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Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
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.”
J. Ramon Ramirez, Gustavo Alonso, Robert T. Perry, Javier Ortiz-Villafuerte
Nuclear Technology | Volume 156 | Number 3 | December 2006 | Pages 247-255
Technical Paper | Fuel Cycle and Management | doi.org/10.13182/NT06-A3788
Articles are hosted by Taylor and Francis Online.
Reprocessing benefits are still being debated from the standpoint of economy. However, it is a clear option to reduce the amount of depleted fuel assemblies and a reduction of the reactor plutonium inventories. Several mixed-oxide (MOX) fuel concepts have been considered as an option for mixed-fuel reload assemblies in boiling water reactors in the past. In this work, a new MOX fuel assembly design is proposed. The design is based on the use of a proportional fissile ratio between equivalent fissile plutonium (239Pu + 241Pu) and fissile uranium (235U). This is referred to as the PUF ratio. Furthermore, the moderation ratio will be increased in the assembly as a way to reduce the possible impact of using MOX fuel on the reactivity control systems. The design and performance of the MOX fuel assembly and the mixed core are presented and discussed. The new design, for the cases considered, can increase the MOX batch reload up to 52 MOX assemblies, in comparison with the 24 assemblies from a design that does not increase the moderation ratio. The use of the combined PUF ratio and increased moderation ratio for the MOX assembly allows for a reduction in the average enrichment of fissile plutonium to 4.68 wt%, instead of the 6.75 wt% necessary without increasing the moderation ratio. Both MOX designs produce the same amount of energy during the proposed cycle length and satisfy the same thermal limits. Some comparisons are performed between the core with this MOX fuel assembly and the core that uses only standard uranium assemblies.