Impact analysis of stainless steel spent fuel canisters Page: 3 of 9
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a Silicon Graphics (SGI) Challenge class
workstation operating on the ULTRIX 6.2
system. The analysis program is the LS-
DYNA3D version of Livermore Software
Technology Corporation (LSTC), version
936.02.
The finite element model of the canister
assembly has been developed using the program
LS-INGRID, version 3.4. Figure 1 shows a
general view of the finite element model
representation of the canister assembly. Figures
2 and 3 show enlarged views of the bottom plug
and skirt assembly near the bottom plug
assembly. These figures present the detail
associated with the pin-tang and interference
section that provides seal to the canisters. The
finite element model of the canisters has 24,133
node points, 15,148 solid elements, and 3.060
shell elements. There are 11 contact surfaces.Figure 1-FE Model of Canister Assembly
The solid elements are constant stress
single integration point elements. The shell
elements are Hughes-Lui shells with 2
integration points through the thickness. Most of
the contact surface is modeled using theAding-
with-friction-and-voids formulation. The
coefficients of Coulumb and Raleigh friction
have an assigned value of 0.3. The region where
the interferences exist (between the canister shell
and the bottom plug) is modeled using a
breakaway contact model. In this contact region,
the breakaway shear force has been
experimentally measured, and it was found to be
within the range between 1,383 and 1,712 lbs.
The model uses a value of 1,550 lbs that is the
threshold shear beyond which there is relative
motion allowed between the plug and the skirt.Figure 2- Bottom Plug Assembly
The model includes a material model
with failure for the pins and the region of the
skirt that contacts the pins. In this material
model, those elements that achieve a strain level
greater than the effective ultimate strain of the
material are automatically removed from the
model simulation. The interface between the pins
attached to the lower plug and the tangs that
provide support to these pins is modeled using an
erosion type contact. This contact model
automatically generates the necessary segments
that that define the contact when the deleted
(failed) elements are removed from the analysis.
The top plug assembly is modeled using
a combination of shell and brick elements.
Figure 4 shows details of the finite element
model of the top plug assembly welded to the
canister skirt. That part of the canister shell that
exists beyond 1 inch from the bottom and the
bottom of the top plug is modeled using shell
elements with the correct shell thickness. The
lower 1-inch of the skirt is modeled using four
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Aramayo, G. A. & Turner, D. W. Impact analysis of stainless steel spent fuel canisters, article, April 1998; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc704741/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.