Set of benchmark experiments on slit shielding compositions

The paper is based on the results of the ISTC project # 180 that has recent ly been completed. The aim of the project was the development of methodical , hardware and design basis to carry out computational and experimental res earch on non-uniform shieldings of thermonuclear reactors. As a result a se t of benchmark experiments were created. On their basis verification of the domestic and foreign computational codes with the nuclear data estimated w as realized. For these purposes the iron hollow slits shielding composition s irradiated with 14.8 MeV energy neutrons were studied. The experimental i nstallations allowed research of the shielding compositions with the follow ing characteristics: a solid structure, a structure with one slit of a cent ral symmetry, and the structures with asymmetric slits and with two slits. The thickness of shielding compositions in this research was 500 mm. The re sults of experiments were compared to the results of calculations by means of the MCNP-4a and PRIZMA computing codes with use of the FENDL-1.1, FENDL- 2, JENDL-3.2 and BAS-78 libraries of nuclear data. The results of compariso n made it possible to obtain the recommendations for use of these nuclear d ata. (C) 2001 Elsevier Science B.V. All rights reserved.