ML17059B022
| ML17059B022 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/15/1995 |
| From: | GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML17059B019 | List: |
| References | |
| UT-NMP-311V, UT-NMP-311V0, NUDOCS 9512220214 | |
| Download: ML17059B022 (38) | |
Text
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GE Nuclear Energy PRQCEDURE:
UT-NMP-311VO REvlsloN No.:
0 TITLE PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE, I
PROJECT MANAGER GE NDE AND RATIVE P OCEDURES:
PROJECT MANAGER:
UTILITYAPPROVAL
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DATE:
DATE:
COMMENTS: This procedure is the site specific version developed from GE-UT-311, Version 0. The following changes from the parent version have been made to incorporate Customer comments:
Revised Para. 2.2 to reflect GE NE's current personnel certification procedure.
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 1
of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE TABLE OF CONTENTS SECTION DESCRIPTION PAGE NO.
1-.0 SCOPE 2.0 3.0 4.0 5.0 6.0 7.0 8.0
9.0 REFERENCES
PERSONNEL EQUIPMENT CALIBRATION EXAMINATION RECORDING EVALUATION REPORTING FIGURE 1
FIGURE 2 FIGURE 3 16 10 FIGURE 4 FIGURE 5 FIGURE 6 FIGURE 7 FIGURE 8 12 13
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 2 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 1.0 SCOPE 1.1 This procedure defines the requirements for manual, pulse-echo ultrasonic (UT) examination of clad and unclad BWR nozzle inner radius and bore surfaces identified as Zones 1 thru 5. The ultrasonic examination for Zones 1 thru 5 is for the detection of axial thermal fatigue cracking.
1.2 The examination of Zones 1 and 2A are needed to meet the ASME Section Xl, Figure 2500-7 requirements.
Examinations of Zones 1, 2A, 28, 3, 4A, 48 and 5 are needed to meet NUREG-0619 nozzle inspection requirements.
The examination area for the Zones 1 thru 5 is the inside surface including 0.5" of the base material.
1.3 The examination region for NUREG-0619 begins at the inner radius, or taper to the vessel tangent point ("A" in Figure 1). The examination region ends at the safe end region ("8" in Figure 1), which can vary depending on what type of thermal sleeve is installed. For interference fit type sleeves "8" is at the last point downstream where the thermal sleeve is in contact with the safe end. For welded in type sleeves, "8" is the furthest point upstream where leakage could occur.
VESSEL NOZZLE SAFE END 4B 4A 2B 2A Figure 1
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 3 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 1.4 Scanning by this procedure of Zones 1 thru 5 is performed from all accessible outside diameter (OD) surfaces of the reactor vessel wall, nozzle and safe end.
Each Zone has its own unique examination technique.
The provisions permitted in ASME Section XI Paragraph IWA-2240 are the basis for this procedure.
Articles 4 and 5 of ASME Section V are used as guidelines in the procedure development.
1
~ 5 Prior to performing the examinations for a specific site, a Nozzle Examination Plan, identifying the inspection requirements for each nozzle to be examined (i.e. required zones, wedges, scan surfaces, etc.) shall be prepared or reviewed by the cognizant Level III in charge of nozzle examinations.
2.0 REFERENCE 2.1 American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section V and XI 1983 Edition, Summer 1983 Addenda.
2.2 General Electric document 386HA480, "Certification of Nondestructive Test Personnel".
2.3 NUREG 0619, "BWR Feedwater Nozzle and Control Rod Drive Return Line Nozzle Cracking".
2.4 GE Quality Assurance Manual, QAM-003, Quality Assurance Manual for Inservice Inspection".
2.5 General Electric procedure GE-ADM-1001, "Procedure for Linearity Checks on Ultrasonic Instruments".
2.6 General Electric procedure GE-ADM-1002, "Procedure for Review Process and Analysis of Recorded Indications".
2.7 General Electric procedure GE-ADM-1005, "Procedure for Zero Reference and Data Recording for Non-destructive Examinations".
2.8 General Electric procedure GE-UT-309, "Manual Planar Flaw Sizing of Nozzle Inner Radius and Bore Regions".
2.9 GE Test Procedure 508-1487, "Manual Nozzle Inner Radius UT Personnel Qualification".
2.10 NEDE - 31735P Class 3, "BWROG Manual for Materials and Processes".
2.11 The following documents, which may be prepared by the vessel fabricator, must be available, but are not considered to be a part of this procedure.
2.11.1 Reactor Vessel Fabrication Drawings, Nozzle Forging, and Nozzle Assembly Drawings applicable to the nozzles examined.
2.11.2 Detailed nozzle identification drawing, isometric or a verification from the Plant Owner.
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 4 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 3.0 PERSONNEL 3.1 Personnel performing examinations to this procedure shall be certified in accordance with paragraph 2.2.
Personnel certified to at least Level il shall perform system calibrations.
Level I personnel may perform examinations only under the direction of personnel certified to at least Level li.
3.2 Personnel reviewing or evaluating recorded data shall be certified to at least Level II.
3.3 Personnel performing examinations shall be trained in accordance with paragraph 2.9 on nozzle mockups with the techniques described herein.
4.0 EQUIPMENT 4.1 The ultrasonic instrument shall be of the pulse-echo type, and equipped with a calibrated dB gain or attenuator control stepped in increments of 2 dB or less.
4.2 Transducer General Requirements 4.2
~ 1 Two wedge designs used are: 1) the compound angle beam; or 2) the single angle beam.
4.2.2 The compound angle beam technique requires two wedges, one for the clockwise (CW) direction and the other for the counter-clockwise (CCW) direction.
The compound angle beam wedges are designed to produce both the required beam and rotation (skew) angles.
4.2.3 The single angle beam technique uses standard wedges that produce only a beam angle.
The operator must rotate this wedge to produce the required rotation angle.
4.3 Zone Transducers 4.3.1 Zone 1 Search Units 4.3.1.1 Round, elliptical, square or rectangular single element ceramic type search units shall have nominal dimensions that are between 0.5" to 1.25".
The nominal frequency for clad nozzles shall be 1.0 MHz and for unclad nozzles the nominal frequency shall be 2.0 - 2.25 MHz.
4.3.1.2 Zone 1 examinations require angle beam wedge designs that may be either compound or single angle beam types.
4.3. 1
~ 3 Wedges shall produce shear wave beam angles of a nominal 45
- 75't the inside surface.
4.3. 1.4 When scanning of the Zone 1 region is performed from the nozzle OD blend radius, the transducer and wedge requirements of paragraph 4.3.2.2 shall apply.
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.:,0 Page 5 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 4.3.2 Zone 2 Search Units 4.3.2.1 Round, elliptical, square or rectangular single element ceramic type search units shall have nominal dimensions that are between 0.5" to 1.0".
The nominal frequency for clad nozzles shall be 1.0 MHz and for unclad nozzles the nominal frequency shall be 2.0 - 2.25 MHz with the exception of paragraph 4.3.2.4.
4.3.2 '
Two contoured angle beam wedges for CW and CCW scanning of the Zone 2 (from the OD blend radius) are required. The compound angle beam wedges are designed to produce the required beam and rotation (skew) angles.
4.3'.3 Wedges shall produce shear wave beam angles of a nominal 45'- 70 at the inside surface.
4.3.2.4 Due to nozzle configuration it may not be possible to perform examinations from the OD blend radius surface.
Zone 2A examinations will require a single angle beam wedge that will produce a shear wave beam angle of a nominal 80~.
The nominal fre'quency for clad and unclad nozzles shall be 2.0 - 2.25 MHz.
4.3.3 Zone 3 Search Units 4.3.3.1 Round, elliptical, square or rectangular single element ceramic type search units shall have nominal dimensions that are between 0.5" to 1.0".
The nominal frequency for clad nozzles shall be 1.0 MHz and for unclad nozzles the nominal frequency shall be 2.0 - 2.25 MHz.
4.3.3.2 Zone 3 examinations require an angle beam wedge design that is the single angle beam type.
The wedges may be contoured to the curvature of the nozzle OD cylindrical surface.
If contoured wedges do not conform to the calibration block OD surface, they shall be calibrated as compound angle beam wedges.
4.3.3.3 Wedges shall produce shear wave beam angles of a nominal 45
- 70't the inside surface.
4.3.4 Zone 4A Search Units 4.3.4.1 Round, elliptical, square or rectangular single element ceramic type search units shall have nominal dimensions that are between 0.5" to 1.0".
The nominal frequency for clad nozzles shall be 1.0 MHz and for unclad nozzles the frequency shall be 2.0 - 2.25 MHz.
4.3.4.2 4.3.4.3 Zone 4A examinations require angle beam wedge designs that may be either compound or single angle beam types.
C Wedges shall produce shear wave beam angles of a nominal 45
- 70 at the inside surface.
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 6 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 4.3.5 Zone 4B Search Units 4.3.5
~ 1 Round, elliptical, square or rectangular single element ceramic type search units shall have nominal dimensions that are between 0.5" to 1.0".
The nominal frequency for clad nozzles shall be 1.0 MHz and for unclad nozzles the nominal frequency shall be 2.0 - 2.25 MHz.
4.3.5.2 Two contoured angle beam wedges for CW and CCW scanning of the Zone 4B (from the OD blend radius) are required. The compound angle beam wedges are designed to produce the required beam and rotation tskew) angles.
4.3.5.3 Wedges shall produce shear wave beam angles of a nominal 45'- 70 at the inside surface.
4.3
~ 6 Zone 5 Search Units 4.3.6.1 Round, elliptical or rectangular single / dual element ceramic type search units shall have nominal dimensions that are between 0.25" to 0.75.".
The nominal frequency for shear wave examinations on clad nozzles shall be 1
~ 0 MHz and on unclad nozzles the frequency shall be 2.0 - 2.25 MHz.
The nominal frequency for refracted longitudinal wave examinations shall be 20 - 2 ~ 25 MHz.
4.3.6.2 Zone 5 examinations require an angle beam wedge design that is the single angle beam type.
The wedges may be contoured to the curvature of the safe end OD.
If contoured wedges do not conform to the calibration block OD surface, they shall be calibrated as compound angle beam wedges.
4.3.6.3 Wedges shall produce shear wave beam angles of a nominal 45
- 70 at the inside surfaces for carbon'steel nozzles/safe ends.
For non carbon steel safe ends, wedges used shall produce refracted longitudinal waves of a nominal 45
- 70't the inside surfaces.
4.4 Wedges other than stated above may be used provided that the technique has been proven through testing to have desirable advantages.
4.5 Coaxial cables of any convenient length may be used for the examination.
The length, type of cable, and number of connectors shall be recorded on the Calibration Data Sheet.
4.6 The ultrasonic couplant to be used shall be in sufficient quantities to maintain adequate acoustic contact between the search unit and component and shall be in accordance with paragraph 2.10.
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 7 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 4.7 Calibration Blocks 4.7.1 Calibration Blocks shall be approved and lor provided by the plant owner.
4.7.2 Basic ASME Code Vessel calibration block is used for Zones 1, 2A, 2B, 3 and 4A.
The Safe end calibration block is used for Zones 4B and 5. The appropriate thickness calibration block of the plant nozzles to be examined shall be supplied or approved by the Owner.
4.7.3 The GE nozzle inner radius transfer block may be used in lieu of the ASME Code vessel calibration block.
This block is a 6" thick section of ASTM 516 GR 70 low alloy carbon steel.
This block has an EDM notch that is 0.125" deep by
.010 " wide and 1" long on the inner surface.
This block was used in the qualification testing of the clad removed feedwater nozzle mockup.
4.7.4 An IIW-2 block or equivalent may be used as a reference block for sweep calibration.
4.8 A thermometer calibrated and certified in accordance with the manufacturer's standards shall be used to measure the calibration block and examination component surface temperatures.
5.0 CALIBRATION 5 ~ 1 General Requirements 5.1
~ 1 Calibration for the examination shall include the complete UT system.
Any change in search units, couplants, UT instruments, or any other components of the system (except changes as permitted by this procedure) shall be cause for a calibration check.
Calibration for the examination shall be conducted on the appropriate calibration block.
5.1.2 The temperature of the basic calibration block shall be within a 25'F of the component surface temperature.
The calibration block used shall be heated or cooled as necessary to meet the 25'F requirement.
5.1.3 Calibration shall be verified at the start and finish of each series of examinations and at intervals not to exceed twelve hours.
Calibration may be verified on the calibration block, or by means of a simulator such as the IIW-2 block.
Any type of block may be used as a simulator provided that it contains sufficient reflectors so that at least two points on the sweep can be observed without changing the sweep range and delay controls from the calibration settings.
If a simulator is used, the response must be recorded at the time of initial calibration, for reference at the time of verification.
5.2 Instrument linearity calibration shall be performed at the beginning of each period of extended use, at least every three (3) months during use, and a final linearity shall be performed at the completion of a period of examination (ie. completion of an ISI).
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 8 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 5.3 Instrument Calibration 5.3.1 Sweep Calibration 5.3.1.1 Single angle beam wedge
- An initial instrument sweep calibration shall be made using the examination search unit and wedge with the IIW or DSC Calibration Block.
5.3.1.2 Compound angle beam wedges
- An initial instrument sweep calibration shall be made using the examination search unit with a conventional 45~,
60'r 70'nit and the IIW or DSC Calibration Block.
The selection of the conventional wedge shall be the next highest wedge above the examination angle.
5.3.1.3 The sweep adjustment shall be established to allow observation of the entire volume (nozzle bore) plus I/4 T (wall thickness).
5.3.2 Sensitivity Calibration 5.3.2.1 I
Calibration for the examination shall be established on the Owners code calibration block (with the exception of paragraph 4.7.3 ).
The ID surface notch shall be detected and the peak signal amplitude shall be adjusted to 80% FSH (+10%
-0%).
5.3.2.2 For calibrations using compound angle beam wedges, remove the transducer from the conventional calibration angle beam wedge after the
.sensitivity calibration is completed and attach it to the compound angle wedge
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5.3.2.3 Zone 2 single beam technique calibration per paragraph 4.3.2.4 shall be established on the Owners code calibration block.
The 1/4T side drilled hole shall be detected and the peak signal amplitude shall be adjusted to 80% FSH (+ 1 0%, -0%).
5.4 Calibration Verification 5.4.1 Acceptance criteria for calibration verifications checks are as follows:
5.4.1.1 Amplitude - If the amplitude of the reference reflector has changed by more than - 2 dB, all data sheets since the last calibration check shall be marked as void.
A new calibration shall be made and recorded and the voided examination areas shall be re-examined.
If the amplitude of the reference reflector has changed by more than +2 dB, all data since the last calibration shall be corrected.
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 9 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 5.4. 1.2 Sweep Range
- If the indication from the calibration reflector has moved on the sweep line more than 10% of the sweep reading or 5% of full sweep, whichever is greater, correct the sweep range calibration and note the correction on the calibration data sheet.
If recordable reflectors are noted on the examination data sheets, those data sheets shall be voided and a new calibration shall be made and recorded and the voided examination areas shall be re-examined.
5.5 All calibration and calibration verification data shall be recorded on the Calibration Data Sheet.
6.0 EXAMINATION 6.1 The thermal insulation shall be removed from the vessel, nozzle and safe end so as to create a free space for scanning.
Typically 12" radially out from the nozzle cylinder is sufficient.
Clearances less than 12" shall be noted in the examination record for information.
6.2 All accessible scanning surface shall be scanned with'a minimum overlap of 50% of the search unit active element size.
Areas where scanning'limitations exist shall be noted on the examination record.
6.3 The examination surface shall be clean and free of dirt, dust, weld spatter, or other material which would interfere with free movement of the transducer or impair transmission of ultrasonic energy into the material
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Unacceptable surface conditions shall be reported to the customer for disposition.
6.4 Rate of search unit movement shall be slow enough that careful observation of the UT signals are maintained and shall not exceed 3.0" per second.
6.5 Scanning shall be performed at a minimum of +6 dB above the reference sensitivity.
When the inner surface is clad, the gain shall be adjusted to obtain cladding signals between 20 - 30% of FSH.
When the inner surface is unclad, the gain shall be adjusted to obtain ID surface signals between 5 - 10% of FSH
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 10 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 6.6 Technique for Zone 1
6.6.1 The nozzle inner radius area shall be examined to the fullest extent possible using the vessel wall or the nozzle OD blend radius as illustrated in Figure 2 Scanning shall be as required by the technique used
( i.e. vessel or nozzle OD blend radius surface)
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Scanning shall be performed in both the CW and CCW directions.
2 Figure 2 Zone 1 Examination 6.6.2 When scanning is performed from the vessel OD surface as shown in transducer position 1 of Figure 2, follow a continuous line around the nozzle so as to cover a radial path, 4.0" minimum length, outward from the nozzle OD blend radius.
The scanning shall progress either circumferentially around the nozzle using a fixed rotation (skew), or by rotating the wedge.
With either scanning motion, the signal from the nozzle inner radius must be observed at least once each 3.0" increment of circumferential movement.
6.6.3 When scanning is performed from the nozzle OD blend radius surface as shown in transducer position 2, a zigzag scan pattern shall be followed around the nozzle OD blend radius.
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 11 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 6.7 Technique for Zone 2 6.7.1 The nozzle bore Zone 2 examination area shall be examined to the fullest extent possible from the nozzle OD blend surface as illustrated in Figure 3.
Figure 3 Zone 2 Examination 6.7.2 Scanning shall be in two directions, CW and CCW.
A zigzag scan pattern shall be followed around the nozzle OD blend radius.
6.7.3 Penetration of the sound beam shall be verified by observing the noise signal level above the horizontal sweep trace.
The noise indications will be concentrated on one area of the CRT and vary in both amplitude and time position as a scan is made across the nozzle OD blend radius.
6.7.4 When the scan of the Zone 2A is performed per paragraph 4.3
~ 2.4, the scanning is performed from the vessel OD surface as shown in transducer position 1 of Figure 2.
Follow a continuous line around the nozzle so as to cover a radial path, 4.0" minimum length, outward from the nozzle OD blend radius.
The scanning shall progress either circumferentially around the nozzle using a fixed rotation (skew), or by rotating the wedge.
With either scanning motion, the signal from the nozzle inner radius or bore must be observed at least once each 3.0" increment of circumferential movement.
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o GE Nuclear Energy No:
LIT-NMP-311VO Revision No.: 0 Page 12 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 6.8 Technique for Zone 3 6.8.1 The nozzle bore Zone 3 examination area shall be examined to the fullest extent possible from the nozzle OD cylindrical surface as illustrated in Figure 4.
The search unit shall be directed circumferentially around the nozzle OD surface.
Figure 4 Zone 3 Examination 6'.2 Scanning shall be in both the CW and CCW directions.
The entire nozzle OD cylindrical surface of the forging shall be inspected and the scanning extended onto the nozzle OD blend radius until the loss of contact amounts to 50% or more of the available area under the transducer scanning surface.
6.9 Technique for Zone 4A 6.9.1 The nozzle bore Zone 4A area shall be examined to the fullest extent possible using the nozzle OD taper surface for scanning as illustrated in Figure 5.
Figure 5 Zone 4A Examination
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o GE Nuclear Energy No:
LIT-NMP-311VO Revision No.: 0 Page 13 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 6.9.2 The search unit shall be scanned around the nozzle OD taper surface.
Scanning shall be in both the CW and CCW directions.
The entire nozzle OD taper surface of the forging shall be inspected and the scanning extended onto the nozzle-to-safe end OD blend radius until the loss of contact amounts to 50% or more of the available area under the transducer scanning surface.
6.9.3 The scanning shall progress either circumferentially around the nozzle using a fixed rotation (skew), or by rotating the wedge.
With either scanning motion, the signal from the nozzle bore must be observed at least once each 3.0" increment of circumferential movement.
6.10 Technique for Zone 4B 6.10.1 The nozzle bore Zone 4B examination area shall be examined to the fullest extent possible from the nozzle-to-safe end OD blend radius as illustrated in Figure 6.
Figure 6 Zone 4B Examination 6.10.2 Scanning shall be in two directions, CW and CCW.
The zigzag scan pattern shall be followed around the nozzle-to-safe end OD blend radius.
6.10.3 The scanning technique of the Zone 4B area is similar to that of the Zone 2 exam from the nozzle-to-vessel blend radius except the scanning is performed from the nozzle-to-safe end blend radius.
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o GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 14 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 6.11 Technique for Zone 5 U
6.11.1 The nozzle bore Zone 5 examination area shall be examined to the fullest extent possible using the safe end OD cylindrical surface for scanning as illustrated in Figure 7 ~
Figure 7 Zone 5 Examination 6.11.2 The search unit shall be directed circumferentially around the safe end OD and adjacent nozzle surfaces.
The entire safe end OD surface shall be inspected and the scanning extended onto the nozzle-to-safe end OD blend radius until the loss of contact amounts to 50% or more of the available area under the transducer scanning surface.
6.11.3 Scanning shall be in both the CW and CCW directions.
The scanning technique of the Zone 5 area is similar to that of the Zone 3 exam except the scanning is performed from the safe end OD cylindrical surface.
7.0 RECORDING 7.1 Data Recording 7.1.1 The recording criteria for clad nozzles shall be any signal response 40% FSH with the signal from the clad of approximately 20% - 30% of FSH and on unclad nozzles 20% FSH.
The signals to be recorded must have some metal path movement and have a signal-to-noise ratio of 2-to-1 as observed by the operator.
7 ~ 1.2 Indications in the region of the inside blend radius and bore which exceeds the recording criteria at the primary reference level (IX) and travel in time position on the CRT as opposed to clad noise which exhibits little (if any) time change shall be recorded on the Examination Data Sheet.
Recordable indications shall be reported in amplitude % FSH, metal path, search unit direction (CW or CCW),
and search unit centerline position.
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 15 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 7.1.3 Reference points for physical measurements shall be in accordance with the nozzle reference plan.
7.1.4 The transducer distance ("D") (Figure 8) shall be referenced to the appropriate reference point.
For transducer positions for scans on the vessel or safe-end surface may be either positive or negative.
This value is dependent on which side of the reference line the transducer is positioned.
7.1.4.1 For transducer positions ("D") on the vessel wall the reference point is the "vessel reference point". For transducer positions on the safe end OD the reference point is the "safe end reference point". For transducer positions on the nozzle OD blend radius, nozzle OD, nozzle taper to safe end blend radius the reference point is the "nozzle reference point" (Figure 8).
7.1.5 The "W" azimuth position (Figure 8) of the transducer shall be measured from 0 degrees (TDC). The "W" measurement will be taken on the nozzle OD cylindrical surface for all scans (Zones 1, 2A, 2B, 3, and 4a) except the safe end scan (Zones 4B and 5) which will be taken from the safe end OD surface.
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transducer positions between 0'- 180',
the value of "W" is a positive value and transducer positions between 180
- 360, the "W" value is a negative.
7.1.6 The maximum amplitude response point and amplitude value from the indication shall be identified.
All amplitudes shall be reported in terms of % FSH.
The following information shall be recorded on the Examination Data Sheet:
7.1.6.1 At the maximum amplitude point for the reflector record:
a) b)
c) d)
Transducer direction Transducer positions Reflector metal path Amplitude as % FSH 8.0 EVALUATION 8.1 All recorded indications shall be evaluated.
8.1.1 Indications detected from both the CW and CCW direction which also can be shown and located in the same location from two directions on a geometrical plot of the nozzle, shall be called a crack.
8.1.2 Any indication detected from one direction requires further evaluation.
This will consist of a rescan of the nozzle from the opposite direction and any signal detected with a signal-to-noise ratio of 2 or greater, regardless of amplitude, will be recorded and geometric plots will be prepared to determine if the indications are located in the same area, and if so, the indication shall be called a crack.
8.1
~ 3 Indications accompanied by tip-diffracted signals shall be called flaws.
8.2 Indications which are evaluated as cracking shall be sized in accordance with paragraph 2.8.
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 16 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE 8.3 Evaluation of Indications - All relevant inside surface indications shall be evaluated to the acceptance criteria specified in ASME Section XI, paragraph IWB 3512 and forwarded to the Owner.
8.4 Final acceptance and subsequent dispositioning of flaw indications is the responsibility of the Owner.
9.0 REPORTING 9.1 Calibration Data Sheet - The system calibration information shall be recorded on the Calibration Data Sheet and shall include as a minimum, the following information:
a) b)
c) d)
e) f)
g) h)
i) j)
k)
I) m)
n) o)
p) q)
r)
Calibration Data Sheet number Date of Calibration Examiner's Signature and NDE Level Ultrasonic Instrument Model number Ultrasonic Instrument Serial number Ultrasonic Instrument settings Transducer frequency, size, beam angle, and mode of wave propagation in the.
material.
Transducer serial number and manufacturer Search unit cable type, length and number of connectors Couplant (type and batch number)
Examination procedure number and revision Calibration standard number Times of initial calibration and subsequent calibration checks Calibration reflector (hole or notch)
Orientation of calibration reflector (axial or circumferential)
Amplitudes and sweep readings obtained from the calibration reflectors Thermometer serial number Calibration Block temperature 9.2 Examination Data Sheet
- All examinations shall be recorded on the Examination Data Sheet and shall include as a minimum the following information:
a) b)
c) d)
e) f)
g) h)
i) j)
Examination data sheet number Date and time period of examination Examination procedure and revision Applicable Calibration Data Sheet number Examiner's signature and NDE Level Identification and location of weld or volume scanned (for example marked up drawing or sketches)
Record of indications or volume free of indications Surface from which examination is conducted
'he information detailed in paragraph 8.1 for recorded indications Component temperature 9.3 The Nozzle Examination Plan described in paragraph 1.5 shall be included as an attachment to the examination data sheet(s).
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GE Nuclear Energy No:
UT-NMP-311VO Revision No.: 0 Page 17 of 17
Title:
PROCEDURE FOR MANUALULTRASONIC EXAMINATION OF NOZZLES INNER RADIUS AND BORE SAFE END REFERENCE POINI'o-I f
-~D NOZZLE REFERERCE POINT VESSEL REFERENCE POINT hlOZZLE OD 270'AFE END OD 180'IGURE 8
ENCL UIM5 REACTOR PRESSURE VESSEL FEEDYVATER A2'G) CONTROL ROD DRIVE RETUIW LPK NOZZLE EXAMINATIONS