Thermal-hydraulic Assessment of the Proposed NIST Neutron Source Design
Anil Gurgen, Abdullah Weiss, Joy Shen
To replace the ageing reactor at the NIST Center for Neutron Research, a new reactor design is proposed, namely the NIST Neutron Source or NNS. The NNS will contain a light-water moderated and cooled core that would serve as a neutron source for a state-of-the-art facility for neutron scattering and irradiation experiments to the domestic and international scientific community. The core is planned to use a 3x3 rectangular core fueled with low-enriched U-10Mo curved plates with aluminum cladding, where each assembly contains 21 plates, yielding a total of 64 coolant channels in each row in the core. This work details the development of a custom thermal-hydraulics analysis model capable of computing flow rates and axial temperature distributions of the coolant, the cladding, and the fuel. Analyses include temperature distributions, and thermal safety margins such as the Critical Heat Flux Ratio (CHFR) and the Onset of Flow Instability Ratio (OFIR). This work also discusses how the operation parameters affect the temperature fields and safety margins of the NNS.
August 20-25, 2023
Washington, DC, US
20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics
, Weiss, A.
and Shen, J.
Thermal-hydraulic Assessment of the Proposed NIST Neutron Source Design, 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Washington, DC, US, [online], https://doi.org/10.13182/NURETH20-40169, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936315
(Accessed December 3, 2023)