BS IEC 62765-2 pdf free download
BS IEC 62765-2-2019 pdf free download.Nuclear powers plants – Instrumentation and control important to safety – Management of ageing of sensors and transmitters Part 2: Temperature sensors.
This part of IEC 62765 identifies minimum requirements and applicable practices for correcting and preventing any potential impacts on nuclear power plant (NPP) safety due to the ageing of temperature sensors, such as NPP resistance temperature detectors (RTDs) and thermocouples (TCs). This document provides strategies, technical requirements, and recommended practices for the management of the ageing of temperature sensors important to safety in nuclear power plants (NPPs) to ensure that ageing can be identified and that suitable remedial actions are undertaken as necessary to demonstrate that the safety of the plant will not be impaired. This document is aligned with IEC 62342, which provides guidance on ageing management for instrumentation and control (I&C) systems important to safety in NPPs. IEC 62765 standard series covers pressure transmitters (Part 1 ) and temperature sensors (Part 2). Part 1 covers pressure transmitter (PT), level transmitter (LT) and flow transmitter (FT). Part 2 consists of resistance temperature detector (RTD) and thermocouple (TC) with respect to instrumentation and control (I&C) important to safety. Detector of neutron power (Part 3) will be covered in a separate standard. Interfaces of temperature sensors with processes such as thermowells, seals, sheathes, extension/compensating cables, and connectors are within the scope of this document. Ageing management of temperature sensors used as M&TEs are beyond the scope of this document. Temperature units of this document are in terms of International Temperature Scale-1 990 (ITS- 90), because of consistency with normative references. IAEA SSR-2/1 and SSR-2/2 address the requirements of ageing management in the design, as well as in the operation of the lifetime of the plant.SSG-39 recommends design consideration for ageing management specific to I&C system. The requirements of temperature sensors for industrial and nuclear application in the normative references are indispensable to this document whereas this document focuses on the ageing management of temperature sensors to meet the requirements.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60584-1 :201 3, Thermocouples
– Part 1: EMF specifications and tolerances IEC 60584-3:2007, Thermocouples
– Part 3: Extension and compensating cables – Tolerances and identification system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 adjustment <of a measuring instrument> set of operations carried out on a measuring instrument in order that it provides given indications corresponding to given values of the measurand Note 1 to entry: An adjustment can be carried out during cross-calibration of temperature sensors in the temperature measurement channel. [SOURCE: IEC 60050-31 1 :2001 , 31 1 -03-1 6] 3.2 calibration set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material, and the corresponding values realized by measurement standards [SOURCE: IAEA Safety Glossary, edition 201 6]BS IEC 62765-2 pdf download.
