The MKER-1000 reactor unit incorporates as follows:

  • a boling-water graphite-moderated channel-type reactor;

  • horizontal steam separators (8);

  • header blocks (32);

  • downcomers;

  • water service lines;

  • steam-and water lines;

  • reactor unit servicing systems.

The reactor unit process schematic circuit is multi-loop, and it incorporates 16 independent circulation circuits by water (32 circulation loops).

Each circulation circuit consists of a steam separator (one for two circulation circuits), two downcomers with header blocks, steam-and-water and water service lines, and fuel channels.

One header block is installed in the bottom part of each downcomer. Such header block incorporates an injector to intensify the natural coolant circulation, and a distribution header. Water lines of respective fuel channels are fed into this distribution collector.

Passing through the fuel channels, some part of the water evaporates and arrives at the steam separators via steam-and-water lines. The saturated steam is then directed to the turbine via the discharge steam line, while the injector-intensified circulation water is returned via water lines back into the fuel channels.

The discharge lines from four steam separators join into two steam collectors outside the containment. The main steam lines start at the two steam collectors (two for each collector) and deliver steam to the turbine.

Fast-acting isolation valves (FAIV) are installed on each of the discharge steam lines, both inside and outside the containment, at the places where it is penetrated by those lines. Should there be a loss of tightness in any of the circulation loops or steam lines outside the containment, the FAIVís will close automatically. Besides, each steam line has two main safety valves (MSV) and one fast-acting reducing station (FARS).

After having been spent in the turbine, the steam is condensed in the condensors to be cooled by the cirulating water. The condensate then arrives, via the turbine recovery system with 100% purification, at the high-pressure (1,2 МPa) deaerator, wherefrom it is fed by the feedwater pumps, via the high-pressure reheater (HPR), to the reactor unit circulation loop downcomer header blocks.

The process of electrical and thermal energy generation is provided for by the normal operation systems (main steam system; feedwater system; blowdown and cooldown system; cooling circuit for integrated monitoring, control and protection system (IMCPS) channels; reactor unit gas circuit; spent fuel pool cooling system; etc.).

The distinguishing feature providing for a reliable operation of the MKER-1000 unit is the use of equipment which has been mastered by the domestic industry, and having a long-standing positive operational record.

At a thermal power of 3,000 MW the unit has an installed electric capacity of 1,000 MW, and it supplies up to 130 MW of thermal energy to its consumers. It is anticipated that the turbine to be used will be the Russian K-1000-6,1/3000 having a rotation speed of 3,000 rpm and an AC generator of the TZV-1100-2UZ type with a unit capacity of 1,100 MW.

The defence-in-depth concept is realized through equipping the power unit with safety systems ensuring the emergency reactor shutdown and its maintaining in subcritical state as well as the emergency heat removal and retaining of radioactive substances within the prescribed boundaries.

The protective safety systems (IMCPS, liquid emergency protection (LEP), ECCS, passive cooldown system, protection system against overpressure in both the circulation circuit and reactor space) are designed with a max use of a passive action mechanism, and all of them are located inside the tight containment.