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
Materials Science & Technology
The objectives of MSTD are: promote the advancement of materials science in Nuclear Science Technology; support the multidisciplines which constitute it; encourage research by providing a forum for the presentation, exchange, and documentation of relevant information; promote the interaction and communication among its members; and recognize and reward its members for significant contributions to the field of materials science in nuclear technology.
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
BWXT will scout potential TRISO fuel production sites in Wyoming
BWX Technologies Inc. announced today that its Advanced Technologies subsidiary has signed a cooperation agreement with the state of Wyoming to evaluate locations and requirements for siting a potential new TRISO nuclear fuel fabrication facility in the state.
W. E. Ray, R. L. Miller, S. L. Schrock, G. A. Whitlow
Nuclear Technology | Volume 16 | Number 1 | October 1972 | Pages 249-262
Technical Paper | Reactor Materials Performance / Material | doi.org/10.13182/NT72-A31191
Articles are hosted by Taylor and Francis Online.
Sodium mass transfer deposits up to 10 mils in thickness have been observed on Type 304 stainless-steel, cold-leg surfaces after 10 000 h of steady-state operation. The magnitude of deposition has been shown to be time and location dependent. Deposit thicknesses will continue to grow over the 40-yr design life of the intermediate heat exchanger (IHX), with the only mechanisms which may tend to limit deposit thicknesses being flow shear forces at the wall, and stresses induced by thermal transients. Some of the physical and chemical properties of typical mass transfer deposits collected from primary and secondary sodium systems have been characterized. The composition was found to be highly dependent on the location in the system, and the first materials to precipitate were rich in chromium, whereas deposits located further downstream contained large amounts of manganese. A 50°F drop in temperature was normally sufficient to initiate precipitation of these deposits. Interpreted in terms of the reactor system, this would indicate that the step change in temperature, encountered when bypass streams are mixed with core coolant sodium, may be large enough to initiate deposition in the isothermal hot-leg piping. In addition to the metallic constituents, carbon concentrations as high as 2% have been measured in the deposits together with significant quantities of nitrogen and oxygen. Since carbides, oxides, and nitrides typically exhibit lower thermal conductivities than metallic elements or alloys, it was expected that the deposits would represent a significant heat transfer resistance. Experiments were designed to measure the degradation in the heat transfer coefficient due to corrosion product deposition in small sodium loop systems. Application of these results to IHX and steam generator designs indicated a 9% reduction in heat transfer.