FUEL ELEMENT DEVELOPMENT PROGRAM FOR THE PEBBLE BED REACTOR. Phase II Summary Report, November 1, 1959 to October 31, 1960

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Coatings on the fuel element surface and coatings on individual fuel particles are being investigated for retaining fission products in fuel for the Pebble Bed Reacter. Ten fuel element specimens with surface coatings were subjected to varying amounts of high level irradiation. Cracks or pinholes were found in 6 of the coatings. Evidence indicated that the graphite matrix contributed to most of the failures. Release factors of the order of 10/sup -9/ for the Si--SiC coating under high-level irradiation existed for a period of about one month, however. The pyrolytic carbon coating showed some promise as a fission product barrier ... continued below

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Pages: 146

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Creator: Unknown. October 31, 1961.

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Description

Coatings on the fuel element surface and coatings on individual fuel particles are being investigated for retaining fission products in fuel for the Pebble Bed Reacter. Ten fuel element specimens with surface coatings were subjected to varying amounts of high level irradiation. Cracks or pinholes were found in 6 of the coatings. Evidence indicated that the graphite matrix contributed to most of the failures. Release factors of the order of 10/sup -9/ for the Si--SiC coating under high-level irradiation existed for a period of about one month, however. The pyrolytic carbon coating showed some promise as a fission product barrier in several neutron activation tests. Fourteen batches of UO/sub 2/ particles were coated with A1/sub 2/O/sub 3/ by the vapor deposition process. Tests showed that this coating is an excellent barrier to fission products. In pyrolytic carbon-coated UC/sub 2/ particles there is no temperature limitation due to reaction between the particle coating and the graphite matrix. (M.C.G.)

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Pages: 146

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  • Other Information: Orig. Receipt Date: 31-DEC-61

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  • Report No.: NYO-9062
  • Grant Number: AT(30-1)-2378
  • DOI: 10.2172/4841178 | External Link
  • Office of Scientific & Technical Information Report Number: 4841178
  • Archival Resource Key: ark:/67531/metadc1052470

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  • October 31, 1961

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 25, 2018, 4:25 p.m.

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FUEL ELEMENT DEVELOPMENT PROGRAM FOR THE PEBBLE BED REACTOR. Phase II Summary Report, November 1, 1959 to October 31, 1960, report, October 31, 1961; United States. (digital.library.unt.edu/ark:/67531/metadc1052470/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.