ML20203A169

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Evaluation of Eddy Current Probe for Once-Through Steam Generator Sleeve Exams
ML20203A169
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 08/02/1985
From:
BABCOCK & WILCOX CO.
To:
Shared Package
ML19292F311 List:
References
A3081, NUDOCS 8604160247
Download: ML20203A169 (25)
v • d • e


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e t.a j; EVALUATION OF THE EDDY CURRENT r PROBE FOR OTSG SLEEVE EXAMINATIONS ii 1.

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1.0 INTRODUCTION

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fli An earlier study of different probe types indicated the II probe 33* exhibited the best flaw detection capabilities in the expansion {

transition and end of sleeve areas (Reference 1). This report documents 1

P!i the inspection capabilities of a field deployable -  ; robe and j!? inspection system.

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31 2.0

SUMMARY

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" 3} 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 1

I ti the inspection of the sleeved mid span regions and the unsleeved portion l

[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 '

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!* 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 et parent tubing of 20% TW or greater can be cetected and semi-ouantified in  !'

,;. 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

I!! be detected but not quantified at tne sleeve end.

'8iI 3.0

j{ , EVALUATION PROGRAM

'UEe 1 i!! The evaluation program was a continuation of the earlier probe study I a;! (Reference 7.1).

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ig 3 Tne sleeve tubino standard used in this evaluatien are shown in Figure 1, 2 and 3.

i; Several dif ferent mixes were tried to further suppress the g sleeve end and expansion signals.

12 fE Sleeves with dif ferent tapered ends were evaluated to determine any

[!lr8 increased in detectability of flaws at the sleeve end.

, i85 4.0 RESULTS eja

[g The previous OTSG sleeve inspection technique employs the bobbin coil and i 3g (Reference 7.2). Multifrequency mixing is used to 1,3 suppress the expansion transition signals.

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!! Figures 4 and'5 show signals from a 60% and 40% flaw in the parent tube if 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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5 Figures 8 and 9 show the 60% and 40% flaws in the parent tube mid span

4 using the lj distortion to the signals. The distortion is due to ID variations Note the by the sleeving technique. The caused probe is much more sensitive f!}

v)I to this noise than the bobbin coil. It was noted, however, that

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expansion suppression mixes would also suppress this noise using the prob e.

5t! 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). The lI

< ! ', 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.

[ij. repeatable mix could not be generated which resulted in phase separation A

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.

!jEl .12 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 itso parent tube at an expansion transition. These flaws are readily a"I detectable using the

  • 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. proved to give the best g

2[g*i signal to noise relatively low. ratio, although the signal to ncise ratio was still I- ( Approximately 1 for the 40% ASME size hole).

e2y by comparing the resultant signal of a 40% ASME size hole at the sleeveHowever, 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 eine

'ig shape of the resultant mix signal was not necessarily repeatable, 8

g; however, each mix generated, exhibited distinct differences between the

" clean" sleeve end and flawed sleeve end signals.

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su Several different tapered sleeve end designs were evaluated to determine iy 3 ifsleeve usingend.

tapered sleeve ends would enhance the detection of flaws at the

,.. 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 i 1/4 inch long ID tapered sleeve end and a 1 1/2 inch long, 00 tapered jg,gl 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

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end as exhibited by the other sleeve end designs. No significant lg ;j increase in signal to noise ratios were observed from one sleeve end i} .

design to another.

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_ CONCLUSIONS

.5:; Table of the 1 summarizes the sleeve inspection capabilities using a combinati 2l5

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ys rent tube flaws in the t} 5.2 j5 The bobbin coil gives the best examination for detection and

=; sizing flaws expansions andinsleeve the sleeve end. and parent tube at all areas except the I* '

al 5.3 The

g flaws at the expansions and at the sleeve end. probe gives the b ~

! 5.4 The j$3 probe

  • 2s examina tion.

,  !;e:j 5.5 The ggg or parent tube at expansion transitions. probe can detect 20% ASM 3in i!! 5.6. The nj

.g parent tube at the sleeve end. probe can detect a 40% ASME size hole in 8II 5.7

{!! 3 Different tapers at the sleeve end do not significantly improve the detectability of flaws at the sleeve end.

jg';i 6.0 RECOMMENDATIONS 8

g 6.1 ig Inspect OTSG probe. sleeved tubing with both a bobbin coil probe and a 12.g L

s8 6.2 Use the' Igj and with for the bobbin coil exam, below ,for the i Jjust

' probe exam.

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[ jgl Compare inspection results to previous data whenever possible.

. Present and previous dati must be compared using the same mix.

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t I 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

3 88 i 7.1 B&W technical document entitled " Interim Report of the Evaluation of EC Probes for OTSG Sleeve Examinations", Dwg. No. 1157587, ei:! 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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.II DETECTION 202 20Z 20: 2CZ 20% 20%

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!eM I(3 Figure 1: Sleeved GTSG Tubing Standard A egn*

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_g v. o o +e.e 84 DEG 46 %

srm

ROTATIDH -

l MIX 1 (5)

Dams l sPm

- ROTATION -

MIX 2 (O Dams um f , ROTATION -

Figure 19 - 40% W flaw at sleeve end

_ Q1 1 VERT ,I. Cu 1 H0RIZ .l l

DOeEL60 - S P 0 ROW F

) 090EL 1

/

FREQ ~

3 b A- SPN ROTATION -

Op*EI. 2 i

N p

a s ROTRTICM -

1 O G4EL 3 FRED-

  • SPFed i

3 ROTATION -

1 1 0 00EL 4

  • 1 FREQ 1.69 v0LTS 238 DEG 46 %

C st,v, p o +e e Srw I

ROTATION -

M 1

_ n!X 1 (5) io***S

, SFm

$L 3- ROTATION -

flX 2 (6) s

-- Oaecs gm l.. i ROTATIDH 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

'[ F ROTRTIChe -

! OD*E 3 F~EQ i

i SPm ROTATICpt -

O pett 4

6. % vr.A.T 5 19 DEG 84 j stv. oo .a sF*

l ROTATION -

l 9 mix : <s)

Onens f I. Sesp RomT!ow -

; nix 2 <s)
_ l opens SPm l y RDTATICH ,DEGl Figure 21 -

shows " clean" sleeve end,

_ m : ,or .i_ m i nI: .! N *-5 N**

opeEL 1 i 1  % me 2 . #

,7 sem RoTRTICD4 - i

)

onut 2 l T '

i me -- i l

e noTmio* - \

open a g,

1 a

  1. _C 7

M' FG sem ROTATION -

\

1 OWM14 1.32 vntTS 233 DEG 89 % me stv. ee +e.e y stoTATION -

,m mix 1 (5's onens sem

- 'st0TATION -

l cx a <s:-

. Da*Et l ROTDTICD+

l Figure 22 - 40% TW flaw at sleeve end

_ m ivt-; .i. m i KsI: .' "M NCe - 5 %9h J, __

e <

W'No -

% *.- )

sem -

acTmICn.

1-

. onen a j FRETe

4. sem -

!  ; noTerm i 094R 3

&- MQ )

ls l sem - \

e l l l aarmsm

, opea 4 \

1 ma i

l sv.1.83 eom.:s+e.ssus DE3 40 % SPW

  • t i normim l nix 1 <st opens sem

' _._ noTmzow -

J mx a (6)

J I

on ns vee

[ j

[ q nurmion -

Figure 23 - 40% TW flaw at sleeve end

r l

1 2 1YDT ,l. 04 1 HOEIZ ,l OD*El HD - 5 BG eIDs 05HEL 1 FREG - i l m -- \

2;;

4=- ROTRTION O peel 2

% i FREG -

q m-ROTATION i I

O ptEl 8 '

4' FiEU -

R . sem -

RUTRTIDH opeEL 4 1.71 WL TS 44 N G 9%

-> SLV. DO +0.0 SPN -

l k,.

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 6 Ca. GI

. K P R0W DO*EL 1 l FREQ sPCN

- - - ROTMION c -

094EL 2

] '

MG r  % .

sem ROTATION 0 9 EEL 3

. gg ma SPAN l

i RUTATION Op4EL 4 I 1. 2f YUL Tf., 25e M G 4e A stv. oo +e.e sPm

{ '

.ROTAT10H l L_ _IMIX 1 (5) i  ! On+ns  ;

M s 7 sem  !

~ ROTATIG4 u _a l l MIX 2 (6) f

' Quecs l!

i

/ 7 r--

l

[

--- J m -- -

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 l  % e Row e Ca el 1 OMeE1. 1 s _$  %&

rREe - ,'

l I sm -

l 4 ROTATICH -

OWeEI. 2 FRED -

SF%N -

l ROTATIDF -

C f onen s l F3lE3 .

srm f '

ROTATjCN -

De+EL 4 l 1.74 VOL f5 4 '

51 MG 46 P.

A v. oc .e.e sP5m Y '

l ROTATICH -

- HIX I (5) l acaens i*

S

- 90TRTION -

HIX 2 (6) g Opens C  !

__. saw l l POTRTICH -

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 -

g 1 i O@eE 2

~- FREQ spsw -

ROTETICH -

7 OD#El. 3 i

! L i --

N SPAN -

ROTRTION -

On4EI. 4 l l y a l_SLV. 8.83DO VLLli

+e,OEHL DEG 40 :c SF9f l M l l ROTATICh -

MIX 1 (5)

~

J

_ g 4r-~ '

I i -

O PEELS sp,w __._

, -- RGTATION -

- 3

_ MIX 2 (6) a  !

I owens Il t I N

smatw -

Figure 27 - 40% TW flaw at sleeve end

C ,

. CH 1YERT ,.

CH I HDEcIZ . ) Que(1 @ - 5 W e stok g 05aeE1.1

~

p f -f _ FRED SP5N -

Q ROTRTION -

, open 2

'h <

~

FitES N

) __ i' sm -

g J,

==>=-

OpeE 3

,FRES -

- SN -

ItCTRTION -

O p*EL 4

1. % VOL T f. 40 %

' stv. 90 +a. , 54 E G CA -

l } ItCTDTION -

_ mx: <s,

('

onens

sm 320TATICN
  • MIX 2 (6) y ouses m _

l ,

! j t. ROTETION -

Figure 28 - 400 TW flaw at sleeve end l__ 1,. Ch 1 Wrt .j, p. 3 gs j; ,j nc,m-$ pG e g3.

l

. l joO+E 1 s FitEG

' ~

SN ROTm:0N -

~

o CM*C 2 N #

30TATION -

j i OG+C. 3 r i ,FREQ -

4 1-sm amm::= -

l NE4 6.L5 vot.TL 74 EG G% ~

LstV. EO +* to SN i

~ k ROTRTIO4 -

R MIX 1 (5)

_ 1 e

_ oa.as L.-

s. -

f I '

_ IlmATION -

O' _

fflX 2 (6) g i  !  ! wsN -

! 1

!  ! ammIm -

Figure 29 -

shows " clean" sleeve end, 1

, o. .

.__ 2 m' ... > ; G . O'e c_ @ - apre ?

l r 7 ,ID e sta.

== -

C_~'l

om

.' I 4

I

}W-

201ATICes ll [

t t

I i '

Il g l 4 L"5

- 1 I con-1 I I g F"tEO -

-j l

\

g  ; sw -

. MWh l

l RIGA.51 oun-FRrr., -

6.54 vta. TS 56 MG 6% su -

RCTATION

}  ! ') ) pm j l t r i g aat - >

__ e or on.

' i L 2:4h

__I_ _.) .u-se i I_

L u,

k ! , .

? <

Figure 30 .

" Clean" non-tapered sleeve end

.>-- e...- : s.

i xnc s - -:n e  ::, e% +ca e

== >

a I

one -

'  ! i !IO. -

j KTG Ices

, .  ; g , ,

i '* *

- . i Le r

j t' T.

\

I w-1 O \m -

i .

e .44. -

i , RST;.T:Ca.

l.

.i .

I

' Ei E _ .

3

! I

  • l r .s
  • m x_o - n f:

t g

s.M RS "2 M 5 s4 3 e

MTATIM i I s

]

i

  • f

-- l2TI'P.'E*.

- ,ur - >

3 l i 3

j  ;-  % l e of 00+

g g 1: F:.

i I

l  !

w. = = . e.a. . I e

( ,I i i. L- r I-I f

s

! i t

Figure 31

" Clean" 1/4 inch long OD tapered sleeve end u .

..  :- 2 .p . ,  : .< _ . ., s. _, ,,3, ., ,

' , g. ,

7 i- . cw

b. !one i

$J %l l

SPQH -

RotaT!a l

l i L I i L l  !

l un_:

__ i

! on.e l 4 i nra -

,L w f I sm -

8 g j{ i

~

j emIm

i

) }a l

I #!G" !

1 On.e

i i ms -

il*5 i

I: av.rm

e. s va.is,

.e., e oco . - ..

sm - .

l Rcm!m.

I "

  • ' %. ~

1 i

.L. tg l I l in

_ne_s e of CW 1

i l l

  • l.

l I

! }  ! /

a

!'! i L? I h

l 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 ----

801AT10, f

8 I

i On+C. 2 ,

i i ma -

E }

(

\ g l m-I p 4 l tjy no urlm On+E. 3 l ., N --

q a SPSH ~

! ,RUTRTIDH I l

~ On+0. 4 l i I me 1

g j N34' W 4. O l sP5N l

ROTRTIDH j

i

, ,f, s ,

d MIX ! (5) 1 4 i oo+us 1

s I

~

sw l --

J ,

>RDTRTION MIX 2 (&)

(

, I. on+o.s sm

- i4 + ,- -

era,I, .

Figure 33

" Clean" 11/2 inch long OD tapered sleeve end l l

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