Nuclear reactor coolant pump and nuclear power plant having same

A nuclear power plant, comprising:

• a steam generator located in a reactor vessel and configured to generate steam by transferring heat supplied from a reactor core, to a secondary fluid introduced through a feed water line;
• and
• a reactor coolant pump configured to circulate a primary fluid inside a reactor coolant system, using a driving force generated by using at least part of the steam generated by the steam generator,
• wherein the reactor coolant pump includes:
• a pump impeller installed at a primary fluid flow path of the reactor coolant system, the pump impeller comprising a rotating shaft and configured to rotate in order to circulate the primary fluid in the reactor coolant system;
• a driving unit configured to rotate along a same axis as the rotating shaft of the pump impeller by receiving steam of a secondary fluid from the steam generator to generate a driving force for rotating the pump impeller, and configured to transmit the generated driving force to the pump impeller;
• and
• a steam supplying unit configured to form a flow path between the steam generator and the driving unit, to supply at least part of steam discharged from the steam generator to the driving unit,
• wherein the driving unit includes a driving turbine rotated along the same axis as the rotating shaft of the pump impeller by receiving steam from the steam supplying unit to convert a fluid force of steam into a mechanical rotation force,
• a casing formed to enclose the driving turbine, such that the primary fluid which circulates in the reactor coolant system is isolated from the secondary fluid which passes through the steam generator;
• and
• a steam collecting unit configured to form a flow path communicated with the casing and connected to a main steam line, to collect steam having passed through the driving unit and to supply the collected steam to a turbine system through the main steam line,
• wherein the pump impeller, the driving unit and the steam supplying unit are all located in the reactor vessel and above the steam generator.