ML19324B270
| ML19324B270 | |
| Person / Time | |
|---|---|
| Site: | Farley, 05000000 |
| Issue date: | 03/02/1988 |
| From: | Taylor J BROOKHAVEN NATIONAL LABORATORY |
| To: | Conway J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19324A112 | List: |
| References | |
| CON-FIN-A-3866, FOIA-89-334, FOIA-89-335, FOIA-89-336, FOIA-89-337 NUDOCS 8911030029 | |
| Download: ML19324B270 (18) | |
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- BROOKHAVEN NATIONAL LABORATORY 0 ' ' ASSOCIATED; UNIVERSITIES,ilNC.":
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Department of Nucleor Energy; FTS 666' 7005
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7 March 2, 1988 '
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Mr." James Conway; i U.S. Nuclear Regulatory Commission - Vendor Programs Branch Mail'Stop 9D4 Washington, DC- 20555 ay Reft Testing of Farley Bolting Materials, Fin A-3866, Task Asuignment 9 *
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! . . Dear Jim L h n. ' '
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f. Enclosed is four copies of a report on the metallurgical evaluation of five
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bolts that had been obtained from the Farley plant and tested by C.J. Czajkowski of BNL. These five bolts (S0-18 through S0-21'and S0-23) had originally been 'out a y , of specification after the' original tensile and chemical testing. The results of , the testing are
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S0-18 Exceeded chromium level and had below maximum carbon level. (Notes insuf ficient carbon level was inadvert.ently not identified in the pre-vious report.). This bolt is considered " suitable for service" after reevaluation and examination. t
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' SO-19 : Exceeded chromium levels. The.s bolts are consi<iered "suiuble for
~ Through- service" after reevaluation and examination.
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S0-21 S0-23: Exceeded maximum hardaess. This bolt is considered acceptable af ter retesting in accordance with ASTM A370-77. t
'7 If there are any questions, please feel free to call. j,r.. ;
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'WStaf , John H. Taylor, Group Leader #
Encl. Plant Systems & Equipment Analysis j. cc: E. Baker, NR C. Czajkowski ; B. Grenier, NRC R. Hall W. Kato W.1 Shier J. Stone, NRC
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8911030029 891030 PDR FOIA g/r/ g MCGRATH89-334 PDR 3
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BROOKHAVEN, NATIONAL ~ LABORATORY. ,
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FROM: C.J.'CZajkowski(FTS 666-4420) " ,: m<
. suancT Retesting' of Bolts S0-19 through S0-2 and S0-23 for USNRC I, l& -
Pursuant with Task Order No. 9 under FIN A-3866, please find attached copies of metallurgical evaluations for bolts identified as S0-18 through S0-21 and S0-23. These bolts had previously been found (nty memo to you 10/20/87) to be out of specification after the original tensile and chemical i testing. The-results of the retesting are: S0-18: Exceeded chromium level and had below maximum carbon level. (Note: insufficient carbon level was inadvertently not identified in 10/30/87 report.) This bolt is considered " suitable for service" i t after reevaluation and examination. S0-19 thrugh S0-21: ' Exceeded chromium levels. These bolts are con-sidered " suitable for service" after reevaluation and examination. r S0-23: . Exceeded maximum hardness. T ,is bolt is considered accept-able after retesting in accordance with ASTM A370-77. h;? This completer Task 9.under FIN ' A-3866. Four additional copies of the If there are any quest 9ons, d'
. report are attached for transmittal to the NRC. N please contact me at the above number.
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O # BOLT IDENTIFICATION: .50-13l .80LT SPECIFICATION:'; A193-87 L ".,,'1
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TENSILE STRENGTH:
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I 1 e Actual Required by Specification ' f
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142.22 ksi '125 ksi (min.)'
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Failure Location - Threads [ c
' HARDNESS:
Actual Required by Specification 59.16 R A Not Required:
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CHEMICAi. ' ANALYSIS: Actual w/o Required by Specification w/o t 0.37 - 0.49
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Carb'on 0.34 (Note 2) ! 1' ~ Manganese 0.96 0.65 - 1.10 i '4 "
.; Phosphorus 0.12 0.035 max l.i . Sulfur 0.006 0.040 reax ;
n ' Silicon 0.28 0.15 - 0.35 Chromium 1, 1.55 (fbte 1) 0.75 - 1.20
' Nickel 0.06 - E Molybdenum 0.19 0.15 - 0.25 (0
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1;. Vanadt um <0.05 - 4L iColumbium + Tantalum <0.05 - U L
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C0i9 TENTS: 1) Chromium value exceeds specification requirements even factoring
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L after factoring permissible variation. Note: inadvertently not identified on original 10/30/87 report.
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METALLURGICAL EVALUATION n
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, BOL7 IDENTIFICATION: S0-18 BOLT SPECIFICATION: ' A193-B7 .f.
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" ' BOLT' SIZE: 3/4 10 UNC s
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- 1. A section was cut from the boh, mounted in epoxy, then metallurgically l ground, polished and etched (2% Nial). The section showed (Figure 1) a 3,!
tempered martensite microstructure consistent with this type of material. il r 2. Half _ of the fracture face (after tensile testing) was- examined under the scanning election microscope (SEM) (Figure 2). The resulting fractograph A,. showed a _ dimpled rupture appearance which indicated good ductility in the "i <' fracture. ,, m
Conclusions:
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Ti : bolt is considered to be suitable for service for the following reasons: ~
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- 1. The polished section showed a microstructure consistent for this grade of bolt. The SEM examination revealed that the fracture (after tensile
- testing) was' ductile in nature. This coupled with the fact that the bolt -j 4 met the tensile requirements of A193-B7 material and was only 0.01% below
- the minimum carbon level and 0.35% above the maximum chromium level (all other chemical requirements were met) leads one to believe that the ten- W '
sile requirements will not be a problem for this bolt. The only other y major consideration would be if the bo?t could fail in a brittle (as . l opposed to ductile) manner in service (Notch Toughness) due to these chem- .@f ical composition variances, .de
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L The Metals Handbook, 8th Eoition. Vol. 1. Properties and Selection of PI% l Metals, defined Notch Tdughness as:: ; e ,
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...the ability of a metal to yield plastically under high ?
localized stress, such as might occur at the root of a notch... %.. , 4pf*' L
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This measure of a material's property would be very applicable to j C i fasteners. 4 > u l , Carbon Content I.t. l This same reference mentions that as carbon content is raised in the range. c from 0.15 to 0.80% in normalized plain carbon steels, the notch tonghness L decreases- (at room temperature). This lowering of energy absorption is s. y ! accompanied by a subsequent raising of the transition tamperature (6*F per 0.01% increase in carbon content above 0,30% carbon). The net effect of ds r ~ this lower amount of carbon on this particular bolt would then be to i increase the amount of energy absorbed and decrease the transition temper-ature as much as 6'F. Both of which should be beneficial to the bolt's
" suitability for service."
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( BOLT IDENTIFICATION: 50-18 BOLT SPECIFICATION: A193-B7 .;
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Chromium Content-
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The Metals Handbook, 8th Edition, .Vol. '1, Properties and Selection of
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Since the impact properties should not be sigr.ificantly impaired due to the
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. higher chromium content, the bolt is considered " suitable for service."- ,
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BOLT IDENTIFICATION:' S0-19 . BOLT SPECIFICATION:, A193,87 q y
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TENSILE-STRENGTH: 'T
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Actual Required by Specification
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143.03 ksi 125 ksi (min.). ' t Failure Location - Shoulder ;
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HARDNESS: ..
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27.6 R Not Required C ;j i
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. . CHEMICAL APALYSIS:
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Actual w/o Required by Specification w/o
.
o' Carbon. -0.40 9.37 - 0.49 ?
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Hanganese- 0.98 0.65 - 1.10 $, Phosphorus' O.005 ' O.035 max Sulfur. 0.016 0.040 max W_ - Silicon
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0.21 0.15 - 0.35' Ch romium 1.80 (No,te 1) 0.75 - 1,90 !'
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0.34 r.
- Molybdenum 0.19 0.15 - 0.25 ii ;
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a COPMENTS: 1) Chromium value exceeds specification requirements even factoring 3,,fA l -' n ' i in permissible variations (0.05% over) '
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BOLT. IDENTIF.ICATION: S0-19 BrLT SPECIFICATION: A193-B7 , A +,
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BOLT SIIE: 1"- 8 UNC y l:p Methodology: Y ,
- 1. A section was cut from the bolt, mounted in epoxy, then metallurgically '.
ground, polished and etched (2% Nital). The section showed (Figure 3) a p+
+
tempered martensite microstructure consistent with this type of material.
- 2. Half of the fracture face (after tensile testing) was examined under the Z scanning election microscope (SEM) (Figure'1). The resulting fractograph showed a dimpled rupture appearance which indicated good ductility in the fracture.
Conclusions:
The bolt is considered to'be suitable for. service for the following reasons:
- 1. The polished section showcd a microstructure consistent for this grade of bolt. The SEM examination revealed that the fracture t'after tensile .
1 testing) was ductile in nature. These observations plus the fact that the bolt met the tensile requirements and all of the chemical requirements
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.t (except chromium) of the specification leads one to examine the ability of the bolt to resist rapid failure (notch toughness).
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Chromium Content
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The Metals Handbook, 8th Edition, Vol. 1, Properties and Selection of Metals, states: .*.
" Chromium has slight effect on tran ition temperature..." g!
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- B0LT IDENTIFICATION: { $02 20 , '80LTSPECIFICATI0m/A'193-87:3. I
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BOLT SIZE: 3/8" - 16 UNC 9,
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TENSILE STRENSTH: i WG Actual Required by Specification' M- ;.. 151.74 ksi 125 ksi (min.) :. l 4
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HARDNESS: g Actual Required'by Specification tg 23.83 R Not Required c CHEMICAL ANALYSIS: .. I f Actual w/o Required by Specification w/o ,n
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- 1 Carbon 0.41 0.37 - 0.49 l- ' Manganese 0.97 0.65 - 1.10 .(f),
Phosphorus <0.005 0.035 max , v; Sulfur 0.008 0.040 max nl Silicon 0.27 0.15 - 0.35 N-ll, Chromium 1.51 (Note 1) 075 1S
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Nickel- 0.05 -- QI.il Mt j Molybdenum 0.22 0.15 - 0.25 c>; Vanadium <0.05 -
.A -:
I Columbium +' Tantalum <0.05 - i
; 4
<e. . , -
dh,
..
< = Less than .s f ' l. ,
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-t C0tWENTS: 1) Chromium value exceeds specification requirements even factoring r, 1 g. in permissible variations (0.05% over) fi,
.
.. y s
,
.
k
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I METALLURGICAL EVALOATION M
'
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.
BOLT IDEKIIFICATiON: S0-20
- BOLT SPECIFICATION: 'A193-B7 N'
; e
,
'
4-B0LT SIZE: . 3/8" - 16 UNC a; Methodolony:
,
- 1. A.section was cut from the bolt, mounted in epoxy, then metallurgically ground, polished and etched (2% Nital). The section showed (Figure 5) a tempered martensite microstructure consistent ~with this type of material.
'
- 2. Half of the fracture face (after ten:ile testing) was examined under tht scanning election microscope (SEM) (Figure 6). The resulting fractograph showed a dimpled rupture appearance which indicated good ductility in-the '(
fracture, t
Conclusions:
.
The bolt is considered to be suitable for service for the following reascns:
- 1. The polished section showed a microstructure consistent for this gra:le of '
bol t. The SEM examination revealed that the fracture (after tensile ( testing)wasductileinnature. These observations plus the fact that the ~ bolt met the tensile requirements and all of the chemical requirements (except chromium) of the specification leads one to examine the ability of the bolt to . dst rapid failure (notch toughness). > Chromium Content
'
- . ,
'
L The Metals Handbook, 8th Edition, Vol. 1, Properties and Selection of ' ! Metals, states:
" Chromium has slight effect on transition temperature..." !
,
- l. Since the impact properties should not be significantly impaired due to E
'
l the higher chromium content, the bolt is considered " suitable for c
.. service."
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.EBOLT IDENTIFICATION: s50-21,).'
;r BOLT'.SPCCIFICATION: JA193,87) > . , .e.
' H. 3
-
- -
; ,
.
, ,
,
, ,
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j
'm - a
- e . BOLT SIZE: 1/4" - 20 UNC ,u r ,. ,
. ,
..fg k.
n - m.
-
,
.:
~ .u;.
TENSILE STRENGTHt
- '
m,,
'
Actual Required by Specification 'it-
, .
,
- k.
,,
'
d A fc 158.80 ksi 125 ksi (min.)' <
* ,
,
, ,
! 4'
'
, , Failure Location ~- Threads
- y. .
HARDNESS:
- , - , .
t
"
Actual Required by Specification 62.'6 R Not Required A
,
CHEMICAL' ANALYSIS:
'
Actual w/o Required by Specification w/o 4
>
Carbon 0.41 0.37 - 0.49
. Manganese 0.94 0.65 - 1.10 g 7 Phosphorus 0.020 0.035 max la Sulfur 0.024 0.040 max % "
Silicon 0.27 0.15 - 0.35 l Chromium 'e 1.4C (f;t,tt.1) 0.75 - 1.20 ' M<
.
l Nickel ' O.47 - l Molybdenum- 0.23 0.15 - 0.25 f, Vanadium <0.05 - 'i 4 Columbium + Tantalum <0.05 - E>
'
. e-;
.. .-
- d.
s9
-
< = Less than 7 .'-
l,
- 1) Chromium value exceeds specification requirements even factoring
, o C0t91ENTS:
dk ( l 'f 1; . in permissible variations (0.05% over) L ..
.n i? " V;,
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'1
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METALLURGICAL EVALUATION .n
-
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'
,
l '(
.
-
( , r DOLT IDENTIFICATION:. S0-21 BOLT SPECIFICATION: 'A193-B7 A
-
, &r_
~
liQ S0LT SIZE: 1/4"-20UNC Y
.
M: :f.
>
Methodology: f... ;
- 1. A section'was cut from the bolt, mounted in epoxy, then metallurgically 7
ground, polished and etched (2% Nital). The section showed (Figure 7) a .;j tempered martensite microstructure consistent with this type of material. ~ L 2. Half'of the fracture face (after tensile testing) was examined under the ' scanning election microscope (SEM) (Figure 8). The resultin0 fractograph
,
showed a dimpled rupture appearance which indicated good ductility in the
-
fracture. I
Conclusions:
,
'
The bolt is considered to be suitable for service for the following reasons: I 1. The polished section showed a microstructure consistent for this grade of bolt. The SEM examination revealed that the fracture (after tensile { testing)wasductileinnature. These observations plus the fact that the bolt met' the tensile requirements and all of the chemical requirements , (except chromium) of the specification leads one to examine the ability of ," the bolt to resist rapid failure (notch toughness). 4?gC
- Chromium Content
, The Metals Handbook, 8th Edition, Vol. 1, Properties and Selection of ,' l Metals, states: ,
-
A .a4 " 1: " Chromium has slight effect on transition temperature..." Ls L Since the impact properties should not be significantly impaired due to L the higher chromium content, the bolt is considered " suitable for 4;. : E
. service." g
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- n. 'B0LT IDENTIFICATION: $0-23 BOLT SPECIFICATION: , , ,A 193-88 i g .. ' .gjf
<
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-
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ff[ ' 30LT SIZE: 5/8" - 11 UNC ti th .v I TENSILE STRENGTH: .
'
h Actual Required by Specification
'Y l
.
~
'
L .
- 9) i
! 89.65 ksi 75 ksi (min.)
- .
, Failure location - Threads . ~ l n , , i l [ ., i HARDNESS: ' , 1
.
Actual Required by Specification
'
k 63.6 RA (Note 1) 223HB(max.) 4
(equates to 262 HB) 1
' I' 0*
CHEMICAL ANALYSIS: i 1
.
Actual w/o Required by Specification w/o q Carbon 0.06 Manganese 1.75 0.08 max 2.00 max 3 Ja l Phoschorus - < Sulfur-0.050 (Note 2) 0.021 0.045 max 0.030 max tf1 V7 ' 2.,, Silicon 0.72 1.00 mn f
-
Cnromium 19 0 18.00'- 20.00 9+
. Nickel 9.0 8.00 - 10.50 -
Molybdenum M.. L 0.40 - Vanadium Columbium + Tantalum
<0.05
<0.05
-
T
..
-
4A,l
,;;$1
< ' Less than 'i[ .n a
,f.' l k
%~, a 1 COMENTS: 1_) Although specification allows a maximum hardness of 241 HB %' ,
1 (A193). this bolt exceeds hardness maximum. 2) Permissible variation for l phosphorus (0.010% over) by specification allows acceptance of this value. A < l
- y. .
_ _ . _
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ETALLURGICAL EVALUATION ^ o, , ,. o y. . ..w. o : . ~ n: . . n. . - x:,
. .
,
'^
*
,
; ,
;
BOLT IDENTIFICATION: S0-23 BOLT SPECIFICATION: A193-88 %,' gy t, BOLT SIZE: '5/8" - 11 UNC 4
$lt ,
E
' Methodology:
F U 4. >>,
,>
- 1. A section was cut from the bolt, mounted in epoxy, then metallurgically 3
- ground, polished and etched (electrolytic oxalic acid). The section dgy, showed (Figure 9) an austenitic microstructure consistent with this type
,
of material. y-
- 2. Half of the fracture face (after tensile testing) was examined under the "
SEM (Figure 10). The resultant fractograph showed a dimpled rupture ' appearance which indicates good ductility. f,
'
- 3. Consistent with the requirements of ASTM A370-77, a transverse section through the bolt was cut and six hardness ' readings taken along the axial :
. length.
E
Conclusions:
M.'
?
I 1-
\
The bolt is considered to meet specification (ASTM A193-81a) requirements
'
k.. , after hardness retesting. The specification requirements allow a maximum . ':
,
! hardness of 223HB (with a maximurr hardness of 241HB allowed for 3/4" diameter g
,.
and smaller bolts), the six hardness retests showed the following hardnesses: L RB 82, 83, 82, 85, 79, 88.5 j RB. 89.5, equates to 18,1 HB ,
- y All of which are below the specification maximum. *
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