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Division Spotlight
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
BWXT will scout potential TRISO fuel production sites in Wyoming
BWX Technologies Inc. announced today that its Advanced Technologies subsidiary has signed a cooperation agreement with the state of Wyoming to evaluate locations and requirements for siting a potential new TRISO nuclear fuel fabrication facility in the state.
E. T. Cheng, C. W. Maynard, W. F. Vogelsang, A. C. Klein
Nuclear Technology | Volume 45 | Number 1 | August 1979 | Pages 77-98
Technical Paper | Reactor | doi.org/10.13182/NT79-A32287
Articles are hosted by Taylor and Francis Online.
One of the characteristics of a compact tokamak fusion reactor such as NUWMAK is high power density (∼10 MW/m3) and thus high neutron wall loading (∼5 MW/m2). The most crucial design requirements for a tokamak fusion reactor blanket and shield are (a) adequate tritium breeding ratio (>1.10), (b) high blanket energy multiplication (≥1.2), (c) adequate magnet protection, and (d) low radioactivity. The magnet protection criterion for a compact reactor is particularly essential in the inner region of the torus close to the toroidal axis because of limited space availability for shielding. A very effective shielding material such as tungsten must be used for this purpose. The design requirements have been satisfied by the selection of blanket and shielding materials as well as their zone thicknesses and heights. The nucleonic design features of the NUWMAK are as follows. A tritium breeding ratio of 1.54 is obtained. Li62Pb38 eutectic is used as the breeding and thermal energy storage material. The total nuclear heating in the blanket and shield is ∼17.2 MeV per deuterium-tritium neutron. The performance of the superconducting magnet will be satisfactory for more than 2 yr of continuous operation through the use of a 35-cm-thick tungsten shield that extends 2.5 m above the midplane on the inboard part of the torus. The radioactivity is lowered by using a titanium alloy as the structural material and large amounts of lithium lead as the blanket material. One day after shutdown, the dose rate outside the outer shield drops below 2.6 mrem/h, and it is favorable to hands-on shift maintenance.