Homogenous Reactor Project Quarterly Progress Report For Period Ending April 30, 1955

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Part I. Experimental Reactors: The effect of prompt-neutron lifetime upon reactor safety was investigated for the HRT. It was found that for a given pressure rise the allowable rate of reactivity addition was relatively insensitive to the average prompt-neutron lifetime, although the rate de creased somewhat with decreasing lifetime for the higher pressure rises. With only source neutrons present and the reactor initially subcritical, the allowable rate was practically independent of the initial value of k£. For a core-pressure rise of 400 psi, the corresponding rate of reactivity addition was about 0.8% per second; for a pressure rise of 4000 … continued below

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xviii, 202 p.

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McDuffie, H. F. & Kelly, D. C. July 14, 1955.

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Part I. Experimental Reactors: The effect of prompt-neutron lifetime upon reactor safety was investigated for the HRT. It was found that for a given pressure rise the allowable rate of reactivity addition was relatively insensitive to the average prompt-neutron lifetime, although the rate de creased somewhat with decreasing lifetime for the higher pressure rises. With only source neutrons present and the reactor initially subcritical, the allowable rate was practically independent of the initial value of k£. For a core-pressure rise of 400 psi, the corresponding rate of reactivity addition was about 0.8% per second; for a pressure rise of 4000 psi, the rate was 2.5 to 3.0% per second. Part II. Thorium Breeder Reactor: An economic study of one-region thorium breeder reactors was completed. Where possible, the process characteristics and cost factors were the same as those used previously in studies of two-region-type reactors. The mini mum-cost reactor is about 12 ft in diameter, operating with 260 g of thorium per liter on a chemical processing cycle of about 450 days. The ratio of U232 to U233 produced is approximately 2 x 10~4 VIM in the minimum-cost one-region system, compared with 4 x 10 5 in the two-region system. The unit cost of power is 0.9 mill/kwhr higher than for the optimum two-region reactor if it is assumed that the fixed costs for both reactor types are equal and that each reactor delivers 125 Mw of electrical power.

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xviii, 202 p.

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Digitized from microopaque cards (7).

"Date Issued Jul 14 1955."

"Date Received by Information and Reports Division (May 13, 1955)."

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  • July 14, 1955

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McDuffie, H. F. & Kelly, D. C. Homogenous Reactor Project Quarterly Progress Report For Period Ending April 30, 1955, report, July 14, 1955; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1956990/: accessed April 20, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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