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Measurement of the /sup 238/U Doppler effect in gas-cooled fast reactor critical assemblies

Journal Article · · Nucl. Sci. Eng.; (United States)
OSTI ID:5023786
;
The Doppler effect of a small UO/sub 2/ sample was determined for the temperature range from 300 to 1100 K at the core center of the Argonne National Laboratory gas-cooled fast reactor (GCFR) critical assembly. The measurement provided the first data on the important /sup 238/U Doppler effect in GCFR systems. The normalized value of the GCFR /sup 238/U Doppler effect was found to be 54% smaller than the corresponding value in an equivalent liquid-metal fast breeder reactor (LMFBR) assembly. Calculations with ENDF/B-IV data yielded a calculated/experimental (C/E) ratio of 0.83, which is considerably lower than that in LMFBR assemblies. The reason for this misprediction appears to be an underprediction of the low-energy flux, a feature that seems to be general to hard spectrum assemblies. The /sup 238/U Doppler effect was also determined in a ''steam-flooded'' GCFR assembly. The Doppler effect for the temperature range from 300 to 1100 K increased by 93% relative to the ''dry'' reference value because of spectral softening. The same calculational methods using ENDF/B-IV data resulted in the much better C/E value of 1.00.
Research Organization:
Argonne National Lab., IL
OSTI ID:
5023786
Journal Information:
Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 65:3; ISSN NSENA
Country of Publication:
United States
Language:
English

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Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500* -- Power Reactors
Breeding
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BREEDER REACTORS
DOPPLER COEFFICIENT
EPITHERMAL REACTORS
EVEN-EVEN NUCLEI
FAST REACTORS
FBR TYPE REACTORS
GAS COOLED REACTORS
GCFR REACTOR
GCFR TYPE REACTORS
HEAVY NUCLEI
HELIUM COOLED REACTORS
ISOTOPES
NEUTRON SPECTRA
NUCLEI
RADIOISOTOPES
REACTIVITY COEFFICIENTS
REACTORS
SPECTRA
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES