Presented at the International Atomic Energy Agencysponsored Seminar on the Physics of Fast and Intermediate Reactors. Vienna, August 3-11, 196l. A feedback model, was developed to account for resonant instabilities in the Mark II core. In this model, the prompt positive power coefficient effect is ascribed to fuel rod bowing and the delayed negative power coefficient effect to thermally lnduced motions in the lower shield plate. Since this model is supported by observations, it is concluded that the instability of Mark II is chiefly due to lack of radial coupling between fuel rods. (D.L.C.)
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Presented at the International Atomic Energy Agencysponsored Seminar on the Physics of Fast and Intermediate Reactors. Vienna, August 3-11, 196l. A feedback model, was developed to account for resonant instabilities in the Mark II core. In this model, the prompt positive power coefficient effect is ascribed to fuel rod bowing and the delayed negative power coefficient effect to thermally lnduced motions in the lower shield plate. Since this model is supported by observations, it is concluded that the instability of Mark II is chiefly due to lack of radial coupling between fuel rods. (D.L.C.)
Other Information: Presented at the International Atomic Energy Agency-sponsored Seminar on the Physics of Fast and Intermediate Reactors, Vienna, August 3-11, 1961. Orig. Receipt Date: 31-DEC-62
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Smith, R. R.; Matlock, R. G.; McGinnis, F. D.; Novick, M. & Thalgott, F. W.A Mechanism Explaining the Instability of EBR-I, Mark III,
report,
September 1, 1961;
Argonne, Illinois.
(https://digital.library.unt.edu/ark:/67531/metadc1060944/:
accessed February 14, 2026),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
