Steam-generating unit of dual circuit reactor with purge and drain system

A steam generating unit of dual circuit reactor with blowdown and drain system, comprising:

• four identical horizontally arranged steam generators enclosed into a protection tight volume,
• each steam generator having hot and cold headers of a primary circuit with pockets and salt compartment;
• each steam generator being connected to a steam header, feed water supply pipeline, and blowdown lines;
• each steam generator being connected to the blowdown lines from the salt compartment, from a lower part of the steam generator and from said pockets of the primary circuit headers;
• wherein all the blowdown lines of each steam generator are combined into a single blowdown header of a steam generator with further combination into a common blowdown header of the steam generators that is connected to an inlet of a regenerative heat exchanger;
• wherein a discharge line of the regenerative heat exchanger is connected to a blowdown aftercooler;
• and
• a discharge line of the blowdown aftercooler is taken out of the protection tight volume and connected to an active water treatment system;
• and the active water treatment system being equipped with a discharge line of a treated blowdown water of the steam generators connected with at least, one treated blowdown water pump which is further equipped with a pressure line being brought into the protection tight volume and connected to an inlet of an intertubular space of the regenerative heat exchanger;
• wherein an outlet of the intertubular space of the regenerative heat exchanger is connected to the feed water supply pipelines of the steam generators via a common pipeline for the treated blowdown water supply and pipelines for treated blowdown water supply of each steam generator.