Passive safety system of a super fast reactor

Passive safety systems of a Super Fast Reactor are studied. The passive safety systems consist of isolation
condenser (IC), automatic depressurization system (ADS), core make-up tank (CMT), gravity driven
cooling system (GDCS), and passive containment cooling system (PCCS). Two accidents of total loss of
feedwater flow and 100% cold-leg break large LOCA are analyzed by using the passive systems and the
criteria of maximum cladding surface temperature (MCST) and maximum core pressure are satisfied.
The isolation condenser can be used for mitigation of the accident of total loss of feedwater flow at both
supercritical and subcritical pressures. The ADS is used for depressurization leading to a loss of coolant
during line switching to operation of the isolation condenser at subcritical pressure. Use of CMT during
line switching recovers the lost coolant. In case of large LOCA, GDCS can be used for core reflooding.
Coolant vaporization in the core released to containment through the break is condensed by passive
containment cooling system. The condensate flows to the GDCS pool by gravity force. The maximum
cladding surface temperature (MCST) of the accident satisfies the criterion.