Remarks on Consistent Development of Plant Nodalizations: An Example of Application to the ROSA Integral Test Facility

Table 2

Control logic of Test 6-1 [7].

Event	Condition
Break	Time zero
Generation of scram signal	Primary pressure 84% of initial value
PZR heater off	Generation of scram signal or PZR liquid level below 2.3 m
Initiation of core power decay curve simulation
Initiation of primary coolant pump coastdown
Turbine trip (closure of stop valve)	Generation of scram signal
Closure of main steam isolation valve
Termination of main feedwater
Opening and closing of the SG relief valves	SG pressures 110%/103%
Generation of SI signal	Primary pressure below 79% of initial value
Initiation of auxiliary feedwater	Generation of SI signal
Initiation of SG secondary-side depressurization as accident management (AM) action by fully opening relief valves	Core exit temperature reaches 623 K
Initiation of accumulator system	Primary pressure below 29% of initial value
Initiation of LPSI system	LP pressure below 8% of initial value