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Table 3
Safety signals (conservative delays for actuation).
| Signal | Trigger(s) | Delay (s) |
|---|---|---|
| Reactor protection | High containment pressure or low pressurizer pressure | 0.9 |
| Reactor scram | Reactor protection or low pump speed or high pressurizer pressure | 1 |
| Coolant pump stop | Reactor protection or reactor scram or ADS first stage opening or low pressurizer level | 3 |
| Feed and steam lines isolation | Reactor protection or turbine trip | 0.15 |
| Core makeup tank injection | Reactor protection or low pressurizer level | 2 |
| Emergency condensers actuation | SG high pressure or passive primary cooling actuation | 0.5 |
| Passive primary cooling actuation | CMT injection or high pressurizer level | 4 |
| ADS first stage opening | CMT injection and low level in both CMTs | 20 |
| ADS second stage opening | ADS first stage opening | 70 |
| ADS final stage opening | ADS second stage opening and very low level in both CMTs | 250 |
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