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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.
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2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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 new build procurement considerations
It may seem counterintuitive, but the best time to enhance the ability to support operations and maintenance for a new plant is before construction starts. This is one of many lessons learned by the currently operating nuclear fleet. As construction and startup of many nuclear facilities was completed, it quickly became evident that the ability to efficiently support operations and maintenance was limited. Most of the information necessary to establish and manage procurement of spare and replacement items, maintenance, and configuration of the facilities was unavailable and had to be gathered on a case-by-case, “on-demand” basis. Absence of necessary information and the associated challenges resulted in the need for staff augmentation and multiyear-long projects to develop equipment bills of material and maintenance programs and to perform technical evaluations for the huge quantities of spare and replacement items being requested.
Motomasa Fuse, Naoshi Usui, Nobuyuki Ohta, Yoshiteru Sato, Ryosuke Shimizu, Hideyuki Hosokawa, Tsuyoshi Ito, Yoichi Wada
Nuclear Science and Engineering | Volume 186 | Number 1 | April 2017 | Pages 38-47
Technical Paper | doi.org/10.1080/00295639.2016.1272385
Articles are hosted by Taylor and Francis Online.
We have studied the effects of the oxidizing species on the cobalt radioactivity buildup behavior in boiling water reactors (BWRs) using both experimental results and existing literature data. The oxidizing species used to simulate the normal water chemistry (NWC) condition of BWRs were 200 ppb dissolved oxygen or 200 ppb hydrogen peroxide accompanied by 100 ppb dissolved oxygen. We found that the amount of cobalt deposited on stainless steel specimens in the oxygen-based water chemistry (200 ppb dissolved oxygen) was larger than that in the hydrogen peroxide–based water chemistry (200 ppb hydrogen peroxide and 100 ppb dissolved oxygen). The rate of cobalt deposition in the former chemistry was more than four times larger than that in the latter chemistry. This difference in cobalt deposition behavior can be attributed to two properties of oxides: surface morphology and composition. The film formed in the oxygen-based environment was less dense than the film formed in the hydrogen peroxide–based environment. Regarding the chemical constituents of the oxides, iron chromite is considered to be a major spinel-type oxide formed in oxygen-based environments. Furthermore, some literature data suggest that in hydrogen peroxide–based conditions, hematite-rich oxides are formed instead of magnetite-rich films, which are observed in oxygen-based conditions. These are likely reasons why the stainless steel specimens incorporate more cobalt radioactivity in the oxygen-based environment than in the hydrogen peroxide–based environment. The cobalt buildup behavior after switching from NWC to hydrogen water chemistry (HWC) is also affected by the oxidizing species used to simulate NWC; exposure to hydrogen peroxide–based NWC conditions tends to suppress the cobalt radioactivity buildup after switching from NWC to HWC compared to exposure to oxygen-based NWC.