NG-17-0219, Closeout of the Fourth Ten-Year Inservice Inspection (ISI) Interval Relief Request No. NDE-R017
| ML17304B201 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 10/31/2017 |
| From: | Dean Curtland NextEra Energy Duane Arnold |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-17-0219 | |
| Download: ML17304B201 (38) | |
Text
NEXTera.
E N ERGY~
DUANE ARNOLD October 31, 2017 NG-17-0219 10 CFR 50.55a U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center Docket No. 50-331 Renewed Op. License No. DPR-49 Closeout of the Fourth Ten-Year lnservice Inspection (ISi) Interval Relief Request No. NDE-R017 In accordance with 10 CFR 50.55a(g)(5)(iii) , NextEra Energy Duane Arnold, LLC (NextEra Energy Duane Arnold) hereby requests approval of the attached Relief Request No. NDE-R017 as part of the closeout of the Fourth Ten-Year lnservice Inspection (ISi) Interval Program for the Duane Arnold Energy Center (DAEC).
The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, Rules for lnservice Inspection of Nuclear Power Plant Components,Section XI, 2001 Edition through the 2003 Addenda, as modified by 10 CFR 50.55a, is the code of record for the DAEC Fourth Ten-Year lnservice Inspection Interval.
Due to the configuration of the Reactor Vessel and RHR Heat Exchanger, it is impractical to meet the examination coverage requirements of the ASME Code,Section XI, 2001 Edition through the 2003 Addenda, as clarified by Code Case N-460 . Relief is requested in accordance with 10 CFR 50 .55a(g)(5)(iii). This relief, NDE-R017, is provided in the Enclosure to this letter.
NDE-R017 is requested on the basis of lnservice Inspection impracticality.
NextEra Energy Duane Arnold has determined that the examinations addressed in NDE-R017 were performed to the extent possible. As described in the Enclosure, the use of the proposed alternative examinations for this relief provides assurance of an acceptable level of quality and safety.
If you have any questions, please contact Michael Davis at (319) 851-7032.
NextEra En ergy Duane Arn old, LLC, 32 77 DAEC Ro ad, Palo, IA 52324
Document Control Desk NG-17-0219 Page 2 of 2 Dean Curtland Site Director, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC Enclosure cc: Administrator, Region Ill, USNRC Project Manager, DAEC, USNRC Senior Resident Inspector, DAEC, USNRC
Enclosure to NG-17-0219 Closeout of the Fourth Ten-Year lnservice Inspection (ISi) Interval Relief Request No. NDE-R017 35 pages follow
Page 1 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Relief Request In Accordance with 10 CFR50.55a(g)(5)(iii)
--lnservice Inspection Impracticality--
- 1. ASME Code Component(s) Affected Class 1 RPV Longitudinal Shell welds, RPV Closure Head-to-Flange weld, RPV Nozzle to Shell welds, RPV Lower Head Meridional welds and RPV Threads in Flange examination.
Class 2 RHR Heat Exchanger Nozzle to Shell weld.
2. Applicable Code Edition and Addenda
The Code of record for Duane Arnold Energy Center Unit 1 is the 2001 Edition through the 2003 Addenda of ASME Boiler and Pressure Vessel Code,Section XI, "Rules for lnservice Inspection of Nuclear Power Plant Components" as modified by 10CFR50, Section 50.55a.
The welds were examined with the latest techniques, procedures, equipment, and personnel qualified to the requirements of the Performance Demonstration Initiative (POI) Program, in accordance with the requirements of the ASME Code Section XI, 2001 Edition through the 2003 Addenda.
3. Applicable Code Requirement
Exam Item No. Examination Requirements Cat.
Essentially 100% volumetric examination of all longitudinal shell B-A 81.12 welds.
B-A 81.22 Essentially 100% volumetric examination of all meridional welds.
Essentially 100% volumetric examination of the head to flange B-A 81.40 weld.
Essentially 100% volumetric examination of the nozzle -to-shell B-D 83.90 weld.
Essentially 100% volumetric examination of the 1 inch annular B-G-1 86.40 surface of flange surrounding each stud hole.
Essentially 100% volumetric examination of the nozzle-to-shell C-B C2.21 weld NextEra Energy has invoked ASME Section XI Code Case N-460, which states: "when the entire examination volume or area cannot be examined due to interference by another component or part geometry, a reduction in examination coverage on any Class 1 or Class 2 weld may be
Page 2 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 accepted provided the reduction in coverage for that weld is less than 10%." Therefore, NextEra Energy is requesting relief only for those welds that were inspected and received Code coverage of 90% or less.
- 4. Impracticality of Compliance Due to the configuration of the Reactor Vessel and RHR Heat Exchanger, it is impractical to meet the examination coverage requirements of the ASME Code,Section XI, 2001 Edition through the 2003 Addenda, as clarified by Code Case N-460. Relief is requested in accordance with 10 CFR50 Section 50.55a(g)(5)(iii). These areas of examination limitations were identified during the 4th lnservice Inspection Interval.
When examined, the welds and component listed within this request did not receive the required code volume coverage due to their configuration and/or the presence of permanent attachments.
These scanning limitations prohibit essentially 100% ultrasonic examination coverage of the required examination volume; however all of the subject welds were examined to the extent possible.
Details of the examination limitations, including diagrams depicting the limitations, are as follows:
RPV Course 1 Vertical Welds (VLA-A001 and VLA-A002)
Examination Category 8-A, Item 81 .12 The mechanized scanning device used for the examination of the Course 1 Vertical Welds encountered physical obstructions from permanent component integral attachments and instrumentation supports as follows: Access to weld VLA-A001 was physically obstructed by the jet pump restraint bracket at elevation 229.5", the jet pump sensing brackets at elevations 161.5"
& 153.5" the jet pump sensing line brackets at elevation 112.25" and the jet pump support plate between the O degree and 90 degree azimuths. Access to weld VLA-A002 was physically obstructed by the jet pump restraint bracket at elevation 229.5", the jet pump sensing brackets at elevations 163.25" & 152.0" the jet pump sensing line brackets at elevation 102.5" and the jet pump support plate at approximately azimuth 270 degrees. Figures 1 through 10 provide detailed description and illustrations of the weld volume limitations due to jet pump restraint brackets, the jet pump sensing line brackets and the jet pump support plate.
The examination volume requirement depicted per Figure IWB-2500-2 volume is limited due to the proximity of the shroud support, Jet Pump restraint brackets and Jet Pump sensing brackets as described above. Access to 18% to 13.5%, respectively, of the examination volume is restricted and access to the outside surface is not possible due the Sacrificial Shield (Bio-shield) surrounding the Reactor Vessel. The remaining 82.01 % and 86.65%, respectively, of the examination volume was examined with techniques which have been qualified by demonstration in accordance with ASME Section XI, Appendix VIII, Supplements 4 and 6 of the ASME Section XI, 2001 Edition through the 2003 Addenda, using the Performance Demonstration Initiative Protocol. This weld was examined from both sides of the weld, in both parallel and perpendicular directions. The ultrasonic examinations revealed no indications in either weld.
Page 3 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 RPV Meridional Head Welds (HMA-8001, HMA-8002, HMA-8003, HMA-8004, HMA-8005, HMA-8006, HMA-8007, HMA-8008 and HMA-8009)
Examination Category 8-A, Item 81.22 Figures 11 through 12 illustrate the weld locations and the location of the areas of incomplete coverage. The examination volume requirement depicted per Figure IW8-2500-3 is limited due to the obstruction from the RPV skirt support and CRD penetrations.
RPV Head-to-Flange Weld (HCC-C001)
Examination Category B-A, Item 81 .40 The RPV head-to-flange weld HCC-C001 is examined from the head side only due to head-to-flange configuration. Figures 14 and 15 depict the scan limitations and the location of the areas of incomplete coverage.
This examination consisted of the weld circumference between stud holes 40 to 60 only. The examination volume requirement depicted per Figure IW8-2500-5 is limited to 76.05% due RPV head-to-flange configuration as this weld is examined in 113rd sections each ISi period.
The Nondestructive Examination (NOE) procedure used for this examination incorporates the examination techniques qualified under Appendix VIII of the ASME Section XI Code by the Performance Demonstration Initiative (POI). That procedure was approved under Relief Request NOE-ROOS on January 31, 2007.
RPV Nozzle-to-Shell Weld (FWD-DOOt LCA-0001, MSC-0001 and Vl8-D001)
Examination Category 8-0, Item 83.90 Figures 16 through 19 illustrate the scan limitations and the location of the areas of incomplete coverage of welds FWD-0001, LCA-0001, MSC-0001 and Vl8-D001. The examination volume requirement depicted per Figure IW8-2500-7(b) is limited to single side access due to the RPV nozzle-to-shell configuration.
RPV Threads in Flange (Ligaments (Stud Holes 1-60))
Examination Category 8-G-1, Item 86.40 The manual scanning of the 1 inch annulus surface around the RPV flange stud hole 1 through 60 is performed from the RPV flange surface. Figure 20 provides an illustration of the RPV flange surface limitation due to interference from a machined step on the flange surface where the 0-rings are seated. This causes a loss of contact for the 0-degree UT examination.
The examination volume depicted per Figure IW8-2500-12 is limited when scanning the carbon steel base material surrounding the stud holes due to a machined step which prohibits access to approximately 12.85% of the required examination volume. The accessible 87.15% of the examination volume was examined with ASME Code acceptable techniques. The ultrasonic examination did not reveal any recordable or reportable flaws in accordance with the ASME Code Section XI, 2001 Edition through the 2003 Addenda.
Page 4 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 RHR Nozzle-to-Shell Weld CHEA-CB-2)
Examination Category C-B, Item C2.21 The examination of Figure 21 shows the scan limitations and the location of the areas of incomplete coverage. The examination volume depicted per Figure IWC-2500-4(b) is limited due to interference from the adjacent shell to flange weld.
- 5. Burden Caused by Compliance It is not possible to obtain ultrasonic interrogation of greater than 90% of the required examination volume due to interferences caused by configuration, access restrictions and/or permanent attachments. All examinations were performed to the maximum extent possible. The ultrasonic (UT) techniques for each weld or surface were reviewed to determine if additional coverage could be achieved. For the welds or surfaces listed above, it was not possible to remove the obstruction without significant work, increased radiation exposure, and/or damage to the plant.
- 6. Proposed Alternative and Basis for Use Proposed Alternative
- 1) Periodic system pressure tests in accordance with ASME Section XI Category B-P, Table IWB-2500-1 and ASME Section XI Category C-H, Table IWC-2500-1.
- 2) Conduct ultrasonic examinations to the maximum extent possible.
NextEra Energy performed inservice examinations of selected welds and surfaces in accordance with the requirements of 10CFR50, Section 50.55a, plant Technical Specifications, and the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, 2001 Edition through the 2003 Addenda. When a component has conditions that limit the examination volume, NextEra Energy is required to submit the information to the enforcement and regulatory authorities having jurisdiction at the plant site. This Relief Request has been written to address areas where those types of conditions exist and the required amount of coverage was reduced below the minimum acceptable.
10 CFR50, Section50.55a(g)(4) recognizes that throughout the service life of a nuclear power facility, components which are classified as ASME Code Class 1, Class 2, and Class 3 must meet the requirements set forth in the ASME Code to the extent practical within the limitations of design, geometry and materials of construction of the components.
NextEra Energy performed the examinations to the extent possible. There is no plant-specific, NextEra fleet or industry operating experience regarding potential degradation specific to the subject welds included in this relief request.
In the unlikely event that a through wall flaw were to occur, Leakage monitoring inside containment at Duane Arnold unit 1 is provided by the reactor cavity (containment) sump
Page 5 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 monitoring system. This system has high level and alert status alarms in the control room. This system has Tech Spec required monitoring (TS 3.4.4.1) at least once every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
NextEra Energy performed ultrasonic examinations of the reactor vessel welds required to be examined in accordance with the requirements of 10 CFR50 Section 50.55a, plant Technical Specifications, and the ASME Section XI, 2001 Edition through the 2003 Addenda to the maximum extent possible. Additionally, the mechanized techniques employed for examination from the RPV inside surface have been demonstrated in accordance with Supplements 4 & 6 of the ASME Code Section XI, Appendix VIII, 1995 Edition through the 1996 Addenda, using the Performance Demonstration Initiative Protocol. The Ultrasonic (UT) techniques for each weld were reviewed to determine if additional coverage could be achieved for those areas limited from the inside surface. Access limitations due to permanently installed attachments inside the Reactor Vessel limited scanning of the welds included in this request for relief. Access for examination of the affected vertical welds from the outside of the reactor vessel is not possible due to the Sacrificial Shield (Bio-Shield). In addition to the required ultrasonic examinations, the interior of the Reactor Vessel, including welded attachments, received a visual examination in accordance with Table IWB-2500-1, Examination Categories B-N-1 and B-N-2. The VT-1 and VT-3 visual examinations revealed no relevant indications.
The subject welds were examined during the Fourth 10-year ISi Interval Reactor Vessel examination. No flaws were identified during the examination.
The extent of examination volume achieved ultrasonically and the system pressure tests provide assurance of an acceptable level of quality and safety.
- 7. Duration of Proposed Alternative This relief request is applicable to the Duane Arnold Unit 1 Fourth lnservice Inspection Interval which began November 1, 2006 and ended October 31, 2016.
- 8. References 10CFR50, Section 50.55a ASME Section XI, "Rules For lnservice Inspection of Nuclear Power Plant Components," 2001 Edition through the 2003 Addenda.
ASME Section XI, Division 1, Code Case N-460, "Alternative Examination Coverage for Class 1 and Class 2 Welds,Section XI, Division 1"
Page 6 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Coverage Credit Wave Mode Compliance Results Exam Material Course 1 Reactor Vessel 2014 Exam Category 8-A 45°RL & 1, lnservice examination Surface Vertical Item No. 81 .12 45°SHEAR 3, limited due to proximity examination is not Weld@54 VLA-A001 Fig. IW8-2500-2 4, of Jet Pump Support required by Code.
Degrees 5 % in. Thick 6, Plate, Jet Pump 146 1/8 in. Weld Length 7, Restrainer bracket &
82.01% 8, Sensing Line bracket.
SA533 Grade 8 9, Class 1 10 No Recordable Indications Course 1 Reactor Vessel 2014 Exam Category 8-A 45°RL & 2, lnservice examination Surface Vertical Item No. 81 .12 45°SHEAR 3, limited due to proximity examination is not Weld@234 VLA-A002 Fig. IW8-2500-2 5, of Jet Pump Support required by Code.
Degrees 5 % in, Thick 6, Plate, Jet Pump 146 1/8 in. Weld Length 7, Restrainer bracket &
86.65% 8, Sensing Line bracket.
SA533 Grade 8 9, Class 1 10 No Recordable Indications
Page 7 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination Configuration of Requirement and Angle and Fig.
Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 11, lnservice examination Surface Head Item No. B1 .22 12 limited due to RPV skirt examination is not Meridional HMA-B001 Fig. IWB-2500-3 support obstruction in required by Code.
Weld@30 6 ?/8th in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area (46.5" Class 1 of 54" total weld length)
No Recordable Indications Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 11, lnservice examination Surface Head Item No. 81.22 12 limited due to RPV skirt examination is not Meridional HMA-B002 Fig. IWB-2500-3 support obstruction in required by Code.
Weld@90 6 ?/8th in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area Class 1 No Recordable Indications
Page 8 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 11, lnservice examination Surface Head Item No. B1 .22 12 limited due to RPV skirt examination is not Meridional HMA-B003 Fig. IWB-2500-3 support obstruction in required by Code.
Weld@ 150 6 7/81h in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area Class 1 No Recordable Indications Bottom Reactor Vessel 2014 Exam Category 8-A 60°RL 11, lnservice examination Surface Head Item No. B1 .22 12 limited due to RPV skirt examination is not Meridional HMA-B004 Fig. IWB-2500-3 support obstruction in required by Code.
Weld @210 6 7/81h in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area Class 1 No Recordable Indications
Page 9 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 11, lnservice examination Surface Head Item No. B1.22 12 limited due to RPV skirt examination is not Meridional HMA-B005 Fig. IWB-2500-3 support obstruction in required by Code.
Weld@270 6 7/81h in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area Class 1 No Recordable Indications Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 11, lnservice examination Surface Head Item No. B1 .22 12 limited due to RPV skirt examination is not Meridional HMA-B006 Fig. IWB-2500-3 support obstruction in required by Code.
Weld @330 6 7/81h in. Thick required scanning area.
Degrees 46.5 in Weld Length Examined 100% of 80.3% required volume in SA533 Grade B accessible area Class 1 No Recordable Indications
Page 10 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 13 lnservice examination Surface Head Dollar Item No. B1.22 limited due to CRD examination is not Vertical HMA-B007 Fig. IWB-2500-3 penetrations in Bottom required by Code.
Weld 6 7/8th in. Thick Head. Examined 100%
45.0 in Weld Length of required volume in 66% accessible area (30" of SA533 Grade B 45" total weld length)
Class 1 No Recordable Indications Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 13 lnservice examination Head Dollar Item No. B 1.22 limited due to CRD Surface Vertical HMA-B008 Fig. IWB-2500-3 penetration in Bottom examination is not Weld 6 7/8th in. Thick Head. Examined 100% required by Code.
138.0 in Weld Length of required volume in 43.47% accessible area (60" of SA533 Grade B 138" total weld length)
Class 1 No Recordable Indications
Page 11 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination Configuration of Requirement and Angle and Fig.
Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Bottom Reactor Vessel 2014 Exam Category B-A 60°RL 13 lnservice examination Head Dollar Item No. B 1.22 limited due to CRD Surface Vertical HMA-B009 Fig. IWB-2500-3 penetration in Bottom examination is not Weld 6 7/81h in. Thick Head. Examined 100% required by Code.
127.0 in Weld Length of required volume in 47% accessible area (60" of SA533 Grade B 127" total weld length)
Class 1 No Recordable Indications Head To Reactor Vessel 2014 Exam Category B-A 60°RL 14, lnservice examination Magnetic Particle Flange Item No. B 1.40 15 limited to due to RPV examination Weld- HCC-C001 Fig. IWB-2500-5 Top Head flange performed obtaining (Stud Holes 6 7/81h in. Thick configuration -Single 100% coverage. No 40 Through side exam. recordable
- 60) SA533 Grade B 76.05% indications.
Class 1 No Recordable Indications
Page 12 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Reactor Feedwater 2014 Exam Category 8-D 40° & 45° 16 lnservice examination Surface Nozzle-To- Item No. 83.90 SHEAR; limited due to RPV examination is not Vessel Weld FWD-D001 Fig. IWB-2500-7 60°RL Nozzle-to-vessel required by Code.
411/16 in. Thick configuration - Single 28 5/8 in. OD side exam 87.67%
SA533 Grade 8 Class 1 No Recordable SA508 Class 2 Indications Reactor Standby Liquid Control 2014 Exam Category 8-D 40° & 45° 17 lnservice examination Surface Nozzle-To- Item No. 83.90 SHEAR; limited due to RPV examination is not Vessel Weld LCA-D001 Fig. IW8-2500-7 60°RL Nozzle-to-vessel required by Code.
5 % in. Thick configuration and RPV 13 % in. OD Support Skirt - Single 63.71% side exam SA533 Grade 8 Class 1 SA508 Class 2 No Recordable Indications
Page 13 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Reactor Main Steam 2014 Exam Category 8-D 40° & 45° 18 lnservice examination Surface Nozzle-To- Item No. 83.90 SHEAR; limited due to RPV examination is not Vessel Weld MSC-D001 Fig. IW8-2500-7 60°RL Nozzle-to-vessel required by Code.
5 % in. Thick configuration - Single 38 in. OD side exam 79.38%
SA533 Grade 8 Class 1 No Recordable SA508 Class 2 Indications Reactor Vessel Instrumentation 2014 Exam Category 8-D 40° & 45° 19 lnservice examination Surface Nozzle-To- Item No. 83.90 SHEAR; limited due to RPV examination is not Vessel Weld Vl8-D001 Fig. IW8-2500-7 60°RL Nozzle-to-vessel required by Code.
4 11/16 in. Thick configuration - Single 13 % in. OD side exam 82.4%
SA533 Grade 8 Class 1 No Recordable SA508 Class 2 Indications
Page 14 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 System Year Applicable Code Examination System Component ID Impracticality of Surface Examination of Requirement and Angle and Fig.
Configuration Diameter-Schedule Compliance Results Exam Coverage Credit Wave Mode Material Ligaments Reactor Vessel 2014 Exam Category B-G-1 0°L 20 lnservice examination Surface Studs 1 - Item No. 86.40 limited to due to RPV examination is not 60 CLSR HD-LGMNTS Fig. IWB-2500-12 Flange configuration required by Code.
(Threads-In-Flange) 6 in. Diameter No Recordable 87.15% Indications SA508 Class 2 Nozzle-To- "A" RHR Heat Exam Category C-B 21 lnservice examination Magnetic Particle Vessel Weld Exchanger 2014 Item No. C2.21 70° & 45° limited due to nozzle to examination Fig. IWC-2500-3(a) SHEAR shell configuration and performed obtaining HEA-CB-2 also physical 100% coverage. No 1 in. Thick obstruction from the recordable 16 in. ID 71% adjacent shell to flange indications.
weld from 19" to 34" of SA516 Grade 70 the weld circumference.
No Recordable Indications
Page 15 of 35 DUANE ARNOLD UN IT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 VLAA 1 LI MITATI ONS VLAA 1 & VLAA2 LI MITATI ONS REACTOR VESS EL VLAA 1 & VLAA2 SCANN ING LI MITATI ON AT UNDERS IDE OF J ET PUM P BRACK ETS SHRO UD J ET PUMP VLAA 1 & VLAA2 SCANN ING LI MITATI ON DU E TO SENS ING LI NE BRACK ETS ON J ET PUM PS l 1 53.5~ ELEVATION
'! ! I \
f-*~ ~--~
- I I I I I I I VLAA 1 & VLAA2 LI MITATI ON
' i 12.25" ELEVATI ON DU E TO CABLE INTERFERENC E
! ! ! 'NITH SENSING LI NE BRACK ETS
~L
~n t::~n1s" t::d ~~
--~~~~~ '-T-:Z:::z:z? :::Z:::Z-~ J ET PUMP o* 90" SUPPORT PLATE Figure 1 - VLA-A001
Page 16 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Li mited Exam Relief Request NDE-R017 VLAA2 LI M ITATI ON S VLAA 1 & VLAA2 LI MITATI ONS E4~P u REACTOR VESSEL i[i II JL IZl'.:...!t!. ~
VLAA 1 & VLAA2 SCANNING LI MITATION AT UNDERS IDE OF JET PUMP BRACKETS SHROU D 229.5 ..
JET PUMP VLAA 1 & VLAA2 SCANNING LI MIT.A.TION DUE TO SENSING LI NE BRACKETS ON JET PUM PS VLAA 1 & VLAA2 LI MIT.A.TION DU E TO CABLE INTER FER ENCE WITH SENSING LI NE BRACK ETS J ET PUM P SUPPORT PLATE Figure 2 - VLA-A002
Page 17 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 The following pages are the Limitations explanation for VLA-A001 and VLA-A002:
The limitations at the top of the inspection area were due to the horizontal scan rail contacting the underside of the jet pump restraint brackets. See Figure 8 (VS-11-01 & VS-11-02)
- The limitations in the middle area of the weld were due to a bracket mounted to the jet pump. These brackets are installed in the field to secure the sensing lines along the side of the jet pump; the orientation limited the scanner travelling vertically. See Figure 9 (VS-11-06)
- The limitations at the bottom of the welds were due to the sensing lines and brackets installed at the bottom of the jet pumps as well as the Jet Pump support plate. The brackets and sensing lines interfered with the cables on the rear of the scanner preventing full travel. See Figure 10 (VS-11-07<1 > & VS-11-07<2>)
Figure 3 - VLA-A001 and VLA-A002
Page 18 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 WesDyne International Reactor Vessel Weld ResuJts Summary Duane Arnold Energy Center . DIRECTION !ORIENTATION DUANE ARNOLD ENERGY CENTER UNIT 1 RPV COVERAGE ESTIMATE BREAKDOWNS PARALLa SCANS UPIDOWN PERP. SCANS CCVI/ I CW WELD NO. VLA-Al DESCRIF'I'ION 1" Course Long. Wdd 54° WELD DESCRIPTION 1ST Course Long Seam Weld @54* WELD NO. VLA-A1 WesDyne# W8 BEAM ANGLES LIMITATIONS NOD YES~ 82.01%
BEAM 45°LDual 4$0 L 45° Shear TOTAL%
UT RESULTS NI RI NO.OF UT INDICATIONS _ _ 0 DIRECTION
~ D STATUS NIA WBGHTED EXAM WEIGHTED EXAM WEIGHTED EXAM EXAM VOLUME va.UME (47.62%) VQ.UME~2.3811) VCILUME(40.o%)
CCW/CW 38.53 8.98 32.29 79.80 EXAM DOCUMENTATION INDICATION DOCUMENTATION
( j ASSESSMENT SHEET UP/DOWN 37.47 10.19 36.56 84.23
@ANALYSIS LOG L.....J
@ACQUISITION LOG D PARAGON HARD COPY
@SCAN PRINTOUT D OTHER ( specify)
COMBIMED UT COVERAGE=
@COVERAGE BREAKDOWN See exam volume EPP sketch shaat 11 of 11 82.01%
Limitaliom: Jet Pump Support Plate-Jet Pump Restrainer Bracket- Sensing Line Bracket Data quality verified as required by procedure.
WESDYNEANALYST: C.S. Wyffels (1,,(i/J---=
I Level: Ill Date: 10/18/14 ANALYST: C.S.Wy!Tels ~A vt--
I Level: ID Date: 10/18(14 Figure 4 - VLA-A001
Page 19 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 WesDyne International Reactor Vessei Weld Results Smnmary Duane Arnold Energy Center DIRECTION I ORIENTATION DUANE ARNOLD ENERGY CENTER UNIT 1 RPV COVERAGE ESTIMATE BREAKDOWNS PARALLEL SCANS UP/DOWN PERP. SCANS CCW I CW WELD NO. VLA-A2 DESCRIPTION I" Coarse Long. Weld@234" waD ST DESCRIPTION 1 Course Long Seam Weld @234* WELD NO. VLA-"2 WesDyne# W9 BEAM ANGLES LIMITATIONS NOD YES [!) 86.65"/o BEAM 45" LDual 45° L 45° Shear TOTAL%
UT RESULTS NI RI NO--:C:W UT INDICATIONS _ _ o DIRECTION
~ D STATUS NIA WEIGliTEO EXAM VOWME (47.62%)
WEIGHTED EXAM VOWME (12.3811)
WSGHTED EXAM VOLUME l*0.0%)
EXAM VOLUME EXAM DOCUMENTATION INDICATION DOCUMENTATION CCW/CW 40.73 9.55 I 34.14 84.42
[RI ANALYSIS LOG D ASSESSMENT SHEET UP/DOWN 39.69 10.n 38.42 88.87
[Rj ACQUISffiON LOG D PARAGON HARD COPY (R] SCAN PRINTOUT D OTHER ( ~ify)
COMBIMED UT COVERAGE=
[RI COVERAGE BREAKDOWN See exam volume EPPsketchlhaat11 of11 86.65%
Data quality verified as required by procedure. Limitations: Jet Pump Support Plate-Jet Pump Restrainer Bracket- Sensing Line Bracket
" WESDYNE ANALYST: C. S. Wyffels J---
t'./-tf Level: III Date: 10/19/14 1
ANALYST: C.S.Wytfels e,J~ Level: ID Date: 10/19/14 Figure 5 - VLA-A002
Page 20 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 1>1 Course Longitudinal Welds Vl.A-A J {W8) and Vl.A-A2 CW9)
The Ijl course longitudinal welds are limited in examination coverage due to the proximity of the jet pump support plate: jet pump restrainer bracket and sensing line bracket. Scanning was conducted adjacent to the obstructing lugs with the scan boundaries maximized by visually assisted positioning of the exam sled. Coverage was achieved to the maximum extent practical by using solid modeling to design the robot scan routines around the limitations. Extra transducers were also added to the exam sled to maximize coverage. Final examination cowrngc achieved is 82.01% and 86.6% respect1vd~
(Ref. EPP technique drawing sheet J I of l 1).
Jet Pump Restrainer Bracket - 238"' to 228.. in vessel elevation for t:ach weld.
Sensing Line Bracket - 161" to J52" in v~ssd dc\ation for each weld.
Jet Pump Support Plate - 112., to 92.5 in vessel elevation for each weld.
Figure 6 - VLA-A001 and VLA-A002
Page 21 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 465.88 ~
3.70' Perp. Seen Stop 3.$3" Par. Index Stop VLA-Al (WB) @ 54*
VLA-A2 (W9) @ 234' 3.8S Per. lndex Start 3.70' Perp. Scan Start
.19 (NOM.)
R92.50 SCAN INCREMENTS PAR. - 0.31" <0.5')
PERP - o.s*
DUANE ARNOLD s12.oo ~I 2014 EXAMINATION PROGRAM PLAN
'I---..... fE.14.51 Bottom Par. Rev. 1 I "'--1:)14.89 Bottom Perp.
FIRST COURSE LONG SEAMS 92.50 I VE:SDYNE: I .:.-=.-:.1SH££T u er al Figure 7 - VLA-A001 and VLA-A002
[0/24/00 REVISED 110,I CESCRIPTIQ" SILL OF HPn. P~OCED.
9/24/07 REVISED
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Page 24 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 il NO. OE SCR!PTI~ I BILL CF MATL. I PROCEil.
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n Reactor Pressure Vessel Sketch OWG. NO . REV.
VS 07< 1> 2 Figure 10 - VLA-A001 and VLA-A002
Page 25 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Typical HMA-BOOX meridional c:5 welds
~
RPV Support Skirt obstructing meridional welds I,~
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Figure 11 - HMA-8001 , HMA-8002, HMA-8003, HMA-8004, HMA-8005, HMA-8006 (MERIDIONAL WELDS)
Page 26 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017
~*
0 ,. ... < I ' .- * ** * :
Examination Coverages code cross actual %of code weld length weld length Percent Percent Weld Length sectional area area scanned scanned scanned scanned 57.90 area scanned scanned auto manual auto manual (in.} (sq. in.) (sq. in.) on.) (in.)
60° T-scan 64.5 64.5 100 0 46.5 0 80.31 60° P-scan CW 64.5 64.5 100 0 46.5 0 80.31 so* P-scan ccw 64.5 64.5 100 0 46.5 0 80.31 100.0 0.0 80.3 Total Code Coverage Percert.age I 8()_.~%J "51f.P: ..
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Figure 12 - HMA-8001, HMA-8002, HMA-8003, HMA-8004, HMA-8005, HMA-8006 (Typical Coverage)
Page 27 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 CHMA-86>
<H10-lll
!H! l-l l>
<Hl 2-lll CH1 0-ll1l> ~
(Hll-101 HMA-8007 - 30" of 45" total weld length= 66%,
CH12- 10l HMA-8008 - 60" of 138" total weld length = 43.47%
HMA-8009 - 60" of 127" total weld length = 47%
PLAN IES: BOTTOM HEAD Inservice Inspection Program ASSEMBLY Figure 13 - BOTTOM HEAD ASSEMBLY (Welds HMA-8007, HMA-8008 & HMA-8009)
Page 28 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 ci SE E VS - 0J - 3q<2>
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APE0 - 811*2G55 - 2 l5 OP HEAD Fi g 1.Jre No . Ll ~ 05 AS SEMBLY t *G . NO. V S 06 IR;+'*
Figure 14 - HCC-C001 (3rd Period - 1/3rd of Vessel Ligament Exam Location)
Page 29 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 BPV Con!'l!M ~ICUIJ!lfon Sheet HCC-COOl Coverage plot- Parallel scan direction
-\
Hole: calallallons performed using 20 plat only Cornpon&nt ID Ii~
Area reaUire-d to be -eoumlned Aldal """'" dlnteUon: H<tlght x wilclth
~lnches x ___!:!_inches equals ~11q1.1:are Inc:"-
Parnllol sc::ifl cllrec:tlon: HelghU: wldUI
~lndl..s x ._..!:!._Inches equals ~ squan lnehes Head Tolal llr'O& roqulroel to bee ex:i*mlnod ~ sqmftl lni:hes mqulttel for c:ornpfote OJC:lm I Coverage plot- Axial scan direction 60dcg.
Aa>il ,.,.,, &:amrw 60 degl"l!e R.L Ax:lsl 11can diractfon: Ho-lght x wldUt
_!:.!!!__ lnch..s x __!Llncltn crqual11 ~~quarelnc:he$
Trluigular :mta not axamlnad (if applies) 1.53 x.IS J: _..!:!!,_ hlllgflt equals ~ sqmnt lnchn
-ea;;;-
Aldal scan dfnte:llon area c>asmlned ~$quore inchn ocovcragc GO degrao R.L. Par:allsl scan Cll1'1!ctlon: Helghl x width Head
~Inches x ~Inches 11quala. ...E:!!!!!..i;quam lndl<ls cn~-t..: r ( r r (.f)
Addlliomil Inner 15% area achlOYOd ming 40 .& .is degt11<t sh1tar ~tmlqumo: Helg:ht x width (Nozzlct to RPV only)
An:a of covcrngc
_ _ _o_lnc:hMJ x __r>__ lnc:hes equals __o__ SCIU*nl lnchn Salc2:1 Combining .. 11 acan cllrec:tlon1': ~sqmnt ]nett.ta. rcrtctal ...um D!Ykl<t .,_,. """"'inctd by requlntd ""'": eq1121s e>oYC!f2S<t "chle¥CICI ...!!:.!!!.. % cover.age for total exam
- oCO\lerage Calcubrllcns p<tdormed by: Todd B'Je.chlnsCl'r- l.(Mol _11_1- -
DAECRevl- Empk Pohmen l"""I Ill CCIJ * / ** .,_,,. '(1) Flange ANll Rrrilrw Sctle2:1 Figure 15 - HCC-C001 (3rd Period -1/3rd of Vessel Ligament Exam Coverage (76.05%)
Page 30 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Examim::d:!A".$.. ""':=e.
Area reg111recl to be ~xami!!ecl Axial scan direction Review;::_~_&_, _j;l'.,.,_'1,.,1'<
', Report #--r,,.;<i1- ___ _
Page-- of. __ _
A:w:ial scan direction: *'leighhwidth --. A 60 deg.
""::'---:!, :I-,~--'-;"'" ;v~----
6.25 iM:he'S x
-2:.86 mclles equals.
-15.1>15 square incm - -~- ~. ~<:/;
t
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Paral~I :seao tJirec1ion: Hei;M x vncUl'l
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/
/ t'x/*>¢,., .. <'l""'" Arc-a: Of COYCr:lS,C
<~l£:~1--
6.26 l.nci1e$ x ~i11ches equals ~square inch!!-!
T01al "'ro.a Nqulrec! to be examiJT>ed ~square i11ches requfred for complete enm 60_,.,,,...*deg.
,....,.-..,.-""--~
i *. ~-. ,-:>,;_ ... _K.<-.~ /
Actual area examined f*.'?~f;~<~*~~
/
G~ ~ree R.L Axial scan directilm: Height lt vnl1tll / f*:/,*c;>;*. *. <.<.>\-*;:x,x; /
5.26 Inc.hes x -1!,L inr:hc:s cqlr;'Jls ~ sciuare inches -- HQ~,~(?::~~~i~~~~-~~-:~--------==----
Tti<ingulat are.a not l!'xamil\£'d (if appliesl Axial sean direction area examiaed
-o.ss 11.2 b;iSQ
~ sqooro (ne00s ll: ~height equall> ~ squ;m1 i11chos \
Parallel scan direction Examine:rr.:::: ;,,:g.:__~_,
Rcvic'\.v ___ r";......(i~~-:l~l*".~---
-,., R.:c:port #-_:;i:CS".o"~-
SO de9!'0e- R.L. Pariltel stan direction; ttelght x widtl1
.............., Pagc - -- of--
---~----- ~ :0
~in1:h1111 111q11als ~:sq~arvincbvs -"1.:;:.1..---~~~;;~;:." '-- -
s.2:5 inches x
~.?'.Y.,>'<"V"v".J'./'.,):°"' -,.:,,,*
-*-;t,..x..:">.:...,. -~-KY. **, '-./,
AddttioMI Inner 15% ama ael!fevecl llSing 411 & 4S oogl'il!'O s~nr tochrilquos:: ltlt~At 1C width No :eove:rn,ge I :..-*--t..:*:"'>-S6t:--:-"//¢.<-
t-:":~<...-:_Y ....:/1. .,/ *,,. .. ~:_
- ,0.:;r.:,.::~:... ,,.,-<...,>-. !ol"..,;>~_;.r:Vy>/
w..,~~:X:.YX ~ _.. .,....._~/)-~">~/,"'
- n.7875 Inciles x !:!.: Inches equals
-0...5985 :square inches '-, ~v.).: *~_,-.>x*::.1-~
- .,.x.~v~...(.J<~&
- ;.::;*.x
~--.... .t <>:.
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--'-"'*l uf '"'-""'1:1!."
Combln 1119 all scan 'l!irectlons: 26.3284 $Ql.lllre lrwhes ie>r total eitam
~:)*X>:>:"'.<?/'. .,"...(. ,.,*
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01\rlllfe arem ax.a mined by nq111lrad ar1r<1: ~qu;lls coV111mgc ai::bicv11d 87,67 % covef*ge f-or total e:ic.am ?'/ >:~>=".:*~r_..~(~~?~~
,_,.,._"'-.-: J: >* /'./. ;.:
Figure 16 - FWD-0001
- ___ __]'.!_
(.~
---.----*------- ~
Page 31 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Nm::zle ID
-N10
\DAEC Nl 0 Coverage Plot Area mutnd to bj!gamlned
\, Axial scan direction Axial scan dinH:lion: Height x widlh 6.26 inches x 3.007 inches equals -1!:!!!!.square Inches
~~~t~~-.~~f~~~~~~~
Paralllri scan <Jlrec.tlon: Height x wiiftff 5.26 incfles x ~inches equals ..:!!:!!.!!.square inches Nocov=~~-ILI ifiA ,J ~'!<'"'"'"
- ~*:.-:.::*r:;~-:~~::::T>-~~ 60 deg.
j\~.~-~4:4 // //
Tolal area requlitd to !be examined 31.5736 square inches requlted fer complete cum Ac!ll!al area examined
,x~~;* -~:::".~:~~;.->~.. /
~Ju.; AiTar:scan direc.tlon: Helght x width i;<~p::~~:f~~2~*:\.'\::<~~::i /
us lnchoo x ~ilnches equals ~square inches
- ~
- t
- :{M~~~~:}~/
H G F Triangular area not examined (if applP8s} 1.37 112 base x !::!!__ hai;ht equals ..!:!!!!!. ill!CIW!e lnch0$ I
\ DAEC Nl 0 Coverage Plot Percenlige of weld length examined in axial direction 62 %
\,., Parallell scan direction Axlal scan dll'l!Ctian area. examined .!:!!!!!. squara ~
SO degree R.L Parallel scan direct!On: Haight x width 5.26 inches x -1:!!._. indmi equals ~square tnche:s No coverage---------
Atkfdlonal Inner 15% area achiie'led using 46 degree shear technique: Height x width l I
0.7875 inches x -1:.!!__ lncfles equals ~square Inches Combining all scan directions: ~square Inch" for tolll eom I
I Divide area examined lby rnquired area~. equals covmge acflieved 63.71 % coverage for total exam Inner 15% cover.ngl_
'* -L_.-
r ._ . . :z::. . _). .;-.-~ . . . . . *<_--; *1--_:*. '-;:~
Figure 17 - LCA-0001 H G
Page 32 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017
\
NozzlelO .N3...... . \\ DAEC N3 Coverage Plot Parallel scan direction Am required to Pe examineid A B c Axf~ !llean ~i~c~ _Height x wkltb
.. _~inches x ..2;!!!!_ ;nclles equals .?!:!!!!!.!llquare lnCIU!S No coverage Parallel scan direction: Height x width
~
6.25 inches x 3.007 inef\ies equals 15.7888 square Inches l*otal area requllred to bt examlMd 31.5735 $qlll!l'e inches required fOr complela mcam Ad~
60 degree R.L Axial scan direction: Height x width 6.26 Inches x Triangular area ~ot eumlned l~f ~lllSI
_}.007 inches equals 15.7868 square indtes
__!;!!_112 lme x __!!!_height equals _!:!!!!.square inches G
DAEC N3 Coverage Plot Axial scan direction E
Axial san dlreclion area exarn1nce1 ~squarelnches 60 degree R.L. Parallel scan direetion:_H_~Jght x Widlh 5.25 inches x -1:!!!_ inches equals ....!:!!!....square 1ncnes No coverage Addltlonal Inner 15% area ac~eved using 40 &4$ degree ihear techniques: Heightx Widlfl 0.7875 inches x .....:!:!!.... inches equals ~square inches
_______ Area of cov
,_~-----
<A'V'
- crage Combining all scan directions: 1!:!!1 ~are *nches for total exam l?fvlde area *exa"'!1ned by required a'!a.:. __ . ~Ills coverage achieved ~%coverage for total exam
~:. . /Odeg.
,~
Figure 18 - MSC-0001 H G
Page 33 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Hozzlit rD NUB Area '!911ilirod to tm lfi'i'1ml"'11CI Axial scan dimc;Uon: Hai!rht x widfu
- fi.25 Inches Paralfol u:an dinetlcn: Hiolght x width x 2.859 Inches equ;al:s. ~square Inches 5.20 ltlcl'les x ~Inches equals ~ *qu;rv Inc~
Toti.I ilRa remiinrd' lo bl.' 'U:lmlll'ecl ~ aquuv lncbes nqulmd f'or complete eum
/60o decr Actual ll'!'!tii! gumlM!!!
/,/'/
SO degroo R. L. Axial s;i;an cll,l'l'ction; Ko-lght x wlid'lh
_EL lnchns x ....!:!!!__ lnt~lt& ctqlilllls ~ tiqua,n: finches H F Triangular a.roa net mx.amloocl 11r appllies) ~ 1.ll bue x ~height equals 1.42975 square Inches '1
\ DAEC Nl 1 Coverage Plot Axial scari dlmctlon al'l!a eumlood ~ :squ1re Inches
- '\,,_. Parallel scan direction 60 degM R.L P.'inllel sc:m direction: Height :i: width A
~---*;:;* t_;:;;,~~-.-,.--_-f;i~*~------
15.25 ln<:he$ x ...?:!_fn1:lhll$ ociuar.s ~ squ:i:re in-c.hes Addltlon.nf Inner 115% anH1 ac:hi!MMI using -45 dill:!lrlHI! s h!Jar ledinf\que: Hoighl x width 0.71115 Inches x __!:.L_ iru:hu eqJ.111111 ~ squam int:htl:!I ----
A:-c:aof"~o~c Comblnlng a!l sc:11n diTileUons: ~ oqlJll.l'(l lnehe:!l ror tolal *Xllm Divide a:re:a ex11minttd by req;ulred area: eqt;tlll' covense :tchle't'ed __!!!:.!_ % cove,rage for totaS exam
/ l~~>
Figure 19 - VIB-0001 Jnner 15% CD.~i~~(~,;sz~_\
A- H
~~:~&Z:>>:~?'.:':(.~~~*D..a G F E.L>----- - - - - - - -
F.
Page 34 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Drawing Not to Scale Drawing is representative of a.II ligament areas{Studs 1-60)
Area of Inadequate Probe Conlact 2.57" -' .-*
Exam Area(Bushing + 1")
Flange Surface Stud & 20.0" Circumference Bushing Total scanning circumference= 20,0" Scanned circumference= 17.43"'
Unscanned circumference due to Flange configuration= 2.57" Coverage Calculatioin 2.57 l 20:::: 0.1285 0.1285 x 100 = 12.85'%i (Unscanned Area)
=
100 .~ 12.85 87.15% (Coverage Obtained)
Figure 20 - Reactor Stud Ligament Exam
Page 35 of 35 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017
~i~1~ri~G!~'.~' . "'
~ ~;,.- ;:*~:.~~
~t.1 /'Jo"L1't..lf
.,,_ .if:S 10* .,,. ,
....~~; *{*
- _~
rfJ.J~.rn~0fi;:1;~~;1i~~j~w~~w~#ii;i'~;~ ~*-* *:; , ~* . :~:,......;
. J~~;.:
- ~ ..
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- " :-:;;\
Remarks: One sidei:::I exam vvas performed frorn sr1ell side due to nozzle to shell configuration. Exam l!vas limlted from 19" to 24" and from 29" to 34" due to '1l<J'" dimerrsrons of less than 2 due to weicl H E.1~~Cl\~ 1. e.xam from 24" to* 29" due w 1,veld HEA~CA-1. 71 ~/Q 1
Figure 21 - HEA-CB-2