ML20090L662
| ML20090L662 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 01/01/1975 |
| From: | Lambert T NORTHERN STATES POWER CO. |
| To: | |
| Shared Package | |
| ML20090L649 | List: |
| References | |
| NUT-NC-1A, NUDOCS 9102120491 | |
| Download: ML20090L662 (18) | |
Text
.
see NUT-NC-1A SPECIAL PROCESS STANDARD L
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..e.,e Nuclear Ultracenic Testinc Procedure T. C. Lambert 1/1/75 January 1,1975 Ultrasonic Inspection of Velds, in the 1/h" to 2-1/2" Thickness Bange.
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1.1 This document covers the ceneral procedure and requirenents for ultrasonie examination of velds in Nuclear Reactor Piping Systems, and neets the requirements of the AS!E Code,Section III, Appendix 9, Paragraph 3kOO and,Section XI of the AS!E Code.
2.0 SPECIFICATIONS.
2.1 The indicated revision of the following specifications shall ferm a pa.*t of this document.
2.1.1 AS!E code Section 111 Nuclear Vescels (Curzer 197L Adder,da).
2.1.?
AS!E Code Section XI Pules for Inservice Inspection of Nuclear Reactor Coolunt Systems (Sumer 197h Addenda).
2.1.3 ASME Code Section V Ncndestructive Examination (Sumer 297h Addenda).
2.2 Othe: Specificatiens 2.2.1 ASTM E11b F.econsended Prsctices for UT.
2.2.2 ASTM A-386 UT of iteavy Steel Forcings.
2.2.3 ASNT-TC-1A Qualification and Certification of kn-destructive Testing Personnel, Supp. C.
2.2.h NVI-PQ-1 Nuclear Services Corporatien Personnt<1 Qualification Procedure..
2.2 5 NUT-NC-3 Procedure for Automatic Recording of Ultrasonic Test Data.
2.2.6 NUT-NC-1E
'J1trasonic Testing Calibration Procec.ure.
30 PERSONNEL QUALIFICATIONS _
31 All personnel engaged in %trasonic inspection shall be qualifird in accordance with ASlE C % requiren:ents as either Level I (optrator). -
Level II (inspector), or L vel III (examiner) as defined in SNT-TC-1A, Supplement C and NUT-PQ-1, Fev. O.
Only a Level II Inspector or Level III Examiner shall take !M.7.ent as to the acceptance or rejection of indications.
The Nuclear Cervices Corporation Level III Exan.iner vill submit to the Purchaser, %Vn request, a copy of personnel qualifica-i Q2120491 750624 p
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NW-NC-1 A, Bev.h l
SPECIAL PROCESS STANDARD 2
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l 31 (continued) tions and qualified ultrasonic procedures.
Personnel shall, at the request of the Purchaser, demonstrate their knowledge and understanding of pertinent specifications and procedures, and their ability to satisfactorily operate all required equip-
[
ment prior to performinE an ultrasonic inspection. The job i
shall be provided with adequate equipment to perform and fulfill j
the contractuni requitecents. It shall be the resronsibility of j
Nuclear Services Corporation to set up the equipn.ent, perfcra the l
examination, interpret the results, and map) reports.
Final reports shall be cubmitted to the Purchase
'or disposition.
3 1.1 Certification of Personnel to NW-F-requirements shal) be directed by the Nucient Servicce tporation Authorised l
Level III Examiner.
3 1.2 Level III Exte.iners appointed by Nuclear Services Corport.tien t
- r. hall conform to SNT-TC-1A, Supplement C and the Nuclear Services Corporation Personnel Qualification Procedure, NUT-PQ-1.
32 Personnel Certifiention 1
3 2.1 Certification of personnel ahall conform to SNT-TC-1A, Supplement C and Nuclear Services Corporation Personnel Qualification Procedt.re, NW-PQ-1.
32.2 In order to attain certific.stion in any IcVel, the candidate must demonstrate to the Nuclear Services Corporstion Level III Examiner's satisfaction a thorough knowledSe of the ptocedures and requirements contained in this document.
t 3.3 Visual Acuity Recuirement,z, Visua'. requirements for near distance acuity and color t, hall con-form to SNT-TC-1A, Supplement C and Nuclear Services Corporation Personnel Qualification Procedure, HUT-M-1.
3.h Recort.s 3.h.1 Eecords of personnel certification, including ecpies of tect results, eye examination results, and certification 'docu-ments, shall be maintained by the Nuclear Services Corpornt ion Level III Examiner at the home office and at the job site and shall conform to SNT-TC-1A, Supplement C and Nucicar Services Corporation Personnel Qualification Procedure, NUT-PQ-1.
NUCLEAR SERVICES CORPORATIO.N
a NUT-NC-1A. Fev.h SPECIAL PROCESS STANDARD "ei 3
or 17 i
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a h.0 INCPECTION METH0fB f
i The method used to fulfill the inspection requirerents shall be the l
Pulse Echo Method.
1 J
h.1 Pulse Echo idethod j
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)
This method consists of transmitt2ng a sound beam inO a specimen and interpreting the returned echos.
Pulse Echo Testing shall be j
conducted using either strair.ht benn or an61e beam techniques.
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$0 SCAtmING TECHNIQUE Scanning shall be performed manually by coving the search unit in a A
directed path at a naximum scanning rate of 6 inches per sceend.
j minimum of 15 per cent overlap shall be used.
j 1
j
$.1 Contact Scanning j
This method requires the search unit to be placed in direct contact with the specimen surface.
A coupling fluid is re-a quired to make effective contact between the search unit and the specimen surface.
5 1.1 Coupling Fluids I
For the sound beam to be transmitted into the specimen, l
the surface of both the tra.nsducer and the specimen must r
l be vet by a transmission n.edium.
A vater base halogen free couplant shall be usect for contact t'esting and the type recorded on the inspection report.
1 I
6.0 SURTACE REQUIRDtENT The surfaces of material for inspection shall be clean, uniformly smooth, j
and free of surface defects such as laps, veld splatter, or irregularities j
that vould interfere with free movement of the search unit or impair the i
transmission of ultrasonic vibrations.
The surface of a veld should i
I merce smoothly into the surfaces of the tijacent base material.
70 ULTRASONIC EXAMINATION OF BUTT VEL 11S IN THE 1/h" to 2-1/2" THICKNESS EANGE t
71 Welds shall be exar.ined by the ancle beam method where practical.
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In the examination of veldments where ceometry does not allov ancle beam examination from both sides of the veld from a sinc.le l
surface or a combination of surfaces, either a combination of ancie j
beam and straight beam or straight beam in two (2) directions at 90 degrees to each other shall be used, i
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Nf-HC-1A, Bev.h SPECIAL PROCESS STANDARD
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l 72 Calibration Reference Perleeters Side drilled holes shall be used as basic calibration reflectors
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to establish the primary reference response of the equipment and to construct a distance-amplitude correction curve. These holes shall be located either in the production material or in a basic calibration block of an equivalent P-number grouping ecnforming 4
to Figure 1.
7 2.1 Pasic Calibratien Block (Figure 1 and 6)
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If a basic calibration block is used, it shall have a thickness related to the production material thickness, j
according to the table of Figure 1.
Where two or more thicknesses are involved, the calibration thickness shal]
be det mined by the thickness of the production materia) to which the search unit is applied.
For exa.ination of q
circumferential velds on material with contact surface 1
curvature greater than 20 inches in diameter, flat, basic j
calibration block or blocks of essentially the same curvt.-
1 ture as the part to be examined shall be used. The basic calibration block contact surface shall be curved for material contact surface curvatures less than 20 inches in diameter. A curved basic calibration block shall be i
l used to calibrate the examination on contact surfaces in the range of curvature from 9/10 to 1-1/2 times the basie calibration block diameter. For example, the 8 inch diameter curved block may be used to calibrate the examir.a-i tion on materini contact surfaces in the range of curvattres from 7 2 to 12 inches in diameter.
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7 2.2 Basic Calibratien Holoc Basic Calibration Holes shall conform to Figure 1.
i 723 Portable Calibration Cheek Block
)
An IIW-2 block or similar portable block containing side i
drilled holes may be used es a calibration stability reference, where the use of the basic block is not feasible.
7 2.h Calibration Procedure
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r Calibration and Calibration Recording Procedures are con-i tained in Nucicar Services Corporation Procedure Wf-NC-3E.
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SPECIAL PROCESS STANDARD
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73 Angle Beam Method _
u 7 3.1 Before angle beam examination is attempted, the volume of 1
the base material throuch which the sound vill travel in angle beam examination shall be completely scanned with a i
straight beam search unit to detect reflectors which might affect the interpretation of angle beam results.
Considera-
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tion must be given to these reflectors during interpretation of veld examination results, but their detection shall not be a basis for rejection of the base material.
7 3.2 Calibration of Fouipment for Angle Pen.m Testinc 1
a) Transducer Frequenev and Size
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The nominal transducer frequency shall be 2.25 141t i
unless large grain structure or Eeccetry necessitate the j
use of other frequencies. The maximum size of the trane-ducer shall te 1" by 1".
b) Beam Angle The beam angle in the production material shall be in the range of k0 degrees to 75 degrees.
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c) Distance-Amplitude Correction 1
Compensati' n for the distance traversed by the ultrasonic o
j beam as it passes throuch the material shall be provided l
by the use of correcticn curves as described below:
)
i d) Determinatien of the Distance Arplitude Correction C trve
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for Angle Pene Testing l
1 1.
Nodal Method 1
i Distance-amplitude correction curves (see Ficure 2) j shall to constructed by utilizing the recponses frem j
the basic calibratit.n holes escribed in 71.2.2.
The first point on the curve is obtained by placing the search unit as near the basic calibration ho?.e l
as possible and adjusting the tester cain for maximum response at 75 por cent of full scale. This is the primary reference response. Without changing the gain, j
the search unit shall be placed similarly at other nodal positions, and the sweep ndjusted to diophy 2-1/2 nodes to extend the calibrated examination into 3
the half node region.
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NUT-NC-1A, Pev.h SPECIAL PROCESS STANDARD
. 6.
6 or 17 7 3.2 (continued) 2.
Multiple Hole Method Multiple calibration hoics may be drilled, covering the conter: plated examination distance ranse and the corresponding responses rearked on the screen.
Thue points shall be joined by a smooth line, the length of which shall be sufficient to cover the examination range.
e) Inspection parameters, a, b, and c shall be recorded on suitable forms.
f)
Calibration shall be performed on a daily basis before each any's examinations and checked before and after each exam-ination, and at least every b hours during examinatien.
1.
If a check indientes a change in system response recalibration is requ' red.
i g) Calibration and Calibration recordinc procedures are een-tained in Nuclear Services Corporation procedure NUT.NC-1E.
7 3.3 Referer.ce sensitivity Level i
The reference level for monitoring discontinuities is th<
j primary reference response corrected for distance by the Distance Amplitude Correction curve.
7 3.h Scanninc Sensitivity level e
When possible, scanning shall be performed at a minimum gain
]
setting of two times the reference level sensitivity.
735 coverage Where possible, velds shall be examined from both sides of
)
the veld (usually from one surface only).
i 7351 Detection or Defects para 11c1 to the veld 1
The search unit shall be placed on the contact sur-face with the beam aimed at the veld at about 90 degrees and manipulated laterally and lone.itudiria]1y so that the ultrasonic beam passes through all rf i
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NUCLEAR SERVICES CORPORATION
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SPECIAL PROCESS STANDARD
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7 3 5 1 (continued)
I the veld metal in two different approaches of j
the beam, i.e.. from both sides of the veld.
Techniques employing two search unito may be 3
1 used to detect lack of penetration in double f
velded butt joints (cee Figure 3).
7 3 5 2 Detection of Defects Transverse to the Weld i
j Two search units shall be placed on the contact t;ur-j faces adjacent to the veld, one on each side, mahinc an angle of h5 degrees or lecc with the axis of the i
veld with the beam directed along the veld in such I
a manner that the entire depth and vidth of the veld is scanned (see Figure b). Alternatively when the 1
veld surface is suitable, one transducer n.ay be placed on the centerline of the veld and manipulated.
j so that the centerline of the beam covers the entire veld volume.
)
l 7.h Straicht Beam Method h
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7.h.1 Calibration of Ecuiteent for Straicht Beam Testinc i
a) Transducer Frecuenev ar.d Site The nominal frequency t. hall be 2.25 M!z unless grain i
i structure or geometry r.ecescitate the use of other frequencies. The maximum size of the traneducer chall be one square inch.
i b) Distance-Amplitude Coryection i
A distance-amplitude ccrrection curve need not be con-l structed when the thickness of material is one inch or i
less. For greater thicknesses, using the proper basie i
calibration block (cee Figure 1), position the search j
unit for maximum response from the basic calibration hole at 1/hT (see Figure 5). Adjust the signal ampli-l tude to 50 per cent of full screen.. This is the primary l
reference response. Without changing the gain control, position the search unit for maximum responce from the basic calibration hole to 3/hT and markc its amplitude i
on the screen. Join the two points with a straight line and extend its length to cover the test rance (ceo j
Figure 5).
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NtTf-NC-1A, Rev.h l
SPECIAL PROCESS STANDARD
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j 7.h.1 (continued) c) Inspection parameters a and b shall be recorded on i
suitable forms.
1
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d) Calibration shall be performed daily before each days' 1,
examinations and checked before and after each examina-j tion.
l e) If a check indicates a change in system response, re-t 1
2 calibration is required.
f) Calibration and Calibrt. tion 11ecording procedures are contained in Nuclear Services Corporation procedure NtTf-NC-1E.
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7.h.2 Reference Sensitivity level i
The reference level for monitoring discontinuities is the primary reference response corrected fer distance by the 3
distance amplitude curve.
7.k.3 Scanning Sensitivity Level l
When possible, scannin6 sht.11 be performed at a minimum gain setting of two (2) times the primary reference level.
7.h.h Verifiention of Fenetratf org i
penetration shall be verified by obtaining a reflection
.'n similar material while usir.g approximately the same length 1
of sound travel, f
7.h.5 Coverace l
The veld shall be examined by moving the search unit pro -
gressively along and across a sufficient contact area so 4
as to scan the entire veld volume.
j 75 Transfer 14echanista 1
751 Transfer correction shall be one (0 db) when the basic calibration block is judged to be similar in surface condition to the material under test.
7 5 1.1 Suei variables as contince, reale, roughness, :.nd curuture shall be considered in evaluating the above similarity.
i NUCLEAR SERVICES CORPORATION
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SPECIAL PROCESS STANDARD
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- 7. !i.2 Where there is dissimilarity between the calibration block and the material under test and the transfer mechanism is applied it shall be detailed on the technique sheet.
8.0 INDICATIONS All indications which produce a response greater than 100 per cent of the reference IcVel shall be investigated to the extent that the examiner can determine the shape, identity, and locate all such reflectors and evaluate them in terns of the acceptance standards. Oscillograph chart records of indication explitude and rance may be used as an aid in comparison of the indication response with that of the primary reference reflector.
90 EVALUATION _OF INDICATIONS The anr.le of the flav to the curface, dispercion characteristice of the metal which change the echo strength vith centh, and the effect of surface curvature and narrow inspection faces shall be concidered in estimatine, flav site. Under certain conditions, non-standard reference blocks and/or special techniques vill be used to deterrine the exact character of the actual defect.
10.0 ACCEPTANCE STANDARDS 10.1 The following chall conctitute the minimum requirements for veldc:
Linear type discontinuities are unacceptable if the amplitude exceeds the reference level and discontinuities have lengths which exceed the following:
1/h in.for t up to 3/h in. inclusive.
1/3 in.for t over 3/h in. to 2-1/h in, inclusive, and 3/h in.for t over 2-1/h in.
Where t is the thickness of the thinner portion of the veld beine; examined. Where discontinuities are interpreted to be cracks, it.ek of fusion, and incomplete penetration, they are unacceptable rest.rd-less of discontinuity length or signal amplitude.
l 11.0 REPORTS _
11.1 Report of Ultraconic Examination The specific technique for each examination shall be recorded on form NSC-TS-003-6/7h and shall include the following trinimum information (cee attached form) which vill be developed from information obtained when inspecting the firct unit.
NUCLEAR SERVICES CORPORATION
l SPECIAL PROCESS STANDARD
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10 or 17 11.0 (continued) a)
Veld type and configuration, part or piece number to be tested, including thickness and diameter dinesions.
b)
Automatic defect alarm and recording equipment or both, if used.
e c)
Special search unit, vedges, shoes, or saddles, if used.
d)
Scanning mechanisms, if used, e)
Stage of manufacture when test was made.
f)
The surface or surfaces from which the test was performed.
g)
Surface finish, h)
Couplant.
i)
Method (s) used.
j)
Description of the calibration method (s) and method of correlating indications with defects.
k)
Scanning method (s).
1)
Types and sizeb of transducers.
m)
Test frequency.
n)
Calibration checks before and after each examination.
11.2 Nuclear Services Corporation Cert.ification Form NSC-TS-093-6/Th shall be filled out completely by qualified perconnel and the report shall be signed by Nuclear Services Corporation certified inspector. When requested, all rejectable indications vill be shown on a drawing or chart of the item and an inspection techni-que sheet chall be provided. Two ecpies of the certification form (s) shall be retained by Nuclear Services Corporation and three copies shall be given to the client.
11.3 Applicable oscillograph strip chart records of the examination generated according to Nucletr Services Corporation Procedure NUT-NC-3 chall be attached to the report.
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SPECIAL PROCESS STANDARD 11 or 17 12.0 QUALITY ASSURANCE 12.1 It shall be the responsibility of the Nucicar Services Corporation Level III Examiner to enforce the requirements of thic procedure.
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LOCATION OF HOLE F ROM
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CONTACT $URFACE DETERMINED FROM THE TABLE BELOW basic CALIBRAT10N HOLE OF DIAMETER *de SIDES PARALLEL T
WITHIN 0.015 IN./ FT W
L = Length of block determined by the angle of search unit and the vee path used T
- Theckness et basic cal bration block late table belowl i
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- Depth of sidedrilled ho't (see table below)
- Diameter of sitte drilled hole (see table below) t
- Nominal production material thickness 1
1 Nominat Prodse son Besie Calibration Hola Hole Minimum Hole a
Materiel Thickness (t) in.
Block Thickness IT). in.
Location Diameter (dl,in.
Depth (18),6n.
Up to I in61 84 ort
'A T 8/3, l ' /s Oser i thru 2 l'4 ori
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'4 l'4 O=ct 2 thru 4 3 or t
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Over 6 thru 8 7 or t
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Over 10 t
'4 T See Note i l'4 Note i f or cJ6 h ancreaw in this kness of 2 in. or a tras hon thereof, tiie hole diameter sh,it) inercase 'fi. in,.
%Ie 2 1 or blot k si.es oser 3 in, in thiskness tII, the dhtame Ironi the hole to the end of the block shall bc 'al' intn. In psevent miniklent rencething finni Ilw hole and the cornet in the '/. th vec path position. filods fabricated i
willi a Itein, minimum diniennon need nne be inoilifwd if the tornce azul hole indications ran be cauty risohed.
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