Thermal Analysis of a H1616 Shipping Container - prod.sandia.gov ...

Temperature (F)
60
40
20
0
-20
-40
-60
-80
-100
-120
-140
0 20 40 60 80 100 120 140 160 180 200
Time (min)
Shroud Temperature Difference
Flange Temperature Difference
Figure 35. Temperature Differences for Simulated Thermal Tests (C9SIM vs. ISSIM3).
5 Conclusions
The goal of this analysis has been to show that the experimental thermal tests conducted
for the certification of the H1616 shipping container provide a conservatively high estimate
of the maximum flange temperature, a key measure of the thermal response of the shipping
container. During the thermal tests, dangers associated with the handing of radioactive
material that normally would be prevalent in actual accident conditions were eliminated
by simulating the effects of heat generation by pre-heating empty shipping containers to
temperatures greater than those expected when using filled containers. Federal regulations
also require cooling in a 100 ◦ F environment under a cyclic solar radiation load. In the
actual thermal tests performed for certification, the cooling temperature was close to 40 ◦ F
and no steps were taken to simulate solar insolation effects.
In order to show compliance with the Federal regulations, a computational model was
developed to simulate the thermal response of the C9 thermal test as performed and for
a number of different scenarios that met or exceeded the conditions specified by the Federal
regulations. A one-dimensional finite difference model of the shipping container was
developed in cylindrical coordinates. The model assumes the container is axisymmetric
and allows for variable thermal properties in the radial direction. The model parameters
were calibrated using shroud and flange temperature data obtained from two experimental
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