ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
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!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
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.”
W. H. Hedley, F. S. Adams, G. E. Gibbs, D. R. Ming, K. J. Myers, J. E. Wells
Fusion Science and Technology | Volume 21 | Number 2 | March 1992 | Pages 678-682
Safety and Measurement (Monitoring) | doi.org/10.13182/FST92-A29825
Articles are hosted by Taylor and Francis Online.
A probabilistic risk assessment was made on the TERF process in order to establish its expected degree of reliability and to locate places in the system which could be improved by revision of the equipment or the operating procedures. The equipment design of the TERF was evaluated using a fault tree study. The probability of human failures was then evaluated by adding their probabilistic effects to the fault tree and then reevaluating it. It was found that 1) the TERF system is expected to be very reliable, with an annual expected downtime of only 2.35 hours, 2) the expected downtime comes almost entirely from process equipment failure rather than human errors, and 3) that certain equipment changes could be made that increased the system reliability. These equipment changes included 1) making provision for blocking off certain automatic control valves with more reliable manual valves to facilitate their repair and 2) making the two sources of power to the TERF totally independent of each other.