Abstract
The objectives of this thesis are to analyze the startup tests of loss of feedwater heater and feedwater pump trip transients by using Lungmen TRACE/PARCS models, and to perform the counterpart calculations against the results from the GE analyses for Lungmen startup test. The initial conditions of Lungmen TRACE/PARCS models are BOC, 100% power and 100% flow. The purpose of loss of feedwater heater startup test is to demonstrate acceptable plant response and associated assumptions used for this transient. When feedwater temperature drops approximately 37�aC, the feedwater control system triggers RIP runback and SCRRI immediately. RIP runback can reduce core inlet flow, which leads to the void in core increase and void reactivity decrease. SCRRI reduces the core temperature which increases the Doppler reactivity. Two mechanisms, RIP runback and SCRRI, reduce the power without reactor scram successfully. The purpose of feedwater pump trip test are to show the capability of the feedwater pump to support continuing operation following the trip of one operating feedwater pump plus the MDRFP initiated automatically and to ensure the feedwater control system can maintain the water level between L3 and L8. Upon detection of the feedwater pump trip, a MDRFP actuates and the RIPs are runback. RIP runback is to reduce the reactor power and mitigate the steam consumption. Then TDRFP and MDRFP can provide enough feedwater to maintain the water level above L3 without reactor scram. In conclusion, Lungmen TRACE/PARCS model can simulate the startup tests of feedwater system successfully and have ability to perform the counterpart calculations against the results from the GE analyses. Besides, the SNAP animation model can show three dimensional visualized results of different core parameters. After the commercial operation of Lungmen power plant, Lungmen TRACE/PARCS model would be verified.