The SUA TPKV system to control emergency “Coolant leak from a primary circuit to a secondary one with the equivalent section Dy 100” is intended to diagnose leaks from a primary circuit to a secondary one of NPP unit, identify emergency steam generators, and automate their localization algorithm.

Functions of SUA TPKV:

• measuring direct steam radioactivity in steam generators;
• receiving and primarily processing analog and discrete signals from adjacent systems (normal operation systems, safety control systems, reactor trip systems, MCR);
• carrying out calculation and logical operations in accordance with an emergency control algorithm approved by the regulator in the nuclear power engineering;
• forming and delivering SNE, USB actuator control commands (signals of switching on, prohibition of switching on);
• signaling on system operation in control rooms;
• transmitting data on technological parameter values, equipment state, and self-diagnostics results into IVS.

Composition of SUA TPKV:

• four data acquiring and processing devices based on industrial controllers of MSKU series;
• LAN switchboards, an engineering-diagnostic station, and a remote diagnostic station based on PS5140 workstations.

System dvantages:

• decrease of quantity of manual operations fulfilled by operating personnel and minimization of possible personnel’s wrong actions in case of emergency;
• reliable isolation of a damaged steam generator;
• elimination of possibility of steam-release devices operation of a faulty steam generator on steam-water mixture and water, avoidance of release of primary circuit radioactive coolant to the environment;
• reliability of measurement results due to use of three detection units for each steam generator;
• possibility of autonomous check of functioning by means of signal simulation on inputs of accident control algorithms with displaying a checking process on a block diagram of a checked algorithm;
• possibility of integration of SUA TPKV and USBT.

Safety class – 3.
Safety category – В.

Implementation facilities:

• Zaporizhzhya NPP, units 1, 2
• Khmelnitsky NPP, unit 2
• Rivne NPP, unit 4