METHODOLOGY OF THE ON-LINE FUEL MANAGEMENT OF PEBBLE BED HIGH TEMPERATURE REACTORS INCLUDING FOLLOW AND PREDICTION METHODS

摘要

The on-line fuel management is an essential feature of the pebble-bed high-temperature reactors (PB-HTRs), which is strongly coupled with the normal operation of the reactor. For the purpose of on-line analysis of the continuous shuffling scheme of numerous fuel pebbles, there are two kinds of calculations necessary for the PB-HTRs, i.e. the on-line follow calculations and prediction calculations. The keys of on-line follow calculations are the decoupling of pebble flow and steady-state neutronics calculations and the discretization of core layout and operation history. Based on the core status at a certain moment, a series of prediction calculations are implemented, and the best estimate of future operation scheme is made by polynomial interpolations. Both calculations are carried out by using the VSOP code system, and verified by the actual operation data of the HTR-10.