Reactor circulating pump system

A reactor circulating pump system comprising:

• a pump unit for circulating a coolant in a reactor;
• and
• a power supply means operatively connected to the pump unit for driving the pump unit,
• said power supply means comprising:
• an excitation power supply means;
• a superconducting energy storage means including a plurality of super conducting energy storage elements connected in parallel to each other;
• an AC/DC converter;
• a DC/AC converter provided with an AC voltage/frequency adjuster, said excitation power supply means, said superconducting energy storage means, said AC/CD converter and said DC/AC converter being connected in series between an in-plant AC bus and the pump unit with the excitation power supply means being on the in-plant AC bus side and the DC/AC converter being on the pump unit side;
• and
• a control means operatively connected to said in-plant AC bus side, said superconducting energy storage means and said pump unit so as to operate by turns to output a power for driving said pump unit, thereby holding a predetermined pump delivery rate in a normal state and to control the pump delivery rate to have a predetermined value in accordance with an information indicating an accident.