Second Shutdown System

It is a gravity driven injection system of borated water at high pressure, that actuates automatically when the Reactor Protection System detects the failure of the First Shutdown System or in case of LOCA.

The system consists of two tanks of 2 m3 located in the upper part of the containment. A single tank produces the complete shutdown of the reactor.
Each tank has sufficient boron to shut down by itself the reactor within five minutes.