ML20066K045
| ML20066K045 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 03/28/1989 |
| From: | Tompkins P WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | |
| Shared Package | |
| ML17286A569 | List: |
| References | |
| QCI-6-4, NUDOCS 9102050187 | |
| Download: ML20066K045 (21) | |
Text
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4 NO.
OCI 6-4 p.... m........,.....
W SUPPLY SYSTEM 7
5 NDE & I INSTRUCTION
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3 QU ALITY AFFECTINQ Oves Owo TIT LS ULTRASONIC EXAMINATION FEE 0 HATER N0ZZLE INNER RADII 1.0 PURPOSE AND SCOPE 1.1 This procedure defines the requirements for manual, pulse-echo ultrasonic examination of the feedwater nozzle inner radius, (Zones 1, 2, and 3), ASME Section XI, Category B-D.
Scanning by this procedure is done from the reactor vessel 0.D. wall and nozzle surfaces using refracted shear wave search units.
Figure 1 illustrates 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 unique to the nozzle design. Specific refraction angles have been determined by individual nozzle geometry as depicted in Figures 2, 3 and 4, 1.3 This instruction is intended to meet the requirements of Sections V and XI vf the ASME Boller and Pressure Vessel Code (1980 with Addenda through Winter 1980).
1.4 BHR Calibration Data listed in Table I have been predetermined from the Supply System's feedwater nozzle mockup so the qualified exam-iner need only use the vessel calibration block representing the shell course containing the nozzle.
2.0 DEFINITIONS None.
3.0 REOUIREMENT_S 3.1 Personnel Oualifications 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 Refer-ence 6.2 and (b) below.
Supply System personnel shall be (a) certified to at least Level II in accordance with Reference 6.3 and (b) qualified using the Supply System BHR feedwater nozzle mockup and this ultrasonic examination procedure.
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3.1.2 Personnel not specifically qualified on the DNR feedwater nozzle mock-up, but designated as Trainee, Level I, II or III UT may assist a quallf ted examiner in performance of examinations to this instruction.
3.1.3 At least or.e person responsible for reviewing the results of the ultrasonic examination shall be a Supply System person 1
certified as an ultrasonic Level !!! in accordance with Reference 6.3 in addition to meeting the requirements of (b) above.
3.2 Radial Cleat mC1 The thermal Insulation should be clear of the nozzle and vessel to create a free space 12 inches out from the nozzle cylli. der outer surface.
3.3 Eautoment 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 considered accept-able for this examination are 11sted below; however, other instruments may be Jsed if the model type has been qualified.
Krautkramer USIP-11 USL-48, USD-10
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Nortec NDT 131 or 131D, 1320 3.3.2 Single element' ceramic transducers, having an area of.44 to 1.0 square inch, with a nominal frequency of 2.25 MHz shall be used with specific wedges, Figure 5.
The refracted angle within the material shall be within the limits snown-in Table I.
Additionally, data may be. taken wtth other sizes, frequencies, and angles, after completing the examination to the above requirements.
3.343 Ultragel II or its equivalent shall be used as tte liquid couplant.
3.3.4 The vessel ec11bration standard 11sted in Table I shall be used.
This standard corresponds to the shell thickness containing the subject nozzle.
3.3.5 IIW-2 ROMPAS or modified Type DC tsquare ended semicircle) sweep calibration reference blocks.
4 3.3.6 Flashlight for reading instrument control knobs.
1 Page 2 of 21 l-m
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QCI 6-4 Rev. 5 l
3.4 Surface Preoaration The contact surface shall be clean and free of dirt, dust, weld spatter, loose paint, or other material which would interfere with free movement of the transducer or impair transmission of ultra-l-
sonic energy into the material.
3.5 Scannina Soeed Limit The scanning speed shall not exceed 3 inches per second.
3.6 Hargle Indentir'ication Prior to the examination, the nozzles shall be marked and Identi-fled in accordance with a nozzle marking plan as illustrated in Figure 6.
Sanford's " Sharpie" black tip marker is the accepted pen device.
-3.7 General Requirements for Calibration Calibration shall include the complete ultrasonic examination system.
Any cha.7ge in couplants, cables, or ultrasonic instruments shall be cause for recalibration.
Sweep calibrations may be made with a standard angle-beam wedge using -the IIH or similar curved block, and must be representative of the metal path expected for the i
- one to be examined, reference Table I.
37.1 Instrument Calibration - Prior to the initiation of-scheduled examinations, the ultrasonic instrument shall be checked for 4
screen height and amplitude control linearity per paragraphs 3,7.2 and 3.7.3.
r 3.7.2. Screen Height (per ASME) Linearity Check - An angle beam search unit shall be positioned on a calibration block and signals obtained from two reflectors.
The search unit posi-tion shall be adjusted to give a 2:1 ratto of amplitudes between the two reflectors.
The gain control (sensitivity) shall' be adjusted and the larger signal brought to 80% 'f-full screen height (FSH), adjusting position if necesst: >
maintain the 2:1 signal ratio.
Without moving the. sap c, Unit, adjust the gain control to successively set-the'Is ger signal from 100% to 20% FSH in.10%-Increments or.2 dB.teps.
The smaller amplitude must be 50% of the larger amplitude within - S%~ of FSH.
Instruments that do not meet these-
-requirements shall not be used.
3.7.3 Amplitude Control Linearity Check - The angle beam search unit shall be positioned on a calibration block and a peaked signal amplitude obtained from a hole or notch.
The indi-cation shall be brought as near as possible to 80% FSH with i
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OCl 6-4 Rev, 5
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the-dB control.
If necessary, the final adjustment to 80%
FSH is made with the variable gain control or dB switch.
Using_only__the dB control, the d8 changes indicated below shall be made and the resulting amplitude compared with the allowable amplitude limits as specified below.
Instruments that do not_ meet these limits shall not be used.
The proce-dure shall be repeated for 40% and 20% FSH amplitudes.
Initial Amolitude dB Control Amolitude limits Set of % FSH thange
(% FSH) 80
-6 12 to 48 80
-12 16 to 24 40 -
+6 64 to 96 20
+12 64 to 96 3.7.4 Retainbration'(Sweep Only) - If the indication from the cali-bration reflector has moved on the sweep line more than one
- inch of metal path, correct the sweep range calibration and note the-correction on the calibration data sheet. If record-able reflectors are noted on the examination data sheets, k
those data sheets shall be voided. A new calibration shall be made and recorded, and the volded 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 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 volded examination areas re-examined.
The voided sheets may be discarded.
Calibration shall be performed at.the beginning of each series of examinations. A calibration verification shall'be i
made at in_tervals not exceeding four hours during the e xam ir..t lon s.
4.0 CALIBRATION AND EXAMINATION 4.1 -Sween Calibration An initial instrument sweep calibration shall be made for shear wave velocity by using the examination search unit with a conventional angle beam shear wave wedge !.nd the IIH, Rompas or modified DC type curved calibration block.
Sweep calibration data is listed in i.
Page 4 of 21
,e OCI 6 Rev. 5
=i Table I for each nozzle.
The oscilloscope's screen shall read directly in inches of metal path and the data. entered on the call-oration data sheet, Figure T.
4.1.1 Zone 1 - Using a Rompas block, direct the ultrasonic beam toward.the large radius, with the exit point of the trans-ducer at the radius center mark on the block, maximize the CRT signals by moving the transducer forward and back.
Adjust the " Range" and " Delay" controls until the first reflection signal is at "2" on the horizonte.1 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 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-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 signal at 5.4 to the 0.4 position.
The CRT is now
, calibrated for 5 to 15 inches of metal path.
4.1.-
Zone 3 - Using the transducer with the flat 25' shear wedge, calibrate as in 4.1.2.
4.2 Amolitude Calibration Basic calibrat*on gain sensitivity shall be determined by both the applicable veuel calibration block and the transfer sensitivity gain as shown in Table 1.
Basic calibration shall be established _
with sufficient gain so that 2X scanning can be performed without changing the vbriable gain control.
To determine the basic sensitivity level, the search _ unit _shall be held on the appilcable vessel calibration block with the signal amplitude from the 3/4 T-hole maximized.
The instrument gain con-trols shall then be adjusted so that the 3/4 T-hole signal amplitude is brought to 50% FSH.
This basic sensitivity level shall then be adjusted for each zone according to Table l's ' Transfer Sensitivity d8 Gain Increase." After adjusting to the-transfer sensitivity _ gain L
increase, the gain setting shall-now be the primary reference level L
of IX.. Examination scanning shall be at 2X b6 dBF above the prl-mary reference level.
EQI.E: As-shown in Table 1, Zone 1 requires no additional gain ad-justment after the 3/4 T-hole is maximized at 50% FSH to achieve the
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Nge 5 of 21
OCI 6-4 Rev. 5 primary reference level (see Note 4).
Transfer sensitivity _ gain is O for Zone 1._ However, for Zones 2 and 3 the primary reference gain level is an additional 12 dB over the 3/4 T-hole maximized at 50%-
FSH.
CAMIl08:
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 ar.;;c beam transducer, especially for Zone 2 and 3 calibration. A peaked shear wave signal from the 3/4 T hole should appear at approximately 5.7 inches metal path when the transducer is approximately 2-3/8 inches surface distance from a line normal to the hole centerline.
The refracted longitudinal wave should produce a peaked signal at approx-Imately 4-3/4 inch metal path at a surface distance of 6-1/2 inches.
4.3 Examination A Level II or III (H' examiner shall view the CRT display.during the examination. A record of each nozzle inner radius examination shall-be made on examination data she3ts (Figure 8), which shall be -num-bered In sequence with calibration data-sheets. Scanning shall be performed at 2X above the primary gain level (IX).
Measurement and recording of ultrasonic indications shall-be done at the IX level.
Zdnt - 1
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The inner radius Zone I shall be scanned in two directions (CH and CCH) from the vessel plate as shown in Figure 9.
Scanning shall be done in a circumferential or radial motion with a minimum overlap of 0.5 inches.
The moveable pointer on the transducer wedge shall be positioned in the groove marked "CCH" for scanning counter clockwise and."CH" for scanning clockwise.
While scanning, the pointer shall be aimed at the nozzle bore to the extent practical with the trans-ducer oscillated slightly.
The examiner shall reference Figure 9 l
for transducer orientation.
The scan boundarles extend from the end of the blend radius to a distance of 9 inches out on the shell wall.
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 confirm penetration.
Zone - 2
'The Inner surface of the nozzle shall be scar.ned from the exterior surface of the nozzle using the appropriate search units in two directions:
clockwise (CH) and counterclockwise (CCH) (Figure 11).
l A circumferential scanning pattern spaced at intervals not exceeding 0.25 in. (3/4 In. overlap) shall be followed around the nozzle body l
to obtain full coverage of the inner surface Zone 2.
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Zone - 3 The nozzle forging and the inside bore shall be examined to the 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 scanned circumferentially around the nozzle forging so the angle beam shear wave covers all 360' of the circumference in both the clockwise and counterclockwise directions.
4.4 Data RECREd1DS Indications in the region of the blend radius which have an ampil-tude greater than 50% FSH at the 2X scanning level and which travel in time position on the CRT shall be investigated to determine maximum amplitude.
Indications in the region of t5e blend radius which exceed 25% FSH at the primary reference level (lX) 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 unit direction as clockwise (CH) or counterclockwise (CCH), and search unit position.
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4.5 Referenc~e 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 Disolav Photgi Photos of the CRT display shall be taken at the option of the Level III Examiner to further document the ultrasonic signal character.
Pertinent data shown below shall be recorded on the back of each photo.
1.
Report No.
2.
ISI Drawing No.
3, Zone No.
4.
Sweep Distance 5.
Indication No.
5.0 Q&IA. PROCESSING 5.1 The recorded data shall be reviewed by a level III Examiner to determine if additional examination and/or interpretation is required.
5.2 Recorded indications shall be plotted on a scale no less than quarter size and reviewed by the Level III Examiner.
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OCI 6-4 Rev. 5
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6.0 REFERENCE 6.1 American Society of Mechanical Engineers Boiler $ad Pressure Vessel Code, 1977 Edition through Summer 1978 Addenda.
6.1.1 Section XI
" Rules for Inservice Inspection of Nuclear Power Plant Components".
6.1.2 Section V - Nondestructive Examination".
6.2 American Society for Hondestructive Testing, June 1975 Edition.
Recommended Practice SNT-TC-1A " Nondestructive Testing Personnel l
Qualification and Certification".
6.3 The Supply System " Program Manual for Qualification and Certifica-tion of Examination. Testing and Inspection Personnel HMC-034".
6.4 Nozzle forging drawings - General Electric /CBI Nuclear
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OCI0-4' Rev. 5
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TABLE I
-ULTRASONIC CALIBRATION DATA FOR-EXAMINATION OR BHR N0ZZLE INNER RADII I
N0ZZLE TYPE - N4 FEEDWATER
.ACOUSTICANglES CRT CAL TRANSFER DEGREES DISPLAYED STANDARD SENSITIVITY
-[
A B-C SWEEP dB GAIN INCREASE Zone 1 22 70 70 14" to 24" UT 1202 o
Zone 2 22 253 63-70 5" to 15" UT 120 12 Zone 3 0-10 25 63 5" :to 15" UT 120-12 1.
See Figures 2A, 28, 3 and 4 2.
The 5/16 in. dia., 3/4 T hole (5.06 in. below the contact surface) shall be used for calibration.
3..
Convex shoe; 1
NOTE:
The following is in reference to Zone I transfer f
sensitivity, a
4.
Gain setting for 501. FSH ' indication is 6 dB less for RFW nozzle mock-up notch (Notch A) than for 3/4 T-hole of call-
=bration s tandard.- UT-120.
Therefore, as a conservative measure, the 3/4 T-hole gain setting has been accepted as-the primary. gain level.
L l
L Page 9 of 21 lu-
OCI 6-4 Rev. 5 l
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.l lY 2
1 NOZZLE EXAMINATION ZONES FIGURE 1 Page 10 of 21
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. 20. SOUND BEAM GEOMETRY IN NOZZLE FOR ZONE 1
-FIGURES 2A and 2B
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Page 11 of 21
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SCAN C
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FIGURE 3 SOUND BEAM GEOMETRY ZONE 2 g
N B-C V
O ETRY NE SECTIONAL VIEW OF -
NOZZLE CYLINDER FIGURES 3 and 4 t
Page 12 of 21-
OCI 6-4 Rev. 5
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SIDE VIEWS END VIEWS
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s ZONE 2 CONVEX CONTACT SURFACE
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ZONE 3, CONCAVE CONTACT SURFACE FIGURE S TRANSDUCER HEDGE CONFIGURATIONS l
Page 13 of 21
a OCI 6-4 Rev.-5 I
i NOZZLE NUMBER g
LOCATED ON TAPER v
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LINES MARKED-
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I RADIAL LINES EXTEND AT LEAST 2* PAST REF CIRCLE e
345' 15 30' 30' l
45'
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300
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5' pX DISTANCE = CIELQUMFERENCE 24 g
270' o
90*
255 OS*
24 20*
225 35' 195 65' (BOTTOM)
FIGURE 6 N0ZZLE MARKING PLAN
- Page 14 of 21 l'
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OCI 6-4 Rev. 5
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FIGURE 7 Page 15 of 21
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ULTR ASONIC EXAMINATION OATA SHEET - fiOZ2LE INNER RADIUS neron e Noa EW,003... _...-...
scoJacti WNP.2 lsystaus Feed Water
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Page 16 of 21
4'
.o' REFER NCE CIRCLE QCI 6-4 Rev. 5 l.
O' 0*
315' 45' 300' 60' 285' 5'
270*
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240 20*
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FIXED AZlMUTH CIRCUMFERENTIAL MOVING AZIMUTH SCAN TECHNIQUE
$CAN TECHNIQUE SECONDARY PRIMARY
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CIRClifFERENTIAL MD PJ, DIAL SCfflHIt!G A
ZONE 1 REFERENCE CIRCLE ZONE 1 REFERENCE A CIR LE h ' '
SCAN-SCAN g
Xder Pointer k
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PATHS f
W Ref. h \\g Toward b0 SCAN IN CW AND CCW DIRECTION SCAN IN CW AND CCW DIRECTION CIRCUMFERENTIAL SCANNING MOTION RADIAL SCANNING MOTION FIGURE 9 SCANNING MOTIONS FOR THE ZONE 1 EXAMINATION Page 17 of 21
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OCI 6-4 Rev. 5 15'
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g, ZONE 1 45' REFERE CE CIRCLE 60' Y
5' i
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DIST NCE(D)
AZlMUTH (A) 75' REFERENCE CIRCLE NOTE:
ALL (A) MEASUREMENTS SHALL BE IN COUNTER CLOCKWISE DIRECTION FROM NEAREST RADIAL LINE.
ALL(D) MEASUREMENTS SHALL BE FROM REFERENCE CIRCLE RADIALLY OUTWARD.
FIGURE 10 HEASUREMENT CRITERIA FOR RECORDING UT
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..0C1 6-4 Rev 5-f A2(CCW) ! ( U 0
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For'O stance measurement
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Scan Width (x360')
Radius End
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//4 NOZZLE CROSS SECTION FIGURE 11 REQUIRED SCAN PATHS-AND MEASUREMENT CRITERIA FOR ZONE 2 EXAMINTIONS Page 19 of 21
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CIRCUMFERENTIAL SCANS SHALL -
BE MADE IN TWO DIRECTIONS AROUND THE CYLINDRICAL SECTION OF THE NOZ2LE FORGING f'
Y MEASURE *D' DISTANCES FORM r
BREAK POINT ON NOZZLE FORGING BETWEEN CONICAL AND CYLINDRICAL SECTIONS (TOP)
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J A2 v
SIDE W;N OF NOZZLE 270* _
. J. 90' A2 N
N
~'
180*
Reference A2 Ines are each 15'stound the nozzle, All A2 measurements are made in a counter <:lockwise drection trom these lines to the index mark on the search unit, Vow made loolung toward the vesset, FIGURE 12.
ZONE 3 SCANNING AND LOCATION REQUIREMENTS
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Page 20 of 21
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e OCI 6-4 Rev. 5 i
45 0
15 30 330 345 315 60 300 285 270 105 240 22 21 19 180 pu of endeswa) for nome %
Reoort b Sese 1 4 FIGURE 13 1
Page 21 of 21