Progress Report on Plutonium Criticality Studies, July 1--December 31, 1975 PDF Download

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Book Description
The objective of this task is the procurement of criticality data for development of technology on nuclear criticality control and safety for design and operation of facilities and equipment in fabrication, processing, and shipment of LMFBR fuels. Criticality experiments were completed for determining the critical mass and volume of fully reflected rectangular parallelepipeds of undermoderated homogeneous assemblies composed of mixed oxides of PuO/sub 2/ and UO/sub 2/ (8.1 wt percent Pu in the oxide). The H/X atomic ratio was 7.33 (H/fissile of 100.6). The uranium was depleted to 0.2 wt percent /sup 235/U and the /sup 240/Pu isotopic content of the plutonium was 11.5 wt percent. A complete description of the fuel and the critical assemblies is given. A summary was prepared on neutron poisons which includes recent experimental data that have been generated on U + Pu solutions containing mixtures of soluble poisons (boron and gadolinium). The summary will be updated as more information is generated. The next planned update will be made on completion of the calculational correlation against the recent experimental data on the mixtures of poisons.