Safety systems structure

SAFETY SYSTEMS STRUCTURE

Safety systems are designed resistant to failures, including to common cause ones, and are able to perform their functions in case of loss of power supply. To achieve that, the following requirements are applied:

each safety system consists of two completely independent subsystems. Each subsystem consists of two channels, each of which is able to perform the functions of the whole system;
number of system trains is selected and based on the implementation of the single failure principle;
each safety function is independently ensured by an active and a passive system, each of which is able to perform assigned safety functions;
spatial separation as well as constructive protection is ensured for safety systems trains;
safety control systems are designed in such a way that the failure of the system provokes actions aimed at ensuring safety;
to minimize operator errors, automatic systems for initiation of protective actions are used, while control actions are blocked if disturbing implementation of safety functions;
active safety systems are provided with power supply from independent sources (diesel generators), meeting the requirements for supporting safety systems.

More details about the safety systems are presented in the video below.

Source: Nuclear Regulatory Agency

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