ML20076J596
| ML20076J596 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/21/1994 |
| From: | Kaihwa Hsu DUQUESNE LIGHT CO. |
| To: | |
| Shared Package | |
| ML20076J576 | List: |
| References | |
| DC-5882, DC-5882-R, DC-5882-R00, NUDOCS 9410260118 | |
| Download: ML20076J596 (46) | |
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k DC.58t2 Rev 0 g ( o ; Page 3 of 13 p d PURPOSI sL y Tk purpooe of tfus cN*vvi ts to wnfv the structural iraegnty o(Turtune Buikiing pcast The area o(the inde c%ertr:nsd Crane Ceder G2 subrcried to a waspected mtuale arnpact - l t.amage a kvated akmg column ime N and about 4*.10* south of cohnnn hoe 4 i Attachmers A shows the walk down sketches of the damage f x R y
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{ Sance the e6ec e(the web pLste due to a supected trussae impact produces[ only dar sage fkrefore. the scope of tNs DC cmtss onh the structuraj msegnty of Cntdcr G2 i l' METHOD t 1 Cakuiate th< traumum dear foere for Carder G2 bawd on the Crane Wheel Loadmg f. [hasram u shown on Drawing oC7212100 'f 2 Cakulase awrage shear s:reu for the complete section and the damaged accro . f
) Fed the arerw,Me shear stress of the web phte using Tables 136 ard 2 36 ef Ref I'f l
( ( M50 Marual c4 Steel Cor.strucuon. 4.h E6t:cm) i ! Cakulaae uhsmate shear strength of web plate for reference ! 4 ? ) i j s Ig mve te.*g streu of proer unce the damage kutem u far away fiom the m:d span ! c4 the prder tsch produces the resurr:um bending streu o 1 l AS$1'MPT10NS $ [ RF.SI'LT3 AND CONCl.USIONS I Berahng streu (maumurn at the bottom fhnge) a: the damaged crc u sccrion increases onh 4 9 % It a mugrufwant unce the dunage locaten is far away from the prder Msp.m.= .Sch peccxes the maurmm bend:ng streu 2 Shear stress web plate at the damagej cron sectum - t iI Lu W.aMe shear s:rcu of the web plzre - 14 5 Lu OK t 11 n conchaded tbt G:rder G2 n structuraIh adegate a$cr the dsm.spe due to the ' Arn rest ne rnodtfwatien c f Cr.rdcy G2 a twt reqwred ( m.pected : ussde ir put 5 I e 6 I .e , u ~.. I
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TECHNICAL SERVICE REQUEST COVER SHEET fi . TBR. 24545 Rev A Page i ofso
/ N6".a&JARTS: IDElumCATION/DESCRwasDNGalliaMOWwe '
A) Title (Subject): TOR 91rdE B fr A R I A16 E EMM R E PA1 R S B) System PIS Number (s) W30 00 l
- [] ContinuationSheet i l
O Reference Document (s) EnMoM iD. Ti-637 /T 1-441. TI-642. t Ti-34 M T4-27 [] ContinuationSheet A D) Description of Problem / Proposed Solution SG6 cont 100 ATioM SHEET- [] Continuation Sheet B Initiated By Print Name H.saunaeR Extension 6i rq7 Group / Organization N ECM /C 1 Vli_. PiiE Date BN6[H-awaiwa4mW64weFART2: CLASamCATIONswe rgsgMrwrew*w* e A) QA Level [] I [] 1M O Piping []A []B []C M Non-Q B) []I Seismic [] II/ICategory $None Groups []D [] D+ M NA D)ISIComponent B EQ Component F) Technical Syecification Component , , ,
~
[]Yes lJ No [] Yes $d No []Yes N No C) Preliminary Evaluation H) Human Factors Applicability MYes [] No [] Yes h( No I) Simulator Impact J) Training Im pact K) Spare Parts Impact []Yes D(No []Yes P.No [] Yes M No L) Required Action [] Equivalent Part Identification [ j Equivalent Part Installation []TypeIModification [] Type H Modification M TSR Modification [] Setpoint Change [] Configuration Control [] Engineering Evaluation []NA Work Request Pfumber o00 ZM 2/4 84
- M W4s@i@ BRA 4CPARTEDISPOSITIONRhi&MM@&dR&TWMM -
I A) Prepared by y . Extension 61777 i Print Hc6 AutM ER Sign Date F/2s/W i [/ 7 / ] ouMFb4 NA A PART 4: PLANT MANAGER APPROVAL / CLASSIFICATION em " ! [] Approved-At-Risk [] Approved /5 Year Plan [] Approved for Estimate [] Approved toProceed [] Disapproved Sign Date Sign Date pgsgge8MwJsry MNAW PART 5: OSRO APPROVALwHGMi&fRMysub i l Print Sign Date 1 l ARMS - IFORMATION MANAGEMENT
- DSN b68$ Rev DECOM Related
- []Yes KNo at N-M l DTC I1TDTSR MTCTSR _ File 1801.03 Recipient _
42 j i Form FIP-CM141 ATT11/1082793 4 l
f, , TSR DISPOSITION CONTINUATION SHEET TSR 26565 Rev)VA Page 2 offff.o PART 3: DISPOSITION Part 1D) Description of Problem / Proposed Solution: Low pressure turbine bearing beams were inspected after the December 1993 turbine accident. The overall bearing beam structures were found in good condition, with no visual distorbon or warpage on the steel plates forming the large box beam sections. However, there were cracks in four bearing beams, mainly between stiffener plates and T sechons. The locations and detailed descriptions of these findings are described in Sargent & Lundy Report St.AM-02g. (DECO File No. T1-3686) Proposed Disposition: _-s j This TSR is prepared for the repair of these cracks. lollow thefecair DrDCedu(a me ' r atel fis docume.* eribed in theJap4sitien_of this TSRfb A o Ws TsR is n dghe t paaTrepted benGnypaken (No adukena}l w(erk is nee ~ Disposition: ' - - - - - . . - - - _ _ . _ m This TSR modification is prepared for the reoair of cracks found in the bearino b4Aml As. de 'b o File No. T1-3888IW(cnaE t2nyorcemed was 4 gorwed A a s, esco in %i Rev.A ' e$ T$R -24565. g TSR Mod Cracked fillet weld repair and cracked base metal repair will be performed as described in this TSR-26565. For additionalinformation not detailed in this TSR, follow Fermi Welding Manual. Apart from the repair of cracks, a weld design change will be made during the repair. This weld design change will eliminate the wrap around welds between T section and 21/2" thick rib plates. The walkdown data indicates that this weld was completed as a fillet weld and indications point to this location as the starting point of the propagating cracks. This design change will be repeated at four locations per bearing boa eW used A g A & a rep u y ce uaQgsase de in thisb 4=d k fW TSILreflect these.A .${e vyeld
&csTsR. 7 ' G changes.e d h esin Re6 air Process:
The repair steps are described for fillet weld cracks and base metal cracks. Fillet weld cracks:
- 1) Crack Removal o Remove the defects by air cart >on are gouging. The original joint gap or interface should be exposed at the wrap around weld location.
o Verify complete crack removal by magnetic particle (MT) testing. Form FIP-CM1-01 ATT 41/10827g3 File: 1801.03
TSR DISPOSITION CONTINUATION SHEET TSR- 26565 ' Rev FA Page 3 of #2.0 l PART 3: DISPOSITION I Base Metal Cracks: 5 3 1) Crack Removal: Remove the cracks by grinding. Prepare a double V Groove. See Attachment 4 - Sketches, Figure 2, View A-A. If the other side of the base metails not accessible, i i such as the vertical plate nearest generator, the base metal should be ground out to a single V-groove, similar to Figure 2 as described above. A ramp, or slope of 450 maximum should be provided at the ends of cavity. If needed, a backing plate may e be used. The complete base metal crack removal shall be verifed by magnetic I particle testing (MT) ! Weldino Instructions:
- These are applicable both for fillet weld and groove weld (base metal) repairs.
i
- After successful MT, preheat the weld area to 2000 F minimum.
4 j Use E7018 welding electrodes, Size 1/8" or 5/32" diameter. For fillet weld restoration / repair
- maximum weld size per pass is 5/16". For base metal / groove welds, maximum 1/4" weld deposit thickness. Reduce the number of weld passes and stay within the maximum weld
- bead sizes to minimize the distortion and shrinkage stresses. Also balance these stresses by j performing weld passes altemately, from either sides of plates.
As a minimum, perform visual examination after each weld pass. Perform MT after the final l i pass. No linear indications to be present. Use Fermi Welding Manual for additional i information if not specified in this TSR. l Work Request 000Zg44456 was prepared to take samples for fracture surfaca analvele Tx ! t g_sampl1LWpreJent_for_examinaC -tecc:;a%c wedadugic, C Da.?F,1993dutw 4ut eine.
< eacha -@cn dete.tmined the ctach woe cau. sed @$h'sless hirbTDg te pyB-p] [
a t>5Fr6Ead repairs work request 000Z942484 is j i The following TSR pages include the details of each crack found, from DECO File No. T1-
- 3686, Attachments 1 through 4. These cracks shall be repaired as described in this TS l mo ircati n as fillet weld reosir or hmen melallgtDovepeldJepa'ir 46d)I r
a licable I A w ece=<%t a7cever e&dres wig Ec used as d , i l AT N,rew~ 1 Magnetic particle testing (MT) and visual inspections as described in this TSR Modification are the only DCAT requirements. No linear indications are acceptable. (Ref. Fermi Welding Manual) i I Form FIP-CM1-01 ATT 41/1082793 File: 1801.03 } 1 i
TSR DISPOSITION CONTINUATION SHEET 1 TSR- 26565 l Rev 0 I Page 4 of W20 j PART 3: DISPOSITION Rforences:
- 1. Fermi Welding Manual
- 2. DECO File No. T1-3686. Sargent & Lundy Report SLAM-029 i l
- 3. Work Request #000Z944456 ,
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- 4. Work Request #000Z942484 -
g#h 9W7D 2.0, i keA 3 27,Tedad h $ 3 i I i i Form FIP-CM1-01 ATT 41/1082793 File: 1801.03 l
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[] Continuation Sheet C) Affected BCDDs: [] NA ARMS ARMS ARMS i DTC DSN Rev Document Description Remarks , DDVEND R205A1919 K LP Frame Generator End Edison ID T1-637 i Bearing Beam Page 1 of 2 ! DDVEND R205A1926 J LP Frame Steam End Edison ID T1641 1 Bearing Beam Page 3 of 3 DDVEND R205A1929 J LP Frame Center Bearing Edison ID T1-642 Beam Page 3 of 3 l [] Continuation Sheet D) Checked by .[]NA Extension 4-/54_3 i Print _ S o A / SycK Sign __ kd_ Date zs sup y+ , Form FlP-CM1-01 ATT 31/1082793 File: 1801.03 I l
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Attachment 1 - Steam End Bearino Beam ff2 Pedestal) fw,f6
- (g. IOlio Location Fillet Weld Crackina Found Rear, RHS Cracking across T flange weld and about 6" into web weld 1/B and 0/B sides Front RHS Cracking across T flange weld and about 2" ,into web weld 1/B side ,
Rear, LHS Cracking across T flange weld and about 11/2" into web weld on 0/B side ~ and about 4" on 1/8 side Front, LHS Cracking across T flange weld and about 21/2" into web weld 1/8 and 0/8 sides ggg .. Rear - side toward generator (south) Front = north side RHS = right hand side (east) LHS = west 1/8 = in-board (facing towards the center) 0/8 = away from center CHED-058757 6:W CH\RPi\000332CQ.22
. : .' TSR-24%s Attachment 2 - Center Bearino Beame (#3 & #4 Pedestals) A. Pedestal #3 Location Fillet Weld Crackina Found Rear, RRS Cracking across T Mange weld and about l' into web weld on 1/B side and about l' on 0/8 side ,
~
Front RHS Cracking across T Cange weld and about 3" in[o web weld on 1/B side and about l' on 0/B side Rear, LMS Cracking across T Mange weld and about l' into web weld on 1/B and about 4" on 0/B side Front, LHS Cracking across T M ange weld and about l' into web weld . . , both sides 1/B and 0/B B. Pedestal #4 Location Fillet Weld Crackina Found Rear, RHS Cracking across T M ange Front, RHS Same as above Rear, LHS Cracking across Y M ange weld and about l' into web weld on0/0 side Front LH1 Same as above
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CHED-058757 6: W CH\ APT \000332CQ.tt
- TSR-2G65 Attachment 3 - Generator End Bearina Beam (#5 Pedestal) gg I' f') ' I 2-/20 i
l Location Wald and Base Metal Crackina Found
~
Front, LHS Cracking across T flange fillet weld and about 3" into web fillet weld then branching into base metal of web for about 8' on 1/8 and 0/8 sides Front RHS Cracking across T flange fillet weld and about 3" into web fillet weld then branching' into web base metal for about 10' on 1/B and 0/8 sides O Rear, LHS Cracking across T flange fillet weld and about 6" into web fillet weld on 1/8 and 0/B sides i Rear, RHS Same as above Vertical Plate In the southwest upper corner cracking about 2' Nearest Generator at toe of weld branching into plate base metal (adjacenttothe for about 2' i l aboveitem) -- __
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- 45 max. elope j to surface FICURE 2 - Cavity Configuration on T-veh Bepe Metal
TSR-26565 Rev.O Page 14 of $8'ZO i PRELIMINARY EVALUATION 4 Page 1 of 2 ( PART1: DESCRIPTION OFCHANGE(Propster) B) Revisionif Approved C) PIS Number A) Documentidentification #3000 l TSR-25565 0 D) Description of Change l Low pressure turbine bearing beams are repaired to re. establish their original structural strength. In I addition,a typleal wrap around weld is eliminated. This weld is believed to have been the starting point of the existing cracks. The majority of the repairs are at the same detaillocation, four per bearing beam, with four bearing beams involved, for a total of 16 similar repairs. (continued on page 2) PART2: PRELinflNARYEVALUATION(Preparar, Approver) A) Review of Commitments [X) No commitments [] Commitments Exist (Identify in accordance with 6.1.4.5) [] Commitments Met none negated [ } Commitments need changing - Describe and justify commitment changes on continuation sheet' ' [ } Safety Engineering and/or Nuclear Licensing have been contacted to make changes B) Impact on License, Plans, or Programs [ Check box (es) if no impact) ' No No No I impact impact impact Offsite Dose Calculation l Operating License "X) Quality Assurance [X) [X) Manual (ODCM) Program l [X] Technical Specifications Radiological Emergency [X) Process Control Program ; (including Bases) [X) ! Environmental Protection Response Preparedness (PCP) [X) Inservice inspection - Plan Plan (RERP) [X) Physical Security Plan Inservice Testing Program i [X) Core Operating Limits [X) Safeguards Contingency (ISI IST) l Report (COLR) [X) Plan [X ) Inservice inspection - ; [X) UFSAR Fire Protection Program [X) Security PersonnelTraining Non-Destructive [X) Examination (IS!-NDE) and Qualification Plan [] License Change Request (LCR) required List LCR(s): C) Effect on Environment [X) No effect on environment [] Environment affected - contact Fermi Environmental Engineer and indicate resolution D) Need for Safety Evaluation (check appropriate answer) Safety Evaluation No. (if required) ! l Yes No I [] [X) 1. Is this a change to the fac!!ity, including assumptions, as described in the UFSAR?
- 2. Is this a change to a procedure, including assumptions, as described in the UFSAR7
[} [X) [] [X) 3. Does this change constitute a SpecialTest?
- If any answers are "yes" and the NRC Safety Evaluation Report is available, attach NRC Safety Evaluation.
- If any answers are "yes* and no NRC Safety Evaluation Report is availabte, initiate a Safety Evaluation.
- If all answers are "no", providp the.basifJo support that determination on a continuation sheet.
v
- 6) Prepared by H.Sahlvg F)
[/ File: 0923.02 Form FIP-SRI-01 Att 1 P1/1051794
s - i " TSR-26565
- Rev.0 ,
Page 15 of.Hr20 PRELIMINARY EVALUATION CONTINUATION SHEET i i Page 2 of 2 B) Revisionif Approved A) Documentidentification i TSR-26565 0 - Part 1D) Description of Change (continued) 1 l The eliminated wraparound welds will relieve stresses at locations where fillet welds from each sides j of the webs of T sections end. In addition, the filletweld and base metal cracks will be ground, prepared and rewelded. The final configurapon will be at least as strong as the original condition. l 20) Need for Safety Evaluation
- 1) This modification is not a change to the facility. The bearing beam weld details are not described in the UFSAR. The structural repairs performed do not impact the UFSAR or its assumptions.
- 2) This modification does not change any procedure, including assumptions, as described in the '
UFSAR. i.
- 3) No testing is impacted. This change is mainly structural. It does not constitute a Special Test.
l As all the answers the above questions are negative, a Safety Evaluation is not required. The l j subject TSR modification will repair and improve the bearing beam structure, which had been impacted from the December 93 turbine accident. l l i i 1 l i 1 ( i 4 i
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File: 0923.02 Form FIP-SR101 Att 2 P1/1051794 j
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- In December 1993, the Fersi turbine sustained damage inelodt loss of blades. A walkdown of the low pressure turbine bearing benaz
} was requested by Mr. A. Alchalabt of Detroit Edtson Coopatur to ascess j
! any possible structural damage. Also, possible explanations should be 1
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- II- Walkem Results 1 -
l- , j The walkdown was performed by Jim Louden on 04-18 and 04 19-94. l l The walkdown consisted of visual examination of the four turbine l -- bearing beams each about 15 ft. high and almost 35 ft. long. There
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-- was no distortion or warpage "not h o~n these large box beams. However, f there were a number of locations where cracking was found and these j are iteelzed in Attachments I to 3. A vertical plate in the #5 pedestal area adjacent to the generator foundation had a weld crack l' that also branched off into the plate base metal (see Attachment 3, last item). All other cracking was relatpd to the fillet welds joining the 2 1/2" thick support ribs to the T's which were about 3/4" thick.
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I After the feral turbine lost some blades the imbalance probably
- j. resulted in high stress fatigue load!' ofs the aring beams at a rate I .* .
equivalent to its rotational speed, rpe. t is possible that the ! cause of the cracking was high stress-low cycle fatigue. Detroit
.i j Edison Company should be able to deteNiine if the cause a'sracking is a . .
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metal and base metal areas and sending them to a metallurgifal laboratory with Scaniing Electron Microscope (SEM) equipment to perfore a t'racture surface examination.
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If it is confirmed that fatigue is the cause of cracking, an explanation of why all (except one case) cracks occurred at the support rib to T welds should be determined. These stiffeners are f centrally located under the turbine. Also, there is a thickness transition free 21/2* to 3/4* (see Fig. I of Attachment 4) which j represents a stress riser. It this joint was required to be designed for fatigue, the 2 1/2" thick piece would have a 2.5 to I slope to blend in with the fillet welds as shown by the dashed lines on Figure
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- - - l. Another stress riser was present,because the support rib to the web of the T weld was wra,, ped around the T flange edge to connect with j
'I the T flange weld. It should be noted that all the fillet welds that continued around the T flange edge were cracked the entire length.
j The AWS D1.1 " Structural Welding Me* states that " fillet welds deposited on opposite sides of a cc, anon plane of contact between two ; j i parts shall be interrupted at a corner common to both welds.' 'When e
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- The support rib to T flange weld is shown by the drawings to be a j partial penetration groove weld beveled'to a depth of 3/4" on the T f j fl ange. Except for the #2 Pedestal, Rear RHS and LMS where the welds I were flush, the support rib surface ext 5nded beyond the T flange and ,
1 2 l only fillet welds could be discerned. 7 _
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! Materials - The English Electric Ltd. drawings for the . turbine
! structurals show that the base metals used are either grade 40A or 43A ) i l per British Spec. (85) 4360. The " Worldwide Guide to Equivalent } Irons & Steels.' 2nd Edition published by ASM Interr.ational gives typ' cal chemical compositions and tensile properties for both of these li grades. They are comparable to the ASTM A36 structural material j consoonly used in the USA in terms of strength and weldability. ,
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inerefore, an AWS A5.1 classification E7018 electrode would be an f j appropriate shielded metal an: welding (SMAW) for repair welding. I f Crack Removal The most efficient method for defect removal is air carbon are gouging. This method should be acceptable for removal of l most of the fillet weld cracking found. Removal of any crack surfaces j for metallurgical examination should be by grinding and/or cutting ! wheels. Magnette particle (MT) or liquid penetrant (PT) testing f should be used to verify complete crack removal. The base metal . j cracked areas in the web of the T should be ground (or s'amples cut) 4 l for the length of the crack so that the resulting cavity is a double j Y grove (i.e. each side of the web to a depth 1/2 th,1ckness) with an l Included angle of at least 60'. A ramp or slope of ~about 45'saxt: sus , l should be provided at the ends of the cavity (see Fig.,2, Attachment i 4). The base metal crack in the plate abutting the generator i j foundation wall should be ground out.to a single V-groove configuration with the angle'and ramp a~s stated above. If the crack i 1 goes thru-wall, consideration should be',given to positioning a backing
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The fillet welds that wrapped a with the T flange welds should be removed entirely. The original 1 joint gap or interface should be exposed. This area must not be j rewelded (i.e.,thewebfilletweldmustnotbeconnectiedwiththe 1^ flange fillet weld). l 4 0 Weldino Instructions - Weld repair instructions for the excavated 1 7 ) cavities are as follows:
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l Preheat: Preheat the weld area to 200*F minimum. l Electrodes: E7018. 1/8' and/or 5/32" diameter ' 7 Maximus Weld Size per Pass: 1 Fillet Weld Restoration - 5/16" Groove Welds - 1/4" weld deposit thickness 1 l Reducing the number of weld passes while staying within the maximum weld bead sizes given above should mintalze the distortion and shrinkage stresses. Also, to balance the weld shrinkage stresses , welding on the opposite side should be performed alternately whenever e possible (e.g., after a weld pass in an in-board side cavity' the next pass would be in the out board side cavity). $ ,
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Insoection - The root pass of each repaikwel' d should be visually , examined to verify that no cracks or fus, ion defects exist.,:I , e
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Attach + ment '3 - Cenerator End Bearino Beam ff5 Pedestall
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Front RHS Cracking across T flange fillet wid and about 3" into' web . l ~ i fillet weld then branching into web tase metal for about J
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I I Rear, LHS Cracking across T flange fillet weld and about 6" into web i
**'t r fillet weld on 1/B and 0/8 sides ] Rear, RHS Same as above i a 1
- M l Vertical Plate in the southwest upper corner cracking about 2" -! R
- Nearest Generator at toe of weld branching into plate base metal -
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b . Deholt Edison . Technical and Engineering Services Date: June 21.1994 g.;g .yq V 70 2D To: A.S. Young -- p From: D. J. Connell
Subject:
Metallurgical Evaluauon of Bearing Pedestal Box Beam Weld Cracking, i Fermi 2 l Technical & Engincedna Services Reoort 94V70-20 Following visual inspection of the bearing pedestal box beams by DECO structural engineers and Sargent & Lundy engineers, ten samples were removed from cracked welds. ne samples were sent to TES for metallurgical analysis. Table I lists the location of each sample, as recorded from the field notes. Due to the condition of most of the weld samples, only limited metallographic and electron microscopy (SEM) was done. Sample 1 was the only sample which clearly showed service related fracture. De sample had been taken from a crack that had propagated out of the weld into base metal, a structural tee in the No. 5 pedestal bearing beam. From this sample a metallographic mount was prepared and the fracture surface was examined in the SEM. Two other samples were examined in the SEM, numbers 5 and 6. Only visual exam was performed on the remaining samples. Results Table Il reports the results of the visual examination. Little useful information was obtained from these samples due to the poor welding. In samples 4 and 9 plastic deformation (of the steel) and cracking in the paint is reported. This indicates that the ! stresses that caused cracking were very high. De fracture surface of Sample 1 was heavily smeared so no fracture features were identifiable. Deformation of the crack surface is further evidence that extremely high alternating stresses were present. Examination of Sample 5 in the SEM was the first direct evidence of high stress-low cycle fatigue. Figure I shows the fracture surface at relatively low magnificaUon, approximately 47X. At this magnification fatigue striations can be clearly observed. In figure 2 the boxed area is magnified 10X on the right. nts shows that ductile tearing has occurred within each fatigue cycle. His magnitude of cycIlc stress is rarely observed in engineered structures. Conclusions ne cracking found in the bearing pedestal box beams was caused during the December 25,1993 turbine failure, ne cracking is high stress-low cycle fatigue. Although all the samples taken in weld metal revealed very poor welding, the overall structure was adequate for normal operation. I
\ 94V70-20 Page 2 All cracks should be nmoved and those areas rewelded. Although the quality of the welding in the beams is suspect based on the samples taken. I do not neommend replacement of weld beyond that required to repair the cracks. Approved by-
. Black pervisor etallurgy NDE & Welding m: P. R. Tracy L. C. Fron "'
G. J. Mcdonald G. A. Horuczi(file) Reports:94V70 20 l i l
l - 94V70-20
- Page 3 f
Table I Sample Location Sample No. Sample location 1 #5 pedestal. O/B side NE., WS 2 #5 pedestal. O/B side, SE corner, RHS 3 #5 pedestal I/B side, NW, RHS 4 #5 pedestal, rear, SE comer, WS 5 #4 pedestal. O/B, NE side 6 #4 pedestal.1/B, SE corner 7 #3 pedestal, WS, NE 8 #3 pedestal, SW nar. I/S 9 #2 pedestal, WS, front, NW corner 10 #2 pedestal, WS, rear, O/B, SE comer Note: The sample location is listed as recorded from the field notes , , , Table II Results of Visual Examination of Crack Samples Sample No. Description 1 Base metal, looks fresh, fracture overheated dunng removal 2 Shallow crack and Noody" fractum; paint shows cracks 3 Weld around comer: very poor weld; massive porouy & slag pockets . 4 Weld around corner; considerable plastic deformation around cracking: cracks in paint; very rough & poor weld, slag, porosity 5 Sample had to be opened up; looks like sample came from where a weld ended at a corner; poor weld 6 Crack had to be opened up; porosity & shrinkage 7 Massive porosity; slag 8 Slag and massive porosity; lack of fusion 9 Considerable cracking in paint; poor, shallow welding: porosity and slag 10 Large pocket where weld bridged
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