BS IEC 61031:2020 pdf download.Nuclear facilities — Instrumentation and control systems — Design, location and application criteria for installed area gamma radiation dose rate monitoring equipment for use during normal operation and anticipated operational occurrences.
5.2 General requirements 5.2.1 General characteristics and lifecycle The design of the area radiation monitor shall meet the requirements of IEC 60532. Furthermore, the additional specific requirements given in IEC 61 031 shall be met. If signals from area radiation monitors are used as inputs to interlock systems or plant and/or reactor safety systems, the design of such monitors shall also meet the appropriate requirements of such systems (for example, in respect to interface requirements, classification, reliability, qualification, etc.). In the selection of the area radiation monitor, consideration shall be given to the range of measurement, temperature, pressure, humidity, electromagnetic interference, vibration, expected total integrated dose and seismic qualification in the areas where the equipment and in particular the detector will be located. Any requirements to extend the normal environmental specifications shall be identified (see IEC 60532). The area radiation monitor performing functions that are important to safety shall comply with the requirements relating to the characteristics and lifecycle of RMSs defined in IEC 62705 and the standards referenced in IEC 62705 (e.g. IEC 61 226).
5.2.2 Safety classification and applicable standards The area radiation monitor shall be classified according to its suitability to implement I&C functions up to a defined category during the system specification phase as shown in IEC 61 51 3:201 1 , 6.2.3. According to the category of the function implemented, the following standards shall be applied: a) System and equipment performing category A functions Any software in the area radiation monitor performing category A function shall be designed and maintained in accordance with IEC 60880. Any HDL-Programmed Device (HPD) in the equipment of the area radiation monitor performing category A function shall be designed and maintained in accordance with IEC 62566. Any hardware in the area radiation monitor performing category A function and including software or HPD shall be designed and maintained in accordance with IEC 60987.
b) System and equipment performing category B or C functions Any software in the area radiation monitor performing category B or C function shall be designed and maintained in accordance with IEC 621 38. Any hardware in the area radiation monitor performing category B function and including software shall be designed and maintained in accordance with IEC 60987. Hardware performing category C function in the area radiation monitor shall be designed, selected and maintained according to the supplier's requirements.BS IEC 61031 pdf download.