Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/419
Title: Fission gas retention in spherical beryllium oxide based fuel elements for the conceptual aborigine reactor.
Authors: Hanna, GL
Keywords: Fuel elements
Beryllium moderated reactors
Spheres
Fission products
Gas flow
Retention
Issue Date: Jul-1972
Publisher: Australian Atomic Energy Commission
Citation: Hanna, G. L. (1972). Fission gas retention in spherical beryllium oxide based fuel elements for the conceptual aborigine reactor. (AAEC/E230). Lucas Heights, NSW: Australian Atomic Energy Commission.
Abstract: Fission gas release from spherical BeO-based fuel elements designed for the conceptual ABORIGINE reactor and from 200 micron diameter fuel particles of U02-Th02 solid solution has been measured by in-pile sweep capsule testing In the temperature range 600ºC to 1000ºC, Release parameters (R/B ratios) of 10-7 to 10 s were measured on several fuelled spheres, and 10-4 to 10-2 on bare fuel particles. Two spheres with bonded cladding maintained good gas retention at 1000ºC for fast neutron doses (6 x 1020 nvt) which were three times that required of the ABORIGINE fuel element; however, the fission burnup (1.1 percent U + Th) was a factor of nine below the design burnup. It has thus been shown that BeO coatings on fuelled BeO spheres can in principle retain fission gases to the high standard required for ABORIGINE. Further work would be needed, (a) to assess the reliability of the fabrication process, (b) to test to high burnups fuelled spheres designed so that the coating is subjected only to fast neutron damage and which therefore should not crack from burnup effects, (c) to eliminate other possible cracking mechanisms such as thermal stress, and (d) to measure the release from cracked spheres under a range of conditions and thus to determine the allowable cracking rate more accurately.
Gov't Doc #: 457
URI: http://apo.ansto.gov.au/dspace/handle/10238/419
ISBN: 0642994749
Appears in Collections:Scientific and Technical Reports

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