Measurements of the Effective Delayed-Neutron Fraction in Two Fast Critical Experiments
Journal Article
·
· Nuclear Science and Engineering
- Argonne National Laboratory (ANL), Idaho Falls, IL (United States)
Here, the effective delayed-neutron fractions of 235U and 239Pu have been determined for two fast critical assemblies from measurements of the absolute fission rate and the apparent reactivity worths of a calibrated 252Cf neutron source. The experimental values of βeff for the two fissile isotopes, 0.0078 to 0.00233, respectively, are in reasonable agreement with calculations. The results do not explain the 30% discrepancy in measured and calculated reactivity values in fast critical experiments.
- Research Organization:
- Argonne National Laboratory (ANL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-31109-ENG-38
- NSA Number:
- NSA-27-021889
- OSTI ID:
- 4573593
- Journal Information:
- Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 2 Vol. 49; ISSN 0029-5639
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
CRITICAL ASSEMBLIES/reactivity worths of uranium-235 and plutonium-239 in ZPR-3
(E)
DELAYED NEUTRON FRACTION
DELAYED NEUTRONS
FAST REACTORS
NEUTRONS
DELAYED/effective fractions for uranium-235 and plutonium-239 in fast critical assemblies
(E)
Nuclear Criticality Safety Program (NCSP)
PLUTONIUM 239
PLUTONIUM ISOTOPES Pu-239/neutron fraction in fast critical assemblies
effective delayed
(E)
REACTIVITY WORTHS
URANIUM 235
URANIUM ISOTOPES U-235/neutron fraction in fast critical assemblies
effective delayed
(E)
ZERO POWER REACTORS
CRITICAL ASSEMBLIES/reactivity worths of uranium-235 and plutonium-239 in ZPR-3
(E)
DELAYED NEUTRON FRACTION
DELAYED NEUTRONS
FAST REACTORS
NEUTRONS
DELAYED/effective fractions for uranium-235 and plutonium-239 in fast critical assemblies
(E)
Nuclear Criticality Safety Program (NCSP)
PLUTONIUM 239
PLUTONIUM ISOTOPES Pu-239/neutron fraction in fast critical assemblies
effective delayed
(E)
REACTIVITY WORTHS
URANIUM 235
URANIUM ISOTOPES U-235/neutron fraction in fast critical assemblies
effective delayed
(E)
ZERO POWER REACTORS