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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
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
Kazuaki Kito, Rui Hu, Mujid S. Kazimi
Nuclear Technology | Volume 171 | Number 1 | July 2010 | Pages 1-13
Technical Paper | Reactor Safety | doi.org/10.13182/NT10-A10768
Articles are hosted by Taylor and Francis Online.
The Large Assembly with Small Pins (LASP) concept is an evolutionary fuel design proposed to enable a higher power density in boiling water reactors while maintaining the same operating conditions, such as power-to-flow ratio, core inlet conditions, and fuel-to-moderator ratio. It is based on replacing four traditional assemblies and the large water gap regions between them with a single large assembly having a 22 × 22 square fuel pin lattice. Twenty-five water rods within the assembly help maintain neutron moderation and accommodate as many finger-type control rods. It was previously shown that the LASP core allows operation with 20% higher power density than the core with traditional 9 × 9 fuel assemblies. However, the void reactivity coefficient of the LASP core is 25% more negative. In this study, the stability performance of the LASP core has been evaluated.The characteristics of density wave oscillations in the LASP core and their sensitivity to the operating parameters have been investigated. Although the perturbation decay ratios for the LASP core were found to be greater than those of the reference core, the stability criteria are sufficiently satisfied. Sensitivity studies were performed on the effects of design and operating parameters. It can be concluded that the LASP and the reference core have similar sensitivity to operating parameters. Furthermore, the calculated decay ratios were much smaller than the stability criterion for all the considered parameter ranges.