ML20005F119
| ML20005F119 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/05/1990 |
| From: | Bradham O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Hayes J NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9001120309 | |
| Download: ML20005F119 (38) | |
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l M . Gouth o^r: lina El;ctric & Gas Csmpany Ollie S. Bradhom . ! 7' " P.O. Box 88 - Vice Pr 6ident J;nkinsville, SC 29035 ' Nuctsar Op: rations i' (803) 345 4040 J -SCE&G l
~ January 5, 1990
, Document. Control' Desk- .
U. S. Nuclear Regulatory Commission-Washington, DC 20555: Attention: Mr. J.-J. Hayes, Jr.
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395
. Operating License No. NPF-12.
Additional Information-to Support the F* Technical Specification Extension Gentleme'n:: On December:18, 1989, South Carolina Electric and Gas Company (SCE&G) held-a telecon with NRC personnel-to discuss the Technical Specification Change Request to extend the application of the F* tube plugging criterion for the life of the steam generators. During the telecon, SCE&G volunteered to prov.ide several sample eddy current-lissajous figures which demonstrate acceptable and unacceptable:F* candidates. Attached please find a brief description of F* application at V. C. Summer Nuclear Station and sample eddy current lissajous figures for 12 steam generator tubes. This letter completes SCE&G's response to NRC questions on F* extension. Should you have any-additional questions, please-advise. Very truly yours,
- 0. S. Bradham ARR/OSB:dgw Attachment c:- D. A. Nauman/0. W. Dixon, Jr./T. C. Nichols, Jr.
E. C. Roberts R. V. Tanner H. G. Shealy S. D. Ebneter M. N. Browne
- J. J. Hayes, Jr. S. R. Hunt L General Managers A. M. Monroe C. A. Price R. E. Kelso R. B. Clary A. R. Rice I l- K. E. Nodland NSRC 00 l J. C. Snelson NPCF l R. L. Prevatte RTS (TSP 880027) fu;[
i , J. B. Knotts, Jr. File (813.20) .\ ,
!9001120309 900105
. iPDR ADOCK 05000395-t: { -
e nn u _.______._________u
- Attachment to Document l Control Desk Letter-January 5.-1990
- Page 1 of 2 F* Application at V. C. Summer Nuclear Station
.The F* criterion specifies certe.in conditions be met prior to application to
.insitu bobbin coil eddy current results. The specific criteria as defined by V..C. Summer Nuclear Station (VCSNS) Technical Specifications section, ,
4.4.5.4.a.10, for F* distance is: F* Distance is the distance into the tubesheet from the face of the tubesheet or the top of the last hardroll, whichever is lower (further into the tubesheet), that has been conservatively chosen to be 1.6 . inches. 1 I As defined by section <.4.5.4.a.11, for F* Tube: i l F* Tube is the tube with degradation equal to or greater than 40%,
'below the F* Distance and not degraded (i.e., no indications of cracking) within the F* distance.
.This criterion applies to steam generator tubes found to contain anomalies in
-the full mechanical rolled tubesheet region. The F* criterion has been applied during the two previous refueling out. ages at VCSNS.
The application of the F* criterion uses two independent teams of interpreters. Each team reviews acquired eddy current data to identify any anomalies within the tubes. All anomalies found in the tubesheet region are conservatively reported as 40% or greater through wall depth. The findings of_each team'are compared and any differences resolved. The resolved findings'are then reported to a person independent of the data interpretation who oversees the remainder of the process. The next sequence in application is to establish the hard roll contact point within the tubesheet for each tube, on an individual tube basis. This point is established by the Engineering Services department, using the.tubesheet roll profile for each tube found to contain an anomaly. After establishing a hard roll contact point, the F* distance is subtracted, and a comparison of the elevation of the location of the anomaly and the F* location for each tube is made. The determination whether to plug / repair the tube or leave the
- tube in service, is based on the outcome of this comparison.
The attached lissajous figures are random samples from the October, 1988, refueling outage. Sample Figure 1 is a tube with degradation at an elevation which leaves less than the 1.6 inches required for F* application, therefore this tube was eliminated as a candidate prior to establishing an F* location. Sample Figures 2-6 are tubes for which F* was applied. Sample Figures 7-12 are tubes which have reported degradation at elevations which initially
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e i* - - Attachment)to Document Control Desk Letter
" January 5, 1990.
, Page 2 of 2 e .. .
L qualify for F* disposition, but upon evaluation of the hard contact point, p failed F* application. The samples provided:show four figures-for each tube (with the exception of
. Figure 1~which does'not qualify for F* based.on the anomaly location =shown in Figures A and B). Figures A and B are from reported indications with normal bobbin coil analysis. In each lissajous figure one of two mix channels are
~
! displayed. The trace patterns noted in Figure A are standard two frequency -
-' mix channels for suppression of support plate /tubesheet interfaces. responses.
The trace patterns noted in Figure B are a four frequency suppression. ~ , technique. This technique minimizes the effects of support plate /tubesheet interfaces and inner diameter roll transition signals for evaluation of relevant-flaw information. . Figures C and D are the tubesheet profiles for each of the subject tubes. These profiles are generated from the bobbin coil response and provide'for assessment of the hard contact point on an individual tube basis. Figure C shows the-top 2 inches of the tubesheet region, the transition zone and
- several inches of nominal' unrolled tube above the tubesheet secondary face. ,
Figure D shows the entire' tubesheet region, the transition zone and several
, inches of nominal tube above.the tubesheet secondary face.
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.F* was applied to this tube.'
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This tuce'has=a smooth expansion region-although several .
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area! appears to be gradual from 19'.6' inches to the. top of'the {l. Cube sheet secondary' face. ^The hard contact < point ~was set . j.? : at 19.6: inches, F* location is therefore 18.0". The reported c; ' anomaly ~is;at 11.S*'.. - This tube was lef t in service 'via F*
- . applica tion.
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.The tube' sheet shown'in figure 4D indicates a gradual'trans ii t on' i near'the;topLot the' tube: sheet.- The expansions are consistent' 1
*. throughout the tube 1 sheet with minimal roll-deviation. The hard. i L ; contact pointblocation was' set at 18.~7", F* location therefore ;
~isL17.1".' ' Ths^ reported anomaly is located at 6.4". F* Was ':
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': Figure ; SD indicates an evsnly roll expanded tuber . with Ivery- 'i ilittle-deviation-throughout-the tube ~ sheet. ;The.hard contact ;
point vas' set at 20.8". This location is immediately below'the'
~
start of theLtransition to nominal tube and is'at a point. . .i
, consistent;with the rolls throughout-the remainder of the tubo -;
4 isheet. . The ' F* ' location 'is 19.2 ", with a reported anOnaly at;. -;
' ' '
- 19 .1 " '. This tube' remained in service'via F* application. l
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Figure 6 The tube sheet region in flyure 6D Andicates a gradual change in expansion towards the top of the tche sheet, prior to the area of transition to nominal tube. The hard contact' point was set back to 18.9", where more distinct roll expansions are visible and at a point consistent with the remaining expansions in the tube sheet, This provides for a F* location of 17.3". The . reported anomaly is at 16.9". therefore this tube was left in service via F* application. i. J g.
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. . v. a D ", Figute.7 i U - The tube sheet' region in; figure 7D-indicates several areas'of distorted-: rolls, and skipped roll regions. . This" tube was not assessed:for hard contact point: location although several, areas .:
between the' skip roll regions appear to have sufficient contact ~{
- I'.. '
to' qualify ior'the F*. criterion. 'This tube:was not^ considered i ); ' for F* application'.. The reported anomaly was at 6.3" and the'. 1 tube was removed;from service via plugging. - 9 4 i a h
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..As shown; in figure'- BC 'and BD this- tube was expanded slightly"
~
-above the-: secondary' face of the tube sheet (an over roll
~
l condition) .'. - Due to this roll irregularity, the tube was not :*
., ; considered'for^F* application. ., The reported anomaly in this~
Y tube ~1s'atL17.9 inches. This tube was removed from ^ service' via Plugging. y ' ' ' i
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_g' A s y e t !
.- - .- ,- 'y 'g 1 - a
'_jf '.t .[
.. . . i! 1 t
an.m - esmeAm - um..I ;P :J m one us.wi l !
""]
. . flfff e-*-vc :
M . gg. .e r 0
- 3 gg. . *
, 5 *e.m .
i GFF1 , EF9a E: 5
- f
. s i
GAS = - G6li Over Roii g p2 .. . . . .@. . . .. . .., [ a a a a. a. s. s
- n. .
e
. . . e A _- - v _-
f ! l Figute 8 C mm.m - ens.staa.m - um..I ;p an ense en.wi i i Y I essa i. w.
- ess.7.....:.. . .. < ... .
l I gq 3,3 . . . f. .... . .... . . .. .. .. ...... . ... EFFi W h . G6
- s
&h .
G6li
.. . TiB . . . .
T l
~ '
n, PNN B. B. E. 2. 3. 3. .5 o e e o + e e - e a -4 e r e e
~
. . EG.3%E.
. . E. ... :E*aee P.P e e o
. *PP P."PFe
-ee N.__
AA1 .l__nAslA
- -A _hnu_A. ,
1 Figure 8 D l l
., , ~.. . _ _ _ . . . . ._. __._. _. . . . _ _ _ _ _ _ _ _ _ _ .. -
,'t' t
- CH M 2 MTM- 04 7 Hlut2
- CN##EL 2 - MING S w nt p
< b ;
i a N-y - _ P and P l I 5.17 VER.T5 17 45
- - m + is. 5 I
L
........2.._
j Figure 9 A a CH M R VUff+ - CH 7 MRZ + CWedEL M - MING 5 i i I ' a 7,.
- a, w nd ws-s b ..
I I m 4 mes' p m 4.54 R TS
+ is.o 53 m 1W 5 l L i . . . . . . . . . . .
. e. . . . . .
__p .. .. . I l Figute 9 B s
f$: ,
, . , + '
t i p;.% . - n;
; ~; e i
.ic : , . i
;;r-f ,
q
- y. .
. = -
a: . - c. p-s ; s 4 y ( t
,. s ;
p~, g , + , e : g -
- -j e -
4 Figure'9 l
- The: tube [ sheet region in figure 9D exhibits an: area'at the' top- ]
n > of the; tube' sheet in which the tube does not appear ful1y. . i expanded.
- The^ hard contact. - point was determined ' to be at 18. 9"o '
i
- t. ist a point-indicative of the tube being fully expanded. . The "
' F* Llocation isl17. 3 ". The reported anomaly is located'at 18.0".
X. l This tube was removed from service. t 1 c. L}.
.{
i I l .)
.T.
?
~
r . I'm . ! -t 5 g::.- L s t { l
-l 4
1 ,. g ( 5,' ' w
.n i s
b t a F
.1 a-
. 'y,,'
- t. .b '- _ 6
.x7 y x- , <.
t p ,q , : J.- [; t
,J, ,+, , , , m -- .-a--, , - - . - - - - . . - , . - - -~ - - . - - - . . ~ - _ - - - _ - -
E ...- ,'I ~;o i l l ; 6 J 1 u se. s = ens.st a a m . G a .sj W 2 E Draer est.t.it j ]
'fnfW o/>lL-age. tat- .
.* a -
en- '\) N' :
// i l asii . : -
ani .
*= .
n - se I.- _ 1 46ti
, . . . ris. . . .
n I a I 89 . . e e a . e _ _ -_ A-- - A Sa F1gute 9 C c Mpt.!D = 668.%. !D = 675.9l @ +2%l D! set G M .Emel l w w- .
'W' .
seS g .. N ... .. . . . . . ... ...... GE.7 . sagi 8 91.2 - .
. d GW-67 %
~
l sW - 5 Es$ '; , l Esti
~
- g. TTS . . .
1 FS.-- I. E. E. E.......-.2v..-
..... ~..
I E E *i'i.. I 3 E. E 3. 5. E..
. ..E .E ? .. F ? ?. I.aw P ** ?. ?. ?. my . ~ P .!
a w_ n'- A
-.'m..t .1 . . A __ ._ , , _ . . ._ 1_ - _
-A U 1
Figure 9 D
- , . -~ - - - - - _ _ --_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ . _
y .e
)
- CH M 1 WUtT+ - CH ' 6 VEtri *' 0580GL MD - MIMD 3 1
+ ;
l m ........g....... .X - ... i
- 1.75 YtLT5 74 77 3 TEM + 17,9 m :.: .. . . . .
Figure 10 A The clarity obtained using a standard mix for this tube alleviated the nece'ssity to generate an additional lissajous figure using four frequency mix techniques.
fhkI5I54 , - y
'l I 'I 1 i;
a I
.A: l 3 -
.)
J g. " & i t l l e l i 4 7? IT -l Ybo 1 3 i t
?!
i i Figure 10 ; 4 . lI' IT$1sitube is expanded and evenly rolledIthroughout the tube , l
~ sheet ^ regioni however, the final three rolls' are not clearly '
fully ~ expanded _ consistent with the remainder of/the tube. ' : sheet' region.' The'hard contact point was set at-17.7",-at i
;-the; point where-the rolls begin^to indicate' fully expanded ;
. tube. I ' The F* : location is: 16.1"i the reported anomaly is at- ,
;17. 9 " . This tube'was' removed from service via plugging. 1 o
g_ i V .> -
}. L 3
Y' C , i ( > T S b e ! . j i l i e 9 i h h l J s 1 .y,..
.l . . I t
i I I (
.am.is - ess.apa,.in - m.at gs -Jgt:: one m.wi l .
fwc ifW/W ses a-m d ' w; )5%. /. / ./ ,
- i. i m, ,
sm as ! ses I . see; . . I asti ; 1 A A A l j a 1 . . n a. a. a
. =. s t
n . . . i. . . .
- ___ /& __ _ A z
b Figure 10 C
- - us. p so - m ..I g= :J g : orm m.=i I .-
essi ~: en ' g. N . 2... . ... . . .. .. . . . . . .. . .
.: .,n,.... . . . . . . . . . . . . . ... . . . . . . ........
, ,, . . . s. . .
m. i N. t u+
- i ssi
. - Ji s 5 q S' i
l ~ m z u. s. s s s s ;;; 2. s, . z, z s. .s = = s e. .r .* re r, .-. r. e. r. r. M.' ........
. A _
.A
- uiA2 _A _A _ A A A A_A_A
_ . _ _ _- _ ,_ A__ __ m_ I b l Figure 10 D
i o- ;
+ C. ,
o
-.o ;
1 i . 1
- CH M t VUtT+4 CH 6 VUtf +{ CM NO-MIM9 l j
%i '
l_ b I a I- , {l
-t l
... .. . .......i'..... *
~
49 m T.44 VM.T5 . 153 - r_-_ i
............r- ... . ;
Fiqure 11 A ' i
- CH M i vut19- CH 6 VUti , OsseEL HD - MIM 4 LI
+ i l- 1 ^
3 s :
- t
- i
. ., .....i...
d.17 vt1LTS 47 3 67 5 m + te.e il ' l ' t I
; . . . . . . . . .l . . . gf . .
1
; , . . - J . ..p . . . w - . .
, .. ..s. ..
. t I
i
! - I Figure il B s t
-~
u, m el :;u - + - - m- - v-- v#
",t" i fF
'?
.hf d " ' 'h. u2 (:f DJO ' . YT[( s b:
4 ];.; 3
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a!.h y >p.C
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r ,
-p,,... e; > > ,
a a',0 ,, .g 4g, g s , m,.
;t' s , ,
3
# 1 3,
r [A A , ejy i n; ,. . g;w:n n: k i 3^ . ' t
- r p
F; ' ,3.i 4^ . 5,- 7
'E.'
+ '
4 (
. h, '-'
. - ii'.' ' '
t
, rt: .
" -f .=j
/6 , - ,_
's t g ~= Q f -
ylt 3 : _y
, 1.
. , ' :: r
( J:. 3'
? - - s :.. . . f e
,. ?
,i 4j ,p "- -
A w
'?
+
n.i e *K n h*. ,JJf . ' r Ql1 ':v-- w kyh k[ , t m. Aa ~1 n {l. -ggy - .. n q. 7% - . _Z ,[ f % _.3, - I 4' f
.8_5
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I 'a
.[5 ~ '*
(T G: +. Figute ilJ K a e :. - t ' '% K' 4 iFiNure!11DIls; indicative of:an even1y rol1ed, ful1y expanded i The/hardicontact' point lvas determined:to-beIat: 2 0 .' 3 "
% tube.
W,) ] corresponding;to<the bottom of the'transitionifrom rolled . tubeItovnomin'al tube.- The-F*' location-is 18.'7".= ;The; reported ' g~ -
- ano'maly, is [a t i 18. B " .
; removed'from service..
This tube failed F* application'and was;
. 1 - 9: .' '.i }
'4 , ;,
,e ,
1 - t . .
- a. '[ 2
=- q' ;. " '*y
( - 4! 4
.9:
, C h'. W A' t -
> 4
'-.4
. h.
7.
- m 4 $ /
h khl;E! > ?
}t1 3 7c * , 3 .
k y- +* y
' D: a < r' r k2p . G l-l( . s I
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'. A C' p . -
;h .6
.- 2,g.-
.y< y F. # 1 < f* 7 :b M ?
-{-:%
i T. ;
'Y ~.j U. .u y , t 6->
p, >
'y Mji. %W i, ..
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. h - % . T Ni WlW -{in.. l4. l .j.
t m V -. q4-vi ? t+ . .,r sm.. un, 2 + w . . _n -
, ,. ,, - . . , - -, , + , -
? p ': !
1 i .f i 4 >
'l I
. 1 l '.; )
o
-i ..to = ud.:ca..so m.sl- W :,f:EO ot* m 2=o i
; .we :
l I
,6p ~.
g ]
- !W .
l." y j
- j1
. uti.
+ '
Gn- , 673i ; s s 6st j : i 'h 1: 605:-. . i t , uti k '; i t [M h a k v b b h w h. k e l
, - (,^'
l~ [. 4 i: ;. , l 1 e a l< Figure il C - l Mon. !D = ud.2 ca.. to = sas.6j QS afjp otset u s.le d swg e w -t o - sy ~m
/O-2,0--93 l
,Q >
I I.mi 3 h .3
^
-f w,1
. YAM
- o. '
i . I l A sn. - i I-( , , .
.. ;- \
,,673- i r
1 s
!, *,32 x
-l uia i
i 2 RI 5 3 3 3 E E ( G I I 3 5 ~. E *5 P ? ? ? ? ? .* ? ? F ~ P P l w i a : a :. s a . 5.. a : 3_:_ s a ~ a u - - - - - - - - - - = ~ - i f Figure 11 D i G ws , - , - e
o- . ,,, i. F l , q i
.' , t
- CH M 1 W + - Of 6 VUti + CMDGEL ND - RING 3 lik l' r-- 1I t:.
- % I
- h> .
- e>
.. ....W mmm.... .. ................
T.38 VELT5 38 73 5 794 + -11,1 i l:
,f .... . . . . . . .....
l
,.....f,..........
(l ., ...... ..,.... . . . . . . . . . . . . 4 _ Figure 12 A
- 04 M 1 VERT + - CH 6 MT + CH30EL M3 - MING 4
' j tii r---- !
1.35 YULTS 34 3 65 g TD4 + 11.1 l i i , 1' I i Figure 12 B 3 L
p'e
~--
. r^gf ,
4 - , Ds .
- w' .,
i p s k 9 Figure 12. The lower portion of this tube was evenly rolled; however the region near the top of the tube sheet contains rolls which are indicative of skip rolls The tube near'the-transition area does not~ appear to be fully expanded in either the i
' diametrical or axial directions. The irregularities in this tube lead to_its' disqualification as a F* candidate. This
. tube was removed from service due to a reported anomaly at 11.1" from the tube end.
't t
i t r h"' sk
o ---
,... t P
u en.m = us.stan m - sm.ej p -gy; oss m.emi j i i
~v
# iofd/N Wwo . to _%~d .
g Y O . gag. $ . EFF,
'. I
;g i ,
i -e.47 W N: +e.se p W u . 5 M e 668i , ggy: . . .
.Ths, , , , .
m E E E
- 3 3 e n *
. e i . 4 nn g _--
- '_ _ n -- m Figure 12 C ,
- us.apa.m - m..l 7 :m= m: orm m .a i I '
=
, wV
- l l i W :
M : i 4 sea; . . . . . .. . . . . . l 4 .....:. . . . .. .. . . . ... .. . .. ..... N f l N , l \: L_--- 1 *: l-
=: ?$ k i p Rot I s
- l. Est-657 ds : L 1 - ---.--.--- -..s .......- o N
E. e:-. .. P r r.* b*e L .,*. 6 4 6:.*=*= 4*e L i n E
. .*. ..* * *
- 18 .* ?!"=
-,a9.-
e . p _h__ . - m Am
- r A 2,2- m 1 .A. __ A. ._, /l. -l A_ A a 2 __A m .. - ,f' y i!
- l. a Figure 12 D 1
l l
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