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Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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.
Masato Takahashi, Kenichi Yoshioka
Nuclear Technology | Volume 187 | Number 3 | September 2014 | Pages 316-327
Technical Paper | Reactor Safety | doi.org/10.13182/NT13-114
Articles are hosted by Taylor and Francis Online.
The three radioactive isotopes of 134Cs, 136Cs, and 137Cs related to the boiling water reactor (BWR) accident at the units of the Fukushima Daiichi nuclear power plant (NPP) have been measured in samples obtained from NPPs around the area and from inside the Fukushima Daiichi buildings. Numerical calculations with sensitivity analyses were carried out to estimate the cesium (Cs) isotope composition in the BWR core, and the origins of the Cs in the samples were clarified based on numerical calculations. Most of the measured Cs radioactivity data suggest that Cs was released from the homogenized state among fuel bundles with different irradiation histories in the core. The origins of the large 134Cs/136Cs ratios in the Unit 2 spent fuel pool (SFP) suggest two possibilities. One possibility is the existence of a partial release process from the fuel bundles located in the peripheral core region, and the other is damage to the fuel placed in the SFP.