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Re: Re[2]- Certification of
Reply to: RE>Re[2]: Certification of Typ
A cylindrical container is under compression when the inside is at a lower
pressure than applied on the outside. When the excess pressure is on the
inside, the curved surface is under tension. Tensile strength of the material
is different from its strength under compression. Thus, it makes a difference
whether the excess pressure is on the inside or the outside. The two
conditions test different things and are not equivalent. The only kind of test
that might be valid where the excess pressure may be applied either on the
inside or outside is a leak test in which the pressure differential is kept
small; therefore, the pressure differential in such a test may not be enough to
expose a leak that might occur under certain conditions of handling.
--------------------------------------
Date: 6/30/94 12:12 PM
To: Jack Kay
From: radsafe@romulus.ehs.uiuc.edu
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Date: Thu, 30 Jun 94 11:06:34 -0500
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From: <L691731@lmsc5.is.lmsc.lockheed.com>
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Subject: Re[2]: Certification of Type A Packages
X-Listserver-Version: 6.0 -- UNIX ListServer by Anastasios Kotsikonas
X-Comment: Radiation Safety Distribution List
I know no physical/mechanical reason why your proposal would not work
for demonstrating the required level of package integrity. I have never
seen a regulatory opinion on the idea, but I know that others have done
it in their test programs. Our radwaste broker supplied us with drum
testing data which we could use to support calling our 55 gal. drums 7A
Type A. As I indicated in a previous message, we performed the tests
ourselves anyhow because we weren't satisfied that the generic test
results could be applied to the way we intended to use the package. The
pressure test portion of the supplied data looked good and was done
generally in the manner you suggest. The company that did it was:
Nuclear Sources and Services, Inc., 5711 Etheridge, PO Box 34042,
Houston Texas 77234, (713) 641-0391. You might ask them about their
experience defending the approach to regulators.
Steven Souza, Lockheed Missles and Space Co., Inc.
Alternate Radiation Safety Officer tel (408) 742-0767
Sunnyvale, CA 94089 fax (408) 742-0611
PROFS: SSOUZA Internet: L691731@lmsc5.is.lmsc.lockheed.com
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Date: Wed, 29 Jun 94 12:04:20 -0500
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Subject: Re[2]: Certification of Type A Packages
X-Listserver-Version: 6.0 -- UNIX ListServer by Anastasios Kotsikonas
X-Comment: Radiation Safety Distribution List
This may seem like a very basic question, but, what would
the difference be between putting a container inside a
chamber and dropping the pressure or putting a valve on the
container and increasing the pressure inside. It seems to
me the test is to determine if the container can withstand a
certain pressure differential not necessarily a specific
internal reduced pressure. Correct me if I am wrong, and I
often am, but won't a pressure differential of ten pounds
(random number) have the same effect whether you have
atmospheric pressure on the outside and an increased
pressure on the inside or atmospheric on the inside and some
reduced pressure on the outside. I thought that a good way
to test steel drums would be to install an automotive wheel
stem valve on the lid and pressurize it. You could easily
check the pressure and monitor any decreases in the
pressure. Has, can and should it be tried? Why? Why not?
Gene Forrer