ML20081K069
| ML20081K069 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 12/20/1994 |
| From: | Devan M, Harbison L BABCOCK & WILCOX CO. |
| To: | |
| Shared Package | |
| ML20081K059 | List: |
| References | |
| 51-1235147, 51-1235147-00, NUDOCS 9503280384 | |
| Download: ML20081K069 (36) | |
Text
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a ATTACHMENT 1 to JPN-95-016 l
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BWNT Document No. 51-1235147-00 CERT Testing of Type XM-19 in Simulated BWR Environment i
December 1994 i
(Non-Proprietary Version) j i
New York Power Authority JAMES A. FITZPATRICK NUCLEAR POWER PLANT l
Docket No. 50-333 DPR-59 i
+
9503280384 950321 PDR ADOCK 05000333 p
r BWNT-204404(11/89)
ENGINEERING INFORMATION RECORD Document identifier 51-1235147-oo Title CERT Testino of Tvoe XM-19 in Simulated BWR Environment PREPARED BY:
REVIEWED BY:
Name L.
S.
Harbison Name M.
J.
Devan Date 2-19.W Signature M O, i[
Date 11/zo/44 Signature dd NanfM Technical Manager Statement: Initials 2
/ M ##'
Reviewer is Independent.
Remarks:
The following document provides an evaluation of the constant extension rate testing (CERT) of the Type XM-19 stainless steel bar material procured for the James A.
Fitzpatrick and Oyster Creek core shroud repairs. The evaluation covers five air CERT tests and twelve simulated BWR environment CERT tests at 550*F.
i Page 1
of 35
1;0 Introduction-Type XM-19. stainless steel in' the hot-rolled condition has been procured for use by New York Power Authority (NYPA) in H
the James A. Fitzpatrick (JAF) core shroud' repair and by GPU l
Nuclear Corporation--(GPUN) in the Oyster Creek core shroud repair. To qualify the Type XM-19 material, CLI International' I
has - been contracted, in a dual-funded program by -NYPA and i
GPUN, to perform mechanical and physical. testing to show the behavior of the material in a simulated boiling water reactor (BWR) environment.
Fully sensitized Type 304 stainless steel was included in the program for control purposes.
Mechanical-l testing of the Type XM-19 and-Type 304 materials. included constant extension rate testing (CERT) in - both air and' simulated boiling water reactor (BWR) environments.
The Type i
304 material was also subjected to physical testing that i
included testing in accordance with ASTM A 262,
" Standard i
Practices for Detecting Susceptibility to Intergranular Attack l
in Austenitic Stainless Steels," Practice A.
- This report 1
presents the results of the mechanical and physical testing as reported by CLI International.2 i
2.0 Experimental Procedure l
2.1 Materials
^
Three heats of Type XM-19 stainless steel bar and one heat of Type 304 stainless steel bar were supplied to CLI International for testing.
Table 1 identifies the heats and the suppliers.
Heats 1 and 2 are to be used by NYPA i
and Heat 3 is being used by GPUN in their respective core j
shroud repairs.
i Table 1 - Bar Materials Used in CERT Tests i
Material Identification Material Condition supplier Heat 1 Type XM-19 Hot-Rolled BWNT Heat 2 Type XM-19 Hot-Rol. Led BWNT Heat 3 Type XM-19 Hot-Rolled GPUN Heat 4 Type 304 Solution BWNT l
Annealed f
51-1235147-00
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Page 2 of 35 1
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All heats of Type XM-19 stainless steel were load conditioned.
Heats 1 and 2 were load conditioned to 105
+0,
-5 ksi by CLI; Heat 3 was load conditioned to 80 kai prior to receipt by CLI.
Heat 4
was not load conditioned.
Following'. load conditioning (if applicable), the bars were sectioned for preparation of the various heat-treated conditions that were to be tested.
Table 2 describes the various conditions for the bars used in this test program.
Table 2 - Bar Material conditions Material Identification Condition Heat 1 AR LTS Heat 2 AR Heat 3 AR LTS Heat 4 FS LEGEND:
- As-Received (load conditioned)
LTS - Low-Temperature Sensitized (heat treated at 1275 i 25*F for 10 + 1,
-0 minutes, followed by water quench; final heat treatment at 932 i 10*F for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, followed by furnace Cool)
FS
- Full Sensitization (heat treated at 1250 i 10*F for one hour, followed by furnace cool) 2.2 Physical Testing The Heat 4 material was tested in accordance with ASTM A 262-93a, " Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels,"
Practice A.
51-1235147-00 Page 3 of 35
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2.3 Mechanical Testing-
'E Mechanical testing consisted of CERT testing at 550 t 5 F-in.both air and simulated BWR environment (see Table 3).
A strain rate of 2.0 x 10-s in/in/sec was used for each j
test.
The tension test specimens consisted of round, l
0.150 inch diameter, specimens with a gage length of.
- t 1.000 1 0.005 inches.
Inspection of the as-received i
specimens, however, revealed the gage lengths to be less than the specified dimension.
The short gage lengths were discovered after some specimens.were tested. 'It is' i
difficult to determine the gage lengths of the specimens tested prior to the discovery.
Therefore, all data presented in this report assume a gage length of 1.0 l
inch; this assumption will yield conservative elongation values.
i Table 3 - Simulated BWR Environment Specif3 cation
'l Parameter' Influent Effluent Halogens (ppb)
< 50
< 50
[
Oxygen (ppm) 811 7.5 i 1.5 l
Conductivity (gS/cm) 0.2 - 1.0
< 1.0 3.0 Experimental Results 3.1-Physical Testing
{
The-Heat 4 fully. sensitized material was etched with j
oxalic acid in accordance with ASTM A'262-93a, Practice i
A.
The resulting microstructure (Figure 1) exhibits a ditched structure indicating a sensitized stainless steel material.
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Figure 1 - Type 304 Stainless Steel Bar Ditched Structure (500X) 3.2 Mechanical Testing l
Five specimens have been tested in air and twelve i
specimens have been tested in the simulated BWR i
environment.
Tabia 4 lists the specimens and the order of testing.
Tables 5 through 8 show the data derived from the air and BWR tests for Heats 1 through 4,
respectively.
In these tables, the material properties of the as-received specimens in the simulated BWR envircament are compared to the performance of the as.
received specimens in air for time-to-failure (TTF),
plastic elongation, and reduction in area.
For the case of the low-temperature sensitized specimens tested in the 2
simulated BWR environment (Heats 1 and 3), comparison is j
made to the as-received specimens also tested in the i
simulated BWR environment.
Wherever two environment j
tests are compared to two air tests, or two other environment tests (e.g.,
LTS specimens compared to AR specimens in BWR environment for Heat 1), the ratios of TTP, plastic elongation, and reduction in area are shown for each of the standards and are separated by '/'.
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51-1235147-00 Page 5 of 35 11 l,
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Table 4 - Order of Specimen Testing as Indentified by Test Frame and Test Number Air Autoclave 1 Autoclave 2 Frame / CERT #
Frame / CERT #
Frame / CERT #
Heat 3 AR/3824-2-8 Heat 3 AR/3828-3-9 Heat 4 FS/3829-3-10
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i Heat 3 AR/3826-2-8 Heat 1 AR/3834-2-9 Heat 3 AR/3833-4-10 Heat 1 AR/3831-1-8 Heat 3 LTS/3835-5-9 Heat 1 AR/3E36-3-10 i
IIsnt 4 FS/3837-4-8 Heat 2 AR/3840-1-9 Heat 1 LTU/3841-4-10 Heat 2 AR/3842-2-8 Heat 4 FS/3846-5-9 Heat 2 AR/3845-3-10 i
Heat 1 LTS/3847-5-9 Heat 3 LTS/3849-6-10 t
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3.2.2 Heat 2, XM-19 Stainless Steel Bar i
51-1235147-00 Page 6 of 35
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a 3.2.4 Heat 4, Type 304 Stainless Steel Bar Table 8 compares the results of CERT testing of I
Heat 4
in 550*F air and the simulated BWR environment at 550*F.
All test specimens reported in Table 8 were in the fully sensitized condition.
Where the properties of the Type XM-19 materials 51-1235147-00 Page 7 of 35
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wereprevIouslydescribedassimilarregardlessof the ' environment, the Type 304 ' material : exhibits
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significant and drastic changes in behavior between i
the air and the simulated BWR environments.
The i
UTS~of the specimen tested _in air (CERT # 3837-4-8) l is nearly double the UTS of the average of the specimens tested in the simulated BWR environment 1
(CERT #'s 3829-3-10 and 3846-5-9).
The plastic j
elongation and the reduction in area of the specimen tested in air is-also significantly j
greater than the specimens tested in the simulated j
BWR environment, indicating a significant loss in.
i ductility due to the simulated BWR environment exposure.
The air test specimen exhibited no-secondary. cracking, while the BWR environment i
specimens showed extensive environmental and secondary cracking..
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Page 8 of 35 i
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4 Table 5a - Test h5ata for Heat 1, Type XM-19 As-Received (AR) Bar Material in Air and Simulated BWR Environments Note:. Elongations correspond only to the plastic component.
TTF = Time-to-failure RA = Reduction in Area 51-1235147-00 Page 9 of 35
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Table 5b - Test Data,for Heat 1, Type XM-19 As-Received (AR) and Low-Temperature Sensitized (LTS) Bar Materials.in Simulated BWR Environment i
Note:
Elongations correspond only to the plastic component.
TTF = Time-to-failure RA = Reduction in Area 51-1235147-00 Page 10.of 35
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Table 6: - Test Data for Heat 2, Type XM-19
.f As-Received (AR).Bar Material in Air and Simulated BWR Environments i
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Elongations correspond only to the plastic component.
l TTF = Time-to-failure RA = Reduction in Area
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Type XM-19 As-Received (AR) Bar Material in Air and
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Simulated BWR Environments i
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Note:
Elongations correspond only to the plastic component.
TTF = Time-to-failure RA = Reduction in Area
- Identified ~in error by CLI as 4280-1-4 l
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Page 12.of 35 l
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Table 7b - Test Data for Heat 3, Type XM-19 ll As-Received (AR) and Low-Temperature Sensitized (LTS) Bar Materials in Simulated BWR Environment j
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Note:
Elongations correspond only to the plastic component.
TTF = Time-to-failure RA = Reduction in Area l
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Page 13.of 35
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1 Table 8 - Test Data for Heat 4, Type 304 Fully Sensitized (FS) Bar Material in Air and Simulated BWR Environments i
Material Condition FS FS FS CLI Identification No.
4280-4-FS 4280-3-4 4280-5-FS CERT Identification No.
3837-4-8 3829-3-10 3846-5-9 Environment Air a 550*F BWR 9 550*F BWR 9 550*F Initial Diameter (in) 0.147 0.151 0.151 Initial Gage Area (in')
0.017 0.018 0.018 Maximum Load (lbs) 1586 775 987 UTS (ksi) 93.4 43.3 55.1 Fracture Load (lbs) 1032 232 458 Min. Final Dia. (in) 0.076 0.147 0.134 Max. Final Dia. (in) 0.083 0.150 0.136 8
Fracture Area (in )
0.005 0.017 0.014 Environmental Cracking No Yes Yes Secondary Cracking No Yes Yes TTP (hrs) 78.2 25.5 35.7 TTF/TTF in air 1.00 0.33 0.46 Elongation (%)
55.0 16.9 23.5 Elong./Elong. in air 1.00 0.31 0.43 RA (%)
70.8 3.3 20.1 RA/RA in air 1.00 0.05 0.28 Note:
Elongations correspond only to the plastic component.
TTF = Time-to-failure RA = Reduction in Area 1
51-1235147-00 l
Page 14 of 35 l
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3.3 Metallography
[
Figures 2
through '11 show _ photomicrographs of_ the fracture surface for each CERT specimen tested.
Each l
metallographic mount was prepared first by removing the fracture surface.
This section was ground to remove approximately one-half of the diameter.
After mounting i
this piece-in Bakelite, polishing would allow secondary I
cracking, if it exists, to be identified under light i
microscope observation.
All mounts were etched with 10%
oxalic acid.
3.3.1 Heat 1, Type XM-19 Stainless Steel Bar l
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3.3.3 Heat 4, Type 304 Stainless Steel Bar Figure 15 shows the fracture surface of the Heat 4 l
fully sensitized specimen tested in air (CERT #
3837-4-8).
At 20X magnification -(Fig.
15a),
j fracture is shown to have occurred within the-
' necked region and is typical of ductile fracture.
l At higher magnification (200X) of the shoulder l
region (Fig.
15b),
no secondary cracking is evident.
Figures 16 and 17 show the fracture surfaces of the
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two Heat 4 fully sensitized specimens tested in the l
simulated BWR environment (CERT #'s 3829-3-10 and l
3846-5-9, respectively).
At 20X ' magnification (Figs. 16a and 17a) cracking is shown in the gage sections of 'each specimen; cracking is very extensive in Fig. 16a.
In addition, no necked i
region has occurred in the specimens and the i
failure appears brittle.
At 200X magnification',
f Fig. 16b shows the intergranular cracking typical of occurring along the gage section of-the specimen; the cracking is clearly intergranular in nature.
In Fig.17b (also at 200X magnification),
the final fracture appears to be a result of l
intergranular separation.
Brittle-type fractures of these sensitized materials have occurred as a i
result of the simulated BWR environment.
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51-1235147-00 l
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Figure 2 - Heat 1, As-Received, Tested in Air At 550*F, CERT # 3831-1-8. a) 20X, b) 200X.
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Page 18.of 35
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Heat 1,
As-Received, Tested in Figure 3 Simulated BWR Environment At 550*F, CERT #
3834-2-9. a). 20X, b) 200X.
51-1235147-00 Page~19 of 35
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As-Received, Tested in.
I Figure. ' 4 Simulated BWR Environment At 550*F, CERT #
I 3836-3-10. a) 20X, b) 200X.
51-1235147-00 i
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Tested in Simulated BWR Environment At 550*F, i
CERT # 3841-4-10. a) 20X, b) 20,0X.
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CERT # 3847-5-9. a) 20%, b) 200,X.
51-1235147-00 Page 22 of 35
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As-Received, Tested in Simulated BWR Environment At 550*F, CERT #
3840-1-9. a) 20X, b) 200X.
51-1235147 Page 24.of 35
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Heat 2,
As-Received, Tested in Figure 9 Simulated BWR Environment At 550*F, CERT #
1 3845-3-10. a) 20X, b) 200X.
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Figure 10 - Heat 3, As-Received, Tested in Air At 550*F, CERT # 3824-2-8. a) 2,0X, b) 200X.
51-1235147-00 Page 26 of 35
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As-Received, Tested in Figure 11 Simulated BWR Environment At 550*F, CERT #
3828-3-9. a) 20X, b) 200X.
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3833-4-10. a) 20X, b) 200X.
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T Sensitized, Tested in Simulated BWR Environment At 550*F, CERT # 3849-6-10.
a)
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Fully Sensitized, Tested in Simulated BWR Environment At 550*F, CERT #
3829-3-10. a) 20X, b) 200X.
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e Figure 17 - Heat 4, Fully Sensitized, Tested in Simulated BWR Environment At 550'F, CERT #
3846-5-9. a) 20X, b) 200X.
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51-1235147-00 Page 33.of 35
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I 4.0 Discussion By performing. CERT ' tests,[ judgement of ~ the ability of_ a material to perform tin a selected" environment is 'made'byl comparirig performance-i~ "the;": selected- ~ enviroiiment"" to" ' -
-~ _
s n
performance in air'..'Wh.en a material exhibits drastic changes in properties When ' tested in the~ environment, such as decreased TTF, elongation, and reduction in area, the material can be considered unacceptable for use in the environment.
Because of the well-known behavior of Type 304 stainless steel in BWRs and CERT tests, this material was selected to be the control material for this test program.
Testing the'
~
sensitized Type 304 material in.the. simulated BWR environment-also served to verify the aggressiveness of the environment.-
In the sensitized condition, Type 304 stainless steel is susceptible to intergranular stress corrosion cracking.
Testing a sensitized Type 3.04 specimen in air, however, will not yield a significant change in properties.
As shown in
- air, a sensitized Type 304 specimen exhibits extensive elongation.(55%) and reduction in area (71%).
As seen in Table 8,
testing, sensitized. Type. 304 in the simulated 1 BWR.
environment results in significantly lower values compared to the ' specimens. tested in. air
[TTF - ( 67.% - and 54%
less)',-
elongation (69% and'57% less), and reduction in area _.(95% and -
72% less)].
Sensitized Type 304 material ~is' unacceptable for; use in a BWR environment, as is well known and documented'.
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l 51-1235147-00 Page 34 of 35
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.5.0
. conclusions 4 ;
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5 I As'.'tihe control material, tihe sensitized. Type 304 'staihilek.
s"
.i>
Cateel material demonstrat'ed howlan unacceptable material'would
. _ _..<._.4:E. a.:-,_: behav'e ' int-a4BWR4 environmentW [:.TheStabul'ated':"tsechatilcal*--
properties showed significant reductlon :in properties ~ compared l
to the sensitized" material tested in air, and the microscopy of the environment specimen revealed intergranular fracture i
and a brittl~e failure mode.
P r
T i
i
[
n J6.0 References.
C
- -r 1.
' American Societh for.Testiilg and' Mdterials" Standard A' 262-93a, " Standard Practices for Detecting Susceptibility i
to Intergranular Attack in Austenitic Stainless Steels,"
Philadelphia, PA.
2.
" Final Report: Corrosion Resistance of XM-19 and 304 Stainless ~ Steel in Laboratory Simulated BWR Conditions,"
CLI International, BWNT Document No. 58-1017934-00, B&W Nuclear Technologies, Inc., December 1994.
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I 51-1235147-00 i
Page 35 of 35
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