Patent Number: 
Section: claims

1. A lower end plug for an internally and externally-cooled annular nuclear fuel rod comprising:a support with a slenderness ratio in the range of 1 to 20;a coolant inflow part with an inner inflow space and a plurality of inflow holes in a wall thereof, so as to interact with the inflow space, coupled to a lower end of the internally and externally-cooled annular nuclear fuel rod at an upper end thereof, and extending from an upper end of the support in a reverse conical shape such that the inflow space interacts with an inner channel of the internally and externally-cooled annular nuclear fuel rod; anda coupler extending from a lower end of the support and coupled with a handling tool of the internally and externally-cooled annular nuclear fuel rod,wherein each of the inflow holes is inclined in such a manner that an outer end thereof, exposed outwards, is located lower than an inner end thereof, exposed inwards. 2. The lower end plug as set forth in claim 1, wherein each of the normal lines of faces that the outer end and the inner end of inflow holes form is formed perpendicular to the wall of the coolant inflow part.