The reactor period doubling time is an important monitoring parameter in reactor control,as it directly reflects the rate of change of reactor power level.It is used to determine whether the reactor is in a safe and controllable state.Neutron measurement in reactor source range uses pulse counting rate to characterize neutron fluence rate and power level,and the calculation of corresponding reactor doubling period is complicated.A digital real-time algorithm based on multi-point fitting with minimum error is proposed using digitalization techniques.This algorithm is implemented in field programmable gate array(FPGA)hardware,and functional and performance tests are conducted.The test results show that the FPGA using this algorithm can accurately output the calculated reactor period doubling time within the reactor protection threshold of±3 0s,as the triggering signals for the safety protection system.This reactor period doubling time algorithm is suitable for real-time monitoring of power changes in the source range neutron measurement system,ensuring safety and controllability during startup phase.
Source range neutron measurementReactor doubling periodField programmable gate array(FPGA)
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