SAFETY P R A C TIC E S - gnssn - International Atomic Energy Agency

This publication is no longer validPlease see http://www-ns.iaea.org/standards/(5) Is the switching arrangement suitable for the load requirements, i.e. are statictransfer switches necessary?(6) Is there a backup AC source to allow inverter maintenance?3.4.8. Cables and busesBasis for acceptanceSafety Guide 50-SG-D7, paras 552-558.Assessment questions(1) Are the conductors of the cables properly sized to accommodate the loaddemands, voltage drops and derating required as the result of cable installationrequirements?(2) Have the cables been adequately derated with respect to installation in raceways,fire stops, fire retardant coatings, etc.?(3) Are the selected circuit protective devices able to protect the cable againstoverheating during steady state load, overloads and short circuits?(4) Has the independence between redundant divisions of the EPS been maintainedwith the cable installations?(5) Are the cables sufficiently fire retardant to prevent propagation of fires?(6) Have cables been suitably qualified in areas with harsh environment?3.4.9. Electrical penetrationsThe scope of the assessment applies to those electrical penetration assemblieswhich are required to conduct electrical power, and control and instrument circuitsthrough the reactor containment and preserve its leaktight integrity.Basis for acceptanceSafety Guide 50:SG-D7, paras 559-562.Safety Guide 50-SG-D12, Sections 4.2, 5.2.Assessment questions(1) Are the penetrations designed to take the identified loads?(2) Are the penetrations compatible with the cables which are leading throughthem?34