ML15216A359
| ML15216A359 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/30/2015 |
| From: | Mark D. Sartain Dominion, Dominion Nuclear Connecticut |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 15-309 | |
| Download: ML15216A359 (31) | |
Text
Dominion Nuclear Connecticut, Inc. i'i'IDom.wna on 5000 Doniinion Boulevard, Glen Allen, VA 23060 -~'~EENO Web Address: www.dom.com July 30, 2015 U.S. Nuclear Regulatory Commission Serial No.15-309 Attention: Document Control Desk NLOS/WDC R0 Washington, DC 20555 Docket No. 50-336 License No. DPR-65 DOMINION NUCLEAR CONNECTICUT. INC.
MILLSTONE POWER STATION UNIT 2 ASME SECTION Xl INSERVICE INSPECTION PROGRAM RELIEF REQUESTS FOR LIMITED COVERAGE EXAMINATIONS PERFORMED IN THE FOURTH 10-YEAR INSPECTION INTERVAL The Millstone Power Station Unit 2 (MPS2) fourth 10-year interval for the inservice inspection program began on April 1, 2010. During the first inspection period of this interval, the components identified in Attachments 1 through 3 received less than the required examination coverage. Accordingly, pursuant to 10 CFR 50.55a(g)(5)(iii),
Dominion Nuclear Connecticut, Inc. requests relief on the basis that the required examination coverage was impractical due to physical obstructions and limitations imposed by design, geometry and materials of construction of the subject components.
Attachments 1 through 3 contain the specific relief requests and the individual basis for each request. These relief requests have been reviewed and approved by the station's Facility Safety Review Committee.
If you have any questions or require additional information, please contact Wanda Craft at (804) 273-4687.
Sincerely, Mark D. Sartain Vice President - Nuclear Engineering
Serial No.15-309 Docket No. 50-336 Page 2 of 2 Attachments:
- 1. Relief Request RR-04-1 7 - Examination Category B-D, Full Penetration Welded Nozzles in Vessels - Inspection Program B.
- 2. Relief Request RR-04-18, Examination Category C-A, Pressure Retaining Welds in Pressure Vessels.
- 3. Relief Request RR-04-19, Examination Category R-A, Risk Informed Piping Examinations.
Commitments made in this letter: None cc: U.S. Nuclear Regulatory Commission Region I 2100 Renaissance Blvd, Suite 100 King of Prussia, PA 19406-2713 R. V. Guzman Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08-C 2 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
Serial No.15-309 Docket No. 50-336 ATTACHMENT I RELIEF REQUEST RR-04-17 EXAMINATION CATEGORY B-D FULL PENETRATION WELDED NOZZLES IN VESSELS INSPECTION PROGRAM B DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 2
Serial No.15-309 Docket No. 50-336 Attachment 1, Page 1 of 7 Relief Requested In Accordance with 10 CFR 50.55a(g)(5)(iii)
Inservice Inspection Impracticality
- 1. ASME Code Components Affected:
ASME Code Class: Code Class 1 Examination Category: B-D, Full Penetration Welded Nozzles in Vessels -
Inspection Program B Item Numbers: B3.130, Steam Generator (Primary Side), Nozzle-To-Vessel Welds Component Identification: Listed in Table 1 Material: SA508, CL3 Carbon Steel with Internal Stainless Steel Cladding
- 2. ADD~icable Code Addition and Addenda ASME Section Xl, 2004 Edition, No Addenda
3. Applicable Code Requirement
ASME Section XI, 2004 Edition, Examination Category B-D requires volumetric examination of 100 percent (%) of the weld volume as defined in Table IWB-2500-1 and shown in figure IWB-2500-7. The alternative requirements of ASME Section Xl, Code Case N-460, approved for use in Regulatory Guide 1.147, Rev. 17, allows credit for essentially 100% coverage of the welds provided greater than 90% of the required volume has been examined.
- 4. Impracticality of Compliance I I I Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from the 100% volumetric examination coverage requirement of the subject welds due to the geometric configuration which limit the volumetric coverage that can be obtained.
The subject steam generator nozzle-to-vessel welds, were examined with a manual ultrasonic technique using pulse echo ultrasonic instruments and search units to achieve the maximum examination coverage practical. Limitations imposed by the nozzle configuration preclude obtaining 100% coverage. This configuration, with the
Serial No.15-309 Docket No. 50-336 Attachment 1, Page 2 of 7 nozzle outside radius within close proximity of the weld, prevents complete scanning in these areas due to lift-off of the search unit that occurs causing a loss of contact between the search unit and the component.
No alternative techniques or advanced technologies were considered capable of obtaining complete coverage of the examination volume.
Isometric drawing and coverage calculations are provided in this attachment.
TABLE 1- Examination Category B-D Welds with Limited Volumetric Coverage Examination Examination Weld Code Angle and Wave Limitations and Coverage Identification Item # Configuration Mode Results (%)
SG-2-NH-2-A 83.130 30" Cold Leg 00 Long Wave Scan limitations due 73.3%
Nozzle to 30° Shear Wave to configuration of the Hemisphere 450 Shear Wave nozzle. No 600 Shear Wave recordable indications were detected.
SG-2-NH-4-A B3.130 42" Hot Leg Nozzle 00 Long Wave Scan limitations due 72.5%
to Hemisphere 300 Shear Wave to configuration of the 450 Shear Wave nozzle. No 600 Shear Wave recordable indications were detected.
SG-2-NH-5-A B3.130 30" Cold Leg 00 Long Wave Scan limitations due 72.4%
Nozzle to 3Q0 Shear Wave to configuration of the Hemisphere 450 Shear Wave nozzle. No 600 Shear Wave recordable indications were detected.
- 5. Burden Caused by Compliance To increase examination coverage on the subject welds would require a significant design modification or replacement of components with a different design to eliminate the noted obstructions which is considered to be impractical due to the cost, additional radiation exposure and impact to plant equipment.
- 6. Proposed Alternative and Basis for Use The subjectonwelds techniques received a volumetric examination using the best available the accessible portions of welds to the extent practical. Additionally, a visual (VT-2) examination is performed at the end of each refueling outage during the system leakage tests as required by Section XI, Table IWB-2500-1, Category B-P.
Serial No.15-309 Docket No. 50-336 Attachment 1, Page 3 of 7 Based upon the examination volumes that were obtained with acceptable results and the visual (VT-2) examination performed each refueling outage, it is reasonable to conclude that service-induced degradation would be detected. Therefore, these proposed alternatives will provide an acceptable level of quality and safety by providing reasonable assurance of structural integrity of the subject welds.
- 7. Duration of Proposed Alternative The relief is requested for the fourth ten-year inspection interval for Millstone Power Station Unit 2, which began on April 1, 2010 and will end March 31, 2020.
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Weld ID: SG-2-1NH-2-A I / Coverage Total:
00 Subtotal:
00 = 66.7%
Weld Subtotal:
US 300 58.9%
Total Code Exam Volume DS 30 0,= 100%
VS 450 3 7.5%
~eld = 7.8263" DS 450 100%
ozzle = 16.8720" US 60° = 22.8%
tatl =41.7606 DS 600= 85.1%
300 US Weld* 300 CW = 100%
300 CCW = 100%
450 CW= 100%
450 CO = 100%
Total = 804.3 11I0 = 80.4%
DS Weld 2.9333" = 37.5%\I Base metal Subtotal:
Axial 300 / 450 / 60*= 95.5%
Circumferential 3001/ 450, = 50.3%
Total =145.8 / 2 = 72.9%
300 CW Weld 100% Coverage Total:
\I/00, CCW Weld 100% 66.7 + 80.4 + 72.9 = 220.0 /3 =73.3%
600 US Weld*-*-- II45°
~j~ 50 CW CCWXWeldWeld100%
J00%
1.7375" = 22.8%* = 85.1% I.oD Scale 1:6 Area dimensions determined with TurboCad 19 "0ZZ So o~C,
-.olo~o
Weld ID: SG-2-NH-4-A Coverage Total:
90 Subtotal:
U.
CAm! UflU4.LII ase metal exam 90° 64.6%
Weld Subtotal:
"DS 30° = 44.8%
5.7198" =90,8% US 300 .100%
DS 450 = 27.6%
US 450 = 100%
DS 60 = 16.3%.
US 60° = 100%
CW 30 0 =l100%
Kif ogle CWICCW CCW 30° = 100%
e metal exam CW 45 0 =100%
8.7921" = 57.2% CCW 450 = 100%
Total =788.7 /10 =78.9%
Base metal Subtotal:
Axial 300 / 450 1600 " 90.8%
Circumferential 300 / 450 = 572.%
Total =148!/2 =74%
US Weld Coverage Total:"
64.6 + 78.9 + 74 217.5/¢ 372,5%
313" =64.6%
Scale 1:6 Area dimensions determined 45DS WeldKN-~-N-7 with TurboCad 19 2.8646":= 27"6%
\ /451
- 0 CW Weld 100%
145 o~ed I
CW 30CCW 00%
Weld 100%
°CW Weld 100%
0>
60 DS '~l*-*- *7. D 1.6915" = !6.3%* 3817" =100%
"JZZ
( o o CD.1-0)-ho00
Weld ID" SG-2-NH-5-A rmTp~ngke CW/CCW IIH~ emetal exam Coverage Total:
00 Subtotal:
0o =64.8%
Weld Subtotal:
US 300 = 58.6%
DS 30 0 = 100%
US 450 = 36.8%
DS 450 = 97.4%
4.5289" = 58.6%! ij~~j 732 -100% US 60° = 22.4%
I --773Q0o DS,,Weld DS 600 = 65.4%
300 CW = 100%
30° CCW = 100%
450 CW = 100%
Total = 780.6 /10 =78.1%
2.8460" US 450 Weld*
= 3.%
7.5277" = 97 4%
Base metal Subtotal:
Axial 300°1450 / 6 00 = 94.1%
Circumf'erential 30° / 45° = 56.5%
Total = 150.6 /2 = 75.3%
300 CW Weld 100%
600 US Weldt,,-j,-c* F 6 0
° DS Weld \II °11450 CWVWeld 100% 64.8 + 78.1 + 75.3 = 21!7.2 / 3 =72.4%
1.7311" = 22.4% N-> V 1 .0549" = 65.4%
Scale 1:6 "7-Area dimensions determined with TurboCadl 19 z CD O O 0n CA (D O)
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Serial No.15-309 Docket No. 50-336 ATTACHMENT 2 RELIEF REQUEST RR-04-18 EXAMINATION CATEGORY C-A PRESSURE RETAINING WELDS IN PRESSURE VESSELS DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 2
Serial No.15-309 Docket No. 50-336 Attachment 2, Page 1 of 6 Relief Requested In Accordance with 10 CFR 50.55a(g)(5)(iii)
Inservice Inspection Impracticality
- 1. ASME Code Components Affected:
ASME Code Class: Code Class 2 Examination Category: C-A, Pressure Retaining Welds in Pressure Vessels Item Numbers: C1 .10, Shell Circumferential Welds C1 .30, Tube Sheet-to-Shell Weld Component Identification: Listed in Table I Material: SA 515, GR 70 Carbon Steel with Internal Stainless Steel Cladding
- 2. Applicable Code Addition and Addenda ASME Section Xl, 2004 Edition, No Addenda
- 3. Applicable Code Requirement ASME Section Xl, 2004 Edition, Category C-A requires volumetric examination of 100 percent (%) of the weld length as defined in Table IWC-2500-1 and shown in Figure IWC 2500-1 and IWC-2500-2. The alternative requirements of ASME Section Xl, Code Case N-460, approved for use in Regulatory Guide 1.147, Rev. 17, allows credit for essentially 100% coverage of the welds provided greater than 90% of the required volume has been examined.
- 4. Impracticality of Compliance Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from the 100% volumetric examination coverage requirement of the subject welds due to the geometric configuration and permanent obstructions which limit the volumetric coverage that can be obtained.
The Shutdown Cooling heat exchanger tube sheet-to-shell weld (SIAC-AI) and the flange-to-shell weld (SIAC-A2) were examined with a manual ultrasonic technique using the best technology available to achieve the maximum examination coverage practical. The examinations were performed using pulse echo ultrasonic instruments and transducers. No alternative techniques or advanced technologies
Serial No.15-309 Docket No. 50-336 Attachment 2, Page 2 of 6 were considered capable of obtaining complete coverage of the examination volume.
The position of the heat exchanger tube sheet flange limits the examination coverage of the subject tube sheet-to-shell weld. The tube sheet flange is located within close proximity of the weld and there is not sufficient distance from the flange to the weld to allow complete scanning on that side of the weld. This restricts the axial scan coverage that can be obtained.
The position of the heat exchanger channel cover flange limits the examination of the subject flange-to-shell weld. The channel cover flange is located within close proximity of the weld and there is not sufficient distance between the flange and weld to allow complete scanning on that side of the weld. This restricts the axial and circumferential coverage that can be obtained.
Isometric drawing and coverage calculations are provided in this attachment.
TABLE 1- Examination Category C-A Welds with Limited Volumetric Coverage Examination Weld Code Angle and Wave Identification Item # Mode Limitations and Results Configuration S IAC-A1 ClI.30 Tube Sheet to 450 Shear Wave Limited examination due to 81.5%
Shell Weld 600 Shear Wave the location of the tube sheet that obstructs the axial scans on that side of the weld. One recordable indication was detected that was evaluated as acceptable root geometry.
SIAC-A2 C1.10 Flange to Shell 450 Shear Wave Limited examination due to 63.8%
Weld 600 Shear Wave the location of the flange that obstructs axial and circumferential scans on that side of the weld. No recordable indications were detected.
- 5. Burden Caused by Compliance To increase examination coverage on the subject welds would require a significant design modification or replacement of the component with a different design to eliminate the noted obstructions. This option to meet the 100% Code examination requirement is considered impractical due to the cost, increased radiation exposure and impact to plant equipment.
Serial No.15-309 Docket No. 50-336 Attachment 2, Page 3 of 6
- 6. Proposed Alternative and Basis for Use The subject welds received a volumetric ultrasonic examination using the best available techniques on the accessible portions of welds to the maximum extent practical. Additionally, a visual (VT-2) examination is performed during each inspection period during the system leakage tests as required by Section Xl, Table IWC-2500-1, Category C-H.
Based upon the examination volumes that were obtained with acceptable results and the visual (VT-2) examination performed each inspection period, it is reasonable to conclude that service induced degradation would be detected.
Therefore, these proposed alternatives will provide an acceptable level of quality and safety by providing reasonable assurance of structural integnity of the subject welds.
- 7. Duration of Proposed Alternative The relief is requested for the fourth ten-year inspection interval for Millstone Power Station Unit 2, which began on April 1, 2010 and will end March 31, 2020.
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Serial No.15-309 Docket No. 50-336 Attachment 2, Page 5 of 6 Scale 1."= 1.32" f
.1 --- FL.OW Il22" 127" IYJ 1U)3 1.3S IJ3 I,2V Tubesheet Shell
~Required Examination Volume-3.217 Sq. Inches
~'Axial Examination Downstream Area of No Coverage - .021!5 Sq Inches.
(.26 * .1J9 / 2) (1%)
- \ Axial Examination Upstream Area of No Coverage - 2.33 Sq Inches. (73%)
~(Area dimensions determined with TiirboCAD 1:9)
Examination VolumeDimensions: Length 140"__* x Width 2.55" x Height j.,3'__'
Weld Thickness-- 1.20" Weld Length: 140" Weld Width: 1.55" (US-27%+-DS-S9%-e.CW-.1OO%+CC.W-100%)/4=100%
Coverage Summary- Weld #1S1AC-Al IRequired Scans- each has a weighing factor of 100% for complete coverage Angle Upstream-Axial Upstream- Circ. Downstream Axial Downstream .Clrc.
456 27% I 100% I 99% "100%
C;ode Coverage Total 81.5%
Best Effort Coverage (Max 25%) Total Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
Serial No.15-309 Docket No. 50-336 Attachment 2, Page 6 of 6 1.32 1.31 1.31 1.31 1.31 1.30) 1.30 1.32 1.36 1.42 1.40 1.41 1.43 1.52
.... 45 /60 .- i 1 60 Flange Shell (lhd
- _./0.8644" = 24.5%/a ovrg Code Examlination Volume 3.5261" CW / CCW Coverage Upstream Axial Coverage 2.4145" = 68.5% 3.301" = 93.6%
Examination Volume Dimensions: Length 140" x Width 2.75"__* x Height 1.40"_*
Weld Thickness= 1.40" Weld Length-- 14__0" Weld Width= 1.75" (UJS-93,6%+DS-24.S%+CW-68,5%+CCW-68,5%) = 255.1/4=63.8%
Coverage Summary- Weld # SIAC-A2 Required Scans- each has a weighing factor of 100% for complete coverage Angle _Upstream-Axial CW - Circ. Downstream-Axial CCW - Circ.
45/60 93.6% _ _ 68.5% 24.5% 68.5%
_________Code Coverage Total 63.8%
____________________ Best Effort Coverage (Max 25%) Total_________
Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively ex{amined with the qualified examination procedure
Serial No.15-309 Docket No. 50-336 ATTACHMENT 3 RELIEF REQUEST RR-04-19 EXAMINATION CATEGORY R-A RISK INFORMED PIPING EXAMINATIONS DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 2
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 1 of 13 Relief Requested In Accordance with 10 CFR 50.55a(g)(5)(iii)
Inservice Inspection Impracticality
- 1. ASME Code Components Affected:
ASME Code Class: Code Class I Examination Category: R-A, Risk Informed Piping Examinations Item Numbers: RI1.11, Elements Subject to Thermal Fatigue RI1.20, Elements Not Subject to a Damage Mechanism Component Identification: Listed in Table 1 Material: Listed in Table I
- 2. Applicable Code Addition and Addenda ASME Section X1, 2004 Edition, No Addenda
3. Applicable Code Requirement
The examination requirements for Class 1 and Class 2 piping welds are governed by the Risk Informed Inservice Inspection program that was approved by the NRC in a letter dated March 27, 2012 (Adams Accession Number ML120800433). The program was developed in accordance with ASME Code Case N-716, "Alternative Piping Classification and Examination Requirements." Code Case N-716, Table I, Examination Category R-A, requires that essentially 100 percent (%) of the weld volume be examined. The alternative requirements of ASME Code Case N-460, approved for use in Regulatory Guide 1.147, Rev. 17, allows credit for essentially 100% coverage provided greater than 90% of the required volume has been examined.
- 4. Impracticality of Compliance Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from the 100% volumetric examination coverage requirement for the subject austenitic welds due to the geometric configuration which limits the volumetric coverage that can be obtained.
The subject welds were examined with a manual ultrasonic technique using pulse echo ultrasonic instruments and search units to achieve the maximum examination
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 2 of 13 coverage practical. Examinations were performed using personnel, equipment and procedures qualified in accordance with ASME Section Xl, Appendix VIII as implemented by the Performance Demonstration Initiative (PDI).
There are currently no PDI qualified single-side examination procedures that demonstrate equivalency to two-sided examination procedures on austenitic piping welds. Current technology is not capable of reliably detecting or sizing flaws on the far side of an austenitic weld for configurations common to U.S. nuclear applications.
PDI Performance Demonstration Qualification Summary (PDQS) certificates for austenitic piping list the limitation that single side examination is performed on a best effort basis. The best effort qualification is provided in place of a complete single side qualification to demonstrate that the examiners qualification and the subsequent weld examination is based on application of the best available technology.
When the examination area is limited to one side of an austenitic weld, examination coverage does not comply with 10 CER 50.55a(b)(2)(xv)(A) and proficiency demonstrations do not comply with 10 CFR 50.55a(b)(2)(xvi)(B) and full coverage credit may not be claimed.
The ASME code required volume of these welds was interrogated ultrasonically to the maximum extent possible. No alternative techniques or advanced technologies were considered capable of obtaining complete coverage of the examination Volume.
Subject welds BPY-C-1 063-A, BPY-C-1 065-A, BPY-C-3070-A, and BPY-C-3072-A were performed as pre-service examinations of new piping welds associated with valve replacements. These welds consist of pipe-to-valve configurations in which the taper of the valve is within close proximity of the weld and there is not sufficient distance between the weld and valve to perform any circumferential or axial scanning on that side of the weld. The examinations are limited to scanning from the pipe side only resulting in a total coverage of 50% for each weld. Supplemental scanning was performed to provide additional best effort (non-code) coverage using a 70 degree shear wave search unit as documented in the enclosed coverage calculation for each weld. Additionally, a liquid penetrant surface examination and radiographic examination was performed on these new welds where 100% coverage was obtained with acceptable results.
Subject weld BPY-C-501 9-A consists of a pipe-to-tee where the radius of the tee is within close proximity of the weld and does not provide sufficient distance from the tee to the weld to perform complete axial scanning on this side of the weld.
Examination in the area of the radius of the tee is limited to axial scanning from the pipe side only resulting in total code coverage of 82.5 %. Supplemental scanning was performed to provide additional best effort (non-code) coverage using a 70
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 3 of 13 degree shear wave search unit as documented in the enclosed coverage calculation for this weld. Additionally, there were six other selected welds within the charging system susceptible to the same degradation mechanism (R1.11, Elements Subject to Thermal Fatigue) for which examinations have been completed with essentially 100% coverage obtained. There were no unacceptable flaws detected during these examinations.
Subject weld BSI-C-3004 consists of a pipe-to-elbow configuration. There is a weld overlay on an adjacent weld that extends to within close proximity of the subject weld and there is not sufficient distance between the weld overlay and elbow side of the weld to perform complete axial scanning from the elbow side. Examination in the area of the elbow restricted by the adjacent weld overlay is limited to scanning from the pipe side only, resulting in a total code coverage of 90%. Supplemental scanning was performed to provide additional best effort (non-code) coverage using a 60 degree longitudinal wave search unit as documented in the enclosed coverage calculation for this weld. Additionally, there were four other selected welds within the safety injection system susceptible to the same degradation mechanism (RI1.11, Elements Subject to Thermal Fatigue) for which examinations have been completed with essentially 100% coverage obtained. There were no unacceptable flaws detected during these examinations.
Since the configuration of the piping limits access to a single side, relief is requested for complying with the 100% required examination coverage for the piping welds listed in Table 1. Note that examination coverage listed in Table 1 is that which was obtained during examination with no credit taken for the far side of each weld.
Coverage calculations are provided in this attachment.
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 4 of 13 Table 1- Examination Category R-A Welds with Limited Volumetric Coverage System I Code Class Configuration Examination Weld Code MaeilExamination Angle Coverage Identification Item # Maeiland Wave Mode Limitations and Results (%)
BPY-C-501 9-A RI1.11 Charging / Class 1 450 Shear Wave Examination limited on the 82.5%
4" Pipe-to-Tee 600 70° Shear Shear Wave Wave downstream of Tee. side due to obstruction Type 316 Stainless One recordable indication detected Steel, Schedule 120 and evaluated as acceptable ID root geometry.
BSI-C-3004 R1.11 Safety Injection!/ 450 Shear Wave Examination limited on the 90%
Class 1 600 Shear Wave downstream side due to close 12" Pipe-to-Elbow 600 Long Wave proximity of adjacent weld overlay.
No recordable indications were Type 316 Stainless detected.
Steel, Schedule 140 BPY-C-1 063-A RI1.20 Reactor Coolant / 45° Shear Wave This was a pre-service examination 50%
Class 1 600 Shear Wave associated with a new weld.
3" Pipe-to-Valve 70O Shear Wave Examination limited to the pipe side due to the taper of the valve within Type 316 Stainless close proximity of the weld. There is Steel, Schedule 160 not sufficient distance between the weld and valve to perform any scanning on the valve side of the weld.
No recordable indications were detected.
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 5 of 13 Table 1- Examination Category R-A Welds with Limited Volumetric Coverage System I Code Class Configuration Examination Weld Code MaeilExamination Angle Coverage Identification Item # Maeiland Wave Mode Limitations and Results (%)
BPY-C-1 065-A RI1.20 Reactor Coolant / 450 Shear Wave This was a pre-service examination 50%
Class 1 600 Shear Wave associated with a new weld.
3" Valve-to-Pipe 7Q0 Shear Wave Examination limited to the pipe side due to the taper of the valve within Type 316 Stainless close proximity of the weld. There is Steel, Schedule 160 not sufficient distance between the weld and valve to perform any scanning on the valve side of the weld.
No recordable indications were detected.
BPY-C-3070-A RI1.20 Reactor Coolant I 450 Shear Wave This was a pre-service examination 50%
Class 1 600 Shear Wave associated with a new weld.
3" Pipe-to-Valve 700 Shear Wave Examination limited to the pipe side due to the taper of the valve within Type 316 Stainless close proximity of the weld. There is Steel, Schedule 160 not sufficient distance between the weld and valve to perform any scanning on the valve side of the weld.
No recordable indications were detected.
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 6 of 13 Table 1- Examination Category R-A Welds with Limited Volumetric Coverage System / Code Class Configuration Examination Weld Code MaeilExamination Angle Coverage Identification Item # Maeiland Wave Mode Limitations and Results (%)
BPY-C-3072-A RI1.20 Reactor Coolant / 450 Shear Wave This was a pre-service examination 50%
Class 1 600 Shear Wave associated with a new weld.
3" Pipe-to-Valve 700 Shear Wave Examination limited to the pipe side due to the taper of the valve within Type 316 Stainless close proximity of the weld. There is Steel, Schedule 160 not sufficient distance between the weld and valve to perform any scanning on the valve side of the weld.
No recordable indications were detected.
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 7 of 13
- 5. Burden Caused by Compliance Compliance with the Code requirements would require extensive modification or replacement of components with a design that would allow full examination from both sides of the weld which is considered to be impractical due to cost, additional radiation exposure and impact to plant equipment.
- 6. Proposed Alternative and Basis for Use The subject welds received a volumetric examination to the maximum extent practical utilizing the best available techniques, as qualified through the Performance Demonstration Initiative (PDI) for Supplement 2 with demonstrated best effort for single-sided examination from the accessible side of the weld.
Additionally, a visual (V-r-2) examination is performed at the end of each refuel outage during the system leakage tests as required by Section Xl, Table IWB-2500-1, Category B-P.
Based on the volumetric coverage that was obtained with acceptable results, and the visual (VT1-2) examination performed each refueling outage, it is reasonable to conclude that service induced degradation would be detected. Therefore, these proposed alternatives will provide an acceptable level of quality and safety by providing reasonable assurance of structural integrity of the subject welds.
- 7. Duration of Proposed Alternative Relief is requested for the fourth ten-year inspection interval for Millstone Power Station Unit 2, which began on April 1, 2010 and ends March 31, 2020.
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 8 of 13
.43 .43 .42 .42 .41 .41 ,43.49 .54 .55.54 .51 .52 .53 .54 .57 Pipe Tee
- Flow Required
(.1.6Exam
- .155Volume
=0.248") - 0.2334"
- z z_
Far Side Required Exam Volume -0 1.235,"
(0.8 * .1.55 =0.124") -_-z.
Volume Examined on Far Side - 0.094" (76.1I%)
(Best Effort)
Far~side exam volume limited for 10" due to tee configuration.
Limited area scanned with 2.25MHZ 700 for best effort coverage (Area dirnensidns determined with TurboCAD) 19)
Examination Volume Dimensions: Length 14.25". x Width 1.6" '"x Height +/-155" Weld Thickness=z .54" Weld Length= *14.25" Weld Width= .6" Coverage Summary- Weed # BPY-C-5019-A Required Scans- each has a weighing factor of 100% for complete coverage
__n____e Upstream-Axial Upstream- Circ. Downstream Axial Downstream Circ.
4601010%30% 100%
70 .......... 53.2% (best effort)
Code Coverage Total 82.5%
1110+100+30+100=330/4=82.5 Best Effort Coverage (Max 25%) Total 13.3%
Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination volume past the centerline that is examined in the axial beam direction with an Appendix Viii demonstrated procedure for single sided coverage
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 9 of 13
- ,* *:**" *T", * '*,* * ,* ,. ,>, 7, ,
1,16 1.16 1.12 .1.12 1.32 Fiow N
- -0.6298" Required Downstream side exam volume Downstream side volume examnined in limited area 0.1655" = 26.3%
Downstream side exam, volume limited :rotr 8" due to Weld Overlay.
Limited area scanned with 60°RL for best effort coverage (Area dimensions determined with TurboCAD 19)
Examination Volume Dimensions: Length 40.0" x Width 2.48" x Height .37"-
Weld Thickness= 1.12" Weld Length= 40.0" Weld width= 1.1" _..________
Coverage Summary- Weld # BSI-C-30}04 ___
Required Scans- each has a weighing factor of 100% for complete coverage Angle Upstream-Axial Upstream- Circ. Downstream Axial Downstream Circ.
45 100% 10o% 80%{80 60 RL . .. 5.26% (Best Effort) __________
___________________________ Code Coverage Total 90%
100÷100+80-÷80=360/4=90% Best Effort. Coverage (Max 25%) Total 1.3%
Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination Volume past the centerline that is examined in the axial beam direction with an Appendix VIII demonstrated procedure for single sided coverage___________ __________________
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 10 of 13
.45 .42 .45 NR 450 6O~ 70~
Valve V-252 Pipe Flow Examination Volume Dimensions: Length 11"_* x Width 1.5"._* x Height .15"_.*
Weld Thickness= .45" Weld Length= 11" Weld Width= .50" Coverage Summary- Weld # BPY-C-1063-A Required Scans- each has a weighing factor of 1[00% for complete coverage Angle ... Upstream-Axial Upstream- Circ. Downstream Axial Downstream Circ.
45/60 100% I 100% 0%. 0%
70 100%(Best Effort) __________
Code Coverage Total 50%
100O0+0O+0=OZ00/4=50% Best Effort Coverage (Max 25%) Total 25%
Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination volume past the centerline that is examined in the axial beam direction with an Appendix VIII demonstrated procedure for single sided coverage
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 11 of 13 NR. .45.417 .445 Valve V-2---
V700 600 450
- --,*// Pipe Flow Examination Volume Dimensions: Length 11" :11" Weld Thickness= .45"__* Weld Length= Weld Width= .50" Coverage Summary- Weld tt 8PY-C-1O65-A IRequired Scans- each has a wei~hin* factor of I100% fnr cnmnl~t* cnii~r~rn Angle Upstream-Axial Upstream- CIrc. Downstream Axial Downstream Circ.
45/60 0% 0% 100% 100%
__70 100%(Best Effort)
Code Coverage Total 50%
-1oO+1~o~o+o=*00/45so% Best Effort Coverage (Max 25%) Total I25%
Notes:
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination volume past the centerline that is examined in the axial beam direction with an Appendix VIII demonstrated procedure for single sided .coverage
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 12 of 13
.47 .43 .45 NR 450 60o 700
- -*Valve V-253 Flow Examination Volume Dimensions: Length 11* x Width 1.5"* x Height *jS" Weld Thickness= .45"._* WeldLength= Z&" WeldWidth= .50"_____
Coverage Summary- Weld # BPY-C-3070-A
_______Required Scans- each has a weighing factor-of 100% for conmplete coverage Angle Upstream-Axial Upstream- Circ. Downstream Axial Downstream Circ, 45/60 100% 100% 0% 0%
70 100%( Best Effort) __________
Code. Coverage/Total. 50%
1oo+1oo+o+o=4oo/4=so% Best Effort Coverage (Max 25%) Total 25%
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination volume past the centerline that is examined in the axial beam direction with an Appendix VIii demonstrated procedure for single sided coverage _______________________________
Serial No.15-309 Docket No. 50-336 Attachment 3, Page 13 of 13 NR .4.5.425 .456 FIo Examination Volume Dimensions: Length f1,_* x Width 1.5" *x Height .15" Weld Thickness= .45" Weld Length= 11"t! Weld Width} .50"_*
Coverage Summary- Weki # BPYo-Co3O72=A Required Scans- each has: a weigh~ing factor of 1t00%.for. complete coverage Angle Upstream-Axial Upstream- Circ. Downstream Axial Downstream.Cite.
45/60 0% ,0%. 100% 100%
70 100%(Best Effort)
SCode C:overage Total 50%
Notes: o+ozo+10+oo~ZOo/4i=5o% I Best Effort C:overage (Max 25%) Total J25%
- 1. Code Coverage refers to the maximum percentage of the required examination volume that is effectively examined with the qualified examination procedure
- 2. Best Effort Coverage refers to the required examination volume past the centerline that is examined in the axial beam direction with an Appendix VIII demonstrated procedure for single sided coverage