ML20246L479

Summary of 890214 Meeting W/Util in Rockville,Md Re Pipe Support Calculations.List of Attendees & Handouts Encl

ML20246L479
Person / Time
Site:	Grand Gulf
Issue date:	05/11/1989
From:	Kintner L Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8905180327
Download: ML20246L479 (13)

Text

_ _ _ _ _ _ _ - _ _ _ _ _ _ _

', . May 11, 1989 DISTRIBUTION Docket No. 50-416 FACILITY: Grand Gulf Nuclear Station, Unit 1 LICENSEE: SystemEnergyResources,Inc.(SERI)

SUMMARY

OF FEBRUARY 14, 1989 MEETING WITH SERI REGARDING PIPE SUPPORT CALCULATIONS The meeting was held in the NRC Rockville Offices to discuss the staff's request for additional information (NRC letter to SERI dated January 25,1989).

Enclosure 1 is a list of attendees. Enclosure 2 is a handout prepared by the licensee.

The licensee provided results of'its review of pipe supports for the alternate decay heat removal system to determine effects of torsional loads on the supports. The licensee concluded that, when the effects of torsional loads were considered the resulting total stresses were still within Code allowable stresses and the simplified design calculations were conservative. The licensee agreed to submit results of the calculations.

/s/

Lester L. Kintner, Senior Project Manager Project Directorate 11 1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation

Enclosures:

As stated cc w/ enclosures:

See next page

[GGNSMTG

SUMMARY

2/14]

.a UFG :PM:P FR:D:P Zl'URPR :  :  :  ;  ;;

NAME :LKin ner:jw :EA isam  :  :  :  :  :

DATE :5/))/89 :5/' /89  :  :  :  :  :

0FFICIAL RECCRD COPY 8905180327 890511 3 Fo (

fDR ADOCK 05000416 1l PDC _ _ - _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ - _ -

l t,, ,

H. .c . ., '

'f

' DISTRIBUTION FOR MEETING

SUMMARY

DATED: May 11, 1989 ~

. Facility: GRAND GULF NUCLEAR STATION, UNIT 1 g'DechetJile, NRC"PDR

. Local PDR-PDII-1 Reading T. Murley (12G18) ~'

J. Sniezek (12G18)-

D. Crutchfield (13A2)

S.'Varga (14E4)

E.'Adensam P. Anderson L. Kintner.

0GC E. Jordan (MNBB 3302)

B.' Grimes (9A2)

R. Lipinski (8022)

L. Marsh (9H3)

P. Kuo (9H3)

D. Terao ACRS(10).

R. Borchardt (17D19) cc: Licensee / Applicant Service List i

bl 4 i 1

.4 ,

Mr. W. T. Cottle System Energy Resources Inc. Grand Gulf Nuclear Station (GGNS) cc:

Mr. T. H. Cloninger Mr. C. R. Hutchinson Vice President, Nuclear Engineering GGNS General Manager and Support System Energy Resources, Inc.

System Energy Resources, Inc. P. O. Box 756 P. 0. Box 23054 Port Gibson, Mississippi 39150 Jackson, Mississippi 39205 Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.

Wise, Carter, Child, Steen and Attorney General Caraway Department of Justice  !

P. O. Box 651 State of Louisiana Jackson, Mississippi 39205 Baton Rouge, Louisiana 70804 Nicholas S. Reynolds, Esquire Office of the Governor Bishop Libennan, Cook, Purcell State of Mississippi and Reynolds Jackson, Mississippi 39201 1400 L Street, N.W.

Washington, D.C. 20005-3502 Attorney General Gartin Building Mr. Ralph T. Lally Jackson, Mississippi 39205 Manager of Quality Assurance .

Middle South Utilities System Mr. Jack McMillan, Director Services, Inc. Division of Solid Waste Management 639 Loyola Avenue, 3rd Floor Mississippi Department of Natural New Orleans Louisiana 70113 Resources P. O. Box 10385 Mr. John G. Cesare Jackson, Mississippi 39209 Director, Nuclear Licensing System Energy Resources, Inc. Alton B. Cobb, M.D.

P. O. Box 23054 State Health Officer Jackson, Mississippi 39205 State Board of Health P. O. Box 1700 Mr. C. B. Hogg, Project Manager Jackson, Mississippi 39205 Bechtel Power Corporation P. O. Box 2166 President j Houston, Texas 77252-2166 Claiborne County Board of Supervisors 1 Port Gibson, Mississippi 39150 Mr. H. O. Christensen Senior Resident Inspector Regional Administrator, Region II U.S. Nuclear Regulatory Comission U. S. Nuclear Regulatory Commission Route 2, Box 399 101 Marietta Street Port Gibson, Mississippi 39150 Suite 2900 i Atlanta, Georgia 30323 i

ENCLOSURE 2 h TORSIONAL LOADS ON PIPE SUPPORTS BACKGROUND o Alternate Decay Heat Removal Scope o NRC Audit o NRC Letter SERI Response o Original Analysis o Refined Analysis Results CONCLUSIONS

. .q

'4

_, BACKGROUND Alternate Decay Heat Removal Scope o System Scope (Figure 1) o Pipe Support Scope:

o New Q supports 33 o New Non-Q supports 4 o Q Supports (load increase) 29 o Q-supports (No load increase) 70 o' Non-Q supports (load increase) 18 o Non-Q supports (no load increase) 10 TOTAL 164 NRC Audit Torsional Load Concern o Torsional Loads on Open Sections (Figure 2) o Consideration of Warping Shear Term l

c- n e e ss u -- -o 7K w'

5$  % +5 g!b w r  : -e t is 4 -s o Ibl e, es. a > Ox a

W{

m ,

,. ,F..................................ggn......... ,,

_~

-i e m ---. .,s..... w , Le -

y ag I .

E=

l w

B e

L

=

5 x ..g>4...g........p,4.. x

• 5 2 . s gw

= a 2

W 2 5h l W U. Is 3

: as. cu( 3! E a

a

!. . % ,.c> o. . . . . ; . . . .!

a p

r L . ._. . . . . . . ._ . y * -.

s a 5 s 8 e e

a a .

~ '

@ Q e F O F 2 :s (O P (O * ( <

W W  ! 5

• x a E eccn .....a f

c.

e g _I I

. I J

5  %?

(* m' I $

6 0 C',

i I  ;; 5-

"^ r',

C .'+ H +.', _ _ -

,' + e' ,

C+ @ g l "

' l s:,, 3 W-T9994 f g1 ;

I '

. imes ones' "

g in '

M t w _

e e E a.

A a } e

• +

- Epm a

O l

N xO .y a.

u 6 1 E

/\ /\ ~ _,,

d

-m zm W

LE E = E.s;

\ \

~. \i i s, , - -

s WARPING SHEAR STRESSES

\

i s

\

e

- \

\g \

(

\ ___

Ng

\\ \ I h_ _ ) \ s

\\ s [

\W \\

'g

\

c .

g\ ,

\g

\, ,\

TORS /ON \

WARPING NORMAL STRESSES

( BENDING )

.x

\ WARPING TORSION

\

\

\

\

\

s lllIllll \

,__ L:_ E n~r~ A i

a

- H

} "- /

I (= =D : 1 l l

PURE TORSIONAL \

SHEAR STRESSES

\

ST. VEN ANT TORSION

( r GU R E 2) i 4

ape SUDDOT

p i

NV

/

J $

) -

sl  !

CLOSED SECTONS (TUBE STEEL) e,A , (

.x / .J N ,

l l

?R VARY - ORS O\

l 4

L _ _ _ _ _ . _ _ _ _ _ _ _ . _ _

t 'I 't- SU -t'U C NOTE: ALL MEMBERS ARE WIDE FLANGE SECTIONS (I-BEAM).

- i

( %p i

~

\

j<

'N -

. l -

o 1 ,-

\! .'s.

8

~.

i \ C J E \ ~~A _. ~~0 RS O s (DUE TO FRICTION) 1 l

h

SERIRESPONSE Original ADHRS Calculations o Agree that warping shear term not explicitly considered o However, calculations were considered acceptable:

o Simplified St. Venant pure torsion ' approach very conservative o Warping shear term is a small effect o Simplified St. Venant approach envelopes warping shear component 4 o Resulting calculations are conservative

7 .

,y

'- W . .

Refined. Analysis:

o' SERI agreed to revise calculations:

o Consider warping shear o Refined St. Venant pure torsion shear o Scope:

o Supports reevaluated: 164 o Open Section with Torsional Loads: 12 o Results: .,

o Code Allowable met in all cases o Resultant open section shear loads reduced by a factor of 45% or more I o Conservatism of the original calculations confirmed l

l

,c m  : ,

. ; y; ,

l 1

j CONCLUSIONS o Original ADHRS pipe support calculations were conservative o No safety significance ..

o No further evaluation warranted h

@