Connection of safety valves of nuclear power plant steam generator secondary circuit

A common collector is formed, connecting all the branch routes fitted with check flap valves and controllable valves and attached to the blowdown routes of each steam generator. The common collector is attached to the inlet of the safety valve system. The outlet of this safety valve system is connected via a connecting branch to the outlet of the pressurizer safety valve system. The outlets of the pressurizer safety valves open to the pressurizer relief tank. The whole is accommodated in the containment, which ensures that no radioactivity leaks into air during a steam generator accidents. The outlets of the separately controlled safety valves at the attachment branches as well as of the safety valve system of the common collector, reach below the water level of the tank; water is thus cooled at the saturation limit whereby formation of steam by expansion inside the containment is prevented. (M.D.). 1 fig