Calculational criticality analyses of 10- and 20-MW UF[sub 6] freezer/sublimer vessels
Calculational criticality analyses have been performed for 10- and 20-MW UF[sub 6] freezer/sublimer vessels. The freezer/sublimers have been analyzed over a range of conditions that encompass normal operation and abnormal conditions. The effects of HF moderation of the UF[sub 6] in each vessel have been considered for uranium enriched between 2 and 5 wt % [sup 235]U. The results indicate that the nuclearly safe enrichments originally established for the operation of a 10-MW freezer/sublimer, based on a hydrogen-to-uranium moderation ratio of 0.33, are acceptable. If strict moderation control can be demonstrated for hydrogen-to-uranium moderation ratios that are less than 0.33, then the enrichment limits for the 10-MW freezer/sublimer may be increased slightly. The calculations performed also allow safe enrichment limits to be established for a 20-NM freezer/sublimer under moderation control.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6694484
- Report Number(s):
- ORNL/CSD/TM-288; ON: DE93009871
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CRITICALITY
COMPUTER CALCULATIONS
URANIUM HEXAFLUORIDE
ANALYTICAL SOLUTION
ENRICHED URANIUM
FREEZERS
HYDROFLUORIC ACID
S CODES
SAFETY
SUBLIMATION
ACTINIDE COMPOUNDS
ACTINIDES
COMPUTER CODES
ELEMENTS
EVAPORATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOTOPE ENRICHED MATERIALS
MATERIALS
METALS
PHASE TRANSFORMATIONS
URANIUM
URANIUM COMPOUNDS
URANIUM FLUORIDES
050500* - Nuclear Fuels- Uranium Enrichment
054000 - Nuclear Fuels- Health & Safety