ML20084P744
| ML20084P744 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/15/1983 |
| From: | Adamonis D, Efthymiou G, Kurek D WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20084P728 | List: |
| References | |
| RTR-REGGD-01.150, RTR-REGGD-1.150 ISI-154, NUDOCS 8405180371 | |
| Download: ML20084P744 (78) | |
Text
"
Westinghouse Water Reactor y;-;',j'5[;jy;.
Electric Corporation Divisions B:i272E P; De[* PerspW '!!i*
EXAMINATION PROCEDURE: 151-154 OCTOBER 5,1983 DATED:
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PLANT SITE: GENERAL
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APRO 6 REC.D
sd LTTILITY: GENERAL PROCEDURE TITLE: PRESERVICE AND INSERVICE INSPECTION OF REACTOR VESSELS REVISION 0 DATED: O'CTOBER 5,1982 REVISION 1 DATED: MARCH 16,1983 REVISION 2 DATED: DECEMBER 15, 1983
- A PREPARED BY: .
D. C. Adamonis, Level 111 REVIEWED BY: -
D. Kurek, Leve? Ill Inspection Senice APPROVED BY: 6b G. f.. EftAynlop, Manager Inspection Service 8405180371 040509 gDRADOCK05000 0
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T NSlQ .
0727W:42/121583 '151-154 Rev. 2 .
INDEX ,
i '
1.0 PURPOSE. !
I ;
2.0 SC0PE i 3.0 EQUIPMENT ,
i 4.0 PERSONNEL REQUIREMENTS ;
5.0 INSTRUMENT PERFORiiANCE CHECKS
. l 6.0 SYSTEM CALIBRATION .
I 7.0 EXA!!INATION. REQUIREMENTS t
8.0 INTERPRETATION AND INVESTIGATION ;
i 9.0 RECORDI." REQUIREMENTS _
j i
10.0 EXAMINATION RECORDS' f
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NSID' 0727b:42/121503 151-154 Rev. 2 PRESERVICE AND INSERVICE INSPECTION OF REACTOR VESSELS 1.0 PURPOSE 1.1 This document describes the equipment, calibration sequence, examin-l
. adon techniques, and recording requirements for preservice and inservice inspection of a reactor vessel with the remotely operated inspection tool. All operations described herein are intended to satisfy volumetric examination requirements of Section XI of the l ASME Boiler and Pressure Vessel Code. The plant specific Examination Program Plan prepared per RV-ISI-01, " Reactor Vessel Examination Program Preparation and Documentation", is considered part of this procedure and should be used as applicable.
I 2.0 SCOPE 2.1 This document provides general requirements for straight and angle beam immersion ultrasonic examinations of pressure retaining carbon and low alloy steel welds, nozzle safe end welds, heat affected !
zones, specified base material, and weld repairs to base material ,
I which exceed 10% of the nominal wall thickness in the reactor vessel beltline regions.
i 2.2 Specific calibration and examination requirements, i.e., areas selected for examination, extent of examination, search unit sizes, !
. angles, calibration standards, and water path distances, are defined in the plant specific Examination Program Plan.
3.0 EQUIPPENT ;
3.1 Examinations shall be performed using pulse-echo and/or transmit-receive. techniques with immersion water path coupling using the equipment listed below. ,
i !
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0727W:42/121583 l 151-154 Rev. 2 3.1.1 Sonic Mul.tichannel Tine - Amplitude Ultrasonic System, l i consisting o( the following modules and interconnects:
Pulser / Preamps Mark VI Mainframe /CRT
. Mark VI Receiver Mark VI Interface 1
~ '
System Controller Hardcopy Controller Gate Monitor Two Tektronix 613 Storage Scopes Data Display Tektronix 4613 Hardcopy Printer Power Supply Hodule Serial Data Link , l RG-174 Cable, 23 ft. i Four Tektronix 2213 Auxiliary Displays l l 3.1.2 Westinghouse Computer System Model 2500 3.1.3 Westinghouse MK-1 Electronic Block Simulator (EBS) ,
i ,
3.1.4 Ultrasonic Transducers 2.25 MHz, 1.50 inches diameter 2.25 MHz, 0.75 inches diameter !
1.0 MHz, 1.50 inches diameter ,
1.0 MHz, 0.75 inches diameter 5.0 tMz, 0.50 inches x 1.00 inches rectangular
. +
. i 3.1.5 Transducer array plates and transd'ucer mounting assemblies !
l
~
~3-.1.6 Ca'libration tank and manipulator t
3.1.7 Calibration block . <
i l
. ~
3.1.8 Mechanical Transfer Standard (MTS) l 3.1.9 Spherical "Home" Target EHtCi4E Arv SEC CA'E .' October-5, 1982 3 citt December-15, 1983 rict NSC 3C34 Rt v 2183
._ _ . ~ , . ._ _ . . , . _ . _ _ _ _ , _
h NSID, 0727W:42/121583 151-154 Rev. 2 l 3.2 Other transducers, calibration standards, and/or equipment may be used for special applications or where metallurgical characteristics or geomet'ry preclude effective use of the equipment described above.
These parameters shall be defined in the Examination Program Plan.
4.0 PERSONNEL' REQUIREMENTS 4.1 Ultrasonic test operators performing activities per this procedure shall be qualified and certified Level II or Level III per y PA 10.1 or equivalent procedure based on SNT-TC-1A, as supplemented by the requirements of Section XI. Individuals qualified and certified Level I or Level I Trainees per y PA 10.1 or equivalent procedure as described above may perform these activities under direct supervision of a Level II or Level III. All recordable indications !
shall be evaluated by a Level II or Level III individual.
i 5.0 INSTRUtENT PERFORMANCE CHECKS ,
i 5.1 Instrument screen height linearity and amplitude control linearity )
shall be verified prior to the performance of any system calibra- -
tions and at the beginning and end of the examination period or every three months, whichever is less. The same EBS signal ,
response (s) shall be used for the initial determination and subsequent field checks.
5.2 Tne ultrasonic instrument shall be verified as having a linear ,
vertical presentation within + 5% of the full screen heignt for at ;
' least 80% of the calibrated screen height in accordance with the d
following steps.
5.2.1 Utilizing the EBS and any given channel of the Sonic -
l I
System obtain two EBS pulses on the CRT.
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151-154 Rev. 2 l
5.2.2 Adjust the EBS controls and the receiver gain control to set the first indication to 80% full screen height (FSH) and the second indication at 40% FSH.
5 .,2 . 3 Without changing the EBS controls, adjust the receiver gain to sequentially set the larger indication from 100% ! ,
to 10% FSH in 10% increments. Record the smaller indication amplitude at each setting. Estimate the ;
readings to the nearest 1% FSH.
5.2.4 The reading must be 50% of the larger amplitude, within
+ 5% FSH.
~
l I i
5.2.5 Record all data and instrument settings on the appropriate l data sheet. ,
l 5.3 The accuracy of tne amplitude control of the ultrasonic system shall j i
- be verified as being within + 20% of the nominal amplitude ratio
~
i over its useful range in accordance with the following steps, l
5.3.1 Utilizing the EBS and any given channel of~the Sonic System obtain~an EBS pulse on the CRT. l, i
5.3.2 Adjust the receiver gain to set the indication to 80% l FSH. Record the receiver gain setting. ;
5.3.3 Decrease the receiver gain by 6dB and record the signal amplitude. .
5.3.4 Decrease the receiver gain again by 6dB and record the signal anplitude. Decrease the receiver gain by an I t
additional 6dB and record the signal amplitude. ;
I 5.3.5 Adjust the receiver gain to set the indication to 40% [
FSH. Record the receiver gain setting.
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mL October'5, 1982 , uct 5 N51C 1014 h E v. 2 3 -8 3 _
, NSID ,
0727W:42/121583 i 151-154 Rev. 2
' i 5.3.6 Increase the receiver gain by 6dB and record the signal l amplitude.
5.3.7 Adjust the receiver gain to set the indication to 20%
FSH. Record the receiver gain setting. .
I 5.3.8 Increase the receiver gain by 12dB and record the signal ,
amplitude.
i 5.3.9 Adjust the receiver gain to set the indication to 10%
FSH. Record the receiver gain setting.
i 5.3.10 Increase the receiver gain by 18dB and record the signal :
amplitude.
i 5.3.11 Recorded readings must be w M hin the following limits: i i
Indication Set at dB Control Indication Limits l
% of FSH Chance % FSH 80% -6dB 32 to 48% j !
80% -12dB 16 to 24% -
l 80% -18dB B to 12%
40% +6dB 64 to 96%
20% +12dB 64 to 96%
10% +18dB 64 to 96% i 5.3.12 Record all data and instrument settings on the appropriate data sheet.
5.4 Verification of performance of instrument performance checks shall be documented. Documentation shall include the date, time, and the initials of the operator.
5.5 A photog'raphic record of the RF pulse waveform shall be obtained for each transducer, before and after each vessel examination per paragraph 6.13.
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NSID. .
0727W:42/121583 l 151-154 Rev. 2 l
6.0 SYSTEM CALIBRATION i
! i i ,
6.1 Calibration Requirements - General !
I i l System calibration shall be performed at the Westinghouse Waltz Mill I
Site. -
i 6.1.1 Calibration shall include the complete ultrasonic system using responses from reflectors in the basic calibration block (s). The ultrasonic system is defined as the ultrasonic instrument, cables, transducer, couplant, and .
any other apparatus, instrument or circuit between the I instrument and the calibration block surface.
! l 6.1.2 Basic calibration blocks used for calibration of the .
ultrasonic system shall be defined by the plant specific l Examination Program Plan and shall meet the following !
requirements. : ;
6.1.2.1 The material from which the block (s) are fabricated shall be from one of the following:
(a) a nozzle dropout from the reactor vessel (b) a prolongation from the reactor vessel ;
(c) material of the same general material spec-ification, product form, and heat treat aent as one of the materials being joined.
6.1.2.2 Where the component material is clad, the '
block (s) shall be clad to the component clad i nominal thickness. Deposition of the cladding may be by an automatic or manual technique so long as the method represents, to the extent practical, the method used on the reactor vessel.
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h NSID 0727h:42/121583 151-154 Rev. 2 ;
6.l.2.3 The calibration block shall receive at least the minimum tempering temperature treatment required by the material specification and a post weld heat treatment of at least two hours.
6'7.3
. The block (s) shall be placed in the calibration tank and carefully leveled and aligned. The zero degree index of the manipulator shall be defined.
6.1.4 Each calibration shall be performed from the calibration block surface, clad or unclad, corresponding to the surfac'e of the component from which the examination will be performed. The calibration block, surface, reference reflectors, and scan directions used during calibration shall be defined on the calibration data sheets, If, for any reason, it is necessary to change any of the calibra-tion parameters from those recommended in the Examination ,
Program Plan, the changes shall be documented and reasons ,
for those changes shall be transmitted to the NSID l Inspection Services coordinator. .
6.1.5 During calibration the search unit centerline shall be at least 1-1/2 inches from the nearest side of the basic calibration block.
6.1.6 The water temperature for calibration shall be within 25"F !
i of the water temperature during scanning. Devices for this measurement are not considered MTE equipment.
i 6.1.7 Transducers shall be calibrated in fixtures which provide .
the angle of incidence specified in the examination . j Program Plan. Upon completion of the calibration sequence the transducer / fixture assembly shall be mounted on the array plate at the specified location. The orientation of i ,
i i'
E5 tlc V.f RF USE D October 5, 1982 8 can December 15, 1953 .
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.NSC 3014ECV 2 3-63
h NSID- 0727W:42/121583 151-154 Qev. 2 i the transducer with respect to the fixture shall not be changed. Bubbles shall not be present on the transducer face or the calibration block entry surface during the calibration sequence. ,
6.1.8 A calibration data sheet packet shall be completed for each transducer / inspection channel combination used to examine each volume required by the plant specific ! l Examination Program Plan. All data will be fully recorded '
such that the operating parameters can be verified in the field. Calibration and examination data sheets are attached as Figures 1 through 4.
6.1.9 Measurements of beam spread shall be made for each transducer used during the inspection prograr. These measurements shall be performed per paragraph 6.11. These data will be included in the calibration data described in l paragraph 6.1.8. !
6.1.10 The artificial waterpath selector shall be set at the ;
transit time equal to the waterpath of the transducer l (inspection channel 0) used to synchronize the interface I gating function for a given calibration package. l 6.2 Calibration for Straight Beam Examination of Vertical and l C'ircumferential Welds System calibration for each straight beam inspection channel / ;
. transducer combination used for examination of vertical and circum- l 1 ferential welds, including safe end welds and the flange-to-upper shell weld from the shell side, shall be performed as described f below.
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, 3 0727W:42/121583 l 151-154 Rev. 2 6.2.1 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly on the ;
manipulator in the calibration tank. !
1 6.2.2 Position the transducer to direct the sound beam toward ', ,
~ ~
the appropriate surface of the calibration block and '
adjust for the required waterpath.
6.2.3 Adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule on the CRT.
i' 6.2.3.1 Adjust the instrument range to the maximum achievabla sweep range where the initial pulse and entry surface reflection are displayed en the CRT screen. Record the transit time to the i; entry surface reflection.
6.2.3.2 Since the gate position controls of the ;
ultrasonic system are calibrated directly in , ;
units of time, the gate can be moved to coincide with the entry surface reflection and travel time in microseconds can be read directly from the digital display. All transit time <
measurements can be made in this manner. l l
6.2.3.3 Determine the sound velocity and measure the water temperature. Record these values.
I' y Round Trip Distance Travel Time '
i i -
h !
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NSID. .
0727W:42/121583 151-154 Rev. 2 !
6.2.4 Adjust the instrument delay such that the lower left corner of the entry surface reflection starts at the 0 gradicule on the CRT.
I 6.2.4.1 Adjust the instrument range such that metal !
travel between the entry surface reflection and !
block back surface reflection occupies 60% to 90% of the full sweep length. !
6.2.4.2 Record the transit time between the entry sur-face reflection and the back surface reflection.
6.2.4.3 Calculate the sound velocity in the calibration
~
I block and record this value. l 6.2.4.4 Adjust the selected gate controls to include all metal travel between the entry surface j reflection and the back surface reflection, j 6.2.5 Set the trace and gate baselines to zero percent of scale.
6.2.6 Position the transducer to obtain the maximum response from the side drilled hole which exhibits the highest am- :
plitude. Adjust the preamplifier gain control to set the l l indication amplitude to 40% + IdB of full screen height.
!! ark the peak of the indication on the screen. Record i instrument settings, indication amplitude, and the transit time from the entry surface reflection to the indication.
6.2.7 Without changing instrument settings move the transducer ,!
to obtain the maximum responses from the remaining calibration holes. Mark the peak of the indications on ;
i the screen. Record the indication amplitudes and transit I times from the water / steel interface to the indications".
ESFEC% E ArvSEO catt October 5, 1982 ract 11 catt December 15, 1983 ._
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0727W:42/121583 151-154 Rev. 2 6.2.8 Draw a line through the maximum response points on the CRT l screen. The curve may be extrapolated at either end for a distance of one-quarter the thickness of the calibration block. This line represents the basic calibration distance amplitude curve (DAC).
6.2.9 Adjust the EBS pulse train to follow the DAC over the entire gate length. Record the EBS control settings. ,
l !
6.2.10 The electronic DAC module function shall then be initiated. ;
l ,
i -
6.2.10.1 Adjust the electronic DAC controls so all EBS !
pulses are nominally 40% FSH.
6.2.10.2 Adjust the monitor gate threshold to the position where a 16% FSH alarm level is realized and set for positive trigger. ,
6.2.10.3 Disable the EBS, scan the block, and observe the ,
responses from each applicable calibration .!
reflector. The amplitude of each should be at :
l 40% FSH + IdB. If not, review steps 6.2.1 through 6.2.10.3. l 6.2.10.4 Decrease the receiver gain by 6dB. Switch the system to the cycle mode and scan the transducer i assembly over the calibration block at or l l
greater than the specified examination speed.
The gate alarm shall actuate when the peak !
response from each hole is detected. If the l alarm is not observed for one or more of the. ;
holes, investigate to identify the test system l parameter (s) (e.g., alarm count, repetition I rate, alarm level, etc.) which may require adjustment and make corrections, if necessary.
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C^iE December 15. 1983 iD"E October 5. 1982 ract 12 NS:Q 3 C 14 8. [ v 2 1 8 3
NSID, 0727W:42/121583 i 151-154 Rev. 2 l
' i 6.2.10.5. Increase the receiver gain by 6dB and record all pertinent calibration data on the calibration i data sheets. l l
6.2.11 Move DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical reflectors in the MTS which fall within the gated sweep length. Record the reflector identification, indication amplitude, and transit time to the indication from the initial pulse.
Reflectors selected for this step shall provide transit j i
times representative of those for the primary reflectors in the basic calibration block where practical.
6.3 Calibration for Angle Beam Examination of Vertical and Circumferential Vessel Welds I
System calibration for each angle beam inspection channel / transducer i combination used for examination of vertical and circumferential j vessel welds, including the flange-to-upper shell weld from the shell side, shall be performed as described below.
6.3.-l Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly on the manipulator in the calibration tank. ;
i 6.3.2 Position the transducer to direct the sound beam toward l I
the appropriate surface of the calibration block and adjust for the required waterpath.
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o^it October 5, 1982 rict 13 ,0*tt December 15, 1983 NOC 30:4 R Cv 2 3-8 3
h NSID. 07'27W:42/121583 151-154 Rev. 2 ,
i 6.3.3 Position the transducer to obtain a maximum response from the square notch on the opposite surface or the block corner and adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule on the CRT. ;
6.3.3.1 Adjust the instrument range to the maximum achievable sweep range where the initial pulse i and entry surface reflection are displayed on the CRT screen. Record the transit time to the entry surface reflection. ,
6.3.3.2 Since the gate position controls of the ultrasonic system are calibrated directly in units of time, the gatt can be moved to coincide with the entry surface reflection and travel time in microseconds can be read directly from !
the digital display. All transit time !
I measurements can be made in this manner. i I
6.3.3.3 Determine the sound velocity and measure the water temperature. Record these values, y , Round Trip Distance j Travel Time i n1 6.3.4 Adjust the instr ment delay such that the lower left corner of the ertry surface reflection starts at the 0 gradicule on the CRT. i 6.3.4.1 Adjust the instrument range such that metal-travel between the entry surface reflection and I the notch response or the block corner response occupies 50% to 80% of the full sweep length, i i
EUEciivt af VISED o*Tc October 5, 1982 14 cast Decembe'r 15, 1983 i rier N5a61014 6.E v. 214 3
NSID , ,
0727W:42/121583 ,151-154 Rev. 2 i 6.3.4.2 '
Record the transit time between the entry I
surface reflection and the notch response or '
block corner response.
6.3.4.3 Calculate the sound velocity in the calibration block and record this value. I 6.3.4.4 Position the transducer to obtain the maximum response from the 3/4T hole after the beam has j bounced from the opposite surface (6/8 node l response) and adjust the selected gate controls ,
to include all metal travel between the entry j surface reflection and this indication.
6.3.5 Set the trace and gate baselines to zero percent of scale. i l
6.3.6 Position the transducer to obtain the maximum response l l from the side drilled hole which exhibits the highest am- j plitude. Adjust the preamplifier gain control to set the !
indication amplitude to 80% + ldB of full screen height.
Mark the peak of the indication on the screen. Record I instrument settings, indication amplitude, and the transit time from the entry surface reflection to the indication.
6.3.7 Without changing instrument settings move the transducer to obtain the maximum responses from the other calibration holes including the 5/8 node response from the 3/4T hole.
Mark the peaks of the indications on the screen. Record indication amplitudes and transit times from the ,
water / steel interface to the indications. If the 5/8 node l response from the 3/4T hole is not readily discernable, !
the DAC curve amplitude point shall be determined by .
calculating the dB difference between the 1/2T and 3/4T l l
l E ME CTWE A F v'SE C caTE October 5, 1982 ucE 15 DATE December 15, 1983 I N5tC 3014 R E V 2+5 3
NSID -
h,0727W:42/121583 151-154 Rev. 2 l reflector amplitudes, decreasing the 3/4 T reflector amplitude by two times that difference, and marking the resulting amplitude at the point on the sweep that represents the transit time to the 5/8 node position.
~
6.'3.8 Draw a line through the maximum response points on the CRT screen. The curve may be extrapolated at either end for a i distance of one-quarter the thickness of the calibration l block. This line represents the basic calibration distance amplitude curve (DAC).
6.3.9 Without changing the instrument settings position the transducer to obtain a maximum response from the square l
notch on the opposite surface, if applicable. Record the , ,
indication amplitude and transit time from the water / steel ,
interface to the indication. ,
i 6.3.10 Adjust the EBS pulse train to follow the DAC over the entire gate length. Record the EBS control settings. ;
6.3.11 The electronic DAC module function shall then be initiated.
6.3.11.1 Adjust the electronic DAC controls so all EBS i pulses at transit times from the entry surface !
i reflection to and including the response from l l the 1/4T hole are nominally 80% FSH and those at !
transit times in excess of the 1/4T hole to the ,
end of the gate are nominally 40% FSH.
6.3.11.2 Adjust the monitor gate threshold to the position where a 16% FSH alarm level is reaMzed and set for positive trigger.
l RF VISED E6ft:T .'t December 15, 1983 ,
catt October 5, 1982 not 16 cett
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NSID 0727W:42/121583 ISI-154 Rev. 2 I
6.3.11.3 . Disable the EBS, scan the block, and observe the .
I responses from each applicable calibration !
reflector. The amplitude of the 1/4T hole I should be at 80% FSH 1I dB and the amplitudes of.
the 1/2T, 3/4T, and 5/8 node response from the
~ '
3/4T hole should be at 40% FSH 1 ldB. If not, review steps 6.3.1 through 6.3.11.3.
6.3.11.4 Decrease the receiver gain by 6dB. Switch the !
system to the cycle mode and scan the transducer assembly over the calibraticn block at or I
greater than the specified examination speed.
The gate alarm shall actuate when the peak amplitude from each hole is detected. Decrease the receiver gain by an additional 8dB and once again scan over the block at or higher than the I l
specified examination speed. The alarm should ;
actuate when the peak amplitude from the 1/4T hole is detected. If the alarm is not observed I for one or more of the holes, investigate to ,
identify the test system parameter (s) (e.g.,
alarm count, repetition rate, alarm level, etc.) !
which may require adjustment and make {
corrections, if necessary. I l
~
6.3.11.5 Increase the receiver gain by 14dB and record all pertinent calibration data on the ,
i calibration data sheets. .
. I I
i RF viS E D E ['l C ' % E l cet October 5, 1982 ina 17 mt December 15, 1983 !
N$t: 30.4 #Ev 2 3 8a
h NSID 0727ti:42/121583 151-154 Rev. 2 ,
j 6.3.12 Nove DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical ,
reflectors in the KTS which fall within the gated sweep length. Record the reflector identification, indication amplitude, and transit time to the indication from the initial pulse.
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.4 Calibratior, for Examination of the Flange-to-Upper Shell Weld From the Flange Seal Surface ;
I System calibration for each inspection channel / transducer j combination used for examination of the flange-to-upper shell weld f I
from the flange seal surface shall be performed as described below.
i 6.4.1 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly on the manipulator in the calibration tank.
6.4.2 Position the transducer to direct the sound beam toward the appropriate surface of the calibration block and adjust for the required waterpath.
l '
6.4.3 Adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule on !
the CRT. .
I i
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!:att October 5, 1982 nar 18 DAit December 15, 1983 i ma w w 2+a '. _ ._
, NSID ,
- 0727W:42/121583 l 'ISI-154 Rev. 2 l
6.4.3.1 , Adjust the instrument range to the maximum I achievable sweep range where the initial pulse and entry surface reflection are displayed on the CRT screen. Record the transit time to the
. entry surface reflection.
6.4.3.2 Since the gate position controls of the ,
ultrasonic system are calibrated directly in j units of time, the gate can be moved to coincide I with the entry surface reflection and travel time in microseconds can be read directly from the digital display. All transit time <
measurements can be made in this manner. l l
l 6.4.3.3 Determine the sound velocity and measure the water temperature. Record these values.
y , Round Trip Distance Travel Time !
l 6.4.4 Adjust the instrument delay such that the lower lef t corner of the entry surface reflection starts at the 0 !
gradicule on the CRT. .
i ,.
6.4.4.1 Adjust the instrument range such that metal j
- travel between the entry surface reflection and !
the reflection from the reference hole at the longest test meta 1 distance occupies 60% to 90%
of the full sweep length. j
. l I
6.4.4.2 Record the transit time between the entry surface reflection and the reflection from the l reference hole. .4 i ,
, i i RF r$C O E 6f E C1WE c"E October 5, 1982 ne,i 19 cm December 15, 1983 W O 3 C 14 E C V. 2 3 8 3 '
~
h NSID-0727W:42/121583 ! 151-154 Rev. 2 i
6.4.4.3 Calculate the sound velocity in the calibration j block and record this value.
I 6.4.4.4 Adjust the selected gate controls to include all
.. . metal travel including the weld and specified ,
adjacent base material on the shell and flange
{
sides of the weld. l l
l 6.4.5 Set the trace and gate baselines to zero percent of scale. .
6.4.6 Position the transducer to obtain the maximum response from the side drilled hole which exhibits the highest am-plitude. Adjust the preamplifier gain control to set the indication amplitude to 80% + ldB of full screen height. :
Mark.the peak of the indication on the screen. Record ;
instrument settings, indication amplitude, and the transit j time from the entry surface reflection to the indication, j i
6.4.7 Without changing instrument settings move the transducer j to obtain the maximum responses from the remaining j calibration holes. Mark the peak of the indications on i the screen. Record the indication amplitudes and transit times from the water / steel interface to the indications. .
~
i 6.4.8 Draw a line through the maximum response points on the CRT l screen. The curve may be extrapolated at either end for a distance of one-quarter the thickness of the calibration block. This line represents the basic calibration distance amplitude curve (DAC).
6.4.9 Adjust the EBS pulse train to follow the DAC over the* ;
entire gate length. Record the EBS control settings. -
4 tertems , ar est:
wt October 5, 1982 l uct 20 ,WE December 15, 1983 o m cbsu es mn
h NSID'0727W:42/121583 151-154 Rev. 2 i
6.4.10 The elect'ronic DAC module function shall then be initiated.
t 6.4.10.1 Adjust the electronic DAC controls so all EBS !
pulses are nominally 80% FSH. l
.. . l 6.4.10.2 Adjust the monitor gate threshold to the position where a 16% FSH alarm level is realized i and set for positive trigger. ,
6.4.10.3 Disable the EBS, scan the block, and observe the responses from each applicable calibration ,
reflector. The amplitude of each should be at l 80% FSH + IdB. If not, review steps 6.4.1 I through 6.4.10.3.
- 6.4.10.4 Decrease the receiver gain by 14dB. Switch the system to the cycle mode and scan the transducer assembly over the calibration block at or greater than the specified examination speed.
The gate alarm shall actuate when the peak response from each hole is detected. If the alarm is not observed for one or more of the holes, investigate to identify the test system :
parameter (s) (e.g., alarm count, repetition rate, alarm level, etc.) which may require -
adjustment and make corrections, if necessary.
6.4.10.5 Increase the receiver gain by 14dB and record
- all pertinent calibration data on the calibration data sheets.
i E6FICTwt im r$t:
catt October 5, 1982 . ,r 21 IcAtt December 15, 1983
NSID . -
- h,0727W:42/121583 ,
151-154 Rev. 2 S.4.11 Move DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical reflectors in the MTS which fall within the gated sweep length. Record the reflector identification, indication
~
amplitude, and transit time to the indication from the initial pulse.
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.5 Calibration for Examination of Nozzle-to-Shell Welds from the Nozzle Bore :
1 i
System calibration for each inspection channel / transducer !
combination used for examination of nozzle-to-shell welds from the .
nozzle bore shall be performed as described below.
i 6.5.1 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly to the manipulator in the calibration, tank.
6.5.2 Position the transducer to direct the sound beam toward the appropriate surface of the calibration block and adjust for the required waterpath.
6.5.3 Adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule on the CRT. .
tert:t ,t atwste
- it October 5, 1982 ,4ct 22 oiTE December 15, 1983 NOO 3C;4 htv P 14 3
~ h NSID- 0727W:42/121583 151-154 Rev. 2 t 6.5.3.1 . Adjust the instrument range to the maximum achievable sweep range where the initial pulse and entry surface reflection are displayed on {'
the CRT screen. Record the transit time to the entry surface reflection. ;
I i
6.5.3.2 Since the gate position controls of the i ultrasonic system are calibrated directly in !
I units of time, the gate can be moved to coincide ,
with the entry surface reflection and travel time in microseconds can be read directly from the digital display. All transit time measurements can be made in this manner.
6.5.3.3 Determine tne sound velocity and measure the ;
water temperature. Record these values.
y , Round Trip Distance Travel Time 6.5.4 Adjust the instrument delay such that the lower left j corner of the entry surface reflection starts at the 0 '
- gradicule on the CRT. !
6.5.4.1 Adjust the instrument range such that metal
- I travel between the entry surface reflection and the reflection from the reference Pole at the longest test metal distance occupies 60% to 90t l of the full sweep length. l 1
6.5.4.2 Record the transit time between the entry surface reflection and the reflection from the j l
reference hole.
I arvsn tirr:ut '
October 5, 1982 23 c ^it December 15, 1983 ct ria N5st, IC;4 A C V 2183
h NSID, .
0727W:42/121583 151-154 Rev. 2 1 6.5.4.3 Calculate the sound velocity in the calibration block and record this value.
6.5.4.4 Adjust the selected gate controls to include all metal travel which will include the entire
~ '
nozzle, the weld, and specified adjacent base material on the shell side of the weld. Consult the Examination Program Plan to verify that this l gate length will monitor the required ! I examination volume. l 6.5.5 Set the trace and gate baselines to zero percent of scale.
I.
6.5.6 Position the transducer to obtain the maximum response I from the side drilled hole which exhibits the highest I
amplitude. Adjust the preamplifier gain control to set the indication amplitude to 80% (+ IdB) of full screen i
~ '
height. Mark the peak of the indication on the screen.
Record instrument settings, indication amplitude, and the ,
transit time from the entry surface reflection to the .
indication. f, 6.5.7 Without changing instrument settings move the transducer ;
to obtain the maximum responses from the remaining f calibration holes. Mark the peak of the indications on ! >
the screen. Record the indication amplitudes and transit times from the water / steel interface to the indications.
6.5.8 Draw a line through the maximum response points on the CRT ,
screen. The curve may be extrapolated at either end for a ,
distance of one-quarter the thickness of the calibration block. This line represents the basic calibration ;
distance amplitude curve (DAC).
l i i nF vtSE D E 6 'EC*1 1 '
74 D ^T E norpehpr M. IQR1 DI netnhar ;; 1QR7 ract
~
NS Q :C14 84 L v. 7-18 3 .
-. ~ _ _ . - . . . - - - _ . _ _ . --
NSID. ,
0727W:42/121583 l 151-154 Rev. 2 i
6.5.9 Adjust the EBS pulse train to follow the DAC over the l entire gate length. Record the EBS control settings.
6.5.10 Tne electronic DAC module function shall then be initiated. ;
6.5.10.1 Adjust the electronic DAC controls so all EBS f pulses are nominally 80% FSH. ! :
6.5.10.2 Adjust the monitor gate threshold to the I position where a"16% FSH alarm level is realized and set for positive trigger, l
6.5.10.3 Disable the EBS, scan the block, and observe the j responses from each applicable calibration reflector. The amplitude of each should be at .
80% FSH + ldB. If not, review steps 6.5.1 l
through 6.5.10.3. :
6.5.10.4 Decrease the receiver gain by 14dB. Switch the i system to the cycle mode and scan the transducer assembly over the calibration block at or i greater than the specified examination speed. l The gate alarm shall actuate when the peak ;
response from each hole is detected. If the ,
alarm is not observed for one or more of the
~
holes, investigate to identify the test system parameter (s) (e.g., alarm count, repetition rate, alarm level, etc.) which may require adjustment and make corrections, if necessary.
6.5.10.5 Increase the receiver gain by 14dB and record ,
all pertinent calibration data on the calibration data sheets. I t ut ctr.t arvste
,o^tt October 5, 1982 etat 25 c'TE December 15, 1983 N% 3014 F.E v 214 3 ,
,h NSID' 0727W:42/121583 151-154 Rev. 2
?
6.5.11 Movo DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS -
response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical l reflectors in the MTS which fall within the gated sweep l length. Record the reflector identification, indication amplitude, and transit time to the indication from the I initial pulse.
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.6 Calibration for Examination of Nozzle Radii and Protrusions i
System calibration for each angle beam inspection enannel/ transducer l combination used for nozzle radius and protrusion examination shall . ;
be performed as described below. {
Attach the transducer to the appropriate fixture for the 6.6.1 i I
required incident angle and mount the assembly on the manipulator in the calibration tank.
6.6.2 Position the transducer to direct the sound beam toward the appropriate surface of the calibration block and adjust for the required waterpath. ;
6.6.3 Position the transducer to obtain a maximum response fron '
the side drilled hole at the longest test metal distance I and adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule 'on the CRT. 1 1
i i
c > < t e mt ar vistc ,
ont October 5, 1982 ,et 26 cet December 15, 1983 1
%.e :ca uv.a ne .. -
$$( .NSID'. '
0727W:42/121583 i ISI-154 Rev. 2 6.6.3.1 . Adjust the instrument range to the maximum achievable sweep range where the initial pulse j
and entry surf ace ref'1cetion are displayed on !
the CRT screen. Record the transit time to the l I
entry surface reflection. !
i 6.6.3.2 Since the gate position' controls of the !
ultrasonic system are cal'brated directly in units of time, the gate can be moved to coincide ;
with the entry surface reflection and travel time in microseconds can be read directly from j the digital display. All transit time l measurements can be made in this manner. .
6.6.3.3 Determine the sound velocity and measure the water temperature. Record these values, j y , Round Trip Distance Travel Time.
I 6.6.4 Adjust the instrument delay ~ such that the lower lef t
- s. corner of the entry surface reflection starts at the 0 ;
~
gradicule on.the CRT. j 6.6~.4.1 Adjust the instrument range such that metal !
travel between the entry surface reflection and the response from the reference h'le o at the longest test-tetfl distance occupies 60% to 90%
of the full sweep length.
\ 6.6.4.2 . Record the transit time between the entry surface reflection and the side drilled hole I
response.
c E8 tE ** .E M USEO DDE October 5, 1982 not 27 , oct December 15, 1983 msic ica arv 2.i.33 c- ,
h,0727W:42/121583 NSID ,
151-154 Rev. 2 ,
6.6.4.3 Calculate the sound velocity in the calibration block and record this value.
6.6.4.4 Adjust the selected gate controls to include all metal travel between the entry surface reflec- ,
tion and the response from the specified side drilled hole at the longest test metal distance.
6.6.5 Set the trace and gate baselines to zero percent of scale. I 6.6.6 Position the transducer to obtain the maximum response from the drilled hole which exhibits the highest ampli-tude. Adjust the preamplifier gain control to set the indication amplitude to 80% + IdB of full screen height.
Mark the peak of the indication on the screen. Record instrument settings, indication amplitude, and the transit time from the entry surface reflection to the indication.
i 6.6.7 Without changing instrument settings move the transducer to obtain the maximum responses from the other calibration .
hole. Mark the peak of this indication on the screen.
Record the indication amplitude and transit time from the water / steel interface to the indication. l i
6.6.8 Draw a line through the maximum response points on the CRT screen. The curve may be extended at either end for a I distance equivalent to one-quarter the depth of the ;
deepest hole. This line represents the basic calibration l distance amplitude curve (DAC). l l
I 6.6.9 Adjust the EBS pulse train to follow the DAC over the. l entire gate length. Record the EBS control settings. ,
i i
E 8 'E C '> cf RF USE D i ca t October 5, 1982 r c, 28 om December 15, 1983 i
NS :', 3 C 3 4 r.C v. 2 3 8 3
) !
W . NSID . S ,
F 151-154 Rev. 2
~
'0727W:42/1215B3r' v i 6.6.10 Thevelectronic DAC modulgifunction'shall then be initiated.
< 1 ,,
_l? :
y 6.6.10,.1 Adjust the electronic DAC' controls so all EBS ,
I
' pulses are nominally 50% FSH. '
' ~
' . / 5.G[.10.2. Adjust the monitor gate threshold ts the !
l' A
- # position where a 167/alarn level is realized FSH and set for positive trigg'er. ,
> , , 1
',f .
'6P 6.6.10.3 Disadle the EBS, scan the block, and observe the I
s responses from each applicabli calibration
. reflecto_r. Tne. amplitude of each_should be 80% ,
, TSH+ldB. Ifr.ot,revfersteps6.6.1through j
" i'-
6.6.10.3. ,
7 ,
6.5.10.4 Decrease the receiver gain by 14dB. Switch the ! >
system tio'the tycle mode and scan the transducer !
I assembly over the calibration block at or greater than the specified , examination speed.
The gate alarm shall actuate when the peak
. response from each hole is detected. If the !
- slarm is not observed for one or more of the !
holes, investigate to identify the test system 1 ,
[ parameter (s) (e.g., alarp count, repetition i
( rate, alarm level, etc.), which may require l adj0stmentland make correptions, if' necessary. -
> /
6.6.10.5 Increase the receiver gain by 14dB and record '
,. all pertinent calibration data on tn,e !,
calibration data sheets., !
' r
,. t t
E U ECiivE ( RF U$E D
-Decenber 15, 1983 onE October 5, 1982 na 2g ; v.tr
+
N5ID 103 d A E v. 214 3 j, j .
^
'NSID , . l 0727W:42/121583 l 15I-154 Rev. 2 {
6.6.11 Move DEC Delay 1 to a position past the end of.the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical ;
reflecton in the MTS which fall within the gated sweep i
~ ~ '
length. Record the reflector identification, indication i amplitude, and transit time to the indication from the initial pulse. !
l 6
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.7 Calibration for Angle Beam Examination of Nozzle-to-Safe End Welds System calibration for each angle beam inspection channel / transducer I combination used for safe end inspection shall-be performed as described below. When the calibration block is a mockup of the bimetallic weld, calibration shall be from the side of the weld, f carbon steel or stainless steel, corresponding to the side of the
- weld from which the examination will be performed. !
6.7.1 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly to the manipulator in the calibration tank. .
6.7.2 Position the transducer to direct the sound beam toward f the appropriate surface of the calibration block and ;-
adjust for the required waterpa.th. I 6.7.3 Position the transducer to obtain a maximum response from !,
l l-the side drilled hole at the longest test metal distance ] :
and adjust the instrument delay such that the lower left !
corner of the initial pulse starts at the 0 gradicule on 1
the CRT.
l ,
surest M larrste December 15, 1983 iont October 5, 1982 pact ionc 'l ns,6 w m u n
hNSID- 0727W:42/121583 151-154 Rev. 2 i l
6.7.3.1 Adjust the instrument range to the maximum achievable sweep range where the initial pulse and entry surface reflection are displayed on the CRT screen. Record the transit time to the entry surface reflection.
6.7.3.2 Since the gate position controls of the ultrasonic system are calibrated directly in units of time, the gate can be moved to coincide with the entry surface reflection and travel [
time in microseconds can be read directly from the digital display. All transit time -
measurements can be made in this manner.
6.7.3.3 Determine the sound velocity and measure the :
i water temperature. Record these values. I\
- I- '
y , Round Trip Distance Travel Time ,
6.7.4 Adjust the instrument delay such that the lower left corner of the entry surface reflection starts at the 0 l gradicule on the CRT. ]
6.7.4.1 Adjust the instrument range such that metal l' travel between the entry surface reflection and the response from the side drilled hole at the longest test distance occupies 50% to 70% of the full sweep-length. ,
t 6.7.4.2 Record the transit time between the entry i
surface reflection and the response from the i drilled hole at the longest test distance.
E F FE Ct vt . Ar v:EE0 o'TE October 5, 1982 ,,ct 31 o'TE December 15, 1983 N5 C 1014 R EV, 2 3 8 3 -
7 _ _
NSID 0727W:42/121583 151-154 Rev. 2 6.7.4.3 Calculate the sound velocity in the calibration ! i i
block and record this value. !
6.7.4.4 Adjust the selected gate controls to include all metal travel from the entry surface reflection
~ '
to the equivalent of 1/4T past the 3/4T hole as a minimum.
6.7.5 Set the trace and gate baselines to zero percent of scale. I 6.7.6 Position the transducer to obtain the maximum response from the side drilled hole which exhibits the highest am-plitude. Adjust the preamplifier gain control to set the indication amplitude to 40% + ldB of full screen height.
Mark. the peak of the indication on the screen. Record i instrument settings, indication amplitude, and the transit time from the entry surface reflection to the indication.
6.7.7 Without changing instrument settings move the transducer to obtain tne maximum responses from the other calibration holes. Mark the peaks of these indications on the screen. Record the indication amplitudes and transit time from the water / steel interface to the indications.
6.7.8 Draw a line through the maximum response points on the CRT screen. The curve may be extrapolated at either end for a ,
distance of one-quarter the thickness of the calibration i block. This line represents the basic calibration j distance amplitude curve (DAC).
6.7.9 Adjust the EBS pulse train to follow the DAC over the' entire gate length. Record the EBS control settings. )'
I I' ,
p t tor: .s l Preste December 15, 1983 ct. October 5, 1982 m et 32 i:nt I w: u:4 u a :.o
{
NSID. -
0727W:42/121583 l 151-154 Rev. 2 i
.6.7.10 The electronic DAC module function shall then be initiated.
6.7.10.1 Adjust the electronic DAC controls so all EBS pulses are nominally 40% FSH.
6.7.10.2 Adjust the monitor gate threshold to the ,
position where a 16% FSH alarm level is realized and set for positive trigger.
6.7.10.3 Disable the EBS, scan the block, and observe the responses from each applicable calibration reflector. The amplitude of each should be 40%
FSH + IdB. If not, review steps 6.7.1 through ,
6.7.10.3. !
6.7.10.4 Decrease the receiver gain by 6dB. Switen the j system to the cycle mode and scan the transducer l assembly over the calibration block at or !
greater than the specified examination speed.
The gate alarm shall actuate when the peak response from each hole is detected. If the l l'
alarm is not observed for one or more of the holes, investigate to identify the test system l
parameter (s) (e.g., alarm count, repetition rate, alarm level, etc.) which may require l l adjustment and make corrections, if necessary.
6.7.10.5 Increase the receiver gain by 6dB and record all. l pertinent calibration data on the calibration data sheets. !
- catt October 5, 1982 ract 33 DATE December 15, 1983 ,
ed.C 1014 h t v. 2 3-8 3
- h NSID. 0727W:42/121583 151-154 Rev. 2 i 6.7.11 Move DEC Delay 1 to a position past the end of the gated -
sweep, i.e. Where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical reflectors in the MTS which fall within the gated sweep ;
~ ~ '
length. Record the reflector identification, indication ,
amplitude, and transit time to the indication from the initial pulse.
Reflectors selected for this step shall provide transit I times representative of those for the primary reflectors in the basic calibration block where practical. ,
p 6.8 Calibration for Examination of Reactor Vessel Fla~nge Ligaments System calibration for each straight beam inspection channel /
transducer combin4tien used for flange ligament inspection shall be ,
performed as described below.
Attach the transducer to the appropriate fixture for the 6.8.1 l required incident angle and mount the assembly to the manipulator in the calibration tank.
6.8.2 Position the transducer to direct the sound beam toward the appropriate surface of the calibration block and adjust for the required waterpath.
6.8.3 Adjust the instrument delay such that the lower left corner of the initial pulse starts at the 0 gradicule on the CRT.
(5tt:* .E
- t October 5, 1982 cact 34 can December 15, 1983 l W 5 .
- :4619.2183
h NSlQ 0727W:42/121583 151-154 Rev. 2 ,
l i
6.8.3.1 . Adjust the instrument range control to the maximum achievable sweep range where the initial
-pulse and entry surface reflection are displayed on the CRT screen. Record the-transit time to the entry surface reflection.
6.8.3.2 Since the gate position controls of the f ultrasonic system are calibrated directly in ,
units of time, the gate can be moved to coincide ,
with the entry surface reflection and travel time in microseconds can be read directly from the digital display. All transit time measurements can be made in this manner.
6.8.3.3 Determine the sound velocity and measure the water temperature. Record these values.
) ,
y , Round Trip Distance Travel Time 6.8.4 Adjust the instrument delay such that the lower left I i
corner of the entry surface reflection starts at the 0 l gradicule on the CRT. :
I 6.8.4.1 Adjust the instrument range such that metal l travel between the entry surface reflection and the reflection from the applicable reference hole at the longest test metal distance occupies 60% to 90% of the full sweep length, i l
6.8.4.2 Record the transit time between the entry surface reflection and the reflection from the ,
reference hole. l RF vtsE O E a rE CTsvt c'TE October 5, 1982 not 35 otit December 15, 1983 ,
NSiC 101d A C V. 210 3 l
NSID
?
0727W:42/121583 151-154 Rev. 2 1
6.8.4.3 Calculate the sound velocity in the calibration j block and record this value, j i
6.8.4.4 Adjust the selected gate controls to include all
. .. - metal travel between the water / steel interface and the far limit of the inspection volume as defined in the Examination Program Plan. This distance shall be the equivalent of one stud l hole diameter, as a minimum.
6.8.5 Set the trace and gate baselines to zero percent of scale.
I 6.8.6 Position the transducer to obtain the maximum response ;
I from the side drilled hole which exhibits the highest amplitude. Adjust the preamplifier gain control to set f the indication amplitude to 40% (+ IdB) of full screen !
height.
- Mark the peak of the indication on the screen. j Record instrument settings, indication amplitude, and l transit time from the entry surface reflection to the ,';
indication, j 6.8.7 Without changing instrument settings move the transducer to obtain the maximum responses from the remaining i calibration holes. Mark the pe. , of the indications on !
i the screen. Record the indication amplitudes and transit l times from the water / steel interface to the indications.
6.8.8 Draw a line through the maximum response points on the CRT screen. The curve may be extrapolated at either end for a I l
distance of one-quarter the thickness of the calibrati,on ;
block. This line represents the basic calibration j distance amplitude curve (DAC).
t
- AFvSEO I O[ *E E Ci r.Octo6er t DE December 15. 1983
- 5. 1982 rict 36 we, ic a u t v +sa
- h NSID. 0727W:42/121583 151-154 Rev. 2 '
6.8.9 Adjust the EBS pulse train to follow the DAC over the ;
entire gate length. Record the EBS control settings.
t 6.8.10 The electronic DAC module function shall then be initiated. I i
6.8.10.1 Adjust the electronic DAC controls so all EBS ,
pulses are nominally 40% FSH.
6.8.10.2 Adjust the monitor gate threshold to the !
position where a 16% FSH alarm level is realized ,
and set for positive trigger.
6.8.10.3 Disable the EBS, scan the block, and observe the responses from each applicable calibration reflector. The amplitude of each should be at ;
40% FSH + ldB. If not, review steps 6.8.1 l through 6.8.10.3. ;
6.8.10.4 Decrease the receiver gain by 6dB. Switch the t system to the cycle mode and scan the transducer assembly over the calibration block at or greater than the specified examination speed. f The gate alarm shall actuate when the peak {
response from each hole is detected. If the ;
alarm is not observed for one or more of the (
holes, investigate to identify the test system parameter (s) (e.g., alarm count, repetition rate, alarm level, etc.) which may require adjustment and make corrections, if necessary, i 6.8.10.5 Increase the receiver gain by 6dB and record all pert.inent calibration data on the calibration ;
data sheets. .
on e c,1 at wst e October 5, 1982 37 oatt December 15, 1983 o'it nor _
%C,1014 R E v. 2 3 8 3'
NSID-0727W:42/121583 151-154 Rev. 2 i 6.8.11 Move DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain the peak responses from at least three cylindrical reflectors in the MTS which fall within the gated sweep
~
length. Record the reflector identification, indication amplitude, and transit time to the indication from the initial pulse.
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.9 Calibration for Full Node Angle Beam Examination of Vertical and Circumferential Vessel Welds System calibratiorj for each inspection channel / transducer combination used for full node angle beam examination of the volume of material near the vessel inside diameter shall be performed as described below.
6.9.1 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly on the manipulator in the calibration tank.
6.9.2 Position the transducer to direct the sound toward the appropriate surface of the calibration block at the l required waterpath. Record the transit time from the initial pulse to the entry surface reflection. ,
6.9.3 Position the transducer to obtain a maximum full node -
response from the square notch on the entry surface of the 1
block. '
l l
i 15 Ff 0Twi RF VSEC c'tt October 5, 1982 riot 38 CatE December 15, 1983 I MiC1C14EEv 2383 5
NSID , , ,
. 0727W:42/121583 l 151-154 Rev. 2 l
6.9.4 Adjust the instrument delay such that the lower left l -
corner of the entry surface reflection starts at the 0 gradicule on the CRT.
6.9.4.1 Adjust the instrument range such that metrl
~ ~
travel between the entry surface reflection and the notch response occupies 50% to 80% of the full sweep length.
6.9.4.2 Record the transit time between the entry surface reflection and the notch response. ,
6.9.4.3 Adjust the selected gate controls to include all +
metal travel between the 7/8 node and 1 1/8 node ;
responses fron the 1/4T hole. - t 6.9.5 Set the trace and gate baselines to zero percent of scale. i r
6.9.6 Adjust the preamplifier gain control to set the notch full node response indication to 40% + ldB of full screen ,j :
height. Mark the peak of the indication on the screen, f Record instrument settings, indication amplitude, and !
transit time from the entry surface reflection to the indication.
6.9.7 Draw a horizontal line through the maximum response point l on the CRT and extend it to include the entire gate length. This line represents the basic calibration ,
l distance amplitude curve (DAC). .
- i f
t arwste !
m rt: tis t o'Tc December 15, 1983 !
October 5, 1982 39 i c "E etar l
ev$+0 ]C ;4 8.t v 218 3
NSID , ,
0727W:42/121583 l 151-154 Rev. 2 6.9.8 Adjust the EBS pulse train to follow the DAC over the !
entire gate length. Record the EBS control settings, i
6.9.9 Adjust the monitor gate threshold to the position where a 16% FSH alarm level is realized and set for positive trigger.
Disable the EBS, scan the block, and observe the 6.9.9.1 response from the notch. Tne amplitude should :
be at 40% FSH + IdB. If not, review steps 6.9.1 through 6.9.9.1.
6.9.9.2 Decrease the receiver gain by 6dB. Switch the l system to the cycle mode and scan the transducer !
over the calibration block at or greater than the examination speed. The gate alarm should actuate when the peak response from the notch is detected. If the alarm is not observed for one !
or more of the holes, investigate to identify the test system parameter (s) (e.g., alarm count, ,
I repetition rate, alarm level, etc.) which may l require adjustment and make corrections, if !
i necessary. .
6.9.9.3 Increase the receiver gain by 6dB and record all pertinent calibration data on the calibration data sheets. i I 6.9.10 Move DEC Delay 1 to a position past the end of the gated l sweep, i.e. where the DEC will not influence the responses ;
from the MTS reflectors. Position the transducer to j obtain the peak responses from at least three cylindrical l reflectors in the MTS which f all within the gated sweep length. Record the reflector identification, indication ,
amplitude, and transit time to the indication from the initial pulse.
October 5, 1982 40 f/115'" December 15, 1983
[5't ,,y ns,c seu s.w r 1 es ~.
h NSID 151-154 Rev. 2
- 0727W:42/121503 ;
Reflectors selected for this step shall provide transit times representative of those for the primary reflectors in the basic calibration block where practical.
6.10 Cilibration for Near Surface Examinations System calibration for each inspection channel / transducer combina-tion used for near surface examination of volumes of material near the vessel inside diameter shall be performed as described below.
6.10.1 Transducers used for these examinations shall be dual-element, transmit-receive, 2.25 tEz units of the type Ultran WKSI-2.25 WRV, WPSI-2.25 WRV, or equivalent. The I
nominal waterpath shall be 6.0 inches and the nominal incident angle shall be 12.5* unless otherwise specified.
6.10.2 Attach the transducer to the appropriate fixture for the required incident angle and mount the assembly on the ;
manipulator in the calibration tank. .
6.10.3 Position the transducer to direct the sound beam toward the appropriate surface of the calibration block at the requirsd waterpath. Record the tr'ansit time from the l initial pulse to the entry surface reflection. l f
i NOTE f'
It may be necessary to increase the gain and/or use one search unit element in the pulse-echo mode to obtain a
~
discernable entry surface reflection.
6.10.4 Position the transducer to obtain a maximum' response from I the 1/8-inch diameter side drilled hole located 3/4-inch in depth from the entry surface.
l I
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I E8 tt '..!
RF v:SE D oct December 15, 1983 ic"t October 5, 1982 ner 41 waa:46n i m
h NSID' ;
15I-154 Rev. 2 !
0727W:42/121583 I
, l 6.10.5 Adjust the instrument delay such that the lower left corner of the entry surface reflection starts at the 0 gradicule on the CRT.
. - 6.10.5.1 Adjust the instrument range such that metal travel between the entry surface reflection and the response from the 1/8" diameter side drilled hole at 3/4-inch depth occupies 50% to 75% of i the full sweep range. '
6.10.5.2 Record the transit time between the entry surface reflection and the hole response.
6.10.5.3 Adjust the selected gate controls to include as a minimum all metal travel from the lower lef t -i corner of the entry surface reflection to at j least 10 microseconds past the response from the l 1/8-inch diameter hole at 3/4-inen depth.
6.10.6 Set the trace and gate baselines to zero percent of scale. ;
6.10.7 Adjust the preamplifier gain control to set tne indication from the 1/8-inch diameter hole at 3/4-inch depth to 80% +
IdB of full screen height. Mark the peak of the indication on the screen.
6.10.8 Without changing instrument settings move the transducer l to obtain maximum responses from the two remaining ;
- calibration holes and the square notch on the entry surface of the block, f l
1 l
l l
tutet .r anist:
nce 42 out December 15. 1983 l C*'t October 5. 1982 m
h NSID. ISI-154 key. 2 0727W:42/121583 1.. i 6.10.9 Record instrument settings, indication amplitudes (i.e.,
100% FSH + 6dB), and transit times from the water / steel interface (see Note Paragraph 6.10.5) to the indications.
6.,10.10 Draw a horizontal line through the response from the 3/4 inch deep hole on the CRT screen. The curve shall be extrapolated at either end to cover the entire gate length as set in Paragraph 6.10.5.3. .
6.10.11 Adjust the EBS pulse train to follow the DAC over the entire gate length. Record the EBS control settings.
6.10.12 Adjust the monitor gate threshold to the position where a 40% FSH alarm level is realized and set for positive I trigger. !
6.10.12.,1 Disable the EBS, scan the block, and observe the ;
response from the 1/8 inch diameter side drilled { ,
hole at 3/4 inch depth. The amplitude should be ;
at 80% FSH + ldB. If not, review steps 6.10.2 -
l-through 6.10.12.1. l i
l 6.10.12.2 Decrease the receiver gain by 6dB. Switen the j system to the cycle mode and scan the transducer over the calibration block at or greater than !
the examination speed. The gate alarm shall f
actuate when the peak response from the 3/4 inch deep 1/8 inch diameter side drilled hole is detected. If the alarm is not observed, ;
i investigate to identify the test system f l parameter (s) (e.g., alarm count, repetition -
i !
rate, etc.) which may require adjustment and j f' make corrections, if necessary. !,
j !i i
r rus:t .t an ste October 5, 1982 43 cet December 15, 1983 wt rict
"=m'"*'n' . _ - _ _ _ .. .-- -- .
NSID ,
0727k':42/121583 1 151-154 Rev. 2 6.10.12.3' Increase the receiver gain by 6 dB and record j all pertinent calibration data on the I calibration data sheets. l 6.,10.13 Move DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not influence the MTS response amplitudes. Position the transducer to obtain !
the peak responses from at least three cylindrical !
reflectors in the MTS which fall within the gated sweep length. Record the reflector identification, indication amplitude, and transit time to the indication from the initial pulse, j Reflectors selected for this step shall provide transit times representative of the transducer focal distance, :
approximately nine inches in water, j 6.10.14 Examinations shall be performed with the receiver gain at a level where the general noise level from the cladding is !
25% of full screen height. The resulting receiver gain ;
setting shall be recorded on the UT System Controller Data !
l Sheet and identified as " scanning sensitivity". All i mapping of indications shall be at this level. Field j system calibration shall be verified at the receiver gain recorded per paragraph 6.10.12.3.
1 I
6.11 Beam Spread Measurements l
.- Beam spread measurements shall be made for each transducer used- j during the inspection program. Data will be recorded on the appropriate calibration data sheet, f
- i intems areste our October 5. 1982 ace 44 0"E December 15. 1983 '
NSiC 1014 R E V 2183
I
.hNSW 0727W:42/121583 15I-154 Rev. 2 6.11.1 Establish the location of the scribe line on the reference block as a zero reference point.
6.11.2 Position the transducer to obtain the maximum indication
. - amplitude from the applicable calibration hole at the ;
nearest test distance in the appropriate basic calibration block. Record the manipulator-carriage location with respect to the zero reference point and the transit time j to the indication.
6.11.3 Move the transducer toward the reference hole until the indication amplitude drops to 50% of its peak amplitude.
Record the manipulator carriage location with respect to the zero reference point and the transit time to the indication. Move the transducer toward the reference hole until the indication amplitude drops to 20% of its peak amplitude and record data defined above. l 6.11.4 Hove the transducer away from the reference hole until the ,
indication amplitude passes through maximum and again i drops to 50% of its peak amplitude. Record the manipulator carriage location with respect to the zero ,
reference point and the transit time to the indication. !
fiove the transducer away from the reference hole until the ;
indication amplitude drops to 20% of its peak amplitude l and record data defined above.
6.11.5 Repeat these measurements on the other applicable f calibration holes. f l
l
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t * *f:? .I jarsst: '
- "E October 5, 1982 nor 45 . "t December 15, 1983
h NSID- ,
0727W:42/121583 151-154 Rev. 2 !
6.12 Field System Calibration On site the system calibration shall be established and verified with the EBS per Paragraph 6.12.1 at the beginning and end of each scan , routine, with any change of equipment, or every four hours, whichever is less. Calibration shall be established and verified on the MTS cylindrical reflector array per paragraph 6.12.2 at the l
beginning and end of each series of examinations, with any change of ;
equipment, or each week the system is in use, whichever is less.
6.12.1 Enable.the EBS and observe the pulse train.
6.12.1.1 If any point on the DAC curve has decreased by 20% or 2dB of its original amplitude, ;
calibration shall be re-established and all i areas since the previous acceptable calibration f or check reexamined, l 6.12.1.2 If any point on the DAC curve has increased by 20% or 2dB of its original amplitude, calibration shall be re-established and all :
reportable indications since the previous
- acceptable calibration or check reevaluated, i I
i 6.12.2 Disable the EBS function and position the transducer array j such that it is directed toward the cylindrical reflector {
array mounted on the tool O' leg. Each applicable !
transductr/ inspection channel should be checked as follows: ;
I 1
I l
t 8F VfSI D I EutCfwt 46 0'" December 15.198L_ !
c^tt October 5. 1982 _rict PvSiO 1014 ktv.f.)8)
h NSl4 0727W:42/121583 151-154 Rev. 2 i 6.12.2.1 Move DEC Delay 1 to a position past the end of the gated sweep, i.e. where the DEC will not l influence the MTS responses from the MTS reflectors. Position the transducer to obtain the peak responses from each cylindrical reflector in the MTS array used during initial system calibration at the specified waterpaths.
Record the reflector identification, indication amplitude, and transit time to the indication from the initial pulse in microseconds.
6.12.2.2 The recorded values should be compared to the data obtained during the initial calibration at Waltz Mill. ,
6.12.2.2.1 If the response from any reflector has decreased by 20% or 2dB of its original amplitude, calibration shall be reestab- l lished and all areas since the -
I previous acceptable calibration or check reexamined.
I 6.12.2.2.2 If the re'sponse from any reflector has increased by 20% or 2dB of its original amplitude, !
calibration shall be reestab- l' lished and all reportable
- indications since the previous j acceptable calibration or check l reevaluated. .
I l
E8 8!0' .I lAfv5tD Dt October 5, 1982 r i e. , 47 l:str December 15, 1983 I we na sa u n ,
NSID .
-~ 0727W:42/121583 I 151-154 Rev. 2 6.12.2.2.3 If the response from any reflector in the gated sweep i length has moved on the sweep line more than 10% of the sweep reading, correct the sweep range
. calibration and note the correction in the examination record. If recordable reflectors are noted on the data sheets, !
those data sheets shall be voided, the new calibration shall be recorded, and areas relative j to the voided data re-examined. i 6.12.3 Reposition DEC Delay 1 to the delay position established during system calibration. !
I 6.12.4 Verification of the performance of all calibration checks ,
shall be documented. Documentation shall include the ;
date, time, and initials of the operator. See Figure 5.
In addition, the operator shall document calibration l verification at the beginning and end of a weld scan via I
. signature on the computer data printout.
6.13 Transducer RF Waveforms When photographic records of transducer RF waveforms are required, they shall be collected as follows. These records may be made at the calibration facility or at the reactor site. l l
t 6.13.1 Position the transducer to obtain the peak response from j an appropriate reference reflector.
I i
f 8FECts.g l Af v5E D'" October 5. 1982 !ract 48 c'" December 15. 1983 i NOC ICl4 NLv. 2143
NSID.
0727U:42/121583 151-154 Rev. 2 i l
6.13.2 Display the RF waveform on a calibrated oscilloscope.
6.13.3 Adjust the oscilloscope sweep controls to clearly display the waveform.
~
6.13.4 Adjust the oscilloscope veritical display so the amplitude of the response is two to four centimeters.
6.13.5 Photograph the displayed waveform and record all pertinent :
data on the Transducer RF Waveform Data Sheet, Figure 6. !
l 6.13.6 Photographic records of transducer RF waveforms collected after reactor vessel examinations should be made using the !
I same reflector, electronics, waterpath and instrument settings as used prior to the examinations when practical. ,
I t
7.0 EXAttINATION REQUIREMENTS {
7.1 The following activities shall have been completed prior to the performance of any in-field ultrasonic examination of a reactor l vessel using the remotely operated inspection tool.
7.1.1 The reactor vessel Examination Program Plan identifying l specific plant inspection parameters such as search unit i incident angles, calibration standards, water paths, scan !
lengths, scan locations, and scan increments shall have been prepared in accordance with WNSID Procedure RV-ISI-01, e i
7.1.2 The ultrasonic equipment shall have been calibrated for ,
l all examinations required by the Examination Program Plan i and all data recorded in accordance with paragraph 6.0 of !
this procedure. !
i l
l l l
l l !
l ent c ot tu.t i !arvste October 5. 1982 l uct 49 :D"i December 15. 1983 w e m atv ries
NSlQ ,
0727W:42/121583 i 151-154 Rev. 2 7.1.3 The reactor vessel inspection tool shall have been ;
assembled in the configuration on the arrangement drawing i applicable to the specific vessel being examined as listed '
in the Examination Program Plan. t l
I 7/1.4 Prior to placing the inspection tool on the reactor vessel, the following tests and checks shall be performed !
to demonstrate the tool is fully operational and to assure the tool can be safely set on the reactor vessel. ;
7.1.4.1 Establish "home" position and record all resolver readings and other relevant data.
Mechanically measure the distance from the face of transducer zero (TR0) er transducer twenty (TR20) to the spherical target and record this ,
value.
7.1.4.2 Test to ensure that all drives are functional both in manual and computer control. !
7.1.4.3 Visually verify that all appropriate hardware is ,
properly secured by lockwire or other suitable l
. means.
7.1.4.4 Check each transducer and associated pulser /
amplifier channel by tapping on the face of the transducer and observing the initial pulse, i 7.1.4.5 Cavity water clarity shall be adequate to assure visibility of the vessel flange, keyways, and/or core barrel seating surface. ,
i l
l i
e taetet..t i an'tt o catt Cetober 5. 1982 ric,e 50 ltt Deterier 15. 1083 we w u t v a m
7,r NSID- ,
0727W:42/121583 l 151-154 Rev. 2 i
i 7.1.4.6 Verify that no specimen capsules are installed l
where the inspection tool legs will seat.
7.1.5 The calibration settings of each transducer /instrumenta-tion system shall be checked using the data previously entered in the Electronic Block Simultor (EBS) with the Sonic system control settings as defined on the Calibra-tion Data Sheets for each examination to be performed.
7.1.6 Once the inspection tool is set on the reactor vessel the tool home position shall be verified by monitoring the TRO or TR20 straight beam inspection channel and positioning the search unit to obtain a peaked response from the spherical target without changing waterpath from that set mechanically in 7.1.4.1. Contact the control room, obtain the refueling water temperature, and record this value on a form similar to the one shown in Figure 7. If the temperature is not within + 25'F of that used during calibration, advise the control room to notify when temperature is within this range. Alternately, water j
temperature may be measured directly with a thermometer, j not considered MTE equipment. Mercury thermometers are l not acceptable for this application.
7.1.7 Calculate the water velocity, record this value, and compare with that determined during systen calibration. ,
l 7.1.8 Check the instrument calibration and system calibration. !
l 7.2 Prior to initiating a scan per the Examination Program Plan, the flange area shall be subject to preliminary scans while monitoring ;
the TRO'or TR20 inspection channel to determine that the tool is properly centered, level, and that water paths (compensated for difference in water velocity, if necessary) correspond with those used during calibration. ,
i E88tCNt Afu$tD l
D t October 5, 1982 raer 51 o^it December 15. 1983
% re:4 uv : su
NSID- ,
0727W:42/121583 151-154 Rev. 2 I i
l 7.3 The area to be examined shall be subject to a preliminary scan while !
monitoring the TRO inspection channel to determine the thickness of the examination area. Ultrasonic thickness readings for each applicable exam catagory shall be recorded on a form similar to the l one s_hown in Figure 8. Use this information to verify that all gates have been set properly. If gating adjustments are necessary at any time during the examination they shall be documented. See j Figure 9. :
i 7.4 Each area of the reactor vessel identified in the Examination Program Plan shall be scanned in accordance with the requirements of the Examination Program Plan.
7.4.1 The computer "home" routine shall'be used to determine the actual reference position for the nine axes of tool ,
I movement at least once each day. When a computer "home" '
is achieved, a peaked response from the spherical target j should be observed on the TRO or TR20 inspection channel i and the axes resolver readings shall be noted and compared {
with those original values recorded per paragraph 7.1.4.1.
)
7.5 During scanning the following parameters shall be maintained unless otherwise specified in the Examination Program Plan.
7.5.1 Scanning shall be conducted at the calibration sensitivity.
7.5.2 The rate of search unit movement shall be 5 inches per '
second maximum. ;
I 7.5.3 Scan increments shall be three-quarter inches maximum for 1-1/2 inch diameter transducers and three-eighth inches l maximum for 3/4 inch diameter transducers. !
l torc nr at est e -
^tt December 15. 1983 !
C October 5. 1982 not 52 est.C, acid #Ev 2 1-83
h NSID 151-154 Rev. 2 0727W:42/121583 i'
7.5.4 The required examination volume for welds shall include the weld, both heat affected zones, and one-half the weld thickness of adjacent base material on both sides of the weld.
~
7.6 The following paragraphs provide general scanning requirements for each area of the reactor vessel. Specific requirements are provided
, in the Examination Program Plan.
7.6.1 Base Metal Examination When specified in the Examination Program Plan, the base metal through which angle beams will pass shall be completely scanned by straight beam to detect laminar reflectors where practical. '
7.6.1.1 Sensitivity shall be established at a locat'on free of indications by adjusting the first back j surface reflection to 80% FSH. l, 7.6.1.2 Set the back wall gate to monitor the back j surface reflection and alarm when the echo !
amplitude drops to 16% FSH. l 7.6.1.3 Alternately, the base metal examination may be ,
conducted as an extension of straight beam !
examination in accordance with paragraph 7.6.2.1 !
provided the sensitivity is at least that required in paragraph 7.6.l.1 and the gating and alarm requirements of paragraph 7.6.1.2 are employed. j i
I i
. i i t srt ** .t l lEFUSED I i
hat October 5. 1982 l eie,t 53 l_ c '" December 15. 1983
.s i .:.4 6tv. n u -
,h NSID 0727W:42/121583 151-154 Rev. 2 I 7.6.2 Vertical 'and Circumferential Vessel Welds I The extent of each reactor vessel vertical and/or circumferential weld identified in the Examination Program
- - Plan shall be examined in accordance with the following requirements where practical.
7.6.2.1 The entire weld, botn heat affected zones, and specified adjacent base material are examined k from the vessel ID by longitudinal waves at O*.
7.6.2.2 The entire weld, both heat affected zones, and i specified adjacent base material are examined l
from the vessel IC by transverse waves at two angles, the difference between which shall be at '
. least 10*, in two opposite directions parallel to the weld and two opposite directions perpendicular to the weld. For purposes of minimum required coverage, adjacent base material need not be examined with both angle ,
beams in both directions. Any combination of j two angle beams will satisfy this requirement. I 7.6.3 Reactor Vessel Flange-to-Upper Shell Weld The extent of the reactor vessel flange-to-upper shell weld identified in the Examination Program Plan sball be examined in accordance with the following requirements ,
- where practical.
l E 8 8 E CNE M v:$E 0 DATE October 5. 1982 **cr 54 D'il December 15. 1983
e o -
hSl0 0727W:42/121583 N 151-154 Rev. 2 i
7.6.3.l~ The reactor vessel flange-to-upper shell weld, l both heat affected zones, and specified adjacent l 1
base material are examined from the vessel flange seal surface using longitudinal waves at anoles as defined in the Examination Program Plan.
'7.6.3.2 When the core barrel is removed the flange-to-upper shell weld may be examined from the vessel ID in accordance with Paragraph 7.6.2, except angle beam scanning perpendicular to the weld ,
will be performed from the vessel shell side only.
7.6.4 ReactorYedelNozzla-to-ShellWelds ;
i, -
The extent of each reactor vessel nozzle-to-shell weld I identified in the Examination Program Plan shall be examined in accordance with the following requirements ,
where practical. .
i ,
x 7.6.4.1 The reactor vessel noztle-to-shell weld, both heat affected zones, and specified adjacent base material are examined from the nozzle bore using i angles and modes as defined in the Examination Program Plan. ,
n NOTE, RHR J1ow should be off'or reduced to the extent possible during this examint_ tion. Water clarity shall be such that tne nozzle opening is clearlyvisible from the operating ,
l ;
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t n a c3,4 l cnt October 5, 1982 rer 55 eer December 15. 1983 i n.b..Y u t v r+n y _ _ _ _
h NSID' ,
151-154 Rev. 2 0727W:42/121583 i
7.6.5 ~ Nozzle Radius and Protrusion l l
The extent of each nozzle radius or protrusion identified in the Examination Program Plan shall be examined in accordance with the following requirements where practical.
7.6.5.1 The entire area defined by the Examination Program Plan is examined from the nozzle ID by !
transverse waves in both circumferential directions.
NOTE RHR flow should be off or reduced to the extent possible during this examination. Water clarity shall be such that !
the nozzle opening is clearly visible from the operating deck. ;
l, 7.6.6 Nozzle-to-Safe Ends Welds t
The extent of each reactor vessel nozzle-to-safe end weld ;
identified in the Examination Program Plan'shall be examined in accordance with the following requirements where practical, j i
7.6.6.1 The entire weld, both heat affected zones, and I
~
specified adjacent base material are examined !
from the nozzle bore by longitudinal waves at O'.
. 7.6.6.2 The entire weld, both heat affected zones, and j specified adjacent base material are examined f from the nozzle bore by angled longitudinal waves in two directions parallel to the weld and two directions perpendicular to the weld.
f,7f CMt RF \"$ t 0 c t 56 D^tt Decenbir 15. 1983 October 5. 1982 raci we ici.f tv :m -
W NSl0 ~
0727W:42/121583 ,
151-154 Rev. 2 i i
i I '
NOTE 1
RHR flow $hould be off or reduced ~to the extent possible j during this exancination. Water clarity shall be such that the nozzie'openir:g is clearly visible from the operating Jdeck. ,- , 7-7.6.7 Reactor Vessel Flange 1.igamertjf f
The extent of the threa' ded ligaments in the reactor vessel
, /
flange identified in:the Examination Program Plan shall be examined in accordance wittithe fol1$ wing requirements where practical.' ', i
+ '
, 7.6.7.1 The ligaments bitsveen threaded stud holes are
- examined'fron trie top of the flange using -
~
-. - longitudinal waves ~at 0*.
< ~ /
7 '
7, ff..8 Full Node Angle Beam Examination of Vertical and 7 grcumferential Vessel Welds
- i
- I, _
Ii '
When full/
node angle beam examinations are specified, the g /
extent'oficach~ reactor vessel vertical and/or
( circumferentf31 se,ld i antified in the Examination Program Plan shall be eraniined in accordance with the following i requirementswhebepractic'a1.
, >J
... I.
- 7.6.8.1 . Tee yolur{e of material including the weld, both
!heataffectedzones,andspecifiedadjacentbase
/ / , .
. ' material within 1/BT of tne vessel ID'shall be . ,
/ examined S two directiiobs,parallbl to the weld ,
and two direct' r1 ions trarsverse to_the weld. - l f
I O , l E 5 ' E C .1 - / M v:SE C mE October 5, 1982 im 57 m E~ December 15, 1983 l
+ s. 2e:4 ccv rw
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' . e l. . <_. ,l. ,- t . ._ . - . ._ ,
W NSID, .
~
0727W:42/121583 i 151-154 Rev. 2 i I
i
'7.6.9 Near Surface Examinations of Vertical and Circumferential ,
Vessel Welds When near surface examinations are specified. the extent j of each r'eactor vessel vertical and circumferential weld -
identified in the Examination Program Plan shall be examined in accordance with the following requirements l where practical.
7.6.9.1 The volume of material including the weld, both heat affected zones, and specified adjacent base ,
material within one inch of the vessel ID shall be examined in two directions parallel to the weld and two directions transverse to the weld. . !
7.6.9.2 Refer to paragraph 6.10.14 for examination sensitivity adjustment based on clad noise.
8.0 INTERPRETATION AND INVESTIGATION l S.1 The Level II or Level III examiner shall interpret indications in accordance with criteria listed below such that he can assess their l being valid or not valid. l t
l I
8.1.1 The interpretation and investigation level is 50% of the -
primary reference DAC for:
8.1.1.1 All indications detected during straight beam L ..
examinations of vertical and circumferential welds.
t AFv:SEO E5FEthvE 58 NE December 15. 1983 DE October 5. 1982 ract [
N51D 3 014 k[ V. 218 3 ~ r
W NSID 0727W:42/121583 151-154 Rev. 2 i 8.1.1.2 Indications detected during angle beam examinations of vertical and circumferential welds at transit times representing 25 percent and greater of the vessel through-wall thickness
.. ~
measured from the inner surface.
8.1.1.3 Indications detected during examinations of the flange-to-upper shell weld from the seal surface ;
at locations representing 25 percent and greater i of the vessel through-wall thickness measured from the inner surface. '
8.1.1.4 Indications detected during examinations of nozzle-to-shell welds from nozzle bores at i locations representing 25 percent and greater of '
l the vessel through-wall thickness measured from ,
the inner surface.
8.1.1.5 All indications detected during straight and l 1
angle beam examinations of nozzle-to-safe end
- l l welds. !
! 1 8.1.1.6 All indications detected during examinations of j reactor vessel flange ligaments. ; !
I 8.1.1.7 All indications detected during full node angle !
beam examinations of vertical and I ;
circumferential welds.
8.1.1.8 All indications detected during near surface examinations. ,
j ,
' e rt :7..t arv sto .
ic"E Oct'ober 5. 1982- uct 59 o"E December 15, 1983 !
ss :c:4 uv a .3 . .
, T. NSID s 0727W:42/121583 151-154 Rev. 2 8.1.2 The interpretation and investigation level is 20% of the j primary reference DAC for: l ,
8.1.2.1 Indications detected during angle beam j
.. . examinations of vertical and circumferential '
welds at transit times which represent the inner l
25 percent of the vessel through-wall thickness !
measured from the inner surface. ,
I 8.1.2.2 Indications detected during examinations of the flange-to-upper shell weld from the seal surface at locations which are within 25 percent of the vessel through-wall thickness measured from the f inner surface. t 8.1.2.3 Indications detected during examinations of nozzle-to-shell welds from nozzle bores at !
locations which are within 25 percent of the !
vessel through-wall thickness measured from the inner surface.
8.l.2.4 All indications detected during examinations of nozzle radii and protrusions.
8.1.3 The interpretation and investigation levels for the base ;
material examination are defined as follows:
8.1.3.1 All areas where indications are equal to exceed
, the amplitude of the remaining back reflection. ,
8.1.3.2 All areas that produce a continuous total loss of back reflection accompanied by a continuous ,
indication in a singular plane. i Eng ewe nrvst:
DME 60 D"E December 15. 1983 October 5. 1982 nct NLD 1014 R E V 2383 , _
W NSID.
0727W:42/121583 151-154 Rev. 2
) i 8.2 Valid indications are the result of flaw reflectors such as cracks, j lack of penetration, lack of fusion, inclusions, slag and porosity. l All other indications are considered not valid, including those due to: scanning noise, grain structure, beam redirection, loss of interface gating, spurious noise from electrical sources, clad
~
interface, straight beam back surface, mode conversion and geometric reflectors. :
l 8.3 Valid indications meeting the criteria of paragraphs 8.1 and 8.2 ;
shall be investigated by the examiner in terms of the recording requirements in paragraph 9.0.
8.4~ Other transducers, search units, frequencies, techniques, etc., may
'be used to aid interpretation and investigation. .
9.0 RECORDING REQUIREMENTS 9.1 All indications shall be identified as. valid or non-valid on the data printout. ~ Valid indications having amplitudes which equal or ,
i exceed the appropriate interpretation and investigation level within i the OD and ID boundaries of the area being examined shall be recorded per the additional requirements of Paragraph 9.4. Valid indications having amplitudes less than the appropriate i i
interpretation and investigation level need only have peak ,
amplitudes noted on the data printout. i ,
9.2 The " Flaw Detect" data acquisition system provides the following information.
I 9.2.1 A digital readout defining the location of each of the !
nine axis of tool motion.
I 1
EI S .I I AfoSEC NE October 5, 1982 Iract 61 DATE December 15. 1983 mi 2::. & c v :.2.e3 -
W NSID- ,
0727W:42/121583 ! 151-154 Rev. 2
, i 9.2.2 Identity of the inspection channel. ,
I L 9.2.3 The number of indications exceeding the primary reference ,
level. i i
9.2.4 A digital readout in microseconds of the transit time to the indication (s) referenced from the channel 0 interface .
i position. !
l 9.2.5 The indication amplitude (s) in percent of FSH.
9.3 For examinations of nozzle-to-shell welds from the nozzle bore, "A" scan data will be permanently recorded on videotape f.or review and interpretation in lieu of use of the " Flaw' Detect" data acquisition system. The Sonic Mark VI display or an auxiliary scope may be used. Operation of the system is described as follows:
i 9.3.1 Adjust the Sonic Mark VI delay and range controls such !
that the artificial interface marker, set at the transit
{
time defined during system calibration, f alls on the first !
I major screen division (10% of sweep length) and the end of ,
the gate set, as a minimum, at the length defined during
- system calibration, f alls on the ninth major screen i i
division (90% of sweep length). l 9'3.2 Calculate the Sonic Mark VI horizontal sweep calibration j in usec/div at those sweep settings.
i 9.3.3 If "A" scan data will ce recorded from an auxiliary scope in lieu of the Sonic Mark VI, paragraphs 9.3.3.1 through !
9.3.3.4 are applicable.
l t
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b"E October 5, 1982 _rAst 62 b^'t December 15. 1983
- NSID 1:34 EEv 2383 . - -, ,
, ?] NSID ,
0727W:42/121583 151-154 Rev. 2 l
.t. i !
- j. 9.3.3.1 Establish an EBS pulse train to start at the i
sweep location described for the artificial interface and end at the sweep location j [
described for the end of the gate. ;
9.3.3.2 Calibrate the sweep of the auxiliary "A" scan i oscilloscope as follows. Adjust the sweep delay ;
and range controls of the auxiliary "A" scan i oscilloscope until the EBS signals described in j 9.3.3 are at identical sweep locations as on the !
Sonic Mark VI. After this adjustment is made, f tape down the horizontal fine adjustment knob. ;
The horizontal sweep calibration (usec/div) of !
the auxiliary "A" scan oscilloscope is then the !
same as that determined for the Sonic Mark VI in l paragraph 9.3.2. j 9.3.3.3 Calibrate the vertical scale of the auxiliary ;
"A" scan oscilloscope as follows. Adjust the ;
. EBS attenuatipn controls to obtain a 100% full screen height response for one EBS pulse on the ;
Sonic Mark VI. View this same EBS pulse on the, auxiliary "A" scan oscilloscope and adjust the ;
vertical scale such that the amplitude is also 100% of full screen height. After this adjustment is made, tape down the vertical fine q t l adjustment knob. ! ,
i A
i 9.3.3.4 Check the vertical linearity of the auxiliary {
l "A" scan oscilloscope per paragraph 5.2. l l-3 Field calibration checks with the EBS shall be recorded at I 9.3.4 ,
i
, the beginning and end of each nozzle examination. '
I j. i
- l. i l 1 igarg;n,g nF esty lo"E October 5, 1982 nar 63 ont december 15, 1983 ;
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0727W:42/121583 { 151-154 Rev. 2 9.3.5 The following information, as a minimum, shall be prominently displayed on the recording. ;
9.3.5.1 Plant identification. i t
9.3.5.2 Nozzle identification.
9.3.5.3 Transducer / channel identification. i 9.3.5.4 Artificial interface transit time and sweep position on the auxiliary display.
9.3.5.5 Gate delay and length. Specify the gate end sweep position on the a*uxiliary display.
9.3.5.6 Sweep calibration in usec/div. l ,
9.3.6 "A" scan, tool position, and timing information shall be { ,
permanently recorded for scans of nozzle-to-shell welds l '
from the nozzle bores performed per paragraph 7.6.4. l ,
3 9.4 The' following additional information shall be generated and recorded 'I on. an indication data sheet, Figure 10, for each valid indication ,
recorded in terms of a distance-amplitude-curve per paragraphs 8.1.1 l and 8.1.2. Prior to recording indications with a particular I
transducer / inspection channel, calibration and instrument linearity j ;
shall have been verified within the periods specified. ,
i
.9.4.1 Maximum indication amplitude in percent of the DAC <
calibration curve, search unit location as defined by the ! !
nine axis of tool motion, and transit time from the water / !
steel interface to the indication. i 1
! I i r
. October 5, 1982 64 78 ' December 15, 1983
$'t o ,,y l N51C 1014 R t v 2 3 8 3 __ _ _ ___ _ __ _ _
NSID Of27W:42/121583- l 151-154 Rev. 2 i i
9.4.2 Jog the search unit toward the reflector. Where a 20% DAC ;
interpretation and investigation level is specified, !
record the search unit location as defined by the nine axes of tool motion and transit time from the water / steel I interface to the indication for positions where the I indication amplitude drops to 100% DAC, half-maximum amplitude (for indications with peak amplitudes exceeding 100% DAC), 50% DAC, and 20% DAC. Where a 50% DAC i i' '
interpretation and investigation level is specified, this information shall be recorded for the 100% DAC, half-maximum amplitude (for indications with peak amplitudes exceeding 100% DAC), and 50% DAC positions only. ,
9.4.3 Jog the search unit away from the reflector. Where a 20% r DAC interpretation and investigation level is specified, I record the search unit location as defined by the nine axes of tool motion and transit time from the water / steel interface to the indication for positions where the !
indication amplitude drops to 100% DAC, half-maximum amplitude (for indications with peak amplitues exceeding -
l 100% DAC), 50: L4,and 20% DAC. Where a 50% DAC I interpretation and investigation level is specified, this information shall be recorded for the 100% DAC, half-maximum amplitude (for indications with peak amplitudes exceeding 100% DAC), and 50% DAC positions only. ,
r l 9.4.4 Jog the search unit back to the ares of maximum amplitude l and peak.the indication. Where a 20% DAC interpretation l and investigation level is specified, the length of the j reflector shall be determined by scanning along the reflector's major dimension and recording search unit-locations as defined by the nine axes of tool motion where the indication amplitude drops to 100%, 50%, and 20% of the DAC curve. Where a 50% DAC interpretation and investigation level is specified, this information shall fI I
be recorded for the 100% and 50% DAC positions only.
E S T E C NT Afv$E0 '
oE October 5, 1982 rict 65 DATE December 15, 1983
~ ~
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0727W:42/121583 l
'ISI-154 Rev. 2 I
9.5 Valid indications 1,dentified during the base material examination per paragraph 8.1.3 shall be recorded on the data printout in terms of transit time to the indication, peak indication amplitude, and i length and width measurements taken from the points at which !
I indication and backwall amplitudes are equal.
9.5.1 Areas identified per paragraph 8.1.3.1 shall be investigated to determine if and to what extent they interfere with angle beam examinations. Where reflectors do interfere, the angle beam technique (s) shall be reviewed toward achieving at least the minimum required coverage of the volume to be examined, and modified to the extent necessary and practical to accomplish this.
9.5.2 Areas identified per paragraph 8.1.3.2 shall be investigated in terms of the appropriate acceptance ,
criteria for laminar reflectors.
9.6 Disassembly of the inspection tool shall not commence until all !
recorded indications have been assessed in terms of the applicable , ,
code criteria, and results are recorded on an indication analysis '
table similar to that shown in Figure 10.
i l
10.0 EXAMINATION RECORDS j The following information shall be provided to document the examinations. ,
10.1 The test procedure ,
10.2 Description of the test system 10.3 Calibration records !
[, E, *E October 5, 1982 66 ",QSEO
/ December 15, 1983 N 5tC 10;4 kE v 2 1 4 3
v3 NSID 0727W:42/121583 151-154 Rev. 2 I i a
10.4 Identification'and location of extent of areas examined i 10.5 Record of all indications recorded 10.6 Re, cord of all evaluations of indications 10.7 Personnel certifications i
10.8 Dates and times of examinations 10.9 Basic calibration block identification 10.10 Couplant 10.11 Surface condition and surfaces from which examinations were j performed.
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FIGURE 7 l REvtSED December l$, 1983 f"TEECT14
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