ML20215B755
| ML20215B755 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/24/1986 |
| From: | WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | |
| Shared Package | |
| ML20215B717 | List: |
| References | |
| QCI-6-4, NUDOCS 8612120303 | |
| Download: ML20215B755 (21) | |
Text
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O no.
QCI 6-4 WASHINGTON PUBLIC POWER SUPPLY SYSTEM nEv.no.
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3 NDE & I INSTRUCTION
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2 QUALATV AFFEcTING YES MO TITLE ULTRASONIC EXAMINATION BWR N0ZZLE INNER RADIUS
'O 1.0 PURPOSE AND SCOPE 1.1 This procedure defines the requirements for manual, pulse-echo ultrasonic examination of the BWR nozzle inner radius, (Zones 1, 2, and 3), ASME Section XI, Category B-D.
Scanning by this pro-
.O cedure is done from the reactor vessel 0.0. wall and nozzle sur-faces using refracted shear wave search units. Figure 1 illus-trates the Zones which can be effectively scanned from the outside surfaces of the vessel plate and nozzle.
1.2 This procedure covers the angle beam shear wave technique that is O
unique to the nozzle design. Specific refraction angles have been determined by individual nozzie geometry as depicted in Figures 2, 3 and 4.
1.3 This instruction is intended to meet the requirements of Sections Y and XI of the ASME Boiler and Pressure Vessel Code (1980 with O(
Addenda through Winter 1980).
1.4 BWR Calibration Data listed in Table I have been predetermined l
from the Supply System's feedwater nozzle mockup so the qualified i
examiner need only use the vessel calibration block representing I
the shell course containing the nozzle.
O
- 2. 0 DEFINITIONS
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None.
l
- 3. 0 REQUIREMENTS O
3.1 Personnel Qualifications 3.1.1 Personnel performing examinations to the requirements of this instruction shall be a certified to at least Level II, in ultrasonics in accordance with the requirements of Reference 6.2 and (b) below.
Supply System personnel
,O shall be (a) certifled to at least Level II in accordance with Reference 6.3 and (b) qualified using the Supply l
System BWR feedwater nozzle mockup and this ultrasonic l
examination procedure.
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O 3.1. 2 At least one person responsible for reviewing the results of the ultrasonic examination shall be a Supply System person certified as an ultrasonic Level III in accordance with Reference 6.3 in addition to meeting the requirements of (b) above.
- O
- 3. 2 Radial Clearance The thermal insulation should be clear of the nozzle and vessel to create a free space 12 inches out from the nozzle cylinder outer j
surface.
!O
- 3. 3 Equipment 3.3.1 The pulse-echo, ultrasonic, flaw detection instrument shall be equipped with a fine gain or attenuation control graduated in units no larger than 2 dB.
Instruments con-o sidered acceptable for this examination are listed below;
}
however, other instruments may be used if the model type has been qualified.
Krautkramer USIP-11 Nortec NDT 131 or 131D O
3.3.2 Single element ceramic transducers, 3/4" x 1", with a nominal frequency of 2.25 MH shall be used with specific wedges, Figure 5.
The refracted angle within the material shall be within the limits shown in Table I.
Addi tion-ally, data may be taken with other sizes, frequencies, and angles, after completing the examination to the above O
requirements.
3.3.3 Ultragel II or its equivalent shall be used as the liquid couplant.
3.3.4 The vessel calibration standard listed in Table I shall be O
used. This standard corresponds to the shell thickness containing the subject nozzle.
3.3.5 IIW-2 ROMPAS or modified Type DC (square ended semi-circle) sweep calibration reference blocks.
O 3.3.6 Flashlight for reading instrument control knobs.
3.4 Surface Preparation The contact surface shall be clean and free of dirt, dust, weld spatter, loose paint, or other material which would interfere with o
free movement of the transducer or impair transmission of ultra-sonic energy into the material.
Page 2 of 20 0
- O QCI 6-4
/
Rev. 3 k
- O 3.5 Scanning Speed Limit The scanning speed shall not exceed 3 inches per second.
3.6 Nozzle Indentification
- O Prior to the examination, the nozzles shall be marked and identi-fied in accordance with a nozzle marking plan as illustrated in Figure 6.
Carter's marks-a-lot broad tip marker is the accepted pen device.
'o 3.7 General Requirements for Calibration Calibration shall include the complete ultrasonic examination sys tem. Any change in couplants, cables, or ultrasonic instru-ments shall be cause for recalibration.
Sweep calibrations may be made with a standard angle beam wedge using the IIW or similar
'O curved block, and must be representative of the metal path expected for the zone to be examined, reference Table I.
3.7.1 Instrument Calibration - prior to the initiation of scheduled examinations, the ultrasonic instrument shall be checked for amplitude control linearity per paragraphs 3.7.2 and 3.7.3, respectively.
3.7. 2 Amplitude Linearity Check - An angle beam search unit shall be positioned on a calibration block and signals obtained from two reflectors. The search unit position shall be adjusted to give'a 2:1 ratio of amplitudes
~
between the two reflectors. The gain control (sensitiv-
'O ity) shall be adjusted and the larger signal brought to 80% of full screen height (FSH), adjusting position if necessary te maintain the 2:1 signal ratio. Wi thout moving the search unit, adjust the gain control to succes-sively set the larger signal from 100% to 20% FSH in 10%
increments or 2 dB steps. The smaller amplitude must be
- O 50% of the larger amplitude within 5% of FSH.
Instruments that do not meet these requir ements shall not be used.
3.7.3 Amplitude Control Linearity Check - The angle beam search l
unit shall be positioned on a calibration block and a l
peaked signal amplitude obtained from a hole or notch.
O The indication shall be brought as near as possible to 80%
FSH with the d8 control.
If necessary, the final adjust-ment to 80% FSH is made with the variable gain control or i
I dB switch. Using only the dB control, the dB changes j
indicated below shall be made and the resulting amplitude compared with the allowable amplitude limits as specified bel w.
Instruments that do not meet these limits shall
- O j
not be used. The procedure shall be repeated for 40% and
(
20% FSH amplitudes.
l Page 3 of 20 0
u
O QCI 6-4 Rev. 3 O
Initial Ampiitude dB Contrel Amp 1itude Limits Set of % FSH Change
(% FSH)
O 80
-6 32 to 48 80
-12 16 to 24 40
+6 64 to 96 20
+12 64 to 96 0
3.7.4 Recalibration (Sweep Only) - If the indication from the calibration reflector has moved on the sweep ifne more than one inch of metal path, correct the sweep range cali-bration and note the correction on the calibration data sheet. If recordable reflectors are noted on the examina-O tion data sheets, those data sheets shall be voided. A i
new calibration shall be made and recorded, and the voided
- examination areas shall be re-examined.
3.7.5 Recalibration (Amplitude Only) - If the amplitude of the calibration notch has changed by more than 10% FSH when a O
check is made on the reference block, all data sheets since the last positive calibration check shall be marked void. A new calibration shall be recorded and the voided examination areas re-examined. The voided sheets may be discarded.
,0 Calibration shall be performed at the beginning of each series of examinations.
A calibration verification shall be made at intervals not exceeding four hours during the examinations.
- 4. 0 CALIBRATION AE EXAMINATION lO 4.1 Sweep Calibration An initial instrument sweep calibration shall be made for shear wave velocity by using the examination search unit with a conven--
tional angle beam shear wave wedge and the IIW, Rompas or modified DC type curved calibration block. Sweep calibration data is O
listed in Table I for each nozzle. The oscilloscope's screen shall read directly in inches of metal psth and the data entered on the calibration data sheet, Figure 7.
4.1.1 Zone 1 - Using a Rompas block, direct the ultrasonic beam toward the large radius, with the exit point of the trans-O ducer at the radius center mark on the block, maximize the CRT signals by moving the transducer forward and back.
I Page 4 of 20 0
~O QCI 6-4 g
Rev. 3 O
Adjust the " Range" and " Delay" controls until the first reflection signal is at "2" on the horizontal graticule line on the CRT and the following signals appear at "5" and "8".
Lock the range control knob and delay the signal at "8" to zero position.
Signals should now appear at
! O zero, 3, 6 and 9.
Next, delay the signal at 6 to zero.
Signals should again appear at zero, 3, 6 and 9.
If they do not, make minor adjustments so they do. The _CRT is now calibrated for 14 to 24 inches of metal path.
4.1. 2 Zone 2 - Using the transducer with the convex 25* shear O
wedge, obtain peaked signals from the 1/2 to 3/4 "T" holes in calibration block No.120. Adjust the range and sweep to obtain reflection signals at positions 3.5 and 5.4.
Delay the sipial at 5.4 to the 0.4 position. The CRT is now calibrated for 5 to 15 inches of metal path.
4.1. 3 Zone 3 - Using the transducer with the flat 25* shear
- O wedge, calibrate as in 4.1.2.
4.2 Amplitude Calibration. Basic calibration shall be established with sufficient gain so that 2X scanning can be performed without changing the variable gain control. To determine the basic sensi-tivity level of 1X, the search unit shall be held on the app 11-
,O(
cable vessel calibration standard, with the echo amplitude from
+
the side drilled hole at 3/4 T maximized. The gain controls shall now be adjusted so that the echo amplitude is brought to 507, FSH.
The gain (control) shall then be increased by the nunber of dB listed in Table I.
~O CAUTION: Care must be exercised during calibration to assure the shear wave component is used for calibration since there is also a strong longitudinal wave component generated by the angle beam transducer, especially for Zone 2 and 3 calibration. A peaked shear wave signal from the 3/4 T hole should appear at approxi-mately 5.7 inches metal path when the transducer is approximately O
2-3/8 inches surface distance from a Ifne normal to the hole centerline. The refracted longitudinal wave should produce a peaked signal at approximately 4-3/4 inch metal path at a surface distance of 6-1/2 inches.
4.3 Examina tion O
A Level II or III UT examiner shall view the CRT display during the examination. A record of each nozzle inner radius examination shall be made on examination data sheets (Figure 8), which shall be numbered in sequence with calibration data sheets. Scanning shall be performed at 2X above the primary gain level (1X).
Measurement and recording of ultrasonic indications shall be done O
at the 1X 1evel.
Page 5 of 20 0
'O QCI 6-4 Rev. 3
{
O Zone - 1 The inner radius Zone 1 shall be scanned in two directions from the vessel plate as shown in Figure 9.
Scanning shall progress circumferentially around the nozzle using the moving azimuth tech-
"O nique. The operator shall occasionally rotate the wedge toward the bore axis to obtain a direct reflection signal from the inner radius as a check to confirin penetration.
A secondary technique may be used in addition to the moving azimuth technique, the scan-ning shall follow a continuous line around the nozzle using a fixed azimuth. A minimum of three scans shall be made as shown in
- O Figure 9 (0.5 in, overlap). The movable pointer on the transducer wedge shall be positioned in the groove marked "CCW" for scanning counter clockwise and "CW" for scanning clockwise. The pointer shall be aimed at the nozzle bore axis during scanning to the extent practicable. The examiner shall reference Figure 10 for transducer orientation.
- O Zone - 2 The inner surface of the nozzle shall be scanned from the exterior surface of the nozzle using the appropriate search units in two directions:
clockwise (CW) and counterclockwise (CCW) (Figure 11). A circumferential scanning pattern spaced at intervals not
- O exceeding 0.25 in. (3/4 in. overlap) shall be followed around the x
nozzle body to obtain full coverage of the inner surface Zone 2.
Zone - 3 The nozzle forging and the inside bore shall be examined to the
- O maximum extent possible using the cylindrical surface for scanning (Figure 12).
The scan path of the search unit shall overlap the adjacent scan by a minimum of 0.50 inch. The search unit shall be 4
i scanned circumferential1y around the nozzle forging so the angle beam shear wave covers all 360* of the circumference in both the clockwise and counterclockwise directions.
- O 4.4 Data Recording Indications in the region of the blend radius which have an ampli-tude greater than 50% FSH at the 2X scanning level and which travel in time pcsition on the CRT shall be investigated to deter-
! O mine maximum amplitude.
Indications in the region of the blend radius which exceed 25% FSH at the primary reference level (1X) and which travel in time post-tion on the CRT, shall be recorded on the examination data sheet.
Report signal amplitude in % FSH, metal path in inches, search
'O unit direction as clockwise (CW) or counterclockwise (CCW), and search unit position.
Page 6 of 20
- O
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- O QCI 6-4
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Rev. 3 4
- O 4.5 Reference Points for Physical Measurement Reference points for physical measurement of azimuth shall be in accordance with the nozzle reference plan shown in Figures 10,11, and 12.
4.6 CRT Display Photos Photos of the CRT display shall be taken at the option of the Level III Examiner to further document the ultrasontc signal character. Pertinent data shown below shall be recorded on the back of each photo.
O
- 1. Report No.
- 2. ISI Drawing No.
- 3. Zone No.
- 4. Sweep Distance
- 5. Indication No.
- 5. 0 DATA PROCESSING S.1 The recorded data shall be reviewed by a level III Examiner to detemine if additional examination and/or interpretation is required.
'O(
5.2 Recorded indications shall be plotted on a scale no less than quarter size and reviewed by the Level III Examiner.
6.0 REFERENCE O
6.1 American Society of Mechanical Engineers Boiler and Pressure Vessel Code,1977 Edition through Sumer 1978 Addenda.
6.1.1 Section XI
" Rules for Inservice Inspection of Nuclear Power Plant Components".
!O 6.1. 2 Section V - Nondestructive Examination".
6.2 American Society for Nondestructive Testing, June 1975 Edition.
Recommended Practice SNT-TC-1 A " Nondestructive Testing Personnel Qualification and Certification".
6.3 The Supply System " Program Manual for Qualification and Certifica-
- O tion of Examination, Testing and Inspection Personnel WMC-034".
6.4 Nozzle forging drawings - General Electric /CBI Nuclear
.O Page 7 of 20
,O,
O QCI 6-4 Rev. 3 O
TABLE I ULTRASONIC CALIBRATION DATA FOR EXAMINATION OR BWR N0ZZLE INNER RADII O
N0ZZLE TYPE - N4 FEEDWATER ACOUSTIC ANGLES CRT CAL TRANSFER l
DEGREESI DISPLAYED STANDARD SENSITIVITY A
B C
SWEEP dB GAIN INCREASE l
O Zone 1 22 70 70 14" to 24" UT 1202 14 Zone 2 22 253 63-70 5" to 15" UT 120 12 Zone 3 0-10 25 63 5" to 15" UT 120 12 0
1.
See Figures 2A, 28, 3 and 4 2.
The 5/16 in, dia., 3/4 T hole (5.06 in below the contact sur-face) shall be used for calibration.
O 3.
Convex shoe s
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O O
Page 8 of 20 0
QCI 6-4 Rev. 3 0
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.O N0ZZl.E EXAMINATION ZONES O
'O FIGURE 1 i
Page 9 of 20
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O QCI 6-4 Rev. 3 O-Vessel Plate Nh
- O Scan Width s
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Scan Start i
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FOR ZONE 1 i
O A = Skew Angle (offset)
B = Refracted Angle C = Intercept Angle O
ultrasonic Search Unit Assembly with Compound Angle s
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Page 10 of 2G Figures 2A and 2B o
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'O 0F N0ZZLE FIGURE 3 SOUND BEAM GEOMETRY, BODY ZONE 2 O(
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- O FIGURE 4 SOUND BEAM N0ZZLE CYLINDER GEOMETRY ZONE 3 FIGURES 3 and 4 g
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- O N0ZZLE NUMBER
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- O FIGURE 6 N0ZZLE MARKING PLAN Page 13 of 20 10
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