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
Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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
May 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
June 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Securing the advanced reactor fleet
Physical protection accounts for a significant portion of a nuclear power plant’s operational costs. As the U.S. moves toward smaller and safer advanced reactors, similar protection strategies could prove cost prohibitive. For tomorrow’s small modular reactors and microreactors, security costs must remain appropriate to the size of the reactor for economical operation.
K. Vamsi Krishna, Sriharitha Rowthu, Vijay N. Nadakuduru, Ganesh Pilla, N. Kishore Babu
Fusion Science and Technology | Volume 80 | Number 1 | January 2024 | Pages 68-81
Research Article | doi.org/10.1080/15361055.2023.2182119
Articles are hosted by Taylor and Francis Online.
Titanium alloys are extensively used in aerospace applications due to their high strength-to-weight ratio, corrosion resistance, and outstanding mechanical performance. However, welding these alloys is difficult as they are highly reactive to environmental gases (O, N, and H) above 500°C. Aerospace structures require joints of high integrity to meet the design requirements. To this concern, gas tungsten arc welding (GTAW) offers the potential to achieve welds of equal quality to electron beam welding or laser beam welding at much lower capital costs. The present study reports the influence of heat input on the evolution of microstructure and mechanical properties of Ti-15V-3Al-3Cr-3Sn (Ti-1533), a metastable beta titanium alloy welded by GTAW. The heat input can be controlled by different welding parameters like current, voltage, and welding speed. However, welding speed (15, 20, and 25 cm/min) is a crucial welding parameter that influences the cooling rate (product of thermal gradient and growth rate) and heat input. The microstructure of the fusion zone (FZ) consists of coarse columnar β grains, and coarse equiaxed β grains in the heat-affected zone, while the base metal comprises fine equiaxed β grains in all welding speeds. The average width of the FZ was found to decrease with an increase in welding speed due to lower heat input and higher cooling rate. The welds at 25 cm/min welding speed showed higher ultimate tensile strength (UTS) (654 ± 5 MPa) and hardness (240 HV) compared to 15 cm/min welding speed (UTS 593 ± 5 MPa; hardness 230 HV). The higher strength in the as-welded sample at 25 cm/min welding speed can be attributed to the lower columnar width of the β grains and the formation of equiaxed grains at the bottom portion of the weld zone. A similar trend was observed in samples subjected to the postweld heat treatment for all the weld speeds. Postweld aging of the welds prepared at 25 cm/min speed showed uniform α precipitates in the β matrix, as evidenced by transmission electron microscope results.