One dimensional Benchmark test of principal fissile nuclides in JENDL-3

As one of the Benchmark tests of JENDL-3, criticality calculations have been performed on 9 small critical Benchmark assemblies for fast reactor, such as JEZEBEL, JEZEBEL-Pu, FLATTOP-Pu, THOR, GODIVA, FLATTOP-25, BIG TEN, JEZEBEL-23, and FLATTOP-23. These assemblies have the characteristics of simple geometry and very high enriched cores consisting of single fissile nuclide such as 233U, 235U and 239Pu. All calculations are performed by one-dimensional Sn code ANISN (S16, P5) with JSSTDL-295 group cross section library. From this benchmark test, following problems are pointed out: (1). inadequacy of δ function energy distribution representation adopted in JENDL-3 at the threshold energy point for the continuum inelastic scattering, (n,2n), (n,3n) (n,4n) and charged particle emitting reaction. (2). 233U data of JENDL-3 reproduces Keff nearly 2.1% over prediction. χ data is suspected to this over prediction. revaluation is requested. (3) as to 235U and 239Pu data, no problem is pointed out. (author)