Measurements of Subcritical Reactivity Using a Pulsed-Neutron Source

Technical Report · Wed Jan 15 00:00:00 EST 1964

DOI:https://doi.org/10.2172/4077017· OSTI ID:4077017

Brown, J. R. ^[1]

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1. General Dynamics Corp. San Diego, CA (United States)

Pulsed neutron source measurements were made for a series of subcritical to critical loadings on a bare U²³⁵ water assembly in slab geometry. For each loading, the assembly was repetitively pulsed, and the time distribution of thermal neutrons in the core was recorded on time analyzers. From these data, the reciprocal die-away time (alpha), the delayed neutron background, and the reactivity of the system were determined. Measurements at various positions in the assembly verified that spatial modes do not affect the reactivity determination.

• Research Organization: General Dynamics Corp. San Diego, CA (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC); USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AT(04-3)-167
• OSTI ID: 4077017
• Report Number(s): GA--4838; CONF--187-68
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BACKGROUND
CONFIGURATION
CRITICAL ASSEMBLIES
CRITICALITY
DELAYED NEUTRONS
DISTRIBUTION
Die-away
Garelis and Russell
MEASURED VALUES
NEUTRON SOURCES
Nuclear Criticality Safety Program (NCSP)
PLATES
PULSE ANALYZERS
PULSES
QUANTITATIVE ANALYSIS
REACTIVITY
REACTOR FUELING
REACTOR TECHNOLOGY
THERMAL NEUTRONS
URANIUM 235
USES
VARIATIONS
WATER