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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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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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Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
C. R. Walthers, E. M. Jenkins, D. W. Sedgley, T. H. Batzer, S. Konishi, S. O'Hira, Y. Naruse
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1811-1813
Impurity Control and Plasma-Facing Component | Proceedings of the Ninth Topical Meeting on the Technology of Fusion Energy (Oak Brook, Illinois, October 7-11, 1990) | doi.org/10.13182/FST91-A29606
Articles are hosted by Taylor and Francis Online.
In 1988, a prototypical vacuum system was added to the Tritium Systems Test Assembly (TSTA) at Los Alamos National Laboratory. Since then various pumping scenarios, which might be expected in a fusion reactor, have been performed without any serious shortcomings being apparent in the use of compound cryopumps as reactor high vacuum pumps. Last year, the question of whether a compound pump was necessary was addressed in a pair of runs in which deuterium helium mixtures were pumped on a single 4K activated charcoal panel. In these tests, the condensing stage of the pump was maintained at 77K and did not contribute to pumping either deuterium or helium. Results were very encouraging: in both tests the charcoal readily pumped helium until a max loading of 0.4 T 1 cm−2 of helium on charcoal was attained. Helium speed was not affected by deuterium which may have been pumped by either a condensing or sorbing mechanism or by a combination of both. In addition, the helium loading at saturation was 0.4 T 1 cm−2 even though the D2/He ratio was doubled between runs. Conjecture about why the charcoal helium capacity was constant led to the pump operation described in this paper. It was felt that measurement of helium capacity after careful deuterium preloads might help to explain the mechanism involved in co-pumping of a condensible and a noncondensible on a single 4K cryosorber surface. This paper presents the results of series of helium capacity runs preceded by a range of deuterium preloads and attempts to explain the mechanism involved.