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Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Enrique Castillo, Cristina Solares, Patricia Gómez
Nuclear Science and Engineering | Volume 126 | Number 2 | June 1997 | Pages 158-167
Technical Paper | doi.org/10.13182/NSE97-A24469
Articles are hosted by Taylor and Francis Online.
A new method is presented for propagating uncertainties in complex nuclear power plant safety system fault tree models. The method is especially useful for estimating extreme percentiles and high-probability one-sided confidence intervals of the system unavailability. Likelihood weighing simulation methods, which assign a score to each sample point (x1,... ,xn) to compensate for the differences between the sample and the parent distributions, are used to directly simulate the adequate tail distribution of the probability of the fault tree top event. The polynomial structure of the probability of the top event is exploited to sequentially find upper and lower bounds to simulate each of the basic variables, without the need to invert the polynomial expression. The performance of the proposed method is spectacular when compared with the standard Monte Carlo simulation for tails. Finally, one example of application to a real case is used to illustrate the whole simulation process.