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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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