STRESS ANALYSIS OF THE LOFT CORE

8/19/2019 STRESS ANALYSIS OF THE LOFT CORE

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c

C

LOFT TECHNICAL RE

MASTER

RE C REPORT NUMBE

JULY

7 , 1978

STRESS ANALYSIS OF THE LOFT CORE

BARREL FOR LOCA

SSE

LOADS

R.

K

Blandford

n

Idaho.

I r .


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DISCLAIMER

This report was prepared as an account of work sponsored

agency of the United States Government. Neither the United

Government nor any agency Thereof nor any of their empl

makes any warranty express or implied or assumes any

liability or responsibility for the accuracy completenes

usefulness of any information apparatus product or p

disclosed or represents that its use would not infringe pr

owned rights. Reference herein to any specific commercial pr

process or service by trade name trademark manufactu

otherwise does not necessarily constitute or imply i ts endors

recommendation or favoring by the United States Government

agency thereof. The views and opinions of authors expressed

do not necessarily state or reflect those of the United

Government or any agency thereof.


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DISCLAIMER

Portions of this document may be illegib

electronic image products Images are prod

from the best available original document


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.

.

,> t

1

FORM EGBG-1916

(Rev. 6-77)

.

.

LOFT TECHNICAL REP

RE C Report

RE

~ O R T I O N S F THIS REPORT

R

has

reprodccad

rom the be

copy 0 pa drt\he broadest p?~

. .

RESEARCH ENGINEERING AND CONSTRU CTlO

.

ENGINEERINGANALYSIS DIVISION

APPLIED

MECHANICS

BRANCH

.

,

. .

.BARREL FOR LOCA + SSE LOABS

AUTHOR

Pre

sPonsored by the Unite

United States nor the

E n e r ~ ,

or

any

of th

contlacton, subeontra

6 ). WarranW- expreu

lkbilit). 01 msP0nsibili

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inf

P w u k l o r cd . 01 re

in fr inge pr ivate ly o m d

C H E C K E D B Y : . G

Rahl/

R A p P R O V E ~ ~ ~ A Moore/

H


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LOFT TECHNIC L REPORT

LOFT PROGR M

FO RMEG G-228

(Rev. 12-76)

AUTHO R

G W

NO

1 1 L E STRESS ANALYSIS OF THE LOFT.

CORE

BARREL FOR LOCA

+ SSE

LOADS

ABSTRACT

The r e s u l t s o f a dynam ic a n a l y s i s o f t h e LOFT ~ e a c t o r o re B

f a u l t e d c o n d i t io n s a r e .p re se nte d i n t h i s r e p o r t .

Load i ng cond i t i

e r ed were se ismic ac ce l era t lon s re s u l t i n g f rom a s af e Shutdown E

and p r e s s ur e l o a d in g s f r om b o t h a h o t l e g a nd a c o l d l e g i o s s - o f- c

;

.. dent (LOCA) break. Maximum s t ress es i n the core ba r r e l re s u l t i n

R E P O R T

LTR

condi i o .ns ar e presented w i th compar isons t o Code a1 1owab1.e~.

s t r e s s e s were f o un d t o b e w i t h i n a l lo wa ble s f o r t h e f a i l e d

d e fi ne d i n t h e

ASME

code (197 i. ), ~ p p e n d i F .

. .:


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L

.

CONTENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

BSTRACT.

11. ANALYSIS TECHNIQUE

. . . . . . . . . . . . . . . . . . . . . . .

1.

D e r i v a t i o n o f L oa d s. . . . . . . . . . . . . . . . . . . .

2. ASME Code A n a ly s is

. . . . . . . . . . . . . . . . . . .

1I I .RESULTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

.

1V.REFERENCES

. . . . . . . . . . . . . . . . . . . . . . . . . .

APPENDIX A - ASME Code Analysis

. . . . . .

APPENDIX B

- SAP

Computer Code L is t ing

. . . . . . . . . . . . . . . . .

TABLES

I STRESSSUMMARY . . . . . .

, . . . . . . . . . . . . . . .

.

.

.

FIGURES

. . .

. . . . . . . . . . . . . . . . .

.

Core Ba rr el Se ct io n 204059

. . . . . . . . . . . . . . . . . .

.

SAP Cold Leg Break Model

3. .

SAP fiot Leg Break Model . . . . . . . . . . . . . . . . . . . .

4. Core ~ a r r e l

SE

S t resses

. . . . . . . . . . . . . . . . . . . .


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STRESS ANALYSIS OF THE LOFT CORE

BARREL FOR LOCA

+

SSE LOADS

I INTRODUCTION

It i s t h e pu rp ose o f t h i s a n a l y s i s t o d e te rm in e i f the LOFT re

bar re l can meet ASME code ] r equ ir emen ts f o r fau l t ed cond i t i o ns wh

to a comb ina t i on

o f

L os s-o f-C oo l a n t ~ c c i d k n t LO C A )and Safe Shutdo

quake (SSE) loads.

A

t y p i c a l c or e b a r r e l s e c t i o n i s shown i n F i g u r

t i o n 2A, t h e up pe r f l an g e , was an al yz ed f o r t h e f a u l t e d c o n d i t i o n s

ence 2 and i s . n o t i n c lu d e d i n t h i s a n a ly s is .

I ANALYSIS TECHNIQUE

1

D e r i v a t i o n o f Loads

Two computer codes were used t o determ ine t he 1 ne ar e l a s t i c s

the core ba r r e l : r e su l t in g f rom a LOCA. The

WHAM

computer coder

3

w

determine th e pressure t r a n s i e n ts which occur du r i ng a LOCA blowdow

, t r a n s i e n t s a r e fu n c t i o n s o f t i m e and r e p r e s e n t t h e f o r c i n g f u n c t i o n

.

e xc i t e th e core ba r re l dur ing a LOCA. The WHAM po r t i o n o f t he LOCA

was per for m ed by :V T. Ber ta us in g th e

WHAM

hyd r au l i c model o f t he

mary co o la n t sys tem de sc r ib ed n d e ta i l i n L T R

20-414 .

WHAM i n p u

o f a wave .fo r m des c r i b ing the manner i n wh ich the p r essu r e a t t he . L

p o i n t de cre as es f r om t h e i n i t i a l s y st em p r es s u re t o s a t u r a t i o n p r es

LOCA was d e fi n e d i n Referen ce

5

as a d o u bl e ended o f f s e t s h ea r o c c u

15 msec to ta l t ime ( 5 msec p ipe break t ime

+ .lo

msec f o r . t h e o f f s e


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LT

SAP q ua dr il at e ra l p l a t e and she1 1 elements. Two models were used t

sent the ho t and co ld l e g LOCA breaks. As shown i n Figur e 2 for th

the co l d le g break, loading i s symmetrical about the p lane which co

core bar re l cen ter1i and is . perpendicu l a r t o the core ba rr e l nozz

cen te r l i ne .

The ho t l e g break model i s symmetr ica l t o a p lane thro

nozzles axes (Figur e 3). These s tr u c tu r a l

models are the same as t

f o r the LOCE ana lys is o f the core bar re l and are descr ibed i n de ta

1115-35[71. A 1 s t i n g o f t he SAP computer code can be found f n App

Safe Shutdown Earthquake loads were obtained from work done by

son i n Reference 8.

A summary o f SSE stresses on the core b ar re l i

F igure

4.

These stresses were considered negl g ib l e i n t h i s a na ly s

2. ASME Code Analys is

Using the st resses obta ined f rom the SAP st ru ct u ra l models, a

e l a s t i c ana lys is was performed on th e LOFT care b ar re l p er Appendix

Sect ion

I11

of the

ASME

codeL1'.

A

summary o f maximum stre ss es ver

ab les i s shown i n Table I Appendix A conta ins de ta i l s o f the Code

Computer program ou tpu t i s being re ta in ed by th e App lied Ffechanics

i s av a i lab le f o r inspec t ion upon reques t.

111.

RESULTS

The r e s u l t s o f t h i s i n v e s t i g a t i o n show t h e s tr es s es i n t he co r

(dur ing e i th er a ho t le g o r c o ld le g LOCA break) t o be w l h i n ASME


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LTR

.

R. K. Bl an df or d, LOCA +

SSE

An a lys is o f t he LOFT Upper Core Ba

F l angel1, LOFT Te ch ni ca l R ep or t LTR 1115-41 (RE-A-78-091), t o b

1eased.

3

S . Fab ic , Compute r P rogram WHAM f o r C a l cu la t i on o f P ressure , V

and F o rc e T r a n s i e n t s i n L i q u i d F i l l e d P i p i n g Sy ste ms , K a i s e r E

Re po rt No. 67-49R, November 1967.

4.

V. T. Ber ta , WHAM Code App l i c a t i o n s t o t h e LOFT Pr im ary Coo l a n

LOFT Te ch ni ca l Re po rt LTR 20-4, Oc tob er 2, 1973.

5 V . T. B er ta , LOFT LOCA-WHAM6 Model and Code A p p l i c a t i o n s , LOF

c a l R ep ort LTR 114-100, to . be r e 1eased.

.

6.

R.

C.

G ue nz le r, Developm ent o f Methods T e ch n ic a l ~ e ~ o r tn SAP

S t r u c t u r a l A n a l y s i s P ro gr am f o r ' S t a t i c a n d Dynam ic R esponse o f

Systems , En gine er in g D iv is io n Tec hn ica l Rep or t TR-775 (AM-1.12

1

1976.

.

7.

R. G. Rahl S t re ss An a lys is o f th e LOFT Core Ba r re l LOFT Te

R e p or t LTR 1115-35 (RE-D -77-197), May

11

1977.

8.

T . R. Thom pso n, S e i sm i c A n a l y s i s o f LOFT ~ e a c t o r n t e r n a l s L

n i c a l Re po rt LTR 1115-31 (RE-E-76-004), Oc tob er 5, 1976.


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