ML19289F441

Responds to IE Bulletin 79-04,Incorrect Weights for Swing Check Valves Mfg by Velan Engineering Corp. One Piping Sys in Seismic Category I Is Affected

ML19289F441
Person / Time
Site:	Cooper
Issue date:	05/01/1979
From:	Pilant J NEBRASKA PUBLIC POWER DISTRICT
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
NUDOCS 7906070373
Download: ML19289F441 (6)

Text

.

k

- [g Q GENER AL OFFICE 4 P. o. box 499, COLUMBUS NE B R ASKA 686 4:

L :: f Nebraska Pubh.c Power D. is trict TcLeesoNei.o2>se.8sei bby 1, 1979 Mr. Karl V. Seyfrit, Director -

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Suite 1000 Arlington, Texas 76011

Subject:

Response to IE Bulletin 79-04 Incorrect Weights for Swing Check Valves Manufactured by Velan Engineering Corporation

Dear Mr. Seyf rit:

In response to IE Bulletin 79-04 " Incorrect Weights for Swing Check Valves Fbnufactured by Velan Engineering Corporation" the following information is provided for your review. Only one piping system in Seismic Category Class I (RHR Service Water Booster Pumps, Injection Water System, ISO 2852-62) is affected by the possible weight discrepancies involving the subject check valves.

Action Item #1 List all Seismic Category I piping systems (or portions thereof) where 3, 4, or 6 inch diameter Velan swing check valves are installed or are scheduled to be installed.

Response

RHR Service Water Booster Pumps, Injection Water System, ISO 2852-62 (Partial).

Action Item #2 Verify for all those systems identified in item 1 above that correct check valve weights were used in the piping analysis. Explain how and whenthecorrectvalveweightsweredetermin6S3 Response: Igoso20 2231 .42 Load calculations for this ISO are not in our files. We generated new calculations following B6R's procedure for similar existing piping systems using the correct weights for Velan swing check valves listed in IE Bulletin No. 79-04.

, Mr. Karl V. Seyfrit May 1, 1979 Page 2 Basic load summaries were performed using the weights of all components of the piping system (pipes, insulation, fluid carried, flanges, fittings, valves, etc.) and then determining what proportion of the load would be carried by each hanger in the system. This is normally accomplished by distributing one-half of each line segment's weight to each hanger supporting that segment. In the attached calculations, concentrated loads were applied to the hangers in such a way that the total load to the hangers is actually greater than the load to be supported.

The minimum safety factor used was determined originally when the allowable load (Column C) for each hanger was calculated by the original designer. The allowable load (Column C) was less than the actual capacity by a factor which is equal to the minimum safety factor. The actual hanger load (Column E), as revised and as shown, still being less than the allowable load (Colunn C), maintains the minimum safety factor. (See Response, Item 4.)

Action Iten #3' If incorrect valve weights were used, explain what actions have been taken or are planned to re-evaluate the piping systems affected.

Response

New calculations were generated using correct swing check valve weights.

(See Attachment "A").

Action Item #4 Specify for all the af fected systems identified in Item 1 whether modifications were or are required to the piping systems or their supports because of changes in valve weighc. Also, include the basis for this determination. For those systems in which the actual valve weight is greater than the design weight, provide a summary of stresses and loads and their allowable limits for the piping and its supports.

Response

No modifications are required for the piping system and for the involved pipe hangers listed:

Column C Hanger Allowable Load Column A Column B (including original Haneer No. Actual Hanger Load safety factor)

H294 257# 1130#

H295 272# 3130#

H259 774# 4384#

H278 774# 4384#

2231 343

' Mr. Karl V. Seyfrit May 1, 1979 Page 3 Action Item #5 Identify the analytical technique including identification of any computer codes used to determine the stresses indicated in Item 4.

Response

Manual calculations similar to the method B&R used on piping systems of this type at CNS. -

If you should have any questions or comments, please do not hesitate to contact me.

Sincerely, Y Y >l!'*N~

Jay M. Pilant Director of Licensing and Quality Assurance

• • 344 2231

t ac ment DESIGN ?ALCULATIONS SIEET I

UPPD Sheet I of d Job No. t- tor h \ op., Prepared by Y h a+ - M Date Q.-n.

Subjeet \da o Ch( 66,, Checked by [ 8# ff s p.5 Date #'ll-w sh veoco u ee w eQk.\ 3 M h 'k.w o un.voes wbkh w b <u, c i rs> c o r e - w w e'ghA5 uSv o N h oc 3 ~ A w g ,<w c c.t c M ,o,o 3 c. , c w qp o rw w w,, s ,, s( e 4 zc% 3 %t% 3 'A u s e < , b w u g ,

k o r- N d cc(,c ded " ora s Q t c G o't ~ k k h'?'D ^ " ' ' ~ #

'h'*

4- u Q 9!,og \c d s t h,4c- Lt, -EL br ks oq 'c '- *J 6 q r1-

%:s tu-n gs'd wA dw h 6,_gu h2r %d-

% L As (Au M s;N.'s exq,r\A W \s'hrs sb r=.h

\. t;.hs.b oca %-

G N 4 b cL \h<-co3r W eev,s, ~_ c W e .~ L< \

i t. , m ( . :2 4. o o 4.w, -1s e_s..._,s n a cAc 9- o r) 94 w " ' a <-.

rc C

l u-->-

u , , s_ .s. .c

. A le A a 3e c b "' 3 r "* M Utd'Q

. ,s .~c-g Qom ts SQ C 8L uw r.>. ora 2 c.a : =,3 5 3 - G S cru 3 he3 N Zb Td-(> & reu 7

% - \o d Is n.4 h% h C-D's g . . wb'. V

u. gk, s %%4(

\. c oo - \ 5 " A 9' "\" -\ d 4 k b" : \\ [ \ \ ,\(

-u_

l' O C. q , O kk. \\ k k h T \

v~ m a a n .~m .a sqpa w s_ ,, , gm DN (o t- to r; n R() p.g.. 2e N C- Q \- 5 0*# y 3 bn b (vs's \ r-ra a

s lo c 'k - r\ g * ( = z,'g f **

w e m se,g um, ,c e

s..

7 q w c ;Sm 3 9 a c ,,,,,,,q g ,,3, ,.

u,t. A yc~ v- ~ c_ \; c m v.x y. mt gq p

A ,w '

m a A 2231 3 45 i

i D W D P R l 1 Dq[AJ\

V ol _b]kym

}f a

DESIGN CALCULATIONS SIEET i

NPPD Sheet 7 of 1 Job No. N Q h'ToS Prepared by T N% r ~ ,3 Date 4-21 Subject b.k,v t w 1 DnLs3es Checked by 2, f 8-psygg 5 Date 9'-7/-

w.h afume r.b h gkb3

% n~ v W Es $ (skoto sv ossa no tsCE - l,5 tio s (test- GG nn) ws w p ss b. E e 99 a. u."g. ,

b vu { $ " 4 ( '\" 4 o' (,"+ 5 ' 1 h" . \'2,' \'('-\2S7.,

lo rA = \'2, \ L M\b:\%4 ~

w%_(Unwa wQk - h:W5 Le A - xs s e s = z ,t.s *

% b,.ogc is e<;"gg<vtoo Gr:rse,A\ % ~3r '-v bbk k<w w &Qa t Wg o g- s\30%

1

. s q ss A.

C

%~gs w zss ( wzw (sto_~ e ,u 1se zese - or c~ i) b k1 suweras c q u~v w ~b n ~

tw%rgm w~3cs su

-Ste uds~ppcx . Im sp

%b U na's w rt_. mssy Q ua:mS. c t.<ub w m,s ec u,4l csu(* ~ o. Losk h.-so~ s> Awbuo Lcoqtw v toh g ,_ m g , .. t,, g,_. ,

s p w ~3c w ,u w. o qqb < o To w.

twawkAQ%(unk h k k <- .,e bwb tomb n<ek % w b b %

kt*-N*.vekh \ h %,k k,,3Scg, f s"eg p-%w mg u suv c (3,t ; g gn = W e

~ 4 e \ @ c =- n x uo = t vt* 1,,

e c a q" 4 0' e x nW ' ' ,;,, ", ' ,. '3 ,% ='

-s , esp u

.m u wh e@s 5 0-; = = \o.\tx\\ = \t L ~

4"bc6s -two C@'55% *

%=. z x i s s = ss o 2231 346

,l' b n Lte s - ru.~ ,_., 9 ?z % ,

w&_ gy1E= b99~_

ss o" a u et ~, a(SS se e.w%

we i

_ ve., v .c_. =. N % t, ~

D* D "D ~T o o l\ o _A."a

Attachmen DESIGN CALCULATIONS SIEET i

NPPD Sheet 1 of [

Job No. Eu Q_ "\ o h Prepared by Y % a e_~ n ts) Date 4-zi Subject () A n.,a t%ck hd.,,3 Checked by 2. M 85###.# Date 4'-2/-

%.hw ' ~ e tr .e udf& s {/8 Y L. Yo h l L.s h t h k\?.7 % 3\O k b N A \S b 1

\I %

%~ m % Le7 _ 5p = me .

w ecooass-p~.,y ts e s9;pcs-om:~xp wa cvh w<shc 3 v 4cev ss vAkh h t\ Nw s --T w ^d* L c ws .

N K h% w n_% 's s q 6 h-i L ahe h ob i

I

__a;s g-c -n-, g 2231 347 i

J03 31 -

i C

.i