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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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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Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
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 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. 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.”
Tsung-Kuang Yeh, Mei-Ya Wang, Robin Wu
Nuclear Technology | Volume 184 | Number 2 | November 2013 | Pages 148-155
Technical Paper | Fission Reactors | doi.org/10.13182/NT13-A22311
Articles are hosted by Taylor and Francis Online.
For mitigating intergranular stress corrosion cracking in operating boiling water reactors (BWRs), hydrogen water chemistry, a common technique for producing a reducing coolant environment, has been adopted worldwide. However, the issue of accompanied buildup of radiation field at feedwater hydrogen concentrations >0.5 ppm has been a concern of the utilities. In particular, the increase in shutdown dose rate would pose a serious health threat to maintenance workers during outages.To maintain low shutdown dose rates in drywells, the operators of Kuosheng Nuclear Power Plant adopted effective techniques to improve the coolant chemistry in their two BWRs, leading to a reduction in iron concentration in the feedwater and in 60Co activity in the primary coolant. The radiation buildup in the recirculation system was lowered through an optimized management of hydrogen injection during regular operations and an enhanced operation mode of the reactor cleanup system at the early stage of an outage. In the meantime, the shutdown dose rates in the entire primary coolant circuit, especially in the drywell, were also significantly reduced. This paper describes the adopted techniques and results of water chemistry improvement at the Kuosheng nuclear power reactor.