Reactor plants of ATETS-200 type are a group (ATETS-80, ATETS-150, ATETS-200) of plants of the same kind, developed on the base of an integral reactor with natural coolant circulation, they are autonomous sources of electric energy and heat.

Compactness of the integral reactor, simplicity of the primary circuit and use of a highly efficient steam generator allows natural circulation in all conditions and excludes the use of pumps when providing electric power of up to 200 MW. The ATETS-200 reactor vessel dimensions are not greater, than the dimensions of AST-500 reactor vessel, mastered by the industry.

The investigations confirm the possibility of increasing power up to 250-280 MW.

The plant is notable for the wide variety of passive channels for residual heat removal:

— to each of two heat exchange loops (Fig. l) a channel is connected, which provides

ATETS-200 reactor plant flow diagram

Fig-1

ERHR channel
on the Reactor Upper head

Water inventory in ERHR tank — 150 m3

Cooldown diration (grace period) — 24 hrs

The channel self actuates at the reactor pressure increase up to 21 ‘H MPa

Fig. 2

residual heat removal through SG with natural circulation with heat removal to water tanks, from where water is evaporated to atmosphere;

— independent passive channel of heat removal (Fig.2) is located on the reactor. With its help primary circuit heat is transferred through the wall of the condenser-heat exchanger by natural circulation to a water tank and then it is removed to atmosphere.

Self-actuation of ERHRS channels with emergency protection actuation and, if necessary, of actuations of location system with use of self-actuation devices is provided.