ML20203A169
| ML20203A169 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/02/1985 |
| From: | BABCOCK & WILCOX CO. |
| To: | |
| Shared Package | |
| ML19292F311 | List:
|
| References | |
| A3081, NUDOCS 8604160247 | |
| Download: ML20203A169 (25) | |
Text
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EVALUATION OF THE EDDY CURRENT r
PROBE FOR OTSG SLEEVE EXAMINATIONS ii 1.
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1.0 INTRODUCTION
gEI fli An earlier study of different probe types indicated the probe II 33*
exhibited the best flaw detection capabilities in the expansion
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transition and end of sleeve areas (Reference 1). This report documents 1
P!i the inspection capabilities of a field deployable -
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inspection system.
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SUMMARY
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The best inspection procedure for OTSG sleeve examinations is a I&
combination of the bobbin coil an-II eddy current system.
The diameter bobbin coil should be used for ti the inspection of the sleeved mid span regions and the unsleeved portion
[3 of the tube. The
- il should be used for the inspection of the sleeve expansion transition areas and at the sleeve end. Using this combination, ASME size flaws in the sleeving of 20% TW or greater can be detected and quantified in the sleeve mid span. ASME size flaws in the parent tubing of 20% TW or greater can be cetected and semi-ouantified in et the unsleeveo tube and sleeved mid span.
ASME size flaws 20% throegh the
'*i sleeve or parent tube can be detected but are unquantifiable at thc-
!!3i exphnsion transitions.
An ASME size flaw 40% througn the parent tube can
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be detected but not quantified at tne sleeve end.
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3.0
, EVALUATION PROGRAM
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The evaluation program was a continuation of the earlier probe study I
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(Reference 7.1).
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Tne sleeve tubino standard used in this evaluatien are shown in Figure ig 3 1, 2 and 3.
Several dif ferent mixes were tried to further suppress the i;
sleeve end and expansion signals.
g 12 fE Sleeves with dif ferent tapered ends were evaluated to determine any
[!l increased in detectability of flaws at the sleeve end.
r8 i85 4.0 RESULTS eja
Multifrequency mixing is used to 1,3 suppress the expansion transition signals.
A3081 Page 2 h,a :.
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i:2 Figures 4 and'5 show signals from a 60% and 40% flaw in the parent tube i f using the bobbin coil Figures 6 and 7 show much " cleaner" 8i signals from the same f1aws'using the bobbin coil a lE settings.
All further evaluations were perfomed using the
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saturation.
5 Figures 8 and 9 show the 60% and 40% flaws in the parent tube mid span using the
- 4 Note the lj distortion to the signals.
The distortion is due to ID variations caused by the sleeving technique.
The probe is much more sensitive f!}
to this noise than the bobbin coil.
It was noted, however, that v)I expansion suppression mixes would also suppress this noise using the
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prob e.
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Several two and thre'e frequency combinations were evaluated for expansion e;j suppression mixes.
proved to be best for detectig us, flaws at the expansion transitions (highest signal to noise ratio).
lI The mix was repeatable in that it could always detect ASME size holes of 20%
or greater in the sleeve or parent tube at expansion transitions.
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A repeatable mix could not be generated which resulted in phase separation gga between the signals from flaws of varying depths. Therefore, the f1aws g=i could be detected but not quantified as to how deep they were.
!.12 jEl Figure 10 shows the residual expansion signal using the expansion suppression mix.
Figure 11 shows a 40% ASME size hole through the sleeve
'E8 at an expansion transition.
Figure 12 shows a 40% flaw through the its parent tube at an expansion transition. These flaws are readily a"I detectable using the o
The phase infomation indicates g,j whether the flaw is in the sleeve or parent tube.
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ggi Several two and three frequency mixes to suppress the response to the lrj sleeve end were evaluated.
2[g*i signal to noise ratio, although the signal to ncise ratio was still g
proved to give the best relatively low.
( Approximately 1 for the 40% ASME size hole).
I-by comparing the resultant signal of a 40% ASME size hole at the sleeveHowever, e2y end to a defect free sleeve end signal, the 40% flaw can be detected.
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0 1' 7l5 Note the signal shapes are somewhat different between shape of the resultant mix signal was not necessarily repeatable, eine
'ig however, each mix generated, exhibited distinct differences between the 8
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" clean" sleeve end and flawed sleeve end signals.
g; lg" Several different tapered sleeve end designs were evaluated to determine U su if using tapered sleeve ends would enhance the detection of flaws at the iy sleeve end.
3 Figures 30 through 33 show the residual sleeve end signal from a non-tapered sleeve end, a 1/4 inch long OD tapered sleeve end, a 1/4 inch long ID tapered sleeve end and a 1 1/2 inch long, 00 tapered
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sleeve end, respectively. All of the residual signals give the same general shape. The long tapered sleeve signal drif ted somewhat while the probe was in the taper, then gave the same sharp transition at the sleeve A3081 Page 4 l EVAten:3 cf
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design to another.
33*i 5.0
_ CONCLUSIONS
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Table 1 summarizes the sleeve inspection capabilities using a combinat of the 2l5 oe.
.sIl 5.1 3,g*
offers increased I!
rent tube flaws in the
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5.2 The bobbin coil gives the best examination for detection and j5 sizing flaws in the sleeve and parent tube at all areas except the
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expansions and sleeve end.
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al 5.3 The flaws at the expansions and at the sleeve end. probe gives the b
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5.4 The j$3 probe 2s
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examina tion.
j 5.5 The or parent tube at expansion transitions. probe can detect 20% ASM ggg 3in i!!
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The nj parent tube at the sleeve end. probe can detect a 40% ASME size hole in
.g 8II 5.7 Different tapers at the sleeve end do not significantly improve
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the detectability of flaws at the sleeve end.
3jg';i 6.0 RECOMMENDATIONS 8 g 6.1 12.g Inspect OTSG sleeved tubing with both a bobbin coil probe and a i g probe.
L s8 6.2 Use the' Igj and with for the bobbin coil exam, below lf n.
,for the Jjust i
' probe exam.
ljgl Compare inspection results to previous data whenever possible.
6.3
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Present and previous dati must be compared using the same mix.
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Mix on installed sleeve expansions and sleeve ends to evaluate data from other installed sleeves in the same generator.
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7.0 REFERENCES
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3 88 i 7.1 B&W technical document entitled " Interim Report of the Evaluation ei:!
of EC Probes for OTSG Sleeve Examinations", Dwg. No. 1157587, dated 6/28/85.
maj i-g 7.2 B&W technical document entitled, " Baseline Inspection of OTSG 2l.
Sleeved Tubes", Dwg. No. 1154552, dated 11/26/84.
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!eM I(3 Figure 1:
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1.69 v0LTS 238 DEG 46 %
C st,v, p o +e e Srw I
ROTATION -
M n!X 1 (5) io***S 1
, SFm
$L 3-ROTATION -
flX 2 (6) s Oaecs l..
gm ROTATIDH i
Figure 20 - 40% flaw at sleeve end I j_ ex : vE:-.l
- a. 2 aIz.
on+c.m - 5 pc eo e ca ai i
i Oa.a i n-q FREQ SPm j
ROTRTIDH -
==
O pe(L 2 FREU
'[
~
SPm ROTRTIChe -
F OD*E 3 F~EQ i
i SPm ROTATICpt -
O pett 4
- 6. % vr.A.T 19 DEG 84 j
stv. oo 5.a sF*
l ROTATION -
l 9
mix : <s) f I.
Onens Sesp RomT!ow -
nix 2 <s) l opens SPm l
y RDTATICH
,DEGl Figure 21 -
shows " clean" sleeve end,
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N
- -5 N**
i opeEL 1 me 1
2 sem
,7 RoTRTICD4 -
i
)
onut 2 i
T me --
l i
noTmio* -
\\
e 1
- _C M'
open a a
g, FG
\\
sem 7
1 ROTATION -
OWM14 me 1.32 vntTS 233 DEG 89 %
stv. ee +e.e y
stoTATION -
mix 1 (5's
,m onens sem
'st0TATION -
l cx a <s:-
Da*Et l
ROTDTICD+
Figure 22 - 40% TW flaw at sleeve end
_ m ivt-;.i. m i KsI:.'
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sem -
acTmICn.
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4.
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- noTerm i
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l l
l aarmsm opea 4
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ma i
1.83 m.:s sus DE3 40 %
l sv. eo +e.s SPW t
i normim l
nix 1 <st opens sem noTmzow -
J mx a (6)
J I
on ns
[
j
[
vee q
nurmion -
Figure 23 - 40% TW flaw at sleeve end
r 1
2 1YDT
,l. 04 1 HOEIZ,l OD*El HD - 5 BG eIDs 05HEL 1 FREG -
l i
m --
\\
4 ROTRTION 2;;
=-
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FREG -
q m-ROTATION i
I O ptEl 8 4'
FiEU -
R sem -
RUTRTIDH opeEL 4 1.71 WL TS 44 N G 9%
l k,.
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+0.0 SPN -
ROTATION I
l l MIX I (5) i Do+as
(
,SPm -
ROTATIDH NIX 2 (6) pi O p4ELS sem -
l ROTC?lth Figure 24 -
" clean" sleeve end,
,i
_ Oi 1 YDtT,! 04 1 HOE 12,l OD+G 2 - 5
. K P R0W 6 Ca.
GI DO*EL 1 l
FREQ sPCN ROTMION c
094EL 2
]
MG r
sem ROTATION 0 9 EEL 3 l
g ma i
g SPAN RUTATION Op4EL 4 I
- 1. 2f YUL Tf.,
25e M G 4e A
{
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M 7
s sem f
ROTATIG4
~
l lMIX 2 (6) u
_a
' Quecs l!
r--
--- J m -- -
i
/
7 l
f it0TATION OEG !
[
Figure 25 - 40% TW flaw at sleeve end 4
)
i 4
l
. CN 1VEPT.l. D4 3 OI:,l C""- <1 NO - 5
% e Row e Ca el l
1 OMeE1. 1 s
rREe -
I sm -
l l
4 ROTATICH -
OWeEI. 2 FRED -
SF%N -
l ROTATIDF -
f onen s C
l F3lE3 srm f
ROTATjCN -
De+EL 4 l
1.74 VOL f5 51 MG 46 P.
4 A v. oc.e.e sP5m Y
l ROTATICH -
HIX I (5) l acaens Si*
90TRTION -
HIX 2 (6) g Opens l
l POTRTICH -
saw C
Figure 26 - 40% TW flaw at sleeve end
~
tW i O',!. CH 3 HCEIZ,l C";;CL HJ E6 A DCh Op+C. 1 FREG EMN-3 c
ROTETION -
1 g
O@eE 2 i
FREQ
~-
spsw -
7 ROTETICH -
i L
i OD#El. 3 N
SPAN -
ROTRTION -
On4EI. 4 l
l 8.83 VLLli EHL DEG 40 :c y
a l_SLV. DO +e,O SF9f l
M l
l ROTATICh -
MIX 1 (5)
~
J 4r-~
_ g I
O PEELS i
sp,w __._
RGTATION -
3 MIX 2 (6)
I I l owens a
N t
I smatw -
Figure 27 - 40% TW flaw at sleeve end
C
Que(1 @ - 5 W e stok 05aeE1.1 g
f
-f _
FRED
~
SP5N -
p Q
ROTRTION -
open 2
'h
~
FitES
) __ i' J,
N sm -
= = > = -
g OpeE 3
,FRES -
SN -
ItCTRTION -
O p*EL 4
- 1. % VOL T f.
40 %
stv. 90
+a., 54 E G CA -
l
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mx: <s,
(
onens
- sm 320TATICN
- MIX 2 (6) y ouses m
l j
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Figure 28 - 400 TW flaw at sleeve end l__ 1,. Ch 1 Wrt.j, p. 3 gs j;,j nc,m-$
l pG e g3.
l joO+E 1 FitEG s
~
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~
CM*C 2 o
N 30TATION -
j OG+C. 3 i
,FREQ -
r i
sm 4
1-amm::= -
l NE4 6.L5 vot.TL 74 EG G% ~
LstV. EO
+* to SN i
k ROTRTIO4 -
~
R MIX 1 (5) 1 oa.as e
- s. -
f L.-
IlmATION -
I O'
fflX 2 (6)
! wsN -
g i
1
! ammIm -
Figure 29 -
shows " clean" sleeve end, 1
o.
2 m'... > ; G.
O'e c_ @ - apre ?
,ID e sta.
l r
7
==
C_~'l
- om -
4 I
}W-I
- 201ATICes ll
[
t I i t
I l g
l 4
L"5 1
I con-1 I
I g F"tEO -
\\
- sw -
-j l
g
. MWh l
l RIGA.51 oun-FRrr., -
su -
6.54 vta. TS 56 MG 6%
RCTATION
}
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)
j l
t pm i
g aat - >
r
__ e or on.
i L
__I_
2:4h I_
_.).u-se i
L u,
k !
?
Figure 30
" Clean" non-tapered sleeve end
. > - - e...- : s.
xnc s - -:n e i
- , e% +ca e
==
a one -
I i !IO. -
j KTG Ices g
i
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\\
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O 1
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i
, RST;.T:Ca.
l
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l r x_o n f:
I 3
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t MTATIM i
I s
]
f l2TI'P.'E*.
i l
3
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i l e of 00+
3 j
g g
1: F:.
I l
- w. = =. e.a.
I i
(
,I e
i.
L-r I-i I
f s
i t
Figure 31
" Clean" 1/4 inch long OD tapered sleeve end u.
- - 2.p.,
- .< _.., s. _,
,,3, i
g.
cw 7
$J b.
!one i
SPQH -
l l
%l l RotaT!a i
L I
l i
L i
l un_:
on.e l
4 i
nra -
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f I
sm -
8 g j{
i
~
emIm j
)
}
l I #!G" !
- i a
1 On.e il*5 i
i ms -
I
- e. s va.is, sm -
av.rm
.e., e oco. -
l Rcm!m.
i I
.L.
t l
in
_ne_s 1
i l
g
~
I e of CW i
l l
- l.
1 l
I
}
/
l i
L?
I h
a i
j l
i~
Figure 32
" Clean" 1/4 inch long ID tapered sleeve end
! f
- 8 *7
! m i HmI:.i
- > m a.o _ 6 g,,
l IDD+E. 2 l
I i
IFREG -
f SP$N ----
f
- 801AT10, 8
I i
On+C. 2
}
i i
ma -
g l
(
\\
E m-p tjy no urlm I
l On+E. 3 4
l N --
q a
SPSH ~
,RUTRTIDH I
l On+0. 4 l
i I
~
me 1
j N34' W
- 4. O l sP5N g
l ROTRTIDH
,f, s
j d
MIX ! (5) i i
oo+us 1
4 I
sw 1
s
~
l J
>RDTRTION MIX 2 (&)
, I.
on+o.s
(
4 sm i
+
era,I,.
Figure 33
" Clean" 11/2 inch long OD tapered sleeve end l
l