Assessing Several Modeling Approaches in Depletion Studies of a TRISO-Fueled Microreactor

Graduate Thesis Or Dissertation

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Citeable URL: https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j098zk059

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Attribute Name	Values
Creator	Hoffman, Keenan J.
Abstract	The impact of MCNP6 depletion resolution on core lifetime is examined in the context of the Snowflake microreactor with explicit TRISO fuel. The change in core lifetime and iso- tope mass as a result of different tracked isotopes, timesteps, and spatial regions is discussed. Calculation speed of a prototype MCNP delta tracking module is compared to a reactivity- equivalent physical transformation (RPT). Using a single depletion material underpredicts core lifetime by 15%, and the resolution necessary to converge isotope mass greatly depends on the specific isotope, in addition to the size (and location) of the depletion region. The prototype delta tracking module decreases the CPU time of explicit TRISO criticality calcu- lations by 30%, but does not always result in a speedup when used with depletion. Significant depletion speedup is obtained using RPT (50% faster), and all isotope masses agreed within three percent.
License	All rights reserved
Resource Type	Masters Thesis
Date Issued	2023-06-08
Degree Level	Master's
Degree Name	Master of Science (M.S.)
Degree Field	Nuclear Engineering
Degree Grantor	Oregon State University
Commencement Year	2023
Advisor	Palmer, Todd S
Committee Member	Bailey, Mike Gutowska, Izabela Apte, Sourabh
Academic Affiliation	Nuclear Science and Engineering
Rights Statement	In Copyright
Publisher	Oregon State University
Peer Reviewed	No
Language	English [eng]

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