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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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Utility Working Conference and Vendor Technology Expo (UWC 2024)
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.”
Z. W. Lin
Nuclear Technology | Volume 166 | Number 3 | June 2009 | Pages 273-282
Technical Paper | 2007 Space Nuclear Conference / Radiation Protection | doi.org/10.13182/NT09-A8841
Articles are hosted by Taylor and Francis Online.
In space radiation calculations it is often useful to calculate the dose or dose equivalent in blood-forming organs (BFOs), the eye, or the skin. It has been customary to use a 5-cm equivalent sphere to approximate the BFO dose. However, previous studies have shown that a 5-cm sphere gives conservative dose values for BFOs. In this study we use a deterministic radiation transport with the Computerized Anatomical Man model to investigate whether the equivalent-sphere model (ESM) can approximate organ doses in space radiation environments. We have determined the organ-specific constant radius parameters and the corresponding average errors of using the ESM at those radius parameters. We find that for galactic cosmic ray (GCR) environments, the ESM with a constant radius parameter works well in estimating the dose and dose equivalent in BFOs, the eye, or the skin, and the average errors of using the ESM are all <2%. For solar particle event (SPE) environments, however, the radius parameters for organ dose or dose equivalent increase significantly with the shielding thickness, and the model works marginally for BFOs but is unacceptable for the eye or the skin. To estimate the dose equivalent in BFOs, for example, the constant radius parameter is determined to be ~10.5 cm for GCR environments and ~7.8 cm for SPE environments, and the corresponding average error of using these radius parameters in the ESM is 0.7% and 17%, respectively.