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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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August 2024
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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.
Ove Edlund
Fusion Science and Technology | Volume 28 | Number 3 | October 1995 | Pages 846-852
Tritium Safety | Proceedings of the Fifth Topical Meeting on Tritium Technology in Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 | doi.org/10.13182/FST95-A30510
Articles are hosted by Taylor and Francis Online.
A general dynamic model consisting of 14 compartments simulating the distribution of tritium into milk and its constituents in lactating dairy cows was developed. The model is calibrated to fit the results obtained in two experiments, where cows were given tritiated water in one experiment (A) and tritiated hay in the second (H) one. The model estimates the activity concentration in the whole milk and its constituents as a function of time. In the next step the COWTRI model will be fitted to a “normalized” cow for which the weight, the daily intake of organic bound hydrogen (OBH), the milk faeces- and urine production are defined. In this version of the model the normalization procedure is only performed concerning intake of OBH. The purpose with this detailed model was to estimate the contribution of the ingested tritium to OBT in milk besides the whole milk itself. From this information it will be possible to simplify the model to one organic part and one non organic part of the milk. The model needs further testing against independent data before it can be simplified for a close assessment model attributed to accidental and continuous operational releases of tritium to an environment where the exposure pathway via milk consumption has to be considered.