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Fusion Science and Technology
Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
Jorge J. Sanchez, Warren H. Giedt
Fusion Science and Technology | Volume 36 | Number 3 | November 1999 | Pages 346-355
Technical Paper | doi.org/10.13182/FST36-346
Articles are hosted by Taylor and Francis Online.
A study is conducted on cooling and controlling the thickness of a frozen layer of deuterium and tritium (D-T) on the inner surface of a capsule mounted in a cylindrical hohlraum. Cooling is required to remove the heat released during tritium decay. The layer thickness must be uniform, which requires that the heat flow from the layer into the capsule wall be spherically symmetric. It is shown that this requirement can be satisfied by controlling the temperature rise along the hohlraum wall from the ends to the midplane. The optimum temperature rise depends primarily on the D-T fuel charge and the thermal conductivity of the gas filling the hohlraum. To ensure a layer thickness variation of less than ±0.4 m in a plastic capsule, the temperature rise along the hohlraum wall must be controlled to an accuracy of about ±3.0 mK. However, as the thermal conductivity of the capsule wall increases to metallic material values, the required accuracy of the hohlraum wall temperature rise decreases to ±15 mK.