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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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
The power of mentoring young talent
Earnestine Johnson
Even if conditions for mentoring are ideal, there is no guarantee that your employees won’t leave for other opportunities. Mentoring should be viewed as a duty and not as something that slows one’s work progress. In nuclear, we are challenged with striving continuously to become better professionals in our roles. Mentoring can accelerate that journey exponentially.
Although we will encounter employees who will not listen even in the best of mentoring moments, we cannot afford to lessen our efforts. Instead, work with those who welcome your time and your insights, because the nuclear industry can be an overwhelming realm to enter. We grow accustomed to the sheer volume of acronyms we use, the system complexities and nuances, the challenging and stringent regulatory environment, the personal challenges from fellow co-workers, and the high stakes associated with nuclear safety. Any one of these represents a challenge for even the most skilled engineers and technicians—and we sometimes take for granted this insider knowledge, forgetting that newcomers to the field do not yet have that perspective.
Tsuyoshi Misawa, Seiji Shiroya, Keiji Kanda
Nuclear Science and Engineering | Volume 104 | Number 1 | January 1990 | Pages 53-65
Technical Paper | doi.org/10.13182/NSE104-53
Articles are hosted by Taylor and Francis Online.
The Feynman-α experiments were carried out using light-water-moderated and -reflected cores loaded with highly enriched uranium fuel at the Kyoto University Critical Assembly. An experimental technique using a multichannel scaler was developed to improve the accuracy of measurement and to shorten measuring time. Then, the βeff/l values of single and coupled cores with different neutron spectra were measured to demonstrate the capability of the present technique for measuring the prompt neutron decay constant α. Moreover, the Feynman-α method was applied to measuring large subcriticalities. Through these experiments, it is found that the present technique greatly improves the accuracy of a measurement, and the one-point reactor approximation is applicable to a tightly coupled core. It is also found that the subcriticality down to approximately -35 $ can be measured by this method if the position of the neutron detector is chosen carefully, and the present Feynman-α method can be applied to a subcriticality monitoring system.