors lound ~ ~ ~ ~ ~~ Flepii Needed, See Attachment 1 Depth 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 SAFETYA ~.-

2 Planar 0.50 4.0 5.0 20 0.31 0.70 N A N A ~ We;o No NC Acce~ab~o ~ ~ ~ ~ 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 No No No No No No No No NA N A NA N A No mo ca~osfo~nd r ~ A N A SAFETY B Indications Indications Indications Indications Indications Indications Indications Indications li~c~ilors o~~er 25°i~

1 Laminar 0.79 4.85 4.2 0 0 0.81 0.28 Acceptaoe Accepla~ie Accepab e N A No lrdicat ocx ojd ~ ~ <°~~~ 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. NA YES 55 Weld te~o s cc, xr~rcaectawe Circ U 2O~,Max vo imo Axi,1 I 1 1°~ Max 2 Laminar 0.24- 0.33 2.50 4,8 7.9 0 0.86° 0.30 Acc~p1abic -~ .~ ~ ~ ~ NA ~ ~ ~ ~ ~ Flepa r Ned~d°ei~ Atachmet 2 0 7 vs 7 5. aloe Circ ~ L~ ix Fix ~ YES Ar~

Unacceptable:

Axial: 20.3 Act vs. 12.5 74 3 Laminar 0 275- 0.285 5.4 7.1 0 0.93 0.25 IA 1 . 1, . ,.n Ca. 38 A,.t 10 / L. . i ~

Ai:owable Unacceptable; YES Axial: 34.4 Act vs. 10.9 Allowable 4 Laminar 0.20 1.20 3.3 13.0 0 0.72 025 0.

.3 , 5.0 ~C R3Ac1 I I Alo: a ~  : ,

Unacceptable:

Axial: 15.3 Act. vs 123 Allo~jahte 0 50 5 Laminar 0.23 2 .5 11.5 12.4 0 0.48 Circ :20.0 Act. vs 11.7 . .. i V.

SAFETY C Allowable V . .

Unacceptable: , V Axial: 27.8 Act. vs. 123 Allowable 6 Laminar 0.15 0.90 8 85 -790 0 0.69 0.20 . ~

Cic 61)/nO n.~ 13 a ,

Unacceptable: YES Axial: 14.9 Act. vs 12 5 Allowable 7 Laminar 0.18, 0.90, 7.3 -110 0 0.97 0.40 -e~n~,&---~In -V._-._

V.. ..c,u._t,...

V V YES 3 Laminar 0.39 2 25 7.0 -6.7 0 0.87 V V. V 0 , , -a  :~r.,.,, :9 . V i V Ay.rc Unacceptsbte YES Axial. 27.J Act. vs 12.5 Allowable 0.9 47 7 2 9311 9 Laminar 0 38 0 0.80 ~ ,. V lie

Table 1 Page 2 of 4 Indications for B1R14 PressurIzer Weld Overlays (Pre-Weld Repairs)

INDICATION DISPOSITION ________

UT MEASURED UT MEASURED POSITION OF CIRCUMF. AVERAGE UT MEASURED UT MEASURED <10% Reduction In FLAW POSITION OF THICKNESS OF .

DEPTH FROM LENGTH OF UT MEASURED INDICATION FLAW UT MEASURED OVERLAY IN Coverage Flaw25%

Propagation in IWB-3640 Eval. for FLAW INDICATION INDICATION OUTSIDE FLAW WIDTH OF Table IWB 3514-2 Inservice . . V outer of underlying assumed flaw INCLINDICATION DED IN NOZZLE ID FROM INDICATION IN HEIGHT OF LOCATION OF . . . IWB.J514-2 Preservice weld! base metal NUMBER TYPE SURFACE TO INDICATION LAMINAR FLAW IWB-3514-3 Per Appendix 0 ExaminatiOn for .

REFERENCE INCHES FROM 0 FLAW IND. FLAW CENTER OF MEASURED ON IND. (Square Inches) 0 4100(c)(2) assumed flaws Examination . PerAppendix 0 EXCAVATION AREA MARK REFERENCE INDICATION FLAW IND. 00 Pe~Appendix0 O-4100(c)(3)

(As Marked on POINT (Note 4)

Sketches) (Note 2) (Note 5) 1A Planar 0.23 6 8 7.65 9.3 0.180 0.92 N/A 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 2A Planar 0.389 2.95 5.15 8.3 0.35 0.85 N/A NA SS Wed Acceptable ~v ~ -. V.-. ~ ___ ~ ~1i~ , 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 I_ ,,, ~ ~ ~nn~v, Corh,cd a Ird 7A 4

3A Planar 0.65 4.8 3.85 2.75 0.243 0.53 N/A NA 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 4A Planar 0.32 4.2 3.95 4.75 0.14 0.84 N/A NA Accepabe ~ ~ ~ ~ Rj~r Needed Sac AOachmeat2 No PosI..1a:ed Dade ~ Reos r Ama C 2 SAFETY C Panai Flaws 8.9 Allowable YES

~ 4~Ia .... .. .. _____________________________

5A Planar 0.35 3.75 7.8 -8.0 0.25 0.91 N/A 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 6A Planar 0.40 1,7 7.0 -8.0 0.16 0.85 N/A N ~\ /i cprab 1 - V ~VV fl, .1 r , nnrl S Alt, car-art 2 Oo icsl ,~ i,, 9.4 vs. - I . V I ~. 8.8 Allowable YES 7A planar 0.33 2.70 5.2 8.1 1.5 ~ ~~!V YE 0.14 0.87 N/A a., .r i, 8.8 Allowable S Laminar 0312 0.80 4.65 .5.4 0 0.90 0.30 - v Ai cc,,ta . 4cc. 7, I , 4 ,. V. V i V. V 3, 1. , 1, sass a .1 V/&ri / . . V 1/ c).6 Ma, 3 A .,,~ 1 X~ 1 ,l .1:.. 5,,,.: ..

SS,Ielj 2 Laminar 0290 0,40 485 -6.50 0 090 030 3 Laminar 0.47 0.75 3.85 -8.82 0 096 030 PORV 78 1A Planar 0.30 ~0 -7.0 0.03 0.6 N/A 2A Planar 0.61 9,5 4.5 46 070 08 N/A 21 Actual vs.

8.8°~ Allowable ,

V V784~~/8 ~

3A Planar 0.67 4 0 6.25 6.35 0.30 0 30 N/A V iiiacceplabl . .. V 18.8% Actual xx.

89% Allowable , , (I 1.

Table 1 Page 3 of 4 Indications for Bi Ri 4 PressurIzer Weld Overlays (Pre-Weld Repairs)

INDICATION DISPOSITION UT MEASURED UT MEASURED POSITION OF CIRCUMF. AVERAGE UT MEASURED UT MEASURED <10% Reduction In FLAW POSITION OF THICKNESS OF Flaw Propagation in FLAW INDICATION DEPTH FROM LENGTH OF UT MEASURED Coverage IWB-3640 Eva I. for INDICATION FLAW UT MEASURED OVERLAY IN outer 25% of underlying INDICATION INDICATION OUTSIDE FLAW WIDTH OF Table IWB-3514 2 Inservice . assumed flaw INCLUDED IN NOZZLE ID FROM INDICATION IN HEIGHT OF LOCATION OF REMARKS NUMBER TYPE SURFACE TO INDICATION LAMINAR FLAW weld! base metal WB 3514-3 Per Appendix 0 Examination for IWB-3514-2 Preservice REPAIR REFERENCE INCHES FROM 0 FLAW IND. FLAW CENTER OF MEASURED ON NO. (Square Inches) 0-41 00(c)(2) assumed flaws Examination Per Appendix 0 EXCAVATION AREA MARK REFERENCE INDICATION Per Appendix 0 FLAW IND. 00 0-41 00(c)(3)

(As Marked on POINT (Note 4) 0-4200(a)

Sketches) (Note 2) (Note 5)

SPRAY No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications No Indications NA NA I NA I N,A No Indicat one fosnd o,iter 25%

NA I NA 1 Laminar 0,86 9.5 9.5 5.6 0 0.80 0.30 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°o Max 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 2 Laminar 0.85 5.85 5.9 6.0 0 0.83 0.40 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 3 Laminar 0.85 4.25 5.9 12.8 0 0.75 0.40 Acceptsoe Accepable Accxp1able 1 5 an 75 slon A.., arm ar las 0 cat CPa NA eat ur reor :1-v No P ura Paw Iiuicationx one fly 6cm Ti-al Io,jiS I hp PSIlSl No- e NI)

IP ace r p foe t-~r.. I Hr a, On -ran 3/5V~ 59 4 Lananar 089 22.0 0 085 030 SURGE 375~ 57 5 Lamnar 0.82 50 0 0.80 0 35~V 6 Laminar 0.31 0.70 6.0 ~80 0 0.83 0,40 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 elbow extrados, 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 coverage values 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,

Table 2 Page 4 of 4 Indications for Bi R14 Pressurizer Weld Overlays (Post-Weld Repairs)

IP4IJIt..,R I IIJI4 UI~rI.J~II lJF4 UT MEASURED UT MEASURED POSITION OF CIRCUMF. AVERAGE UT MEASURED UT MEASURED <100/, Reduction In FLAW POSITION OF THICKNESS OF Flaw Propagation in DEPTH FROM LENGTH OF UT MEASURED Coverage IWB-3640 Eval. for FLAW INDICATION INDICATION FLAW UT MEASURED OVERLAY IN outer 25% of underlying INDICATION INDICATION OUTSIDE FLAW WIDTH OF Table IWB-351 4-2 Inservice assumed flaw INCLUDED IN NOZZLE ID FROM INDICATION IN HEIGHT OF LOCATION OF IWB-3514-2 Preservice weld! base metal REMARKS NUMBER TYPE SURFACE TO INDICATION LAMINAR FLAW IWB-3514-3 Examination for REPAIR REFERENCE INCHES FROM 0 FLAW IND. FLAW Per Appendix 0 CENTER OF MEASURED ON Examination EXCAVATION AREA IND. (Square Inches) 0-41 00(c)(2) assumed flaws Per Appendix 0 MARK REFERENCE INDICATION Per Appendix 0 FLAW IND. 00 (As Marked on POINT (Note 4) 0-41 0O(c)(3) 0-4200(a)

Sketches) (Note 2) (Note 5) 1 Laminar 0.61° 2.1 3.20 -1,7 13 .67° 0.4 SAFETY A 1A Planar 0.62 2.1 3.65 -2.6 0.11 .63 N/A N/A No Repair Needed No No No No No No No No No SAFETY C Indications Indications Indications Indications Indications Indications Indications Indications Indications PORV No No No No No No No No No Indications Indications Indications Indications Indications Indications Indications Indications Indications NOTES; 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 coverage for axial and circumferential direction is calculated separately per the requirements of EFRI letRP-139 Paragraph 5.1.5.

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