Impact of /sup 57/Fe on neutron penetration in thick sodium-iron shields
The latest release of the VITAMIN-E multigroup cross-section library contains two different versions of neutron cross sections for natural iron, one based on ENDF/B-V MOD-1, and the other on MOD-3. The isotope /sup 57/Fe has four inelastic-scattering levels below 846 keV, the energy of the first excited state in /sup 56/Fe. The importance of the new cross sections was investigated by using both VITAMIN-E versions of the iron cross sections in S/sub 8/P/sub 3/ 174 group ANISN calculations for two Na-Fe shield configurations. In neutron penetration calculations through thick steel regions, /sup 57/Fe can be 10 times more important than is indicated by its isotopic abundance in natural iron. The 14.4-keV inelastic level of /sup 57/Fe is sufficiently important that it may be worthwhile to perform a measurement of this cross section to validate the ENDF/B-V MOD-3 value, which was obtained from nuclear model calculations. Shielding analyses were done with iron cross sections predating ENDF/B-V MOD-3 should be reviewed and may need to be revised.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6471683
- Report Number(s):
- CONF-851115-30; ON: DE86002180
- Resource Relation:
- Conference: American Nuclear Society winter meeting, San Francisco, CA, USA, 10 Nov 1985
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FAST REACTORS
SHIELDING
NEUTRONS
CROSS SECTIONS
BREEDING BLANKETS
CARBON STEELS
INELASTIC SCATTERING
IRON
IRON 57
NEUTRON FLUX
REACTOR MATERIALS
SHIELDING MATERIALS
SODIUM
STAINLESS STEELS
THICKNESS
ALKALI METALS
ALLOYS
BARYONS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DIMENSIONS
ELEMENTARY PARTICLES
ELEMENTS
EPITHERMAL REACTORS
EVEN-ODD NUCLEI
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
IRON ALLOYS
IRON BASE ALLOYS
IRON ISOTOPES
ISOTOPES
MATERIALS
METALS
NUCLEI
NUCLEONS
RADIATION FLUX
REACTOR COMPONENTS
REACTORS
SCATTERING
STABLE ISOTOPES
STEELS
TRANSITION ELEMENTS
210500* - Power Reactors
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654002 - Radiation & Shielding Physics- Shielding Calculations & Experiments- (-1987)