Abstract: A page buffer, a semiconductor memory having the same, and an operating method thereof are provided. The page buffer includes a first current supply circuit connected to a bit line, the first current supply circuit connecting or blocking a power voltage node to or from a common sensing node based on a potential level of the bit line; a second current supply circuit for controlling a potential level of a sensing node based on a current amount of the common sensing node; and a latch unit for latching data based on a potential of the sensing node.

Abstract: A page buffer, a semiconductor memory having the same, and an operating method thereof are provided. The page buffer includes a first current supply circuit connected to a bit line, the first current supply circuit connecting or blocking a power voltage node to or from a common sensing node based on a potential level of the bit line; a second current supply circuit for controlling a potential level of a sensing node based on a current amount of the common sensing node; and a latch unit for latching data based on a potential of the sensing node.

Abstract: Disclosed is a decay heat removal system for cooling the decay heat of a reactor core and the spent fuel. The decay heat removal system including: a first heat pipe which is placed in an upper plenum of the reactor vessel and arranged in upward and downward directions corresponding to a position of an insertion hole formed on a top of the nuclear fuel assemblies; a control rod drive mechanism which is connected to an upper portion of the first heat pipe and drives the first heat pipe to move up and down so that the first heat pipe can be selectively inserted in a control rod insertion hole of the reactor core arranged in the nuclear reactor vessel; and a second heat pipe which is coupled to and in close contact with a bottom surface of the reactor vessel and removes the decay heat generated in the reactor core.

Abstract: Disclosed is a decay heat removal system for cooling the decay heat of a reactor core and the spent fuel. The decay heat removal system including: a first heat pipe which is placed in an upper plenum of the reactor vessel and arranged in upward and downward directions corresponding to a position of an insertion hole formed on a top of the nuclear fuel assemblies; a control rod drive mechanism which is connected to an upper portion of the first heat pipe and drives the first heat pipe to move up and down so that the first heat pipe can be selectively inserted in a control rod insertion hole of the reactor core arranged in the nuclear reactor vessel; and a second heat pipe which is coupled to and in close contact with a bottom surface of the reactor vessel and removes the decay heat generated in the reactor core.