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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
Latest News
Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
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.