This part 2 of IEC 61559 supplements IEC 61559 to include discharge, environmental, accident, and post-accident monitoring functions that are not within the scope of IEC 61559. It applies to centralized systems having a direct role in the achievement or maintenance of radiation protection in facilities other than nuclear power plants. These systems perform functions such as: – radiation monitoring of plant discharges; – 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. In some facilities, these functions may have greater safety importance than the functions addressed in IEC 61559. This standard applies to the integration of radiation monitoring functions into a centralized system. It will not directly apply to the design and testing of detection and measurement assemblies. Requirements for these assemblies are contained in existing standards. This standard describes the integration of functions including equipment such as those described in IEC 60761-1, IEC 60761-2, IEC 60761-3, IEC 60761-4, and IEC 60761-5 into a plant-wide digital system. The requirements of system-level components (central computer, subsystem computers, operator consoles and interconnections) are discussed. For detection assemblies, processing units and alarm units, this standard contains only the requirements needed to allow connection into the centralized system. The standards referenced above contain the specific requirements for these components. The standard 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 requirements and tests, software performance requirements and tests, environmental characteristic performance requirements and tests, and documentation are considered.