ABSTRACT
The GHARR-1 is in the final stages of converting its HEU (90.2 %) fuel to LEU (13 %)
fuel. Due to the differences if the LEU core design as compared to that of the HEU;
fuel density, dummy arrnagement, number of fuel elements, this study was carried out
characterize the neutron spectrum at the irradiation sites of GHARR-1 to ascertain the
impact of the conversion on the neutron spectrum. This was done theoretically using the
MCNP5 code. The neutron spectrum parameters (a and f ), neutron fluxes and their axial
variation were determined. Average results of a for the LEU (inner sites, -0.096; outer sites,
-0.031) as compared to the HEU (inner sites, -0.103; outer sites, -0.034) indicate a further
deviation from the ideal 1/E epithermal spectrum distribution for the HEU as compared to
the LEU. Results of f for the HEU (inner sites, 18.76; outer sites, 48.75) and LEU (inner
sites, 17.77; outer sites, 45.08) indicate some levels of neutron flux trade off in the LEU
as compared to the HEU. This is attributed to the increased inventory of 238U in the LEU
as compared to the HEU. The neutron flux distribution showed high levels of uniformity
at the irradiation sites (2 % to 10 % variation), with the thermal neutron flux showing the
highest level of uniformity. The flux distribution for GHARR-1 with HEU and LEU both
followed similar patterns.
OSEI, B (2021). Characterization Of Ghana Research Reactor-1 Low Enriched Uranium Core Irradiation Sites Using A Theoretical Method. Afribary. Retrieved from https://afribary.com/works/characterization-of-ghana-research-reactor-1-low-enriched-uranium-core-irradiation-sites-using-a-theoretical-method
OSEI, BERNARD "Characterization Of Ghana Research Reactor-1 Low Enriched Uranium Core Irradiation Sites Using A Theoretical Method" Afribary. Afribary, 19 Apr. 2021, https://afribary.com/works/characterization-of-ghana-research-reactor-1-low-enriched-uranium-core-irradiation-sites-using-a-theoretical-method. Accessed 22 Dec. 2024.
OSEI, BERNARD . "Characterization Of Ghana Research Reactor-1 Low Enriched Uranium Core Irradiation Sites Using A Theoretical Method". Afribary, Afribary, 19 Apr. 2021. Web. 22 Dec. 2024. < https://afribary.com/works/characterization-of-ghana-research-reactor-1-low-enriched-uranium-core-irradiation-sites-using-a-theoretical-method >.
OSEI, BERNARD . "Characterization Of Ghana Research Reactor-1 Low Enriched Uranium Core Irradiation Sites Using A Theoretical Method" Afribary (2021). Accessed December 22, 2024. https://afribary.com/works/characterization-of-ghana-research-reactor-1-low-enriched-uranium-core-irradiation-sites-using-a-theoretical-method