Critical three-dimensional arrays of neutron interacting units.   Part IV. Arrays of U(93.2) metal reflected by concrete and arrays separated by vermiculite and reflected by polyethylene

Magnuson, D.W.

doi:10.2172/4488848

Cited by 3 publications

(6 citation statements)

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“…The values given for the D94278 analysis as well as those in the analysis for Requisition No. 684639 generally agree with those calculated from the atom-density composition given in Ref 1…”

supporting

confidence: 84%

“…The main critical material in this series of experiments consisted of eight 10.8 cm tall highly enriched uranium (HEU) metal cylinder pairs with an outside diameter of 11.52 cm and a reported average mass of 20.962 kg (misstated as 20.962 g in Ref. 1). The cylinders were constructed of two units each, and the two units were stacked together to form a cylinder of the given dimensions; for this reason, these units are sometimes referred to as cylinder pairs.…”

Section: Uranium Pieces -mentioning

confidence: 99%

“…Smaller uranium cylinders of the same diameter as the above cylinder pairs, but weighing 5.2 kg and having a height of 2.7 cm, were placed on top of the larger cylinders in certain permutations (Ref. 1). Also, thin uranium blocks were placed on the main cylinders to produce reactivity changes.…”

Section: Uranium Pieces -mentioning

confidence: 99%

“…However, the dimensions given in the table in Ref. 1, which describes the details of the geometry of the configurations, indicates the thicknesses in cm of the layers of added thin blocks to only two decimal places, namely 0.16 cm, 0.32 cm, 0.48 cm, and 0.64 cm.…”

Section: Uranium Pieces -mentioning

confidence: 99%

“…The dimensions given in Ref. 1 and logbook sketches indicate that the large uranium cylinders were always centered in the cells of the 2x2x2 array designated as the core. For all configurations, the core rests on the bottom reflector and is centered horizontally in the internal void.…”

Section: Description Of Experiments -mentioning

confidence: 99%

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Concrete Reflected Arrays of U(93.2) Metal

Gorham¹,

Bess²,

Briggs³

et al. 2010

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During the period from 1963-1973, experiments involving highly enriched uranium units were performed at the Oak Ridge National Laboratory Critical Experiments Facility to determine various critical configurations of three-dimensional arrays. The experiments formed a four-part series and were reported by several different experimenters; the results of interest for this evaluation are those reported for the fourth experimentation, Critical Three-Dimensional Arrays of Neutron Interacting Units: Part IV, published and performed by D.W. Magnuson (Ref 1). Information is also available in the experimental logbook. a This set of experiments, performed November 13-17 of 1972, utilized subcritical metal units on a split table apparatus to determine critical configurations for 2×2×2 arrangements of highly enriched uranium reflected by concrete. Magnuson manipulated the configuration of several uranium cylinders and blocks within a concrete reflector. The different permutations utilized uranium cylinders of two different heights in various positions in the three dimensional array; certain cases also placed thin uranium blocks on top of the cylinders. The thickness of the surrounding concrete, as well as the inner dimensions of the concrete reflector, was also varied in certain cases. The variations resulted in fourteen different experimental permutations or configurations. All fourteen configurations were judged to be unacceptable for use as criticality benchmark experiments due to apparent large extrapolations to obtain experimental k eff values with no supporting data and large uncertainties in the concrete composition and density data. All experiments were initially evaluated; however only three configurations were evaluated in detail. Configurations 2, 4, 6 and 12 were not evaluated in detail because they are subcritical and Configurations 5, 7, 8, 9, and 10 were also were not evaluated in detail because they were extrapolated or corrected to values greater than beta effective (~0.007) above delayed critical, or prompt critical. The experiments evaluated in detail for this report were Configurations 1, 3, and 11. The experimental report also contains information for HEU-MET-FAST-056. Closely related work has been recorded in HEU-MET-FAST-053, which is an evaluation of a different series of three dimensional array experiments with four different moderator materials. HEU-MET-FAST-023 and HEU-MET-FAST-026 are also related because they utilize the same metal cylinders as these experiments (Ref. 1).

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“…The values given for the D94278 analysis as well as those in the analysis for Requisition No. 684639 generally agree with those calculated from the atom-density composition given in Ref 1…”

supporting

confidence: 84%

Section: Uranium Pieces -mentioning

confidence: 99%

Section: Uranium Pieces -mentioning

confidence: 99%

Section: Uranium Pieces -mentioning

confidence: 99%

Section: Description Of Experiments -mentioning

confidence: 99%

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