Danger Coefficient Measurements Using a Water Boiler Reactor

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The use of a water boiler reactor as a danger coefficient test instrument has been investigated, with emphasis on the testing of reactor materials for neutron absorbing impurities and the testing of uranium for enrichment variations. After calibration of the WBNS course control rod, tests were made on a variety of materials including beryllium, boron trifluoride, iron and steel, natural uranium metal and oxide, and uranium metal of various enrichments. Several experiments were conducted to evaluate the sources and magnitudes of errors in danger coefficient testing. On the basis of the data obtained from sample testing and auxiliary experiments, the ... continued below

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Engholm, B.A. March 1, 1956.

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Description

The use of a water boiler reactor as a danger coefficient test instrument has been investigated, with emphasis on the testing of reactor materials for neutron absorbing impurities and the testing of uranium for enrichment variations. After calibration of the WBNS course control rod, tests were made on a variety of materials including beryllium, boron trifluoride, iron and steel, natural uranium metal and oxide, and uranium metal of various enrichments. Several experiments were conducted to evaluate the sources and magnitudes of errors in danger coefficient testing. On the basis of the data obtained from sample testing and auxiliary experiments, the sensitivity of the WBNS for absorption and enrichment testing was determined, as well as other constants relating to danger coefficient measurements. The Water Boiler Neutron Source has been found to be well suited to danger coefficient testing. Small absorption differences between samples of similar geometry and nuclear propenties can be determined to a standard deviation of 0.002 cm/sup 2/. The danger coefflcient technique using the WBNS compares favorably with other methods of absorption detecting methods, such as the shotgun test or chemical analysis. Enrichment differences between natural uranium samples of only 500 grams can be detected to plus or minus .0008 per cent U/sup 235/ by weight, and between 3 per cent enriched samples to plus or minus 0.0028 per cent U/sup 235/. In enrichment testing relative values can be found to an accuracy equivalent to those obtained from spectrographic analyses. With improvements in the WBNS core arrangement so that larger samples could be handled, and relocation of the glory hole to the flux center of the core, greater sensitivity could be obtained. The WBNS compares favorably to other reactors used for danger coefficient work (auth)

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  • Other Information: Decl. July 1, 1959. Orig. Receipt Date: 31-DEC-59

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  • Report No.: NAA-SR-1510
  • Grant Number: AT-11-1-GEN-8
  • DOI: 10.2172/4237678 | External Link
  • Office of Scientific & Technical Information Report Number: 4237678
  • Archival Resource Key: ark:/67531/metadc1020214

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  • March 1, 1956

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Jan. 22, 2018, 11:25 a.m.

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Engholm, B.A. Danger Coefficient Measurements Using a Water Boiler Reactor, report, March 1, 1956; Canoga Park, California. (digital.library.unt.edu/ark:/67531/metadc1020214/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.