Thermal Analysis of a H1616 Shipping Container - prod.sandia.gov ...
Thermal Analysis of a H1616 Shipping Container - prod.sandia.gov ...
Thermal Analysis of a H1616 Shipping Container - prod.sandia.gov ...
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Temperature (F)<br />
60<br />
40<br />
20<br />
0<br />
-20<br />
-40<br />
-60<br />
-80<br />
-100<br />
-120<br />
-140<br />
0 20 40 60 80 100 120 140 160 180 200<br />
Time (min)<br />
Shroud Temperature Difference<br />
Flange Temperature Difference<br />
Figure 35. Temperature Differences for Simulated <strong>Thermal</strong> Tests (C9SIM vs. ISSIM3).<br />
5 Conclusions<br />
The goal <strong>of</strong> this analysis has been to show that the experimental thermal tests conducted<br />
for the certification <strong>of</strong> the <strong>H1616</strong> shipping container provide a conservatively high estimate<br />
<strong>of</strong> the maximum flange temperature, a key measure <strong>of</strong> the thermal response <strong>of</strong> the shipping<br />
container. During the thermal tests, dangers associated with the handing <strong>of</strong> radioactive<br />
material that normally would be prevalent in actual accident conditions were eliminated<br />
by simulating the effects <strong>of</strong> heat generation by pre-heating empty shipping containers to<br />
temperatures greater than those expected when using filled containers. Federal regulations<br />
also require cooling in a 100 ◦ F environment under a cyclic solar radiation load. In the<br />
actual thermal tests performed for certification, the cooling temperature was close to 40 ◦ F<br />
and no steps were taken to simulate solar insolation effects.<br />
In order to show compliance with the Federal regulations, a computational model was<br />
developed to simulate the thermal response <strong>of</strong> the C9 thermal test as performed and for<br />
a number <strong>of</strong> different scenarios that met or exceeded the conditions specified by the Federal<br />
regulations. A one-dimensional finite difference model <strong>of</strong> the shipping container was<br />
developed in cylindrical coordinates. The model assumes the container is axisymmetric<br />
and allows for variable thermal properties in the radial direction. The model parameters<br />
were calibrated using shroud and flange temperature data obtained from two experimental<br />
41