ML19309D515

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Forwards Assessment of Reheat Cracks in Reactor Vessel Nozzle Regions Discussing Results of Ultrasonic Insps.Rept Concludes That Reheat Cracks Found in Vessel Nozzles Are within Acceptance Limits of ASME Code Section XI
ML19309D515
Person / Time
Site: North Anna 
Issue date: 04/07/1980
From: Slyvia B
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Harold Denton
Office of Nuclear Reactor Regulation
References
315, NUDOCS 8004100410
Download: ML19309D515 (46)
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Text

{{#Wiki_filter:v e 4 VIRGINIA 15LECTRIC AN n Pow n a CObtPANY Hrcuxonn,VzuonnzA 20261 April 7, 1980 Mr. liarold R. Denton, Director Serial No. 315 Office of Nuclear Reactor Regulation LQA/ESG:rab Attn: Mr. O. D. Parr, Chief Light Water Reactors Branch No. 3 Docket No. 50-339 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D.C. 20535

Dear Mr. Denton:

REACTOR VESSEL N0ZZLE INSPECTION REPORT NORTil-ANNA UNIT NO. 2 Enclosed for your use is a report entitled " Assessment of Reheat Cracks in the North Anna No. 2 Reactor Vessel Nozzle Regions." The report includes the results of the recent ultrasonic inspection of the nozzles, and the Westinghouse evaluation of the inspection findings. The report concludes that the reheat cracks found in the vessel nozzles are well within the ASME Code Section XI acceptance I limits and do not impair the integrity of the vessel. Very truly yours, B. R. ylvia Manager-Nuclear Operations and Maintenance Enclosure 8 0 0 410 04 to

ASSESSMENT OF REHEAT CRACKS IN THE NORTH ANNA NO. 2 REACTOR VESSEL NOZZLE REGIONS SUM'iARY The ultrasonic test indications observed during the inspection of the North Anna #2 reactor vessel nozzle are characteristic of reheat cracking. This reheat cracking condition has been addressed in the three Westinghouse reports sent to the NRC in 1971 (References 1, 2, 3). These reports include a met-allurgical investigation 'of reheat cracking as well as a fracture mechanien assessment. The reheat cracking was characterized (References 1, 2, 3) es grain boundary separations in tts base metal, restricted in depth to the grain coarsened part of the weld heat affected zone (HAZ) beneath the weld bead overlap. The maximum depth of cracking observed in this zone was 0.100 inch. The maximum depth of the HAZ in this overlap. area was less than 0.125 inch. (note Section A). Analyses of the reheat cracks have been made per the method defined in ASHE Code Section XI, IWB 3512.1 and are.well within the acceptance limits (note Section B). The assessment of the metallurgical characterizacion and the ultrasonic test results concludes that the structural integrity of the vessel has not been impaired. SECTION A - Reheat Cracking - Metallurgical Characterization Reheat cracking as found in the North Anna nozzles was a subject of an extensive international cooperative research effort around 1970 to 1974. The characteristics of reheat cracking were well-defined and agreed to by the metallurgical and welding g groups working on this subject. The results of these program's were documented in the Welding Research Council Bulletin #197 dated August 1974. These results were considered and were concurrently implemented-by Regulatory Guide 1.43. The cracking occurred in a region of the coarse grained structure resulting from the first bead which was subsequently reheated to a temperature in the range of 1100' to 1300* F from a second bead applied adjacent to the first bend. During the subsequent post weld heat treatment, this reheated coarse grained region at the overlap area underwent creep at the grain boundaries resulting in intergranular cracking (rchent cracking). The reheat cracking was characterized (References 1, 2, 3) as grain boundary separations in the base metal restricted in depth to the grain coarsened part of the HAZ beneath the weld bead overlap. The maximum depth of cracking observed in this zone was 0.100 inch. In addition reheat cracking has been characterized as multiple cracking, essentially rows of grain boundary separations, which are located in the base material at the overlap of the weld clad bead,. Figures 3.1 or 3.4 of Reference 2. The extent of the numbers of these cracks can be seen in Figure 3.2 of Reference 1. This characteristic appearance of a multi-tude of cracks was observed on all the nozzles in North Anna No. II, note Section B Ultrasonic Test Results. The maximum depth of the HAZ in this overlap area was Isss than 0.125 in. Reheat cracking occurs in SA508 Class 2 materials af ter post weld treatment (PWHT) of one layer cladding where high heat input weld overlay cladding procedures were applied (Ref.1, 2, 3). The weld ove.rlay cladding proce-dure for the one layer cladding for the North Anna No. 2 nozzle was the automatic ges metal are proc'ess (details in Appendix A). Ultrasonic indications in the nozzle protrusion (note Section B) are not considered to be significant since these indications are located within the 0.65 to 0.74 inch austenitic stainless steel

cladding and the welding procedure usrd was' a low heat input, multilayar, ahicid:d metal are veld process. The fabricator was Sulzer Brother Limited who was a sub-contractor to Rotterdam Dockyard Company (Re'ference 2, Table Q.1-1). A review was made to determine whether underclad cracking (cold cracks) could be present; the weld cladding procedure used (Appendix A) precluded the potential for underclad cracking. Underclad cracking has been observed only when a second layer of cladding has been deposited without the use of preheat. There have been no reportable instances of under clad cracking where one layer cladding has been deposited with a cladding procedure requiring preheat and postheat temperaturca equivalent to that used for the cladding of the North Anna #2 nozzles. SECTLON B - Ultrasonic Test Results Description of Ultrasonic Testing Technique The examinations were conducted f rom the clad nozzle bore surfaces using 70 longitudinal wave, dual element, transmit-Receive scarch units manufactured by Krautramer/RTD/BAM. The time. The time base of the instrument was calibrated on 2mm diameter side-drilled holes at depths of 3mm, 7mm, and 11mm. Test sen sitivity was established on the flat bottom of a 2mm diameter hole drilled just below the clnd/ base metal interface in a representative calibration block. Af ter the test system was calibrated, instrument sensitivity was increased by 6db for scanning. Scanning was conducted on the clad nozzle bore surfaces in both circumferential directions. When an indication was detected, instrument sensitivity was returned to the primary reference Icvel and the maximum amplitude obtained. If the amplitude was equal to or greater than 50% of-primary-reference,. the indication was recorded per the criteria defined in the procedure. The calibration sensitivity of this examination technique is at least 5 times that required by conventional ASME Section XI examination methods (3/32 side drilled hole). This f act was demonstrated by making a direct comparison between the instrument gain required to set the amplitude of the 2mm diameter flat bottom reference reflector to 80% of full screen he'sht versus that required to obtain the same signal amplitude f rom a side drilled hole of the same diameter and depth. Calibration on the flat bottom hole.resulted in an instrument gain setting 14-16dB greater than that for the side drilled hole. Areas where reportable indications were detected with the 7 search unit were avaluated with a KBI, Gamma Series, 5.0MHz, 0, transmit-receive search unit. Calibration for this examination was established on the flat bottom of a 2mm diameter flat bottom hole drilled to the clad / base meta 1' interface in a rep-resentative calibration block. Any indication detected by the 70 longitudinal wave inspection and also detectable by the O straight beam inspection was considered acceptable by the criteria defined in the test procedure. A copy of the detailed test procedure is attached as Appendix B. The nozzle bore examinations were conducted by qualified ultri.onic test operators from Sonic Systems International, Houston, Texas under the direct supervision of Westinghouse personnel. Personnel and equipment certification records are on file. INSPECTION RESULTS Ultrasonic test results of all six reactor vessel nozzle bores revealed a distinct pattern of individual indications in circumferential rows. (1-1/2" to 2" apart in the exial direction) around the nozzle bore which is characteristic of reheat cracking. (2)

This pattsrn of rehzat tracking can be cern by referring to Figure 3.2 of Refsrcnco 2. This figure illustrates that reheat cracks occur in a distance pattern consisting of a multitude on individual cracks aligned to parallel and in discrete rows. The multitude and repetitive nature of the reflectors noted in the North Anna Unit II nozzles precluded complete recording. Therefore, reflectors were mapped in random sections to demonstrate the repetitive nature of the condition. The reflectors had typical lengths of 3/8" and fell in discrete rows of bands around the nozzles. Calibration and row data sheets, and ultrasonic reficctor plots of all six nozzles are included as Appendix C. The ultrasonci reflector plots show recordable reflectors which were marked during the ultrasonic examination. All recordable reficctors were not marked and sub ' cequently were not mapped, but these reflectors, fell within the pattern characteris-tic of reheat cracking. Recording of all indications would have resulted in mapping of rowa of reflectors arouad the entire circumference of the nozzle. Only a sampling of recordable reflectors were marked and plotted to demonstrate the repetitive nature of the indications. The individual reflectors that are plotted are f rom a row of recordable indications. Evaluation of Test Results From the recorded indications and from observations made by Westinghouse personnel during the ultrasonic testing, the reflector characteristics conform quite well with the criteria defined for reheat cracking. Reflector lengths are typically 3/8", lie in discrete bands around the nozzle which are separated by,1 1/2 to 2 ' inches, and' occur in clusters. N 1 f Reficctor lengths were measu' red using a 12dB drop method. The longest reflector was f ound to be 0.5". The inherent conservatism of this sizing method when applied to small reficctors has been demonstrated by the fact that the 2mm diameter flat bottom hole in the nozzle bore calibration block yields an ultrasonically measured length of 7.5mm. Current NDE technology do.es not permit a direct measurement of through-wall dimensions. llowever, many reheat cracks have been destructively examined in earlier investigations (Ref. 1, 2, 3). From these data and from extensive knowledge of the reheat cracking phenomenon a reliabic estimate of the through-wall dimensions can b made. These flaws are restricted to the coarse-grained region directly beneath weld bead overlaps and have been found to be less than 0.100" in depth. Since the maximum measured depth of the coarse grained area near the overlap area was 0.125, a conservative assumption of individual crack through-wall dimensions is 0.125." These individual flaws, 0.125" (a) and 0.5 (1), distributed throughou't the nozzles in a pattern described in the " Inspection Results" section of this report were characterized accordi'ng to the rules of IRi-3000, ASME XE,1972 Edition. Review of IWA-3000 indicated it was not necessary to apply the criteria of IRA-3330 for multiple planar flaws or IWA-3350 for parallel planar flaws during the characteri-zation process. In the first case, distances between adjacent rows of indications were 1-1/2" to 2", much greater than 2ay (1/4"); refer to ASME XI,1977 Edition, Figure IWA-3330-1, Surface Flaw #1. In the second case, although the primary planes of individual flaws in a row were less than 1/2" apart, they were not displaced cxially so as to significantly increase the effective length of the flaw (1/2"); refer to ASME XI,1977 Edition, Figure IWA-3350, Semi-Elliptical Surface Flaws. (3)

Thus all indications were characterized as individual planar surface flaws with through-wall dimensions equal to 0.125" and lengths of 0.5" for ASME XI preservice acceptance calculations. For the North Anna Unit 2 inlet nozzle bores, the nozzle thickness is 13.0" calculated per the method defined in ASME XI, Table IWB-3512.1, note 2, where t=(tn1 + tn2 ) +2. Dimensions tn1 and tn2 were obtained f rom nozzle f abrication drawings. For an aspect ratio (a/1) equal to 0.25, the allowable surface defect size is 3.1% ~of the nozzle thickness (a/t) por Table IW3-3512.1. Given a reheat crack where a=0.125", the actual a/t value is equal to 0.96%, well within acceptable limits. (See Figure 1) For the North Anna Unit 2 outlet nozzle bores the nozzle thickness is 10.65" per note 2, Table INB-3512.1. For an aspect ratio (a/1) equal to 0.25, the allowable surface defect size is 3.1% of the nozzle thickness (a/t) per Table IWB-3512.1. The reheat crack through vall d Lmension of 0.125" translates into an actual a/t value of 1.17%. Again, this value is well within ASME XI acceptance limits for' the nozzle bore. (See Figure 2) Indications in inlet and outlet nozzles in the vicinity of the nozzle safe end welds were evaluated per the 1977 Edition of ASME XI, Table IWB-3514.2. Considering a reheat crack where a=0.125" and 1-0.5", the allowable flaw size in percent of i the component thickness is 9.5%. The actual flaw size in percent of thickness is 5.0% for the inlet nozzles and 4.7% for the outlet nozzles, acceptabic per ASME XI. (See Figure 3) [ (4)

References 1. Mager, T. R. et al, " Reactor Vessels Weld Cladding - Base Metal Interaction". Westinghouse Report WCAP 7673-L, April 1979. 2. Mager, T. R. et al, " Reactor Vessels Weld Cladding - Base Metal Interaction". Westinghouse Report WCAP 7673-L Addendum 1, August 1971. 3. Mager, T. R. et al, " Reactor Vessels Weld Cladding - Base Metal Interaction". Westinghouse Report WCAP 7733, July 1971. 9

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APPENDIX A NORTH ANNA N0. 2 N0ZZLE CLADDING PROCEDURE

1) Base material specification grade and type.

The base material of all nozzles in the North Anna No. 2 reactor vessel is ASTM A-508, cl. 2. 2) Process type, electrode sizes

-. Single layer clad. using automatic gas metal arc with cold wire addition and oscillation, 2 wire process using 1/16" diameter wire 3)

Heat input for each layer (Amps, volts, speed) Amps = 230 - 290; Volts = 34 2; Speed = 4 inches / minute 4) Pre-heat, post-heat, interpass temperature Pre-heat temperature = 120*C (250*F) minimum. Post-heat temperature = raise pre-heat temperature to 205'C (400*F), hold for 2 hours, cool to ambient (soaking heat treatment.) Interpass temperature = 200*C (392*F) maximum. f

5) Post weld heat treatment (PWHT)

Intermediate PWHT = 1100*F - ll75'F held for 15 minutes Final PWHT = 1100*F - 1175'F held for 1 hour /in weld thickness.

6) Stress relief heat treatment Stress relief heat treatment is the same as shown in Item 5 above.
7) Manufacturer and sub-contractors The reactor vessel was manufactured by Rotterdam Dockyard Company, Rotterdam The Netherlands. The nozzles were clad by Sulzer Brothers Limited, Winterthur, Switzerland as a sub-contractor to Rotterdam.

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~ Addendum pl D)dh f Yl 12/21/79 o ul u '\\d _a j ULTRA 50: TIC TEST PROC'EDURE FOR DETECTION OF SUB-CLADDII;G CRACKS IN REACTOR VESSEL N0ZZLE BOREc 1.0 SCOPE 1.1 This document provides supplementary calibration requirements an'd a'dditio'nal s~cahhin~g requirements for outlet nozzles. ~ 5.0 TEST SENSITIVITY Add the following paragraph 5.3 " Calibration shall be checked at four hour intervals during the examination. If, during any calibration check it is determined that the primary reference amplitude has decreased by 20% of its amplitude, all data sheets since the last calibration check shall be marked void, a new calibration sheet made, and the voided examination areas reexamined. If the primary reference amplitude has increased by 20%'of i its amplitude, all recorded indications since the last valid calibration check shall be reevaluated with the corrected calibration and their values shall be changed on the data sheets". 6.0 SCANNING - 70 EXAMINATION 5.1 Add the following sentence ~ "The end f: e of all outlet nozzle projections shall be scanned in two circumferential and two radial directions". l l 1 i s l l ^ '^- ^-

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Serial No.

Oc<SLA E Fixturing (if any):

Sweep Lencth : O.78 Style or Tvoe No.

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serial No.

006696 Fixturing (if any):

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fode Select:YA Reject:CrF

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C/O,5'7t; rixturing (ir any):

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  • 1 W<R90 ANd hHd CALIBRATION CHICKSl TIME

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c 10 g') {

rixturing (if any): Sucep Length : f - l.3(o Style or Tvoe No. : WD-MtA DEPTH,AMPL.lA W. Sweep Delay :2-0.05 Size s Shape : 1% m # rm:. 3 i ee "h:lse Length / Damping:WM Precaency

M.OMiZ.

_A 3m m ~ Trcq.: h q Rep. Rate: $)( Serial !;o/ Brand :Havrdsr,& C. - - 6 %,,L Syj. f 35 ,...I Filter:l4; video:"kJack T ~ Measure:!. Angle _.1 Ad - A IIAm l 3EC/Cate Switch:cffRange \\" l D S tri 8vYO ' 88 lode Select-TA Reie:t: CEF Couelant Brand:9scMM(g 40 ~ ~ 3ain (coarse) :$f C (fine) : 5 Couolant Batch: 7 9,Q & Y -~ e OAC PLOT LI:2.ARI~YCAL./ f \\ Amplitude [ y' 1 2 1 3 1 6 j 5 lSTR. sc luigh Nw yiohitom _. _ m._ ._.c 1l ! _ Ml l ,h-1 i 4 +1 A 2l y I sK l =o['7lil7,};: 3 j, x p....,,,,i,,,,,,, %,7 l8 l\\ EL-6 4 3-4-s-a 7 -- a -- a s o- ~ A!!PL. CONTROL LI!FARITY Initial l 4 dB Fesult RECORDABLE EXAMINATION U;DICATIO!; CCP.MENTS/REASCN FOR MO Yo WELD / AREA INCO.2LETED SCAN (S) 80 l -6 Yes No 80 i -12 /q % 6/le.'kf NozzlLI-I ISEE A++AcMGD Shetis lQ fo 40 l +6 i / cCP C Inti4 l l+12 , g pg 20 @ b o v H t +- V CALIBRATION CHECKSl TIME I ~ Initial Cal. lQ'4 D l l ~ Intermediate l } *, f Inte =ediate (T. 4 6 7.". Interrnediate lT. 9 5 Final Cal. l lT. o S ! 4 D, ate 3-2-60 Level I ADDITIC':AL SHEETS?(CHECK BOX) N INERS 1 b Continuatior:l // Date 3-21-80 Level 1 f g ) ' Data N m[* ' Supplements' VNone ggg

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(,, v.,.., f, l Q ~ J ' c.- ,fi 31~ Plant / Unit dothd OMA E_ D.~ta Shest No. ' '~~ ~

  • l Comp / System Pr c.c7eR CALIBRATION DATA SHEET Procedure No.

Subject 6 l f.n M o72 tr-RcRE Rev/ Change No. Calibration INS *RO1NT SET ~INGS SZ7dCH UNIT Block No. '~'

  • ifry/Model No.: face Me,1 Scan Angle:

"'{ o

  • Mode: R.L Se_ria1 No.

OcfrLA g Fixturing (if any): Sweep Ianeth : O.'18 Style or Tyoe No. : D-MM CEPTH,AMPL. Am;. Sweep Delay :

2. 29 Si=e & Shaos: I B rnm rn e' "'

M Pulse Length /Da cing: Dh 4. Prc=.:ency 7 Mut.. 4 '2,,, p l' req. : [ rft.i t Rep. Rate: St' Serial No/ Brand 59 8 - t~12 - ~l m r., ' e n ( t-- Measured Angle : ~10' [. Il% W4 . Filter:llr Video: Jack:--p/4 3EC/ Gate Switch:CG Rance :l" ' O ? a; 90% & ~ 0 4cde Select: Rej ect: CC F Cocolant Brand: So.3cTeocc 40 3ain (coarse): TO (fine): N Couslant Batch: M 7_1i2{ ~ ~ ' ~ l DAC PLOT f T 1 1 2 1 3 1 6 6 5 INSTR. L!!. ARITY CA;../ I I 8 f,f I 9 A=plitude / sc i f yo i t High Low l JHighl Low '3CAN AREA- - 8 l i i' u/ 1 l [5 l l

g. i 4 q 4

+ g i + + 13 i t s 2l y lei j ,4- -l-f l l l l l I 1 i i I i e 6 I r-3 f7 l lei..l.... l e t, l.... l.... I p.. l.... l.,.........,l s [ 8 I l D s 21 4 s a 7 a a to Ww g 1 / M7 E AMPL. CONTROL !.I!.TARITY l.,CORDABLE ) g. g,' 'i 7) Initial 6 dB l Result E 1 CCMMENTS/ REASON FOR EXAMINATICN . INDICATION .g' " " B0 -6 M ELD /AEUA INCOMPLETED SCAN (S) Yes l No 80 -12 l9 bMM / ! I @ % m es 40 l +s go n.fr! F r Nend l

  • 5EE hr7Bt#Eo gnFETs 20 l+12 gc)

/ 6 L CALIBRATION CHECKSl TIME 1 Initial Cal. l T(: 53 1 Inter ediate Intermediate .r. Intermediate I Final Cal. 10: 35 E.W INERS 1(d k dDate $-2Me Level ADDITIONAL SHIETS?(CHECK BOX) ,. T ,[ MDate3 23 fo Level ~I~ ,,.. ? continuatier) [ / . Data,Y supplements None 0,,- .A*

' E'$., s .,q,h, O ~ PlintTUnit_ho?rtl kMM AE Dcta Sheet No. " ~ ~

  • Comp / System Ederv'reR CALIBRATION DATA SHEET Procaduro No.

Subject l ~ f.n dmts PcRr- ,.'Rev/ Change No. Calibration INSTRO'I'NT SE':'I'INGS SEARCH UNIT Block No. Mfg /Model No.: $emicfrgt'_ I-Scan Angle: O, Mode: l__ m.,% ~ serial No.

CO%9E Fixturing (if any):

SVtep Iencth

  • l.SO Style or Tvoe_No. :

A.. f '. DEPTH lAspL. u Sweep Delay v.'3 8 Size & Shace: g[t4 Tru-'r' 8 Pulse Length /::a cing: TY1.4 Precuency 5.0 fMt z.. E'. L [ AM i 90Nl7/d1 Preq.: 5 Rep. Rate: Sg Serial no/ Brand: ta 900 g - R.

z., '

~ 0 _6 5As 7 Filter: MI Video:. Jack A Eeasured Angle DEC/Cate Switch:05F Rangen!" C fo W%~ ~ "~ S o oT E cc c tjo

'. ode Select:

Reject: CW Couplant Brand: c ~[ 3ain (coarse):~10 (fine): I Couolant Batch: 'N 264 ~ ~ OAC PLOT c _--- I e INSTR. LIFEARITY CAL. i' 1 2 i J & i 5 f ?r I 1 A=plitude [ sc ',\\' !I To 8F GCs !!igh l Low l Mghl Low _ SCAN AREA-ac i s. 4 +1 4 .} 1 f l + l +

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.. f' 2 I/ I 6 t j i i L j i. 3 'c % V 3[ ^ ' I i [ 7l l so 3 l ,,..i.,,,,,g....i....i,,.......i.........,...., ,.m m, 0 1 2 3 4 s s 7 a e so k=,d y l8 crr [O) A:"PL. CONTROL LINEARITY RECORDABLE Initial l 6 dB l Result CCMMENTS/ REASON FOR EXAMINATICN , INDICATION 80 -6 38 WELD / AREA INCCMPLETED SCAN (S) lQ 80 -12 I w A,o m tr.f ' l l 40 +6 to l Loop B. hrT 20 +12 go / ~ Loop 'C' ovngT CALIBRATION CHECKS l TIME l h l ~~' Initial Cal. 4 ( 5'. 40 ~ Intermediate Intermediate .o ' 'l." InterTnediate Final Cal. I'l. 0 0 7 4,..,. D, te 3-?o@Levelf ADDITICNAL SHEETS? (CMECK EOX) EXAMINCRS I M A R a //.14) 'u[Date 3 Zo.?pLevel._; '.[ Continuatior) g y g. pat g [ R/ a, ,.1 ; supple:nents none o

}.. - 5.. ,_..Ah, c.- w. . ~ p.' "V a. o-ra Shest No. C* PlentronittkRH1 Am4A 1 ~ Procedure No. Comp / System /PtAc.tr>h N07/J6 CALIBRATION DATA SHEET ~ ~ ~ Subject f.n. lcDPA\\HtLV/cpcmntcopgwH$ Rev/ Change 1;o. Calibration INSTRCMDIT SZ?rISOS SEARCH UNIT Mfg /Model No.:ScNC. Mr+2 KI Scan Angle: (f Mode: /s Serial No. Oto gq F Fixturing (if any): "$7p Sweep Leneth : 3-2 2 $ Style or Tvee No. : L' ^ ~ Sweep Delay : /- 4,20 Size & Shane : [o m m / rm-v Pulse Length /Ca=ci.ng: N\\l)4 Fre=aency

  • S M u z.

A %M! kh'hlt hdfilhL $ J ? req. 5mur rep Rate: 31< Serial No/arand ig r3 9.00;t - - B qmm ?ilt~er:#l**' videc hMackM Measured Angle ~:-GL ~.... Il W ~~ ~**s' DEC/Cate Switch:TA Rance:YI' [ hM ROW E5 Mode Select:TA Reject: off" Couclant Brand:S m g h y.d p y o 3ain (coarse):RO (fine): b Ccuolant Batch:7QRY ~~ u':d DAC PLOT .STR. LI!I: ARITY CAL,[ 1 l 2 l 3 1 6 1. 5 ff lg.'[ h \\ A=plitude [ so High k v l M ighl Low ..g _l I >Ks'! Si+ +t-m 1 ~ 2 0 l "I i l 1 i iI.Ii 6 I 1I I I i ' [ 7l Cl.,..l..,l....l....I,,..l...l...,'....i.... ew 3 enb '5@ / 8l l\\ 0 1 2 's 4 s a 7 a s to Esa [m' AMPL. CONTROL LINTARITY al I"itial 6 dB l Result RECORDABLE CCMMENTS/ REASON FOR EXAMINATICN INDICATION MOfp N / AREA INCOMPLETED SCAN (S) . l so -6 Yes No 80 -12 /9 99 40 +6 JPgC/o 20 +12 80% CALIBRATION CHECKS l TIME f l Initial Cal. l/4.* A/ O l f ~' ~ { Intermediate f Intermediate .A..A ll$ 00 ) 8 n, Intermediate ,.l** ~. Final Ca1. ADDITIONAL SHEETS 7 (CHECK BOX) EXAMINERS 1 $ MData PEZfD Level

  • h-Continuation!

? h) / Date 3-2z-E0 Level T Supplementis None g Date [ 'd), .}}

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