ML20207P203
| ML20207P203 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 10/31/1986 |
| From: | Gordon B, Ishuzaka E, Sayre E GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20207P192 | List: |
| References | |
| PMA86-07, PMA86-7, NUDOCS 8701150228 | |
| Download: ML20207P203 (187) | |
Text
.
PMA86-07 1
O PLANT MATERIALS APPLICATION ENGINEERING Pilgrim Nuclear Power Station Recirculation Inlet Thermal
- Sleeve Mock Up Fabrication And Evaluation October 1986
- J Prepared by
- [ u I E. T. Ishizaka, Principal Engineer Plant Materials Application Reviewed by: 4//lv hdt B. M. Gordon, Principal Engineer Plant Materials Technology Approved by: 'Mu E. D. Safre,//hanager Plant Matekials Application l
NOTICE Neither the General Electric Company nor any of the contributors to this document makes any warranty or representation (express or implied) with respect to the accuracy, completeness, er usefulness of the information \
' contained in this document, or that the use of such information may not infringe privately owned rights; nor do they assume any responsibility for liability or damage of any kind which may result from the use of any of the information contained in this document.
DISTRIBUTION 8701150228 870102 '
O IMPORTANT NOTICE REGARDING CONTENTS OF THIS REPORT PLEASE READ CAREFULLY O
I The only undertakings of General Electric Company (CE) respecting information in this document cre evntained in the agreement between Boston Edison Company (BECo) and GE (P.O. 63499) and nothing contained in this document shall be construed as changing the agreement. The use of this -
. information for any purpose other than that for which it is intended, is not authorized; and with respect to any unauthorized use GE makes no r representation or warranty (express or implied), with respect to the t
completeness, accuracy, or usefulness of the information contained in this document, or that the use of such information may not infringe privately owned rights, nor does GE assume any responsibility for liability or damage of any kind which may result from the use of any of the information contained in this document.
J
}
1
l Contents 1
1.0 Introduction and Background 3
2.0 Summary 3.0 Initial Thermal Sleeve Field Assembly I ~
4.0 Mock Up ~
4.1 Mock Up Fabrication 4.2 Mock Up Assembly o 5.0 Mock Up Evaluation 5.1 Residual Stress Measurement 5.2 Sensitization evaluation
. 5.3 Temperature measurements 6.0 Discussion of Pilgrim Field Thermal Sleeve Cracks 7.0 Conclusions J 8.0 References I I e
3 O
1
O Appendices 1
A GE Drawings 197R587, 729E980, 158B8575 B GE Installation Specification 22A2234AB, Section 7 O
C GE Drawing E232-345, E232-358, E232-369 D Pilgrim as built data D-1 Weld and P.T. of OTS to Nozzle D-2 ITS Fit Up Measurements
OTS End Shrinkage Measurements D-4
- D-5 Jet Pump Riser to ITS Weld P.T.
D-6 Fit Up and P.T. Acceptance of OTS to Nozzle Weld D-7 Jet Pump Riser to ITS Fit Up and Weld 1(r . E Electrochemical Potentiokenetic Reactivation (EPR) measurement of sensitization F Measurement of residual stress by the hole drilling technique G- OTS thermal cycle charts H Certified Materials Test Report
- H-1 OTS Mock Up Material
)
H-2 Carbon Verification of H-1 H-2 Original Pilgrim OTS Material I Bechtel Weld Procedure P8-T-AG J Pilgrim Thermal Sleeve P.T. and R.T. Cracking Map K Mock Up Fabrication Photographs -
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(. 1.0 Introduction and Background 1
Background
D Boston Edison Company (BECO) replaced the original type 304 stainless steel dryvell piping and the reactor pressure vessel (RPV) recirculation inlet (N-2) and outlet (N-1) safe ends at Pilgrim Nuclear power station in 1984.
During the safe end replacement work, isolated cracking was discovered on the outside diameter (0.D.) of the N-2 outer thermal sleeves (OTS). The N-1 nozzles do not contain thermal sleeves. A cross section of the Pilgrim N-2 s nozzle and thermal sleeve assembly is shown in figure 1-1. The cracks were located predominately on the 2" wide band formed by the OTS fillet veld end,
- and intersection of the machined 0.D. and machined chamfer. A few isolated 1 circumferential cracks were also found further back on the machined area.
Appendix J shows sketches of the individual crack location on each nozzle.
I The cracks were left in place because they were discovered late in the outage when replacement was not practical and because the thermal sleeves were otherwise sound. This decision was supported by General Electric evaluations
) on the structural integrity and crack growth as well as Boston Edison's plan to implement Hydrogen Water Chemistry which would mitigate IGSCC. General Electric also performed analysis to determine the residual stresses resulting for the weld between the OTS and inner thermal sleeve (ITS) which showed the presence of high axial tension stresses on the OTS 0.D. This. combined with the expected O.D. weld sensitization would explain the observ d cracking as 4,Q IGSCC. Additional information on this work is contained in Ref. I.
V I 5 1
O Subsequent to the issuance of Ref. 1, the Nuclear Regulatory Commission questioned the reported cracking mechanism. In response to this question.
BECO requested GE to fabricate a Pilgrim N-2 nozzle and thermal sleeve mock up which would simulate the configuration, material and assembly procedures as much as practical and to evaluate the mock up for the presence of conditions conducive to IGSCC in areas where cracking was noted at Pilgrim.
l This report contains the details of the fabrication and evaluation of this mock up program.
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O I Figure 1-1 Cross- section of Pilgrim Recirculation Inlet Thermal Sleeve / Nozzle at Alignment Fad Locations 1 7
2.0 Summary It is concluded from the results of this program that all of the cracks noted on the Pilgrim N-2 thermal sleeves occur in areas conducive to IGSCC.
O A mock up of the Pilgrim recirculation inlet nozzle (N-2) and thermal sleeve with a simulated jet pump riser was f abricated' and assembled closely simulating the actual configuration, material and original installation methods. ' -
- During the pertinent fillet welding of the ITS to the OTS, the OTS outside diameter temperature was monitored in the areas where cracking D occurred at Pilgrim. Upon completion of the mock up, Electrochemical
. id Potentiokenetic Reactivation (EPR) readings were taken on the OTS in the same area. Meta 11ographic examination of this area and experimental residual stress measurements by the blind hole drilling technique were also taken.
The EPR readings indicate that isolated areas up to 11" from the OTS
- welded end show sensitization considered in the severe range and areas up to O
ll" show sensitization considered to be in the moderate range. Most measured I
l areas within }" of the end showed moderate to severe sensitization.
Metallographic examination of the area confirmed the presence of surface grain boundry carbides up to approximately ll" from the outer tube welded end. The outside diameter temperatures measured during welding indicate that the time l
l at temperature beyond }" from the end of the OTS was not in the, range O
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normally censidered to be sensitizing for the carbon level of this material
(.062%). It is theorized, however, that alternate straining and heating cycles seen by the outer tube material during the welding operation accelerated the sensitization.
D I An evaluation of the individual cracks reported on the Pilgrim N-2 thermal sleeves, based on results of this mock up and field experience B
concludes that conditions conducive to IGSCC could have been present at all I locations. Many of the cracks occurred around the 0.D. weld pads. This area -
is sensitized by the pad welding and also has high residual stresses from the
- combination of weld shrinkage from the pad weld and the thermal sleeve to thermal sleeve weld. The circumferential cracks that occur within the first QJ 11" wide band from the end of the thermal sleeve and away from the weld pads are within the sensitized area measured on the mock up and are also within the l
area of high measured axial tensile stresses. There were no axially oriented cracks in this area. The remaining cracks are located further back from the end of the tube in areas which probably have very limited sensitization. They are located away from the weld pad, are circumferentially oriented and are
- generally quite shallow, based on a comparison of L.P. test results to
' radiographic test results and they all occur on machined surfaces. These cracks occur in areas conducive to IGSCC due to the combination of shallow machining surface cold worked, possibly limited sensitization, and high 0.D.
axial tensile stresses from the thermal sleeve fillet veld. There have been many confirmed cases for cold worked surfaces of cracking in BWR service.
? .
These cracks have been shown to extend only to the depth of sttrfac.e cold work o and, if still active, should be mitigated by hydrogen water chemistry (HWC).
Q I 9 D
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( i l V) 3.0 Initial Thermal Sleeve Field Assembly The N-2 inner and outer thermal sleeves and the jet pump riser assembly iIh are sent unassembled to the field for installation. The installation of these components was accomplished in accordance to GE dwg 197R587 and GE installation specification 22A2234AB Section 7, shown in Appendix B. A sketch showing the assembly is presented in figure 3-1.
A The initial operation was to weld the OTS, CE dwg E232-358-01 to a
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stainless steel weld build up pad in the N-2 nozzle bore as shown in GE dwg 197R587. The ITS, CE dwg E232-358-02, was then trimmed to length to provide proper alignment of the jet pump riser (CE dwg 729E980). The orfginal trim eq 1ength for the Pilgrim installation is shown in appendix D.
,O The jet pump riser was then welded to the ITS (the ITS is not engaged in the nozzle at this time) and this assembly inserted into the OTS and fit up as required by GE dwg 197R587. The original ITS to OTS fit up is shown in appendix D. The two concentric thermal sleeves were then welded by a fillet
- weld with Bechtel Procedure P8-T-AG. This fillet weld caused significant
'3 distortion at the end of the OTS as illustrated shown in Table 4-1. The actual measured distortion of the original Pilgrim installation is shown in appendix D.
Subsequent assembly consists of welding the jet pump riser brace to the j .
reactor pressure vessel wall and the assembly of the jet pumps;. These operations do not affect the metallurgical condition or significantly affect the residual assembly stresses existing at the OTS to ITS weld joint.
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A ii rV 4.0 Mock Up 4.1 Mock Up Fabrication A mock up was fabricated and assembled simulating the actual plant installation as much as practical. Compenents and operations which would l
I affect the metallurgical condition and assembly residual stresses on the outside diameter of the OTS where cracks were found at Pilgrim were duplicated to the maximum extent feasible. '
l E The RPV nozzle was simulated by a mock up shown in sketch 4-1. The areas of importance on this mock up were the attachment of the OTS to the nozzle bore and the potential contact area between the OTS weld pads and the safe end I.D. (.037" min. clearance). These locations were accurately reproduced in
(/ The remaining structure was designed to rigidly support the the mock up.
other mock up components during assembly.
3 The OTS was fabricated to duplicate the original as shown in sketch 4-2.
I The base material was ASME/ ASTM SA-312, TP304, 10" sched 80S pipe, heat
- 3291364, with a carbon content of .06% by mill certification and .062% by an independent verification. The carbon content of the Pilgrim OTS's as reported by mill cert, was .062%.
4 The ITS was fabricated from ASTM A356, TP304, 10" sched 140 pipe as shown sketch 4-3. The critical dimensions for the fit up to the outer thermal cleeve wac held to original dimensions. The length of the sie ve,was IO determined based on the average trim length of the Pilgrim thermal sleeves.
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Io The jet pump riser was c1mulated by the elbow assembly shown in sketch 4-4 welded to the ITS. The elbow was fabricated ASTM A403, TP304, sched 40S short radius elbow. The remainder of the jet pump riser assembly was simulated by a centralized dead weight equal in weight to the missing riser 3
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The only effect of the missing jet pump parts during the assembly of the thermal sleeves is that they provide additional weight which must be supported and the upper portion of the riser is used as a support point. Both of these were simulated by the dead weight which had supports welded on the top end-4 ,
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EV t 4.2 Mock Up Asse.nbly The OTS was instrumented with thermocouples as detailed in section 5.3 and stamped with azmuth marks and shrinkage measurements points on the free end. The OTS was then inserted into the nozzle mock up to provide 5/8" overlap on the simulated weld build up pad on the nozzle mock up, centered in the simulated safe end, and welded to the nozzle bore while maintaining alignment at the safe end. The clearance between the OTS pads and safe end was maintained without difficulty. The OTS was installed with the 315* azmuth at top dead center to position the weld pads at field installed locations of -
1 approximately 45* off center.
Iq Following the field installation sequence as indicated in 22A2234AB, the simulated ITS and jet pump riser assembly was inserted into the OTS and positioned to leave 1 5/23" of the OTS r cgaged for the required fillet veld.
This dimension was the average of the field installed dimension. The weight
.O of the jet pump assembly was simulated by heavy wall pipe sections welded to the carbon steel plate on the riser elbow. The assembly was supported by an
_ overhead crane through the vertical center line of the riser elbow to simulate the actual field support. The OTS and ITS were tack welded together and dial indicators were placed between the ITS and the nozzle nock up to monitor movement. Dial indicators were also placed between the nozzle mock up and the shop floor to assure that no unplanned movement occurred between the mock up and the support crane. No movement between the crane and mock-up was noted during subsequent assembly. ,.
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{ The fillet weld between the OTS and ITS was made using the original Bechtel weld procedure WPS P8-T-AG, revision 6 shown in Appendix I. 18 layers I
L were required to complete the weld. The weld single bead sequence was essentially as shown in figure 4-1 with staggered starts and stops. This sequence was selected by the welder based on ease of application. It was
[ intended to change the sequence, if necessary, to maintain alignment between L_.,
the nozzle and ITS during welding. However, no alignment corrections were required and the same sequence was used throughout the complete welding. The final welded location of the ITS to the nozzle mock up was within 0.040" of the original tacked location. The gap between the OTS pad and the simulated safe end I.D. was monitored and no contact between the two surfaces were noted
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during or after velding.
l lv The final shrinkage at the end of the OTS is presented in table 4-1. The average diametrical shrinkage was .418" (.209" on radius). This is somewhat j less than the shrinkage noted during the original installation which varied between .336" and .242" with an average of .276" on the radius. This is l probably reflective of the variation in weldor technique within a given weld
_ procedure.
k I The temperature of the OTS outside diameter was also measured during the OTS to ITS welding. The results are presented in section 5.3.
Upon completion of the welding, the ITS/0TS and the attachment veld was removed intact from the mock up by a guillotine cut 11" from the welded end for O
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subsequent evaluation.
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DIAMETER AFTER WELDING qo BEFORE WELDING AFTER WELDING FINAL SHRINKAGE AZMUTH 00 10.371" 9.960" 411" 10.352" 9.867" 485"
-450 90 10.361" 10.021" .340" 10.286" 9.850" 436" 1350
.- AVE = .418" J WELD SHRINKAGE AT OTS WELD END TABLE 4-1 .
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lt is judged that this mock up duplicated the part configuration, L
material carbon level, assembly sequence and restraint as seen by the Pilgrim I
L thermal sleeves during initial installation as it relates to the OTS.
5.0 Mock Up Evaluation I
L 5.1 Residual stress measurement c
After the selded thermal sleeve assembly was removed from the mock
[
up, residual stress measurements were taken on the OTS 0.D. The blind hole drilling technique as specified in ASTM E837 was utilized. This
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method involves attaching a strain gage rosette to the surface location to be measured, drilling a hole at the center of the gage into the O material, and measuring the relieved strain. The measured strains are then related to the relieved principal stresses through the equations in ASTM E837. The hole was drilled using a optically aligned high speed
(
drill. The diameter af the drill was 0.080" and the depth of this hole in slight excess of this, therefore, the reported values are surface oriented stresses. The details of the test procedure and reduction of data are presented in appendix F.
The measurements were taken at 135' and 315* azimuths and at axial distances from the weld end of the OTS as shown in figure 5-1. The measured stresses and maximum stress orientation are shown in table 5-1 and presented in figure 5-2 as measured axial and circumferen'tial O
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' The results show relatively high axial tensile stresses present at both azmuth locations for an axial length beyond the machined chamfer on the OTS. This machined chamfer is located 2" away from the welded end.
The circumferential stresses are high compressive to low tensile.
O I The results show that the analytical results (Ref. 1) are in general, consistent with the experimental reaults. It should be noted that experimental measurements of piping have shown significant I variations of residual stress behavior around the circumference of the pipe due to manual welding variables. As the areas measured represents e only a small sampling of the total circumference, there are potentially other locations with significantly higher residual stresses. The p observed field cracking supports this premis as they occurred in isolated 1V areas around the circumference.
I It appears conclusive from tett results that areas on the 0.D. of
- the OTS have sufficient axial tensile stresses up to and beyond the machined chamfer to be conducive to ICSCC.
. 26 ; .
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'd 5.2 Sensitization Evaluation Electrochemical potentiokinetic reactivation (EFR) readings were taken on the OTS outside diameter on the fillet weld end. The testing was performed using the double loop reactivation method as described in Ref. 2. This method was used over the single loop method because the surface preparation for the readings are noc critical and the metallographic grain size determination of the area measured is not required. As a result, improved reliability and accuracy are reported for this method compared to the single loop method.
presentation of the test description, and test method used for this evaluation and correlation of the test results by this method to the results of the older ls conventional single loop method is presented in appendix E.
n Iv The results of the EPR measurements are expressed in the ratio of the reactivation current to the activation current rI /Ia . For I /I ratios less r a than 0.01, the material is considered not sensitized and therefore has a very low susceptibility to SCC. For materials with ratios between 0.01 and 0.1, the SCC susceptibility is considered low to moderate and if the ratio is above
- 0.1 the material is considered to have high susceptibility to SCC.
I ERR readings were originally taken around the 0.D. circumference of the OTS 1" back from the welded end. Readings could not be taken adjacent to the 0.D. weld buildup pads due to the construction of the probe which requires an annular area around the active element of the probe to be free of sharp protrusions. The results are presented in table 5-2 and shows;significant i variations in EPR ratios around the circumference. The EPR readings taken on the base material well away from the weld show ratio values nominally .005 with no readings greater than .01.
27
lIo Azmuth' EPR Azmuth 0 EPR (Approx) Ratios (Approx) Ratios 12 .134 weld pad .
15 .020 195 .025 22 .007 200 .048 30 .007 205 .003 40 .007 210 .006 45 .018 220 ,
.008 46 .008 335 .017 52 .033 230 .014 60
.033 230 .014 60 .080 235 .010 67 .037 240 .,
.009 75 .031 245 .004 -
80 .023 252 ,- .003 ,
.012 weld pad 262 ,
98 .029 weld pad 100 .005 279 .018 l - 107 .007 282 .013 115 .011 288 .106 120 .041 295 .075 125 .042 303 .143 145 .006 308 .146 150 .012 318 .013 155 .046 325 .049 160 .032 330 .069 165 .088 335 .049 170 .038 345 .008 175 .044 350 .073 weld pad EPR RATIOS TAKEN ON OTS OD 1" BACK FROM WEI.D END 3 Table 5-2 I
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Circumferential areas showing moderate to high ratio EPR readings were selected for additional axially oriented readings. The results of these I
L readings, taken at 1" internals from the weld end, are presented in figure 5-3.
{ These measurements show that the welaing has significant localized effect on the EPR readings. The 225' azmuth readings indicate that the material has high susceptibility to IGSCC up to a distance of 11" from the end and low to moderate susceptibility up to a distance of 11". The 306* azmuth show high susceptibility up to 3/4" and low to moderate susceptibility up to 11". ~
j- Measurements taken around the circumference at a distance 1" back from the end also shows a number of localized areas within the high to low susceptibility (A range.
L) l The wide scatter found in the EPR readings can be attributed to the i variation in local weld heat input from manual welding and to local microstructural and chemical variations. The presence of 0.D. sensitization was confirmed by random metallurgical cross sections of the welded thermal sleeve assembly. The metallurgical sections were polished, electrolytically etched with oxalic acid and examined for the presence of grain boundry carbides. Most of the sections showed moderate to heavy grain boundry carbide I precipitation up to 5/8" from the end. A section taken at 300* azmuth showed heavy to moderate sensitization up to 7/8" and evidence of some carbide precipitation judged to be in the moderate to low range of sensitization up to s ,
and beyond ll". Figures 5-4 through 5-7 shows the microstructmre.with various
/m degrees of carbide precipitation along the 0.D. Figure 5-8 shows a section (a) through an azmuth which shows no carbide precipitation.
29 1
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, 1 1/2 .005 ca B
1 1/4 .005. .010 .0374 .018 .015 3
h1 .008 .011 .126 .002 .'050 .017 .
E - -
N 3/4 .005 .007 .193 .011 .175 .019 -
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. g
,, g g 1/2 .037 .076 .287 .012 .288 .015 I 5 1/4 .028 .262 .139 .179 .424 .032 O
45* 100* 225* 285* 305* 320*
I APPROXIMATE AZMUTH
- (NOT SCALED)
EPR RATIOS VS DISTANCE FROM OTS
- WELD END FOR VARIOUS AZMUTHS 3
l FIGURE 5-3 3
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, FIGURE 5-4 PHOTOMAC.ROGRAPH OF MOCKUP CROSS
! SECTION. MAGNIFICATION %1.7. OXALIC ACID ETCH.
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, x Q ; g.b g y_4 Q FIGURE 5-5 0.D. SURFACE OF OTS N 15" FROM WELD END. ' OXALIC ACID ETCll. 400X 31
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FIGURE 5-6 0.D. SURFACE OF OTS N 1" FROM WELD ,
END. OXALIC ACID ETCil. 400X L
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.END. OXALIC ACID.EICll. 400X o l l
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10 t FIGURE 5-8 0.D. SURFACE OF OTS IN UNSENSITIZED AREA. OXALIC ACID ETCll. 400X O
i -
J 4o 1 33 a
o) y The metallographic examination confirms the EPR ratios which indicate areas of low to severe sensitization exist for a significant distance from the weld end on the OTS 0.D. Based on the limited ability to examine the total surface for sensitization, it is expected that local areas further from the E weld end may also be sensitized.
5.3 Outer Thermal Sleeve Temperature Measurement The OTS was instrumented with chromel alumel thermocouples (TC) at 90* -
intervals around the outside circumference starting from'45' at distances 1/27 I and 2 inches from the weld end. The TC were spot welded directly on the surface of the sleeve to provide maximum response and accuracy. The identification of the TC are shown in figure 5-9. The temperature profiles
/7
'O obtained during the welding of the OTS to ITS are presented in appendix G.
This data was analyzed to determine the degree of sensitization that could be expected from the temperatures attained during welding. This data was characterized by determining the total time spent in certain temperature
)
I intervals in the sensitizing range. This approach assumes that the sensitization vith time at temperature is additive which is the case if any intermediate temperature excursion does not exceed the carbide solutioning temperature which was true in this case.
A summary of the time at temperature data is presented in table 5-2. A typical time, tenperature, sensitization (TTS) diagram for the* initiation of grain boundry precipitation in a 0.05% carbon 304 stainless steel'is shown in iO figure 5-10. The time temperature data for TC no. 1, located 1/2" from the 34 1
IO 1
J I '
= 2" ;
e l" *
- 1/2" *
' l'N'N'x'N'Nx'NN'NN' .
V////, J .-
4-AZMUTH DISTANCE FROM END 1/2" 1" 2" T.C. NUMBER" 45o 4 5 6 135 7 8 9 2250 10 11 12 315 1 2 3 LOCATION AND IDENTIFICATION OF THERMOCOUPLES m o,e 5.,
j I : .
q si O 35 I
1 - -
10 400*C 450*C 500*C 550*C 600'c 650'C E TC # T MAX (*C) (SEC) (SEC) (SEC) (SEC) (SEC) (SEC) 1 715 826 405 194 167 44 '5 2 502 308 81 14
- O 3 297 4 645 925 427 160 57 27 5 443 293 6 271 ,
7 644 997 473 178 74 - 27 8 475 413 60 9 301 10 644 364 200 121 80 27 11 466 119 17 12 279
'I O
{l ~
}- PILGRIM THERMAL SLEEVE MOCKUP TEMPERATURE
SUMMARY
J Table 5-3 I !
10 3e I
1
s l
O l I l B
I J
110 0 , , , , , 2 012 .
. 1000 - -
1832 g -
~ ~
I '
f*
4 800 Cniti,ation el -
groin-boundary g
m pr ecipita tion -
1472 g
$ 700 -
1292 w
> \NQ '
m O $ 600 - " %
w 111 2 g a- ,\
s k 500 - -
932 e N,\
o
~ e ' s' i ' ' '
400 752 0,015 0.15 1.5 15 15 0 1500 m TIME, h FIGURE 5-10. TTS DIAGRAM FOR CARBIDE PRECIPITATION ON 0.057. CARBON TYPE 304SS WITH MOCKUP OTS UPPER BOUND J TEMPERATURE DATA.
I 3
1 b end of the OTS, and representing the most severe thermal cycling recorded, is also shown. A conservative upper bound curve representing TC no. I data comes close to the TTS curve but does not cross it. A TTS curve for a 0.062%
carbon material is expected to be shifted slightly to the left which would O' then intersect the TC no. I line and indicate some degree of sensitization.
I It is also expected that normal heat to heat variation in sensitization rates noted for materials independent of carbon content and localized metallurgical and chemical variations within a single piece influence the actual
~
sensitization of any specific heat or area.
~
Furthermore Ref. 3 shows that strain can influence sensitization kinetics in 304 stainless steel. A continuous cooling sensitization study on a heat of 0.05% carbon material shows that strains in the order of 3 to 5% (compressive 1b or tensile) could increase the critical cooling rate (to avoid sensitization) by a factor of 5. When multiple rather than single cycles of strain and temperature were applied, it was found that strains as little as .8% per cycle could influence the sensitization kinetics. Although this study was done at significantly higher temperatures than encountered on the mock up thermal sleeves and was concerned with continuous cooling sensitization, it indicates O that alternate application of incremental strain and heat can influence sensitization kinetics and expected sensitization. This is expected for a diffusion controlled reaction. The deflection of the OTS end in both the mock up and the Pilgrim sleeves indicates severe levels of strain, much nore than I
would be expected from a through wall groove weld on this material. In addition, the number of passes required to make the fillet wel , hlence, the J ~
O 38 1 -
/%
thermal / strain cycle seen by the material is significantly greater than a groove veld. Other factors that can influence the degree of local sensitization are the welding variables as discussed in sections 5.1 and 5.2.
}D Based on the time temperature data, it is not expected that severe sensitization would occur over any appreciable length of the OTS 0.D. from the attachment weld of the sleeves. It has been shown, however, by EPR measurements and metallurgical examination that severe .to low sensitization occurs in material with 0.062% carbon up to 1 1/2" and for a greater distance for lesser degrees of sensitization. It was also shown that this condition is 4 .
not uniform arotad the circumference. It is theorized that this sensitization anomoly is explained by the potential increase in sensitization rates due to r3 multiple strain / heat cycle caused by the fillet veld. It also appears that 1d the T.C.s were not necessarily located in the worst heat input locations based on the specific weld sequence used. Heat to heat variations in sensitization response can also account for variations between predicted and actual material sensitization.
o i-J I
1
\
/'
\ 6.0 Discussion of the Pilgrim Field Thermal Sleeve Cracks The cracks noted on Pilgrim thermal sleeves can be categorized into three categories. These are (1) cracks which occur adjacent to the weld pads, (2)
'O circumferential cracks which occur away from the veld pads but within approximately 1" from the end of the thermal sleeve, and (3) circumferential cracks which occur away from the veld pad, beyond 1" from the end of the sleeve and occur exclusively on the machined surfaces.
Category (1) cracks occur in the sensitized heat affected zone of the.
~
welded pad which have high residual stresses due to the combined shrinkage from the pad welding and the welding of the thermal sleeve fillet veld.
p Category (2) cracks occur in areas where the mock up shows severe sensitization can occur and high axial residual tensile stress are also presene
~
Category (3) cracks occur on or beyond the machined chamfer on machined surfaces. The machined chamfer is approximately 2" away from the end of the thermal sleeve. It can be postulated that this area of the Pilgrim thermal sleeve is sensitized from the fillet veld beyond that noted on the mock up which shows a slight effect. This may occur due to normal heat to heat variations in sensitization rates known to occur in different heats of materials even with similar carbon contents. The heat input differences I
between manual welders using the same welding procedures can a so.' add to a
.i l A V
40 l
1
E D
(V degree of sensitization increase. It does not appear likely however that significant sensitization occured in this area based on the low heating rates noted during the fillet welding even considering the accelerating effect of strain. A more likely cause for these cracks is the presence of a shallow cold work layer caused by the 0.D. machining possibly with the combined effect of minor sensitization. Both the mock up and Pilgrim OTS were machined on the 0.D. approximately 2" from the weld end and machining can leave a thin layer of cold worked material on the surface depending on the tooling and machining variables used. A cold worked surface layer is susceptible to IGSCC in conjunction with the high axial residual tensile stresses caused by the fillet weld which has been shown to exist beyond the chamfer. Cracks of this nature have been found to extend only to the depth of the shallow cold work layer.
The fact that the cracks in this category are shallow is supported by a comparison of the P.T. results and the R.T. results taken on the same thermal sleeve. The cracks that fall into this category and are visible by P.T are identified as 2 on N2-A, 5, 6, 9, 10 and 11 on N2-E and 2 and 3 on N2-F. Of these only 2 and 3 on N2-F are also detectable by R.T. indicating that the other cracks are shallow as they were not detectable by RT. It appears likely that areas 2 and 3 of N2-F may have been more heavily cold worked than the other areas. The cracking of thin heavily cold worked surfaces have been noted in many instances in the field. Some examples are I.D. cracks noted in the N-2 safe ends of a domestic operating plant adjacent to an I.D. fillet weld in a heavily ground area outside of the HAZ. Other examples are the numerous shallow cracks noted on the steam dryer support ring 0.D. in heavily worked ,.. ,
4 -
"b I
41 1
,m surfaces due to forming and not associated with sensitization. This has occurred in a number of domestic and overseas operating plants. It has also been established that BWR water chemistry has a direct correlation to IGSCC of cold worked 304 material. The first few fuel cycles at Pijgrim shows D
relatively high conductivity which may have contributed to the cracking.
The comparison of the Pilgrim cracks noted by P.T. to those noted on R.T.
on the same thermal sleeve shows that there are no cracks noted by R.T. which were not also noted by P.T. A comparison of cracks noted by both inspection methods also indicates that the crack sizes as determined by R.T. are similar
-. or smaller than that reported by R.T. This observation indicates that there are no sizable cracks starting from the I.D. and that the cracks observed represents IGSCC propagating from the 0.D.
I" Based on the above discussion, it is concluded that the cracks in category 3 occur in the thin heavily cold work surfaces generated by the O.D.
machining which is conducive to IGSCC possibly assisted by minor sensitization. The axial residual stress for circumferential cracking are present from thermal sleeve fillet veld.
1
1 !
l
' 7.0 Conclusions i
7.1 Based on the results of this mock up and on noted field experience, it is concluded that all areas on the Pilgrim N-2 thermal sleeves where cracks Q were noted had conditions conducive to IGSCC. These include high residual tensile stresses, weld sensitization, sensitization accelerated by cyclic strain / heat, machining surface cold work and, possibly water chemistry. No evidence was noted to indicate other mechanisms were operative.
.g 7.2 The EPR measurements indicate that the inner to outer thermal sleeve fillet weld produces local sensitization on the outer thermal sleeve 0.D.
o V for distances up to 1 1/2" and more from the weld end. The sensitization measured by EPR was verified by metallographic examination of the microstructure.
D .
7.3 ' Residual stress measurements on the outer thermal sleeve 0.D. show relatively high residual axial tensile stress up to and beyond 2" from the fillet welded end. This supports the analytical results which predict the presence of high residual tensile stresses. These stresses are the result of severe diametral shrinkage noted on the Pilgrim sleeves and the mock up sleeves due to welding.
~
43 O
V
I- 7.4 The temperatures and times at temperature attained by the outer thermal sleeve O.D. during welding, when compared to typical time, temperature, sensitization diagrams, indicates that the material should not be sensitized to the degree and axial length noted on the mock up. It is
'O strongly suspected that the high degree of strain due to weld shrinkage when combined with the repeated application of heat due to the multiple veld passes produced sensitization beyond that due to heating alone.
This phenomena has been reported for temperatures above those reached on l
the mock up but it is believed to occur at lower temperatures as well.
It is also believed that the thermocouples may not have been located in J the area with the most severe thermal cycling. Heat to heat variations in sensitization response can also account for differences between predicted and actual sensitization.
l
~
O IJ I ; .
6' 4g e l
1 l1
I Io- 8.0 References 1 !
- 1. " Pilgrim Nuclear Power Station Recirculation Nozzle Repair Program and l l
Hydrogen Water Chemistry Materials Qualification", General Electric Co.
O NEDC-30730-P, Aug, 1984.
l i
- 2. Majidi, A., and Streicher, M., "The Double Loop Reactivation Method for Detecting Sensitization in AISI 304 Stainless Steel", Corrosion, volume 40, No. 11, November 1984.
~
'4 3. Soloman, H. " Weld Sensitization" proceedings: Seminar on Countermeasures for Pipe Cracking in BWR's, Volume 2, paper No. 24, EPRI WS-79-174, May
( 1980.
1 -
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b J Appendix A E
GE Drawings 197 R587 3 4
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g ,du i=2 " THERMAL SLEEVE' W' j +'.~.'.' lggg{
, 8Y *- *-I- ATTACHMENT-REClRC3NLET
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PILGRIM VE.hEL REPAIR REC 4RCUL ATiou INLET N0ZZLE '
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INLET THERMAL LlWER
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1 Appendix B I
GE Installation Specification m 2 m . ee . 1 j
Section 7 4
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10 "~'
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m
CEGER AL h ELECTP.!C PILGRIM ATCutC PoTER EQulP; EHT DEPARTMENT
...e
.22A2234 abo , ,, I s . .. 7 -1 ...,.,....,2 g ..
h{STALLAT10:1 v If3TRUCTION IttSTALLATION OF JET PUP RISER ASSEMBLIES
- n.:p SECTION 7 Erect a scaffold inside vessel and install platform at convenient locations 3
I 7.1 for work at elevations corresponding to jet , pump riser supports and shroud sup port. <
c v
I The fixtures requiied for completion ~ of the jet pump installation must be pre- -
pared in advance to prevent delay of the work. ,
' C . NOTE: -
The following describcs the insta11atien of one jet pump assembly. All installations will be similar and, depending -
I- upon manpower, tools, and other site conditions, more than . . ,, n one assembly installation can be done simultaneously.- ~ -
E - *:
.. .L. .- .
.7.2m Position ench' adapter concentric with its respectiv'e hole in the shroud .
suppprt:,. fit the insert and weld .inD.- position a utilizing
~e previously prepared . . . , .: and . -
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Syq.I:approvedweldingprocedures.
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The adapter to shroud 7 upport weld is a weld that req 6tres'a ~
c specific welding procedur6, properly approved and qualified.
,~ 3, ? . ' . "
'. J.his weld must also be done in a sequence to limit distortion - -
. s ..
7 of tije adapter. , -
I' z .
Position the outer recirc inlet thermal liner inside the recire
$7.3 ,
according to the dimensions given on the Reactor Assembly drawing and-w)1d '
.< .? -
~
place. .
h57-1)
- 7.4. For a typical assembly, install hold center locating fixtures (Fik(C-in each pf the two common adapters and establish the common centerlineRefer I, ,
D between the two adapters as shown in Figure 7-2. tion and As I the common cente'rline C-C' to the top of the riser.1e1 to C-C' an
- 7.5 Tack weld the alignment fixture brackets to the riser brace am pa J -
vessel wall as shown in Figures 7-2 and 7-3.It is desirable to have several fixtures with Steps 7.1 through 7.5.
Position fixtures such that they will not interfere with installation of brace l /
ams.
- 7.6 Establish a plumb line from the alignment fixture to point "D" on centerline E-E' (Figure 7-2). From this plumb line measure the distance "A" to the design This represents the total required location of the end of the thermal sleeve.
O distance from the center of the riser to the end of the themal sleeve. .
I *7.7 Detemine the required ~1ength of the then-al sleeve as described in FigureI 7-2.
Tha 10-inch center-to-face dimension'M11 . .,u o.
' of the e I field for each riser and this as-built dinension used.* J 8 k.
t GEN ER AL/h ELECTRIC PILGRIM '
A -
52A2234AB... , g 1 -
A1 Cuti PMER EQUIPMENT DEP ARTMENT .... -o c o-' a- m 1 ;
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} 11ATERIAL FABR{CATE FP.0M s -
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.CARB0tl STEEL OR SOLID I
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PLUMB lit!E SUPPORT BRACKETS .
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- DESIGli ELEVATION OF CEtlTER Y . ,_. '-
- 0F JET PUMP RISER BRACE ARMS E 1 g%
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REQUIRED LE!!GTil 0F TIIERMAL ,
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SLEEVE = A - CEllTER' DIS 1 y'
I . OF C0llSUtiABLE !!! SERT + liELD SilRIllKAGE -
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OR = A-10" - 1/16" +.1/8"
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[ CEllTER LOCATING FIXT
' (FIGURE 7-1) '
C <QD ~
/ ADIPTER IELDED IN SHROUD SUP Vc' "B" MEASUREMEllT Sit 0VLD BE AS POSSIBLE TO itAXIM1ZE AC
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- 1 JET PUMP RI'SER ALIGNMEllT FIGURE 7.2 -'"}'g*g 1,21971 1 .- -
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- . dENED L ?* ELECTRIC
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.:o 22A5 2 3 4 AB.,
.., 1 ATCMIC POWER EoulPktENT'.DEP ARTMENT
. - . . .'*" .*' '"" ' S o
, '- 'a 7-4 I1ALLATION IriSTRUCTION . ::<. l . . ,,e : ,
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Pads in Vessel E. ..
Exact naterial and shape is not ily welded to This sketch is to show concept only.
critical except that carbon steel shall not be terporarl f4..t nrNod and w I pads filler.
areas.
in vesse1; use safe ends of stainless. stee i
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j E .- ALIGN:'EMT T00LillG FIXTURE *seNK.he{'},Yb FIGURE 7-3 .
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PILGRIM ,
. ATCWC PCWER EoutPHENT'oEPARTEEAT ...e..22A2234AB.c.... ,_u,6 1
.-.74 _ ._m. t O
L,sALLAT10W If6TRUCTION '
I 7.8 It is suggested that the distance This can"Pa.fror.Lthe_
then be used as anplumb inside line to a hi en vessel wall be measurement measured (B minus 1/2 riser and recorded.
diameter) When setting the riser.
O l $7.9 Measure, cut, and weld prep the thermal . sleeve to the required le ... .
i I See Reactor Assembly
- 7.10 '
e .
drawing' for weld-prep sel, as shown in Figure -
E WB 0TE: ~ -
-brace is gfe piece unit and does not possess ., ,.
q The dis [k'tscapab.117ti s A temporary
- s. brace arrangement - , .
l ~
adjustme -
desi.gned tq provide adjustment during r,iser installation d .
tan be utilized until the riser is,fi6 ally positioned an
..- f the permanen't brac'e-itm. fitted and iristalled. 'The tempo- t' . ' -l. . .,. - ' . ' ' ' '.
y .
rary brace can be attiched to1the~ vessel pad in an area .
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manent brace arm while 1U.ma'intains
- ?.' .
. .: : the riserz..po .
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5
' Insert a properly cut and aprep
,-m . ,
& red
. . f . .thermal
. : f. _
....,.. q. sleeve into .3 (m) '7.11
!,7 . . . . ,
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~
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culation inlet nozzle. ,p : .- .
A clamp arrangement simil-ar to' ling .
- 7.12 Rig the riser and l'ower it into vessel. -
that shown in Figure 7-4 should be used to prevent possible.- damag I
surfaces at the top of the riser. - -
O times. 5 't .
I .
7.13 Fit the bottom of the riser to .the thermal sleeveWeld sleeve outer end as required.
A fina1 check from outside is necessary.At the same time
'line established and positio -
joint design is shows on the Reactor Assembly drawing.
tion the topThis of the riser so that it is centered on. the vertical d is accomplished by inserting the alignment fixture, Figure in Step 7.7.
7-5, into the top of the riser and aligning the'two This positions plumb the top bobs equ I and supported from the brackets as shown in Figure i
J ances are satisfactory, securely tack weld the 7.14 h
that
, riser to thermal sleeve weld canll be 7.15 d is optional completed Whether I. original alignment between riser and thermal sleeve is maintaine .
' riser is actually removed from the vessel for. welding of the e with the site installation program.
1 Complete riser to thermal sleeve weld.
7.16
- ~t
- ' m asevte: g B-4 . JAN 12197I j
a
.- N E h' Ell A L ELECTRIC - . , f ,PILGR IM ,
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.. ... .. . - . 22A2234AB....:. 1 :l ATCMIC ' POWER EOuiP'uENT dei'i2TMENT ,
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10 Inch Sche <tule 30 Pipe I ~ -:
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1.!FTINt; DEVICE - JET PtNP RWD _
FIGURE 7-4 JAN 1 2 -
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PILGRIM GEHER AL ~'n ELECTRIC j
ATCMIC s .
POWER EQUIPMENT DEPARTMENT
..;,. . 22A2234 AB., , .. 1
' - *--a 7-7* **.'*~*-'=8 5 1STALLAT10!! IliSTRt!CTION *.
4 - 17 3 x 1/4 Inch Clamps * *
.I with Cap Screws ,
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E
- i g 1/16 Inch Deep Slot Across '
ach Disk to r osition 8
l Optional Slot 'or ..
dge of Scale en @ ,
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enterifre of Disks w,.....v..., __..e......,t
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3/4 Inch AluMnum Disks Reference . . ......... . Mt 'q:. W, 45f:-)
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', - 'e---Jet Pump Trcnsition . ,
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s ALIGNitEllT FIXTURE FOR TOC OF RISER -
FICURE 7-5
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I .. -"I' GENER AL h ELECTRIC - PILGRIM I 22A2234AB. . .. 1, A1 Cult PowtR EQUIPMENT DEPARTMENT wee
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PLUMB SUPPORT (FIGURE 7-3) WITH 3- i
-- PLUMB DOBS TO ALIGft RISER AND 2 i
- PLUMB B0BS TO ALIGN IrlLET HIXER . l RESTRAltlER CRACKET J . .
I ... .. . ,
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RISER ALIGNMENT FIXTURE
}. f g$ [
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-l.! FIGURE
, 7-5)
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y RISER !! RACE -. .. .
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- J5T PUMP RISER $ ,',.'.[..:.h-[,.If
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~ THERMAL SLEEVE 7
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' 'h I .---- ADAPTER
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' _3 ARRANGEMENT FOR RISER FIT-UP -
FIGURE 7-6 assuto &
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GEkEhlh ELECittlC PILGRIM l ,
ATOMIC PCwER EQulPatENT oEPARTLLENT
.22A2234A B .,,, . 1
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. ,.. 7:9 co-,.~.-.., p
{J Al.l.ATICM INSTRUCTION * -
4' .
7.17 Reinstall the riser, positioning the inner themal sleeve relative Tack weldtothe the outer themal liner as detailed on the Feactor Assembly drawing. Recheck riser align I thermal sleeve to the outer themal liner. ,
satisfactory, complete the themal sleeve to outer liner weld. .
. 1 0 ,
Position the brace assembly such that it is level and symmetrical to the !l 7.18 I riser. Refer to the Reactor Assembly and ReactorTack Requirements Drawings for dimensions and tolerances.l wall pads.
Installation weld the brace assem-and Assembly l'
bly in position, both.to the .~ r,iser and vesse g .
NQ..a
. NOTE: - - ..
s . . ,s. 2, c...* .. .
3 A template 'can be . utilized to obtain the proper riser brace I
fit.
The a'rms of the brace assembly have excess length to . . . .'
- The arms should be trimed to the .' 'Veld .- - ,' :
L permit field fitting'. required length and. weld prepped.- ' ~ - shrin
".t? '
E .. > .
' ' included in the .arflength so 1/16 inch clearance - ~ ;c. .7. is main- t ~".' .
W tained b'atweelithe41ser and. .; yoke. .L 'yt.l ;., ... .: .3. ' ' s : ~. .-.: .
Nf '.',, '*. '
.- ..[. . ._
'TM -
2 .19 ' Complete i111 .riser b' race. arm'N' elds y . v..:, :gx c. . . & 4.;. a f ..,,: . .
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h L Appendix C Combustion Engineering Drawings E232-345
" E232-358 E232-369 I
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Appendix D I
1 Pilgrim N-2 Thermal Sleeve as Built Records O
~
1 D-1 PT Record of OTS to Nozzle Weld D-2 ITS Fit Up Measurements O D-3 ITS to OTS Weld P.T.
D-4 OTS End Shrinkage Measurements D-5 Jet Pump Riser to its Weld P.T.
.I
'I
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i .
1 l . (Ms#.iwsyscnow 'oATA . SWEET.. - ' <.M & sce .
PF
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BATE ' ' d -BS 2 7d ,
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The S-56 DOS tester can accurately measure the degree of sensitization of O 300 series stainless steel within a short operation time. E3 4
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- The S-56 DOS tester used as a criteria in the evaluation of the degree of sensitization the peak current ratio I /I rinaboth anodic and reverse polarization processes, which provides improved reliability and accuracy in comparison to the older techniques.
The S-56 DOS tester is controlled by a microcomputer interlinked with a potentiostat which is automatically operated. Analytical results are printed out on a tape providing a permanent record. The equipment used made use of the Model 750 Field Measurement Probe originally supplied by the InstruSpec Company with the Model WC-5 (SENSITEST-NDT System) Sensitization Detector. The InstruSpec Field Probe was used with the Model S-56 DOS tester instead of the epoxy cemented probe
*O supplied with the Model S-56.
The field measurement probe is a miniaturized electrochmical cell 1.27 cm in dia. meter by 2.5 cm long which is constructed from Teflon bar stock. The I cell contains a pencil type standard calomel reference electrode within, and a tubular platinum wire counter electrode inside the cell body. The cell is sealed to the component with an ethylene-propylene 0-ring. The cell is connected by long wires to the Model S-56 DOS tester. Prior to fixing the probe to the component, che surface to be tested was prepared by polishing the surface with metallographic grinding paper through 600 grit. The surface was then degreased with acetone and a mask of E4
A V electroplating tape was fixed to the surface. The cell (charged with electrolyte) was centered on the masked opening and held in place with Velcro tape. The electrode cords were then connected to the S-56 DOS tester operation panel, and the instrument was prepared for test with the following parameters: Electrolyte: 0.5M H SO4 and 0.01M KSCN Area Selection: 31.7mm (mid-range of areas recommended for 30*C) Start Potential: -0.45V for 304 S/S Current Range: 100MA Return (Passivation) 6 Potential: +0.3V (appropriate for material with high passivation capacity) ( LJ With the above settings arranged, the test was initiated and the test sequence diagrammed in Figure 3 was engaged. The measurement is completed automatically and unattended in about 15 minutes after the start button has been lit, and measurement results are recorded on the printer. When the test sequence ends, an alarm sounds. In case of abnormal operation conditions, the I measurement is interrupted, an alarm sounds, and some error message is printed out. Figure 3 outlined some of the operational error conditions. J Qualification of Double Loop EPR Test Prior to the application of the double loop EPR test, a laboratory qualification was performed to demonstrate the applicability of the S-56 DOS s tester and InstruSpec field probe apparatus. The following are the three primary objectives of the qualification program. E5
A yi 1. Demonstrate correlation of EPR test results made with ISHi cell with results of EPR tests made with the InstruSpec field probe.
- 2. Demonstrate correlation between reactivation ratio, I /I,and SCC susceptibility in 304 and 316 stainless steels, where all tests are made with the InstruSpec field probe.
Demonstrate repeatability of readings and to establish confidence in { 3. single readings made in the field in high radiation environments. F A series of stainless specimens were tested with the S-56 DOS tester and either the IHI (supplied with the S-56 DOS tester) or the InstruSpec field l probe. The tests were performed on well characterized materials of known heat U treat conditions, and of known response to an A-262 oxalic acid Practice A etch test. l The test results are summarized in Table 1. The criteria for sensitization evaluation is presented in Figure 2. k The conclusions of the qualificatior. program are listed below:
- 1. IHI and InstruSpec field cells give comparable results.
- 2. Type S-56 DOS tester produces valid sensitization discrimination over a wide range of values.
O E6 I I
4
- 3. Type S-56 DOS tester produces valid sensitization discrimination over a wide range of values.
- 4. EPR ratio is independent of grain size. (Grain size determination not i
required). j I l
- 5. Cold work does not affect readings.
- 6. EPR with the S-56 DOS tester correlates well with A-262 oxalic acid Practice A test.
J't
- 7. The S-56 DOS tester gives permanent quantitative record for the EPR test.
10 8. EPR determination with S-56 tester is viable technique, applicable in the field with the InstruSpec field probe. J E7 4 O I 1 .
4 TABLE 1 EPR QUALIFICATION TEST DATA 1 Susceptibility Test No Speci.en Description Q To SCC Notes A* Furnace Sensitized 304 S/S 0.0386 High IHI Cell B Furnace Sensitized 304 S/S 0.303 High SENSITEST field ce11 C* Non-Sensitized 304 S/S 0.007 Very Low IHI Ce11 5 1 F.S. WOL with 0.07 Carbon 0.139 High
- 2. 304 S/S Pipe Base Metal - 0.003 Very Low Ht. #181190 As-Received Condition r
3 304 S/S Pipe Base Meta 1 - 0.003 Very Low Repeat of As-Received Condition Test #2 4 304 S/S Pipe HAZ Ht. #455561 0.003 Very Low Not Cracked in PTL Q 5 Pipe HAZ, Ht. #181190 0.067 Low Cracked in PTL
'wJ 6/4 304 S/S - 650*C for 30 hrs 0.133 High Sensitivity Base 11ne 5/9 316NG - Annea1ed, As-Received 0.009 Very Low 1/5 316NG - 700*C for 300 hrs. 0.034 Low 2/6 316NG - 600*C for 48 hrs. 0.009 Very Low 3/7 316NG - 700*C for 300 hrs. 0.034 Low
+600* for 48 hrs.
4/8 316NG - 30% CW + 600*C for 0.034 Low 48 hrs. 12 Standard *K1481-S 0.010 Very Low Marked 0.006 DOS 13 Standard *K1481-F 0.307 High Marked 0.588 DOS
. Testee .it, 1H1 c.11. .11 ot,er tests .aee .ith SzNS11EST ,1e1d ce11.
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+300 mV -- ---- - - - - *l l
. ANODIC SCAN su 4
s I "$ REVERSE SCAN ' $ l ' I Ec - (N -400mV) SCAN RATE = 6 V/hr. Ir Ia 1.0G CURRENT > l ', Evaluation is by the ratio I /I, 15 I Figure 1. Schematic diagram of the Double Loop EPR Test. I 5 i E9 O I 1 .
~~ g f % m* g. 6 -,. Q ,- . % *m 6 8 O O O SCC suscapiibillry Irlis IRasetivation ratial Very low Lets then 0.01 l Lovv .
0.01--0.1 High More than 0.1 8 20W O 304
- a 368L a [38I
', o Ic03 -
oe 3:s e --- o . o C 500 - 331h __. - m ; 8. e hist.im O m I e 800 -
.t l
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e ', , i 'ido5C0 m , a 3.s na sa , 5.0 10 50 0.01 0.05 0.1 0.5 1.0 Reactivation estio.h (EPR test) Correlation between reactivation ratio (EPR test)
-2 and SCO suscep'libility (CBB test) of stainless steel
- IIHI technical research institute datal
FIGURE 5 TEST SEQUENCE l pturnonr...t mten. i. n , f -[ Turn on start swaten. jl Operation start I Potendai M 1 senasurement of open circuit samasure activation condition on testiaq surface Cathodic reduction
**["*l treatment at -1.DV when the open et potential asceeds -0.35V (or -0.25v Prin W t ' Pea c m ust g t,p Operation stops and alarm sounds. if potential M l l open circuit potential exceeds -0.3v (or -0.25V) even af ter reposting the cathodic reduction treatment twice.
) l EC ERRom rantout l l Anodic Po azationstart-0.45v(or-0.35v)l Cantinuosly polarine from -0.45 (or -0.35V) to passive pot
;. (+0.3.0.5.0.7v) l
,, $ S top l ' Operation stops and an alarm sounds.
l Anodic polarisation end (+0.3.0.5.0.7v) if the anode current flows excessively l I, v senesurement and pnataut la anodic poiari-sat. ion process peak current (1st lAD CVERANC:Z printout l
'g4sesamuramaat 1 and prantout passive state
- holdine current (1o1 l
w Operation stops and an alazz sounds. [ Caiculat.dna and priatout 2o/la l j stop l if the passivation is insuf ficient
, g or la is small and to/la> 0.01.
l meterned polartaation start (*C.3.0.5.0.7Vil Ce vously polarise to cathodic dizaction
- lIo/Ia ERROR pnntout l l Reversed poianzation and -0.4v (or ~0.3v) g
. h '
seeaeurament a .> priateut is rensmed $ polariaation peak current (Ir) i tion and priatout , , Turn off roast swatch. P" l Turn off start ownten. l Rad (operation time takes about 15 mintrtes) E -11 1 .
l E lo i 1 l l I I Appendix F Measurement of Residual Stress By the Blind Hole Drilling Technique a t i 10 I I ,I 3 n I 4 O I 1 .
5 an ri d J ENGINEERING SERVICES P.O. 301103 e RDsemN, m 94S4 e tels SIH045 I - June 23, 1986 Don Bertossa ,
. Seneral. Electric Welding Lab Building J 175 Curtner
- San Jose, Ca. 95125 b
Bear Mr. Bertossa We've completed the residual stress seasurements on your 304 stainless steel specimen. Figura 1 shows where the seasurements were taken. We used the blind hole drilling technique as specified in ASTM E937. At each location, Measurements Group
- strain gage rosettes type CEA-06-062UM-120 were installed. Strain sensurements we/e taken at depths of .010, .020, .030,
.040, .050, .060, .070, and .080 inches. The seasured strains are shown on the attached RS-200 Data Forms. The percentage of strain relieved versus depth divided by hole diameter was plotted f or each strain gage rosette. See figures 2 through 5. These figures indicate that the residual stresses are constant with depth for all rosettes at both the 135 Degree and 315 Degree Positions. The principal residual stresses on the specimen surface are therefore calculated using'the seasured strains at the full depth, .0B0 .
inches. The data reduction schese outlined in the ASTM standard was followed. The coefficients a and b were taken from the information supplied with the g strain gages. Technical Note 503-1 published by the Measurement Group is a good reference for a description of the hole drilling technique and subsequent data reduction. I 1. Measurements Group, Inc. P. O. Box 27777, Raleigh, North Carolina 27611 (919) 365-3000 O I 1 - 7
4-O 1 The calculated principal residual stresses, hoop stress, axial stress and direction to the maximum principal stress from gage 1 are as follows: 135 Dearee Position 3 Ros. Maximus Minimus Dir to Max Axial Hoop No. Stress, Ksi Stress, Ksi Str. Degrees Stress, Ksi Stress, Ksi 1 7.3 -16.4 -3.0 7.2 -16.3 2 7.2 2.8 B.5 7.1 2.9 3 6.2 -B.0 -14.0 5.3 -7.1 4 ti.1 -2.6 -21.1 9.3 -0.9 315 Deoree Position - F i 15.0 -32.3 -12.6 12.5 -30.1 2 16.7 3.7 4.6 16.7 3.8 3 14.9 -10.5 4.6 14.7 -10.4 7 4 16.4 7.7 -10.2 16.1 7.9 The direction of the maximus principal stress is determined by sensuring from the direction of gage 1 which is axial the number of degrees indicated, where positive degrees are,in the counter clockwise direction. There has not been enough research done on the ASTM nethod to evaluate the accuracy and precision of it. However, other reseach has shown that when the calculated residual stresses are greater than 65 percent of the saterial yield strength, positive errors of up to 30 percent can be obtained. This is O due to plastic deformation occuring in the material around the drilled hole. Since the yield strength of 304 stainless steel is approximately 33,000 psi, the results for rosette 1 at the 315 degree position must be viewed with this in sind. The results for this rosette would in all probability be g auch closer to the other rosette 1 results than indicated in the above chart. Should you have any questions, please give se a call. Sincerely,
& bisw Mechanical Engineer I
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c -- -= - 2_a-_. ...2._ Io 1 O I I Appendix H Mill Certified Test Report i H-1 Mock Up OTS Material
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l LACORATORY CERTIFICATE A N A LYTIC A L
- Anamet L a'3 0 r a t o r i e s , Inc. =~;^: ,.AL .
i HIGH TEMPER Af tJRE 1 2827 SEVENTH STREET . SERMELEY. C ALIFORNI A 94 780 . e4 t 51 S 41 S 7 7,1 APPLIED RESEARCH PHYSICAL TESTING February 5, 1986 3 L;iECE ATC5Y NUMEEF.: 286.52 P.O. Nc. 529-E6A2761 5UEJECT: . Cne Metal Ccupen f:,r Ci:ecical Analysis Beat 32913cf per AEME St.-312, type It. MABK: 3C4 Eebruary 5, 1956 0.:.TE ELEM!TTEE :
, FEPCRT TC: General Electric Cor.pany huclear Energy Opera-icns Pouer Syste:S Engir.s+.rin c Dsit.
175 Curtner Avenue, hf. 7-4
- San Jose, California 95125 Attn: I.L. Chapman
(]m CEEMICAL ANALYSIS - Cartcn (C) C.Gtif Chr c:itz (Cr) 16.45: - Ccpper (Cu) C.165 M:- n g a :e .s e (Mn) 1.C53 Mc ly b d e n t.:: (Mc) 0.2'% 3 filckel (N1) 6.44% I . Ph c s pr.cru: (F) (SI) C.C29% 0.5CI fl . i 'C r J == = a =u T P. '. t < *. C 4'? C perfOr ?te 'O a 0 0 0 rd a.* 0E Wi t h f. !* e pUrt.hei - cf.IE: I . . Ec s g e c t f 11 suc:r..m c . s
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Power E Industrial BEGMTEL GORPORATIUN Metallurgicat t 9=lity O I 9 Division WELDING STANDARD Procedure speelfication Coatrol Sereices Date ,, a f yo,
=
Preoared SJh G,.uvtW -
P8-T-Ag i By 4MM ! . Revision 6 Approveh8/dadb g Manager 6f Engineering C. B. G ratsle- , Authorized for use only when signed by the Manager of Engineerine of the Divismn.
- l. 0 SCOPE 1.1 This procedure is to be used for welding Austenttic Stainless Steel
- piping materlats using the open-butt method with an internal arson purge, and for fillet and socket welds without an internal arson purge. The thickness range quallfled is 1/16-inch through 13/16 inch.
7 , 1. 2 This procedure has been quallfled under Section IX of the ASME N Code and the ANSI Code for Pressure Piping B31.1.0 and B31.7. 1 U 2.0 PROCESS n Welding under this procedure specification shall be done using the Gas Tungsten- Arc process. The root pass shall be made with the additinn h of bare filler rod (no consumable inserts). An internal argon purge shall be maintained during deposition of the first two passes for butt welds. m , 0 3. 0 BASE MATERIAL-
,. This procedure specification shall be used only in welding the austenitir stainless steel materials shown in Table I, Drawing No. P8.T-Ag-1.
7 ,0 4. 0 WELD MATERIA 1.S 4.I The filter metal shall conform to the A-7 weld metal analysis
- O , number and the F-7 grouping number shown in Section 1 X of the
'I ASME Code. l
- 4. 2 Bare filler rods shall conform to ASTM A 371 Corrosion Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes. They shall be of the classification shown as follows:
4 I e 13 1 * - * * ~ ' - _
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.m . _ ..s - - - = ,. n . . wc
l 3 ASTM - Agg j
- Base Metal rype Wroumht Grades cast crades Electrode clanalfintion _
304, 304H I 308 304L F8, CF 8 CPF8 CF 3 F8M, CF8M, CPF8M ER 308 En 308 L ER 316 l 316, 316H Sl6L CF3M ER 316L 317 --- ER 317 l 317L --- ER 31710.04 C maxl 321, 321H F8T ER 347 347, 347H F8C, CPF8C ER 347 {! CHIO, CH20 CPH10,
. 309 CPH2O ER 309 109e, CMS. cPH8 ER 309 (O. 08 C max.1 ,
- 5. 0 _wr f EING *
, 5.1 ceneral
*** No welding shall be done when surfaces to be welded are wet or f ,,
, covered with ice. No welding shall be done when rain or snow N
is falling or during periods of high wind unless the work is pro-I U perly protected. I
- 5. 2 Position l h This procedure specification covers welding that may be done in any position.
U 5. 3 Prensration 'of Base Material
;- 5. 3.1 Fleid beveling for butt welds shall be done by machining or grindlag.
_ 5.3.2 The method of base metal preparation used shall leave the weldlag groove with reasonably smooth surfaces free from C notches or other harmful irregularities.
- l ,
5.3.3 The angle of bevel, spacing, and other detalls shall be in accordance with weld end preparation drawings included in the job specifications. If not included in the job spec-liteattens, the angle of bevel, spacing, and other details shall be essentially in accordance with Drawing No. P8-T- Ag 2. FLt-up and welding of socket and fillet welds shall be in accordance with Drawing No. P8 T-AR-3. 5.3.4 Prior to fit-up and weldlng, the beveled edges, root land. and backside of each weld end shall be cleaned to bright clean metal. Dirt, oil, or grease shall be removed with I 9 -- x y
- - __=__ . , _. m e.
.- ., .. pg.T.Ag 2 .
w - acetone. Other foreign material shall be removed by II filing brushing, or grinding. ~g 5.3.5 Stainless steel brushes that have not been used on othe'r than stainless steel material shall be used for hand and 3 power brushing. 5.3.6 Grinding shall be don's with rubber or resin bonded alumina or silicon carbide grinding wheels. No grinding F- shall be done with wheeft previously contaminated by grinding materials other than stainless steel, t~ 5. 4 Electrical characterlatten 5.4.1 Cas Tungsten-are welding shall be done using a one or
" two percent thortated tungsten electrode with direct current straight polarity (electrode negative).
5.4.2 Recommended electrode sizes and values for amps and
- volts are shown on Drawing No. P8-T- Ag-2, and
- 7. ,
P 8 -T- A g-3. U 5. 5 Can Shieldina and Purmina k 5. 5.1 The shielding gas shall be argon at 18-5 cfh through the welding torch. 5.5.2 The backside of the weld joint shall be purged with approximately 35 cfh of argon for at least ten minutes
# prior ~ to welding.
5.5.3 During welding of the first two passes, the backside of I the weld joint shall be purged with argon at approximately ) - 15 cfh. O 5.5.4 To factiltste purging the backside of the weld, purge plugs or balloons shall be used as shown on drawins No. PB-T-Ag-4
- 5. 6 Te chnta ue -
5.6.1 Clamps, welded clips, tack welds, or other appropriate means shall be used to properly align the joint for welding. Attachments used for fit-up shall be made of stainless steel material, and welded with either E-308 electrodes or with ER-308 filler material. The attachments shall be removed by grinding out the tack welds. The ground area shall then be liquid penetrant inspected. O IS
5.6.2 Tack welds shall be welded la full compliance with this 3 I procedure spectilcation and if not removed, shall be in-spected visually for defecta prior to starting the continuous weld. 5.6.3 Each weld bead shall be cleaned baiore depositing the next succe.asive bead. Each weld layer shall be free of irregu-larities of deposit, such as high spots, deep crevicsa. undercuts and poresity. 5.6.4 The progress of welding shall be upward for vertical welding (pipe axis horizontal). For horizontal welding (pipe axis vertical), the weld metal shall be deposited using stringer beads. Weldlag shall not be interrupted
' until at least one-third of the weld thickness is completed.
- r. ,;
5.6.5 Each weld layer shall be completed aroung the entire circumference of the weld groove before succeeding weld passes are made.
.N
- 5.6.6 The weld joint shall be inspected for the presence of D moisture. If moisture Is present the joint shall be dried
-+ ,
by the use of solvent or heating with a torch to remove the moisture.
- 5. 7 Annen rance of Weld 5.7.1 The appearance of weld layers shall be essentially as shown
~0
- on Drawing No. P8.T- Ag-2 and P8-T-Ag-3.
- 5. 7. 2 The width of the weld beads In vertical, flat. and overhead O positions should not exceed the width of four diameters of the electrode being used, and the thickness of the layer
) should not exceed 1/8-tach. I .
' 5. 7. 3 The final weld layer shall be slightly convex and shall fuse Lato the surface of the groove face such that the toe of the weld extends beyond the original groove edge (on both sides) a minimum of 1/16-inch and a maximum of 1/8-inch.
I .
- 5. 8 .Kggst r of De fe ct s-5.8.1 Cracks that occur during welding shall be re moved by grinding or chipping. Before welding is resumed, liquid penetrant inspection shall be used to determine that the cracks have been totally removed.
I e 4-16 - D^ - ~ _ _ - _ s . m .. ._,
5.8.2 After welding has been completed, defects La escess of the applicable standards of acceptance detected by the O 9 Laspection techniques required in the job specLfications shall be removed by grindtag or chipping and rewelded in full compliance with this procedure speelfication.
- 6. 0 PREHEAT AND INTERPASS TEMPERATURE
~6.1 Minimum preheat temperature shall be 60 F.
- 6. 2 Maximum Laterpass temperature shall be 350 F.
- 7. 0 POSTWELD HEAT TREATMENT Postweld heat treatment is not required.
- 8. 0 WELDER PERFORMANCE QUALIFICATION g
Welders who are required to use this procedure specification shall be A quallfled in accordance with Bechtel Corporation's WELDING STANDARD - I ..
~
WQ-F-1. Performance Specification. N - 11 O I e Q O l 0 . J I 6 2/27/70 R evised Pa rm - 1 1. 4. 6. 4 - a n d M _ *1 1 CMP ARM G 10/10/69 R evised 6. O Revised Note 4 en Drawine PE-T. As-3 AMB 4 2/05/69 J D it 3 12/05/68 Revised Pa ra.1.1. 5. 3. 3 and drawine P9.T. As.1 Revision By l No. Date l e 17 ,$, C
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W l TAGLE l i I L HIGH ALLOY AUSTENITIC STAINLESS STEEL g P-8 Grountan e I W ' b l 3 Mate rla t Tensile Strength l y Soccification p.1 uta
-l 1*J ASTM A 182 75,000 Flanges and fittinas (18Cr ANil ~
Grade F .304 8 Grade F 304H 75,000 " " " Grade F 304L 65,000 " " " f g Grade F 316 75,000 " " (18Cr-8Ni-Mon Grade F 316H " " I 2 75,000 " Grade F 316L " " { Grade F 321 65,000 75,000 " " (18Cr ANi-Ti) I Grade F 321H 75,000 " " " Grade F 347 75,000 " " (18Cr-8Ni-Cb) Ic l 3
] Grade F 347H 75,000 " " "
II SX ASTM A 213 Grade TP 304 75,000 Tubes, seamless (18Cr-8Nh 1
) Grade TP 304H 75,000 Grade TP 304L 70,000 Grade TP 316 75,000 "
y (18Cr-8Ni-Mol I g Grade TP 316H 75,000 "
- i Grade TP 316L 70,000 "
I Grade TP 321 75,000 " (18Cr-8NL-Til , ' h j]g Grade TP 321 75,000 " "
- l. j Grade TP 347 75,000 "
(18 C r-8Ni- Cb Grade TP 347H 75,000 " "
]
! g3 ASTM A 249 Grade TP 304 75,000 Tubing, Welded (18Cr-8NI) Grade TP 304H 75,000 " " Grade TP 304L 70,000 " " j g ( g Grade TP 309 75,000 " (25Cr-12NI) f Grade TP 316 75,000 " (18Cr-8NL-Mon e 11 4 11 I}
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g A o/2D/M te ened 'or fic td ennst ructinn mn r__m_ m _ _ - _n. _e--_ g g WELDING STANDARD sm m en 3 Hlah Alloy Austenitte Stainless Steel, P-8 Grospag
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H lah Allov Austenttic Stainlana 4teet. P R dennnine 2 9 h ASTM A 249 (Cbnt'd) 75,000 Tubing, welded (18C r-M Ni- Mo n I 9 Grade TP 316H " 3 3 Grade TP 316L 70,000 "
^
I Grade TP 317 75,000 I 5 75,000 " (18C r-8Ni- T o 3 Grade TP 321- " 75,000 Is Grade TP 321H 75,000
" (ISc r -8Ni-r'o f, Jj Grade TP 347 "
Grade TP 347H 75,000 I g 2 g ASTM A 269 Grade TP 304
--- Tubing, seamless: welded (18Cr-8Ni)
;I g Grade TP 304L ---
(18Cr-8Ni-Mne q Grade TP 316 --- i Grade TP 316L --- G rade TP 317 ---
" " (18Cr-8Ni Tis Grade TP 321 ---
gg " " (18 Cr-8N1-Cb e gy Grade TP 347 --- 1>4
~
t ASTM A 271. Grade TP 304 75,000 Tubes, seamless (18 C r - 8 Ni) Grade TP 304H 75,000 I Grade TP 321 75,000 " (18Cr-8Ni-Ti) " Grade TP 321H 75,000 I g gl{
- Grade TP 347 Grade TP 347H 75,000 75,000 (18 C r -8 Ni- CM ~
O I <II g I H J t.1 I b, 4 i9 i ! _ O J I I A G ^ ., ......... _ _ ,= a- - H,8e
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ASTM A 312 Grade TP 304 75,000 Pipe, seamless, welded (IMCr-MNi) g 75,000 ,. Grade TP 304H " " " l Grade TP 304L 70,000 Grade TP 309 75,000 " (25Cr-l'2 Nil Grade TP 316 75,000 (18 Cr-MNi- Mm ' Grade TP 316H 75,000 i l 3 Grade TP 316L 75.000 " " " I8 Grade TP 317 75,000
" " (18 C r-M Ni-T ;i
( ]j Grade TP 321 Grade TP 321H 75,000 75,000 " "
- g " " ilB C r -8Ni- ch.
Grade TP 347 75,000 s 75,000 " " " Grade TP 347H 75,000 Forgings (18Cr- ANil
, ASTM A 336 Grade F 8 " (18Cr-8Ni-Tis Grade F 8t 75,000 s l Grade F 8e 75,000 " (18Cr-8Ni-Chi I "- 18Cr-8Ni-Nton 75,000
}{
.,g t Grade F 8M
- 70,000 Castings (19Cr 9NL)
*] ASTM A 351 Grade CF 3 " (l?Cr uni-un, Grade CF 3M 70,000 I
Grade CF 8 70,000 " (14Cr 4Nin g Grade CF 8C 70,000 " (19Cr-?Ni-Chi
~
Grade CF 8M 70,000 " (19Cr-9Ni Moi Grade CH 8 65,000 " (25Cr-12Ni) Grade CH 10 70,000 " Grade CH 20 70,000 "- 1 65,000 " (25Cr-20Ni .2C
,3 Grade CK-20 75,000 Pipe welded (A240 plate) (18C r-8 Nil If I1 l ASTM A 358 Grade 304 Grade 309 Grade 316 75,000 75,000 (25Cr-12NL)
(18Cr-8Ni-Moi (18Cr-8Ni-7 61 Grade 321 75,000 I . Grade 347 75,000 75,000 Pipe, seamless
" " (18 C r - 8 Ni- CS I (18Cr 8 Nil ASTM A 376 Grade TP 304 f
y Grade TP 304H 75.000 " " Grade TP 316 75,000 " (18Cr 8Ni N1.it Grade TP 316H 75,000 I Grade TP 321 75,000 (18 C r -8 N L - T i) Grade TP 32 tH 75,000 I ' Grade TP 347 75.000
" (18Cr ANi chi Grade TP 347H 75,000 i
ai A I h A ZmCD ASTM A 151. Grade CK-20 added _, ...i...m. as = ( MP
- = m rg w, WELDING STANDARD .
1 ,, - High Alloy Austenttic Stataless Steel, P-8_._.,_.g,
- ~ . . .4. ,s . , , ,
Grasplas PS _T,-As lag,
^ 9 %d.y*A-Q py;??ff,y W [.}
[, , High Alloy Austenttle S*alators Steel P-3 dreisnine'. -4 l ASTM A 403 Grade WP 304 75,000 Weldlag fittings (15Cr-8 Nil Grade WP 304H 75,000 l O g - Grade WP 304L 70,000 " Grade WP 309 75,000 (25C'r -12 Nil ll Grade WP 316 75,000 " (18Cr-8Ni-MM l um 3l g Grade WP 316H 75,000 " " 9J G rade WP .316L 70,000 " 3 " "
' 8 Grade WP 317 75,000
" (18Cr-8Ni 7.i hJ Grade WP 321 75,000 Grade WP 321H 75,000 " "
l I , 2 Grade WP 347 75,000 Grade WP 347H 75,000 (18Cr-8Ni rb, 70,000 Pipe, forged and bored ilRCr RNii
, ASTM A 430 Grade FP 304 " " "
Grade FP 304H 70,000 " 3 " "
! ,;] Grade FP 316 70,000 70,000 h
W J[ 32 Grade FP 316H Grade FP 321 70,000 " (18Cr:8N1-TI) Grade FP 321H 70,000
*'{ .
70,000 " " Il8Cr-8Ni-Chi
- Grade FP 347 1 " "
Grade FP 347H 70,000
. g w
4 70,000 Pipe, centrifugally cast (18Cr-8 Nil i ASTM A 451 Grade CPF 8 " Grade CPF 8C ---
" (18Cr-8Ni Chi h l$][ Grade CPF 8C (Ta maxi 70,000 " " "
" " (18Cr-RNi-Mni Grade CPF 8M 70,000
" " (25Cr-12 Nil Grade CPH 8 65,000 "
Grader CPH 10 --- Grade CPH 20 --- O d 75,000 Pipe, centtrfugally cast ilHC r-8 Nil I *1 ASTM A 452 Grade TP 304H
. Grade TP 316H Grade TP 347H 75,000 75,000 (IRCr RNi; Moi (18Cr MNi-Chi J D 4
I IL v
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I11 1 - " WELDING STANDARD High Alloy Austenitte Stainless Steel, P-8 Grouping PS T-As 4,el 4
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..r THICKNESSES OVER Yl6' 2G n NOTE: geg,egt}s are illustrative only. Exact details will vary with thickness II 3 1f Tungsten Electrode FL11er Wire R e ma rtr a I lIE ~- Otamet e r 3/32 Diameter 3/32 Amna 60 110 to Valt a 10 - 15 15 Root Pass 1/8 70 120 ij i/8 10 15 Remaining lave rs 1/8 80 140 4 u" l/8 ji I .
1 112
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ta nned fo r field enn at enettan vna
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WELDING STANDARD ,, - Weld Detalls my. m a [ * "- __ - .=
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SOCMET WELDING DETAILS ' i;-f.+T GUT NOT LESS THAM %~1% T Stir Met LEM T I ,y,,A ' a b _, / / - 1 S a I" l+ K T / 19 l' I ', 'H *- F
%~ MIN. ' t ,
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- 1 -NWPftoXtt4ATELY #6"8EFORE wtLDING Sa TmMOMINAL PlPE WALL THlCKNESS. :
1 lle 9 WELD LAYER DETAIL *J , g4 D 9M-I.- j{ 3 4 11 ; . 'g y, ' - P J#te -
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A , $,o 4 a g 3 4F 5F ZF E 1 NOTES: Weld detatts are (ttustrative only and will vary with thickness of material I '3 1. A mtalmum of 2 tayers is required. 3 2. Internal gas purging not required for fillet welds. s .i - Tungsten
) gj .*: kU*.,'.e
A m== volta Rema rks _ l bf '.*5E. ,* 4I 60-L to 10-15 Root Pass
/
j 3/32 3/32 t/8 70-120 10-15 5 t/s 10-15 Remaining Layers 1/8 80.t40 t/8 , 4 E 113 I nMP A Z/ZTMO Deleted Notes 3 and 4 en I AMB A 2/5/69 Revined Notes 1 and 4 and renumbered att no I fDB A 12SMS Added Note 4
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g WELDING STANDARD I esusu m
- WELD BEVEL AND LAYER DETAILS
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_q ADDENDUM TO WELDING PROCEDURE D SPECIFICATION P8-T-As I J The above procedure specification as modified by this addendum shall be used for tack welding the jet pump top Inlet and throat restrainer bolts on the Pilgrim Project. I:
- 1. The requirements contained in the attached sheets entitled
', " Procedure for Tack Welding of Jet Pump Keepers" shall y
be complied with, o General Electric shall furnish the necessary equipment for , 2. U welding; such as gages and fixtures.
- 3.
- Welds shall be made without the addition of filter snetal.
Welders shall be quellfled by welding four mock-ups that g 4. simulate production welds. O m l T
.3
. t#'4d-By~ Chief Welding Enginger I
Dati: 2/24/70 J I 1 I gg . .IIS - -
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. . '.IW uisition Engineers ~ * ' '
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"3 ' Presdent QC, Millstanc '
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Subject:
.PitX'ElimE Mt TACK WELDING OF JET Mf!P EEEPEP.i .
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..?n.,..** *'n l. 7 d by difficulties enemmtered'st Dresd:nf. . '
3(*;ilto' attadied procedure has been prcepte It is requested 'J ' l" .
*b;d nnel who are,. '- i Qe ~i"in producing satistsetory bly.
l tack welds with i
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.. a '.hand . , , , .... held torch
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.?J .3.*.:... respansibic for reactor vessel interna assam .
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. <.c.d .) "g . .,It is now felt that the use of this procedure
.. is unndstory .
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. o n=..? ,.. lsck wo.lds are satisfactory.
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n ( ,*,*,r I . 1.Lulrent_ Setup and 1.*cid Qus11flestion for Dry Tach , , . ' Welding o
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- on ifresden. .Jiiad-(.a tics, '4t ilstone aied Pilgru:1 Jct Pumrrs
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.: 3 Jet Pun; Stud SocFet 117C3701P2 *
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g v. .. - 117C3903P1 ' 1-5 a
- Pcncil Torch' ' *
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i,[,.'*],'* Jet Purp kestraincr Stud Weld Jet Punp Stud nic1d Gage 117C4090P1 l'
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158B7735P1 .., .. f, g-lT.*../.,. Gage 7311i989G1 or 117C.1029C1 ., ~.'h Weld @slification Fixturc . .
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f l** ;pical-arc welding machluc capsbic of deliverinq 150 Jeps of' IC SP cur
*' Airco Model AC-DC licliwelder 3A/DDR-22411PA/B-D or '
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remote coittrol contractor. [.(/* " * . cqual. Pure welding gas supply of argon or arCon - 25% helium through a pressure.
. i-
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- s. . ;.. and flow regulator. . ..-
- I. g p, htop Watch 0 60 secs. * *
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'. 9' ." .* 'S.,..ongue Wrench 0-350 ft.-1bs. 3/4" drive.
;Q. ': ti" Stect kule
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,7,'40"11111 Bus'tard Flat File. * *
'. . ,1 A *. .,3.':i.d Cal. pall Iull of C1can tiemincralized Water. ,
scale, Columbia Manufacturing Co. or . equal. . ,
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p.:r... .1.;...: ry ,.,. R ;.g . :.?. I SE' /.".i. . Assemble, a.ll of..tiie abosc e.quipment at the reactor r .
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- 1. . .. .
l flange leiel. . vesse I D.'c. :. . mom,than. 'onepistfom. je. .t' For ptrap is D .:>.. .
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tso. l. ding /. .' .
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.T, aschi.nc .dinctly '. .on the service Owch out . thel.,:
one pop,, . q the s . . , j.[...'placed . in t!m drywell' arcs adjacent to the pump to be welded. . . . .; .
*)l.' s:
' equipa.cnt and .. u wir' the machino todthe .
closest svallabic c1cetiica grind trunested' conc points. . ' . .i t J.l ..', 'n.Tt:tsin'1/16" tund.ien, 2t thoristed .cicetrodes an . i Ec fist.tip of. th.e point simuld. he .r . *.- I; ,',rl, .. .
.? 7in
.. ' .on..csch .. cnd of about 3'3". Iong pieces. Assemble the 1/16 co11ct -
. g the
( ,about.5-10 alls . .ih diameter. . (A f4L cup specia.lly . i. - l
' .2 .'.'.
- $..* '.'. insert. the electrode and mount the f4}. ce Tighten the collet, using 6" senic, provide ~ a ', .
.i.,..'" taction during handling). .
,,5
. . Connect the power lead end of the 50 ft. long ,ft, , , '*., ,
)
.y4.3/16"electrodeprotrusion. .i 1
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.',. torch 1.csd directly to the welding machine; csblo lengths longer
^ .
E,: than
' .l ;
%g %....,. willi,csult iii . loss of AC' high frequency and poor starting
.,l:charac.l
. g[,'c,[' Connect the rc.siulated welding gas sgply to the torch
.. .a power.s
;.. s. t.:. I"..sme fea.ture on tho' vessel to drywell sesi arcs to. .gramd 1
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.);.t"?'.:/,an.d provido a minimas length ground cabic.15 feet marimm. .Mrcugh
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sted. !' '.; E. '
- 1. ,h.p, bej,; of tothe,above setup and the a.r.e subsequ s
taken. ins.ure.that the. setuni elding conditions exac. tly .d
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