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Division Spotlight
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.
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
NRC engineers share their expertise at the University of Puerto Rico
Robert Roche-Rivera and Marcos Rolón-Acevedo are licensed professional engineers who work at the U.S. Nuclear Regulatory Commission. They are also alumni of the University of Puerto Rico–Mayagüez (UPRM) and have been sharing their knowledge and experience with students at their alma mater since last year, serving as adjunct professors in the university’s Department of Mechanical Engineering. During the 2023–2024 school year, they each taught two courses: Fundamentals of Nuclear Science and Engineering, and Nuclear Power Plant Engineering.
Chuan Li, Jian Zhang, Chao Fang
Nuclear Technology | Volume 200 | Number 1 | October 2017 | Pages 45-53
Technical Paper | doi.org/10.1080/00295450.2017.1348874
Articles are hosted by Taylor and Francis Online.
In this paper, the methodology of studying the chemical forms of important fission products (FPs) in the primary circuit of a pebble-bed modular high-temperature gas-cooled reactor (HTR-PM) is given, and the chemical forms of important FPs cesium (Cs), strontium (Sr), argentum (Ag), iodine (I), and corresponding amounts are calculated under the condition of equilibrium core of HTR-PM considering the O2 impurity in the helium coolant of the primary circuit. It is shown that for the Cs element, Cs2O2 and Cs2O may undergo a phase transformation between their nongaseous state and gaseous state, respectively, and for the Sr element, the conversion from SrO2 to SrO is obvious with the increase of temperature. In contrast, the reaction between Ag and O reacts thoroughly, and AgO is very stable under different temperature conditions. There is a turning point in the chemical reaction between Cs and I with the increase of temperature, which illustrates that there exists competition between the I-Cs reaction and the O-Cs reaction. These results provide clear chemical form information of the important FPs in the primary circuit, which is significant to understanding the chemical reaction behavior of radionuclides in HTR-PM.