Nuclear reactors. Use of the protection system for non-safety purposes

This document specifies requirements and guidelines for protection systems in nuclear reactors that serve non-safety functions. It addresses the design, operation, and maintenance of such systems to ensure they operate reliably without interfering with safety-related systems. The scope includes defining the boundaries between safety and non-safety protection mechanisms, ensuring clear separation of functions, and establishing criteria for reliability and availability specific to non-essential protective roles. It outlines the necessary technical measures to prevent unintended activation or failure of these systems during normal operation or fault conditions. The content covers aspects related to system architecture, component selection, testing procedures, and interface requirements. By providing a structured framework, the document helps facilities maintain operational integrity while avoiding unnecessary impact on safety-critical components. It serves as a reference for engineers and technical personnel involved in the development and implementation of reactor protection systems with non-safety objectives.