Simulation of the Westinghouse AP1000 Response to SBLOCA Using RELAP/SCDAPSIM

Table 2

Set points for SBLOCA.

Event	Set point
Reactor trip on low pressurizer pressure	12.41 MPa
Reactor trip on low-low pressurizer pressure	11.72 MPa
‘‘S’’ signal on low-low pressurizer pressure	After reactor trip signal
PRHR isolation valve starts to open	After “S” signal
CMTs injection starts	After ‘‘S’’ signal
ACC injection starts on low RCS pressure	4.83 MPa
ADS-1 control valve trip signal	20 s after 67.5% liquid volume fraction in CMT
ADS-2 control valve trip signal	70 s after ADS-1 actuation
ADS-3 control valve trip signal	120 s after ADS-2 actuation
ADS-4A starts to open	20.0% liquid volume fraction in CMT and 120 s after ADS-3 actuation
ADS-4B starts to open	60 s after ADS-4A actuation
IRWST injection starts RCS pressure	RCS pressure less than 0.18 MPa