GETR graphite irradiation capsules: H-4, 5, 6 equivalent N Reactor exposure

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A program for the irradiation of samples-of N-Reactor graphite has been in progress since November 30 1961, in the General Electric Test Reactor (GETR). The basic purpose of the program is to achieve an exposure to the samples equivalent to 20 years of operation of N-Reactor and to relate the physical distortion of the samples to the expected behavior of the N-Reactor moderator stack. Theoretical studies to relate sample exposure in the GETR to exposure in N-Reactor have been underway since the program began. The conversion of exposure depends on three main items: the flux and exposure in the GETR … continued below

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7 p.

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Helm, J. W. March 5, 1964.

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  • Hanford Atomic Products Operation
    Publisher Info: General Electric Co., Richland, WA (United States). Hanford Atomic Products Operation
    Place of Publication: Richland, Washington

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Description

A program for the irradiation of samples-of N-Reactor graphite has been in progress since November 30 1961, in the General Electric Test Reactor (GETR). The basic purpose of the program is to achieve an exposure to the samples equivalent to 20 years of operation of N-Reactor and to relate the physical distortion of the samples to the expected behavior of the N-Reactor moderator stack. Theoretical studies to relate sample exposure in the GETR to exposure in N-Reactor have been underway since the program began. The conversion of exposure depends on three main items: the flux and exposure in the GETR test position; the flux and exposure in the N-Reactor stack; and the relationship of the amount of carbon damage per unit flux in N-Reactor to that in the GETR. To date all three items of the conversion have been based strictly on computer calculations. The first item (the GETR flux) has been calculated as group one, E > 0.18 MeV, of the three-group computation made every reactor cycle by the GETR physics group, This computation is normalized to reactor conditions by comparison of group three, E < 0.17 ev, with measured cobalt-alloy monitors. No direct comparison of group one with monitor materials is made; however, efforts to correlate these are now underway. On this basis, it was estimated that the test samples accumulated exposure at the rate of 4 to 5 years of equivalent N-Reactor exposure per year of test irradiation.

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7 p.

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OSTI as DE94011297; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

Other Information: DN: Declassified

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  • March 5, 1964

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 13, 2024, 1:41 a.m.

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Helm, J. W. GETR graphite irradiation capsules: H-4, 5, 6 equivalent N Reactor exposure, report, March 5, 1964; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1319433/: accessed April 10, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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