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{{#Wiki_filter:-____ | {{#Wiki_filter:-____ | ||
: 1. Abnormal Occurrence Report No. | : 1. Abnormal Occurrence Report No. | ||
50-313/74-11A | 50-313/74-11A | ||
| Line 27: | Line 23: | ||
: 4. Facility: | : 4. Facility: | ||
Arkansas Nuclear One-Unit 1 Russellville, Arkansas | Arkansas Nuclear One-Unit 1 Russellville, Arkansas | ||
. S. Identification of Occurrence: | . S. Identification of Occurrence: | ||
See AOR 50-313/74-11 dated 11/18/74 | See AOR 50-313/74-11 dated 11/18/74 | ||
: 6. Cond_itions Prior to Occurrence: | : 6. Cond_itions Prior to Occurrence: | ||
Steady-State Power Reactor Power o NWth Hot Standby Net. Output | Steady-State Power Reactor Power o NWth Hot Standby Net. Output 0 MWe Cold Shutdown x Percent of Full Power 0 % | ||
Refueling Shutdown Routine Startup Operation Routine Shutdown Operation ~ . | |||
0 MWe Cold Shutdown x Percent of Full Power 0 % | |||
Refueling Shutdown | |||
Routine Startup Operation Routine Shutdown Operation ~ . | |||
Load Changes During Routine Power Operation " . | Load Changes During Routine Power Operation " . | ||
Other (Specify) | Other (Specify) | ||
: 7. Description of Occurrence: - | : 7. Description of Occurrence: - | ||
.3 See AOR 50-313/74-11 | .3 See AOR 50-313/74-11 s | ||
s | |||
%./ | %./ | ||
8004170 July 5, 1974 , | 8004170 July 5, 1974 , | ||
NSP-10, Rev. O Page 1 of 3 | NSP-10, Rev. O Page 1 of 3 | ||
_ _ , _ _ , - _ , . . - - . , , - < v '*- *~ ~ " ' ' ' | _ _ , _ _ , - _ , . . - - . , , - < v '*- *~ ~ " ' ' ' | ||
?: . . | ?: . . | ||
'~% . . | '~% . . | ||
v I | v I | ||
Abnormal Occurrence Report No. S0-313/74-11A Sheet 2 | Abnormal Occurrence Report No. S0-313/74-11A Sheet 2 | ||
: 8. Designation of Apparent Cause of Occurrence: | : 8. Designation of Apparent Cause of Occurrence: | ||
Design Procedure | Design Procedure Manufacture Unusual Service Condition Including Installation / Environmental Construction Component Failure Operator ! | ||
Manufacture Unusual Service | |||
Condition Including Installation / Environmental Construction Component Failure Operator ! | |||
Other (Specify) X | Other (Specify) X | ||
"~ | "~ | ||
\ | \ | ||
Not determined at this time. See attached report. l | Not determined at this time. See attached report. l | ||
; | ; | ||
i | i | ||
: 9. Analysis of Occurrence: ! | : 9. Analysis of Occurrence: ! | ||
See attached report. - | See attached report. - | ||
i | i | ||
? | ? | ||
: 10. Corrective Action: | : 10. Corrective Action: | ||
See attached repart. 2 | See attached repart. 2 | ||
; | ; | ||
"N . | "N . | ||
s_ / | s_ / | ||
i | i | ||
} July S, 1974 NSP-l'D, Rev. O Page 2 of 3 l | |||
} July S, 1974 NSP-l'D, Rev. O | |||
, - - - ~ - -- - | , - - - ~ - -- - | ||
m . | m . | ||
) . | ) . | ||
Abnormal Occurrence Report No. 50-313/74-11A Sheet 3 | Abnormal Occurrence Report No. 50-313/74-11A Sheet 3 | ||
: 11. Failure Data: | : 11. Failure Data: | ||
See AOR 50-313/74-11 | See AOR 50-313/74-11 | ||
: 12. Reviews and Approvals: ! | : 12. Reviews and Approvals: ! | ||
' ; | ' ; | ||
Reviewed and Approved by: Plant Cafety Committee Yes (X) No ( ) | Reviewed and Approved by: Plant Cafety Committee Yes (X) No ( ) | ||
| Line 140: | Line 74: | ||
==Reference:== | ==Reference:== | ||
JNA-825 Yes (X) No ( ) | JNA-825 Yes (X) No ( ) | ||
Date: 1/29/75 | Date: 1/29/75 Reviewed by: /)e # Date: 7 | ||
Reviewed by: /)e # Date: 7 | |||
' J' | ' J' | ||
/ Licensing' Supervisor / | / Licensing' Supervisor / | ||
| Line 149: | Line 81: | ||
~ | ~ | ||
ihee ' | ihee ' | ||
Approved by: q)~ M [ Date: O 3 [ | Approved by: q)~ M [ Date: O 3 [ | ||
h nager of Nuc, lear Ser M s ' / | h nager of Nuc, lear Ser M s ' / | ||
Approved by: .///lrEs '- | Approved by: .///lrEs '- | ||
si i ./ Date: S ~ *l .7 \ | si i ./ Date: S ~ *l .7 \ | ||
/ | / | ||
Director of Power Production' l | Director of Power Production' l | ||
Approved by: . . - | Approved by: . . - | ||
. /$ e d- ' | . /$ e d- ' | ||
Date: 7-Y'74 3 | Date: 7-Y'74 3 | ||
,j Senior Vice Pre'sident D . | |||
,j Senior Vice Pre'sident | |||
D . | |||
l - | l - | ||
l .. | l .. | ||
| Line 176: | Line 96: | ||
. July S, 1974 NSP-10, Rev. O Page 3 of 3 * | . July S, 1974 NSP-10, Rev. O Page 3 of 3 * | ||
. 1 P) | . 1 P) | ||
~. - | ~. - | ||
' ATTAClefENT TO AOR 50 313/74-11A | ' ATTAClefENT TO AOR 50 313/74-11A On November 7,1974, a leak was discovered in a Reactor Building Spray System pipe of Arkansas Nuclear One-Unit ,1. The plant was being shut down following hot functional test of the primary coolant drain line, and was going into decay heat mode at the time the leak was detected. | ||
On November 7,1974, a leak was discovered in a Reactor Building Spray System pipe of Arkansas Nuclear One-Unit ,1. The plant was being shut down following hot functional test of the primary coolant drain line, and was going into decay heat mode at the time the leak was detected. | |||
The leak was located adjacent to a weld in line HCB-6-1. A segment of the system, including the leak, was replaced and the plant returned to operation. On November 13 a second leak was detected adjacent to a new weld which was made in.the original pipe as part of the original repair. | The leak was located adjacent to a weld in line HCB-6-1. A segment of the system, including the leak, was replaced and the plant returned to operation. On November 13 a second leak was detected adjacent to a new weld which was made in.the original pipe as part of the original repair. | ||
Subsequent leaks were also discovered in the spray pumps suction cross-over line between valves BW7A and BW7B. These leaks (labeled #3, #4 and #5 in this report) were not considered to be abnormal occurrences since that section of the pipe is isolated under normal modes required -- | |||
Subsequent leaks were also discovered in the spray pumps suction cross- | for spray system operation. Leak #4 was found in the weld made for the repair. of leak #3. Figure 1 is a simplified isometric showing the loca-tion of the first 4 leaks and figure 2 of leak #5. Samples of the pipe containing each of the first three pipe leaks have been forwarded to Bechtel's Materials, Fabrication .and Quality Control Services Laboratory for Metallurgical Analysis. | ||
over line between valves BW7A and BW7B. These leaks (labeled #3, #4 | |||
and #5 in this report) were not considered to be abnormal occurrences since that section of the pipe is isolated under normal modes required -- | |||
for spray system operation. Leak #4 was found in the weld made for the repair. of leak #3. Figure 1 is a simplified isometric showing the loca-tion of the first 4 leaks and figure 2 of leak #5. Samples of the pipe | |||
containing each of the first three pipe leaks have been forwarded to Bechtel's Materials, Fabrication .and Quality Control Services Laboratory for Metallurgical Analysis. | |||
The following discussion describes the investigations made to date and the results. All failures except ' cracks #4 and #5 have been repaired by ' | The following discussion describes the investigations made to date and the results. All failures except ' cracks #4 and #5 have been repaired by ' | ||
replacing a section of.the pipe. Cracks #4 and #5 have not been repaired | replacing a section of.the pipe. Cracks #4 and #5 have not been repaired | ||
| Line 199: | Line 107: | ||
have been made to eliminate this line. The crossover line is currently | have been made to eliminate this line. The crossover line is currently | ||
, isolated. ' | , isolated. ' | ||
Upon examination, the three leaking pipe sections showed very similar crack morphologies. All three exhibited intergranular cracking roughly | Upon examination, the three leaking pipe sections showed very similar crack morphologies. All three exhibited intergranular cracking roughly parallel to circumferential butt welds in the continuous sensitized 3: | ||
parallel to circumferential butt welds in the continuous sensitized 3: | |||
region of the Heat Affected Zone (HAZ). In all cases the cracking began | region of the Heat Affected Zone (HAZ). In all cases the cracking began | ||
; on ID surfaces, approximately 1/4 inch from the root of the weld. The 9, microstructure of the pipe showed carbide precipitation. Both surfaces - | ; on ID surfaces, approximately 1/4 inch from the root of the weld. The 9, microstructure of the pipe showed carbide precipitation. Both surfaces - | ||
l exhibited a continuous network of intergranular attack approximately j 0.001 inch deep. | l exhibited a continuous network of intergranular attack approximately j 0.001 inch deep. | ||
Intergranular stress-assisted corrosion cracks (IGSACC) of -TP-304 stain- 2l 1ess steels-at temperatures near atmospheric ambient are rare. Very j specific conditions and chemical specie. are generally required to provide ! | |||
Intergranular stress-assisted corrosion cracks (IGSACC) of -TP-304 stain- 2l | IGSACC in sensitized TP-304 at ambient temperature. Sensitized stainless ' | ||
.s teels are. susceptible to IGSACC in nitric, sulphuric, phosphoric, hydro- ~ l chloric, hydrofluoric and naphthenic acids, in addition to certain ratios | |||
.s teels are. susceptible to IGSACC in nitric, sulphuric, phosphoric, hydro- ~ l | |||
chloric, hydrofluoric and naphthenic acids, in addition to certain ratios | |||
~ | ~ | ||
~ | ~ | ||
| Line 220: | Line 121: | ||
! i | ! i | ||
, N. | , N. | ||
"e 6 | "e 6 | ||
9 | 9 | ||
| Line 232: | Line 132: | ||
The various factors in this investigation are discussed below with an estimation of their probable effect in the cracking of pipe sections. | The various factors in this investigation are discussed below with an estimation of their probable effect in the cracking of pipe sections. | ||
: 1. Pipe bhterial: | : 1. Pipe bhterial: | ||
The piping material is ASTM A-3S8, TP-304. By specification, | The piping material is ASTM A-3S8, TP-304. By specification, "all pipe shall be furnished in the heat treated condition. | ||
The heat treatment procedure shall consist of heating the material to a minimum of 1900*F and quenching in water or rapidly cooling by other means." Extensive microstructural examination of the cracked pipe sections revealed some sensitization. The ' | The heat treatment procedure shall consist of heating the material to a minimum of 1900*F and quenching in water or rapidly cooling by other means." Extensive microstructural examination of the cracked pipe sections revealed some sensitization. The ' | ||
heat treat condition is a significant contributor to the inter- ,, | heat treat condition is a significant contributor to the inter- ,, | ||
| Line 243: | Line 141: | ||
: 2. Stress: | : 2. Stress: | ||
It is assumed that the stress component for IGSACC was due to fit-up and welding because the cracking observed has all been near > | It is assumed that the stress component for IGSACC was due to fit-up and welding because the cracking observed has all been near > | ||
welds, | welds, s | ||
s | |||
: 3. Water Chemistry: | : 3. Water Chemistry: | ||
The chemistry of the water to which the piping was exposed during normal operation and prior to failure will be presented in our ~ | The chemistry of the water to which the piping was exposed during normal operation and prior to failure will be presented in our ~ | ||
| Line 251: | Line 147: | ||
final report. The fluid is primar'ily borated water of varying concentrations . | final report. The fluid is primar'ily borated water of varying concentrations . | ||
The investigations included visual observations, microstructural examina-tions, sca'nning electron microscope examination of fracture surface and chemical analysis. | The investigations included visual observations, microstructural examina-tions, sca'nning electron microscope examination of fracture surface and chemical analysis. | ||
The results of the investigations are summarized here without reference to specific photomacrographs or photomicrographs. A pictorial review of the three cracks is presented in Appendices 1, 2 and 3. The photomacro- | The results of the investigations are summarized here without reference to specific photomacrographs or photomicrographs. A pictorial review of the three cracks is presented in Appendices 1, 2 and 3. The photomacro- | ||
,_ graphs and photomicrographs of the appendices are supported by commentary. | ,_ graphs and photomicrographs of the appendices are supported by commentary. | ||
v) - | v) - | ||
~ | ~ | ||
' (3 | ' (3 | ||
: 1. Visual Observations: | : 1. Visual Observations: | ||
The three pipe sections which leaked were examined visually with - | The three pipe sections which leaked were examined visually with - | ||
| Line 274: | Line 164: | ||
: 2. Microstructural Analysis: ' | : 2. Microstructural Analysis: ' | ||
Cross sections of all cracks and pipe base metal away from the circumferential welds were examined on a metallurgical micro-scope with magnifications up to 1000X., The results were very similar for all three pipe sections examined. | Cross sections of all cracks and pipe base metal away from the circumferential welds were examined on a metallurgical micro-scope with magnifications up to 1000X., The results were very similar for all three pipe sections examined. | ||
: a. He cracks originated on the ID surfaces and progressed | : a. He cracks originated on the ID surfaces and progressed | ||
.1 through the pipe thickness in an intergranular manner, s here was no evidence of transgranular or mixed mode cracking. | .1 through the pipe thickness in an intergranular manner, s here was no evidence of transgranular or mixed mode cracking. | ||
| Line 280: | Line 169: | ||
tinuous carbide precipitation at the grain boundaries. ~ | tinuous carbide precipitation at the grain boundaries. ~ | ||
: c. The cracking was branched with secondary cracking. | : c. The cracking was branched with secondary cracking. | ||
: d. . De weld appeared sound with no suggestion of any object-ionable features. | : d. . De weld appeared sound with no suggestion of any object-ionable features. | ||
: c. The longitudinal welds on all pipe sections appear to have been solution treated after planishing. H ere was no evi-dence of a heat-affected zone near these welds. | : c. The longitudinal welds on all pipe sections appear to have been solution treated after planishing. H ere was no evi-dence of a heat-affected zone near these welds. | ||
m | m | ||
~ | ~ | ||
[,- ~\ , | [,- ~\ , | ||
s_/m | s_/m | ||
: f. The base metal of all pipo sections contained continuous and semi-continuous carbide precipitation at the grain boundaries, indicating an inadequate cooling rate from the solution heat treating temperature. The carbide precipita-tion was heavier in the center of the pipe thickness than at either' surface. | : f. The base metal of all pipo sections contained continuous and semi-continuous carbide precipitation at the grain boundaries, indicating an inadequate cooling rate from the solution heat treating temperature. The carbide precipita-tion was heavier in the center of the pipe thickness than at either' surface. | ||
-g. On both ID and OD surfaces throughout the pipe lengths, there was a network of intergranular attack at the grain boundaries. This intergranular attack extended to a depth of 0.001 to 0.002 inch. This attack was most probably caused by pickling subsequent to heat treating. | -g. On both ID and OD surfaces throughout the pipe lengths, there was a network of intergranular attack at the grain boundaries. This intergranular attack extended to a depth of 0.001 to 0.002 inch. This attack was most probably caused by pickling subsequent to heat treating. | ||
: 3. Fractog'raphic Analysis: | : 3. Fractog'raphic Analysis: | ||
| Line 319: | Line 196: | ||
i spray and' decay-heat systems was examined by ultrasonic and ' | i spray and' decay-heat systems was examined by ultrasonic and ' | ||
! radiographic methods. Of these areas, five showed crack-like - | ! radiographic methods. Of these areas, five showed crack-like - | ||
indications in the radiographs. It was concluded that ultrasonic | indications in the radiographs. It was concluded that ultrasonic testing was not a satisfactory method of examining pipe for the suspected defect and that radiography was the more satisfactory method of examination. | ||
testing was not a satisfactory method of examining pipe for the suspected defect and that radiography was the more satisfactory method of examination. | |||
O) t s_ - | O) t s_ - | ||
~ | ~ | ||
,-g.,, - - , | ,-g.,, - - , | ||
.A, w | .A, w | ||
O- | O- | ||
: 5) ' | : 5) ' | ||
The following work remains to be done: | The following work remains to be done: | ||
: 1. Obtain a chemical analysis of water samples and crud from the system. | : 1. Obtain a chemical analysis of water samples and crud from the system. | ||
| Line 338: | Line 209: | ||
: 3. Field investigation of all schedule 10 stainless steel piping to identify pipe with excessive pickling attack. | : 3. Field investigation of all schedule 10 stainless steel piping to identify pipe with excessive pickling attack. | ||
: 4. Metallurgical examination of cracks #4 and #5 and RT indications f'ollowing removal of crossover pipe. | : 4. Metallurgical examination of cracks #4 and #5 and RT indications f'ollowing removal of crossover pipe. | ||
Item 1. has been delayed due to non-availability of legal shipping con- ~~ | Item 1. has been delayed due to non-availability of legal shipping con- ~~ | ||
tainers. No date is available for completion. Items 2. through 4. depend on removal of the section of crossover pipe. This removal will be accom-plished during a planned shutdown in the spring of this year. The exact date of the planned shutdown is not yet known. | tainers. No date is available for completion. Items 2. through 4. depend on removal of the section of crossover pipe. This removal will be accom-plished during a planned shutdown in the spring of this year. The exact date of the planned shutdown is not yet known. | ||
| Line 347: | Line 217: | ||
: c. Establish a program to examine, in the field, pipe surface con- | : c. Establish a program to examine, in the field, pipe surface con- | ||
. ditions to identify pipe that has. experienced chemical attack l due to excessive pickling; - | . ditions to identify pipe that has. experienced chemical attack l due to excessive pickling; - | ||
: d. Perform an independent metallurgical examination of cracks #4 and , | : d. Perform an independent metallurgical examination of cracks #4 and , | ||
#5 and RT indications following removal of the crossover pipe | #5 and RT indications following removal of the crossover pipe l | ||
l | |||
: e. Examination of the surface of the pipe in the field for carbide l precipitation by a surface replica technique; _ | : e. Examination of the surface of the pipe in the field for carbide l precipitation by a surface replica technique; _ | ||
1 | 1 | ||
| Line 357: | Line 224: | ||
Item c has been completed. Our review of the program has not been com- ' | Item c has been completed. Our review of the program has not been com- ' | ||
pleted at this time. The other items depend.on the planned shutdown this spring. | pleted at this time. The other items depend.on the planned shutdown this spring. | ||
In the interim, we have increased our surveillance of this system to I include a once-a-shift walk thorough examination for leaks. | In the interim, we have increased our surveillance of this system to I include a once-a-shift walk thorough examination for leaks. | ||
Final results, conclusions and corrective action will be reported when all investigations are complete. The schedule for this final report necessarily f( ,)s depends on the planned spring shutdown for which an exact date is impossible to determine at this time. | Final results, conclusions and corrective action will be reported when all investigations are complete. The schedule for this final report necessarily f( ,)s depends on the planned spring shutdown for which an exact date is impossible to determine at this time. | ||
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i. | |||
l APPENDICES Appendix 1 is a pictorial review of crack #1. Cracks #2 and #3 are similar | l APPENDICES Appendix 1 is a pictorial review of crack #1. Cracks #2 and #3 are similar | ||
~ | ~ | ||
i j to crack #1. Appendicias 2 and 3 are a pictorial documentation to show i this similarity. The Meta 11ographic examination confirmed the Morphology j, of the cracks to be identical in nature. | i j to crack #1. Appendicias 2 and 3 are a pictorial documentation to show i this similarity. The Meta 11ographic examination confirmed the Morphology j, of the cracks to be identical in nature. | ||
; | ; | ||
i | i I | ||
f t | |||
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1 1 | 1 1 | ||
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| Line 674: | Line 381: | ||
f. | f. | ||
3 | 3 | ||
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' - . 6- | |||
i | |||
-- ,. v+.--myw yy--e-y ,- ,w.-iym -n----- , . , . - - . - - ..yy_y. - - , yw.w--. ,. , . . . _ ,_m.. , , _ . - - ,m,,... cms.w-,wrm,c..r,-w,- | -- ,. v+.--myw yy--e-y ,- ,w.-iym -n----- , . , . - - . - - ..yy_y. - - , yw.w--. ,. , . . . _ ,_m.. , , _ . - - ,m,,... cms.w-,wrm,c..r,-w,- | ||
I i | I i | ||
1 | 1 i | ||
l l APPENDIX 1 PICTORIAL REVIDV OF CRACK No. t . | |||
l t | l t | ||
i E | i E | ||
m | m | ||
--- - - - - - - , -m-wg-,em- r-,w.p-,,v m ,- w r py,,yp-- m ,w w -w e , wwpww ww pp - | --- - - - - - - , -m-wg-,em- r-,w.p-,,v m ,- w r py,,yp-- m ,w w -w e , wwpww ww pp - | ||
BLN 1174-8 | BLN 1174-8 | ||
_[ | _[ | ||
-+ - | -+ - | ||
| Line 706: | Line 398: | ||
~ | ~ | ||
,[ | ,[ | ||
q__ _% M:_juz. | |||
<pv = | <pv = | ||
. ..;., | . ..;., | ||
~- | ~- | ||
~%. | ~%. | ||
s- | s- | ||
_ 4p _ _ , %; :. | _ 4p _ _ , %; :. | ||
l | l | ||
, ' '.i . .. . , . 3h e k. | , ' '.i . .. . , . 3h e k. | ||
(a) v l l | (a) v l l | ||
(b) | (b) | ||
* \ | * \ | ||
l | l 1 | ||
l (c) -l l Sample No. 1 Fig. 1-1 (a) The failed end of sample No. 1 with cracks marked by the arrow. | |||
(c) -l l Sample No. 1 Fig. 1-1 (a) The failed end of sample No. 1 with cracks marked by the arrow. | |||
( | ( | ||
(b) The inside surface of the crack area. | (b) The inside surface of the crack area. | ||
(c) The outside surface of the crack area. | (c) The outside surface of the crack area. | ||
BLN 1174-8 m s l | |||
BLN 1174-8 | |||
l 1 | l 1 | ||
I | I | ||
.p c | .p c | ||
- r. e. w j ., ,$ ,- | - r. e. w j ., ,$ ,- | ||
g | g | ||
.~...,-y>,.. | .~...,-y>,.. | ||
r; v.e.. | r; v.e.. | ||
..-; _:) | ..-; _:) | ||
*g . y . *, 'w e - | *g . y . *, 'w e - | ||
* I | * I | ||
<.. 9', j | <.. 9', j | ||
.p ....tI ' , . . . . -- | .p ....tI ' , . . . . -- | ||
.; | .; | ||
;. | ;. | ||
.- .. N:. | .- .. N:. | ||
,- .4.I - | ,- .4.I - | ||
Om .! | Om .! | ||
' A hrY Wh' f' .'7i *..>.. | |||
' A hrY | |||
Wh' | |||
f' .'7i *..>.. | |||
*pw' .;4. | *pw' .;4. | ||
,+; c. 8 . .- . . . | ,+; c. 8 . .- . . . | ||
. . .T c | . . .T c | ||
~ | ~ | ||
.?*i!p .* * . | .?*i!p .* * . | ||
,. :. , : w .. , . t :t %, C | ,. :. , : w .. , . t :t %, C | ||
.,3* '. | .,3* '. | ||
~%& | ~%& | ||
| Line 805: | Line 448: | ||
.s | .s | ||
. = n. .-w--. .- ...--: : .., .. _ : - <WW. - ,w 4 q j .;, w* -~*. | . = n. .-w--. .- ...--: : .., .. _ : - <WW. - ,w 4 q j .;, w* -~*. | ||
% y. . | % y. . | ||
I n.-=-5***- .' . . | I n.-=-5***- .' . . | ||
' ' " ' ~ | ' ' " ' ~ | ||
K.iQ gn .: , ...- ..__',.['. | K.iQ gn .: , ...- ..__',.['. | ||
7 | 7 | ||
. ~...._ | . ~...._ | ||
.y | .y vr-s W N .e .- | ||
vr-s W N .e .- | |||
a., Q= g-s . . | a., Q= g-s . . | ||
p | p | ||
- # .tgr , | - # .tgr , | ||
, =: . . . , . | , =: . . . , . | ||
.s ,_,. y,a.w,.. | .s ,_,. y,a.w,.. | ||
.. :. - .. -N-. | .. :. - .. -N-. | ||
.- e- . | .- e- . | ||
;&.h .- | ;&.h .- | ||
; rd_.g.. ,,,, 4-m .- -.m | ; rd_.g.. ,,,, 4-m .- -.m | ||
.~.- | .~.- | ||
| Line 839: | Line 468: | ||
. . ~ .. .; ~. 4 s . r- r.y sg ~ .y | . . ~ .. .; ~. 4 s . r- r.y sg ~ .y | ||
: e | : e | ||
= .--. . m .,-..'-tcr, W q,; ;m ~.% p.s; f .sl f 4w rg. | |||
= .--. . m .,-..'-tcr, W q,; ;m ~.% p.s; f .sl f | r u-~. | ||
4w rg. | |||
r | |||
u-~. | |||
s- ~. ..w- , .w.: v . . . _. _. : .. | s- ~. ..w- , .w.: v . . . _. _. : .. | ||
: r r -s-- w? t | : r r -s-- w? t | ||
__ ny. .;._ ir.:_3. r d* WJ tw w =.; . x.p+[%g:*> | __ ny. .;._ ir.:_3. r d* WJ tw w =.; . x.p+[%g:*> | ||
.- r pQ=M-aM % -;*.~ '.. -%;**i-Ai ;- - | .- r pQ=M-aM % -;*.~ '.. -%;**i-Ai ;- - | ||
4 % L. - | 4 % L. - | ||
J-# | J-# | ||
g&g&:GM-- g M=--. .y .v.~ :::::-?W$. Y - | g&g&:GM-- g M=--. .y .v.~ :::::-?W$. Y - | ||
g : | g : | ||
m A - | m A - | ||
; | ; | ||
(b) Outside Surface 10X , | (b) Outside Surface 10X , | ||
Sample No. 1 | Sample No. 1 | ||
. Fig. 1-2 Closeup views of the inside and outside surfaces showing the crack marked by the arrows in Fig.1-1 (b) and (c) . | . Fig. 1-2 Closeup views of the inside and outside surfaces showing the crack marked by the arrows in Fig.1-1 (b) and (c) . | ||
N | N I | ||
I | |||
A BLN 1174-6 r~~- . ..,ytX , | A BLN 1174-6 r~~- . ..,ytX , | ||
~ . ~~ | ~ . ~~ | ||
F+ | F+ | ||
:ge' ~; s;.. | :ge' ~; s;.. | ||
~. - , , ~ , .: | ~. - , , ~ , .: | ||
% 1 12 | % 1 12 | ||
.O : | .O : | ||
| Line 888: | Line 497: | ||
.;7- 97r | .;7- 97r | ||
. . ,; U ' ,. | . . ,; U ' ,. | ||
. it l | . it l | ||
1 | 1 | ||
| Line 897: | Line 504: | ||
* '' ' aun o., | * '' ' aun o., | ||
' o , e ';(/ | ' o , e ';(/ | ||
- .w n L | - .w n L (a) Cracked side | ||
(a) Cracked side | |||
;y< ,. | ;y< ,. | ||
5gg ,4 - ~ . ~ ~ ' . ./'" h,,,,xf i | 5gg ,4 - ~ . ~ ~ ' . ./'" h,,,,xf i | ||
,$ie"0.'ET.% ,, .,A n % , | ,$ie"0.'ET.% ,, .,A n % , | ||
.i* | .i* | ||
.Ac-r.4. %a:m9.j A gg | .Ac-r.4. %a:m9.j A gg | ||
-.tm. <i | -.tm. <i | ||
- =. | - =. | ||
| Line 912: | Line 515: | ||
_;sm, . 'yg . g | _;sm, . 'yg . g | ||
, ,, e , N.ea.,.s, g | , ,, e , N.ea.,.s, g | ||
(b) Top view of the cracked region M4 e . | |||
(b) Top view of the cracked region | |||
M4 | |||
e | |||
. . . , , # . . . ',1,)' .' 7' 7 ~ s | . . . , , # . . . ',1,)' .' 7' 7 ~ s | ||
-" ,.,): ess 3 m; ? | |||
-" ,.,): ess | |||
3 m; ? | |||
v s. | v s. | ||
+ Y;; 'L | + Y;; 'L D As a "..<,- | ||
D As a "..<,- | |||
e ,j,9.ik$ip,?iE', 4f | e ,j,9.ik$ip,?iE', 4f | ||
.l y .r~ w l h ., ;fh ., ' | .l y .r~ w l h ., ;fh ., ' | ||
$hh" Or ; r. 4 | $hh" Or ; r. 4 | ||
, .c . . . | , .c . . . | ||
Y. ,.. s s k Y.:S. . *.d - . | Y. ,.. s s k Y.:S. . *.d - . | ||
(c) Opposite side - | (c) Opposite side - | ||
Sample No. 1 r . Fig. 1-3 (a) The crack on the outside surface. | Sample No. 1 r . Fig. 1-3 (a) The crack on the outside surface. | ||
| Line 942: | Line 531: | ||
~ | ~ | ||
about the same extent as in (b). | about the same extent as in (b). | ||
BLN 1174-8 | BLN 1174-8 | ||
- , '~~ J.'.u . . _ - .-- - - - - - ~ .-... | - , '~~ J.'.u . . _ - .-- - - - - - ~ .-... | ||
I_'' ,._. | I_'' ,._. | ||
geg m x% | geg m x% | ||
(.,. | (.,. | ||
,. ~ ~ , | ,. ~ ~ , | ||
w , | w , | ||
h | h | ||
,4;. lb , | ,4;. lb , | ||
| Line 967: | Line 544: | ||
* EY s : | * EY s : | ||
10 f N | 10 f N | ||
.(i,- e. ; | .(i,- e. ; | ||
%. i. l | %. i. l | ||
, ' % s I, | , ' % s I, | ||
.I \ | .I \ | ||
*l.' - | *l.' - | ||
| Line 983: | Line 553: | ||
l ,- h e | l ,- h e | ||
../ | ../ | ||
/ N 1- - | / N 1- - | ||
s | s | ||
.s ' | .s ' | ||
I l | I l | ||
. . . . J, - ' ,2 ! | . . . . J, - ' ,2 ! | ||
~ ':. ). - | ~ ':. ). - | ||
~ | ~ | ||
T ~# ., _ . . ./ - | T ~# ., _ . . ./ - | ||
. p$gs. g .,3 g ' | . p$gs. g .,3 g ' | ||
g% | g% | ||
. g~~-:- . | . g~~-:- . | ||
i | i | ||
~ | ~ | ||
~. , | ~. , | ||
- y4 ' I l ~. . | - y4 ' I l ~. . | ||
1 (Metwkhe | 1 (Metwkhe i | ||
t I | |||
I | |||
~ | ~ | ||
l' | l' I-ll3 | ||
I-ll3 | |||
/:. , | /:. , | ||
-.I]% . . .f'- | -.I]% . . .f'- | ||
// | // | ||
_/ . | _/ . | ||
1 | 1 | ||
-~ | -~ | ||
:'N' ..- | :'N' ..- | ||
( | ( | ||
| Line 1,049: | Line 585: | ||
4 | 4 | ||
\ 11 ..- , | \ 11 ..- , | ||
Sample go, 1 d Fig | Sample go, 1 d Fig | ||
* l-4 A sketch showing th 8 I D8 of metallographic specimens. | * l-4 A sketch showing th 8 I D8 of metallographic specimens. | ||
y--- - - _ ~ # .. m,, -,--,.m.- c . , - , ,,,,,,.-.we ,._,,s,,,,,wn,w,-..,-w --m-...wy --yw--e | y--- - - _ ~ # .. m,, -,--,.m.- c . , - , ,,,,,,.-.we ,._,,s,,,,,wn,w,-..,-w --m-...wy --yw--e | ||
b i | b i | ||
i | i 1 , | ||
1 1 | |||
1 , | |||
1 | |||
1 | |||
i i | i i | ||
I | i I | ||
N i | N i | ||
i b .,,1 * ' i I | i b .,,1 * ' i I | ||
g~. | g~. | ||
~ [-9 , ?)j=f.qyp;EtNlll1:il,1[. | ~ [-9 , ?)j=f.qyp;EtNlll1:il,1[. | ||
- ~ . , . | - ~ . , . | ||
. 4 g. ; , y . aCg_yy. .. | . 4 g. ; , y . aCg_yy. .. | ||
jQBe ., ._ f> i. .l,n | jQBe ., ._ f> i. .l,n | ||
[y, e | [y, e | ||
[ r.y. | [ r.y. | ||
, wi. , | , wi. , | ||
-~ v g ;j- | -~ v g ;j-n-; | ||
n-; | |||
q. | q. | ||
i ; y l. e yK, j -- jp.; | i ; y l. e yK, j -- jp.; | ||
| Line 1,093: | Line 610: | ||
r~ a | r~ a | ||
. ~ . . | . ~ . . | ||
./..n. . . . | ./..n. . . . | ||
g,cj | g,cj | ||
- e ~c; ,,i*" | - e ~c; ,,i*" | ||
f g - | f g - | ||
h: | h: | ||
ww. . | ww. . | ||
~ . . , ' ';~ a,, k, ash . %.5, - '...& n. ,n. | ~ . . , ' ';~ a,, k, ash . %.5, - '...& n. ,n. | ||
R .. . h % - q.:: 3- | R .. . h % - q.:: 3- | ||
{$ | {$ | ||
%..yr.-c;m,-e.-Ass.3,G.p n ,. - | %..yr.-c;m,-e.-Ass.3,G.p n ,. - | ||
,wwL p .v :v. .af | ,wwL p .v :v. .af | ||
~ | ~ | ||
V '- | V '- | ||
:" n '. ' | :" n '. ' | ||
n ' | n ' | ||
y y .. | |||
y | |||
y .. | |||
- i ....-...o..- | - i ....-...o..- | ||
i | i | ||
._ ,' ~ . , , | ._ ,' ~ . , , | ||
. .e. u. t . | . .e. u. t . | ||
s.: - | s.: - | ||
.+ * .a | .+ * .a | ||
.s' i XX^*J a Ls .-- ...* 5'c.n s4 a<. | |||
.s' | |||
* M- .o | * M- .o | ||
..o ..',n., ; ~d' | ..o ..',n., ; ~d' | ||
.,. . ,..~,f.,r&e.. : *. 'n | .,. . ,..~,f.,r&e.. : *. 'n w J.y.. :e~ .r.t s .*v 4 %. - | ||
w J.y.. :e~ .r.t s .*v 4 %. - | |||
i | i | ||
.i | .i | ||
| Line 1,161: | Line 646: | ||
'' , <. .. -: | '' , <. .. -: | ||
* 2..; r . ~ | * 2..; r . ~ | ||
, ,%- ,c . | , ,%- ,c . | ||
j p[d.~.3'. 9M'[ (*I.''II % ; M% W*M. 4 ' .rl: %$-hf | j p[d.~.3'. 9M'[ (*I.''II % ; M% W*M. 4 ' .rl: %$-hf | ||
| Line 1,169: | Line 652: | ||
~ | ~ | ||
.. ~ * | .. ~ * | ||
( , | ( , | ||
i' ;. : .:. w - | i' ;. : .:. w - | ||
*7.* c.- r : ' a W ;N H #. ' ~-~ :. . | *7.* c.- r : ' a W ;N H #. ' ~-~ :. . | ||
e,~.,e ,L | e,~.,e ,L | ||
| Line 1,178: | Line 659: | ||
\,g:.,g n ,*g | \,g:.,g n ,*g | ||
-: g u- K .' . - - - - n j | -: g u- K .' . - - - - n j | ||
ff, f .7 t . .a.: | ff, f .7 t . .a.: | ||
c r.. . - | c r.. . - | ||
--j,,,,, | --j,,,,, | ||
: 3. . .7 t.f g' g ;_., , | |||
: 3. . .7 | |||
t.f g' g ;_., , | |||
, s | , s | ||
\ | \ | ||
a . . . y -D= | a . . . y -D= | ||
m g-. , ..9 ;In.;-,- | m g-. , ..9 ;In.;-,- | ||
- M a :E:5.;,._.;[... ,2::: , | - M a :E:5.;,._.;[... ,2::: , | ||
=~ | =~ | ||
'' ~ | '' ~ | ||
vy ~ .g. ) | vy ~ .g. ) | ||
m, ,.'5 ,, 3 "L ", '.j " ' : - '"' | m, ,.'5 ,, 3 "L ", '.j " ' : - '"' | ||
5 | 5 | ||
] , , | ] , , | ||
$,/.. - - | $,/.. - - | ||
,; , - | ,; , - | ||
,i* . . , - , | ,i* . . , - , | ||
,"? 8 >- 9 s- ,.y | ,"? 8 >- 9 s- ,.y | ||
% , ,4 . s, s a s . ., | % , ,4 . s, s a s . ., | ||
| Line 1,222: | Line 682: | ||
' f | ' f | ||
. . . ... .a .,4 . c h ., ,. 4 3 | . . . ... .a .,4 . c h ., ,. 4 3 | ||
, i, s .. | , i, s .. | ||
., Y o | ., Y o | ||
,i c., | ,i c., | ||
3 ; ., ,; t , p g ,7. . | 3 ; ., ,; t , p g ,7. . | ||
s.v. | s.v. | ||
/ I I | / I I | ||
i | i l Electrolytic etch in 10% oxalic acid 15X l | ||
l Electrolytic etch in 10% oxalic acid 15X l | |||
l | l | ||
; | ; | ||
' Specimen No. 18 (Sample No. 1) | ' Specimen No. 18 (Sample No. 1) to Fig. 1-5 Macrograph of specimen No. 18 showing a section through the crack as marked by the line E 4 | ||
to Fig. 1-5 Macrograph of specimen No. 18 showing a section through the crack as marked by the line E 4 | |||
in Fig. 1-2 (a) and a dotted line in Fig. 1-4. Note relationship of cracking with the p | in Fig. 1-2 (a) and a dotted line in Fig. 1-4. Note relationship of cracking with the p | ||
; weld HAZ. N | ; weld HAZ. N I. I l CD | ||
I. I l CD | |||
,1 1 | ,1 1 | ||
t, f . | t, f . | ||
I | I | ||
% id W | % id W | ||
; | ; | ||
BLN 1174-8 i - | BLN 1174-8 i - | ||
l l | l l | ||
% ~ r A d L. _ . . . | |||
% ~ r A | |||
d L. _ . . . | |||
- . _ _ . . . . . -}- . - | - . _ _ . . . . . -}- . - | ||
J w - | J w - | ||
; | ; | ||
J % ; | J % ; | ||
. _ . . . . J l | . _ . . . . J l | ||
l ' | l ' | ||
) l | ) l | ||
~ | ~ | ||
\ - | \ - | ||
'[ - | '[ - | ||
- _ - . . \-- - -.. ' | - _ - . . \-- - -.. ' | ||
\ / | \ / | ||
I | I | ||
* ~ | * ~ | ||
( . . | ( . . | ||
~. . ) | ~. . ) | ||
j_ _ ' - | j_ _ ' - | ||
i | i (b) Middle 100X | ||
(b) Middle 100X | |||
\ | \ | ||
( | ( | ||
-" s | -" s | ||
; (a) Inside 100X - | ; (a) Inside 100X - | ||
l Specimen No. 18 (Sample No. 1) | l Specimen No. 18 (Sample No. 1) | ||
! Fig. 1-6 Micrographs showing the intergranular cracks marked by the arrows a and b I in Fig. 1-5. - | ! Fig. 1-6 Micrographs showing the intergranular cracks marked by the arrows a and b I in Fig. 1-5. - | ||
l | l | ||
I i | I i | ||
t 1 | |||
1; | 1; | ||
\ | \ | ||
i 1 | i 1 | ||
i ~ ~ "' _7 ' ' ', Q - | i ~ ~ "' _7 ' ' ', Q - | ||
.s. | .s. | ||
n . | n . | ||
0, . .; . / ; ,.. , - . - .,.. . | 0, . .; . / ; ,.. , - . - .,.. . | ||
| Line 1,337: | Line 743: | ||
1 | 1 | ||
.f , | .f , | ||
l | l | ||
; . | ; . | ||
r;. , | r;. , | ||
. _ , . , . . . C,s | . _ , . , . . . C,s | ||
. ~L .- - | . ~L .- - | ||
(,- | (,- | ||
.j.3 i | .j.3 i | ||
:: u. .a , _ | :: u. .a , _ | ||
~ | ~ | ||
.<.. ... '.r , | .<.. ... '.r , | ||
r | r l .. | ||
l .. | |||
j | j | ||
_. __ F_ 3-Q u 4 | |||
_. __ F_ 3- | |||
Q u | |||
4 | |||
4 . | 4 . | ||
,.,e Electrolytic etch in 10% NaCN 14X en Specimen No. 16 (Sample No. 1) s 1 H N | |||
,.,e | |||
Electrolytic etch in 10% NaCN 14X en | |||
Specimen No. 16 (Sample No. 1) | |||
s 1 H N | |||
Fig. 1-7 Macrograph of specimen No. 16 showing another section through the crack as marked by a line - | Fig. 1-7 Macrograph of specimen No. 16 showing another section through the crack as marked by a line - | ||
i in Fig. 1-4. The bottom edge is a profile of the inside surface. S | i in Fig. 1-4. The bottom edge is a profile of the inside surface. S | ||
.i | .i l | ||
i * | |||
% W f. | % W f. | ||
~ _ _ _ . ~ | ~ _ _ _ . ~ | ||
.n ,,. , | .n ,,. , | ||
,q' | ,q' BLN 1174-3 e v i | ||
BLN 1174-3 | |||
e v | |||
i | |||
:\' | :\' | ||
G C | G C | ||
o N | o N | ||
| Line 1,431: | Line 773: | ||
-w | -w | ||
* ' O c C'1 | * ' O c C'1 | ||
. - ' .o n | . - ' .o n | ||
. ... u I | . ... u I | ||
- , - i. * | - , - i. * | ||
| Line 1,439: | Line 779: | ||
; '" - - | ; '" - - | ||
gy | gy | ||
~ . % , | ~ . % , | ||
y | y | ||
-s :- 1 O .r4 | -s :- 1 O .r4 4; | ||
4; | |||
r". * %'a , | r". * %'a , | ||
: 4) a | : 4) a | ||
%< - [( .;. > .o ,, | %< - [( .;. > .o ,, | ||
j- lj,> y g | j- lj,> y g | ||
~ . . , , , | ~ . . , , , | ||
| Line 1,458: | Line 791: | ||
- ,. ~.,( a *~,,L | - ,. ~.,( a *~,,L | ||
* so e r .: a t . ' . | * so e r .: a t . ' . | ||
.:n.s - .. . . . n y l,e. :,, tA ... -- M n ..n:-1 ~ .~,4 6 | .:n.s - .. . . . n y l,e. :,, tA ... -- M n ..n:-1 ~ .~,4 6 o.., .. + * ' ' . | ||
.O Q t,~yg,' ; v g. | |||
o.., .. + * ' ' . | |||
.O Q | |||
t,~yg,' ; v g. | |||
7 ,. | 7 ,. | ||
. 4 , . | . 4 , . | ||
: 1. ?;f' | : 1. ?;f' | ||
'3 i m..' %h s W 4- y ' i-.4 er. : p" ': O sd 9?\ f 'y Np'e*-y.%[:: @- t + ,''. 71' ? | '3 i m..' %h s W 4- y ' i-.4 er. : p" ': O sd 9?\ f 'y Np'e*-y.%[:: @- t + ,''. 71' ? | ||
' N G v-d ;;."".- %n f; Q U | ' N G v-d ;;."".- %n f; Q U | ||
: 6. a,a:t 3. fiy t. R. | : 6. a,a:t 3. fiy t. R. | ||
| Line 1,480: | Line 808: | ||
W | W | ||
~.. %.,.-- | ~.. %.,.-- | ||
;. | ;. | ||
4 | 4 | ||
++ m, | ++ m, | ||
- ' ,c,*; u. .j 2. . t e. g,s. .. b,1 .- , , | - ' ,c,*; u. .j 2. . t e. g,s. .. b,1 .- , , | ||
...... , , ,p 4;.. | ...... , , ,p 4;.. | ||
'.; g9 y | '.; g9 y | ||
,y- s <'':41,n<m u.- m.,.,e.., | ,y- s <'':41,n<m u.- m.,.,e.., | ||
;L .: . k ,;4 G),k y u; _' ,.- | ;L .: . k ,;4 G),k y u; _' ,.- | ||
*m .t.a ij.- | *m .t.a ij.- | ||
W e | W e | ||
pg .*. ,'!n | pg .*. ,'!n i | ||
i | |||
,' ; y).!. ;; | ,' ; y).!. ;; | ||
'. e, | '. e, l b : * "'''"){* oo | ||
~b* . , 'lr S. ..I)? #~ j",; i '. . 4 | |||
l b : * "'''"){* oo | |||
~b* . , 'lr | |||
S. ..I)? #~ j",; i '. . 4 | |||
-1 *t | -1 *t | ||
- + 'O | - + 'O | ||
!i | !i | ||
'[ " F .} . i,d Oy | '[ " F .} . i,d Oy n -u W | ||
8"A"0 . uo | |||
n -u | |||
.n 4V m . g ., | .n 4V m . g ., | ||
' . ~ | ' . ~ | ||
.. , . t; n ,... *?, * , .J Q | |||
.. , . t; n ,... *?, * , .J | t''l * | ||
? .I i,' | ? .I i,' | ||
', +. Q* .. r g | ', +. Q* .. r g | ||
| Line 1,527: | Line 836: | ||
,i | ,i | ||
* e, s..* : | * e, s..* : | ||
Q. t r;,,. | Q. t r;,,. | ||
: 1) .4 | : 1) .4 | ||
| Line 1,537: | Line 845: | ||
M w s l | M w s l | ||
.r. | .r. | ||
* V y rJ'.Z' W(. ?y ;N oo | * V y rJ'.Z' W(. ?y ;N oo y, P . g, | ||
y, P . g, | |||
%D p -. u , ., . . | %D p -. u , ., . . | ||
M eu | M eu SqgMr e. &p N, s .*r.# 5 : r .O,;m:. | ||
SqgMr e. &p N, s .*r.# 5 : r .O,;m:. | |||
^3, v. n my syf .ce, wa 1,J | ^3, v. n my syf .ce, wa 1,J | ||
* O | * O | ||
[ , @p?j '.1 N | [ , @p?j '.1 N | ||
, %;.JJ | , %;.JJ | ||
' .;Mp J> }; | |||
' .;Mp | |||
J> }; | |||
4y Y ~L ., | 4y Y ~L ., | ||
O e 3 y.? d,. p.1 . .m:; | O e 3 y.? d,. p.1 . .m:; | ||
j 4.,, | j 4.,, | ||
w.<j.- vy- 3;A prL. ,4,3 J,j Z e w: e v. c,. .,,;3 e 'q 'W 3 a? tqw .,"S og s; | w.<j.- vy- 3;A prL. ,4,3 J,j Z e w: e v. c,. .,,;3 e 'q 'W 3 a? tqw .,"S og s; | ||
rgnap 40.N c | rgnap 40.N c w, . M.7 'e f .G;&' p-tt u .CQe4 | ||
w, . M.7 'e f .G;&' p-tt u .CQe4 | |||
.w .w * . . | .w .w * . . | ||
eo e k,9 . .s ,. ,' -Wr ''ku.- .. " , ,,< } ; .Q . | eo e k,9 . .s ,. ,' -Wr ''ku.- .. " , ,,< } ; .Q . | ||
. + e',E.,Y.m-.E. . , - - . m, .g , .n, ~7' , ,, .E. | . + e',E.,Y.m-.E. . , - - . m, .g , .n, ~7' , ,, .E. | ||
y 00 og T qs .,.; ~ , m.3 ',I j 4 Q | y 00 og T qs .,.; ~ , m.3 ',I j 4 Q | ||
.g * ; ad i Y '7 ] j * | |||
.g * ; ad i | |||
Y '7 ] j * | |||
,*"'I'. ., | ,*"'I'. ., | ||
.q .y q) yy h)".,a.. xv . , , r~'/ ; m , . v. 3 ,) r w,h.,saF.,.; c%;g ~ y.,.1f;w. .. s p i ? a, o | .q .y q) yy h)".,a.. xv . , , r~'/ ; m , . v. 3 ,) r w,h.,saF.,.; c%;g ~ y.,.1f;w. .. s p i ? a, o | ||
* 8"' : ; - (1). .C 4 i | * 8"' : ; - (1). .C 4 i | ||
; c..h.y: | ; c..h.y: | ||
+. J', j; - | +. J', j; - | ||
| Line 1,583: | Line 871: | ||
r | r | ||
: g. A.n M., z .- f' +.. ar .-.n..us 4- | : g. A.n M., z .- f' +.. ar .-.n..us 4- | ||
% ^5 I W-W j.'4:n ,ps, TD, | % ^5 I W-W j.'4:n ,ps, TD, | ||
-- . p- . | -- . p- . | ||
| Line 1,590: | Line 876: | ||
-m.% o w : 4 u g, ,c a j s .o,p . 'w w .,k.h; L"'.h[.6j a NMN.h j , agPO l | -m.% o w : 4 u g, ,c a j s .o,p . 'w w .,k.h; L"'.h[.6j a NMN.h j , agPO l | ||
fo' 8 , | fo' 8 , | ||
m u, S p.1 M w %.jw Y >. uya | m u, S p.1 M w %.jw Y >. uya s'[ m - " " '; ., ; gg.w.N.,..Y. ny! 3vQ .- - .}}.: ps | ||
., . .! ? ah. 3 a ,..f,+n a s Z | ., . .! ? ah. 3 a ,..f,+n a s Z | ||
c,,3 00 | c,,3 00 | ||
.e . . . W 4 j-yJ . ,. ~p,i3M? | .e . . . W 4 j-yJ . ,. ~p,i3M? | ||
Se s | Se s | ||
., :w <pf . .m. W.-e.. 5*. << .g # er i, i J. i Z g , | ., :w <pf . .m. W.-e.. 5*. << .g # er i, i J. i Z g , | ||
y " V r, | y " V r, | ||
-t.l'?la W l6.;sewY:ps, A , p &p#'.ef$W( p.c j .p4 e | -t.l'?la W l6.;sewY:ps, A , p &p#'.ef$W( p.c j .p4 e 3 | ||
3 | |||
l &, SQw +t % .t%* | l &, SQw +t % .t%* | ||
Q n g og | Q n g og rv ,.s d% '.u h MW4.n ' 7 h h h'';)q{;h 4M.,,. 's n(L'e t hig[A h %.. d o m i | ||
rv ,.s d% '.u h MW4.n ' 7 h h h'';)q{;h 4M.,,. 's n(L'e t hig[A h %.. d o m i | |||
< w n ,.s M ee | < w n ,.s M ee | ||
''*p.t3 y' x...'.8$'. n w ..-p m ,: s m*' %C y ' M 'moR.r ? x " .e | ''*p.t3 y' x...'.8$'. n w ..-p m ,: s m*' %C y ' M 'moR.r ? x " .e | ||
| Line 1,617: | Line 895: | ||
ps;;%:;3 wc M xGg s.. ,s..6. unm.,Qy%. oc i c.g ; w . .e G | ps;;%:;3 wc M xGg s.. ,s..6. unm.,Qy%. oc i c.g ; w . .e G | ||
,w e.,.Qy,.. g *., - !, | ,w e.,.Qy,.. g *., - !, | ||
.C %u | .C %u | ||
* o ,h f';W y. | * o ,h f';W y. | ||
| Line 1,624: | Line 901: | ||
\> | \> | ||
.s. | .s. | ||
_v. c M | _v. c M | ||
O g O 5 | O g O 5 | ||
''r ., .' N h. ; hq ;p/a/.[ k..3.. h* g,.. G uoy h: N. x p.1_.,, f.. | ''r ., .' N h. ; hq ;p/a/.[ k..3.. h* g,.. G uoy h: N. x p.1_.,, f.. | ||
r u.-. . ; t~ ~ , s, . sr . .. k(.)w ,,: Z,sn.1 -- | r u.-. . ; t~ ~ , s, . sr . .. k(.)w ,,: Z,sn.1 -- | ||
2 | 2 | ||
. ,,. ;w .:k.- | . ,,. ;w .:k.- | ||
.c ,; . | .c ,; . | ||
.g> .v - es , r.> m,m,p, | .g> .v - es , r.> m,m,p, | ||
,ga. g M | ,ga. g M | ||
.anez ' ., s ,. a 1 ;y V4 nr: *.,,,37 | .anez ' ., s ,. a 1 ;y V4 nr: *.,,,37 | ||
| Line 1,645: | Line 915: | ||
*Qq s p,A , y . .N,'.n , . , | *Qq s p,A , y . .N,'.n , . , | ||
b_z ,. : | b_z ,. : | ||
'u | 'u m t ' | ||
m t ' | |||
x; .r% g N .*- ^ .-rf qp4.pD,**": | x; .r% g N .*- ^ .-rf qp4.pD,**": | ||
* i ,,+ N; '. ' S '*'.4 | * i ,,+ N; '. ' S '*'.4 | ||
!3 . | !3 . | ||
%'[,. | %'[,. | ||
g f, y*{3 ;.e | g f, y*{3 ;.e | ||
.. . , if. | .. . , if. | ||
., c e q.e; @ g"r.y-Ny | ., c e q.e; @ g"r.y-Ny | ||
: 6. , J. 's | : 6. , J. 's | ||
,.*M~s([, | ,.*M~s([, | ||
**y g y , ',9- | **y g y , ',9- | ||
+.- | +.- | ||
| Line 1,669: | Line 931: | ||
sA* m' ' - , | sA* m' ' - , | ||
#,s;% A | #,s;% A | ||
. , em + ; ,' pP' % '* w*.w .% | . , em + ; ,' pP' % '* w*.w .% | ||
e fe, se '>M 4 | e fe, se '>M 4 | ||
t w s ,+. . , s j Q s a . . q.~ y'-4' ?1;,.e | t w s ,+. . , s j Q s a . . q.~ y'-4' ?1;,.e | ||
* I | * I | ||
; , * | ; , * | ||
.'%-s? t *+ ( ? _ }. Q p .y e | .'%-s? t *+ ( ? _ }. Q p .y e | ||
+],, | +],, | ||
, L. | , L. | ||
%w sr .e,p, . | %w sr .e,p, . | ||
| Line 1,684: | Line 943: | ||
.?% e .A | .?% e .A | ||
.. .g y . ,,%, .;9 } | .. .g y . ,,%, .;9 } | ||
g | g | ||
,, e .ng 13 Q,. .,m. .;-] ?;. g, u-; *' ' pp '4,.p.. y . -R. Wg.y y% ; . - | ,, e .ng 13 Q,. .,m. .;-] ?;. g, u-; *' ' pp '4,.p.. y . -R. Wg.y y% ; . - | ||
| Line 1,695: | Line 952: | ||
n g' | n g' | ||
,* Pt '' ,; a Q cc , . ' | ,* Pt '' ,; a Q cc , . ' | ||
T 3,,. | T 3,,. | ||
.p yy' Ag g''w m xd:g. | .p yy' Ag g''w m xd:g. | ||
| Line 1,702: | Line 958: | ||
,m, , | ,m, , | ||
.rt. s mm w; m. .wk.4,a. }y: :s.,w w . .*f; a | .rt. s mm w; m. .wk.4,a. }y: :s.,w w . .*f; a | ||
'e | 'e | ||
* m,j > , , | * m,j > , , | ||
2 m,,6ny p 's | 2 m,,6ny p 's | ||
' 7...in %3 su wm. hr y..f g . | ' 7...in %3 su wm. hr y..f g . | ||
.- '*giY F /* ''4 h 3 ^ | .- '*giY F /* ''4 h 3 ^ | ||
& '% : ' 4, , | & '% : ' 4, , | ||
r .v t kh b* MJ .h' h Q*{v.c .v3;~h.e. A ;w 4 ..a. r.u | r .v t kh b* MJ .h' h Q*{v.c .v3;~h.e. A ;w 4 ..a. r.u | ||
~ | ~ | ||
+ | + | ||
^m | ^m | ||
.M 3 | .M 3 | ||
.p. ,,::, | .p. ,,::, | ||
auf.;;.,6;,u gm.n;,gGyry; gw. a_M g.is m Nd | auf.;;.,6;,u gm.n;,gGyry; gw. a_M g.is m Nd | ||
1 l | 1 l | ||
BLN 1174-8 l 3 *; Q , | |||
BLN 1174-8 | |||
l 3 *; Q , | |||
, ,' - [ | , ,' - [ | ||
l f --Q _sx. ,y . | l f --Q _sx. ,y . | ||
f | f | ||
~. ,xj - | ~. ,xj - | ||
| Line 1,737: | Line 981: | ||
~ | ~ | ||
\, * | \, * | ||
\. . i 1 | \. . i 1 | ||
t | t | ||
\ , | \ , | ||
I . | I . | ||
/ | / | ||
;. , s | ;. , s | ||
.} | .} | ||
i | i | ||
,.- ) | ,.- ) | ||
. ; . : | . ; . : | ||
^~\ ? . | ^~\ ? . | ||
i | i | ||
(/ 7 ~~ , - s m.~ ~ - . | (/ 7 ~~ , - s m.~ ~ - . | ||
e . . ' | e . . ' | ||
'.* , J.g ,~,s. ' | '.* , J.g ,~,s. ' | ||
' 'I _ :'R,7 - | ' 'I _ :'R,7 - | ||
i ,,,'. * | i ,,,'. * | ||
' - ~ , | ' - ~ , | ||
_ , - 3, g- | _ , - 3, g- | ||
*r rf' i, ,\ - | |||
*r | |||
rf' i, ,\ - | |||
S | S | ||
- ,. ~ r | - ,. ~ r | ||
:~ | :~ | ||
,/ , | ,/ , | ||
.. I v | .. I v | ||
.. s. . | .. s. . | ||
f | f | ||
., s, | ., s, | ||
/? \ / l N('/ 7- - | /? \ / l N('/ 7- - | ||
NA) . | NA) . | ||
- i Middle l | - i Middle l j N-# , / , , g i | ||
j N-# , / , , g i | |||
-k y' I | -k y' I | ||
. l 4 P | . l 4 P | ||
,,- q N/ | ,,- q N/ | ||
s J | s J | ||
I | I | ||
.w . .i J s - \_ i - | .w . .i J s - \_ i - | ||
/ | / | ||
1 l | 1 l s | ||
y., 41 l | |||
* i | * i | ||
> N _. , | > N _. , | ||
-s . | -s . | ||
s | s | ||
. \ | . \ | ||
Inside Electrolytic etch in 10% oxalic acid 100X d | |||
Inside | |||
Electrolytic etch in 10% oxalic acid 100X d | |||
Specimen No. 21 (Sample No. 1) | Specimen No. 21 (Sample No. 1) | ||
Fig. 1-9 The carbide precipitation in the base metal away from both the circumfe7ential and the longitudinal welds. Note the surface ., | Fig. 1-9 The carbide precipitation in the base metal away from both the circumfe7ential and the longitudinal welds. Note the surface ., | ||
intergranular penetration probably from pickling. | intergranular penetration probably from pickling. | ||
', BLN 1174-8 t | |||
', BLN 1174-8 | cfz ., ' x -,. A i,/ .3,..t i | ||
e' \ ; '. * | e' \ ; '. * | ||
/ | / | ||
go . j/, .,.. '. | go . j/, .,.. '. | ||
x .j i . | |||
x .j | |||
i | |||
-. ~ | -. ~ | ||
. . i , | . . i , | ||
s s .- .; | s s .- .; | ||
s, . - | s, . - | ||
| Line 1,875: | Line 1,044: | ||
o . | o . | ||
; . | ; . | ||
. \Q' * , | . \Q' * , | ||
/ . | / . | ||
/ '- - | / '- - | ||
; | ; | ||
. ./ . | . ./ . | ||
so ' ' | so ' ' | ||
1 | 1 | ||
\ .' | \ .' | ||
,, i | ,, i tl.hl , . _... . | ||
tl.hl , . _... . | |||
(a) Outside 100X (b) Outside 500X | (a) Outside 100X (b) Outside 500X | ||
/ ** | / ** | ||
l ^. ...* . . | l ^. ...* . . | ||
11 - | 11 - | ||
; ' | ; ' | ||
~ | ~ | ||
. ..-';. '] | . ..-';. '] | ||
( | ( | ||
j | j | ||
, . . i | , . . i | ||
- ' + - | - ' + - | ||
( . | ( . | ||
sn , | sn , | ||
_\-' - - | _\-' - - | ||
/ . | / . | ||
l | l | ||
( -~' , | ( -~' , | ||
I | I | ||
~, . | ~, . | ||
} 1 , | } 1 , | ||
s , / L - - | s , / L - - | ||
s | s t, , | ||
i (c) Middle 100X (d) Middle 500X Specimen No. 11 (Sample No. 1) , | |||
t, | |||
i | |||
(c) Middle 100X (d) Middle 500X Specimen No. 11 (Sample No. 1) , | |||
Eig. 1-10 The microstructure of the longitudinal weld showing recrystallized grains, carbide precipitation and intergranular surface attack by pickling. | Eig. 1-10 The microstructure of the longitudinal weld showing recrystallized grains, carbide precipitation and intergranular surface attack by pickling. | ||
Electrolytic etching in 10% oxalic acid. | Electrolytic etching in 10% oxalic acid. | ||
These pictures indicate the pipe was solution treated after seam welding. | These pictures indicate the pipe was solution treated after seam welding. | ||
- - - - - - , - , , , - , - - - . - , , ~ , - | - - - - - - , - , , , - , - - - . - , , ~ , - | ||
, _ , + , - ,--,,--,,m,. , - , , - , . , . , . , , , . , - . , , . , , , , pws,,,--,,,,,,se---- w- | , _ , + , - ,--,,--,,m,. , - , , - , . , . , . , , , . , - . , , . , , , , pws,,,--,,,,,,se---- w- | ||
BUI 1174-8 l | BUI 1174-8 l | ||
l l | l l | ||
| Line 1,985: | Line 1,087: | ||
l l | l l | ||
e l | e l | ||
(a) 1000X l | (a) 1000X l | ||
i 4 | |||
i | (b) 1000X , | ||
Specimen No. 10 (Sample No. 1) | Specimen No. 10 (Sample No. 1) | ||
Fig. 1-11 Micrographs showing oxidation (or corrosion) products at the bottom ' | Fig. 1-11 Micrographs showing oxidation (or corrosion) products at the bottom ' | ||
of ditches on the inside surface. As polished. , | of ditches on the inside surface. As polished. , | ||
*= | *= | ||
w-r -- + -s*'a s% - - | w-r -- + -s*'a s% - - | ||
| Line 2,001: | Line 1,098: | ||
-,------e --e-%w+m-w, --we -- yw--=+ w | -,------e --e-%w+m-w, --we -- yw--=+ w | ||
' ~ '- BLN 1174-8 l | |||
' ~ '- BLN 1174-8 | |||
l l | l l | ||
l | |||
% . .:,2. | % . .:,2. | ||
l e +2#* ** J s. . ;,,, .y ., | l e +2#* ** J s. . ;,,, .y ., | ||
#' ~ ~ Ym,. | #' ~ ~ Ym,. | ||
g,,. [h * | g,,. [h * | ||
| Line 2,017: | Line 1,108: | ||
.. ,-- . .e ;,.. . * *. | .. ,-- . .e ;,.. . * *. | ||
.~g ; .. , . | .~g ; .. , . | ||
~ * . | ~ * . | ||
.~ - d - w3 Q _;. } , | .~ - d - w3 Q _;. } , | ||
,m | ,m | ||
, .i . ',7 :1 R7. * '. | , .i . ',7 :1 R7. * '. | ||
,% ..p . ,.* : ..- =~= . $ . ?. . . . | ,% ..p . ,.* : ..- =~= . $ . ?. . . . | ||
- - / .', e !. ' AiW 1 | - - / .', e !. ' AiW 1 | ||
-4,.,',. w.'*% - > .~ g3 f'; | -4,.,',. w.'*% - > .~ g3 f'; | ||
[ ~~~;.d '' | [ ~~~;.d '' | ||
.c- ,. D | .c- ,. D | ||
* gy, 3 - | * gy, 3 - | ||
i | i | ||
.s - | .s - | ||
l 'G'G r, a} ' | |||
l 'G'G r, | |||
a} ' | |||
=~g | =~g | ||
* A. - | * A. - | ||
l | l y | ||
y | |||
._ .. .~. . | ._ .. .~. . | ||
(a) 85X l | (a) 85X l | ||
, ( ' 9:~ f c f * * | , ( ' 9:~ f c f * * | ||
' ~ .s . .;.,,1,' . -j | ' ~ .s . .;.,,1,' . -j bZ ~, | ||
bZ ~, | |||
7 r.* ',. l . | 7 r.* ',. l . | ||
d "-, s.. .?A / *, *r R. _.- 'W_ 4.Y ,','q ) f '* | d "-, s.. .?A / *, *r R. _.- 'W_ 4.Y ,','q ) f '* | ||
' ''~ | ' ''~ | ||
s | s | ||
.; -,..,-.2-- *% _ | .; -,..,-.2-- *% _ | ||
. t, | . t, | ||
, 7. , - .+ s... | , 7. , - .+ s... | ||
% s- | % s- | ||
- ,,. y- . | - ,,. y- . | ||
-. ,x i, . | -. ,x i, . | ||
'l g A - | |||
'l | |||
g A - | |||
y:lEskN,pj -?2;.N. ~~ ~ ,'k^y' . | y:lEskN,pj -?2;.N. ~~ ~ ,'k^y' . | ||
~ | ~ | ||
: u. .' .:s3n:-f | : u. .' .:s3n:-f | ||
.m _ | .m _ | ||
(b) 420X Specimen No. 17 (Sample No. 1) | (b) 420X Specimen No. 17 (Sample No. 1) | ||
Fig. 1-12 Scanning electron micrographs of the crack as viewed from the inside surface. (b) shows the area marked by the arrow in (a). | Fig. 1-12 Scanning electron micrographs of the crack as viewed from the inside surface. (b) shows the area marked by the arrow in (a). | ||
d d | d d | ||
BLN 1174-8 t .. | |||
BLN 1174-8 | |||
t .. | |||
l w | l w | ||
.w . | .w . | ||
, , ,,jc s . - - | , , ,,jc s . - - | ||
| Line 2,125: | Line 1,155: | ||
:.r, th | :.r, th | ||
(% . | (% . | ||
-s b | -s b | ||
,yg ." | ,yg ." | ||
N -As- , | N -As- , | ||
[' - | [' - | ||
y | y | ||
.; | .; | ||
-CL. | -CL. | ||
| Line 2,143: | Line 1,165: | ||
? . | ? . | ||
b ~ | b ~ | ||
;n , y', ; * | ;n , y', ; * | ||
-4 g Yl | -4 g Yl | ||
,e i | |||
,e | |||
i | |||
i m m .cg _ . . u_.m . . . . . _ _ , . | i m m .cg _ . . u_.m . . . . . _ _ , . | ||
! (b) Outside edge 530X Specimen No. 17 (Sample No. 1) | ! (b) Outside edge 530X Specimen No. 17 (Sample No. 1) | ||
Fig. 1-13 Scanning electron micrographs of the fracture facets in the mid- | Fig. 1-13 Scanning electron micrographs of the fracture facets in the mid- | ||
>; | >; | ||
thickness and near the outside surface. | thickness and near the outside surface. | ||
p,,v-e ,- ,-,,m,,,, _ _ , _ . - ,w- , , , , , , , y , , , _ , . , , . _ , . .._m..,,,,w-,-, ,,,,,--,--._e,,_,.,.. - - - - - , , - , , - , , . , _ _ -,_,_,-,,,~,r,,m--_,---,-.,w-m_,,,,w,-- | p,,v-e ,- ,-,,m,,,, _ _ , _ . - ,w- , , , , , , , y , , , _ , . , , . _ , . .._m..,,,,w-,-, ,,,,,--,--._e,,_,.,.. - - - - - , , - , , - , , . , _ _ -,_,_,-,,,~,r,,m--_,---,-.,w-m_,,,,w,-- | ||
BLN 1174-8 | BLN 1174-8 | ||
~.,- . .-- | ~.,- . .-- | ||
,-. p' | ,-. p' g ,l ~ * ,, , ' p 3 - | ||
Uf{;h ? l' p ., | Uf{;h ? l' p ., | ||
~r(?a~Vf'ml,'~ | ~r(?a~Vf'ml,'~ | ||
l .''- .,. | l .''- .,. | ||
. _- x1 ; | . _- x1 ; | ||
. . .. ay,:.w v. *(m:r. v x- | . . .. ay,:.w v. *(m:r. v x- | ||
. . . .. .3 ., | . . . .. .3 ., | ||
?( | ?( | ||
' ~ | ' ~ | ||
~ Y r3~ | ~ Y r3~ | ||
.f*''' | .f*''' | ||
N,;g+)' *?f.f7 W.N, n~2 , "~ | N,;g+)' *?f.f7 W.N, n~2 , "~ | ||
j'. r r. y ~ ?q | j'. r r. y ~ ?q | ||
~ | ~ | ||
: f. . 4,_ - | : f. . 4,_ - | ||
. -; | . -; | ||
e - r. , - . | e - r. , - . | ||
, *# g ., ' ag (a) Outside surface 420X w".~p 3 . f ;_ w- . | , *# g ., ' ag (a) Outside surface 420X w".~p 3 . f ;_ w- . | ||
..tMi4 s | ..tMi4 s | ||
| Line 2,206: | Line 1,201: | ||
-~. v | -~. v | ||
' g ., .- ~~s | ' g ., .- ~~s | ||
_+ ./4 . i l | |||
_+ ./4 . i | |||
l | |||
} | } | ||
3 .. | 3 .. | ||
-) | -) | ||
(b) Inside surface 350X - ! | (b) Inside surface 350X - ! | ||
l Specimen No. 13 (Sample No. 1) | l Specimen No. 13 (Sample No. 1) | ||
Fig. 1-14 Scanning electron micrographs showing intergranular ditches on | Fig. 1-14 Scanning electron micrographs showing intergranular ditches on both inside and outside surfaces. This is " dried mud cracked" surface apparent at 6X. | ||
both inside and outside surfaces. This is " dried mud cracked" surface apparent at 6X. | |||
l | l | ||
\ | \ | ||
--y,.. ,_ | --y,.. ,_ | ||
-w. . , , _ . . , - - - __ . _ , , - . . -_____m , | -w. . , , _ . . , - - - __ . _ , , - . . -_____m , | ||
. - - - + - - - - v- | . - - - + - - - - v- | ||
BLN 1174-8 i | BLN 1174-8 i | ||
l l | l l | ||
| Line 2,238: | Line 1,219: | ||
l - | l - | ||
7,p - | 7,p - | ||
r f Ef ,,, * | r f Ef ,,, * | ||
.c | .c | ||
/ cx 4 | / cx 4 | ||
.; f, '} . 1C. | .; f, '} . 1C. | ||
h'f.v g* .+ | |||
h'f.v | |||
g* .+ | |||
> W. , *' | > W. , *' | ||
?'' p =.$ < | ?'' p =.$ < | ||
. . f.N.s s.Q | . . f.N.s s.Q | ||
' 's | ' 's | ||
%s g a | %s g a | ||
'.?,,.~ | '.?,,.~ | ||
,/.. uj | ,/.. uj 21' y | ||
21' y | |||
! ;' * ; | ! ;' * ; | ||
rr a. | rr a. | ||
., . r. | ., . r. | ||
".,$ g 3 -- h- | ".,$ g 3 -- h- | ||
% _ ;W,g* - - | % _ ;W,g* - - | ||
'" M-= .- | '" M-= .- | ||
2 A $7 . y ,Vyg g _.; - | 2 A $7 . y ,Vyg g _.; - | ||
, % v . g ., , @ , ./. 7,34 c 4 . | , % v . g ., , @ , ./. 7,34 c 4 . | ||
. j ,. ..x - | . j ,. ..x - | ||
.... -) - | .... -) - | ||
. .- ~ ~k ,.:r.g,n . | . .- ~ ~k ,.:r.g,n . | ||
%'- f # .;; e ..L . | %'- f # .;; e ..L . | ||
; th | ; th | ||
*_. ;'); ; .. | *_. ;'); ; .. | ||
. - ,' c,. .. .* - | . - ,' c,. .. .* - | ||
.. r | .. r | ||
| Line 2,297: | Line 1,252: | ||
< ' ; . P.,' i ' , .'- | < ' ; . P.,' i ' , .'- | ||
, ,j% 'Y ,: _'* , | , ,j% 'Y ,: _'* , | ||
[ | [ | ||
''.~. | ''.~. | ||
i | i | ||
+ | + | ||
y *1 | y *1 | ||
~ g .4 | ~ g .4 | ||
.7%~ | .7%~ | ||
'* -~i '- | '* -~i '- | ||
* . . . . . . . . . .._*e.9 . | * . . . . . . . . . .._*e.9 . | ||
(a) Viewed from inside 500X | (a) Viewed from inside 500X | ||
; | ; | ||
-mv. | -mv. | ||
1 . | 1 . | ||
14 '. . | 14 '. . | ||
yg n.1 W | yg n.1 W | ||
# j. c 6 | # j. c 6 | ||
- y b ,g, N ._ * | - y b ,g, N ._ * | ||
; # s [f ' . M-[.1_ ., | ; # s [f ' . M-[.1_ ., | ||
; | ; | ||
-~,,.. | -~,,.. | ||
.... .a | .... .a | ||
~ + fy. g,c_-. s | ~ + fy. g,c_-. s | ||
_ _, . 3 - . o . .- | _ _, . 3 - . o . .- | ||
(b) Viewed toward inside 1050X Specimen No. 17 (Sample No. 1) l Fig. 1-15 Scanning electron micrographs showing deposit on the fracture facets along the inside surface. | |||
(b) Viewed toward inside 1050X | |||
Specimen No. 17 (Sample No. 1) l Fig. 1-15 Scanning electron micrographs showing deposit on the fracture facets along the inside surface | |||
-, , _ , , _ . - . , . .,,. , .,y- - - - - _ - | -, , _ , , _ . - . , . .,,. , .,y- - - - - _ - | ||
.y_.-,_ - _-w_, -,_,-,w-,-,,.-y--,-.-e, --- | .y_.-,_ - _-w_, -,_,-,w-,-,,.-y--,-.-e, --- | ||
1 | 1 | ||
. . 1 r j 1 | |||
. . 1 r j | 1 APPENDIX 2 PICTORIAL REVIEW OF CRACK No. 2 . | ||
1 | |||
APPENDIX 2 PICTORIAL REVIEW OF CRACK No. 2 . | |||
.; | .; | ||
1 | 1 e | ||
l 3 | |||
3 | |||
'; | '; | ||
l | l 4 | ||
,,--w,-,,-,-----,an,-, -,nn,,,,-,.. | |||
4 | |||
,,--w,-,,-,-----,an,-, -,nn,,,,-,.. | |||
BLN 1174-8 W r x -% | BLN 1174-8 W r x -% | ||
N | N | ||
| Line 2,396: | Line 1,295: | ||
! \ @ / | ! \ @ / | ||
t ~c | t ~c | ||
, t , | , t , | ||
I r i | I r i f.I i 0 | ||
f.I i 0 | |||
'1 | '1 | ||
' circu are=Ila! | ' circu are=Ila! | ||
j 'f wfIE di QW .. -,3 ' | |||
j 'f wfIE | |||
di QW .. -,3 ' | |||
h | h | ||
: "T | : "T | ||
. $ I - | . $ I - | ||
)v < 1 | )v < 1 3 | ||
s | |||
~. | ~. | ||
g-.. _ | g-.. _ | ||
3 | 3 | ||
/ $ | / $ | ||
( w- % | ( w- % | ||
s | s | ||
- - .3 r , ; | - - .3 r , ; | ||
b $E ' | b $E ' | ||
| Line 2,430: | Line 1,316: | ||
i *Q,;.< ** iw , | i *Q,;.< ** iw , | ||
''Q;f{hf? | ''Q;f{hf? | ||
3 , | 3 , | ||
=- x , | =- x , | ||
g- - =~. | g- - =~. | ||
s sw:<* | s sw:<* | ||
c . m*[,. | c . m*[,. | ||
_ 1l , , r | |||
.M s s | |||
.M s | |||
s | |||
< . 1 | < . 1 | ||
: u. .s g | : u. .s g | ||
/-, ss - ._ | /-, ss - ._ | ||
. ., s , | . ., s , | ||
p;q | p;q | ||
^ Tl$l*??'.K;e.: v y ' | ^ Tl$l*??'.K;e.: v y ' | ||
fj,;-n)', ?\ . | fj,;-n)', ?\ . | ||
>s | >s | ||
.gj . . | .gj . . | ||
+,...y- , | +,...y- , | ||
. .; ; . _ . | . .; ; . _ . | ||
, .n e ' | , .n e ' | ||
ry ?:iG 5b i ', | ry ?:iG 5b i ', | ||
$$9fplj L. | $$9fplj L. | ||
(J.i.W-'p- ... e | (J.i.W-'p- ... e | ||
;,(_ bb & Y , | ;,(_ bb & Y , | ||
Sample No. 2 | Sample No. 2 | ||
. Fig. 2-1 Sketch showing the locations of the samples received and the lccationr for the metallographic specimens. | . Fig. 2-1 Sketch showing the locations of the samples received and the lccationr for the metallographic specimens. | ||
l l | l l | ||
.I | .I I ' | ||
I ' | |||
BLN 1174-8 i | BLN 1174-8 i | ||
i | i | ||
( 9 tJ na 31G :. - | ( 9 tJ na 31G :. - | ||
I - | I - | ||
lll l l slilsle ils .ti 8,!.';lililil* . . . . . . | lll l l slilsle ils .ti 8,!.';lililil* . . . . . . | ||
. . +t*' ; , | . . +t*' ; , | ||
,y. . .:...,.~-_._.<~p g__ ,,- | ,y. . .:...,.~-_._.<~p g__ ,,- | ||
y, | y, | ||
; c'..... .. | ; c'..... .. | ||
.. Q' .s' s.-- : . a; - .;, 7c | .. Q' .s' s.-- : . a; - .;, 7c | ||
-.-~ | -.-~ | ||
. ' | . ' | ||
* m.' ,. . | * m.' ,. . | ||
~ | ~ | ||
lM} . %, - | lM} . %, - | ||
. ,.. ;< < , , _ | . ,.. ;< < , , _ | ||
* s: ; | * s: ; | ||
. L9 y :; -- | |||
. L9 | |||
y :; -- | |||
, ;;E* . | , ;;E* . | ||
7 | 7 | ||
, : ;I ... .- | , : ;I ... .- | ||
i ~ ;. ~ . i;.:, - w. N.\ ir_ | i ~ ;. ~ . i;.:, - w. N.\ ir_ | ||
1 7 'q,q t - | 1 7 'q,q t - | ||
' i =. _. | ' i =. _. | ||
n; l < | |||
n; | |||
l < | |||
=. | =. | ||
E~ | E~ | ||
f - | f - | ||
E f 5 t | E f 5 t | ||
s'n r: | s'n r: | ||
(a) f( | (a) f( | ||
l (b) | l (b) | ||
' ~ | ' ~ | ||
~ | ~ | ||
m*a4,? | m*a4,? | ||
" gig,y-.? , | " gig,y-.? , | ||
g Q,;;'c ".it qi | g Q,;;'c ".it qi | ||
.Y.cy.n | .Y.cy.n | ||
~ | ~ | ||
i 2 , k g,* . . | i 2 , k g,* . . | ||
.- S-%, . s '*2 1. j ' ! | .- S-%, . s '*2 1. j ' ! | ||
| Line 2,564: | Line 1,388: | ||
,y . ;, - - | ,y . ;, - - | ||
., . ,M-f , 't c,-;.: . . V,- . .-J. c | ., . ,M-f , 't c,-;.: . . V,- . .-J. c | ||
; - | ; - | ||
':' =.5 s. .., ;' a;:.t 3. . .n - , | ':' =.5 s. .., ;' a;:.t 3. . .n - , | ||
,i | ,i L, . ,. c: -- | ||
L, . ,. c: -- | |||
:: N ,@. 'N% | :: N ,@. 'N% | ||
' , ru M. - | ' , ru M. - | ||
'M.. lc +% t.F.'.,.A. | 'M.. lc +% t.F.'.,.A. | ||
f" .,;*, Q- . , . .. ' ; . | f" .,;*, Q- . , . .. ' ; . | ||
J. - . ,.' . . . ; P. | J. - . ,.' . . . ; P. | ||
t | t | ||
$. m . ../ '' ..' . ;',.,. S. | $. m . ../ '' ..' . ;',.,. S. | ||
. .f; t J. | . .f; t J. | ||
.s ' | .s ' | ||
| Line 2,590: | Line 1,403: | ||
. .. J , | . .. J , | ||
-w%%.. ;., > ', .-;. y * ,: ~ y)3, | -w%%.. ;., > ', .-;. y * ,: ~ y)3, | ||
.v. - u.;bl*^,.]- | .v. - u.;bl*^,.]- | ||
'g, ._ | 'g, ._ | ||
: w. ; , .. ,. .g.s ' | : w. ; , .. ,. .g.s ' | ||
a.- , | a.- , | ||
l | l | ||
~ | ~ | ||
J l (c) 4.X l Sample No. 2, Fig. 2-2 The crack in ssmple No. 2. The arrows in (a) and (c) show the same area. (b) is a side view of (a). | |||
l l | |||
J l (c) 4.X | |||
l Sample No. 2, Fig. 2-2 The crack in ssmple No. 2. The arrows in (a) and (c) show the same area. (b) is a side view of (a). | |||
l l | l l | ||
l I | l I | ||
BLN 1174-8 f | BLN 1174-8 f | ||
l l | l l | ||
1 l | 1 l | ||
i | i | ||
'N'; :,yt vw w~ | 'N'; :,yt vw w~ | ||
i | i | ||
. v , , .f , .- - , f< .g ~ A.. , f , | . v , , .f , .- - , f< .g ~ A.. , f , | ||
9 4jh" {Q. r, / l | 9 4jh" {Q. r, / l l | ||
s.- , | |||
:. ; . - | :. ; . - | ||
.~ s , , | .~ s , , | ||
g, _ | g, _ | ||
, , -;* | , , -;* | ||
u. | u. | ||
,1 vvg.s }, .. | ,1 vvg.s }, .. | ||
^ | ^ | ||
g g | g g | ||
,1 . . | ,1 . . | ||
~~ | ~~ | ||
_. , l | _. , l | ||
. ~ -- ,, . | . ~ -- ,, . | ||
' i --h- .1_ C_I m___ , | ' i --h- .1_ C_I m___ , | ||
l Electrolytic etch in 10% oxalic acid 15X | l Electrolytic etch in 10% oxalic acid 15X Specimen No. 211 (Samplo No. 2) | ||
Specimen No. 211 (Samplo No. 2) | |||
Fig. 2-3 Macrograph of a section through the crack shown in Fig. 2-2. | Fig. 2-3 Macrograph of a section through the crack shown in Fig. 2-2. | ||
e 4 | e 4 | ||
e | e | ||
-+-w-----,-- w ----w, , - , - , . - ,,--,--,..,w-v--,- wg- -,,,-y-,- ,---- - , - , , ,- -,,,----+,--_-w..-,,,+%m,,,wwnw ., | -+-w-----,-- w ----w, , - , - , . - ,,--,--,..,w-v--,- wg- -,,,-y-,- ,---- - , - , , ,- -,,,----+,--_-w..-,,,+%m,,,wwnw ., | ||
BLN 1174-8 s | |||
BLN 1174-8 | |||
s | |||
) ., | ) ., | ||
~ | ~ | ||
7 s 5- .l. | |||
7 s | |||
5- .l | |||
, .k | , .k | ||
. T | . T hk - - | ||
hk - - | |||
s I (a) As polished 100X 1 | s I (a) As polished 100X 1 | ||
,A . | ,A . | ||
: h. . | : h. . | ||
, N, * | , N, * | ||
\ | \ | ||
} ,_ ~ | } ,_ ~ | ||
N ~ | N ~ | ||
~" | ~" | ||
L . | L . | ||
s | s | ||
# k '/ , | # k '/ , | ||
gL , .. .,- | |||
(b) Light electrolytic etch in 10% NaCN 100X Specimen No. 211 (Sample No. 2) | (b) Light electrolytic etch in 10% NaCN 100X Specimen No. 211 (Sample No. 2) | ||
Fig. 2-4 Micrographs showing intergranular cracks marked by the arrow in Fig. 2-3. | Fig. 2-4 Micrographs showing intergranular cracks marked by the arrow in Fig. 2-3. | ||
l l | l l | ||
l l | l l | ||
,, , , , -'s | ,, , , , -'s | ||
- BLN 1174-8 l | |||
- BLN 1174-8 | r | ||
''y &M,x | ''y &M,x | ||
: f. '.NL '- f | : f. '.NL '- f | ||
- 8 - | - 8 - | ||
7 i - t . ._ | 7 i - t . ._ | ||
. ~. V | . ~. V | ||
. L. | . L. | ||
j | j | ||
- s . | - s . | ||
.r,.-- -, . | .r,.-- -, . | ||
q., _ f. | q., _ f. | ||
'f''w. ' ,, . | 'f''w. ' ,, . | ||
l s | l s | ||
.\-- 3, ( :. | .\-- 3, ( :. | ||
(, | (, | ||
~ | ~ | ||
er .. s ..... | er .. s ..... | ||
; | ; | ||
t | t | ||
~ | ~ | ||
.)~ . | .)~ . | ||
.l 1 s | .l 1 s | ||
,a . . | ,a . . | ||
; , | ; , | ||
j | j | ||
. Middle I | . Middle I | ||
~p\'s ? | ~p\'s ? | ||
.n w ~...' | .n w ~...' | ||
/ l r i * \ | / l r i * \ | ||
i - | i - | ||
, t. | , t. | ||
s ,. | s ,. | ||
{ -". , | { -". , | ||
I | I | ||
\. ' \ 35 | \. ' \ 35 | ||
>i 0 . , | >i 0 . , | ||
I' | I' i | ||
I 1 | |||
i | 4 . . i Inside l surface i | ||
100X Specimen No. 218 (Sample No. 2) i I | |||
I | |||
1 | |||
4 . . i | |||
Inside l surface i | |||
100X | |||
Specimen No. 218 (Sample No. 2) i I | |||
l. | l. | ||
Fig. 2-5 Micrographs showing carbide precipitates in the base metal. ; | Fig. 2-5 Micrographs showing carbide precipitates in the base metal. ; | ||
Electrolytic etch in 10% oxalic acid. | Electrolytic etch in 10% oxalic acid. | ||
1 | 1 | ||
l l | l l | ||
l l | l l | ||
l 1 | |||
1 | |||
/* | /* | ||
.+ i l | .+ i l | ||
1 | 1 | ||
) | ) | ||
| Line 2,848: | Line 1,523: | ||
PICTORIAL REVIEW OF CRACK No. 3 - | PICTORIAL REVIEW OF CRACK No. 3 - | ||
O T | O T | ||
"d | "d O | ||
Y h | |||
h | |||
D | D | ||
,---,---,e,. ,,, ,, -,c--, --- - - - , _w.,,,,-,,,e _ | ,---,---,e,. ,,, ,, -,c--, --- - - - , _w.,,,,-,,,e _ | ||
em-ygeo m ,we+yy | em-ygeo m ,we+yy | ||
BLN 1174-8 | BLN 1174-8 | ||
~ | ~ | ||
m U | m U | ||
.u. : | .u. : | ||
n .- h c'He'll g | n .- h c'He'll g | ||
; | ; | ||
** y ot hek 3*9 | ** y ot hek 3*9 | ||
''- erad% ,,p A a | ''- erad% ,,p A a | ||
7 o' clock ' ,,; | 7 o' clock ' ,,; | ||
| Line 2,885: | Line 1,548: | ||
!\h\ se f cs | !\h\ se f cs | ||
\\ | \\ | ||
.a ! | .a ! | ||
,p' j | ,p' j | ||
%~' **"*~ l | %~' **"*~ l | ||
-- p g? | -- p g? | ||
5-! | 5-! | ||
/ | / | ||
Jof | Jof 1 | ||
l's one oibek ; i CS M s / 4 4 | |||
CS M s / 4 4 | |||
t.- | t.- | ||
/,/ - | /,/ - | ||
Sample No. 3 I Fifi. 3-1 Sketch showing the locations of cracks and metallographic specimens. | |||
Sample No. 3 | |||
I Fifi. 3-1 Sketch showing the locations of cracks and metallographic specimens. | |||
b O | b O | ||
l l | l l | ||
i i - | i i - | ||
BLN 1174-8' ' | BLN 1174-8' ' | ||
t | t | ||
. l | . l I | ||
i i | |||
mu vyy.,.r.w . | |||
c-~~.~ : - . | c-~~.~ : - . | ||
r -v.s e I | r -v.s e I | ||
'J '^ K;g.) " 2 ~L : ?s- '%: ..- G w l A., , _ - M , e .- ' | 'J '^ K;g.) " 2 ~L : ?s- '%: ..- G w l A., , _ - M , e .- ' | ||
; :. .. | ; :. .. | ||
, e- ~' - . . . ., . | , e- ~' - . . . ., . | ||
; | ; | ||
; ,.%. - | ; ,.%. - | ||
i (m. yer . . | i (m. yer . . | ||
, ., . er,w | , ., . er,w | ||
;- | ;- | ||
f :. '. %- y; hy | f :. '. %- y; hy | ||
,t .. J.y ~.;.: .Di 4 | |||
,t .. J.y ~.;.: .Di | e.-mm .- | ||
.i # .a .t . | .i # .a .t . | ||
:a . . > | :a . . > | ||
7 .. | 7 .. | ||
~ | ~ | ||
gT~} zwt gwo= -- g ~ ~ _ - . . > -{y}}s. | gT~} zwt gwo= -- g ~ ~ _ - . . > -{y}}s. | ||
-t & | -t & | ||
^W5 . . '$Y 'l D'yi-%;f - | ^W5 . . '$Y 'l D'yi-%;f - | ||
i g-:.w Eg.7 - | i g-:.w Eg.7 - | ||
sy | sy d.14 | ||
d.14 | |||
, y, | , y, | ||
\ >.. n . t.. :=. so . | \ >.. n . t.. :=. so . | ||
.(a) | .(a) l - | ||
l - | |||
.t. | .t. | ||
! ,'; . . ..~ C ;. | ! ,'; . . ..~ C ;. | ||
h h~ $h l' * | h h~ $h l' * | ||
. H, | . H, | ||
/E3 , . 4, - | /E3 , . 4, - | ||
'~ t_ w. | '~ t_ w. | ||
ud | ud | ||
.._. i La Y$ | |||
.._. i | |||
La Y$ | |||
t | t | ||
:. f | :. f | ||
(- | (- | ||
| Line 3,007: | Line 1,609: | ||
; t#- . | ; t#- . | ||
-. t id: . . . i 4,3 | -. t id: . . . i 4,3 | ||
. 'h a | . 'h a | ||
'g. | 'g. | ||
%:.fe<- . | %:.fe<- . | ||
(b) , | (b) , | ||
Sample No. 3 Fig. 3-2 The failed end of sample No. 3. (a) shows the same orientation as Fig. 3-1. (b) is a view from the opposite side. The arrows mark the through crack at the one o' clock position. Both the 12 o' clock | Sample No. 3 Fig. 3-2 The failed end of sample No. 3. (a) shows the same orientation as Fig. 3-1. (b) is a view from the opposite side. The arrows mark the through crack at the one o' clock position. Both the 12 o' clock and the 7 o' clock positions were flattened. | ||
and the 7 o' clock positions were flattened. | |||
t e | t e | ||
l | l | ||
_ _ _ ~ . . - - __ _ _ __ _ _. _ __ - - | _ _ _ ~ . . - - __ _ _ __ _ _. _ __ - - | ||
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e.MQI .. | |||
a Q | a Q | ||
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~. $ h | |||
l | |||
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\ | \ | ||
s *R. " ''- | s *R. " ''- | ||
.Q | .Q | ||
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s o | |||
o | |||
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| Line 3,072: | Line 1,648: | ||
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| Line 3,141: | Line 1,688: | ||
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x ' | |||
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| Line 3,192: | Line 1,718: | ||
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| Line 3,247: | Line 1,749: | ||
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| Line 3,271: | Line 1,767: | ||
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| Line 3,282: | Line 1,775: | ||
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I N | I N | ||
*.a*.,. y % | *.a*.,. y % | ||
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s g (, | s g (, | ||
7 o' clock 4X Specimen No. 303 (Sample No. 3) | 7 o' clock 4X Specimen No. 303 (Sample No. 3) | ||
Fig. 3-4 The tight crack at the 7 o' clock position as viewed on the inside surface. This crack did not propagate through the wall. | Fig. 3-4 The tight crack at the 7 o' clock position as viewed on the inside surface. This crack did not propagate through the wall. | ||
tn 4 - | tn 4 - | ||
H N. | H N. | ||
D t | D t | ||
00 | 00 | ||
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4 i | 4 i | ||
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3 l | 3 l | ||
l (a) Specimen No. 305 15X l l | l (a) Specimen No. 305 15X l l | ||
l l | l l | ||
J s | |||
J | |||
s | |||
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(b) Specimen No. 309 15X l | |||
l I | |||
Sample No. 3 Fig. 3-5 (a) Macrograph showing a section through the crack in Fig. 3-3. | |||
(b) Specimen No. 309 15X | |||
l | |||
(b) Macrograph showing a section through the crack in Fig. 3-4. | (b) Macrograph showing a section through the crack in Fig. 3-4. | ||
Both electrolytically etched in 10% oxalic acid. | Both electrolytically etched in 10% oxalic acid. | ||
^ | ^ | ||
BLN 1174-8 | BLN 1174-8 | ||
| Line 3,442: | Line 1,845: | ||
I i | I i | ||
I i | I i | ||
m - | m - | ||
(a) As polished 100X | (a) As polished 100X | ||
_; - | _; - | ||
; | ; | ||
- [ | - [ | ||
-) . | -) . | ||
~I | ~I | ||
*~ - | *~ - | ||
Fig. 3-6 Specimen No. 309 (Samp1-J- | Fig. 3-6 Specimen No. 309 (Samp1-J- | ||
No. 3) | No. 3) | ||
Micrographs showing the inter-granular cracks marked by the arrow in Fig. 3-5 (b) after repolishing. | |||
Micrographs showing the inter- | |||
granular cracks marked by the arrow in Fig. 3-5 (b) after repolishing. | |||
~( , | ~( , | ||
The interference pattern in (b) was | The interference pattern in (b) was | ||
. formed by the etchant that came out of the cracks. . | |||
. formed by the etchant that came out | |||
of the cracks. . | |||
i i | i i | ||
I | I a | ||
r i - - | |||
a | |||
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/- s BLN 1174-8 | /- s BLN 1174-8 | ||
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| Line 3,495: | Line 1,874: | ||
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| Line 3,555: | Line 1,903: | ||
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3 | 3 | ||
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| Line 3,611: | Line 1,934: | ||
s,. | s,. | ||
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~ | ~ | ||
.; .< | .; .< | ||
.x; ace 100X Specimen No. 323 (Sample No. 3) | .x; ace 100X Specimen No. 323 (Sample No. 3) | ||
Fig. 3-7 Micrographs showing carbide precipitates in the base metal. | Fig. 3-7 Micrographs showing carbide precipitates in the base metal. | ||
Etched electrolytically in 10% oxalic. | Etched electrolytically in 10% oxalic. | ||
l l | l l | ||
l l , | l l | ||
l , | |||
I}} | I}} | ||
Revision as of 00:38, 1 February 2020
| ML19326B687 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/22/1975 |
| From: | Cavanaugh W, Phillips J, Reuter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B653 | List: |
| References | |
| NUDOCS 8004170527 | |
| Download: ML19326B687 (39) | |
Text
-____
- 1. Abnormal Occurrence Report No.
50-313/74-11A
- 2. Report Date: January 22, 1975 3. Occurrence Date: November 7, 1974
- 4. Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas
. S. Identification of Occurrence:
See AOR 50-313/74-11 dated 11/18/74
- 6. Cond_itions Prior to Occurrence:
Steady-State Power Reactor Power o NWth Hot Standby Net. Output 0 MWe Cold Shutdown x Percent of Full Power 0 %
Refueling Shutdown Routine Startup Operation Routine Shutdown Operation ~ .
Load Changes During Routine Power Operation " .
Other (Specify)
- 7. Description of Occurrence: -
.3 See AOR 50-313/74-11 s
%./
8004170 July 5, 1974 ,
NSP-10, Rev. O Page 1 of 3
_ _ , _ _ , - _ , . . - - . , , - < v '*- *~ ~ " ' ' '
?: . .
'~% . .
v I
Abnormal Occurrence Report No. S0-313/74-11A Sheet 2
- 8. Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Service Condition Including Installation / Environmental Construction Component Failure Operator !
Other (Specify) X
"~
\
Not determined at this time. See attached report. l
i
- 9. Analysis of Occurrence: !
See attached report. -
i
?
- 10. Corrective Action:
See attached repart. 2
"N .
s_ /
i
} July S, 1974 NSP-l'D, Rev. O Page 2 of 3 l
, - - - ~ - -- -
m .
) .
Abnormal Occurrence Report No. 50-313/74-11A Sheet 3
- 11. Failure Data:
See AOR 50-313/74-11
- 12. Reviews and Approvals: !
' ;
Reviewed and Approved by: Plant Cafety Committee Yes (X) No ( )
O Plant Superintendent
Reference:
JNA-825 Yes (X) No ( )
Date: 1/29/75 Reviewed by: /)e # Date: 7
' J'
/ Licensing' Supervisor /
Approved byl f}/' */, *. ,, / i .- Date: & ~ '/- ? T
/ afet 'Re$tfe'
~
ihee '
Approved by: q)~ M [ Date: O 3 [
h nager of Nuc, lear Ser M s ' /
Approved by: .///lrEs '-
si i ./ Date: S ~ *l .7 \
/
Director of Power Production' l
Approved by: . . -
. /$ e d- '
Date: 7-Y'74 3
,j Senior Vice Pre'sident D .
l -
l ..
l
. July S, 1974 NSP-10, Rev. O Page 3 of 3 *
. 1 P)
~. -
' ATTAClefENT TO AOR 50 313/74-11A On November 7,1974, a leak was discovered in a Reactor Building Spray System pipe of Arkansas Nuclear One-Unit ,1. The plant was being shut down following hot functional test of the primary coolant drain line, and was going into decay heat mode at the time the leak was detected.
The leak was located adjacent to a weld in line HCB-6-1. A segment of the system, including the leak, was replaced and the plant returned to operation. On November 13 a second leak was detected adjacent to a new weld which was made in.the original pipe as part of the original repair.
Subsequent leaks were also discovered in the spray pumps suction cross-over line between valves BW7A and BW7B. These leaks (labeled #3, #4 and #5 in this report) were not considered to be abnormal occurrences since that section of the pipe is isolated under normal modes required --
for spray system operation. Leak #4 was found in the weld made for the repair. of leak #3. Figure 1 is a simplified isometric showing the loca-tion of the first 4 leaks and figure 2 of leak #5. Samples of the pipe containing each of the first three pipe leaks have been forwarded to Bechtel's Materials, Fabrication .and Quality Control Services Laboratory for Metallurgical Analysis.
The following discussion describes the investigations made to date and the results. All failures except ' cracks #4 and #5 have been repaired by '
replacing a section of.the pipe. Cracks #4 and #5 have not been repaired
\s. because they are located in the non-essential crossover line and plans -
have been made to eliminate this line. The crossover line is currently
, isolated. '
Upon examination, the three leaking pipe sections showed very similar crack morphologies. All three exhibited intergranular cracking roughly parallel to circumferential butt welds in the continuous sensitized 3:
region of the Heat Affected Zone (HAZ). In all cases the cracking began
- on ID surfaces, approximately 1/4 inch from the root of the weld. The 9, microstructure of the pipe showed carbide precipitation. Both surfaces -
l exhibited a continuous network of intergranular attack approximately j 0.001 inch deep.
Intergranular stress-assisted corrosion cracks (IGSACC) of -TP-304 stain- 2l 1ess steels-at temperatures near atmospheric ambient are rare. Very j specific conditions and chemical specie. are generally required to provide !
IGSACC in sensitized TP-304 at ambient temperature. Sensitized stainless '
.s teels are. susceptible to IGSACC in nitric, sulphuric, phosphoric, hydro- ~ l chloric, hydrofluoric and naphthenic acids, in addition to certain ratios
~
~
of. SO4 "/C1~, aqueous ammonium chloride solutions and dissolved 02 Most -
of the chemical species mentioned are outside the range of water chemistry expected in the containment spray system. Pickling is known to have a detrimental effect on the intergranular stress-assisted corrosion cracking l
. 1
! i
, N.
"e 6
9
-- e, +N - p. -. , . _ . , ,-...-w ,, --,q. - - - _ ,--.,,-,,,..,,,,.-+,.,,_+,-.mv ,, , -,v_,v.,, w ,.-, ,. ,, - ,. ,,,,-4,
- ,
i
/3-
\
$ / r N_ / susceptibility of ,ensitized TP-304 sininless steel. Pickling of sensi-tized stainless s' eel provides potential crack starters in the form if intergranular attack.
The various factors in this investigation are discussed below with an estimation of their probable effect in the cracking of pipe sections.
- 1. Pipe bhterial:
The piping material is ASTM A-3S8, TP-304. By specification, "all pipe shall be furnished in the heat treated condition.
The heat treatment procedure shall consist of heating the material to a minimum of 1900*F and quenching in water or rapidly cooling by other means." Extensive microstructural examination of the cracked pipe sections revealed some sensitization. The '
heat treat condition is a significant contributor to the inter- ,,
granular stress-assisted corrosion cracking. The examination also revealed a continuous network of intergranular attack on both ID and OD surfaces of the piping. The attack was on the order of 0.001 to 0.002 inches deep and was probably caused by pickling after heat treatment. The fact that the attack on the outside and inside surfaces is the same is significant in that it indicates the attack existed prior to installation and was not caused by the service environment. This type of intergran-ular attack is believed to hasten cracking of sensitized stain 1
} 1ess steels and to provide retention of fluoride ions -from the pickling solution. Fluoride ion in very small concentrations,
'~'/ ~
1 to 400 ppm, . is known to cause IGSACC in sensitized TP-304 stainless at or near atmospheric ambient temperature.
- 2. Stress:
It is assumed that the stress component for IGSACC was due to fit-up and welding because the cracking observed has all been near >
welds, s
- 3. Water Chemistry:
The chemistry of the water to which the piping was exposed during normal operation and prior to failure will be presented in our ~
~
final report. The fluid is primar'ily borated water of varying concentrations .
The investigations included visual observations, microstructural examina-tions, sca'nning electron microscope examination of fracture surface and chemical analysis.
The results of the investigations are summarized here without reference to specific photomacrographs or photomicrographs. A pictorial review of the three cracks is presented in Appendices 1, 2 and 3. The photomacro-
,_ graphs and photomicrographs of the appendices are supported by commentary.
v) -
~
' (3
- 1. Visual Observations:
The three pipe sections which leaked were examined visually with -
magnification aid to 30X. The three sections contained cracks parallel to the circumferential butt welds. The cracks were approximately 1/4" from the root of the weld. All cracks were within the HAZ as determined by the welding heat tinting. The cracks were longer, with wider openings on the ID' surfaces, ,
indicating that they originated on these surfaces. Three addi-tional cracks originated on the ID surface which did not go all the way through the wall. Examination of both ID and OD surfaces at 30X revealed a " dried mud cracked" appearance. At crack #1, the pipe had been deformed to match the adjacent pipe fitting.
Visual examination of all three pipe sections revealed that there was a similarity of location (in HAZ), orientation (parallel to ~
weld), appearance (intergranular) and origin (ID surface).
The cracks on the' pipe perimeters are located as follows:
Looking into the pipe from the circumferential butt weld side, crack #1 was located at 12:00 o' clock, crack #2 at 7:00 o' clock, and cracks on pipe #3 were located at 1:00 o' clock, 5:00 o' clock, 7:00 o' clock and 9:00 o' clock. Those at 5:00, 7:00 and 9:00
% o' clock did not penetrate the wall.
- 2. Microstructural Analysis: '
Cross sections of all cracks and pipe base metal away from the circumferential welds were examined on a metallurgical micro-scope with magnifications up to 1000X., The results were very similar for all three pipe sections examined.
- a. He cracks originated on the ID surfaces and progressed
.1 through the pipe thickness in an intergranular manner, s here was no evidence of transgranular or mixed mode cracking.
- b. He cracking occurred in the heat-affected zone of con- __
tinuous carbide precipitation at the grain boundaries. ~
- c. The cracking was branched with secondary cracking.
- d. . De weld appeared sound with no suggestion of any object-ionable features.
- c. The longitudinal welds on all pipe sections appear to have been solution treated after planishing. H ere was no evi-dence of a heat-affected zone near these welds.
m
~
[,- ~\ ,
s_/m
- f. The base metal of all pipo sections contained continuous and semi-continuous carbide precipitation at the grain boundaries, indicating an inadequate cooling rate from the solution heat treating temperature. The carbide precipita-tion was heavier in the center of the pipe thickness than at either' surface.
-g. On both ID and OD surfaces throughout the pipe lengths, there was a network of intergranular attack at the grain boundaries. This intergranular attack extended to a depth of 0.001 to 0.002 inch. This attack was most probably caused by pickling subsequent to heat treating.
- 3. Fractog'raphic Analysis:
The fracture surface of crack #1 was examined on a scanning electron microscope. 'Ihis examination confirmed the inter-granular mode of fracture. The fracture features were sharp, indicating fracture was accompanied by very little corrosion.
- 4. Chemical Analysis:
A sample from pipe containing crack #1 was subjected to chemical analysis to specification requirements.- The analysis shows all i specification requirements for chemistry were met, although the N_ / carbon content is near the maxinum permitted. The rare earth -
metals, Cesium, Cerium and Lanthanum were present in small quantities.
- 5. Water Analysis:
A chemical analysis of water from the containment spray and decay >
heat systems will be presented in our final report.
i
- 6. Deposit Analysis:
A wipe sample of the ID surface of pipe section containing crack
- 2 was obtained before the line was decontaminated. The analysis ,
of this sample is not complete. -
~
. Field Investigation:
g A random sampic of areas adjacent to 46 welds in the building "
i spray and' decay-heat systems was examined by ultrasonic and '
! radiographic methods. Of these areas, five showed crack-like -
indications in the radiographs. It was concluded that ultrasonic testing was not a satisfactory method of examining pipe for the suspected defect and that radiography was the more satisfactory method of examination.
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The following work remains to be done:
- 1. Obtain a chemical analysis of water samples and crud from the system.
- 2. Perform modified Strauss tests on samples of the pipe to determine the effect of carbide precipitation.
- 3. Field investigation of all schedule 10 stainless steel piping to identify pipe with excessive pickling attack.
- 4. Metallurgical examination of cracks #4 and #5 and RT indications f'ollowing removal of crossover pipe.
Item 1. has been delayed due to non-availability of legal shipping con- ~~
tainers. No date is available for completion. Items 2. through 4. depend on removal of the section of crossover pipe. This removal will be accom-plished during a planned shutdown in the spring of this year. The exact date of the planned shutdown is not yet known.
In addition to the above work, Southwest Research Institute has been retained to do the following:
- a. Review the analysis performed in the Bechtel Lab and issue a report on their findings;
\_ -
- b. Perform, by microprobe technique, an analysis to identify any corrodent; l
- c. Establish a program to examine, in the field, pipe surface con-
. ditions to identify pipe that has. experienced chemical attack l due to excessive pickling; -
- d. Perform an independent metallurgical examination of cracks #4 and ,
- 5 and RT indications following removal of the crossover pipe l
- e. Examination of the surface of the pipe in the field for carbide l precipitation by a surface replica technique; _
1
- f. Propose additional investigations they believe would be advisable.
Item c has been completed. Our review of the program has not been com- '
pleted at this time. The other items depend.on the planned shutdown this spring.
In the interim, we have increased our surveillance of this system to I include a once-a-shift walk thorough examination for leaks.
Final results, conclusions and corrective action will be reported when all investigations are complete. The schedule for this final report necessarily f( ,)s depends on the planned spring shutdown for which an exact date is impossible to determine at this time.
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l APPENDICES Appendix 1 is a pictorial review of crack #1. Cracks #2 and #3 are similar
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l l APPENDIX 1 PICTORIAL REVIDV OF CRACK No. t .
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l (c) -l l Sample No. 1 Fig. 1-1 (a) The failed end of sample No. 1 with cracks marked by the arrow.
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. Fig. 1-2 Closeup views of the inside and outside surfaces showing the crack marked by the arrows in Fig.1-1 (b) and (c) .
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I V. (b) Ti.e top view of the cracked region showing flattened circumference.
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- l-4 A sketch showing th 8 I D8 of metallographic specimens.
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i l Electrolytic etch in 10% oxalic acid 15X l
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' Specimen No. 18 (Sample No. 1) to Fig. 1-5 Macrograph of specimen No. 18 showing a section through the crack as marked by the line E 4
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,.,e Electrolytic etch in 10% NaCN 14X en Specimen No. 16 (Sample No. 1) s 1 H N
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1 APPENDIX 2 PICTORIAL REVIEW OF CRACK No. 2 . .; 1 e l 3
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. Fig. 2-1 Sketch showing the locations of the samples received and the lccationr for the metallographic specimens.
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APPENDIX 3 i
PICTORIAL REVIEW OF CRACK No. 3 - O T
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(b) Specimen No. 309 15X l l I Sample No. 3 Fig. 3-5 (a) Macrograph showing a section through the crack in Fig. 3-3. (b) Macrograph showing a section through the crack in Fig. 3-4. Both electrolytically etched in 10% oxalic acid.
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Fig. 3-7 Micrographs showing carbide precipitates in the base metal. Etched electrolytically in 10% oxalic. l l l l l , I}}