BS IEC 62765-1-2015 pdf free download – Nuclear powers plants — Instrumentation and control important to safety — Management of ageing of sensors and transmitters Part 1: Pressure transmitters.
This part of IEC 62765 provides strategies，technical requirements, and recommendedpractices for the management of ageing to ensure that ageing of pressure transmittersimportant to safety in nuclear power plants (NPPs) can be identified and that suitableremedial actions are undertaken as necessary to demonstrate that the safety of the plant willnot be impaired. This standard is aligned with the IEC 62342 standards，which providesguidance on ageing management for l&C systems important to safety in NPPs.This standard,EC 62765-1, is the first part for pressure transmitters in the IEC 62765 sensor and transmitterseries for pressure, temperature, neutron and other sensors.
This standard deals with analogue electronic pressure transmitters，which have an electricalsignal output that is a function of pressure applied on the sensing part，and which areincluded in l&C systems important to safety in accordance with lAEA terminology.
Any software used for data acquisition，data qualification，or data analysis for transmittertesting or condition monitoring system for pressure transmitter is classified according toIEC 62138 depending on its functionality as specified in lEC 61226.The qualification of thesoftware for the digital data processing is beyond the scope of this standard.
Additional condition monitoring system for ageing management of the pressure transmitters isclassified according to lEC 61226 with respect to its functionality. If classified,the softwareinstalled in the monitoring system complies with lEC 62138 for its B or C categorised function.
Regarding environmental qualification, the requirements of lEC 60780 apply. For assessingthe performance of transmitters in the safety system instrument channel，the IEC 62385methods,IEC 61888 requirements and IEC 60671 surveillance testing requirements apply.
Pressure measurements may be used for the measurement of other parameters that can berelated to pressure，e.g.,level or flow. Interfaces which include sensing lines,condensingpots,and primary (e.g., flow) elements between process and transmitters are within the scopeof this standard.
2Normative references
The following documents, in whole or in part, are normatively referenced in this document andare indispensable for its application. For dated references, only the edition cited applies. Forundated’references,the latest edition of the referenced document (including anyamendments) applies.
IEC 60671,Nuclear power plants – Instrumentation and control systems important to safety -surveillance testing
IEC 60780,Nuclear power plants – Electrical equipment of the safety system – Qualification
IEC 61226，Nuclear power plants – Instrumentation and control important to safety -Classification of instrumentation and control functions
IEC 62138,Nuclear power plants – Instrumentation and control important for safety -Software aspects for computer-based systems performing category B or C functions
IEC 62342,Nuclear power plants – lnstrumentation and control systems important to safety -Management of ageing
IEC 62385:2007，Nuclear power plants – Instrumentation and control important to safety -Methods for assessing the performance of safety system instrument channels
IEC 62465:2010，Nuclear power plants – Instrumentation and control important to safety -Management of ageing of electrical cabling systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
accuracy of measurement
closeness of the agreement between the result of a measurement and the conventionally truevalue of the measurand
Note 1 to entry: The parameter may be, for example, a standard deviation (or a given multiple of it), or the half-width of an interval having a stated level of confidence.
3.2
ageing assessment
evaluation of appropriate information for determining the effects of ageing on the current andfuture ability of systems,structures,and components to function within acceptance criteria inall operating conditions (e.g., in normal conditions and after design basis events)
[SoURCE:IEC 62465:2010,3.2]
3.3
ageing management
engineering,operations and maintenance actions to control within acceptable limits ageingdegradation of structures, systems or components.
[SOURCE:IAEA Safety Glossary，2007 edition]BS IEC 62765-1 pdf download.