Nuclear criticality safety study of loss of moderation control in 10-ton and 2 1/2-ton UF sub 6 cylinders by KENO V. a computer code analyses
The purpose of this study was to estimate the required amounts of water entering these large UF{sub 6} cylinders to react with, and to moderate the uranium compounds sufficiently to cause criticality. Hypothetical accident situations were modeled as a uranyl fluoride (UO{sub 2}F{sub 2}) slab above a UF{sub 6} hemicylinder, or a UO{sub 2}F{sub 2} sphere centered within a UF{sub 6} hemicylinder, and were investigated by computational analyses utilizing the KENO V.a{sup (3)} Monte Carlo Computer Code. Assumptions, descriptions, and results of the KENO computer code calculations are presented and discussed. The 2 1/2-ton cylinder was evaluated at 5.0% U-235, and the 10-ton cylinder was evaluated at both 4.5% and 5.0% U-235 enrichments. The minimum estimated amounts of water required for criticality were five gallons of water for a spherical geometry, and 129 gallons of water for a slab geometry in a 10-ton cylinder containing UF{sub 6} at 5.0% enrichment. For the 2 1/2-ton cylinder at 5.0% U-235 enrichment, the minimum estimated amounts were six gallons of water for a spherical geometry, and 57.5 gallons of water for a slab geometry. 5 refs., 7 figs., 3 tabs.
- Research Organization:
- Martin Marietta Energy Systems, Inc., Piketon, OH (USA)
- Sponsoring Organization:
- DOE/DP; USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
- DOE Contract Number:
- AC05-76OR00001
- OSTI ID:
- 5235691
- Report Number(s):
- POEF-T-3495; ON: DE90004209
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Handling
& Storage
055001 -- Nuclear Fuels-- Safeguards
Inspection
& Accountability-- Technical Aspects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
ACTINIDE COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPUTER CODES
CRITICALITY
CYLINDERS
FLUORIDES
FLUORINE COMPOUNDS
FUEL ELEMENTS
FUEL SPHERES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
K CODES
Nuclear Criticality Safety Program (NCSP)
OXIDES
OXYGEN COMPOUNDS
REACTOR COMPONENTS
SAFEGUARDS
SAFETY
SLABS
URANIUM COMPOUNDS
URANIUM FLUORIDES
URANIUM HEXAFLUORIDE
URANIUM OXIDES
WATER