Institute of Nuclear Physics, Tashkent, Uzbekistan
Now in the
WWR-CM reactor (Tashkent) the IRT-3M type Fuel Assemblies (FA) with UO2-Al
fuel of 36% enrichment are used. Density of uranium in the Fuel Elements (FE)
meats – 2.5 g/cm3.
Thickness of meats – 0.5 mm. The WWR-CM reactor conversion on use of these FA
was begun in August, 1998 and was completed in February, 1999. According to the
Russian RERTR program in the WWR-CM reactor the lifetime testing of four IRT-4M
type FA (two 8-tube and two 6-tube) with LEU (19.7%) UO2-Al fuel
will be carried out. These FA were fabricated by JSC “Novosibirsk Chemical
Concentrates Plant” (NZHK). Uranium density in the FE meats – 3.0 g/cm3. FE cladding
material in two FA is aluminum alloy CAB-1, and in two others – alloy
AMг2. Neutronic and thermal-hydraulic calculations in a substantiation of
safety of the IRT-4M type FA testing were performed. Results of calculations
are presented. The IRT-4M type FA testing will be begun in October, 2000.