ML19350E499
| ML19350E499 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/15/1981 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19350E498 | List: |
| References | |
| SRG-78-01, SRG-78-01-R02-V02, SRG-78-1, SRG-78-1-R2-V2, NUDOCS 8106230182 | |
| Download: ML19350E499 (114) | |
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A.I-l Appendix I - Procedures and Calibration Standards ISI-120 Ur Examination of Piping Welds A.I-2-A.1-22 ISI-125 Ur Examination for Stress Corrosion Cracking A. I-2 3-A.1-39 ISI-240 Penetrant Examination of Uelds A.I-40-A.1-47 Calibration Block 50209 Drawing A.I-48 Calibration Block 50209 Certification . .
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!NSERYlCE INSPECT!CN PROCEDtJRE
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SU BJ ECT ULTRASCNIC EXAMINATICN OF CU.55 152 PIPING WELDS JOINING SIMIIAR & DISS*MILAR ,,S,2-120, l
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- 1. SCOPE: This examination procedure shall govern the ultrasonic examination of similar and dissimilar =etal Class 1&2 piping welds ranging .in thickness frc= 0.1 to 6 inches. Circumferential, icngitudinal, attachment, hanger, support,neccle, etc. weld sea =s in piping are covered by this p ccedure. This precedure is in accc: dance with the recuirements of Section XI of the ASME Ccde.
- 2. SCRFACE PREPARATION: The examination surface shall be free of '
d '.rt , 1cese scale, =achining or grinding particles, weld splatter,
, c: other icose fcreign material. Surface preparation shall be performed en an area which includes the weld and the area for two ti=es the thickness en both sides of the weld.
- 3. OPERATOR QUALIFICATIONS:
3.1 c=erator: The operator perfc =ing the examination shall be qualafied to Level I! in accc: dance with B&W Construction Cc=pany Quality Cont:cl Ad=inis_rative P ccedure 9A-159.
The Level II shall be responsible for and shall accept the results of the examination.
"} 3.2 Assistant: The assistant shall be cualified to at least Level I in acccrdance with S&W Ccnstruction Cc=pany Quality cont:cl Administrative Precedure 9A-159. The Level I sha'.1 not inde-pendently evaluate er accept the results of the examinatien.
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4.1 UT Sec :e: A pulse-echo type ultrasonic flaw detection instru-
=ent snall be used. The instru=ent shall be equipped with a stepped gain centrol calibrated in units of 2d3 cr less.
4.2 Search Units: .
, 4.2.1 Straicht Beam: Either ceramic, lithium sulf ate er bariun titanate 2.25 .W e single element er a 2.25 c 5. 0 .w:
dual element search uniti shall be used. The element shall have an effective area f:c= .049 to 1.0 square inches inclusive. If grain structure is such that 2.25 MH: Oannot penetrate, a 1.0 MHc search unit of the types listed above =ay be used. Other search units may be used upon approval cf the 3&W Construction Cc=pany Level
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4.2.2 Ancle sea =: Either ceramic, lithium sulfate or barium REVISEc SY REVISICN P AGE Nc.
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1 BA?,CCIX & WILCOX A.I-3 res 3te::'
S&W Construction Commeny INSERVICE INSFECTION PROCEDURE SUBJECT ULTEASONIC EXAM ~ NATION OF CLASS 1 & 2 l
(~-t PI?!NG-WILDS JOINING S*MILAR & DISSIMILA1: I_2I-120, REv. fi-v v.:. 3_ . - -
titanate 2.75 MHe, 45 degree (-2 degrees) angle beam single element search unit shall be used. The element i
shall have an effective area f:cm .049 to 1.0 square inches inclusive. Other angles =ay be used to evaluate indications, or where wa " + ess er gec=etric cen-i
!- figuratien i= pedes the effective use of 45 degree angle beam for examination. If grain structure is such that 2.25 MEc cannot penetrate, a 1.0 MHc search unit =ay be
.i used. Cther search units may be used upon approval of the B&W Construction Cc=pany Level III.
4.2.2.1 Ixit ?cint: A standard steel IIW bicek will be used cefc e' examinations are perfc =ed each day to verify or correct the exit point on the transducer shoe.
4.2.2.2 Seam Ancle: After the exit point has been i
determined, t'. angle shall be checked with the
. IIW bicek to confirm that the transducer meets angle ranges specified in 4.2.2.
4.2 Cou=lant: A suitable liquid, semi-liquid, er paste ccuplant O. medium, such as water, cil, gylcerin,. grease er Hamikleer shall be applied to the examination surface.
I j 5. CALIERATICN BICCK:
5.1 Mater 5.al: The bicek shall be fabricated frc= a cc=penent pro-longa:Lon where possible. If it is not possible to fabricate
' the block frc= =aterial taken f:c= the ce=penent, it shall be i
fabricated frc= a material similar to the cc=ponent. When the i
examinatica is to be perfer=ed frc= cnly one side of the joint, the calibration block shall be of the same =aterial as where
{ the search unit is applied.
t . . . .
- .2 Sice: The length cf the. cali'cration'. block shall 5.,e.. --
i decer=ined by the angle of the search unit and the Vee path that will be used. A minimum length of 60 is desirable. ,
! 5.2.1 Thickness:
I 5.2.1.1 Prior to the W'75 Code:1 The thickness of the biccx shall..ce as allowed in Figure 1 for the material thickness exz=ined. Where two er more i
j .cc=ponent thicknesses are joined, the block
- shall be selected to cover the largest thickness. ,
4 s
'O Winter 1975 Ccde Addenda te Section XI, thrcucheut this ::ccedure.
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ess 32 3:' 'A.I-4 BABCOCK & WILCOX S&W Construction Company INSdRVICE INSFECTION PROCEDURE f .. '
SU BJ EcT ULTRASONIC EXAICNATION OF CLASS 1 &_2, v
P PING WE1DS JOINING SIMILAR & DISSIMILAR g g IS. A- 120 t.EV . 6'.
5.2.1.2 W'75 Code and Later: The. thickness of the
~ block shall be -Jie same nominal dimension as the pipe being exa ined. Where two or more c=mponent thicknesses are joined, the block shall be selected to cover the thick-ness where the search unit is applied.
5.3 Calibration sleck-Reflectors: .. .
5.3.1 Holes
5.3.1.1 Prior to the W'75 Cede: The calibration holes, snall me d: 11ed parallel to the centact sur-face for flat blocks. For curved blocks, longitudinal holes shall be drilled para,llel to the contact surface and circumferential 4
holes, when used, shall be drilled parallel to a tangent to the con'.act surface. The diameter and depth of these holes shall cen-form to these stated in Figure 1 for the j 'g block thickness.
5.3.1.2 W'75 Code and Later: Side drilled holes may
.be placed in tne calibration block at 1/4
! and 3/4 T with a depth of 1-1/2 inch minimum.
The holes shall be located so they will not d ~= "a e with the notches.
Ecle- diameters shall be as stated in Table III f=r .the block thickness.
2
~'.3.2 5 Notches: . . _ _ . .
t 5.3.2.1 Prior to the W'75 Code: The calibration doesn't require :ne use of notches.
bicek. .
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5.3.2.2 W'75 Cede and Later: The calibration bicek ..
shall contain ID and CD circu=farential and longitudinal notches with their sides per-pendicular to the surface. The notches shall.
have a length cf 1.0 inch minimum, a width no '
_ greater than 1/4 inch and a depth as shewn in Table II fc Ferritic and Austenitic materials.
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PAGE NC.
3 or 21
res 31:32a' EABCOCK L WILCOX B&W Construction Company INSERYlCE INSPECTION PROCEDURE-
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5.4 Confieuratien
5.4.1 Prior te the W'75 Ccde:
5.4.1.1 Flat 31cek: For the examination of circum-ferentaal or longitudinal welds en piping with contact curvatures greater than 20 inch diameter, a flat bicek er blocks of essentially the same curvature as the par:-to be ' examined nav. be used.
5.4.1.2 Cuned 31ceks: Fcr examination of circu=- _.
ferentaal or 1cngitudinal welds en piping with contact curvature: ecual to er less than 20 inch diameter, a curved bicek shall be used.
A single curved beric calibratien bicek =ay be used := calibr,ae for centact surfaces in the curvature rar;<1 frc= 9/10 to 1-1/2 times the calibration 51cck diameter.
.5.4.2 W'75 Ccde and Later: The ca W *'en bicek shall be of
- ..e same nc=:.nal d:.ameter as the component being ex-
. amined.
5.5 Sicek Te=;erature:
5.5.1 'W'75 Code and Later: The temperature of the calibration ..
block and One cc=:enen: shall be within 25 degrees F (14 degrees C) of each other.
- 6. CAL 3RATICN:
6.1 Straicht 3eam fer Laminar Defects: . . . . . . . _ . _ . ...
6.1.1 Prior te the W'75 Ccde: Examination of the base ~
metal snall ce perfer=ed en the cc=penent for the detectica of laminar type discontinuities that may .
interfere with the angle beam examination.
6.1.2 N'75 Ccde and Later: If the compenent has pre'vicusly rece:.vec a la=:.nar type examination, the laminar examination does =ct apply.
'6.1. 3 - Rance : The sweep range calibratica shall be perfor=ed using an : W block cr the calibration bicek. The r*,4 v
maxi =um thickness should a.c.cear at ne grea:er than 80%
of the full screen sweep.
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's: 32:32' SABCCCX & WILCOX B&W Construction Company INSERYlCE INSPECTION PROCEDURE
(' '! su aJECT CLTRA'iCNIC EX'nMINATICN C.' CLASS 1 & 2 PIPING FTEEDS JOINING SIMIIJ.R & DISSIMILAR ~
MATERIALS ISI-120, REV. 6 6.1.4 Back Wall Amplitude Calibraticn: The' search shall be coupled to tne exam:.nacion material to produce a minimum 50% to a maxi =um 75% full screen back reflection from the opposite side.of a defect free area of the part to be examined.
If calibration frem the oppsite side of the cc=ptnent-is not possible or unreliable, calibration sha.u be established u::ing the calibration block. The cali-
- bration block back reflection shall be set at a minimum of 50% and maxi =um 75%.
l 6.2 Straicht Beam for Area of Interest: . .
6.2.1 Prior to the W'75 Code: Examinatien of the Area of Interest w.t:n a scrarght beam shall be performed.
6.2.2 W'75 Code and Later: The straighu beam examination of I
the Area of Interesu does not apply.
'r g 6.2.3 Range: The sweep range calibratien may be performed using a IIW block er the calibration bicek itself. The back reflection of the part to be examined should appear.
on the screen at no greater than 80% of the full screen sweep.
6.2.4 Distance->_T.plitude Correction: _ . .
6.2.4.1 Position the transducer for the maximum respense -
frem the hele which gives the highest amplicude.
Adjust the sensitivity centrcl to previde an sci of full screen indication frem the hole. Mark the peak of the indicatien on the screen.
6.2.4.2 Positien the search unit for maximum respense frem each of the remaining holes and mark the peak of each on the sc een.
i 6.2.4.3 Connect the screen marks and extend through the t
thickness to provide the distance-e.mplitude curve. If only cne hele is available, this is the primary reference level for the thickness range.
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B&W Construction Comoony n INSERYlCE INSPECTION ?ROCEDURE sueJEC
- 2. Q ULTRASCNIC EXAMI'tTCION OF CLASS 1 & 2
- P I,P,,
.m..,ING..W.ILDS JCINING SIMILAR & DISSIMILAR- ,.
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s- 6.3 Ane - t: Q ibration: '
6 3.1- Rance: 'Che sweep range calibration shall be performed-
- using-an I!W Bicek, or the calibration Block. The sweep range should be set to cover the range of thickness te be examined. The maxi =um thickness should appear at -
no greater than 80% of full screen sweep.
6.3.2 Distance-Amelitude Correction Prior to the W'75 Code:
Normally tne reject centrol snall be 2.n.:ne off position:
but due to the grain beundcry noise, it =ay be necessary to use reject to cbtain a screen presentaticn with the maximum signal to ncise ratio.
6.3.2.1 Pcsition the search unit for =aximu= response f cm the hele which gives the highest amplitude.
Adjust the sensitivity control := p cvide an 80% of full screen signal f:cm that hole with the reject centrol in the off position. Mark the peak of the signal on the screen.
If necessary, increase the reject c
6.3.2.1.1 cent:cl. A signal to noise ratic of 10 to 1 or better is preferable, but a signal to ncise ratio as low as 4 to 1 is acceptable. Record the drop in signal, as a percentage of full screen, in a note on the calibration sheet. Recheck the range and make any fine adjustments.
Re positien the search unit to ob-tain the highest respense and'in-crease the sensitivity control until the signal is at 30% of full screen height. Mark the peak of the signal on the screen.
- 6.3.2.2 Pesition the search unit for max bum response from each of the remaining holes and mark the peak of each en the screen.
6.3.2.3 Connect the screen = arks and extend through the thickness to be examined.
.... - .. 6.3.3 Distance-Amelitude Correction, W'75 Code and Later:
Q Pos.::.cn ene searen un:: for max:. mum response :c= ~ ~' -
the ID notch.
P AGE No.
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1 m 328:25 I BABCCCN & WILCOX A.I-8 B&W Construction Cornpeny INSERVICE INSPECTION PROCEDURE e] sueJgc- U* TRASCNIC IXA>i! NATION OF CLASS 1& 2 ~
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PIPING WILDS JOINING SIMILAR & DISSIMILAR tiATERIALS ISI-120, RIV . 6 Adjust the amplitude to 80% full screen height and mark its peak on the screen. Without changing the inser:=ec-controls, and 1-1/2V path and = ark theirfrc=
obtain a reflection peakthe on IVthe(CD screen.notch)
Connect these points to for= a distance-amplitude curve (DAC). This curve is the pri=ary reference level. If the 1-1/2 vee path notch cannet be chtained, extrapolate the curve to the nearest 1/4T.
6.3.3.1 When the IV path notch calibration technique t as outlined in 6.3.3 cannet be performed, the examination shall be done using the 1/2 Vee path technique.
Calibration shall be acec=plished using side drilled hgles to construct the DAC curve only.
Af ter the curve has been constructed, positien the search unit so it reflects the ID notch, adjust its a=plitude to the DAC curve. This is the pri=ary reference level.
I j 6.4 With the aheve-mentioned techniques, sc=e variables may be
~ encountered; variables such as weld preparation, weld crown width, etc.
These variables may be eliminated by:
- 1. Reducing the dimension of the wedge-edge to beam exit point.
- 2. Reducing search unit sice.
- 3. Increasing beam angle.
6.5 Calibration confirmation: Sweee range and. DAC__c_.u_r_v..e. shal..l.. be .
verified:
A. At the beginning of each day of examination.
- 3. At least every four hours of examinatien.
C. With every change of examination personnel.
D. At the finish of examinations for each thickness range.
I.
F.
If the cperator suspects any malfunction of the UT system.
i After change in search units, shoes, couplants, cables, i
' ultrascnic instru=ents, or any other parts of the examination system.
G. In the event of any pcwer loss.
,, PAGE Nc.
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- A I_9 B&W Construerion Commony INSERYlCE INSPECTION PROCEDURE
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P*?ING u:.T3ASCNIC xxxMIxATICN or C Ass 1 WILDS JOINING SIMII.AR & DISSIMII.AR 2
73,_330, PSV. 6
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- - s The criginal and final calibra:ica must be perfer=ed on the basic calibration block. Inter =ediate calibratien checks a.ay be performed en a calibration bicek simulater. If a calibration block simulator is used, it shall be able to produce kncwn a=plitude and sweep readings. The si:alator-produced a=plitude and sweep reading shall be recorded on the calibratics sheet at initial calibration and each celi-bration check. If multiple DAC curves are used for different types of ex in ations, the calibration bicek simulator shall-be used for each tv..oe.
c.^ 6.6 Calibration Chances: If any point en the distance-a=plicude correct:.cn (CAC) curve has changed by =cre than 20% of its a=plitude er 10% en the sweep rancie, all data sheets since
. the previously successful calibracion check shall be marked void. A new calibration shall be made and recorded and the void exa=ination area shall be reex=~4ned. -
- 7. SCA'4NING REOUIRE.vINTS : . _ _ _ . .
7.1 Sase Metal outside the A ea of Interest: This area shall
- g, incluce all :ne base =etal en:cugn wn ch the angle bea=(s) will pass. Fc: example, when examining with a 45 degree angle beam with a 1/2 Vee path calibra:icn, the typical extent of scanning is IT added to each side of the area cf interest. The. extent of a 60 degree, 1/2 Vee path scan should be l.8T added to each side of the area cf interest.
7.2 Area'cf Interest: The Area of Interest is the volu=e to be exa=:.ned anc shall include tne weld, any weld metal previcusly applied to either side of the weld, and the base
=etal in both directicas for a distance of one wall thick-ness for Codes pric: to Winter 1975; er the base metal in both directions fer a distance of 1/2 wall thickness er one inch whichever is the lesser for Winter 1975 and later codes.
7.2.1 Aeplicatien
7.2.1.1 Prior to the W '75 Code: The Area of Interest snall be examined by a straight beam and frc=
four directions by cne angle bea=, Direct the angle 11a= normal to the weld frc= bcth i sides, and parallel to the weld in both direc- I tiens. The beams shall pass threugP all of the weld =aterial en each of the .,c.ns where practicable. ,
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PS3 ]2832A BABCOCX & WILCCX .
A.I-10 B&W Construction Company
!NSERVICE INSPECTION FRC~EDURE
[~j sueJECT
- . ULIRASCNIC EXAMINATICU OF CLASS 1 & 2 PIPING MA" TRIALS WE*DS JOINING SIMILAR & DISSIMILAR ..
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- 6 For no:cle welds, the beam shall be directed
- no=al to the veld and 45 degrees to the longit;dinal axis of the weld.
7.2.1.2 W'75 Code and Later:
The Area of Interes:
shall be exam:nec frc= two directions with a full Vee path or four directions with a 1/2 Vee path calibration. Direct the angle beam nc=al to .he veld frc= cne side and parallel to the weld in one directicn with a full Vee path calibration. :ith a 1/2 Vee path calibration, direct the angle bea=
no=al to the weld frc= both . sides and parallel to the weld in two directions.
7.2.2 For icngitudinal welds adjacent to circu=fernntial welds examined during inservice inspections, the area of interest on the icngitudinal weld shall include the
' n_
full 12-inch space between the laycut marks closest to
~/ the circumferential weld, plus any shcrter section of the laycut ending en the circumferential weld.
7.3 Movement Rate:
exceec 6 :.n./sec., The unless rate of search calibrationunit =cvement is verified shall at not rdng speed. scan-7.4 Search Unit Ccverace: -
Each . mass of the search uni overlap a m:.n.=um of 10% of the ::ansducer active.t. shall. --
dimension perpendicular to the direction of scan. element 7.5 Scannine Sensitivitv: Scanning shall be perfc=ed after in-creasing ene ga:.n a minimum of 6 d3 above the refeience level.~~
Six d3 would increase the signal amplitude by a facts: ef two making the primary reference curve a 50% DAC curve.
of peak indications requires that the signal a=plitude be ad-Recc ding justed to the DAC curve using the d3 control. True signal amplitude the cbserved shall be ebtained change in the d3 f cm the follcwing chart using centrol.
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- 3"W - SABCCCK & WILCOX B&W Constnietion Campany A.I-11 INSERVICE INSPECTION PROCEDURE e ~.
L. j SU EJ ECT U*TRASONIC EXAM.INATICN OF CI. ASS 1 & 2 2.-p
- . NG Wr.' .u DS JOIN NG S W_..-' .. t.R & D'.c.S"..LAR v3 -ve r s , e
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8.1 Definitiens -
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8.1.1 Da=es en Surface with screen correlation: The terminology used here is to cescribe the Rind of dampable indication, on the surdace, wnese location on the screen presentation is at the 8/8 node location. This is the only type of da=pable in-dication that does not require T. W. D. infermacien.
8.1.2 Da==s en Surface with no Screen Ccrrelaticn: This refers to an indica en una camps on ene surface, but whose screen presentatien displays it at a location other than the S/8 nede location. The peint at which the infica:ica da=ps should be recorded, but the indication should be treated as an indication that dces not damp. (See Figure 5) 8.1.3 Traveline Indication: An indicatica, due to its Q orienta::cn in :ne area of interest, that causes a screen presentatien in which the signal changes depth as the transducer =cves over the dimensions of
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He advised that this type of indication may be the result of the configuration of the examination area.
The examiner should use discretien and evaluau the e c s a,. 4.w. 4 ., 4 .y c e ..u._4
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cases where it dces exist, the conditien shculd be stated in a note.
8.1.4 One - Deeth Indicaticn: A single depth indication ~~ ~
does no tr: vel in cepth and maintains a censian:
depth throughout the area of interest. When
. charactericing 360C intt =ittent, 3600 centinuous, and seea. rate indications, the dec.th of the one-depth ,
indicarien can fluctuate. The amount of fluctuation I will depend en the thickness of part to which the transducer has been applied:
- a. For part thicknesses up to and inclusive of ene inch, the a=ount of fluctuation shall be 10%
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- b. For parts ever one inch in thickness, up to, and )
64' inclusive of ten inches, the a= cunt of fluctuatien I shall be _'. 100 cf an inch.
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" 'O U sueJECT~ ULTRASC::!C EZLJIINATION CF C'. ASS 1 & 2
. p! PING WELDS JOINING SIMILAR &
g,g gg DISSIMILAR. .,
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For part thicknesses over ten inches, the a= cunt of fluctuation is i.200" of an inch.
8.1.5 3600 Intermittent Indication:
A. 2 cne-depth indication that fluctuates above and
- - - - - - - below 50% DAC, with No limitation en the a= cunt of
. _ . _ . .. . Fluctuation, for the En re Leneth of the Weld.
3.
A traveling indication that also fluctuates above 3600 and below 50% can hr characterized as a tion.
inter =ittent indication with ene stipula-The indicatica must bc maintained en the screen signal / noise at all ratic.
times, with no less than a 2.1 The examiner may adjust the sensitivity of the instrument to ec=pensate for the changes in attenuatica cf the material and/cr the changes in the physical dimensions cf the indication length toweld.
of the locate this cendition along the O 'i . l . 6
~ 3600 Centinueus Indicatien: Any indication of a cne-cepta na:ure er a traveling depth nature, that '
fluctuates leng:n in amplitude cf the weld. above 50% DAC for the entire ' ~
8.1.7 Se=arate Indication: Any indication that does not =eet une accve cnaracteristics. An indication that dees not
! have the came depth as any cther indication. A trave'.in; indication that does no requirements of a 360 INT & travel meeting the amplitude characterized as a separate 360 CCN indica:icn shall be indicat.cn.
i When in deuht as to the characteri:ation cf a given indication, it also as a separz.te indicaticr. reccrd
.. . -. .3.2 Dase Metal outside the Area of Interest (All Ccdes) : _ . . . ...
8.2.1 Back Wall Method: All indications which exceet 50%
of tne resul:an: back reflection shall be investi-gated the maximum with the search unit in a position which produces amplitude.
8.2.1.1 If the maximum a=plitude equals er enceeds g 100% of the resultant back -a#'a- , the following shall be recorded:
1 .
~
P AGF. NO.
li cFM --
,. h_ 'J3- ~
MS 3:s32' BABCOCK & WILCOX B&Yi Constrmitn Cem;cny A*I-13 INSERYlCE INSPECTION PROCEDURE -
. susJEcr UI'"FASCNIC D"A:CNATICN OF CI. ASS 1 & 2' PI?!NG ~4ELOS JOINING SI CLAR- & DISSI.V.ILAR 1 5 .- 120, -.-ccv. 6
.vs~ e.
- r . . . P. w.6>ne A. A=olitude: The maximum height a -a percentage of the resultant back reflection. The amplitude shall be recorded to the nearest 10 percent increment.
B. Depth: 'The distance frcm the examination surface as read on the CRT.
4 C. Size: The 100 to 100% length and width ci che indication.
- D. Location: The search unit distance frc=
ne weld centerline and the nearest.re-ference point. These =easurements shall
' he taken at the point of maximum a=plitude.
8.2.2 Calibration sleek Methed: If the part gec=ecry.dces net procuce a back reflect on, evaluation shall be done to the calibration standard.
O Indications which exceed 100% of the original back
. reflection frcm the calibratica standard and cannot i be contained in a 2 inch diameter circle shall be j recorded as in Paragraph.S.2.1.1 3, C, and D. The' amplitufe shall be recerfed as. a percentage of the cali-bration standard back reflection. ,
i 8.2.3 If a base material condition exists which is reccriable, j
the angle beam exa=ination shall be. performed frem both the inside and cutside surfaces wherever possible. If
]'
the opposite side is not accessible, these areas shall be recorded on the data sheet and the inspection pre-fer=ed en a best effert basis.
8.3 Ancle er Straicht sea = (Frem CAC) Indications within Area of - --
_7,,',~,,- ,,~,,* .. (
1 ~ ~
S.3.1 All Cedes _: All i$.dicaticO Shich produce a respense greater than 20% of DAC reference level shall be investigated to the extent that the operator can determine the shape,'Aa d y, and location of all 4
such reflectors.
8.3.2 Prior to W'75 Ceder . _ _ _ . .
8.3.2.1 If the maxime= amelitude exceeds 50% of the
- ' DAC reference cal'ibratien, the fc11cwing shall
- r
-- be recorded en the data sheet: PAGE No.
12 cF 21
.i
~
O 80Ne . gy-
. _ _ . _ . _ _ . . _ , ~ . . . . . - - - --
W I res 32e32' BABCOCK & WILCCX A,y_14 B&W Construction Company INSERVICE INSPECTION PROCEDURE
" "K susascT ULTPJ.SCNIC I:G E NATION OF CLASS 1 & 2 bd PIPING hT.LDS JOININ3 SIMILAR & DISSIMILAR MATIRIALS 7
- 5 ** - 1 2 0 ' P'*"' I
- 6 A. A=clitude: Record the amplitude, to the neares: 10 percent increment, cf the maxi =um signal (Highest Peak) in the appropriate block. In the case of re-cording 360c intermittent and 360c continuous indications, it is also necessary to record the range of amplitufes and the number of peaks, over 100% DAC, as a note.
B. Decth: When recording the depth, no matter wna type of indication is involved, always record the depth at the =ax signal (Highest Peak) in the block provideu. Nete that, when recording traveling indica:icas,
. it is aise necessary te record the ranc.e of depths as a note to assist in character-icing the indication.
C. Leneth: The 100/100% length and the 50/50%
leng:n are te be recorded en each indicatics.
@) Where 3600 intermittent er 3600 centinuous indications are invleved the length re-corded shall be the ?ntire legth of the weld. When recordine straight beam in-dications, it is c'..so necessary :c recerf i
the width of the indica:icns.
D. Distance: To prcperly document the loca:ica of the :.ndication, it is necessary that the distance from surface ene er two, and distance frc= position "A" c: "3" shculd be recorded. This information should be taken frem the location of the max signal (Highest Peak).?cr traveling indications, the range of distances frem the opposite surface should also be recorded as a note.
It is not necessary te record the distancs "A" c "3" when documenting 3600 intermit-tent c'r 360c c.cntinucus indica icns.
b _ . . . . . . . _
i P AGE No.
i
- . ~ . 1
. .._ . *3 c F *" *'
.. - ~n -
r=.
Mt 3:02' BABCOCK & WILCOX -
I B&W Consnuctirn Ctmpany .A.I-15 INSERV!CE INSP;iCTION FROCEDURE sueJECT ULTRASONIC EXA*II*ATION OF CLASS 1 & 2 PIPING WELDS JOINING SIMILAR & DISSIMILAR ,e 7_y,0' trV*
- 5 MATES ALS -~
E. Thro'2ch Wall Dimensien (TWD): The TWD is measured cy em:a n:.ng the m:.nimum and maximum sweep readings (depth in ' inches) for which the indication signal reduces to 100% DAC. The TWD may not necessarily be measured in line with the highest indicated amplitude depth, nor de the minimum and maximum amplitude have to occur'cn the same scan line. The TWD is the difference between the minimum and maximum depths. An exa=ple of TWD measurements is given in Figure 4.
On separate, 360c centinucus, and 3600 intermittent indications that meet he requirement of an "I:CICATICN.TF.AT DAMPS
. ON ._ur .e U.e_r.,C.e, .n. .- . u S w.e~ r.r.. CO: r., A v.. ,
T.W.D. information is not necessary. On indicatiens 100Sr of DAC and belcw, there is no need to record T.W.D. infer =atien.
Q. ..
F. Damps: All indications should state whether cr not they damp.
- 9. REPORTING STANDARDS: . . _ . . . . . . . . ..
9.1- Pricr to W'75 Code: All indicatic: s detected in the Area of Interest wn:.ch produce signal amplitudes greater than the DAC reference calibratica curve and that have a linear dimension equal to er exceeding that given in Table I, shall be reccrded and reported individually and an evaluation made to the ac-ceptance standards involved in the original construction.
i TAsLz 1 4
Matetial Thickness Range T *.*"
(Inc..e w s) . D= ens {_cn
~4 ~" w 0 '5 3/' .hickness Ov["3/4 *ru 2-1/4 .
1/3 /'
7 -"*"
l Over 2-1/4 b
P AGa NO. ,
1 4 CF -- 11
q
-n o- :.m . < . - ..a-..--- --- = - ---..- - - -- .
.m Y!
usjn3n- A~I ~'6 SABCCCK & WILCOX B&W Construction Comoony INSERVtCE INSPECTION PROCEDURE 1(.) su BJ ECT ULTRASONIC EXAMINATION OF CLASS 1 & 2 PIP!MG WELDS JOINING SIMILAR & DISSIMILAR ISI-120, P2V. 6
- MATERIALS 9.1.1 Where' discontinuities are interpreted to be cracks or ince=plete penetration, they are unacceptable - regardless of discontinuity si:e c:
signal amplitude..
9.1.2 .If there is any doubt regarding the proper interpretation of ultrasonic indications in the Are.a of Interest, such doube =ay be resolved' by radiography.
9.2 W'75 Code and Later: All indications detected in the Area of Interest wn:.cn produce signal amplitudes greater than 100%
of the CAC reference calibration curie shall be reper ed
-individually and an evaluation made in accordance with Table Ih3-3514.2 and IW3-3514.3 of ASME Section XI, Winter '75 Addenda.
9.3 Any area where best affort inspection was performed due to configuration shall be recorded and reported.
. 10. RECORD OF EXAMINATICN P2SULTS: A copy cf the examination data 7 .] (F:l.gure 3) snall me prev;,.ded to the cust==er with the following infcr=ation:
A. Centract Nurler
- 3. Examination Persennel'by name and/cr ID nurler C. Instrument by ID nurler D. Method of Test E. Ccuplant by batch er ID nurler T. Calibration sheets G. Weld Identification and Location H. Type, Site and Frequency of Search Unit by ID nurler I. U1 :asonic Wave Mode J. Calibration Block Nurler .
K. Chart of Results L. Procedure nu~ber and revision .
M. Dates of Examination N. Examination Surface O. Layout 'of Weld Seams as Detailed in ISI- 3 60, ISI-361, ISI-362 or 3LI-36 P. The nurler's) of any Field Change Authorizatien(s) that affect (s) this procedure.
O i _ . _ . . _..
... .. . .. . 15 cF 21
. s w mee .m miig 6 8- 6N '*
- - , + , , ,-w- = - - y ,++n--
5 +~m
.w ., w _ _ _ .-_ . - . __
'80242' , SABCOCK & WILCOX .,
A.I.17 B&W Consnuetion Comoony INSERVICE INSFECTION PROCEDURE
'O .
susjscT ULT 3ASONIC ICeFliATICN OF CLASS 1 & 2 PI?ING WELOS:JCINING SIMILAR & DISSIMILAR MATERIALS. . -
ISI-120,'REV.o..
TABLE II SURFACE NOTCH DEPTHS FOR:
ULTRASONIC CALI3 RATION.
-i Nominal' Pipe Wall Notch Depth (d)
-Thickness (t) inches Materials as a rercent of t Less than 0.312 Ferritic 10. 0 + 0. 005 in./-0. 010 i:
0.312 tc 6.0 Ferritic 10.4 minus 0.9t + 104/-20 10% cf t + 10%/-20%
Less than 0.312 Austenitic 0.312 to 6.0 Austenitic 10% of t + 10%/-20%
4 TABLE IIi CALI2 RATION 3 LOC'< ECLE DI.27.: TIES Material' '"hickness (t) inches Ecle Dir. mete:- ( f.) inches ,
Up to 1 inclusive 3/32 Over 1 thru 2 1/8 over 2 thru 4 3/16 Over 4 thru 6 1/4 k
g, 16 C#21 66
- ,,. -_ ._--,v , -_m_ , . _ - , . . . .--,m , , _ , . . . . _ , . , - , . -. ,,,,w-., y _..,. -.w. -.,_w,. ,
-,.7. ,m.%,-
, 825 328324 BABCOCK & W!LCCX B&W Construction Compeny A.I-18 INSERVICE INSPECTICN PROCEDURE
/...1 su ed ECT '
7 ULTRASCNIC EXA.IINATICN CI' CLASS 1 & 2 "PIPING b '":'? 2 WILOS JOINING SIIi!LAR.,p DISSICLAR 0 Isr 120, REv. 6
.' i.
< I MIN f EE NOTE 21 I
--{ h in ,
\
l] O ^
.-.__.-_ !! l l
- 3. - __.
t L- _.
-1~_.. -
i
_ . . M/
.b 4 aY 4(LOCATICN CF HCLE FRCM .
CCNTACT SUAFACE CETERMINED
- FACM THE TABLE SELCw
- l BA3tC CAltBRAT!CN HCLg .
l CF clAuETER'C*
l !! DES PARAL!,,EL. ';"
Yf!TH:N 10.Cf5 IN./F7 i
O '
I __
IIN i
L = tensth of bieck cetermined bv'the en;te of seseen unis ane in, vee.:ath used i T = Thickness of basic cabbration block (see table bescw) .
D = Ceoth o( siae crilled hole (see table bescwi e d a Cismeier of siee<rslice hode (see table belowl e = Nominst production material thschness i
Nominal Production Basic Cs!.braden Hole Material Thickne s (t) in. . Hole Bisck Thickness (T1.in. Locanon Minimum H:te
""~~~~~~~11p o 1 inE~~~~~~ Diameier t.O. ;n.
.. Oesth 01 ws . __
Onr 1 thru 2 8/ or: 'AT Over 2 thru 4 l'4 ort 'AT '4. l'A Over 4 Ciru 6 3 or t 'A l '/.
'A T Over 6 thru 8 5 ce f
'A T '4. I'4 Ont t thru 10 7 or t
'47 '/. I '/.
Orrr lo 9 ce t
'/.T 'A. " f.
t */.
4 'A T See Note I I '/.
Note 1-For each incre:se in shi: l '/,
Lness of 2 in..or a fraction thereof, the hole diarneter shallinere:sc '4. in.
Note '-l'or telock sires cret 3 in. in thickness (D. the distance of the block shsil be %Tfanm the hole to t with a 1%.in.minimuen di nensinn need - inot osition.be rnodified if the cern g
! Diocks fabric 2ted
.. . . . . a ions cza be easily resolved.
Q _. . ~
FIGURE 1 PAGE NC.
' ~~ ~
SASIC CALI3RATICN SLCCKS 4
wwM '
w . e,w e. .e
1 e I 1
Pss 32 W BABCCCK & WILCOX A*I-19 j Bt.W Consnuction Company l INSERVICE INSFECTION PROCEDURE n
. (.)
S'JSJECT ULTRASONIC EXAMINATION OF CLASS 1 & 2 RIV.
I PIPING WELDS 'O!NING SIMILAR & DISSIMILAR ISI '.20, E
- v. s..e 2. . .. 3~. S t
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uni =au ar=. w ., u..
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c a.= == - ... ,,,;,,,, ,,,,,,,
erste m ..,,.u. ......
.c n . . ..o o e.s = ac.o.so.
. ov.. .. n i. . nnn.. nia.u.
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6 St.f t. .a..Et ,..ca s e.
e t 4
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C .p.a6 - ,s . e i s =.
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, , cau .ario. co.em.ario.
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u C ogg.ge g g4 4 4i .. # s6 i. J ' si s..a se e. J m<
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- t. Ime4A SPb4C,te. c. C b. 4.C se * .et. . .amCa .4 Pk8 0,,0. Feen .. 9B
, ouvirww. ev 6syns .ars .sv ew,
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f- A.I-20 us :2024 BABCCCX t. Wi!.CCX Bt.W Construction Company r, INSERYlCE INSPECTION PROCEDURE 1
s.) SU BJ ECT ULTRASCNIC EXAMINATION OF CLASS 1 & 2 i PIPING hE*.OS JOINING SIMIIAR & DISSIMI*AR MTERI A* S .,.3 7 _ ~3*' ,0 '
- P' r* ** 6
..........._.....-,,e,.,. . .e _ . , . .. ~. .-
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peau 104 e.e co.cocastawcrees a ==ccei come..v l6 , .
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lc o.ve.ev .a lcs seo.tnes
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- - - - - este s.s4
(*=aciousti t ea rs si.w l v-c a.e rir
.e. eositio.s. t out. . car 19trviverneur -
t e' eus tes.ca: icaws.aste tc.us. cat et o. eve etme ,Lo.e_s un t Lasetac ca
!c w s. orts C=e Orts ee'so..vs I. 462: I..c6sa ane aae . i s.hsa .
poei lLaveu ) ema sv..ri t t=e ersetj l, e se..v, t uswame lioei
} Leveu lte.astee n t eme stee, . it c svoa, s eras. i
, e.e, vene- = i .. . , v e .ee e e t e. ., er... -e,:.
.-- . seres is.rt
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1 1 I l l l l l l l i f I i l 1 ( l i t i I I i i i i i i t i I i 1 1 1. I t t t I i t I I i e I t t i i i t t . I e i t i 6 i i i t e i t i 1 i i i i i i i I e I I (
, i ) I t I i i r i I i 1 e # e i i t - i e 1 t 4. i __
t l I e e i i e
- - - - - - i i i i # .1 i ! .t l 't 'l i ) I I I f I I i i i
- - - - i I t i .L 4 l-i . I t L i t I I i ! t i ! i
- - -' i i i i t i i
.. a e.,
- 6,v.u .
= v. .. e, ._.i..t,..
FIGURE 3 TYPICAL DATA SEEET h _ . . _ . .
P AGE NO.
k~ .. . 19 CF21
..I.
, .em. .w el. "-*
- A.I-21
'as 3n32' B ABCOCK !. WILCDX St.W Construction Commeny INSERYlCE IN5?ECTION PROCEDURE r.
v./ sueJECT ULTP.ASCNIC EXAMINATICN OF CLASS 1 & 2
?I?ING WELDS JOINING SIMI A2 & DISSIMILAP. I52-120 FIV. 6 M.'.TER~ ALS .
..,.c.,.-, J Ya U .s .7 4 e l Og C
, W OIsoLu . 3 i , Og A
, i O
l u
vs.g.*.u.gy. .
A TWD' DEPTH
" I* - - =1.2.INC-? Y *dELD i
.v= - ..\* .w.*.y
. = 1
-,..3.-., k., ..
L. .) _3. el
- j
, -ve.
A L. r.. . ,l ,
e.
. , = , . * . w _
b = . Nb g
' s
- M ,. . ' d MIN ~ MUM CG -
\ .
D. : 3 . z n, . 3. C C \ ., . -uns
\ /3 s -
Dl llA =. ~~~r --~s;3. ,
_p 3 ,/jp ,.,.y s.re-<cM 's .sJ /
D... .,,
- . A. .u.a-. ,. ...
TWD DEP"'E Ns . /Y
/'s , /j 5.Gu..~- - ..v_ . u .m.wm e
- .. -1.5 INCE
} /
T s
s
[ ,. // / ~ , s.lD
- C._._. _.e -.... -
- .j/
\ , / ECCMUM TWD i /<. DEFTH AC 1001 CAC HASE v.A"'EP m ( ..
\ /
\ / BASE MA'~EP~2c. .
. . . - . . , j
?
.I
) = 3eam directicn and scan path
- - - = Angle beam path in base material and weld
- ~ = Ciren= scribed rectangle
- - - = = '"ypical indication source M = Transducer position for raximum signal amplitude S = Trant ' cer position f er minimum ""4D path D = "'r a.9 ..tr position for maximum CC path TWD = 1.8 .: - 1.2 inch = 0.6 inch h . .. . . . . . -
-,GL.
TWD EXAMp;3
.:. 4
' P AGE No.
0,C 7.0 a4 i_
'M"* =e.-6 e
.e .-
6 ..
,_T M .M... W-M 9 M ,
es as
-~
, _ _ _, ,_m-- _ . _-
c..._ .- -
's: 32:32^
BABCCCK & WILCOX S&W Construction Commony INSERVICE INSFECTICH PROCEDURE
( :
~~ sus >ECT L*LTRASONIC EY.23. ::ATION OF CLASS 1&2 1 P:
t.e
- PING
- a? T * * *WILDS C JOINING SIMILAR & DISS M ,AR
- g=
- 20r 1
- =T=V
- 6 i
e e 0 w es .i a ~
ULTRei= 3awt C.
- n o c ia r:o* 5 l
v Y v N CT
. CAMPS CAscs
' I l I 7 c ....s c. -
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- doWI' 44f cr eta es pra 8 e
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.e C Figure 5 pacg se, e 21 cF 21
_ _ eg g
. N.
- enemy een.w me h
A.I-23 BA8COCX & WILCOX
(- ess 22:32 B&W Constructi n Company INSERVICE INSPECTION PROCEDURE sumcT ULTRASONIC EXAMINATION FOR INTERGRANULAR SS STEEL OR ISI-125, REV. 0
- Tcerp,CORROSION STRES nce CRACKING v ov PTpTNG IN STAINLE
. l
- 1. SCOPE:
This examination precedure shall governalley the ultrasonic piping examination of stainless steel and nickel base The thickness range for covereddetection of procedure by this stress cerrosienis fremcracks. 0.75 to 1.35 inches.
PREPARATICN: The ex.:mination surface shall be free of
- 2. SURFACE loose scale, =achining or grinding particles, dirt, Surfaceweld' preparation ~~ ~
splatter, or other loose foreign material.shall-fbe theperformed weld. on an area area for twoa pric:
In addition, times the thickness en both sidesexamination of the been corpleted using ISI-120.
- 3. OPERATOR QUALITICATICNS:
3 .1 ' Ocerator: Thc operater performing the examinatien shall be qualified to Level II in accordance with B&W Construction Ccmpany Quality Centrol Administrative Precedure 9A-lC3.
The Level II shall be responsible for and shall accept the .
results of the exmination.
3.2 Assistant
The assistant shall be qualified to at least Level I in accordance with 3&W ConstructionThe Ccmpany Level Cuality I shall Centrol Administrative Procedure 9A-169.
not independently evaluate or accept the results of the examination.
- 4. ECU~EW.'"_ :
4.1 UT Sec=e: A pulse-techoThe typeinstrumentultrasenicshall flawbe detecticn equipped in-s :ument shall be used.
with a stepped gain centrol calibrated in units of 2d3 or ,
less.
f Search Units: A lead ::ircenats titanate, 1.5 MH:, 45 de-I 4.2 ser.rch unit gree refracted (shear) angle beam, dual element shall be used. The element shall have anOther effect.ve areaunits i
from 0.10 to 0.15 square inch inclusive. search i
may be used upcn approval of the B&W Construction Company j Level III.
4.2.1 Exit Point: A standard steel I W bicek will be used before examinations are perfor=ed each day to verify or correct the exit point on the transducer shee.
P AGE No.
REVISED BY REVISICN 1 CF 17 GAT INITIAL ISSUE ISSUE DATE
' REVISICN CATE 9-5-78 - - -ee-..
M46 h
., . ~ . .
_. _- .~
a.
ns' jan:' A.I-24 BABCCCK & WILCOX B&W Construcen Company INSERYlCE INSPECTION PROCEDURE *
- sumascT ULTRASONIC EXAMINATION FOR INTERGRANULAR STRESS CORROSICN CRACKING IN STAINLESS STEEL OR NICKEL BASE ALLOY PIPING ISI,125, REV. 0 4.2.2 Beam Angle: After the exit point has been determined, tne angle shall be checked with the IIW block to cen-firm that the transducer meets the angle specified in 4.2.
4, ~ Couplant: A suitable liquid, semi-liquid, or medium, such as water, oil, gycerin, grease, c: paste couplant Hamikleer ~
shall.be applied to the examination surface.
Each batch of materials used on stainless steels or nickel base alleys sha.'.1 '.: ave been tested for residual a= cunts of
-total halogen and total sulfur in accordance with ISI-c0.
The total residual a= cunt of halogens and sulfur shall not exceed the requirements of ISI-60. The couplant identification or batch number shall be recorded en the data sheet.
- 5. CALI3 RATION BLCCK:
5.1 Material
The bicek shall be fabricated frem a ec=ponent prolongation where possible. If it is not possible to ' ' ~
fabricate the block frem material taken from the component, it shall be fabricated frem a material similar to the ecmponent. When the examination is to be perfor=ed frem only one side of the joint, the calibratien block shall be of the same material as that where the search unit is applied.
5.2 Size: The length of the calibration bicek shall be determined by the angle of the search unit and the Vee path that will be used. A minimum length of 6T is desirable.
5.2.1 Thickness
The thickness of the block shall be the same ncm nal dimension as the pipe being examined.
Where two or more cc=penent thicknesses are joined, the block shall be selected to cover the thickness i
where the search unit is applied.
5.3 Calibration 31ock Reflectors: The calibratica block shall contain ID and CD c.rcumferential and longitudinal notches with their sides perpendicular to the surface. The notches shall have a length 1.0 inch =inimum, a width ne greater than 1/4 inch, and a depth of 5% of the total thickness.
5.4 Confieuration
5.4.1 Curved 31ceks: For examinatien of circumferential or longitudinal welds on piping, curved blecks shall be used.
( . _ .
P AGE No. l 2 or 17[
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A.I-25 "3 38 *
- SABCCCX & WILCOX B&W Conservetion Company INSERVICE INSPECTION PROCEDURE SueJECT ULTRASONIC EXA.4INATION FOR INTERGRTWULAR STRESS CORRCSICN CRACKING IN STAINLESS STEEL OR MICKEL BASE _MLOY PIPING ISI-125, REV. 0 5.4.2 The calibration bicek shall be of tha same nc=inal diameter and thickness as the ec=ponent being ex-amined.
5.5 Block Te=rerature: The te=perature of the calibration block and ne ec=ponen shall be within 25 degrees F (14 degrees C) ~ ~~
ef each other.
- 6. CALIBRATION:
6.1 Rance
The sweep range calibration in " depth" shall be performed using an IIW b3eck, er the calibratien block.
The sweep range should be set to cover the range of thicP=ess to be examinad. The =aximum thickness shculd appear at :.o greater than 80% of full screen sweep.
__.. 6.2 Primary Distance ;=clitude Correction: When ex W =ing circu=terential walds ut 11:1ng curved block, DAC curves shall be constructed frc= notches perpendicular t.c the axis of the basic calibratien block.
6.2.1 Position the angle beam search unit en the basic calibratien block to obtain maximum response frc=
the nedal position producing the highest a=plitude.
This nede will be the primary reference response.
Nodal Positions 4/8, 8/8, 12/8 6.2.2 Adjust instrument gain centrols to chtain the prima _7-reference response at 80% '5% cf full screen height (FSE) and = ark this a=plitude on the screen. The gain cen-trols shall not be adjusted ence the primary reference response has been established.
6.2.3 Position the search unit to ebtain maximum response frc= the remaining nedal positions and mark each a=plitude en the screen.
6.2.4 Join these points with a s=ceth curved line, the length of which shall extend 1/S nede beyond the last qualified calibration point.
d P AGE Nc.
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"8 38832' BABCCCX & WILCOX 4 B&W Construction Company !
INSERY!rE INSPECTION PROCEDURE ,
susJECT ULTRASCNIC EXAMINATION FOR INTERGRANULAF,
-STRESS CORROSION CRACKING IN STAINLESS STIIL ISI-125, REV. 0 OR NICKE1 BASE ALLOY PIPING 6.3 Secondarv DAC Calibrations: If any points on the DAC curve do not appear at 20% FSE or greater, a secondary DAC curve shall be constracted as follows:
6.3.1 All secondary DAC curves shall contain at least 2 points.
6.3.2 The centDAC to a DAC point point at 2 linesthat orfa15reater s below in-amplitude and adja 2 lines of amplitude shall be brought to the primary reference level by manipulating the gain controls of the instr =ent.
This point shall then be marked en the instrument screen. The adjacent point, previously at less than 2 lines of a=plitude, iall then be marked on the screen and the two po mts connected with a s=coth curved line. The instrument gain settings for this secondary DAC curve shall then be recoreded on the appropriate calibration sheet.
EXCEPTICN When the first DAC point is the only point above 2 lines of a: plitude, then the next highest point shall be brought to the primary reference level. This point shall then be marked en the instrument screen.
The adjacent point, previously at less than 2 lines of amplitude, shall then be marked en the screen and the two points connected with a smcoth curved-line.
The instru=ent gain settings for this secondary CAC curve shall then be recorded en the apprcpriate calibration sheet.
6.4 Calibration Confirmation: Sweep range and CAC curve shall be verr.fied:
- A. At the beginning of each day of examination.
- 3. At least every four hcurs of exuinatien.
C. With every change of examination personnel. i D. At the finish of examinatiens for each thickness range.
I. If the operator suspects any =alfunction of the CT system.
F. After change in search units, shoes, couplants, >
cables, ultrasonic instruments, or any other parts of the examination system. l G. In the event of any pcwer loss. J PAGE NC.
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- l INSERylCE INSPECT!ON PROCEDURE ,
susJECT ULTRASONIC EXAMINATION FOR INTERGF<AiULisR -
STRESS CORROSIGN CRACKING IN STAINLESS STEEL OR NICKEL BASE ALLOY PIPING ISI-125, REV. 0
, The original and final calibration must be performed on the basic calibration block. Intermediate calibration checks may be performed on a calibration block simulator. If a calibration block simulator is used, it shall be able to produce known amplitude and sweep readings. The simulator-produced amplitude and sweep reading shall be recorded on the calibration sheet at initial calibration and each cali-bration check.
6.5 Calibration changes: If any point on the distance-amplitude correction (DAC) curve has changed by more than 20% of its amplitude or 5% on the swee, range, all data shcets since the previcusly successful calibration check shall be marked .
void. A new calibration shall be made and recorded and the i void examination area shall be reexamined.
- 7. SCANNING REQUIPIMENTS:
I
' 7.1 Area of Interest: The area of interest is the volume to be examined and shall include the inner one-third of the material thickness for both the weld and base material in both directions for a distance of one wall thickness from the edge of the weld.
7.1.1 Application
.7.1.1.1 The area of interest shall be examined from two directions by one angle beam. Direct the angle beam normal to the weld from both sides. During scanning, the search unit will be skewed at least 45 degrees in both the clochwise and counterclockwise directions.
The beam shall pass through the inner one-
- third of the material thickness on each of the scans where practicable.
7.2 Movement Rate: The rate of search unit movement shall not exceed 6 in./sec., unless calibration is verified at scan-ning speed.
7.2 Search Unit Coverage: Each pass of the search unit shall overlap a minimum of 10% of the transducer active element dimension perpendicaular to the direction of scan.
.a
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PAGE No, So( 17
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- ss Jan:s SABCCCX & wtLCOX B&W Construction Company A.I-28 INSERYlCE INSPECT;0N PROCEDURE i
susJECT ULTRASONIC E'.G.MINATICN FOR INTERGRANT,LAR ST"~;SS CORRCSION CRACKING IN STAINLESS STEE~,ISI-125. REv. 0
_cr Nicvit BAsr .s troy Pr?! MO ___
Scannine sensitivity: Scanning shall be performed after in-7.4 creas!ng tne ga:.n a minimum of 6d3 abcve the reference level. Six d3 would increase the signal amplitude by aprim f actor ofRecording two ::akingofthe curve. peak indications recuires that the signal amplitude be adjusted to the DAC curve using the d3 control.
True signal amplitude shall be obtained 2:cm the following chart using the observed change in the d3 control. .
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. Thickness measurements shall be 7.5 Thickness Measurements:a =:.n. mum of three points on the centerline of taken at in the base material on either the weld and at ene pointMeasurements shall be taken using side of the weld. search unit on the ap-ISI-120 by placing the o degree These propriate position on the examination surface. measu sheet (see Figure 3) .
Centeur of the weld to be examined shall be taken ih by utilizing d
.s contour gage or by measuring the weld crown's he g t an vidth.
- 8. RECORDIMG STAND ARDS :
8.1 Definitions _: The 8.1.1 Dames on Surface with Screen Correlatien: ne kin d cf ters:nology usec here .s to cescr.te dampable indication, on the surface, whose location
- en the screen presentation is au the 9/8 nedeThis i locatien. IWD information.
that does not require j
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css ;2 38' BA8CCCX & WILCOX AoI-29 B&W Construction Comeany INSERYlCE INSPECTION PROCEDURE Su sJ ECT ULTRASONIC EXAMINATION FOR INTERGRANULAR STRESS CORROSION CRACKING IN STAINLISS STIEL
_,O]L"ICKEL BASE ALLOY PIPING ISI-125, Ev. 0 .
. 8.1:. 2 Dames on Surface with No Screen Correlatic_n: This refers to an indication enat damps on ene surface, but whose screen presentation displays it at a location other than the 8/8 node location. The point at which the indication damps should be re-corded, but the indication should be treated as an indicatien that does not damp. (See Figure 5.)
8.1.3 Traveline Indication: An indication, due to its _ _ .
orientation in the area of interest, that causes ,
a screen presentation in which the signal changes
- depth as the transducer moves on
- the dirsnsions of
- the indicaticn shall be called a traveling indicatien.
3e advised that this type of indication may be the result of the configuration of the examination area.
The examiner should use discretien and evaluat: the possibility of this type of conditien existing In cases where it does exist, the ccndition shouic he stated in a note.
, 8.1.4 One - Deeth Indication: A single depth indication does not travel in depth and maintains a constant depth throughout the area of interest. When characterizing 3600 intermittent, 3600 continucus, and separate indications, the depth of the one-depth indication can fluctuate. The a= cunt of fluctuation will depend en the thickness of the part te which the transducer has been applied:
- a. For part thicknesses up to and inclusive of one
. inch, the amount of fluctuation shall be '10% ~ ~
of the pa *
- ekness.
- b. For parts over one inch in thickness, up te and inclusive of ten inches, the a= cunt of fluctuation shall be +.100 of an inch.
- c. Fcr part thicknesses over ten inches, the a= cunt of fluctuation is '.200 -
of an inch.
i 1.1.5 360 0 Intermittent Indicatien: .
A. A cne-depth indication that fluctuates above and belcw 50% DAC, with no limitation en the amount of fluctuation, for the ent:.re lencth of the weld.
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P AGE No.
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'55 38832' 8ASCCCX & W:LCOX B&W Conservction Company INSERVICE INSPECTION PROCEDURE susJECT ULTRASONIC EXAMINATION FOR INTERGRANULAR STRESS CORROSION CRACKING IN STAINLESS STEEL OR NICIIL BASE- ALLOY PIPING ISI-125, R *V. 0
- 3. A traveling indication that also fluctuates above and below 50% can be characteri=ed as a 3600 intermittent i.dication . with one stipula-tien. The indication must be maintained on the screen at all times, with no less than a 2.1
. signal / noise ratio. The examiner may adjust the sensitivity of the instrument to compensate for the changes in attenuation of the material and/cr the changes in the physical dimensions of the indication to locate this condition along the length of the weld.
3600 Continuous Indication: Any indication of a ene-8.1.6 depen nature or a travelt ng depth nature, that
8.1.7 Separate Indication: Any indication that does not _
4 mee: the above enaracteristics. An indication that does not have the same depth as any other indication.
A traveling indicatien that does not travel =eeting the a=plitude requirements of a 360 intermittent and 360 centinuous indicatien shall be characteri:ed as a separate indicatica. When in doubt as to the characteri:ation of a given indication, record it also as a separate indication.
8.2 Angle Beam (Frem DAC) Indications within Area of Interest:
1 8.2.1 All codes: All indications which produce a response greater than 20% of DAC reference level shall be investigated to the extent that the operater can deter =ine the shape, identity, and location of all such reflectors.
8.2.2 If the =aximum amplitude exceeds 50% of the DAC re-ference calibration, the follcwing shall bc ::cerded i on the data sheet:
t N I A. A=plitude: Record the ampittude, to the nearest 10 percent increment, of the max 1==2 signal
. (Highest Peak) in the appr=priate block. In j the case of recording 3600 intermittent and 3600 j
continuous indicaticas, it is also necessary te i record the range of a:plitudes and the number of I peaks, over 100% DAC, as a note.
P AGE Nc. i l
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.. . . t A.T-31 48 38'38' BABCCCX & W!LCCX B&W Cenem,cion Canaeny INSERYlCE INSPECTION PROCEDURE ' '
i i
susJECT ULTRASONIC EXAMINATION FOR INTERGRANULAR STRESS CORRCSICN CRACKING IN STAINLE35 STEEL OR NICKEL BASE ALLOY PIPING ISI-125, REV. 0
- 3. Depth: When recording the depth, no matter What type of indication is involved, always record the depth at the max signal (Highest Peak) in the block provided. . Note that, when recording traveling indications, it is also necessary to record the range of depths as a note to assist in characterizing the indication.
C. Leneth: The 100/100% length and the 50/50%
length are to be recorded on each indication.
Where 360 inte ittent or 3600 continuous in-dications are involved, the length recorded shall be the entire length of the weld. . When recording straight beam indications, it is also necessary to record the width of the indications.
D. Distance: To preperly docu=ent the location of the :ndication, it is necessary that the distance from surface one or two, and distance from positien "A" or "S" should be recorded. This information should be taken from the location of the =ax signal (Eighest Peak). For traveling indications, the range of distances from the opposite surface t
should also be recorded as a note. It is not necessary to record the distance "A" er "3"
( when documenting 360C intermittsnt or 3600 con-tinuous indications.
. E. Throuch Wall Dimension ('"WD) : The TWD is measured by ontaining the man =um and =aximum sweep readings (depth in inches) for which the indication signal reduces to 50% DAC. The 7dD may not neces-sarily be =easured in line with the highest in-dicated a=plitude depth, nor do the minimum and maxi =um amplitude have to occur on the same scan i
line. The TWD is the difference between the
' mini =cm and =aximum depths. An examp,le of TWD
=easure=ents is given in Figure 4.
Cn separate, 3600 continuous, and 3600 intermit-tent indications that meet the requirement of an "INDICATICN THAT DAMPS ON THE SURFACE WITH SCREEN CORRELATICN," ,74D information is not necessary.
F. Dames: ' ' a=p.
. ' indications shculd state whether or not the; t
P AGE No.
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's 32832' A.I-32 BABCCCK & WILCCX B&W Construction Company INSERYlCE INSPECTION PRCCEDURE SueJECT ULTRASONIC EXAMINATION FOR INTERGRANULAR
- STRESS CORROSION CRACKING IN STAINLESS STEEL OR NICKEL BASE ALLOY PIPING ISI-125, REV. 0
~
- 9. ANALYSIS: .
9.1 All indications detected in the area of interest shall be plotted to determine if they are root gec=etry or non-geo=etric indications.
9.2 Using the =easured thickness, draw the cross section of the pipe through the weld on graph paper.
9.2.1 Use the profile gage to provide the weld c cwn geometry.
9.3 Using drafting equip =ent and the data recorded per Para-graph,8.0, plot the physical dimensions and corresponding
=etal depths on the cross-sectional view.
NOTE More than ene indication =ay be plotted on a single cross-
~
sectional view. Figure A is an example of how a single indication would lack.
- Min. ST fs Max.
Max. nt
/% . . _ _
~
t Figure A 9.4 Resolve all recorded indications by utilizing graphic plocs as described above.
9.4.1 Resolution shall be divided into two basic categories as defined below.
- a. Root gec=etry - Metal depths which terminate on
- the far side of the we'd centerline shall be defined as root gec=etry unless they coincide with indications plotted on that side of the weld.
Figure 3 is an example of an indication defined as rcot gec=ec_7 PAGE NO.
10 er17 b - -H= m m 4
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A.I-33 m 3 s) a BABCCCX & WILCOX B&W Construction Company
^
INSERY!CE INSPEC.*t0N PROCEDURE SUSJECT ULIRASCNIC EXAMINATION FOR INTERGRANULAF .
STRESS CORROSION CRACKING IN STA'.NLESS STIEL *..
OR NICKIL BASE ALLOY PIPING f ISI-125, REV. O E
, Max .,
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. . - - . . . . . . . . . 7 A . . - -
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Figure 3
- b. Ncn-Gec=etric indicatiens - Metal depths which terminate within 1-1.25" of the centerline shall be identified as non-gec=etric indications, i.e.
crack, lack of penetratien, lack of fusion, slag, er pc csity The exact resciutien (definition) along with the Through Wall Dimension physical measure =ents and length shall be recorded as per Paragraph 9.4 The resslution (definition) cf each indication shall be based upon where the metal depth te~dnates and en its recorded charac-teristics, i.e. =id-wall en the fusien line would be defined as lack of fusien. Figure C is an exa=ple of an indication that would be defined as a-crack.
Min. 74D
. Max.
g -Max. TWD m I I b
~ l. _
Y I Figure C 9.5 Where discontinuities are interpreted to be cracks c inec=-
plate penetration, they are unacceptable regardless of discentinuity size er signal amplitude.
1 i
P AGF. No.
11 cF 17
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ass 32s32' B ABCCCX & WILCOX B&W Construction Company l
^ " INSERYlCE INSPECTION PROCEDURE
.' susJECT ULTRASCNIC EXAMINATICN FOR INTERGRANULAR
~- STPISS CORROSION CRACKING IN STAINLISS STEEL ISI-125, P2V. 0 OR NICKEL BASE AILCY P! PING 9.6 If there is any doubt regarding the proper interpretation such of ultrasonic indications in doubt shall be resolved by review of radiographs or per-the area of interest ferming radiography.
9.7 Any area.where best effort inspection was perfc.rmed due to configuration shall be recorded and reported.
A cecy of the examination data
- 10. RECORD OF EXAMINATICN RESCLTS:snall be prov:.ded to the "custc=er wit (Figure 3) infor=ation:
A. Contract Number
- 3. Examination Personnel by Name and /or ID Nurter C. Instrument by ID Nurler D. Method of Test E. Couplant by Batch or ID Nu=ber F. Calibration Sheets G. Weld Identification and Location E. Type, Size, and Frequency of Search Unit by ID Nu=her
- I. Ultrasonic Wave Mede J. Calibration Block Number K. Chart of Results L. Procedure Nu=ber and Revisien M. Dates of Exa=inatien N. Examination Surface ISI-361, O. Layout of Weld Seams as Detailed in ISI-360, ISI-362, Or SLI-36 P. The number (s) of any Field Change Authorization (s) that af fect(s) this precedure.
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INSERVICE INSPECTION PROCEDURE susJacT ULTRASONIC $XAMINATION FOR INTERGRANULAR STRESS CORROSION CRACKING IN STAINLISS STIEL OR ISI-125, REV. O NICKIL BASE ALLOY PIPING I
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A.I-37 831 32932A BABCCCX & WILCOX 8&W Construction Campany INSERVICE INSPECTION PROCEDURE SUBJECT CLT.%SCNIC EXA INATION FOR I.CERGFagua '
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BABCCCK & WlLCOX B&W Construction Company INSERVICE INSPECTION PROCEDURE sueJEc7 ULTRASONIC EXAMINATION 'OR INIERGRANUL'R STRESS CORROSION CRACKING IN STAINLESS STEEL CR NICKEL BASE ALLOY PIPING ISI-125, REv. 0 5 2
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_ _ _ - = Circumscribed rectancle .
- - .- - - = T.jpical indicatien scurce 21 = Oransducer posi:ica for maximum signal amplicude S = Transducer posicien fer mini =u= DTD path
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- 7'igure 4 TWD Example pug ,ya, i
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, ?ss 3:83:C BABCCCX & WILCOX A.I-39 B&W Construction Company INSERYlCE INSPECTION PROCEDURE sus;Ec- U!;RA5CN;C EXAMINAT;os roa IN:EaGFANULAR STRESS CORROSION CRA KING IN STAINLESS STEEL OR NICKIL BASE ALLOY PIPING ISI-125, RIV. 0 oC s rss.2 5
.J67wm a cm C 04
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Figure 5 Indicatica Ficw Diagram P AGE NC.
- 7. o CF 1. o l
~
A.I-40
- S:42 EABCOCK T. WILCOX Ef W Cemrverien Co:nr.ony It'5ERVICE INSPECTION PROCEDURE SUEJEt? _,.v 8
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- 1. SCOPE: This precedure shall govern the pone: rant me:hed of '
exa=' nation in acccrdhnee with Section V, Article 24, Method A.3 and.23..
The examina:icn described herein shall be used for the detection of indications open to the surface. This procedure shall apply to materfal; examined in accordance with the ASME Soiler and Pressure Vdssel Code, Sections III and XI.
- 2. O?ERATOR OCALI?!CATIO :: The examiner performing the examination snall ce cual:.f:.ec c at least Level I in accordance with S&W Constructica Cc pany Ocality Control Administrative Procedure 9A-16~.
The examiner omrfor.ine the evaluation shall be a: leas a ,evel
!! in acecrdance with E&W Const:7ction Company ' Quality Con::cl Adr.inistrctive Procedure 9A-167.
- 3. A9EA OF II:TEREST: The area of interest shall include the areas s::.pulated av
. 2.:s cate:ory. .
3.1 Catecery A: Welds and wold metal" cladding, shall include one wall :n_chness of adjacen base material en either side of the welds where applicable.
3.2 Cateercrv B:
spac:.f.ad in Section M Base material shall include unwelded surfaces as of the ASME Code.
3.3 .Catecery C: Studs, !'uts, selts, and Washers shall be as spec 2.fie.c :.n the Section XI for the part under exanination.
- 4. SURTACE PREPA71.TICM: .
The area of interest and adjacent surfaces w:.:n:.n sand, etc.
ene :.nca snall be free of fiin, scale, dirt, grease, endedded Shot, sand and grit blasting shall not be per!cr:ed on surfaces pric: to penetrant examination. The examination surface 's) shall be prepared in accordance with I.3I-50 except for cach:.ned parts.
- 5. APPROVED PEMETRANTS. C EANERS AND DEV*.'LOPras:
5.1 Visible Penetran't Materials: The following ::aterials produced by ne F.agnnflux Corporat:on may be ur,ed in ccmbination uith cne another,-but shall not be used ir conjuncticn with other manufacturer's materials:
REVISED GY l F.EVISION P AG*i Nc.
i
.- ser p l g u... . a. g. , . 1 OF :*
I '
R d.3 g3sgg c47;.
I l IVissON 5-20-77 cl.TE S-23-76 l
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l- .-
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rs 1st;2a.
--B ASCOOK & WILCOX Bt.W Cons..uction Company - A,7 1 INS ~RVICE IN3PECTION PROCEDURE j 5'J 3J E c 7.3: o...... v _. m. s e s , *.-
.. ..-<,s.. Cu 0 : 1. 2., D n-. u.D mas- c I.. n- ..r.e...r.
. - s- .- . r
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. S . rs-r S ,- hn ,.S & Ta.n.e.st..e.s..S . .e. . _9 4 0 , 3_r,/
. 3 t
Cc=bination No. l~ . Cc=hination No. 2 Penetrant ST1-5 SKL-:'?
- Developer SKD-S SKD-UF Cleans
- : SKC-S SKC-NF Combination No. 2 is preferred and shall be used whenever possible. Materials made by other cenpanies are acceptable provided they are qualified on approved test plates using this precedure.
5.2 Fluorescent Penetrant Materials: The following materials
.creduce: r.v Mawnaflux Corporanzon are acceptable:
Penetrant - ("ygle) ::L-22A Developer - ( yglo) "P-9 Wet Developer - ( v. e. l o) :P-4A Drv.
. Cleaner -
( ygle) "C-7 Other flucrescent materials produced by other companies.are acceptchie provided they are cualified by demonstrating the adequacy of the materials to detect known defects in ac.creved .
, test plates.
5.3 Each batch of materials used on stainless steels er nichel based alleys shall have been tested for residual amounts of total halogen and sulfur in acecriance wit" 252-60. The total residual amount of halogens and sulfur shall not e::ceed the requirements of 25!-60. The penetrant., developer and cleaner batch numbers shall be recorded on the data sheet.
6.- PRE-CLEAN: ,
The: area c': interest and adjacent surfaces, within one inch, shall be cleaned to ensure they are free of 1cose film, slag, dirt, etc.
After final cleaning, the surface shall be checked with a lint-free cloth or absorbent paper to confirm that no dirt is present. The minimum drying time shall be 5 minutes before application of penetrant.
- 7. n.3
_. 2r,..,. . 20 ,. ,, ,, -: r.u . .nA. . .
7.1 The area of interest shall be thoroughly and unifor=1y coated with the penetrant. The penetrant shall be applied.
by brushing, dipping or spraying.
P AGE Nc.
2 ol= 8
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4 m 1 I
l
'*"?"33 S A3 COCK & WILCOX -
Bf.W Construction Company A.I-42
<s 3- 'INSERYlCE N5?ECTICN PROCEDURE :
, SU HECT .e _ry, _ - . u. . . --.
.v...m..C.T
. . _ .w .ro
. . . Ce
. hy,D
. e.oD BAS,_
MATIEI.'-J 3,INCLUD:!*G STU25, :GTS ' & WASHIRS ISI-240,.REV. .3 4
7.2 .Thefarea shall re=ain' wetted vith the visible penetrant forJa minimum of 10 minutes and a maxi =um of 30 minutes. For.
iflucrescent penetrant,.the surface shall remain wetted.for a minimum of 5 minutes.and a maxi =u=~cf-30 minutes. On special applications, the =aximum time limit may be increased when permitted by-the_Custcmer. Any complete. drying of. penetrant-during the penetration time shall require-reeleaning-of the surfaces-and a repeat of the test..The vork piece and the-penetrant shall be at_a temperature betueen 60 and 125 degrees
. F n (16 _ and 52 C) during the penetrant examination.
7.3 After_the penetrant has been on the area'of' interest'fe: the j
, . prescribed amount cf time, all excess penetrant shall be l re=cved by the following steps:
A. Remove all possible penetrant with a clean, dry-, lint-free
,e cloth or absorbent pacer.
- i
- 3. Finish cleaning the surface with lint-free cloths or absorbent paper-that have been da=pened with the approved ,
cleaner. Flushing cf the surface with a cleaning-solution
- for the purpose of removing excess penetrant shall be
, . prohibited.
7.4 The drying of surfaces after removal of the excess penetrant
- will be acec=plished by ner=al evaporation c
- by bolting 4
with clean lint-free cloths or absorbent paper. A minimum
- drying of 5 minutes shall be maintained after all uiping 1
operations have been ec=pleted before the developer i: applied.
- 8. -APPLICATICN OF PEFETRANT DEVELOPER:
8.1 The penetrant developer shall be applied to the surface within 15 minutes after the preceding operations have been ec=pleted.
Licuid developer (selvent or water based) shall be thoroughly agitated and shall be applied by spraying er dipping. Dry developer may be used with fluorescent penetrants and shall be
. applied by soft brush, a hand powder bulb, a powder gun, or other means more suitable to the .si:e and gecmetry of the speci-men provided the powder is ev,enly dusted over the surface to be examined.
S.2 Regardless of the method of developer application a single thin c ating of developer shall be uniformly applied. A heavy coating of develcper shall be prohibited.
( P AGE Nc.
3 of 8
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- s81202' SABCOCK & m! Cox A.I S&W Construe ion Cor peny INSERVICE M5?ECT10N PROCEDURE su sa: - ... T . , . .
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. he 30 r."...".a. a._.i . .d. has e.' arse 3
_ov.dee.' .k.a. k.a. 4 .d .'. . = .i c..s remain-within c: ..
licable acceptance standards. Surfaces-3 which are evaluated after 30 minutes and hava indicaticas
. exceeding the acceptance stand ards s ah ll be cleaned and
- e-examined by the technicue described in the preceding
.caragra hs exce.=t that interpretation shall be started after the developer-has dried for 7 minutes and shall be ecmpleted within 30 minutes.
- 9. . ,s.
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.akan .o r_-a.ven. a.."; 4'ca..
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'4. 4 , 7 a s .4 . .is. va... .v _ '.a c. . . a. a..d e = =..' .' v. '. .=.
.. . . .. =. c. a. d. .
When cuestionable results are cbtained, the curfaces shall be re-examined. .
<,. s, ._ _sa e s.m,,, u ce aa n _2_2_4._2
. _ na _4 . .. .,.. t n.n s ..an.a. deae c.,. . . t_n .. , .. .
e . .n . as stains against the developer, or a bright yellow or gree.--
flucrescent stain.w4, a ainst the develoc.er when viewed with the v ..av. .d .d
- ca .a a ." _4 .. e _ _ .=. k. c.- a ec.'d i . . w ..3 ,.e. 3 : e. s..
.. . . . a . . . _ . . 1_4 ne . . . .
s '. ."_ . . a a .=._-a'
. , d
- o ..e. a v. 4..4__2.a.e e os'~.v _i. .k.=. n.. a . =. ' ' '
and a line of dots mav. indicate a tichtl'1 clesed crach. - .
e.3
. us.o.. . .. .._ n e, < __ * ., e . e s - e.~. ~. o. e.n e . = n . , _k.e .# . . e -r - a .a ..* ..
- . .- h.=. ' ' -
ba. ma' e v d ". .5e add . - o .' a k.
. _' a . k .' .' b..*. . P. _' ..". k.._3 s 4 .. .a .. s e black lic.ht, an extremel.v bric.ht indication of anv.
- -entrapped penetrant will be disclosed.
> 30.
. . . .,r.._..
. . + . :. :
- ..u. . .:. .u. ....n.. . . , . o h. n. .:.n. :
1 3
_' O .1 V i s .' ' ' a_ c. a n a_ . a. . .s . _ *..k. a = . e a .4. . w".4 . '. n .k. . e a.v.-.. .= .. 3 . .= . _' -. n ' sr - a._ .' , -. a. .'.
snal ce a ecuately ille.inated for proper evaluation.
. . _: c .,. s..w. ,1 a.,
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d us'ng .'d.'.a.e ack. A' _i3 -'. . . "'...e '_ _4 1 a..- a. d.. .
, b _' a-. P. 1_4 ., .'. . _' . .
- a. . . s .4 v. s'.a . _ ' _i k,e a .'eas. oc . 'we-,. c = ..d.' a s at the werk e.lece, as maasured using a Weston 703 Tv.=e : I .
~...e .e.. , c . e c." _4 va.' e.t . , w_i .h. o" . _' .# ' a _- _' n. .k. . e ~..a. . a - a.. ' v. i. .k. a . . .
.OX. .
..u.' ..i r _' .d e- d.i s k . "..he bla c P. ' _4 . -5. . . s '..a . .' _' ' = ._. e_ed ultraviolec radiation in the range 3300-3900 angstrc= units.
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-A.I-44.
- Sr32832' . SA3 COCK & h1LCOX l- -
- &W C:,estruction Corepony
-INSERVICE IN5?ECTION PROCEDURE su sa10-. .u .m.. s. .- . .o.a..-e .r .~v-.-
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- 11. arcoa32nG s?ANDARDs: .:ndications in welds, base =aterials and bolting materials, etc., shall be evaluated using.the applicable Asnz Section X: acceptance standards.
11.1 ;.11 indications revealed by liquid penetrant examinations are not necessarily defects, as non-relevant indications are sometimes encountered.. However, all indications.in the weld craters or in the'line of fusion between base material and weld =etal shall be treated as defects. All indications believed to be non-relevant shall be explcred~
by surf ace conditioning and re-e::amined or shall' be re-e::a=ined by other nendestructive methods. If re-examinatien reveals any indications, they shall be censidered defects and be evaluated to =the acceptance standards as specified in Paragraphs 11.4 and 11.5.
11.2 Linear defects are these defee,ts in which the length.is greater than three times the width.
11.3 Rounded defects are those defects which are circular or elliptical with the length less than three times the width.
11.4 Categcry A: Indications found in the area of interest . (as defined n 3.1) shell-be recorded if they equal or exceed the following:
11.4.1 J.ny crack or linear indication with major dimensions greater than a 1/16 inch.
11.4.2 All. rounded indications with dimensions greater than 3/16 inch.
11.4.3 Four or more rounded indications with a major dimension greater than 1/16 inch, separated by 1/16 inch or less, as measured frem edge to edge.
11.4.4 Ten or more rcunded indications with a major di=ensic.,
greater than 1/16 inch, located in any si:: scuare inches of surface,the major dimension of this area not to exceed six inches, with the area taken in the most unfavorable location relative to the in-dication being evaluated.
t .
- PAGE Nc.
N ".
5 0F S i
.c : _ __ _ . _ _ _ _ _ .
e I
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S A.ECOCf. C. WILC37. .
S&W Co,struction Compory A.I-45 IN5ERVICE tr45PECT 0N FPOCEDURE
- m. , s,., .,,.; _, _.
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11.5.1 Only indications with =ajor dimensions greater than 1/16 inch shall be considered relevant.
11.5.2 Anv e
c maw.e_ linearaindication 1s 7 ess %.a . .=. / o 4 c.reater than 1/16 inch len-v m
. .. .. . .. a k..a. . . , g _, e a . c.,
aan 1/8 in.~1cng for materials frem 5/8 in,. thick
- o und_ a..- 2 .4 .. . .*._' . - - k e..d- 3 /.' c' ' d .. . - , '. ~ . ~ . .' c .
_4 .3 . *.... w 4. gp. .s . ..A. m.
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11.3.3 -
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3/ _' 6 .i. . . ." c .- ..4,. k .a. s s z / n 4... '
a . ..d. e..-".* .
11.5.4 Four er more indicaridns in a line separated by 1/16 in. er less edc.e to ed9e.
11.5.5 Ten er more indications in any six scuare inches of a e a ,.,.. s e .,a ,< c c.u . .., s .4o .
. . . _4 _, .o -
,_,_' . .. a . s _4 .. 4 . . .u. . g,
. with 3
- c. 4.cn .e.'.'. 'va .c "..a _4 .' _# _- * '. .' e.,.. unfavorable the dimension taken in the mest
%._i..~3
. . u ,, a ' " = . ' .
..,..=..c. 4. . a 4 4.. 4 ..cn, 4 ,,,
-- _3_4... ..- .c .. .a.ya . . ,. 4nA_4 -u. 3
_4w. ,..- _,i,,
inch and greater in length are unacceptable and
.L.4 C.a. ax.4 a.3 4 . ..a 4 a . 4 . .. ., Lj .. . .,. e _
. w..an . 4.
w ..
... _4n lene. h are unacceptable; en studs, nuts and bolts e- e. .w...an 3
. 1 .4. .. . -
.C 4. 4 n a.1 wn .i . a _4 -. e .
...e .,. 4,3. .--- ,x...:w4w 4
.24 - a.. -4,,s,
..ng _4 . ...ess c: .".o s e - ..._'
4.- - . .. . . . . - a. .#.
in Paragraphs C,n?.4.
a .
4.
..w...4. , s .. a.s11.4 and we
.s 11.5 after investigation by sudface m C.e.- . A.e .a .
. . , .r. .w. a.,.m-, , s . g .,,,nc - .,..e.
. . ...e .w.
. . . . c,. . . ,
.. 4 .. ., d _4c o, _4...a
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examinatien shall be perf crmed. ..
..".e . e .e.. . 4 o n e ' .".e e c:' _4 .. * *. m.i .n _iOnce
~..".n wal_'
the area is cleared,
.". _' . . a s a- .. .". a
be verified. from physical measurements. Alternately, the a_-a_ as e. on..d ".. . v. .". e e x a .._4 .
.. *- e_ d . " c . .' .. .4 . "~ m
."._4 -P...u$ s s ( 5 . _' _' ."". . .
All cleared areas chall be recorded en the data sheet.
1, , _
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S ABC00!! & W:LCOX-S&W Cons:ru:tian Come ny. ..
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A.I . INSEP.VICE IN5?ECTION PP.0CEDUF.E 3J2JE~T PENIO:.*-d:7 EYA!1!h'ATIC::. OT.h'EL3 AND 3ASE MATE?.IALS :: CLUDING STUOS, NUTS & WASMET.S ISI-2 4 0, F2'/. 3 4-3 .. ......,.C.c....,...
. . r- -....w.
When the.exa=ination is ended, the penetran: materials shall be rs=oved as soon as pessible with cleanor or other approved solvents.
1,. .. e . .:.w.y ., e ,- .
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, 14.1 Repeated or prolonged contact of penetrant dye or developer with the skin shall be avoided since these licuids are skin irritants..
14.2 The solutions used in dye penetrant inspections shall be used in well ventilated areas, since they are highly volatile.
- 15. 72 COD OF EF.AIIINATION FISUI.TS : - A copy cf the e::aminatien results witn. One icllow.'.ng :.ndc=.ation shall be maintained and made ' e.
available to the cus::=er (Figure 1) :
A. Contract Nurber
. 3. Method of Test C. Procedure nurter and revisien' D. Batch or ID nurber of penetrant, cleaner and developer E. Chart of Results F. .E:: amination . Personnel by name/cr nurber G. Date (s) of Examination i
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7 ,
f Suppict:onted 9 April tr Mill Power Sunoly. CPO A-02898 D .'. .
(9 Octcher 1971
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3922 5.4863 This cartifics that the cheve described piping reets the 8923 ~54G553 requirerasnts of Ans! 031.7 (1969) Chaptar i - ! !! :.aterials. !
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Appendix II - Preservice Inspection Exarrination Data
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- j
.t j
. A.III-1 .j J
I Appendix III -' Augmented' Inservice Inspection Program !
t Section I -
-Listing of Examinations A.III-2 Section'II. - NDE Schedule A.III-5 Section III - Pressure Test Schedule' A.III-6 l' -> -
'- . Drawing ~ Location of; Break Points- A.III-7 A.III-10 r
. Isometric Drawing A.III-11 i
t '-
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APPENDIX III- .--
~
5:ction I: . Listing of Examinations
, Fig. Break Thick Diameter. Cal. "
N 3. No. Description Ref. Dwg. NDE Procedure Mat. (In.) (In.) Block X.'3.15 152 Safety Inj Accum 1A to MCFI-INC-47 PT ISI 240 TYP 316 SS 1. 0 10-RC Loop 1A Pipe to-Elbow Duke Shop Weld INC 72-1 X.3.15.1 152 Safety Inj Accum 1A to MCFI-INC-47 UT ISI 120,125 TYP 316 SS 1.0 10 50209 RC Loop 1A Pipe to Elbow Duke Shop Weld INC 72-1
, X.3.16 153 Safety Inj Accum 1A to <MCFI-INC-47 PT ISI 240 TYP 316 SS 1.0 10 RC Loop 1A Elbow to Nozzle Field Weld NCIF
, 107 X.3.16.1 153 Safety Inj Accum 1A to MCFI-INC-47 UT ISI 120,125 TYP 316 SS 1.0 10 50209 RC Loop 1A Elbow to Nozzle Field Weld NC1F 107 X.3.17 75 Safety Inj Accum IB to MCFI-INC-47 PT ISI 240 TYP 316 SS 1.0 10 RC Loop IB Pipe to Elbow Duke Shop Weld INC 73-1 -
X.3.17.1 75 Safety Inj Accum 18 to MCFI-INC-47 UT ISI 120,125 TYP 316 SS 1.0 10 50209 RC Loop IB Pipe to 3, Elbow Duke Shop Weld -
g INC 73-1 [j-4
APPENDIX III S:ction I: Listin0 of Examinations (Cont'd).
Fig. Break Thick Diameter Cal.
(In.)
No. No. Description Ref. Dwg. NDE. Procedure, Mat. (In.) . Block X.3.18 76 Safety Inj Accum IB to MCFI-INC-47 PT ISI 240 TYP.316 SS 1.0 -10 RC Loop ~1B Elbow to Nozzle Field Weld NCIF 109 X.3.18.1 76 Safety Inj Accum 18 to MCFI-INC-47 UT ISI 120,125 TYP 316 SS 1. 0 ' 10 50209 RC Loop IB Elbow to Nozzle Field Weld NC1F 109 X.3.19 32 Safety Inj Accum IC to MCFI-INC-47 PT ISI 240 TYP 316 SS 1.0 '10 RC Loop IC Pipe to Elbow Duke Shop Weld INC 102-1 X.3.19.1 32 Safety Inj Accum IC to MCFI-INC-47 UT ISI 120,125 .TYP 316 SS- 1.0 10 50209 RC Loop IC Pipe to Elbow Duke Shop Weld INC 102-1 X.3.20 33 Safety Inj Accum IC to MCFI-INC-47 PT ISI 240 TYP 316 SS 1. 0 10 RC Loop 1C Pipe to Elbow Duke Shop Weld INC 102-2 X 3.20.1 33 Safety Inj Accum IC to MCFI-IHC-47 UT ISI 120,125 TYP 306 SS 1.0 10 50209 RC Loop IC Pipe to Elbow Duke Shop Weld 3, _
INC 102-2 -
g U
6
,_w
fw;.
,m.:
kb APPENDIX III /j s SGction I: Listing of Examinations (Cont'd) ~
s
. Fig. ' Break . Thick Diameter Cal.
No. . No. Description Ref. Dwg. NDE -Procedure- Mat. -(In.) .
RC Loop ID Pipe to Elbow Duke Shop Weld INC'128-1 X.3.21.1 105 Safety Inj Accum 1D to MCFI-INC-47 UT- ISI 120,125 TYP 316 SS - 1. 0 - 10 5020$-
RC Loop 10 Pipe to Elbow Duke Shop Weld INC 128-1.
X.3.22 106 Safety Inj Accum ID to .MCFI-INC-47 PT ISI 240 TYP 316 SS '1.0 10 RC Loop ID Pipe to Elbow Duke Shop Weld INC 128-2
'X.3.22.1 106 Safety Inj Accum ID to MCFI-INC-47 UT ISI 120,125 TYP 316 SS- 1.0 10 50209 RC Loop 10 Pipe to Elbow Duke Shop Weld INC 128-2
.i i
f
~
-s J
~
. APPENDIX III
~5xction II: NDE Schedule Schedule-Fig. No. Break No. 10-YearInterval, Examination Conditions
' X.3.15' '52 Per ASME Section 11 System Pressure: 450 psig.
X.3.15.1 152 System Temperature: 150*F
- X.3.16 153 same same-X.3.16.1 153 X.3.17 75 same same X.3.17.1 75 X.3.18 76 same same-X.3.18.1 76 9
. - X.3.19 32 same same X.3.19.1 32 ,
X.3.20 33 sa' a . same. .
X.3.20.1 33 I X.3.21 105 same same 1
X.3.21.1 105 X.3.22 106 same same
,' X.3.22.1 306 .
M:
7 4
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APPENDIX III ,
'Siction :III: . Pressure Test. Schedule-
=.
System' Break No. Pressure Test
-Reactor 152' Class A System , Reactor Coolant System will be pressure. tested at the~ con -
! -Coolan?, 153- clusion of each outage 'in accordance.'with Station' Technical-
.- 75 . Specification. System will be hydrostatically tested..in 76- accordance with ASME Section XI'once'during the first. '
32 Inspection Interval.
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Appendix IV Calculated Allowable Crack Si::es incorporating a " Net Section Collapse" Criterion 9
I 4
3 m
1.
(
'i _ _. _ . _ . . _ _ . _ , , , _ . .
v, r
A.IV-2 l
Al. Preface j The objective of this Appendix is to calculate allowable longitudinal and circumferential through wall crack sizes incorporating a " net section ,
collapse" criteria for those lines where augmented inservice inspection is i proposed.- Allowable crack size is defined as that length of through wall !
crack which can be present. prior to complete rupture of the process pipe.
The basis for applying a " net-section' collapse" approach to this problem
- Is' derived from experiments conducted by the Electric Power Research
~
Institute (Reference 1).
.c.
+
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d
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yg, f [T n;
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A.IV-3
- 32. Inthoduction an$ Backeround Discussion-Austeniticstainkess. steel'has'highductilityandfracture toughness, consequently,-a large service strength beycnd the yield point.
Because of!these Inherent material properties and based on tests conducted
'by EPRI, 2 conclusions.regarding cracks in an austenitic stainless steel material are evident:
- 1) _ Crack growth will occur in the presence of large scale plastic deformations.
- 2) It would be overly conservative to use net section yield f.e., an
-elastic stress distribution,' as.a failure criterion. Hence, net section collapse is applicable as a failure criterien.
.Research conducted by'EPRI and presented in Reference 1 also indicate the following significant factors regarding the failure process:
A) . Because of crack tip blunting preceding crack growth', the applied stress at failure is Ir. dependent of flaw sharpness.
B) Flaw area -(net) 1s more significant than flaw shape in determining the applied stress at failure.
C) The presence of a weld near a flaw and the sensitization of the material in the heat affected zone surrounding a flaw do not significantly affect
-the applied stress at failure, in the application of a net section collapse criterion, it is assumed that due to. tne large amount of plasticity, the stress distribution in the net section is uniform. Crack growth and fracture are governed by this stress distribution reaching a critical, temperature dependent, value. The research conducted by EPRI Indicate that this value is well in excess of the yield point of the material. The critical value of this stress distribution will conservative *, be assumed as the yield stress of the material at the operating . temperatu re. Equations for force and moment equilibrium can then
- be developed from which a net section area is derived. Knowing the net section area, the allowable crack size can be determined.
/^
'h -
- A.IV-4I!
i i
A3. Aeolication of the Net Section Collaose Criterion to Lonoitudinal Throuch Wall Cracks Consider a section of. pipe with a through' wall.'iongitudinal crack:
N a = Allcwable crack length'(in) pi N o 4'
- ao - p = Hydrostatic pressure (psi) l I -
' t = Pipe wall thickness (in) j 9
- L = Effective length of pipe (!
J e L
t f e~
Assume that only the hooc stress due to internal pressure and the force associated with it w*ii cause crack propagation. The assumed stress distri-bution across a length of pipe, L,, is shown below:
I y
a <. a ., , ,, ,, o (ggp=Hoopstress(psi) fY'P* = Yield stress at temperature (psi) l T
V.Y p.
o pa o :
j i
<r
> P l l qp
- L ,
e
,o A.IV-5 Considering the equilibrium r,f forces: ,
. ( (,p,) (Anet "'Ikoop}Il}(} e A,,t =((,,,) (L,) (t) = t (L, - an) -(Equation 1)
Ih.p.)
{yp = Pg (D-t) 2t where: p, = Hydrostatic pressure (psi)
D = Pipe outside diameter (in) t = Pipe wall thickness (In) .
A =
Net area (in )
Substituting.the expression for Q p into equation 1 yleids:
~*
, .t .Pg (0 - t) (L.)~
2t ( 7.P.) Y t
-b
.i" -
i j
l A.IV-6 j A4 ApoIIcation of the Net Section Collaese Criterlen to Ci rcumferential Thrcuch Wall' Cracks Consider the assumed stress distribution on a section of pipe '
with a circumferential through wall crack:
Crack p g
T /t a c9 _ _
c,,) R w- i f F, Rm__ + t) ,
a Y-B (cos - -
g _,_,
f "m / _
r.- -
N, i . I t
[v.p. d; v.p.
Where: p g = Hydrostatic pressure (ps!)
f, =
Axial force.due to thermal + seismic forces (lbs)
F, = Total appiled axlel force = (f +f press)/2 (1bs) f p ,
= Axial force due to hydrostatic pressure (1bs)
=
. N, Maximum allowable moment (In-lbs)
Rg =
Inner radius (in) t = Pipe wall thickness (in) oc = 1/2 total allowable crack size (angular) g,p, = Yield stress at temperature (psi)
R =
Nean radius (in)
Equation'for force equilibrium:
(rr - =c - @) m(R ) (t) ( f'.p. y ) - (@) (R m ) (t) ( f '.p.
y ) = Fa 9= fr - ac - F,
- 2 2 ( f'.y p. ) (Rm ) (t) N *"
i
.(\.
l Where,S.is defined as the point of stress inversion for the net section.
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- -, A.IV-7 j
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- . , *-P A ,
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l A.IV-8 i
AS. . calculations A5.1 Accumulator inleetion Line Since cal 4.ha. locations where augmented inservice inspected is proposed on the accumulator injection lines are identical with respect to pipe dize, pipe material, and design operating conditions, the calculated longitudinal crack size will be identical at all 4.he. locations. The calculated circumferential crack size will vary only because the applied axial forces and bending moments vary. Node 105 (reference Figure 11.53),
which has the largest applied axial forces and bending moments, will ce used'to calculate the smallest circumferential crack size.
AS,1.1 Longitudinal cracks- .
Pipe material: .SA-376, TYPE 316 Pipe schedule: SCH-140 0.0. = 10.75 in I.D. = 8.75 in t = 1.00 in P; = 2485 psig T = 650 F .
cy, = 18,500 psi Assume an Le of 12 Inches:
ao = L. - P r (D-t) (le)_
. 2t (cy.p.J (10.75 - 1.00) (12) (gge)
- 0
- I ~
2 (l.00) (1o500) ao = 4.09 in .
Note: The assumed length of 12 inches for Le was based on EPRI flat plate tests utilizing c center-cracked tension panel that was 12 inches wide.
A5.1.2 circumferential cracks .
fpress = P g x tr (l .D.)2/4 = 14942 lbs.
fa = 18868 lbs.
Fa " (f a + f press) /2 = 84,599 lbs.
Ma = 711,120 In-lb.
Rm = 4.88 In.
The applied axial forces and bending moments are a result of detailed stress analysis that considers the effects of gravity, seismic movements, and thermal expansinn. The maximum moment is calculated from f
,- Ma " (My +Mz)
Sir.ultaneous solutions to equations (2) and (3) yield l
- (" = = 360 an= 2= _ (0. 0. ) = 6. 76 i n
t --
A.V-1 APPENDIX V l
ANALYSIS OF CONSEQUENCES AND SHUTDOWN METHODS The following tables describe the consequences of the postulated breaks for I which physical protection cannot be provided and discusses the methods for shutting down the plant following the break. Worst case active failure is assumed to occur concurrently with the break.
1
_.2 . _ _. . --
, - ____ p
, : 4:
7 ;s
- ' ~
. TABLE V . -
~
ACCUMULATOR INJECTION l(NE BREAKS PROBLEM NI-Ol' '
- :496j 4 .
LBrecki .Circumferential. ' Longitudinal _ Active .
~ Target Node Target Failure Consequences Shutdown Method
'152- 16" SG Feedwater Outboard LOCA plus loss of blowdown and. Emergency Core' Cooling: System.
2" SG Blowdown' NM cont. sample lines. Resulting '(ECCS) is designed to protect
'3/4" NMl Hot Leg. isol. pressure and temperature .
core against consequences of-3~
Sample viv. transients are. insufficient:to this LOCA. *
~~
(2) 1" NM SG .cause' containment overpressur-Sample ization or temperatures above allowable limits. 'Addi-tional' loss of reactor coolant-and additionalisteam release are-insignificant due to.orificed sample lines. Possible loss of containment integrity. (Malines) 4" Pzr Spray Multiple cold leg LOCA breaks. .ECCS designed to protect core 3" Charging Total break only.approximately~ against consequences of-this'-
9% of largest double ended LOCA.
cold leg break area.
3/4" NM Hot Leg Outboard LOCA plus loss of sample lines. ECCS designed-to protect core.
Sample NM cont. Additional loss of reactor against consequences of this.
(2) 1" NM SG isol. coolant and additional steam LOCA.'
Sample- viv. release are insignicficant due to orificed sample lines.
Possible loss of containment -
integrity. *
- 153 3/4" NM Hot Leg Same as.above. Same as above.
Sample (2) 1" NM SG Sample >
1 hJ '
i
.m, .g . . _ _ .
s-
' TABLE V-1 ACCUMULATOR INJECTION LINE BREAKS.
PROBLEM NI-02 Break' Circumferential Longitudinal Active .
Node' Target Target ~ Failure Consequences Shutdown Method 75- 2" Aux Spray Any Mulitiple cold leg LOCA breaks. ECCS designed to protect core 4" Pzr Spray Total break area only ap- against consequences of this proximately 8% of maximum LOCA.
doubled ended cold leg break area.
3/4" NM Hot Leg 3/4" NM Hot Leg Outboard LOCA plus loss of sample lines. ECCS designed to protect core Sample Sample NM cont. Additional loss of reactor against consequences of this (2) 1" NM SG (2) 1" NM SC isol. coolant and additional steam. LOCA.
Sample Sample viv. release are insignificant due to orificed sample lines.
Possible loss of containment integrity.
76 Same as longi- Same as Same as above. Same as above. ~
tudinal targets above above.
1
.?
?
m 9
TABLE V-1.
ACCUMULATOR INJECTION LINE BREAKS-PROBLEM NI-03
~ '
Break- Circumferential Longitudinal Active
. Nodi Target Target Failure Consequences' -Shutdown Method- [~
- 32 LOCA plus loss of blowdown .
~
L16" SG Feedwater Any ECCS designed to protect core 2" SG Blowdown line. Result?ng pressure and against consequences of this and temperature transients are. LOCA.
insufficient to cause contain-ment overpressurization or temperatures above allowable limits.
33 16".SG Feedwtr Any Same as above. Same as above.
3/4" NM Hot Leg Outboard LOCA plus loss of sample-lines. ECCS designel to protect core Sample NM cont. Additional loss of reactor against conrequences of this=
(2) 1" NM SG isol. coolant and additional steam LOCA.
Sample vlv. releast are insignificant due to orificed sample lines.
Possible loss of containment integrity.
p.
1 A
TABLE V-1 ACCUMULATOR INJECTION LINE BREAKS PROBLEM NI-04 Break- Circumferential Longitudinal Active Node Target Target Failure Consequences Shutdown Method-105 16" SG Feedwater Any LOCA plus loss of blowdown- ECCS designed to protect core.
2" SG Blowdown line. Resulting pressure and against the consequences temperature transients cre of-this LOCA.
insufficient to cause containment overpressurizat'ica or temperatures above allowable limits.
106 6" Hot Leg Any Simultaneous cold leg and CCCS and Safety Injection Injection hot leg LOCA breaks. This System capable of mitigating RTD combination of breaks is consequences of these less severe than the limiting LOCA' s'.
16" SG Feedwtr Any Same as circumferential node Same as circumferential node 2" SG Blowdown 105 targets. 105 targets.
3/4" NM Hot Leg Outboard LOCA plus loss of sample lines. ECCS designed to protect core Sample NM cont. Additional loss of reactor against consequences of this (2) 1" NM SG isol. coolant and additional steam' LOCA.
Sample viv. release are insignificant due to orificed sample lines.
Possible loss of containment integrity.
f Un-
- _ - _ _ _ _ _ - _ - - - _ _ _ _ _ _ _ _