ML20105A776
| ML20105A776 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 01/18/1985 |
| From: | Warembourg D PUBLIC SERVICE CO. OF COLORADO |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| P-85017, NUDOCS 8502040506 | |
| Download: ML20105A776 (35) | |
Text
,
r public Servlee Company *H'Odonde January 18, 1985 Fort St. Vrain Unit No. 1 P-85017 i
Regional Administrator b.
Region IV
.l Nuclear Regulatory Commission JAN 2 3!985 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 p
Attention: Mr. Eric H. Johnson DOCKET No.
50-267
SUBJECT:
Bearing Debris Analysis
REFERENCES:
- 1) G-84392, H. R. Denton to R. F. Walker, dated 10/16/84
- 2) P-84290, O. R. Lee to E. H. Johnson, dated 8/21/84
Dear Mr. Johnson:
This letter fulfills Public Service Company's commitment, as stated in Reference 2, to provide coni.rol rod drive orifice assembly (CRDOA) debris analysis information prior to restart.
PSC has had chemical analysis performed by GA Technologies (Attachment 1) and Accu-Labs
- Research, (Attachment 2) on the CRDOA shim motor bearing ultrasonic cleaning solution and debris found on the CRDOA housing.
Bearing Debris PSC analyzed several samples of the bearing cleaning solution only to discover that the samples were contaminated by the cleaning solution itself.
The cleaning solution may have masked the results somewhat, but the analysis still indicates that all but two of the major constituents can be attributed to the bearing materials (Attachment 6). The two exceptions are lead and tin which were the major contaminates in the cleaning solution. Two noncontaminated samples, from CRD0A serial numbers 44 and 7, were also obtained.
The results of this analysis verified that the major debris constituents could all be attelbuted to the materials of the bearing construction. Some of the miror constituents such as flourine, titanium, tungsten etc.
were identified by the motor manufacturer as being constituents or contaminants which could be attributed to the motor.
PSC performed these tests in an attempt to prove or disprove the
~
concept that the six CRD0As which failed to scram resulted from ]M moisture washing foreign particulate matter into the races of the 05 7
E k^# O RI b/5'N L' s 6
h50m 8
PDR D ky
=
- +
.- CRDOA ' shim motor bearings. Since there is a high concentration of
~
sodium.and/or boron found on the housing adjacent to tha shim motor,
.if a. transport mechanism existed, these constituents should be' found in ' tne. bearing. debris analysi s.
Sodium is present on the-housing due to the leaching of the black oxide coating on the CRDOA gear train.
The boron is leached from the biological shield which is a component of the CRDOA. Since.large quantities of; sodium and/or boron were not found. in the bearing. debris samples the wash-in-theory was not
- supported.
Due
~
~
to.the method of acquisition and the-quantity of material
- available, PSC has_ determined that a meaningful bearing debris particulate size analysis can not be performed. However, we have
.obtained some idea of. particle size by filtering the debris solution.
'A one-half micron filter successfully removed the particulate from solution, while this filter does not provide the exact measurement of the particulate involved, it does provide a general indication of-size. Approximately one (1) gram of particulate is required for subsize sieve testing. Since only extremely small quantities (<< 1 gram) are obtained from the cleaning solution, a meaningful particle size analysis test could not be performed.
In an attempt to determine if there was any adhered particulate on the surface of the bearing race and the general condition of the race, PSC-performed a scanning electron microscope (SEM) analysis. The SEM. was -performed on the inner race of CRD0A serial. number 37 shim motor bearing. The scan (refer to Attachment 3) did not identify.any' particulate adhesion and only minor surface wear was detected.
General CRDOA Debris 3
In addition-to the above, PSC has investigated the chemical composition and particle size of _'the generalf. CRDOA ' housing debris.
In most' cases, any. appreciable amount of debris that was obtained had to be scraped 'off the housing. The chemical analysis indicates, that-
-the scrapings and dust were essentia11y' rust with a high. content of sodium and boron.(Attachment 4). The ia gest rust flakes,. scraped off --the ring ' gear. pinion housing of~CRD0A serial ~ number lai, were
'approximately 0.0625;to 0.125 inches. However, the. average' particle
. size in.this -sample appears to be approximately.02 inches,and the debris is relatively uniform'in size. Although this sample has not' been ' chemically ' analyzed it appears to consist of rust, molybdenum
~
- disulfide,'and a'few silicon particles.
LSubsequent to chemical analysis, the remaining sample of1CRD0A serial-number 44 was examined' utilizing'aL stereomicroscope ati 165x. cThei largest : particle.found by this method'was approximately 0.003 inches (Attachment 5; ' Figure 7). - A SEM analysis.was then performed ' on the same - CRDOA 44 : housing debrisL(Attachment 5). The. average particle.
size was 0.003 = inches. ~ -The : largest particle 1found ~was l approximately - ~
0.009 inches.
~
,ps-..
..p
3 --
- In conclusion, transport of debris from the housing into the shim motor bearings has not been substantiated. Therefore, the CRDOA rust has been discounted as a potential cause of the June 23, 1984_ failure to scram. However, the internally generated CRDOA bearing debris can not be discounted as the potential cause of the scram failures.
If you have any further questions, please contact Mr. M. H. Holmes at (303) 571-8409.~
Very truly yours f-D. W. Warembourg DW/MJF/ksc Attacnments
9 C
ATTACHMENT 1 G. A. BEARING DEBRIS CHEMICAL ANALYSIS
P-85017 Page 1 of 3 SPECTRCGRAPLEIC ANALYSIS CRD MOTOR BEARING DEBRIS CRD SN44 CRD 44-1 CRD 44-2 BEARITE OUTSIDE BEARING ELEMENT 8/14 8/17 8/17 8/21 RESIDUE PPM PPM PPM PPM AG N
N 300 50 AL 600 1000 1000 300 1.1 B
N 30 30 N
CA N
N
>10000 N
1.1 CD N
300 1000 N
C0 N
N N
N 0.5 CR 300 300 2000 3000 4
CU 2000 3000
>10000
>10000 22 FE 1000-1000
>10000
>10000 22 HG 10 30 3000 10 MN N
100 1000 100 1.5 MO 2000 1000 10000
>10000
.2 NA N
N N
N NI N
N 1000
>10000 0.22 P
N N
10000 N
PB
>10000
>10000
>10000 300 1.5 SI 300 300
>10000 200-0.11 SN
>10000
>10000
>10000
>10000 1.5 0.02 W
ZH H
N
>10000 N
i 4
l
s.
P-85017 Page 2 of 3 (cont'd)
SPECTRCGRAPHIC ANALYSIS CRD MOTOR BEARING DEBRIS Inside Bearing
'CRD 7 New Bearing 14 Element Residue Residue Solvent Residue PPM 9089-18548-3-1 Qualitative AG 2400 AL 0.5 Minor N.D.
Trace B
~
N.D.
l CA 2
i Trace CD
>10000 CO 2
Minor
>10000 CU 10 Minor
>10000 FE 15 Minor 60 MG 0.5 2100 MN 1.5
>10000 MO 2
Trace N.D.
Major 1500 NA NI 0.3 Minor P
N.D.<1 PPM
>10000 PB 2
900 SI 0.4 Trace SN 1.5 Trace N.D.>5 PPM
>10000
>10000 W
N.D.
2N J
6 4
l i
,__y..
P-85017 Page 3 of 3 i
l SPECTROGRAPLHIC ANALYSIS CRD MOTOR BEARING DEBRIS (cont'd) 4 CRD 19 CRD 19 GT CRD 7 Element C3D 19-B002' Brake End Evaporated 18,34,36 Residue Solvent Residue PPM Qual.
Qual.
AG AL 5400 2
B N.D.
CA N. D..
2 CD CO 3000 0.2 CR 4800 1.5 Minor CU 6000 5
Minor Majer FE
>10000 15 Minor
~ Major MG 1320 1
Mn 1200 2
I MO
>10000 10 Minor Minor NA N.D.
NI 1800 0.5 P
PB
>10000 2
Major Minor SI 3000 2
SN
>10000 1.5 Major Minor N
4800 2N N.D.
s ATTACHMENT 2 ACCU-LABS BEARING DEBRIS 4
CHFliICAL ANALYSIS
P-85017 Accu-Labs Research, Inc.
Q,71 of 3 11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303) 423-2766 To: Mr. Vic Lucero Date: August 31, 1985 Public Service Co. of Colorado ALR No.: 9098-18594-3-1 Fort St. Vrain Purchase Order No.:
Nuclear Power Station Concentration In: ug/ml 16805 County Rd.191/2 Brake End Platteville, CO 80651 Sample Identification No.: Bearing 019 Uranium Terbium Ruthenium Vanadium Thorium Gadolinium Molybdenum '0.13 Titanium 0.019 Bismuth Europium Niobium Scandium Lead NR Sanarium Zirconium Cal cium 0.065 Thallium Neodymium Yttrium Potassium 0.022 Mercury NR Praseodymium Strontium Chl orine 0.072 Gold Cerium Rubidium Sul fur 0.25 Platinum Lanthanum Bromine 0.001 Phosphoru s 0.081 Iridium Barium 0.001 Selenium Silicon 0.23 Osmium Cesium Arsenic Aluminum 1.1 Rhenium Internal Iodi ne Germanium Magnesium 0.005 Standard Tungsten 0.003 Tellurium Gallium Sodium 0.032 Tantalum 0.004 Antimony Zinc 0.016 Fl uorine 0.023 Hafnium Tin NR Copper 0.14 0xygen NR Lutetium Indium Internal Nickt;1 0.010 Nitrogen NR Standard Ytterbium Cadmium Cobait 0.006 Carbon NR Thulium Silver Iron 0.63 Boron Erbium Palladium Manganese 0.003 Beryllium Holmium Rhodium Chromium 0.037 Lithium Dysprosium NOTES: All elements for which values are not entered <0.001 ug/ml NR - Not reported.
This sample is scheduled to be disposed of four months after the date of this report.
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P-85017 At2achment 2 Accu-Labs Research, Inc.
se 2 of 5 7
11485 W. 48th Avenue Wheat Ridge, Colorado 80033 l
(303) 423-2766 i
To: Mr. Vic Lucero Date: August 3i,1984 Public Service Co. of Colorado ALR No.: 9098-185W5 2 Purchase Order No.:
Concentration In: pg/n1 Sample Identification Mo.: Inboard 034 Uranium Terbium Ruthenium Va nadium 0.004 Thorium Gadolinium Molybdenum 0.22 Titanium 0.048 Bismuth Europium Niobium Scandium Lead NR Sanarium Zirconium Cal cium 0.19 Thallium Neodymium Yttrium Potassium 0.065 Mercury NR Praseodymium Strontium 0.002 Chl orine 0.12 Gold Cerium Rubidium Sul fur 0.69 Platinum Lanthanum Bromine 0.002 Phosphorus 0.041 Iridium Barium Selenium 0.003 Silicon 0.40 Osmium Cesium Arsenic 0.001 Al uminum 1.6 Rhenium Internal Iodine Gennanium Magnesium 0.014 Standard Tungsten 0.071 Tellurium Gallium Sodium 0.033 Tantalum 0.004 Antimony Zi nc 0.026 Fluorine 0.046 Hafnium Tin NR Copper 1.6 0xygen NR Lutetium Indium Internal Nickel 0.010 Nitrogen NR Standard Ytterbium Cadmium 0.003 Cobalt 0.026 Carbon NR Thulium Sil ver 0.003 Iron 1.4 Boron 0.007 Erbium Palladium Manganese 0.017 Beryllium Holmium Rhodium Chromium 0.38 Lithium Dysprosium NOTES: All elements for which values are not entered <0.001 pg/ml NR - Not reported.
This sample is scheduled to be disposed of four months after the date of this report.
Y 0(.<
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P-85017 Accu-Labs Research, Inc.
SE 73 or 5 11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303) 423-2766 To: Mr. Vic Lucero Date: August 31, 1984 Public Service Co. of Colorado ALR No.: 9098-18594-5-3 Purchase Order No.:
Concentration In: ug/ml Sample Identification No.: Outboard 036 Uranium Terbium Ruthenium Vanadium 0.002 Therium Gadolinium Molybdenum 0.17 Titanium 0.038 Bismuth 0.001 Europium Niobium 0.002 Scandium Lead NR Senarium Zirconium 0.002 Calcium 0.12 Thallium Neodymium Yttrium Potassium 0.11 Mercury NR Praseodymium Strontium Chl orine 0.53 Gold Cerium Rubidium Sul fur 0.69 Platinum Lanthanum Bromine 0.003 Phosphoru s 0.083 Iridium Barium Selenium 0.003 Silicon 1.1 Osmium Cesium Arsenic Aluminum 6.6 Rhenium Internal Iodine Ge manium Magnesium 0.014 Standard Tungsten 0.10 Tellurium Gallium Sodium 0.094 Tantalum 0.009 Antimony Zinc 0.022 Fluorine 0.10 Hafnium Tin NR Copper 29 0xygen NR Lutetium Indium Internal Nickel 0.020 Nitrogen NR Standard Ytterbium Cadmium 0.004 Cobal t 0.026 Carbon NR Thulium Silver Iron 3.2 Boron 0.011 Erbium Palladium Manganese 0.021 Beryllium Holmium Rhodium Chramium 0.56
' Lithium Dysprosium NOTES: All elements for which values are not entered <0.001 pg/ml NR - Not reported.
This sample is scheduled to be disposed of four months after the date of this report.
f01-
.x Am
P-85017 Accu-Labs Research, Inc.
E
! or s 11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303) 423-2766 To: Ms. Mary Fischer Date: August 24, 1984 Public Service Co. of Colorado ALR No.:
9089-18548-3-1 Fort St. Vrain Nuclear Purchase Order No.:
N-5608 Power Station Concentration In:
ug/ml 16805 County Rd.191/2 Bearing No. 14-Platteville, CO 80651 Sample Identification No.:
Inside Uranium Terbium Ruthenium Vanadium 0.003 Thorium
<0.014 Gadolinium Molybdenum 0.22 Titanium 0.091 Bismuth 0.17 Europium Niobium 0.002 Scandium Lead NR Samarium 0.001 Zirconium 0.001 Calcium 0.49 Thallium 0.001 Neodymium 0.039 Yttrium Potassium 0.072 Mercury NR Praseodymium 0.006 Strontium 0.057 Chlorine 0.31 Gold Cerium 0.011 Rubidium Sul fur 1.4 Platinum Lanthanum Bromine 0.003 Phosphonis 0.20 Iridium Barium 0.005 Selenium Silicon 0.26 Osmium Cesium Arsenic 0.10 Alumi num 0.91 Rhenium Internal Iodine 0.001 Gemanium Magnesium 0.010 Standard Tungsten 0.13 Tellurium Gallium Sodium 0.037 Tantal um 0.010 Antimony 0.085 Zinc 0.40 Fluorine 0.26 Hafnium 0.007 Tin NR Copper 1.8 0xygen NR Lutetium Indium Internal Nickel 0.11 Nitrogen NR Standard Ytterbium Cadmium Cobalt 0.029 Carbon NR Thulium Silver 0.011 Iron 1.7 Boron 0.005 Erbium Palladium Manganese 0.022 Beryllium Holmium Rhodium Chromium 0.64 Lithium Dysprosium NOTES: All elements for which values are not entered <0.001 ug/ml.
-NR - Not reported.
This sample is scheduled to.be disposed of four months after the date of this report.
j y
Llo.
w
P-85017 Accu-Labs Research, Inc.
y,2;,,,
11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303) 423 2766 To: Ms. Mary Fischer Date: August 24, 1984 Public Service Co. of Colorado ALR No.:
9089-18548-3-2 Purchase Order No.:
N-5608 Concentration In:
ug/ml Bearing No. 022-Sample Identification No.: Outside Liquid Uranium Terbium Ruthenium Vanadium 0.002 Thorium
<0.008 Gadolinium Molybdenum 0.015 Titanium 0.016 Bismuth 0.050 Europium Niobium Scandium Lead NR Samarium Zi rconium Calcium 0.099 Thallium Neodymium 0.039 Yttrium Potassium 0.051 Mercury NR Praseodymium 0.008 Strontium 0.001 Chlorine 0.59 Gold Cerium 0.017 Rubidium Sul fur 0.38 Platinum Lanthanum 0.001 Bromine 0.003 Phosphoru s 0.046 Iridium Barium 0.005 Selenium Silicon 0.26 Osmium Cesium Arsenic 0.070 Aluminum 0.18 Rhenium Internal Iodi ne 0.002 Gennanium Magnesium 0.044 Standard Tungsten 0.011 Tellurium Gallium Sodium 0.074 Tantalum 0.002 Antimony 0.085 Zi nc 0.29 Fluorine 0.78 Hafnium Tin NR Copper 3.5 0xygen NR Lutetium Indium Internal Nickel 0.048 Nitrogen NR Standard Ytterbium Cadmium Cobalt 0.006 Carbon NR Thulium Silver 0.001 Iron 0.44 Boron 0.003 Erbium Palladium Manganese 0.007 Beryllium Holmium Rhodium Chromium 0.043 Lithium Oysprosium l
NOTES: All elements for which values are not entered <0.1 pg/ml.
l NR - Not reported.
l This sample is scheduled to be disposed of four months af ter the date of this report.
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M l
a ATTACHMENT 3 SCANNING ELECTRON MICROSCOPE ANALYSIS ON THE INNER RACE OF CRD0A SERIAL NUMBER 37
P-85017
'l INTER-DEPARTMENT MEMO-- PUBLIC SERVICE COMPANY OF COLORADO.
QAC-84-0826
- DATE:
December 19, _ ~ 1984 TO:
Mr. R. L. Craun, Supervisor, Nuclear Site -Engineering, FSV FROM:
R. L. Hellner, Sr. QA Engineer, FSV SUBJ:
-SEM ANALYSIS OF CRD BEARING The shim motor bearing from CRD serial #37_was submitted for scanning-electron microscopic examination. The bearing was_ cut into_. sections for examination.
The -sections were-~ decontaminated by ultrasonic cleaning in a solution of a alconox soap.
The bearing contact surface of the outer race was examined and shallow defects were. observed as shown in Figures'1, 2, and 3.
These defects had the appearance of pits, but are not thought to have been caused by corrosion since they are smooth rather than rough.
For comparison a new bearing was examined, the bearing contact surface of the other race is shown.in Figure 4.
/b/ b
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FIGURE 4 160 X l
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ATTACHMENT 4 GENERAL CRDOA DEBRIS CHEMICAL ANALYSIS (G.A. and Accu-Labs)
F-85012/
CRD 7 Accu-Labs Rosaarch, Inc.
Pag 3 1 of 6 11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303) 423 2766 To: Mr. Vic Lucero Date: August 31, 1984 Public Service Co. of Colorado ALR No.: 9098-18594-5-5 Purchase Order No.:
Concentration In: ppm wt.
Debris fran Sample Identification No.:
CR0 No. 7 Uranium
<0.20 Terbium Ruthenium Vanadium 21 Thorium
<0.24 Gadolinium <0.20 Molybdenum 110 Titanium 25 Bismuth
<0.25 Europium Niobium 0.80 Scandium 0.20 Lead 0.70 Samarium
<0.23 Zirconium 0.53 Cal cium 36 Thallium
<0.24 Neodymium
<0.16 Yttrium
<5.7 Potassium = 2400 Mercury NR Praseodymium Strontium 390
. Chl orine
= 1400 Gold Cerium Rubidium 0.30 Sul fur
>1%
Platinum Lanthanum 0.23 Bromine 12 Phosphorus >1%
Iridium Barium 5.2 Selenium 13 Silicon 700 Osmium Cesium Arsenic 8.5 Aluminum
= 1%
Rhenium Internal Iodine 0.68 Gemanium 0.26 Magnesium 42 Standard Tungsten 22 Tellurium Gallium 0.54 Sodium
>1%
Tantal um 3.0 Antimony 1.5 Zi nc 17 Fluo rine
>1%
= 0.5%
0xygen NR Lutetium Indium Internal Nickel 120 Nitrogen NR Standard Ytterbium <0.28 Cadmium 1.1 Cobalt 2.2 Carbon NR Thulium Silver 1.5 Iron 510 Boron
= 1000 Erbium
<0.18 Palladium Manganese 2.5 Beryllium
<0.18 Holmium Rhodium Chronium = 1900 Lithium 0.22 Dysprosium NOTES: All elements for which values are not entered <0.1 ppm wt.
NR - Not reported.
This sample is scheduled to be disposed of four months after the date of this report.
ae
P-85017 Accu-Labs Rosearch, Inc.
E e 2 or 8 4
11485 W. 48th Avenue Wheat Ridge, Colorado 80033 (303)423 2766 To: Ms. Mary Fisher Date: November 21, 1984 Fort St. Vrain ALR No.:
9098-19044-2-2 Public Service Co. of Colorado Purchase Order No.:
N-5733 Concentration In:
ppm wt.
Sample Identification No.: CRD No. 44 Uranium 0.44 Terbium Ruthenium Vanadium 8.5 Thorium
<0.60 Gadolinium
<0.24 Molybdenum >1%
Titanium INT Bismuth 21 Europium Niobium 1.6 Scandium 0.10 Lead 70 Samarium
<0.25 Zirconium 30 Calcium 110 Thallium 0.35 Neodymium 0.26 Yttrium 0.43 Potassium 27 0 Mercury NR Praseodymium 0.22 Strontium 3.7 Chl orine 720 Gold Cerium 0.80 Rubidium 0.26 Sul fur
= 1400 Platinum Lanthanum 0.35 Bromine 22 Phosphoru s 19 0 Iridium Barium 46 Selenium 9.4 Silicon
= 0.5%
Osmium Cesium Arsenic 37 Aluminum
= 0.5%
Rhenium Internal Iodi ne 0.77 Germanium 1.4 Magnesium = 1200 Standard Tungsten 12 Tellurium 0.26 '
= 1600 Tantal um 0.72 Antimony 8.3 Zinc 140 Fluorine 83 Hafnium 1.1 Tin 460 Copper 400 0xygen NR Lutetium Indium Internal Nickel 27 0 Nitrogen NR Standard Ytterbium
<0.28 Cadmium
<17 Cobalt 38 Carbon NR Thulium Sil ver
<4.5 Iron
>1%
= 1800 Erbium
<0.30 Palladium Manganese = 0.5%
Beryllium Holmium Rhodium Chromium = 1300 Lithium 55 Dysprosium NOTES: All elements for which values are not entered <0.1 ppm wt.
NR - Not reported.
INT - Interference by a major component spectrum.
hI:b O-
P-85017 i
Accu-Labs Research, Inc.
Qe 3 of 6 5
11485 W. 48th Avenue Wheat Ridge, Colorado 80033
)
(303) 423 2766
)
To: Ms. Mary Fisher Date: November 21, 1984 Fort St. Vrain ALR No.:
9098-19044-2-1 Public Service Co. of Colorado Purchase Order No.:
N-5733 16805 W. County Rd.19 1/2 Concentration In:
ppm wt.
Platteville, CO 80651 CRD No. 5 l
Sample Identification No.: Bag 2 Uranium 0.44 Terbium Ruthenium Vanadium 8.5 Thorium 1.6 Gadolinium
<0.24 Molybdenum 120 Titanium 250 Bismuth 0.60 Europium Niobium 3.2 Scandium 0.45 Lead 35 Samarium 0.35 Zirconium 30 Cal cium
= 1100 Thallium
<0.28 Neodymium 0.51 Yttrium 0.57 Potassium 140 Mercury NR Praseodymium 1.1 Strontium 14 Chl orine 480 Gold Cerium 5.4 Rubidium 0.13 Sul f ur 240 Platinum Lanthanum 2.3 Bromine 7.2 Phosphorus = 3100 Iridium Barium 590 Selenium 9.4 Silicon
>0.5%
Osmium Cesium Arsenic 37 Aluminum
>1%
Rhenium Internal Iodine 0.39 Germanium 1.2 Magnesium = 1200 Standard Tungsten 3.7 Tellurium 0.11 Gallium 1.3 Sodi um 800 Tantal um 1.5 Antimony 3.3 Zinc 210 Fluorine 29 0 Hafnium 2.6 Tin 22 Copper 400 0xygen NR Lutetium Indium Internal Nickel 18 0 Nitrogen NR Standard Ytterbium
<0.28 Cadmium 3.9 Cobalt 38 Carbon NR Thulium Sil ver 0.64 Iron
>1%
= 1800 Erbium
<0.30 Palladium Manganese = 0.5%
Beryllium Holmium Rhodium Chromium 150 Lithium 35 Dysprosium NOTES: All elements for which values are not entered <0.1 ppm wt.
NR - Not reported.
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l ATTACHMENT 6 MATERIALS OF BEARING CONSTRUCTION
P-85017 Page 1 of 1 Materials of Bearing Construction Ball Tungsten Carbide Gr. 25 93.5-94.5 Tungsten Carbide 6.5-5.5 Cobalt Outer Race / Inner Race AISI 440C 0.95-1.20 Carbon 1.0 (max)
Manganese 1.0 (max)
Silicon 16.0-18.0 Chromium 0.0 Nickel 0.04 (max)
Phosphorus 0.03 (max)
Sulfur 0.75 (max)
Molybdenum Retainer Ring AISI 430 0.12 (max)
Carbon 1.0 (max)
Manganese 1.0 (max)
Silicon 16.0-18.0 Chromium 0.04 (max)
Phosphorus 0.03(max)
Sulfur Retainer Nitra11oy 135 Mod AMS 6472 0.38-0.43 Carbon 1.6 Chromium 0.35 Molybdenum 1.13 Aluminum Ring Bearite (Spectrocraphic Analysis) 50 ppm Silver 300 ppm Aluminum 3000 ppm Chromium 10,000 ppm Copper 10,000 ppm Iron 10 ppm Magnesium 100 ppm Manganese 10,000 ppm Molybdenum 10,000 ppm Nickel 300 ppm Lead 200 ppm Silicon 10,000 ppm Tin
- - - -