Microcomputer - Based Fault - Tolerant Process Control System for 540 MWe PHWRs TAPS - 3 & 4

摘要

The TAPS 4 DPHS-PCS system was commissioned in August 2004. The system was successfully used during hot-conditioning and pressurizer performance tests. The system has performed exceedingly well during several stages of power operation of TAPS 4. During load throwoff tests carried out at 50 percent and 90 percent full power, creating simultaneous severe transients in all the processes, DPHS-PCS regulated all the six processes very well. The documents submitted to AERB by TAPS 4 station authorities states that, the performance of DPHS-PCS has been very good. Primary coolant pressure has been maintained well within the small range of 100 kg/sq.cm. during various transients like turbine trips, load rejection and reactor trips. With the system experiencing several transients, it has never shown any indication of tending towards trip set points of PHT low or high pressure. The TAPS 3 DPHS-PCS was also successfully commissioned in November 2005.