Core monitoring methods, including relaxation of thresholds, and related programs, supports and reactors

摘要

The present invention relates to a method of monitoring a nuclear reactor containing a core where a fuel assembly is unloaded, each assembly comprising a nuclear fuel rod comprising a nuclear fuel pellet and a cladding surrounding the pellet. The method is: ^-Determining (100) at least one operating time limit (T ^FPPI ) for operation at reduced power of the nuclear reactor to prevent bursting of at least one cladding; Operating 102 the reactor with reduced power for a real time that is strictly less than the time limit (T ^FPPI ); And ^{-104 relaxing} the at least one protection threshold of the nuclear power plant as a function of the difference between the time limit (T ^FPPI ) and the actual time.