IEC 61504:2017 pdf download

IEC 61504:2017 pdf download.Nuclear facilities – Instrumentation and control systems important to safety
1 Scope
This document supplements IEC 61 559-1 to include radiation monitoring functions important to safety that are not within the scope of IEC 61 559-1 . It applies to centralized systems having a direct role in the achievement or maintenance of radiation protection in nuclear facilities. These systems perform functions such as: • radiation protection of plant discharge; • interlock of control functions to prevent or to mitigate accidental release of radioactive material; • radiation and environmental monitoring functions to support monitoring of and response to accidents; • provide information to process control or safety systems for use in control or interlock functions. This document defines the communication criteria to link distributed radiation monitoring equipment in the facility, integrates data processing, storage, optimization, and correlation of data flow and displays, and provides criteria for the interface between monitors of different safety classes. It will not directly apply to the design and testing of detection and measurement assemblies except as necessary to define the interface with the central computer. Requirements for these assemblies are contained in existing standards. This document describes the integration of functions including equipment such as those described in IEC 60761 -1 , IEC 60761 -2, IEC 60761 -3, IEC 60761 -4, IEC 60761 -5, IEC 60768, IEC 60861 , IEC 6091 0, IEC 60951 -1 IEC 60951 -2, IEC 60951 -3, IEC 60951 -4, IEC 60951 -5, IEC 61 031 , IEC 61 250, IEC 62302 and IEC 62303, into a centralized system. The requirements of system-level components (central computer, subsystem computers, operator consoles, and interconnections) are discussed. For detector assemblies, processing assemblies and alarm assemblies, this document contains only the requirements needed to allow connection into the central computer. The standards referenced above contain the specific requirements for these components.This document identifies requirements pertinent to the integration of the above functions into a centralized system. Requirements for general and design characteristics, electrical performance requirements and tests, mechanical performance and tests, software performance requirements and tests, environmental characteristics performance requirements and tests and documentation are considered by referring to IEC 62705. Certain complete centralized systems for radiation monitoring may be entirely implemented with direct-connected analogue/relay technology. This document does not apply to such systems.
4 Design requirements
4.1 General 4.1.1 Background Nuclear facility instrumentation and control systems such as the safety system, integrated control system, post accident monitoring system, and radiation monitoring system (RMS) are designed to provide the plant operator with timely information as well as control functions to be used during various conditions in facility including normal, anticipated operational occurrence, and accident conditions. IEC 61 559-1 discusses the types of monitoring provided by the centralized system for continuous monitoring of radiation in nuclear facilities. The scope of this document includes the following RMS functions: • The initiation of control and protection functions to support normal operation of systems, to respond to anticipated operational occurrences, and to prevent or mitigate releases during and following accidents. • The provision of information to control and protection systems for interlock or activation functions. • The storage of relevant data for the analysis of normal, abnormal, or accident conditions, their initiation and their sequence. • The provision of information to the station data processing and display system on essential alarms and information for use in the control room, and possibly in the ERC (emergency response centre). • The provision of information during accident conditions, the RMS provides information to the operator to assist in the evaluation of potential releases to the environment, impact on personnel, or equipment performance. • The provision of information during and following an accident, the RMS provides information to assist the operator in determining the type of accident, evaluate the potential releases to the environment, and initiate appropriate emergency procedures. • The provision of information during and following an accident, the RMS provides release information to emergency response personnel.