ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
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 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.”
David W. Esh, Barry E. Scheetz
Nuclear Technology | Volume 137 | Number 3 | March 2002 | Pages 241-251
Technical Paper | Radioactive Waste Management and Disposal | doi.org/10.13182/NT02-A3271
Articles are hosted by Taylor and Francis Online.
The chemical and mineralogical conditions of the near-field, i.e., that area in the vicinity of the waste materials, may be significantly altered from ambient conditions by thermohydrological processes resulting from the placement of heat-generating radioactive materials in a geologic repository. Models are developed linking the thermohydrological effects simulated with TOUGH2 to a nonreactive aqueous species (chloride). Perturbations in near-field chemistry from the ambient conditions may have potential impacts on engineered barrier system (EBS) performance, waste-form degradation processes, and radionuclide transport. The results of thermohydrological simulations with TOUGH2 utilizing various conceptual models for fracture representation are coupled to simple chemical models (density and osmotic effects are neglected) to demonstrate the complexity and potential magnitude of thermohydrochemical (T-H-C) processes. The concentration of chloride in solution returning to the EBS following dryout, in extreme cases, is predicted to exceed 100 000 mg/l. The dimensionality of the problem and the rate at which the tuffaceous rocks rewet significantly affect the magnitude of the thermohydrological impact on chloride redistribution. A process metric (initial rewetting rate and distribution) that is ignored when evaluating thermohydrological response is very important when a more complex coupling (T-H-C) is considered.