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Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
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International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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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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Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
Frigyes Reisch
Nuclear Science and Engineering | Volume 26 | Number 3 | November 1966 | Pages 378-384
Technical Paper | doi.org/10.13182/NSE66-A17360
Articles are hosted by Taylor and Francis Online.
In a digital computer controlled system it is possible to monitor several variables almost at the same time and control the system according to the most critical one. This is called a sampled-data control system. The purpose of the paper is to demonstrate how to handle such a problem. A simplified reactor system including neutron kinetics and fuel and cooling medium kinetics with a simple control circuit is examined. It is assumed that the reactor has a great number of cooling channels, and it is necessary to check the exit temperatures of the cooling medium as the maximum value is the limiting factor. Sampling is performed to accomplish this. The temperatures are scanned and a comparison is made between the value stored in the memory and the point being measured. The higher of the two values remains in the one word memory. After checking all the temperatures, a pulse representing the temperature of the hottest channel is sent through the sampler to the regulator and the memory is cleared. A suitable method to study the stability is the z transform analysis. The procedures and logic followed are outlined here. First, the system is defined in the terms of Laplace transformation. Then the solving of the sampled system problem by the z transform theory is shown. A digital computer program is developed. The results of several calculations show the importance of choosing the right parameter combinations.