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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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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!
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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.”
Mustafa Alper Yildiz, Yassin Hassan (Texas A&M), Haomin Yuan, Elia Merzari (ANL)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 659-669
Helical coil steam generator (HCSG) is a specific type of shell and tube heat exchanger known for having higher heat transfer coefficient than many other designs. For this reason, they are considered in Small Modular Reactor (SMR) and High Temperature Reactor (HTR) designs. Investigation of flow behavior in HCSGs is important for better design. In this paper we present our study on modeling of the coolant flow in the primary side of the HCSG. We used Nek5000, open source, high-order spectral element CFD code developed in Argonne National Laboratory. Nek5000 accepts only hexahedral mesh, which makes very challenging the meshing process for the complicated HCSG geometry. Tet-to-hex meshing strategy was applied to by-pass the geometric complexities. Tetrahedral mesh was created first, and then each tetrahedral element was converted to four hexahedral elements. Boundary layers were extruded to fit the exact geometry. In this study large eddy simulation (LES) was performed at Reynolds number of 9000 based on the inlet velocity and the tube diameter. The employed sub-grid scale model for the LES relies on explicit filtering.