IEEE 60780-323 2016 pdf free download – Nuclear facilities – Electrical equipment important to safety – Qualification.
3.12 equipment important to safety
equipment that is part of a safety group and/or whose malfunction or failure could lead to undue radiation exposure of the site personnel or members of the public. Equipment including:
• those structures, systems and components that prevent anticipated operational occurrences from leading to accident conditions;
• those features that are provided to mitigate the consequences of malfunction or failure of structures, systems and components.
A) For usage consistent with IEC 61226, equipment important to safety are as follows:
– all I&C equipment performing Category A to Category C functions (in accordance with the IEC 61226 categorisation scheme),
– all electrical equipment needed to ensure emergency energy supply to this equipment in case of a loss of normal power supply,
– all electrical equipment needed to ensure ultimate energy supply in case of total loss of on-site power (if selected as design extension condition to be mitigated).
B) For usage consistent with other IEEE documents and a Class 1E categorization; for equipment important to safety, qualification is essential to the following:
– electric equipment and systems that are essential to emergency reactor shutdown, containment isolation, reactor core cooling, and containment and reactor heat removal, or
– electric equipment that are otherwise essential in preventing significant release of radioactive material to the environment. Note 1 to entry: Users of this standard are advised that Class 1E is a functional term.
Equipment and systems are to be classified Class 1E only if they fulfill the functions listed in the definition. Identification of systems or equipment as Class 1E based on anything other than their function is an improper use of the term and should be avoided.
3.13 equipment qualification
The generation and maintenance of evidence to ensure that equipment will operate on demand to meet system performance requirements during normal and abnormal service conditions and postulated design basis events [SOURCE: IAEA Safety Glossary, 2007]
3.14 equipment similarity
demonstration of physical, operational and dynamic equivalency between equipment being qualified and equipment previously qualified
3.15 harsh environment
An environment resulting from that significantly changes as a result of a design basis event, e.g., loss-of-coolant accident (LOCA), high-energy line break (HELB), and main steam line break (MSLB) [SOURCE: IEEE Standards Dictionary Online]
3.16 interfaces
shared boundary between structures, systems and components that includes physical attachments,mounting, auxiliary components, and connectors (electrical and mechanical) to the equipmen.IEEE 60780-323 pdf download.