Research Article
Remarks on Consistent Development of Plant Nodalizations: An Example of Application to the ROSA Integral Test Facility
Table 10
Control logic of Test 5-2 [
14].
| 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 | | Generation of SI signal | Primary pressure below 79% of initial value | Opening and closing of the SG relief valves | SG pressures 110%/103% | Initiation of SG secondary-side depressurization by fully opening of the relief valves with auxiliary feedwater | 10 minutes after generation of SI signal | Initiation of enhanced SG secondary-side depressurization by fully opening of safety valves | Primary pressure below 13% of initial value | Initiation of accumulator system | Primary pressure below 29% of initial value |
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