Nuclear power plant equipment upgrade program:

Reactor Trip System

Reactor Trip System is used as a technical base while designing new and existing Reactor Trip Systems of WWER type reactors at nuclear power plants. 

The Reactor Trip System is developed based on the digital I&C RadICS platform which utilizes field programmable gate array (FPGA) technology. 

Reactor Trip System performs the following functions:

  • maintains continuous automatic monitoring of current values of reactor process parameters;
  • generates emergency and warning protection signals when the monitored parameters go beyond the established limit values;
  • actuates appropriate commands to the Rod Control Subsystem and other I&C systems of a power unit;
  • if necessary, automatically shuts down the reactor, generating emergency or warning protection commands.

The Reactor Trip System implements the requirements of IEC and IAEA standards for safety-related systems. 

Two independent sets of Reactor Trip System (main and diverse) are developed and manufactured to comply with diversity requirements to ensure common reason failure tolerance.

Each set of Reactor Trip System is three-channel and uses "2 out of 3” voting.

From 2004 to 2015, 31 Reactor Trip Systems (including 16 main and 15 diverse) were designed, manufactured, delivered, and installed at Ukrainian nuclear power plants:

  • Rivne – 8 systems from 2004 to 2007;
  • South-Ukraine – 6 systems from 2004 to 2015;
  • Khmelnitsky – 4 systems from 2004 to 2007;
  • Zaporizhzhia – 13 systems from 2004 to 2013.