Preliminary Report on 2% U²³⁵-Enriched UF₄-C₂₅H₅₂ Critical Assemblies

Technical Report · Wed Apr 22 04:00:00 EST 1959

DOI:https://doi.org/10.2172/4240567· OSTI ID:4240567

Mihalczo, J. T. ^[1]; Lynn, J. J. ^[1]; Scott, Dunlap ^[1]; Connolly, W. C. ^[1]

---

1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

A series of critical experiments with blocks of 2% U²³⁵-Enriched UF₄-C₂₅H₅₂ was initiated at the ORNL Critical Experiments Facility. Thus far assemblies with H:U²³⁵ atomic ratios of 195 and 294 were built in parallelepipedal and simulated cylindrical geometries, both reflected and unreflected. From the results the minimum critical masses for reflected spheres were determined to be 16.3 and 8.5 kg of U²³⁵ for fuel mixtures with H:U atomic ratios of 195 and 294, respectively. The minimum critical masses for unreflected spheres of these two fuel mixtures are 24.3 and 12.7 kg of U²³⁵ respectively.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
• NSA Number: NSA-13-015206
• OSTI ID: 4240567
• Report Number(s): CF-59-4-120
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CONFIGURATION
CRITICAL ASSEMBLIES
CRITICALITY
CYLINDERS
Criticality
Cylinders
DIFFRACTION
EFFICIENCY
Enriched Uranium
Enrichment
FREQUENCY
FUELS
HIGH TEMPERATURE
HYDROCARBONS
LATTICES
MASS
MEASURED VALUES
MIXING
NEUTRON BEAMS
NUMERICALS
Nuclear Criticality Safety Program (NCSP)
REFLECTORS
Reflection
SPHERES
TEMPERATURE
U 235
URANIUM 235
URANIUM TETRAFLUORIDE
Uranium 235
VARIATIONS
X RADIATION