Lattice Measurements with 36-Element Natural UO sub 2 Fuel in the ZED-2 Hot Loop Facilities: Detailed Lattice Cell Parameters

摘要

Experiments have been performed in the ZED-2 reactor hot loop facilities to determine typical lattice parameters at various positions in the central cell of lattices of 36-element natural UO sub 2 fuel. The measurements were made in an hexagonal lattice at 31 cm pitch using ''air'', heavy water or light water, at approximately 20 deg C and approximately 300 deg C, as coolants. This report describes these experiments and presents the results in terms of detailed relative copper activity distributions, indium-manganese and lutetium-manganese relative activity ratios, the Westcott parameters r and Tsub(eta), initial conversion ratios and fast fission ratios, and Pu-239 - U-235 relative fission product activity ratios. (Atomindex citation 09:399066)