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Critical Parameters of a Uranium Solution Slab-Cylinder System

Journal Article · · Nuclear Science and Engineering
 [1];  [1]
  1. Dow Chemical, Golden, CO (United States). Rocky Flats Div.
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Critical parameters are reported for uranium-solution systems consisting of equally spaced vertical cylinders arranged in a square array resting on the bottom of a 20.3-cm-high square slab tank. Some of these systems were reflected externally. Both the cylinders and the slab contained uranyl-nitrate solution having 490 g of uranium (93.2 wt% 235U)/liter. A system of an 87-cm-high array of sixteen 11.0-cm-diam cylinders on an 11.4-cm-thick solution slab was critical. Here, the slab alone was critical at 12.8 cm. Another critical system was a single 22.4-cm-diam cylinder of effectively infinite height on a solution slab 10.8-cm thick. The 22.4-cm diameter is 93.7% of the critical diameter for an infinite cylinder. Monte Carlo calculations, simulating several typical experimental critical systems, yielded values for keff between 0.958 ± 0.012 and 0.986 ± 0.009.

Research Organization:
Dow Chemical, Golden, CO (United States). Rocky Flats Div.
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
NSA Number:
NSA-24-036544
OSTI ID:
4135080
Journal Information:
Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 3 Vol. 40; ISSN 0029-5639
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English

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Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CRITICALITY
CYLINDERS
MEASUREMENT
MONTE CARLO METHOD
Nuclear Criticality Safety Program (NCSP)
REFLECTION
URANIUM 235
URANYL NITRATES
URANYL NITRATES/critical parameters of reflected cylinder-slab system of uranium-235-enriched
measurements and Monte Carlo calculations of
VARIATIONS