Large SGR Control Rod Development Page: 7
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A development program was initiated to design, fabricate and
test an absorber column with a 10 to 12 year lifetime, for use in
the proposed Large Sodium Graphite Reactor (LSGR). The com-
bined shim-safety control rod planned for the LSGR will be a
variation of the Hallam Reactor control rod design with the major
innovation to be the absorber column. Dysprosium oxide in an
annulus formed by an integral tube of Hastelloy-X and a center
graphite filler log was chosen as the primary poison material.
Full scale elevated temperature testing at reactor profile temper-
atures gradients simulated approximately 5 years of column life-
time with no adverse effects observed. A prototypical absorber
column of this design has been incorporated in the SRE-PEP con-
trol rod to gain long term irradiation and operational data to aid
in the development of a full scale prototype combined shim-safety
control rod for the LSGR.
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Dermer, M. D. Large SGR Control Rod Development, report, July 25, 1965; Canoga Park, California. (digital.library.unt.edu/ark:/67531/metadc860824/m1/7/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.