PULSED NEUTRON EXPERIMENTS WITH FAST ASSEMBLIES
Technical Report
·
OSTI ID:4342475
This is a slight revision of the paper presented at the Theoretical Reactor Physics Conference in Sun Valley, Idaho on Sept. 25, 1957. The pulsed source technique consists of introducing repeated shont bursts of neutrons into a subcritical assembly, and following the decay of the leakage flux as a function of time. This technique is shown to be complementary to the Rossi alpha'' method, being more satisfactory than the latter for slower systems and further from prompt critical. The normal mode decay constants for a number of bare subcritical highly enriched assemblies thus obtained serve as additional normalization data for multigroup cross-sections. Analysis of the data for a set of emriched U spheres indicates that a satisfactory fit cannot be obtained with one group constants, and that the neutron spectrum is slower for smaller assemblies. It is noted that plotting the decay conntant as a function of buckling gives an apparently accurate way to extrapolate to prompt critical. The pulsed source technique can also be used to calibrate control rod and poison worth, and will give some estimate of the prompt neutron lifetime. (auth)
- Research Organization:
- California. Univ., Livermore' Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-12-004465
- OSTI ID:
- 4342475
- Report Number(s):
- UCRL-4998
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE USE OF SUBCRITICAL ASSEMBLIES FOR STUDYING REACTOR PARAMETERS
Prompt Neutron Decay Constants and Subcritical Measurements for Material Control and Accountability in SHEBA
Prompt Neutron Decay Constants in Uranium Diluted with Matrix Material Systems
Technical Report
·
Sat Oct 27 00:00:00 EDT 1962
·
OSTI ID:4740974
Prompt Neutron Decay Constants and Subcritical Measurements for Material Control and Accountability in SHEBA
Conference
·
Mon Oct 05 00:00:00 EDT 1998
·
OSTI ID:674733
Prompt Neutron Decay Constants in Uranium Diluted with Matrix Material Systems
Conference
·
Sun Jun 17 00:00:00 EDT 2001
·
OSTI ID:975109
Related Subjects
BUCKLING-- CRITICAL ASSEMBLIES-- CRITICALITY-- DIAGRAMS-- ENRICHMENT-- FAST NEUTRONS-- FUELS-- NEUTRON FLUX-- PULSE GENERATORS-- PULSES-- ROSSI ALPHA METHOD
CONFIGURATION-- CRITICAL ASSEMBLIES-- CRITICALITY-- CROSS SECTIONS-- ENRICHMENT-- FAST NEUTRONS-- FUELS-- NEUTRON FLUX-- NEUTRONS-- PULSE GENERATORS-- PULSES-- ROSSI ALPHA METHOD-- SPECTRA-- SPECTRAL SHIFT-- SPHERES-- THICKNESS-- URANIUM-- VARIATIONS
CONTROL ELEMENTS-- CRITICAL ASSEMBLIES-- CRITICALITY-- ENRICHMENT-- FAST NEUTRONS-- FUELS-- NEUTRON FLUX-- NEUTRONS-- POISONING-- PROMPT NEUTRONS-- PULSE GENERATORS-- PULSES-- RODS-- ROSSI ALPHA METHOD-- STANDARDS
PHYSICS
CONFIGURATION-- CRITICAL ASSEMBLIES-- CRITICALITY-- CROSS SECTIONS-- ENRICHMENT-- FAST NEUTRONS-- FUELS-- NEUTRON FLUX-- NEUTRONS-- PULSE GENERATORS-- PULSES-- ROSSI ALPHA METHOD-- SPECTRA-- SPECTRAL SHIFT-- SPHERES-- THICKNESS-- URANIUM-- VARIATIONS
CONTROL ELEMENTS-- CRITICAL ASSEMBLIES-- CRITICALITY-- ENRICHMENT-- FAST NEUTRONS-- FUELS-- NEUTRON FLUX-- NEUTRONS-- POISONING-- PROMPT NEUTRONS-- PULSE GENERATORS-- PULSES-- RODS-- ROSSI ALPHA METHOD-- STANDARDS
PHYSICS