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
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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
May 2025
Nuclear Technology
Fusion Science and Technology
Latest News
TerraPower begins U.K. regulatory approval process
Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.
TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.
W. Ullrich, W. Frisch
Nuclear Technology | Volume 41 | Number 2 | December 1978 | Pages 185-194
Technical Paper | Extraction of Energy From Nuclear Fuels Without Reprocessing to Separate Plutonium / Reactor | doi.org/10.13182/NT78-A32104
Articles are hosted by Taylor and Francis Online.
A detailed study of anticipated transients without scram (ATWS) has been carried out in the Federal Republic of Germany based on a boiling water reactor (BWR) and a pressurized water reactor (PWR) reference plant. The study includes transient calculations as well as reliability analyses of the entire scram system (sensors, logic, actuating system). In addition, the influence of other safety related systems (pressure relief system, pump control system in a BWR) has been evaluated. During all ATWS, system pressure does not exceed 110% of design pressure. Only for short periods (several seconds) and only in small areas of the core might film boiling occur. The availability of the scram systems for both a BWR and a PWR is on the order of 10−5 per demand. From these results it is concluded that no independent second scram system is necessary. However, the detailed analysis has given an indication of where hardware measures could be taken to mitigate the transients (e.g., increase of valve capacity) or further improve the availability of the scram system.
