Sparger for reducing the concentration of radioactive materials and nuclear power plant having the same

A sparger comprising:

• a main pipe configured to connect inside and outside of a water tank, the water tank having a storage space therein for storing cooling water, so as to define a flow path through which steam and air containing radioactive materials generated at the outside of the water tank are discharged into the cooling water in the storage space;
• a header part connected to one end portion of the main pipe located in the storage space, and having a storage chamber in which the steam and air transferred through the main pipe are collected;
• a plurality of discharge nozzles each having an inlet and an outlet formed at one end portion located in the storage chamber and another end portion located in the storage space, respectively, to discharge the steam and air from the storage chamber to the storage space, the plurality of discharge nozzles being spaced apart from one another and at least some of the plurality of discharge nozzles protruding from the header part by different lengths,
• wherein the plurality of discharge nozzles extends from the inside of the storage chamber into the storage space through the side surfaces of the header part in a direction away from the header part, and is configured to have the same sum of a length of one end portion extending into the storage chamber and a length of another end portion extending into the storage space, based on the side surfaces of the header part.