Implementation method for reactor LPD and DNBR on-line protection and monitoring

The invention discloses an implementation method for reactor LPD and DNBR on-line protection and monitoring. The method includes the steps that the measured current of self-powered detectors SPND andvarious measured operation parameters of a reactor main coolant system are collected; the collected data is transmitted to an upper calculation unit and a lower calculation unit; the upper calculationunit and the lower calculation unit perform LPD online calculation and DNBR online calculation, wherein the calculation accuracy of the upper calculation unit is higher than that of the lower calculation unit; based on the LDP and DNBR calculation results of the lower calculation unit, LPD and DNBR protection input signals are provided for a reactor protection system to achieve the LPD and DNBR protection function; based on the LDP and DNBR calculation results of the upper calculation unit, the reactor operation status is monitored. By means of the method, the LPD and DNBR distribution of axial sections of each fuel a