A small graphite-reflected UO{sub 2} assembly

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Description

An unmoderated, graphite-reflected, critical assembly of UO{sub 2}, enriched to 93.15 wt % in {sup 235}U, is described. The UO{sub 2} pellets (density, 9.71 g/cm{sup 3}) were contained in 253 1.27-cm-diam stainless steel tubes, which, in turn, are close packed in an aluminum container 22.87 cm in diameter and 31.11 cm long. This mockup of a small, potassium-cooled space power reactor, which was under study at Oak Ridge National Laboratory in 1963, provided data for validation of reactor physics methods. Two combinations of top and side reflectors were found to make the assembly critical. In one configuration, the thickness of ... continued below

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8 p.

Creation Information

Mihalczo, J.T. July 1, 1995.

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Description

An unmoderated, graphite-reflected, critical assembly of UO{sub 2}, enriched to 93.15 wt % in {sup 235}U, is described. The UO{sub 2} pellets (density, 9.71 g/cm{sup 3}) were contained in 253 1.27-cm-diam stainless steel tubes, which, in turn, are close packed in an aluminum container 22.87 cm in diameter and 31.11 cm long. This mockup of a small, potassium-cooled space power reactor, which was under study at Oak Ridge National Laboratory in 1963, provided data for validation of reactor physics methods. Two combinations of top and side reflectors were found to make the assembly critical. In one configuration, the thickness of the top and the side reflectors was 12.70 and 19.25 cm respectively; in the other, these dimensions were 5.08 and 24.34 cm. Fission distribution measurements axially through the assembly with the thicker radial reflector and radially through the reflector showed a peak in the reflector 3.5 greater than at the center of the core. The {sup 235}U cadmium ratio measured in the side reflector at the core midplane for the assembly with the 19.25-cm-thick side reflector varied from 1.77 near the core boundary to 2.43 beyond 10 cm into the side reflector.

Physical Description

8 p.

Notes

INIS; OSTI as DE95014600

Source

  • 5. international conference on nuclear criticality safety, Albuquerque, NM (United States), 17-22 Sep 1995

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  • Other: DE95014600
  • Report No.: CONF-9509100--2
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/90207 | External Link
  • Office of Scientific & Technical Information Report Number: 90207
  • Archival Resource Key: ark:/67531/metadc793969

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  • July 1, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 29, 2016, 4:17 p.m.

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Mihalczo, J.T. A small graphite-reflected UO{sub 2} assembly, report, July 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc793969/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.