ML19330C423

Suppl to 800718 Rept, Preliminary Calculations,Ultimate Strength for Hydrogen Explosion,Sequoyah Containment Vessel.

ML19330C423
Person / Time
Site:	Sequoyah
Issue date:	07/30/1980
From:	AMES LABORATORY, ENERGY & MINERAL RESOURCES RESEARCH
To:	Office of Nuclear Reactor Regulation
Shared Package
ML19330C420	List: ML19330C419 ML19330C423
References
CON-FIN-A-4131 NUDOCS 8008080364
Download: ML19330C423 (2)

Text

..

..7,-

LJ SUPFLEMENT T0: ' PRELIMINARY CALCULATIONS, ULTIMATE STRENGTH FOR HYDROGEN EXPLOSION, SEQUOYAH CONTAINMENT VESSEL-(submitted 7/18/80)

TO: F. P.~ Schauer, Chief Structural Engineering Branch Division of System Safety Office of Nuclear Reactor Regulation Nuclear Regulatory Commission Washington, DC 20555 BY: Lowell Greimann-Ames Laboratory Iowa State University

'Ames, IA 50011 DATE:- July 30 --1980-Idealized Pressure Loading The dynamic pressures associated with detonation are not significant for two reasons (see pg. 6).

.'The' detonation time is much smaller than the period of motion of the structure

~t d

T , 0.0000025 0.040 = 6.25(10-5)

. The impulse associated with detonation,dI , is negligible with respect to the impulse from the venting pressure, ly ,

I 1. 375(l'0-5)p 0.015 p v = 9.2(10 )

y or, I d

is about 0.1% of Iy .

Ductility Capacity - Lower Bound A lower-bound on the duct.iity capacity of a pressure vessel is D

C.

This ~value is a design recommendation by- the Welding Institute in the United Kingdom'and is. based upon experimental evidence.* Also, the ASME Rolfe & Barsom,4racture and Fatique Control in Structures, Prentice Hall,11977, pp-. 527-530.

8 00 3.06 0M

- x . - - _ _ -

s l- 3:o Boiler.and' Pres ure Vessel Code ** previously defined the collapse

' pressure of a vessel as the pressure at which the displacement is two i

times the displacement at first yieldirg. Note that both of these values are design recommendations. As such, they incorporate some (unspecified)

L factor of safety--probably between 2 and 3. With this conservative value of ductility capacity,'the ultimate venting pressure would be (front page 14) about 31 psi.

'l ,

ASME Boiler' and Pressure Vessel Code,Section III, Division .1, par.1430, Appendix 11,.1974.

l

~

.y. . , , . ., . -.- - --,