Intercomparison of Calculations made for RBEC-M Burn-up Cycle Benchmark. Annex IV

The RBEC 900 MW(th) reactor facility was proposed for a burn-up cycle benchmark. The geometry of the calculation model for the RBEC-M reactor is shown. The reactor operates in an open fuel cycle using reprocessed fuel from light-water reactors having a low level of decay heat power. Three different depletion problems are specified for the benchmark as follows: Burn-up cycle consists of 1800 effective full-power days (mode 1); Burn-up cycle consists of 900 effective full-power days (mode 2); Fuel burn-up campaign consists of six partial burn-up cycles of 300 effective fullpower days each. The reactor is shut down for refuelling for 60 days. During refuelling, 1/6 part of the mass of the fuel and fission products in the core and blanket zones is removed, and 'fresh' (i.e., corresponding to the beginning of the cycle) fuel composition is added (mode 3)