NG-17-0219, Closeout of the Fourth Ten-Year Inservice Inspection (ISI) Interval Relief Request No. NDE-R017

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 EN ERGY~

October 31, 2017 DUANE ARNOLD 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 Energy Duane Arnold, LLC, 3277 DAEC Road, 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

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--

Page 1 of 35

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 1 OCFR50, 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.

B-A 81.12 Essentially 100% volumetric examination of all longitudinal shell welds.

B-A 81.22 Essentially 100% volumetric examination of all meridional welds.

B-A 81.40 Essentially 100% volumetric examination of the head to flange weld.

B-D 83.90 Essentially 100% volumetric examination of the nozzle -to-shell weld.

B-G-1 86.40 Essentially 100% volumetric examination of the 1 inch annular surface of flange surrounding each stud hole.

C-B C2.21 Essentially 100% volumetric examination of the nozzle-to-shell 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

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 2 of 35 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.

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 3 of 35 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.

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 Page 4 of 35 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

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 5 of 35 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 1 OCFR50, 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"

System System Component ID Configuration Diameter-Schedule Material Course 1 Reactor Vessel Vertical Weld@54 VLA-A001 Degrees 5 % in. Thick 146 1/8 in. Weld Length SA533 Grade 8 Class 1 Course 1 Reactor Vessel Vertical Weld@234 VLA-A002 Degrees 5 % in, Thick 146 1/8 in. Weld Length SA533 Grade 8 Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category 8-A 45°RL &

1, lnservice examination Item No. 81.12 45°SHEAR 3,

limited due to proximity Fig. IW8-2500-2 4,

of Jet Pump Support 6,

Plate, Jet Pump 7,

Restrainer bracket &

82.01%

8, Sensing Line bracket.

9, 10 No Recordable Indications 2014 Exam Category 8-A 45°RL &

2, lnservice examination Item No. 81.12 45°SHEAR 3,

limited due to proximity Fig. IW8-2500-2 5,

of Jet Pump Support 6,

Plate, Jet Pump 7,

Restrainer bracket &

86.65%

8, Sensing Line bracket.

9, 10 No Recordable Indications Page 6 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Bottom Reactor Vessel Head Meridional HMA-B001 Weld@30 6 ?/8th in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 Bottom Reactor Vessel Head Meridional HMA-B002 Weld@90 6 ?/8th in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-A 60°RL 11, lnservice examination Item No. B1.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area (46.5" of 54" total weld length)

No Recordable Indications 2014 Exam Category B-A 60°RL 11, lnservice examination Item No. 81.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area No Recordable Indications Page 7 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Bottom Reactor Vessel Head Meridional HMA-B003 Weld@ 150 6 7/81h in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 Bottom Reactor Vessel Head Meridional HMA-B004 Weld @210 6 7/81h in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-A 60°RL 11, lnservice examination Item No. B1.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area No Recordable Indications 2014 Exam Category 8-A 60°RL 11, lnservice examination Item No. B1.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area No Recordable Indications Page 8 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Bottom Reactor Vessel Head Meridional HMA-B005 Weld@270 6 7/81h in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 Bottom Reactor Vessel Head Meridional HMA-B006 Weld @330 6 7/81h in. Thick Degrees 46.5 in Weld Length SA533 Grade B Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-A 60°RL 11, lnservice examination Item No. B1.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area No Recordable Indications 2014 Exam Category B-A 60°RL 11, lnservice examination Item No. B1.22 12 limited due to RPV skirt Fig. IWB-2500-3 support obstruction in required scanning area.

Examined 100% of 80.3%

required volume in accessible area No Recordable Indications Page 9 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Bottom Reactor Vessel Head Dollar Vertical HMA-B007 Weld 6 7/8th in. Thick 45.0 in Weld Length SA533 Grade B Class 1 Bottom Reactor Vessel Head Dollar Vertical HMA-B008 Weld 6 7/8th in. Thick 138.0 in Weld Length SA533 Grade B Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-A 60°RL 13 lnservice examination Item No. B1.22 limited due to CRD Fig. IWB-2500-3 penetrations in Bottom Head. Examined 100%

of required volume in 66%

accessible area (30" of 45" total weld length)

No Recordable Indications 2014 Exam Category B-A 60°RL 13 lnservice examination Item No. B 1.22 limited due to CRD Fig. IWB-2500-3 penetration in Bottom Head. Examined 100%

of required volume in 43.47%

accessible area (60" of 138" total weld length)

No Recordable Indications Page 10 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Bottom Reactor Vessel Head Dollar Vertical HMA-B009 Weld 6 7/81h in. Thick 127.0 in Weld Length SA533 Grade B Class 1 Head To Reactor Vessel Flange Weld-HCC-C001 (Stud Holes 6 7/81h in. Thick 40 Through

60)

SA533 Grade B Class 1 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-A 60°RL 13 lnservice examination Item No. B 1.22 limited due to CRD Fig. IWB-2500-3 penetration in Bottom Head. Examined 100%

of required volume in 47%

accessible area (60" of 127" total weld length)

No Recordable Indications 2014 Exam Category B-A 60°RL 14, lnservice examination Item No. B 1.40 15 limited to due to RPV Fig. IWB-2500-5 Top Head flange configuration -Single side exam.

76.05%

No Recordable Indications Page 11 of 35 Surface Examination Results Surface examination is not required by Code.

Magnetic Particle examination performed obtaining 100% coverage. No recordable indications.

System System Component ID Configuration Diameter-Schedule Material Reactor Feedwater Nozzle-To-Vessel Weld FWD-D001 411/16 in. Thick 28 5/8 in. OD SA533 Grade 8 Class 1 SA508 Class 2 Reactor Standby Liquid Control Nozzle-To-Vessel Weld LCA-D001 5 % in. Thick 13 % in. OD SA533 Grade 8 Class 1 SA508 Class 2 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category 8-D 40° & 45° 16 lnservice examination Item No. 83.90 SHEAR; limited due to RPV Fig. IWB-2500-7 60°RL Nozzle-to-vessel configuration - Single side exam 87.67%

No Recordable Indications 2014 Exam Category 8-D 40° & 45° 17 lnservice examination Item No. 83.90 SHEAR; limited due to RPV Fig. IW8-2500-7 60°RL Nozzle-to-vessel configuration and RPV Support Skirt - Single 63.71%

side exam No Recordable Indications Page 12 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Reactor Main Steam Nozzle-To-Vessel Weld MSC-D001 5 % in. Thick 38 in. OD SA533 Grade 8 Class 1 SA508 Class 2 Reactor Vessel Instrumentation Nozzle-To-Vessel Weld Vl8-D001 4 11/16 in. Thick 13 % in. OD SA533 Grade 8 Class 1 SA508 Class 2 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category 8-D 40° & 45° 18 lnservice examination Item No. 83.90 SHEAR; limited due to RPV Fig. IW8-2500-7 60°RL Nozzle-to-vessel configuration - Single side exam 79.38%

No Recordable Indications 2014 Exam Category 8-D 40° & 45° 19 lnservice examination Item No. 83.90 SHEAR; limited due to RPV Fig. IW8-2500-7 60°RL Nozzle-to-vessel configuration - Single side exam 82.4%

No Recordable Indications Page 13 of 35 Surface Examination Results Surface examination is not required by Code.

Surface examination is not required by Code.

System System Component ID Configuration Diameter-Schedule Material Ligaments Reactor Vessel Studs 1 -

60 CLSR HD-LGMNTS (Threads-In-Flange) 6 in. Diameter SA508 Class 2 Nozzle-To-

"A" RHR Heat Vessel Weld Exchanger HEA-CB-2 1 in. Thick 16 in. ID SA516 Grade 70 DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 TABLE 1 Year Applicable Code Examination of Requirement and Angle and Fig.

Impracticality of Exam Coverage Credit Wave Mode Compliance 2014 Exam Category B-G-1 0°L 20 lnservice examination Item No. 86.40 limited to due to RPV Fig. IWB-2500-12 Flange configuration No Recordable 87.15%

Indications Exam Category C-B 21 lnservice examination 2014 Item No. C2.21 70° & 45° limited due to nozzle to Fig. IWC-2500-3(a)

SHEAR shell configuration and also physical obstruction from the 71%

adjacent shell to flange weld from 19" to 34" of the weld circumference.

No Recordable Indications Page 14 of 35 Surface Examination Results Surface examination is not required by Code.

Magnetic Particle examination performed obtaining 100% coverage. No recordable indications.

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 15 of 35 VLAA 1 LI MITATIONS VLAA 1 & VLAA2 LI MITATIONS l 1 53.5~ ELEVATION

! I

\\

f-*~

~--~

I I

I I

I I

I

' i 12.25" ELEVATION

~L t::~n1s" t::d ~~

~n

--~~~~~ '-T-:Z:::z:z? :::Z:::Z-~

o*

90" REACTOR VESSEL VLAA 1 & VLAA2 SCANNING LI MITATION AT UNDERSIDE OF JET PUM P BRACKETS VLAA 1 & VLAA2 SCANNING LI MITATION DUE TO SENSING LI NE BRACKETS ON JET PUM PS VLAA 1 & VLAA2 LIMITATION DUE TO CABLE INTERFERENCE

'NITH SENSING LI NE BRACKETS Figure 1 - VLA-A001 SHROUD JET PUMP J ET PUMP SUPPORT PLATE

229.5..

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 16 of 35 VLAA2 LI MITATI ON S VLAA 1 & VLAA2 LI MITATIONS E4~P u i[i II JL IZl'.:...!t!. ~

REACTOR VESSEL VLAA 1 & VLAA2 SCANNING LIMITATION AT UNDERSIDE OF JET PUMP BRACKETS VLAA 1 & VLAA2 SCANNING LIMIT.A.TION DUE TO SENSING LINE BRACKETS ON JET PUMPS VLAA 1 & VLAA2 LIMIT.A.TION DUE TO CABLE INTERFERENCE WITH SENSING LI NE BRACK ETS Figure 2 - VLA-A002 SHROUD JET PUMP JET PUMP SUPPORT PLATE

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:

Page 17 of 35 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 UNIT 1 WELD NO.

VLA-Al WesDyne#

W8 LIMITATIONS NOD UT RESULTS NI RI

~ D EXAM DOCUMENTATION

@ANALYSIS LOG

@ACQUISITION LOG

@SCAN PRINTOUT

@COVERAGE BREAKDOWN DESCRIF'I'ION 1" Course Long. Wdd 54° YES~

82.01%

NO.OF UT INDICATIONS __

0 STATUS NIA INDICATION DOCUMENTATION (j ASSESSMENT SHEET L.....J D PARAGON HARD COPY D OTHER ( specify)

Data quality verified as required by procedure.

WESDYNEANALYST: C.S. Wyffels (1,,(i/J---= Level: Ill Date: 10/18/14 I

Duane Arnold Energy Center.

RPV COVERAGE ESTIMATE BREAKDOWNS DIRECTION !ORIENTATION PARALLa SCANS UPIDOWN PERP. SCANS CCVI/ I CW WELD ST DESCRIPTION 1 Course Long Seam Weld @54

• WELD NO.

VLA-A1 BEAM ANGLES BEAM 45°LDual 4$0 L 45° Shear TOTAL%

DIRECTION 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 UP/DOWN 37.47 10.19 36.56 84.23 COMBIMED UT COVERAGE=

See exam volume 82.01%

EPP sketch shaat 11 of 11 Limitaliom: Jet Pump Support Plate-Jet Pump Restrainer Bracket-Sensing Line Bracket ANALYST: C.S.Wy!Tels ~A vt--

Level: ID Date: 10/18(14 I

Figure 4 - VLA-A001

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Page 19 of 35 WesDyne International Reactor Vessei Weld Results Smnmary Duane Arnold Energy Center RPV COVERAGE ESTIMATE BREAKDOWNS DIRECTION I ORIENTATION DUANE ARNOLD ENERGY CENTER UNIT 1 WELD NO.

VLA-A2 WesDyne#

W9 LIMITATIONS NOD UT RESULTS NI RI

~ D EXAM DOCUMENTATION

[RI ANALYSIS LOG

[Rj ACQUISffiON LOG (R] SCAN PRINTOUT

[RI COVERAGE BREAKDOWN DESCRIPTION I" Coarse Long. Weld@234" YES [!)

86.65"/o NO--:C:W UT INDICATIONS __

o STATUS NIA INDICATION DOCUMENTATION D ASSESSMENT SHEET D PARAGON HARD COPY D OTHER ( ~ify)

Data quality verified as required by procedure.

PARALLEL SCANS UP/DOWN PERP. SCANS CCW I CW waD ST DESCRIPTION 1 Course Long Seam Weld @234*

WELD NO.

VLA-"2 BEAM ANGLES BEAM 45" LDual 45° L 45° Shear TOTAL%

DIRECTION WEIGliTEO EXAM WEIGHTED EXAM WSGHTED EXAM EXAM VOLUME VOWME (47.62%)

VOWME (12.3811)

VOLUME l*0.0%)

CCW/CW 40.73 9.55 I 34.14 84.42 UP/DOWN 39.69 10.n 38.42 88.87 COMBIMED UT COVERAGE=

See exam volume 86.65%

EPPsketchlhaat11 of11 Limitations: Jet Pump Support Plate-Jet Pump Restrainer Bracket-Sensing Line Bracket WESDYNE ANALYST: C. S. Wyffels t'./-tf J---

1 Level: III Date: 10/19/14 ANALYST: C.S.Wytfels e,J~

Level: ID Date: 10/19/14 Figure 5 - VLA-A002

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 I jl 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 J 52" 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 20 of 35

465.88 ~

s12.oo ~I DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017

.19 (NOM.)

VLA-Al (WB) @ 54*

VLA-A2 (W9) @ 234' 3.70' Perp. Seen Stop 3.$3" Par. Index Stop 3.8S Per. lndex Start 3.70' Perp. Scan Start R92.50 SCAN INCREMENTS PAR. -

0.31" <0.5')

PERP - o.s*

DUANE ARNOLD

'I---.....

fE.14.51 Bottom Par.

I

"'--1:)14.89 Bottom Perp.

2014 EXAMINATION PROGRAM PLAN Rev. 1 FIRST COURSE LONG SEAMS 92.50 I VE:SDYNE: I.:.-=.-:.1SH££T u er al Figure 7 - VLA-A001 and VLA-A002 Page 21 of 35

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NO.I DATE I REV~N

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Page 24 of 35 NO.

OESCR!PTI~

I BILL CF MATL. I PROCEil.

I SE~'S'J£ Lil£ I is ~~SOI ~ii I A376.,,. "311. rr )Cl 2 BRACKET I

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'tESSEL SHELL SENSJNG LlNE ASSEMBLY VS 07<1>

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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

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PLAN Page 25 of 35 RPV Support Skirt obstructing meridional welds Figure 11 - HMA-8001, HMA-8002, HMA-8003, HMA-8004, HMA-8005, HMA-8006 (MERIDIONAL WELDS)

"51f.P:

. '"5G,tt'...

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 Weld Length sectional area area scanned scanned 57.90 area scanned scanned auto manual (in.}

(sq. in.)

(sq. in.)

on.)

(in.)

60° T-scan 64.5 64.5 100 0

46.5 60° P-scan CW 64.5 64.5 100 0

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Page 26 of 35 Percent Percent scanned scanned auto manual 0

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80.31 0.0 80.3 Figure 12 - HMA-8001, HMA-8002, HMA-8003, HMA-8004, HMA-8005, HMA-8006 (Typical Coverage)

IES:

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CH1 0-ll1l>~

(Hll-101 CH12-10l Inservice Inspection Program DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Page 27 of 35 Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 PLAN BOTTOM HEAD ASSEMBLY HMA-8007 - 30" of 45" total weld length= 66%,

HMA-8008 - 60" of 138" total weld length = 43.47%

HMA-8009 - 60" of 127" total weld length = 47%

Figure 13 - BOTTOM HEAD ASSEMBLY (Welds HMA-8007, HMA-8008 & HMA-8009)

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DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 SEE VS - 0J - 3q<2>

DETAI L 10 tHCC-82>

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• 2 655-335. APED-3!1 -2655 *2l l.

APE0 - 811*2G55-2 l5 t

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Page 28 of 35 s0*

1 a0° LI GAMENT LOCAT[ON No. Ll ~05 Figure 14 - HCC-C001 (3rd Period - 1 /3rd of Vessel Ligament Exam Location)

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 Aa>il,.,.,, &:amrw 60 degl"l!e R.L Ax:lsl 11can diractfon: Ho-lght x wldUt

_!:.!!!__ lnch..s x

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1.53 x.IS

-ea;;;-

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J:

Aldal scan dfnte:llon area c>asmlned

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~Inches x

~Inches 11quala....E:!!!!!.. i;quam lndl<ls cn~-t..:

r

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___ o_lnc:hMJ x

r> __ lnc:hes equals __ o __ SCIU*nl lnchn Salc2:1 Combining.. 11 acan cllrec:tlon1':

~sqmnt

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eq1121s e>oYC!f2S<t "chle¥CICI

...!!:.!!!.. % cover.age for total exam Calcubrllcns p<tdormed by:

Todd B'Je.chlnsCl'r-l.(Mol

_11_1 --

DAECRevl-Empk Pohmen l"""I Ill ANll Rrrilrw Page 29 of 35 I Coverage plot-Axial scan direction 60dcg.

Head An:a of covcrngc

oCO\\lerage CCIJ

• / **.,_,,. '(1)

Flange 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 Area reg111recl to be ~xami!!ecl A:w:ial scan direction: *'leighhwidth 6.25 iM:he'S 2:.86 mclles equals.

15.1>15 square incm x

Paral~I :seao tJirec1ion: Hei;M x vncUl'l 6.26 l.nci1e$

x

~i11ches equals ~square inch!!-!

T01al "'ro.a Nqulrec! to be examiJT>ed

~square i11ches requfred for complete enm Actual area examined G~ ~ree R.L Axial scan directilm: Height lt vnl1tll 5.26 Inc.hes x -1!,L inr:hc:s cqlr;'Jls ~

sciuare inches Tti<ingulat are.a not l!'xamil\\£'d (if appliesl o.ss 11.2 b;iSQ

~height equall> ~

squ;m1 i11chos

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ll:

Axial sean direction area examiaed

~

sqooro (ne00s SO de9!'0e-R.L. Pariltel stan direction; ttelght x widtl1 s.2:5 inches x

~in1:h1111 111q11als

~:sq~arvincbvs AddttioMI Inner 15% ama ael!fevecl llSing 411 & 4S oogl'il!'O s~nr tochrilquos:: ltlt~At 1C width n.7875 I nciles 0...5985 :square inches x

!:!.: Inches equals Combln 1119 all scan 'l!irectlons:

26.3284 $Ql.lllre lrwhes ie>r total eitam 01\\rlllfe a rem ax.a mined by nq111lrad ar1r<1:

~qu;lls coV111mgc ai::bicv11d 87,67 % covef*ge f-or total e:ic.am Figure 16 - FWD-0001 Axial scan direction A

60 deg.

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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 Area mutnd to bj!gamlned Axial scan dinH:lion: Height x widlh 6.26 inches x

3.007 inches equals -1!:!!!!. square Inches Paralllri scan <Jlrec.tlon: Height x wiiftff 5.26 incfles x

~inches equals..:!!:!!.!!. square inches Tolal area requlitd to !be examined 31.5736 square inches requlted fer complete cum Ac!ll!al area examined

~Ju.;

AiTar:scan direc.tlon: Helght x width us lnchoo x

~ilnches equals ~square inches Triangular area not examined (if applP8s}

1.37 112 base x

!::!!__ hai;ht equals..!:!!!!!. ill!CIW!e lnch0$

Percenlige of weld length examined in axial direction 62 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 Atkfdlonal Inner 15% area achiie'led using 46 degree shear technique: Height x width 0.7875 inches x

-1:.!!__ lncfles equals ~square Inches Combining all scan directions:

~square Inch" for tolll eom Divide area examined lby rnquired area~.

equals covmge acflieved 63.71 % coverage for total exam Figure 17 - LCA-0001

\\DAEC Nl 0 Coverage Plot

\\, Axial scan direction

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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.......

Am required to Pe examineid Axf~ !llean ~i~c~ _Height x wkltb

.. _ ~inches x

..2;!!!!_ ;nclles equals.?!:!!!!!. !llquare lnCIU!S 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

_}.007 inches equals 15.7868 square indtes Triangular area ~ot eumlned l~f ~lllSI __!;!!_ 112 lme x

__!!!_height equals _!:!!!!.square inches 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 Addltlonal Inner 15% area ac~eved using 40 & 4$ degree ihear techniques: Heightx Widlfl 0.7875 inches x

Combining all scan directions:

.....:!:!!.... inches equals ~square inches 1!:!!1 ~are *nches for total exam l?fvlde area *exa"'!1ned by required a'!a.:. __. ~Ills coverage achieved

~%coverage for total exam Figure 18 - MSC-0001

\\ \\\\ DAEC N3 Coverage Plot Parallel scan direction A

B c

No coverage G

E DAEC N3 Coverage Plot Axial scan direction No coverage

<A'V'

• _______ Area of cov

,_~-----

crage

~:

.. /Odeg.

,~

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 x

2.859 Inches equ;al:s.

~square Inches Paralfol u:an dinetlcn: Hiolght x width 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 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 Triangular a.roa net mx.amloocl 11r appllies) ~

1.ll bue x

~height equals 1.42975 square Inches Axial scari dlmctlon al'l!a eumlood

~

squ1re Inches 60 degM R.L P.'inllel sc:m direction: Height :i: width 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

Comblnlng a!l sc:11n diTileUons:

__!:.L_ iru:hu eqJ.111111 ~

squam int:htl:!I

~

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 Figure 19 - VIB-0001 H

F 60 decr

/o*

/,/'/

'1 \\ DAEC Nl 1 Coverage Plot

• '\\,,_.

Parallel scan direction A

~---*;:;* t_;:;;,~~-.-,.--_-f;i~*~------

/ l~~>

A:-c:aof"~o~c Jnner 15% CD.~i~~(~,;sz~_\\

---

A-

~~:~&Z:>>:~?'.:':(.~~~*D..a H

G F

F. E.L>----- -------

Drawing Not to Scale DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017 Drawing is representative of a.II ligament areas{Studs 1-60)

Area of Inadequate Probe Conlact Flange Surface Total scanning circumference= 20,0" Scanned circumference= 17.43"'

2.57" Stud &

Bushing 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)

Exam Area(Bushing + 1")

20.0" Circumference Figure 20 - Reactor Stud Ligament Exam Page 34 of 35

~i~1~ri~G!~'.~'..

~ ~;,.-

_~

rf J.J~.rn~0fi;:1;~~;1i~~j~w~~w~#ii;i'~;~ ~*-* *:;,

~**

~~-~{1

~~:!

• " :-:;;\\

.... ~~;

. :~:,......;.

. :~..

DUANE ARNOLD UNIT 1 FOURTH INSPECTION INTERVAL Duane Arnold 4th Interval 3rd Period Limited Exam Relief Request NDE-R017

~

• .~~

~t.1 /'Jo"L1't..lf

• {*

J~~;.:

Page 35 of 35

.,,_.if:S 10*.,,.,

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 1

~/Q Figure 21 - HEA-CB-2