Text

54-PQ-114-001, Technical Justification, Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds. Part 1 of 3
	ML16035A185
Person / Time
Site:	Monticello
Issue date:	01/30/2015
From:	Hacker M G, Key M W, Richards T; AREVA
To:	; Division of Spent Fuel Management, Office of Nuclear Reactor Regulation
Shared Package
ML16035A214	List: ML16035A184; ML16035A185; ML16035A186; ML16035A187;
References
	L-MT-16-003, TAC L25058 54-PQ-114-001
	Download: ML16035A185 (41)
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L-MT-1 6-0 03 Enclosure 4 ENCLOSURE 4 AREVA, INC.54-PQ-1 14-001 TITLE: Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds DATED: January 30, 2015 115 pages follow AREVA Inc.Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds 54-PQ-1 14-001 Procedure Effective on Date of Last Signature Prepared by: Approved by: Approved by: M. G. Hacker, AREVA -UT Level UlI T. A. Rich~ards, AREVA Manager NDE Technology

& Programs Date: df Z2o Z/S" Dat: -o/Page Ilof 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001I RECORD OF REVISION Rev.Para. #Description of Change 000 All Initial Issue Page 2 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 TABLE OF CONTENTS RECORD OF REVISION .....................................................................................

2 TABLE OF CONTENTS.......................................................................................

3 1.0 Scope ...................................................................................................

4 2.0 Description of Component to be Examined..........................................................

5 3.0 Description of Flaws to be Detected..................................................................

7 4.0 Overview of Examination System.....................................................................

8 5.0 Description of Influential Parameters

...............................................................

13 6.0 Description of Examination Techniques............................................................

43 7.0 Description of Modeling..............................................................................

46 8.0 Results of Laboratory Testing.......................................................................

49 9.0 Results of Performance Demonstration

...........................................................

109 10.0 References

..........................................................................................

110 Appendix A -Development Mockup Drawings ...................................................

111 Page 3 of 115 A ARE VA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ-1 14-001 1.0 SCOPE The scope of this document is to provide a description of the Phased Array Ultrasonic Examination process (PAUT) used for examination of the NUHOMS 61 BTH Type 1, Dry Shielded Canister (DSC) Inner Top Cover Plate (ITCP) and Outer Top Cover Plate (OTCP) lid welds and to provide the technical basis for the examination process. The examination has been designed to detect and dimension welding fabrication flaws that could potentially exist in the lid welds that have been welded using an automated gas tungsten arc weld (GTAW)process. The examination procedure, personnel, and equipment have been qualified in accordance with ASME Section V, Article 14, Examination System Qualification, Intermediate Rigor. This technical justification document supports the requirements of Article 14.This document addresses the following topics:* Description of the component to be examined* Description of flaw to be detected* Overview of the examination system* Description of influential parameters

Description of examination techniques

Description of modeling* Results of laboratory testing* Results of performance demonstration Page 4 of 115 A A R EVA Technical Justification P hased Array Ultrasonic Examination of Dry Storage Canister Lid Welds 54-PQ114-001 54-PQ-1 14-001

2.0 DESCRIPTION

OF COMPONENT TO BE EXAMINED The component to be examined is the NUHOMS 61 BTH Type 1, Dry Shielded Canister (DSC) Inner Top Cover Plate (ITCP) and Outer Top Cover Plate (OTCP) lid welds. The configuration is shown in Figures 2-1 and 2-2. The canister and weld material is 304 stainless steel. Because the scanning is performed form the canister 00 surface, the ITCP weld cannot be examined along the entire weld length because the weld does not attach to the canister wall at the location of the Siphon and Vent block shown in Figure 2-3. The weld length that cannot be examined with this process is approximately 15.5" long. The OTCP lid weld has no limitations.

Figure 2-1 DSC Lid Weld Configuration Page 5 of 115 A AR EVA Technical Justification IIII Figure 2-2 DSC Lid Weld Dimensions Figure 2-3 DSC ITCP Lid Weld Examination Limitation Page 6 of 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds54-PQ-1 14-001

3.0 DESCRIPTION

OF FLAWS TO BE DETECTED The ITCP and OTCP lid welds are made using an automated gas tungsten arc weld (GTAW)process. The techniques described in this document are intended to detect and dimension welding fabrication flaws wherever they occur in the weld volume. Possible welding manufacturing flaws of interest include sidewall and inter-bead lack of fusion, incomplete root penetration, and tungsten inclusions.

At the onset of this project, critical flaw sizes were not established and therefore the development of the examination process was focused on detection of flaws over a range of sizes, orientations, and distributions throughout the weld volume for both weld configurations.

The welding manufacturing flaws implanted in the mockup used for development of the processes described in this document are shown in Appendix A. The techniques developed have been evaluated for flaw detection capability and dimensioning accuracy on the development mockup and the results, including flaw sizes, are included in Section 8.In addition, system performance for flaw detection and dimensioning have been quantified by"blind" demonstration on a mockup containing flaws similar to those shown in Appendix A. The results of blind demonstration are discussed in Section 9.Porosity was not included because this type of flaw was not considered significant for this weld process. Porosity tends to be embedded, of small volumetric dimension, and would be unlikely to extend through the thickness of multiple weld beads.Page 7 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ

-1 14-001 4.0 OVERVIEW OF EXAMINATION SYSTEM The examination system is diagramed in Figure 4-1. It includes the Zetec Phased Array UT instrument (model Z-scan PA 64/128-R-0), transducers, a scanner controller, a scanner and a data acquisition computer.

The UT system hardware is listed Table 4-1. The UT system software is listed in Table 4-2. The phased array transducers for detection and sizing are listed in Tables 4-3 and 4-4. The transducer wedge information is included in Table 4-5.Figure 4-2 is an illustration of the scanner track mounted to the canister for scanning and Figure 4-3 shows the scanner attached to the track with the transducer positioned in the gap between the transfer cask and the canister.Figure 4-1 System Diagram Item Component I Description Model Number 1 Zetec / ONDT PA instrument Z-Scan PA 64/1 28-R-O 2 Phased array main acquisition card EQUX287A-204

_______ ~ (64-128 PP/PR) ______________

3 Piggy/Acquisition PA card EU28-0____(64-128 PP/PR) EQU____ 288B-204_____

4 Computer System with Storage Device Standard PC w,'Windows OS Page 8 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 Item Mandufctue Function Demonstrated Version Zetec /1 UltraVision Data Acquisition Version 1 .2R7 Zetec /2 UltraVision Data Analysis Version 1 .2R7 Zetec/ Advanced Focal Law Vrin1.R PA Calculator Calculator

______________

Manufacturer Olympus Model 3.5DM10x6PM12,6x12.6-A-P-1 1-___ ___ ___ ___ __ ___ ___ ___ __ OM Frequency 3.5 MHz Bandwidth

>60%Array Design 2D Matrix (120 elements)Number of elements on Primary Axis (each array) 10 Number of elements on Secondary Axis (each array) 6 Primary Axis Pitch 1.26 mm Secondary Axis Pitch 2.10 mm Primary Element Size 1.18 mm Secondary Element Size 2.02 mm Primary Axis Offset Middle 1s Element (from housing) 13.38 mm Secondary Axis Offset Middle 1 st Element (from 12.80 mm housing)Active Length (Azimuth) (each array) 12.60 mm Active Width (Elevation) (each array) 12.60mm Cable Type 50 Ohm Coax -42 gauge PVC Jacket Cable Lenglth 11 m (36.09fft)

Page 9 of 115 A ARE VA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001I Manufacturer Olympus Model 5DM10x6PM 7.5x7.5-A-P-1 1-OM Frequency 5.0 MHz Bandwidth

>60%Array Design 2D Matrix (120 elements)Number of elements on Primary Axis (each array) 10 Number of elements on Secondary Axis (each array) 6 Primary Axis Pitch 0.75 mm Secondary Axis Pitch 1.25 mm Primary Element Size 0.67 mm Secondary Element Size 1.17 mm Primary Axis Offset Middle 1st Element (from housing) 15.68 mm Secondary Axis Offset Middle 1 st Element (from 17.48 mm housing)Active Length (Azimuth) (each array) 7.50 mm Active Width (Elevation) (each array) 7.50 mm Cable Type 50 Ohm Coax -42 gauge PVC______________________________________Jacket Cable Lenglth 11 m (36.09 ft.)Wedge Angle 5 deg.Roof Angle 0Odeg.Longitudinal Velocity of Wedge (Rexolite) 2330 _______m/s___

Transverse Velocity of Wedge (Rexolite) 1155 ________m/s___

Density 1.054 g/cc Height at Middle of First Element 4.0589 mm Material Rexolite Page 10 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid WeldsI I 54-PQ-1 14-001 4 Lifting Points Outer Top Cover Plate Spacers ,Cable Management Mast Figure 4-2 Scanner Track Arrangement Page 11 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds I 54-PQ- 14-00 I I Figure 4-3 Scanner with Transducer Positioned for Scanning Page 12 of 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds __54-PQ-1 14-001

5.0 DESCRIPTION

OF INFLUENTIAL PARAMETERS

5.1 Temperature

The canister temperature is expected to be approximately 150°F during examination.

This elevated temperature is above the operating range of the transducer and measures are employed to assure the transducer can be used in this environment without exceeding the operating range.Experiments were conducted to quantify the effects of elevated temperature on the probe and on the UT data in order to assure no adverse effects during the field examination.

The elevated temperature, above the operating range has potential consequences that include possible transducer degradation and a slight decrease in sound velocity in the transducer wedge and canister materials.

Any possible effect of temperature on the sound velocities or attenuation will be factored into the system calibration by heating the reference block to within 25°F of the canister.

Tests were performed to understand the effects that elevated temperatures have on both the probe and UT data.In order to keep the transducer within the operating range, the transducer housing was manufactured with two layers of water channels to provide cooling. Water supplied from the plant at approximately 70°F will be used for cooling. Water flow enters in one side of the housing and exits on the opposite side and is then ported to the transducer wedge for cooling and to provide coupling for the examination.

This process is the same for the second layer of water channels as shown in Figure 5-1.IWedge )Scan Surface Figure 5-1 Probe (transducer/wedge unit) with Water Ports Tests were performed to quantify the ability of the cooling water to keep the transducer within its operating range while scanning on the canister at temperatures above the operating range of the transducer.

The test was performed twice to verify the results.To perform the measurements, the test block was heated using a ceramic strip heater on the opposite surface of the block with the transducer in contact with the block and water flow off. The transducer and block was covered with an insulating blanket to Page 13 of 115 A AR EVA Technical Justification IPhased Array ultrasonic Examination of Dry Storage canister Lidweds54-PQ-1 14-00154P_1-0 assure uniform heating. The transducer and block temperature were monitored using a thermo-couple probe.The transducer housing temperature was heated to 108 0 F (near upper operating limit)and held at that temperature for approximately 20 minutes without water flow. The block surface temperature under the probe was measured at 169°F. After 20 minutes, the cooling water (~70°F) was turned on. In less than a minute, the probe housing temperature reduced to 92°F and the block surface temperature under the probe reduced to 143°F. As expected, the cooling water reduced the probe temperature to within normal operating limits and reduced the block surface temperature.

Probe temperatures during multiple tests averaged ~85-90°F with block surface temperature averaging

-180-1 85°F.Multiple tests were performed by scanning the development mockup at elevated temperatures to quantify the effects of elevated temperatures on flaw detection and measurement.

The tests confirmed that the water flow was effective at keeping the temperature of the probe within normal operating limits. The development mockup (Sample no. 5575-1-01) contains flaws at 2" intervals in both the ITCP and OTOP welds. Temperature measurements were recorded at each of those locations prior to and after scanning.

The probe top surface and wedge surface temperatures were also recorded.

The values are presented in Table 5-1 are from one of those tests and are typical of the other test runs.ProbeANedge Block Position 2" 46" 8 10 12 1" Temp. °F 24 " 8 0 2 4 110/132 Start Temp. °F 191 199 202 19 190 171 146 85/95 En 0 130 129 127 13 123 120 115 Page 14 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 Table 5-2 presents the measurements from the first test. Sixteen flaws in the open development mockup (Sample no. 5575-1-01) were used for comparison; 8 flaws in the ITCP weld and 8 flaws in the OTCP weld. Measurements of system gain (dB) required to set the indication amplitude at the same level and depth were recorded for each of the 16 flaws at ambient temperature

(~72°F) and then with the block heated to the elevated temperatures listed in the table. The temperature profile varied along the length of the block as noted. The results of this test show that, even at temperatures well in excess of the expected temperature of the DSC, the effects are negligible and within the expected range of repeatability between data sets.The elevated temperature measurement for flaw #5 shows a difference of 7.5dB compared to the ambient temperature measurement.

This is an anomaly attributed to a water coupling issue at that location with that scan. Other scans of this flaw show a difference of 1.5 dB (see Table 5-3) which is more representative of measurements from other flaws. If 1.5dB is substituted for the 7.5dB the average variance is 0.1dB vs.0.5dB and is more consistent with the second test results shown in Table 5-3.Page 15 of 115 A AR EVA Technical Justification L Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds 54-PQ-1 14-001 In conclusion, the temperature tests confirm the ability of the cooling water to keep the probe within normal operating limits. The tests also show that the amplitude response is not adversely affected by higher temperatures and is within the expected measurement repeatability of +/-3dB. The average temperatures recorded during these tests span the expected temperature of the canister during the field examination and provides a bounding condition.

Also of note is that the measured depth of the flaws increased slightly due to a small decrease in sound velocity due to the elevated temperatures.

The small increase in depth has no effect on flaw detection or dimensioning.

For comparative purposes the flaw images from the ambient temperature scan and the elevated temperature scan used in Table 5-3 are included in Figures 5-2 through 5-33.Page 16 of 115 A AR EVA Technical Justification tPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 Figure 5-2 -Flaw 1 @ 72 0 F Figure 5-3 -Flaw I @ 123 0 F Page 17 of 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds54-PQ-1 14-001 Figure 5-4 -Flaw 2 @ 72 0 F Figure 5-5 -Flaw 2 @ 166°F Page 18 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid I54-PQ-1 14-001 WeldsI54-PQ-1 14-001 A Figure 5-6 -Flaw 3 @72°F Figure 5-7 -Flaw 3 @ 172°F Page 19 of 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-i114-001 Welds 54-PQ-I114-001 1 41 _ __2 a-I-I Figure 5-8 -Flaw 4 @72°F 41_ _ __ _ _m ff I Figure 5-9 -Flaw 4 @ 180°F Page 20 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds~~114-00 Figure 5-10 -Flaw 5 @ 720 Figure 5-11 -Flaw 5 @ 174 0 F Page 21 of 115 A ARE VA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ -1 14-001 Figure 5-12 -Flaw 6 @ 72°F ItE 40 I¸ --i I_____ 'I ami-Figure 5-13 -Flaw 6 @ 142°F Page 22 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid WeldsI I I14oo Figure 5-14 -Flaw 7 @ 72 0 F Figure 5-15 -Flaw 7 @ 116°F Page 23 of 115 A ARE VA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WelsI54-PQ-1 14-001 Figure 5-16 -Flaw 8 @ 72°F Figure 5-17 -Flaw 8 @ 98°F Page 24 of 115 A AR EVA Technical Justification I Phased Array Ultrasonic Examination of Dry Storage Canister Lid I54-PQ-1 14-001 Welds 54-PQ-1 14-001191254 -~ U U 4 Figure 5-18 -Flaw 12 @ 72°F Figure 5-19 -Flaw 12 @ 123 0 F Page 25 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds!54-PQ-1 14-001 Figure 5-20 -Flaw 13 @ 72°F Figure 5-21 -Flaw 13 @ 166 0 F Page 26 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 I 77~125lm-~ U 4 4 I 6-1m Figure 5-22 -Flaw 14 @ 72 0 F Figure 5-23 -Flaw 14 @ 172 0 F Page 27 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ-1 14-001 Figure 5-24 -Flaw 15 @ 72 0 F Figure 5-25 -Flaw 15 @ 180 0 F Page 28 of 115 A AR EVA Technical Justification P hased Array Ultrasonic Examination of Dry Storage Canister Lid WeldsI 5il4-PQ-1400 54-P Q-1 14-001 Figure 5-26 -Flaw 16 @ 72 0 F Figure 5-27 -Flaw 16 @ 174°F Page 29 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ-1 14-001 Il ti 2U2~1~uflL~I£4 i 4* ; * * ~22Ii 323~1"Im Figure 5-28 -Flaw 17 @ 72 0 F Figure 5-29 -Flaw 17 @ 142 0 F Page 30 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid & 5-PQ-1 14-001 WeldsI54-PQ-1 14-0011 Figure 5-30 -Flaw 18 @ 72°F Figure 5-31 -Flaw 18 @116°F Page 31 of 115 A AR EVA Technical Justification I Phased Array Ultrasonic Examination of Dry Storage Canister Lid I54-PQ-1 14-001 Welds 54-PQ-1 14-001I IC I-Figure 5-32 -Flaw 19 @ 72°F"I1.576 i Figure 5-33 -Flaw 19 @ 98°F Page 32 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 5.2 Loss of Active Elements:

The phased array transducer has 120 elements; 60 elements on the transmit side and 60 elements on the receive side. Because of the potential for some of the elements to become non-functional during an examination, the effect of inactive elements on the examination must be understood.

Inactive elements can be the result of failed pulser/receiver channels, damaged pins on the probe connector, damaged probe wires, or detached piezoelectric elements within the probe.As the number of inactive elements increase, the expected result would be a loss of energy and beam formation capability; evident by loss of signal amplitude and degraded signal to noise ratio. The intent with this test is to deactivate a number of elements and demonstrate that the effect does not degrade the flaw detection or sizing capabilities.

For this purpose, a test was conducted with all elements functional providing a baseline and with deactivated elements to quantify the effects. Data was acquired with 3 inactive elements on the transmitter side and 3 inactive elements on the receiver side with 2 of the inactive elements adjacent to each other. Three elements were selected based on a reasonable estimate that could be lost without having a measureable impact on the data. In this case, 3 elements represent 5% of the total number of elements on either the transmitter or receiver side of the probe. Two adjacent elements were selected because the combined effect is expected to be greater than if the elements were randomly distributed over the transducer.

For these tests, elements 1, 2, and 40 on the transmit side were deactivated and elements 60, 61, and 100 were deactivated on the receiver side.Both scans are then compared to quantify the effects of inactive elements.

Scanning was performed using all of the essential variable parameters as documented in AREVA procedure 54-UT-i114-001.

Scanning was performed on the DSC ITCP and OTCP lid weld mockup (Sample no.5575-1 -01) that contains flaws distributed along the length of the mockup in both welds.Flaws 2, 8, 13, and 18 were selected for comparison because they provide a range of flaw depths and intercepting beam angles that would challenge the beam formation and energy content. Table 5-4 lists the gain values recorded to set the maximum signal amplitude at -6dB. Figures 5-34 through 5-41 are images of the flaw responses taken from the two separate scans, one with all elements active and then with 3 elements deactivated as describe above. The measurements are all within l1dB, well within measurement repeatability of +3dB, and prove that inactive elements up to the number described above have no adverse effect on the ultrasonic data.Flaw -Gain with all elements ACTIVE Gain with elements DEACTIVATED 2 41dB 41dB___8 37.5dB 38.5dB 13 21.5dB 22dB 18 29dB 30dB Page 33 of 115 A ARE VA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid I 54-PQ-1 14-001 WeldsI54-PQ-1 14-001I Figure 5-34 -Flaw 2: All Elements Active Figure 5-35 -Flaw 2: 3 Transmit, 3 Receive Elements Inactive Page 34 of 115 A AR EVA Technical Justification IPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001I I~5I 2Z~5d*........ .................

.... * , .... *

I:ilF¸ au4i Figure 5-36 -Flaw 8: All Elements Active Figure 5-37 -Flaw 8: 3 Transmit, 3 Receive Elements Inactive Page 35 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid I54-PQ-1 14-001 WeldsI54-PQ-1 14-001I IA2~ 22S~" i! , i ¸ .... .... .. ... ........ ... .. .. .... ..... .. .. ..........

........ ..... ..... ..... .. ....... ... !!! i ... ..... .,!, iiFigure 5-38 -Flaw 13: All Elements Active Figure 5-39 -Flaw 13: 3 Transmit, 3 Receive Elements Inactive Page 36 of 115 A AR EVA T echnical Justitication P hased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ-1 14-001 Figure 5-40 -Flaw 18: All Elements Active k 0.l!I, ij~A r I 1 snimuud N I,1 L2162+/- -!I S pl= = ._____ .1 Figure 5-41 -Flaw 18: 3 Transmit, 3 Receive Elements Inactive Page 37 of 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid\A/Icr4 54PQ114-001

....54-PQ-1 14-001 5.3 Curvature/Coupling Effects: The mockup blocks used for procedure development and demonstration replicate the geometry and materials of the DSC ITOP and OTCP lid welds with the exception of curvature.

The mockups blocks and transducer wedges are flat while the canister has an outside diameter of 67.25". The probe housing is 2" wide to accommodate the water cooling ports, however the width of the active elements is 1.07" (12.6mm x 12.6mm + 2.02mm gap) for the detection probe and 0.67" (7.5 mm x 7.5mm + 2.02mm gap) for the sizing probe.The total width of the active elements across the flat wedge has been assessed on the canister OD curvature as shown in Figures 5-42 (detection probe) and 5-43 (sizing probe). The results show that the maximum gap at the edge of the active element of the detection probe is 0.108mm (0.0042")

and 0.04mm (0.001 6") for the sizing probe.The scanner configuration is designed to keep the transducer tangent to the canister OD while scanning and in this configuration the maximum gap at the edge of the active elements is insignificant.

Therefore, the procedure demonstration results may be extrapolated directly to the curved canister.Coupling for the examination is provided by water flowing through ports in the transducer wedge. The ports are located near the top of the wedge on the contact surface. When the transducer is mounted in the field scanning position on the canister wall, gravity assists in directing the water to the active area of the wedge. During scanning of the mockup blocks for development and demonstration the scan surface was horizontal (not in field orientation).

In this orientation it is more challenging to maintain adequate coupling during the scans performed on the OTCP lid weld because the water ports are slightly above the canister wall and much of the water escapes.Nevertheless, coupling was sufficient for flaw detection and sizing for the development and demonstration scanning.In the field vertical scan position, coupling is expected to be as good as or better than that observed during the demonstration for the reasons stated above. Monitoring of the typical geometric responses associated with the ITOP and OTOP weld geometry allow for confirmation of adequate sound coupling in the canister material.

This response can be observed real time during scanning and during data analysis.Page 38 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 ESWedgeGap Report Wedge Into Diameter of Cunature:*

Flat Width "27.22 mm 3.5 MHz Detection Probe Contact Assessment Part Info Diameter of Cuwvature

Results Edge Gap =0.11 mm Center Gap = 0 mmr Setup Figure 1708.15 mm S Active Width of Transducer Gap 0 {)108 mm=1708 15 Figure 5-42 -Wedge Gap Analysis for Detection Probe Page 39 of 115 A AR EVA Technical Justification ESWedgeGap Report Wedge Info Diameter of Cunrature

Flat Width : 1.02 mm Part Info Diameter of Cunrature

170815S mm Results Edge Gap = 0.04 mm Center Gap =0 mm Setup Figure 5 MHz Sizing Probe Contact Assessment Active Width of Transducer E -17 02 mm -Gaps=0042 m\DOC 170 m IF'5 Figure 5-43 -Wedge Gap Analysis for Detection Probe Page 40 of 115 L-MT-1 6-0 03 Enclosure 4 ENCLOSURE 4 AREVA, INC.54-PQ-1 14-001 TITLE: Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds DATED: January 30, 2015 115 pages follow AREVA Inc.Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid Welds 54-PQ-1 14-001 Procedure Effective on Date of Last Signature Prepared by: Approved by: Approved by: M. G. Hacker, AREVA -UT Level UlI T. A. Rich~ards, AREVA Manager NDE Technology

& Programs Date: df Z2o Z/S" Dat: -o/Page Ilof 115 A AR EVA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001I RECORD OF REVISION Rev.Para. #Description of Change 000 All Initial Issue Page 2 of 115 A AR EVA Technical Justification Phased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 Welds 54-PQ-1 14-001 TABLE OF CONTENTS RECORD OF REVISION .....................................................................................

2 TABLE OF CONTENTS.......................................................................................

3 1.0 Scope ...................................................................................................

4 2.0 Description of Component to be Examined..........................................................

5 3.0 Description of Flaws to be Detected..................................................................

7 4.0 Overview of Examination System.....................................................................

8 5.0 Description of Influential Parameters

...............................................................

13 6.0 Description of Examination Techniques............................................................

43 7.0 Description of Modeling..............................................................................

46 8.0 Results of Laboratory Testing.......................................................................

49 9.0 Results of Performance Demonstration

...........................................................

109 10.0 References

..........................................................................................

110 Appendix A -Development Mockup Drawings ...................................................

111 Page 3 of 115 A ARE VA Technical Justification SPhased Array Ultrasonic Examination of Dry Storage Canister Lid 54-PQ-1 14-001 WeldsI54-PQ-1 14-001 1.0 SCOPE The scope of this document is to provide a description of the Phased Array Ultrasonic Examination process (PAUT) used for examination of the NUHOMS 61 BTH Type 1, Dry Shielded Canister (DSC) Inner Top Cover Plate (ITCP) and Outer Top Cover Plate (OTCP) lid welds and to provide the technical basis for the examination process. The examination has been designed to detect and dimension welding fabrication flaws that could potentially exist in the lid welds that have been welded using an automated gas tungsten arc weld (GTAW)process. The examination procedure, personnel, and equipment have been qualified in accordance with ASME Section V, Article 14, Examination System Qualification, Intermediate Rigor. This technical justification document supports the requirements of Article 14.This document addresses the following topics:* Description of the component to be examined* Description of flaw to be detected* Overview of the examination system* Description of influential parameters

Description of examination techniques

Description of modeling* Results of laboratory testing* Results of performance demonstration Page 4 of 115 A A R EVA Technical Justification P hased Array Ultrasonic Examination of Dry Storage Canister Lid Welds 54-PQ114-001 54-PQ-1 14-001