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Design of Emergency Power Systems for Nuclear Powerplants

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35. The protective devices against overloads and short circuits should be properly sized, calibrated and co-ordinated so that the EPSs perform as designed and protect the equipment, buses and cables of the main and branch circuits from damage in overload and fault conditions. The co-ordination of the protective devices should be such that only the faulty part of the EPSs is isolated and the remaining intact circuit is unaffected. 36. It may be necessary in some situations to operate the equipment of safety systems in overloaded conditions to ensure the fulfilment of certain safety actions.

1. Provisions should be made in the design to include programmes to ensure that: (a) (b) (c) (d) Each division of the EPSs performs as intended under the conditions specified in the design basis; The equipment and the system conform to the design requirements; Divisions of the EPSs are maintained in a state of readiness to respond to the demands on them over the lifetime of the plant; Effective maintenance can be performed (preferably during normal operation) to keep unplanned outages to a minimum.

50 REFERENCES [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] INTERNATIONAL ATOMIC ENERGY AGENCY, Safety of Nuclear Power Plants: Design, Safety Standards Series No. NS-R-1, IAEA, Vienna (2000). INTERNATIONAL ATOMIC ENERGY AGENCY, Instrumentation and Control Systems Important to Safety in Nuclear Power Plants, Safety Standards Series No. 3, IAEA, Vienna (2002). INTERNATIONAL ATOMIC ENERGY AGENCY, Application of the Single Failure Criterion, Safety Series No. 50-P-1, IAEA, Vienna (1990).

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