Reactivity Effect of Cross-Section Processing for Moist Bulk-Oxide Criticals

Conference · Mon Nov 12 04:00:00 EST 1979 · Transactions of the American Nuclear Society

OSTI ID:5279210

Bucholz, J. A. ^[1]; Westfall, R. M. ^[1]

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

Good multigroup cross-section data is necessary if accurate analyses of critical or slightly sub-critical systems are performed. How the flux spectrum as calculated by the Nordheim method and by a more exact method can ultimately affect the calculated multiplication and/or critical mass of slightly moderated bulk-oxide systems is shown. Self-shielded multigroup cross sections were generated using the Nordheim method as implemented in the NITAWL code and by a more exact method as implemented in the ROLAIDS code. To eliminate geometric effects, both codes were used to generate cross sections for an infinite homogeneous media of U3O8 and water (U = 4.65% Uranium-235).

• 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)
• OSTI ID: 5279210
• Report Number(s): CONF-791103-
• Conference Information: Journal Name: Transactions of the American Nuclear Society Journal Volume: 33
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420203* -- Engineering-- Handling Equipment & Procedures
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE COMPOUNDS
ACTINIDES
Analyses
CHALCOGENIDES
CRITICALITY
Critical Systems
ELEMENTS
ENRICHED URANIUM
ISOTOPE ENRICHED MATERIALS
METALS
MULTIPLICATION FACTORS
NITAWL Code
NUMERICAL SOLUTION
Nordheim Method
Nuclear Criticality Safety Program (NCSP)
OXIDES
OXYGEN COMPOUNDS
ROLAIDS Code
SAFETY
Self-Shielded Multigroup Cross Sections
Slightly Sub-Critical Systems
URANIUM
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES