IEC 61225 pdf download

IEC 61225 pdf download Nuclear power plants – Instrumentation and control systems important to safety – Requirements for electrical supplies
1 scope
This International Standard specifies the performance and the functional characteristics of theelectrical supply systems required for the instrumentation and control (1&C) systems importantto safety of a nuclear power plant. Guidance is also given on the possible use of thesesupplies for other l&C systems.
These supplies should be fed from primary sources of suitable redundancy and reliability, sothat the safety and functional objectives of the l&C system can be adequately achieved.
This standard defines the methods of application of IAEA Safety Guide NS-G-1.3.
The specific design requirements for the components of the l&C power supply system arecovered by lEC standards and standards listed in the references and are otherwise outsidethe scope of this standard.
The scope of the l&C power supply system covered by this standard does not apply tosupplies to certain equipment within an l&C system,which may need specific and specialquality or reliability of power supplies,such as closer tolerances of frequency or voltage or ofinterruption time for loss of supply shorter than the period required by the normal tolerancesof EC standards relevant to power plants.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60038:2002,IEC standard voltages
IEC 60146-2:1999,Semiconductor converters – Part 2: Self-commutated semiconductorconverters including direct d.c. converters
IEC 60686:198o，Stabilized power supplies, a.c. output
IEC 60709,Nuclear power plants – Instrumentation and control systems important to safety -separation
IEC 60780:1998,Nuclear power plants – Electrical equipment of the safety system -Qualification
IEC 60880,Software for computers in the safety of nuclear power plants
IEC 61000-4，Electromagnetic compatibility (EMC) – Part 4: Testing and measurementtechniques
IEC 61226, Nuclear power plants – lnstrumentation and control systems important to safety -Classification of instrumentation and control functions
IEC 61513，Nuclear power plants – Instrumentation and control for systems important tosafety – General requirements for systems
IEC 62138,Nuclear power plants – lnstrumentation and control systems important to safety -Software aspects for computer-based systems performing category B or C functions
IAEA Safety Guide NS-G-1.3: Instrumentation and control systems important to safety innuclear power plants
3Definitions
For the purposes of this document, the following definitions apply. Other terms not definedbelow are defined in lAEA Safety Guide NS-G-1.3.
3.1
item important to safety
item that is part of a safety group and/or whose malfunction or failure could lead to radiationexposure of the site personnel or members of the public
[Derived from lAEA Safety Guide NS-G-1.3]
3.2
safety system
system important to safety,provided to ensure the safe shutdown of the reactor or residualheat removal from the core, or to limit the consequences of anticipated operationaloccurrences and design basis accidents
[lAEA Safety Guide NS-G-1.3]
3.3
safety-related l&C system
l&C system important to safety which is not part of a safety system[IAEA Safety Guide NS-G-1.3]