ML20126D980
| ML20126D980 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Waterford |
| Issue date: | 04/27/1984 |
| From: | Hou S NRC |
| To: | Paranich M NRC |
| Shared Package | |
| ML20125A430 | List:
|
| References | |
| FOIA-84-426, FOIA-84-449, FOIA-84-A-55, FOIA-84-A-65 840427-3, NUDOCS 8506150260 | |
| Download: ML20126D980 (5) | |
Text
..
i
..-r hD Draft 1 4/27/84 tski O
MDt0RANDUM FOR: Mark Paranich, Chief, NRC Inquiry Team FROM:
Show-nien Hou, Civil / Structure and Piping / Mechanical Team EVALUATION OF EBASCO ANALYSIS OF T-B UNDERSIZED WELDS
SUBJECT:
,j
~
We have completed evaluation of th report which consists of EBASCO analysis of undersizeV Q
welds in T-B piping using finite element approach. Our evaluation report i a
gg Based on our mfeting an conferencehlwithEBASCOengineer,weweretold that all welds under the size pennitted by ASME Code case
.6 were rewelded.
Thus, the s' ole purpose of the report is to demonstrate capa ility of well
.l undersized welds (below CC-316) can still meet the code stress limits and without impairing piping structure integrity under bound @ loads and load combinations.
.w 4
Shou-nien Hou Attachment
')
j cc:
L. Shao ija L'l.
,a
'.)
8506150260 850301 PDR FOIA GARDE 04-A-55 PDR
.,,..,,. r.. -,
s
^
~
t
Subject:
Review of finite element analysis of undersize socket welds.
Reference:
Finite Element, Analysis of Undersize Services Incorporated -
-ProjectWater7ord83,}
G16Ksdhs ~
A finite eleih[ent analysis was made by 'as determined by the ASCO Services Inc., of
==
Introduction:==
theundersize* schedule 80socketweldd ASME Section III Code weld requirements. The purpose of the analysis was to determine it these undersize welds would satisfy the ASME Code Section III, Class 2 stress requirements using conservative loading conditions.
==
Conclusion:==
FRom a review of the analysis and in conversations with the responsible engineers, it was determined that the analysis methods used were satisfactory and the loadings used were Igg' conservative. The stresses for all the cases analyzed usin the second set of weld sizes, were within the permissab stress limits for Section III, Class 2 piping. The lysis was performed for 1/2", 3/4",
1", 1 1/2" and 2" 80 piping only.
It was not intended that the results of t is analysis be extrapulated to other schedule pipes.
Discussion:
The NASREAN computer program was used for the analysis. The model included the weld and a given length of the associated pipe and fitting on either side of the weld.
9 Pressure bending and axial loads were applied to the model.
1 Due to the large number of load cases a base analysis was done for a specified set of loads.
In determining the stresses for j
the actual load cases, the stresses from the specified loads
.I were multiplied by the ratios of the actual loads to the j
specified loads. The load cases used in the finite element analysis were based on the conditions from the piping
]
analysis that caused the highest stresses in the given size pipe. The maximum loads and moments from these conditions for d
thermal, pressure, mechanical and seismic conditions were added
'I together to form. the finite added t;;;th;r to f - the *!!:
j element loading conditions. The combined loads and moments
?
used did not necessarily occur at the same time or at the same location.
.)L Principal stresses and stress intensities were calculated from the results of the finite element program. These stresses were i
then put into the various code classifications and compared to i
the code allowables.
S G
g.,.-
g,--,--
r --- -
4
1 h '
e f
9 g
g
~
I s
-t.-
r,
,.l-ist.
e.
a
- 3.- [
s*
- \\% \\
%y w.
s s
s f
AJ a
\\
'...j 6 g,,,
.u.
t s
~
( t s. ;.:....%.a
& P,. ', '.% V * ',., :u. r. ll
~~
.\\
\\
1 T-B )
.. n 1 ; e.-s. n s - :
e..-..
..j....,:
- s ue.
, s 1 s --
. :.t. o f
.t
~
i i
ei
/
8 1
)
g
,q ;,. r,
- t C.-. 8,.Cv' 6s i(.c O. t.. J '_ (, f u AL4 mT t.e h.v (.,
J -:..,
s.
es.r-l l
1 t
,'O A s......-- p l
- p.,.. c.,g,,.s 1.', e r J (, J C (', e J
( - I.,
p. ; i.-
s '. s. -.
o r
r s
3' 5
e.
t\\
. i i,
c-w
==
y
.g f,v(
.{ e,4 c.,
- % ( % A t *J... t, t,, _.
,1.e.-. *. -(.. ; ;(
- *,, (. * % g gt, p '.+. a A e.
}
i r
i i.,, C ('
f s, [, t.y t t.,9 C .9
.:, /r Cc.s i t.. t i t s
i;t t < l n'
.' 1. vt i d t.A -.
'\\
I.
c(d,"(b."{;
y r
a A..
Oct1 '.
t,. ci e w U. i st i 4 *. i,.
l
't s.P, twe s.
4,
/,,.,b
- I.s'#. t (
@g (,d 4,% f.
(
N * %'. *
.-a, e g '.f g
g g, $
g
.L f-
.\\
8
,"'4 a
t
.:. a s
.e k..
d tt.
-1.V(.se t 4 ;,. * '
.{
7-%,;
- v. i. - - (C r/,,
d
~~ ' e'.
j,1 t, * *7 \\ g a
p s
f '.. t ( 1 *.', t.-
Of.
.)
/ *#, 4 f'.. 7*
( C,
- h (t s s. s f\\*'
,4 '
E=, * *. - '
~
c f..r
,a,,
s l
{ (.
t,
.;(
$ (. t t ' 4
- t..
C c 4-k m. ry( s. e-e A
q. h \\.
fJ t '
i_ ;s i * * * '.
~
tt i.(
j w
e e,
i L,ee..p r
e
.T e....; s.... -..
p - si t%
v s. c{, 2.,- r ;.1 d
(
+,
t 6
i
'4 Ea.
s o ('
i fy
.n, n..,.-..
s
~ -
p.
?
..7 C., s.
t
- ' M{N -
e Y
e
......74..,..,g.....,g
. 9 j-
.y
,y.,..,
.....g.
~
d
heaisw of I.eeb e I n
'I ap' V ;i.
~
Gub
- u cf un de r-sh.e s ack.e y
aMe s
}
y er f bc!
f Ou '.
'. e Re b n;b E!
yco,^f"1,*Il6e it tttrsc 24h.sc.e,
UJo (d_,
/M i
O ff Qice
~
fd JG
- 1 I /t.
'Q-O * '*I S 0 AO G
i
)h.E s.sco C, vi c g-s & 3i $ l!.s'0 $ /711k e
$/' s o c_. s.f 4 1
a c c l'a l h ' b to Cccke S-
- jec/.?e < s c o e x e d ' y / / e.
ASat =
\\
w e, s
- a..c.
j S t, cla Z F co [ c. fa e /d y v,
m d~
l Ti<
/Ju rpos e.
h e a n h us wa:.e aja lc.s
,o
,4 a s e--
u W cle r s
<{s d</r <it akc u Asae der woo sa s
y v s/r ess $'hc. ~
Sae da /T C Ydss u s i y Cce s e < va}i w o u i r o s. p.
l
/sa<
GeAF x.:s ces c/u u sb. fron1 c< te vieu.) o/lde ayal s y a < /i n '
, y'd a_y / 097 y :
co n u e r sq.]k? on s w t sje tir or ec/ %,c, q je.-
i {-
a m -.
es~I "to o re-o e <.s 1
e$noa{y1<s 1
sad.s,fu 4 <~;
s w
me s
i s.nv!vfde
/o a i nYsI. o.s e a w e - a--Eu u'f s 1'r e s.s e -
% e.s w va./iliQ.4,eL-ed Con i
p., f w e /d sp]dsh a?a ria di n=us.'
ca ges J
3e d 6
"'l Mih
%'5e
}
/<miXs G,-
i s si ci 4 /v c
c.s n
s
<O class A-h,e % n [.22L 1
<p,n eaa%y.fw T,yc
, s e s 9' ' s f,s d g "
e t.
a ss E.c:cd 70
/
"a
,. <JC// )/
)
Y a rs b s y }e dz_,.
h as is ne A
og
?
<y A.. s' $ of ok]s seds,op,
/e Jo 1
a
_ _.,_, _......,,._...__..m._...,._...
)
'e'
- ~
'~
/
1 re w '
Y ' ) #, V$$'5 ? $
l L f
/
- h* i Q
a ni /h.v$$ O V.4 *$l Q;O/
g wa
- d.
E uMGM a rd.~~h 7-h stx ob f us e/.sclu n / h. e-q G.
a s sp c q h p.h,e a3,,d of & ay, y
- ein s k.
aiuen e
i a
yi.
c ; be:vetab.
o n ?c : d,l l c a 1'hl u
/Af5
- 1. e., aa
.]
9f)t el0
'de A q-i 4s e%n ue i e ee a-s 3 a.ec cxse c h a Fy,< s..
,1 u,x pya a._le'i 1
of tys p was },y.v/g v,cp-c'i a,u,
/
s l. r -
i
.~
s u,
e G c f va. (
A d Gas os s
r ess eg s/r oss/y'fraw/,/n,.e. hje yn< (ca actf a
'b
/e ad.4 u pp/y c fy J
c/
1 wy e.
a a wc./
TA
/sa u s o d's,pa;fke. for: /e_
oaxs w
w
~r l
oma4/ cans. ct ut o L m
44.3<2ct.
t a ?oe/;Jiousc/ os w %e s.L.4ca'vSfdy%pr$Nn 4
Leom
-sl'-
'c m $ sis 1
de si.
/Ja.
sm,y,j e. 7,1 a.
- I siun c
^
e a n m aa lo a. d.s a n d in sik'e x Sk from 4as co s de fio n.s fo <
.M u w a. /
in a.u u / s e
ciAM9tatere-di ec han c eL
,4.
0
/a om e c is
& fide %, =
asen;Lfo tc,Jo Ja d 61 v
im a.
f
,dja pe c,A,i.4 3
e t u s < d dili h e/ o P y: e c "sf>
l.;
e,r d nn o r>' e ><-
e,a
/A b & s a m e.
?
o c. c u r a/ o%
i so m e Penavpfc il.
e basa <&aik a>< < y, ca ic u,2a 4sw a a, g &, as am n
+i
. p -. v, r,0 a
/
- a. tA u (~ td 05 s-S r e_S S e J Go/.uerL.k y'S a.1.S /f i
e.
4 ca / 's G-l/o r/00h, a<d conpm J co
..-..,...6,..
... g. 7.,,,.~r y
,w, # y..e.,;...7,,.
.%.