ELECTRIC EQUIPMENT PACKAGE OF A CONTROL AND PROTECTION SYSTEM

The KE SUZ electric equipment package of a control and protection system combines functions of SGIU and ARM-I and is an executive part of NPP units’ SUZ.

Functions of KE SUZ:

• SGIU functions - automatically controlling movement of control rods (OR) of SUZ by protection signals, remotely controlling movement of control rods by commands from an operator, ARM-I, indicating current position and state of control rods in MCR and BCR;
• ARM-I functions – automatically controlling RF power and pressure in a main steam collector;
• guaranteed powering for drives of SUZ and equipment of KE SUZ;
• registering and displaying parameters, their changes and faults;
• transferring information to adjacent systems.

Composition of KE SUZ:

• an executive part of emergency protection, consisting of two redundant diverse sets;
• an SGIU control rod control system;
• an ARM-I automatic reactor power controller;
• a power supply subsystem;
• information and diagnostic equipment.

System advantages:

• exclusion of false AZ triggering due to use of three independent channels of emergency commands using “unconditional” logic;
• use of diversity principle (protection modules, intermediate relays, and power contactors of the first and second set of an AZ-PZ executive part are produced using diverse components);
• possibility of online switching of any drive and position sensor of control rods to reserve channels of power control and position monitoring;
• automatic support of physical experiments.

Safety class – 2.
Safety category – А.

Implementation facilities:

Kola NPP, unit 4