Recent evaluation for the German Nuclear Data Library KEDAK-3

For the design and optimization of reactors a precise knowledge of the microscopic neutron data is needed. For this purpose new evaluations for a number of important fast reactor materials have been performed at this laboratory. Reevaluations of /sup 238/U and /sup 239/Pu are discussed. To check the quality of the presently evaluated data in reactor physics calculations, their effect on k/sub eff/ for a large variety of critical assemblies is studied. Calculation shows that with the evaluated data for /sup 235/U, /sup 238/U, /sup 239/Pu, /sup 240/Pu, /sup 241/Pu and /sup 242/Pu the value of k/sub eff/ for a large number of critical assemblies can be reasonably well reproduced without any adjustment of the data. 1 table, 6 figures. (auth)