EMERGENCY POWER SUPPLY SYSTEM AND EMERGENCY INDEPENDENT POWER SUPPLY, FOR NUCLEAR POWER PLANT

摘要

PROBLEM TO BE SOLVED: To feed power to significant apparatuses in terms of safety of a nuclear power plant at abnormal time of a normal power supply system.SOLUTION: An emergency power supply system for a nuclear power plant includes: first level emergency power supply for supplying power in a level 1 state; and a second level emergency power supply 10 for supplying the power in a level 2 state. The second level emergency power supply 10 includes: a first rotary electric machine 16a electrically and directly connected to at least one of normal power supply and the first level emergency power supply; a second rotary electric machine 16b not being electrically connected and being mechanically connected to the first rotary electric machine 16a; a second level emergency bus bar 14 being electrically connected to the second rotary electric machine 16b via a circuit breaker 17a and feeding the power to an emergency load; and a backup generator 15 starting up in the level 2 and supplying emergency power to the second level emergency bus bar 14.