Determination of Life-Time of the B$sub 4$C-in-Tubes Control Rod

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The lifetime of a B/sub 4/C-in-tubes'' control rod may be limited by either nuclear worth depreciation or internal gas pressure buildup as helium is formed and released from the B/sub 4/C particles. Nuclear life is enhanced by thin tube walls for any given O.D. of tubing and by high B/sub 4/C density, but the time to failure from gas pressure buildup is increased by the opposite. The optimum B/sub 4/C density and tube wall thickness were calculated for maximum control rod life, using several release fractions of generated helium and a number of allowable cladding stress values. It was estimated … continued below

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22 pages

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Megerth, F. H. July 19, 1961.

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The lifetime of a B/sub 4/C-in-tubes'' control rod may be limited by either nuclear worth depreciation or internal gas pressure buildup as helium is formed and released from the B/sub 4/C particles. Nuclear life is enhanced by thin tube walls for any given O.D. of tubing and by high B/sub 4/C density, but the time to failure from gas pressure buildup is increased by the opposite. The optimum B/sub 4/C density and tube wall thickness were calculated for maximum control rod life, using several release fractions of generated helium and a number of allowable cladding stress values. It was estimated that lifetimes of l0 or more years for B/sub 4/C-in-tubes control systems are achievable through the proper selection of tubing material and B/sub 4/C density values. The B/sub 4/C densities required for maximum lifetimes are in a range that can be obtained by vibratory compaction followed by swaging. (auth)

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22 pages

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Other Information: Orig. Receipt Date: 31-DEC-62

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  • July 19, 1961

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  • Jan. 22, 2018, 7:23 a.m.

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  • Nov. 23, 2024, 2:38 a.m.

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Megerth, F. H. Determination of Life-Time of the B$sub 4$C-in-Tubes Control Rod, report, July 19, 1961; San Jose, California. (https://digital.library.unt.edu/ark:/67531/metadc1056248/: accessed January 21, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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