A safety facility for a nuclear power plant comprising: a hazard-resistant wall; and a space surrounded by the hazard-resistant wall, the space containing at least: a water pouring pump adapted to supply water to an inside of a reactor building including a reactor pressure vessel and a primary containment vessel, the reactor pressure vessel storing a reactor core therein and maintaining a pressure in the reactor pressure vessel constant, and the primary containment vessel including the reactor pressure vessel; a cooler facility adapted to cool equipment contained in the space; a generator adapted to generate electric power required for the equipment contained in the space; an operation panel in disaster that is used to operate equipment in emergency; and a communication information room provided with equipment for communicating with the outside; characterized by further comprising a movable heat-removing system including a mobile facility for alternative heat-exchanging and a power-source vehicle for the mobile facility for alternative heat-exchanging, the mobile facility for alternative heat-exchanging being adapted to remove heat of cooling water in the reactor building from an outside of the reactor building, and the power-source vehicle being adapted to supply electric power to the mobile facility for alternative heat-exchanging; a portable pump being adapted to supply cooling water to the inside of the reactor building from the outside of the reactor building; a power-source vehicle being adapted to supply electric power to equipment in the reactor building from the outside of the reactor building; a battery being adapted to supply operation power to the generator installed in the safety facility; a portable temporary power-source capable of being moved to and installed at a required location; and an emergency water-source being adapted to supply water to the reactor building. a hazard-resistant wall; and a space surrounded by the hazard-resistant wall, the space containing at least: a water pouring pump adapted to supply water to an inside of a reactor building including a reactor pressure vessel and a primary containment vessel, the reactor pressure vessel storing a reactor core therein and maintaining a pressure in the reactor pressure vessel constant, and the primary containment vessel including the reactor pressure vessel; a cooler facility adapted to cool equipment contained in the space; a generator adapted to generate electric power required for the equipment contained in the space; an operation panel in disaster that is used to operate equipment in emergency; and a communication information room provided with equipment for communicating with the outside; a water pouring pump adapted to supply water to an inside of a reactor building including a reactor pressure vessel and a primary containment vessel, the reactor pressure vessel storing a reactor core therein and maintaining a pressure in the reactor pressure vessel constant, and the primary containment vessel including the reactor pressure vessel; a cooler facility adapted to cool equipment contained in the space; a generator adapted to generate electric power required for the equipment contained in the space; an operation panel in disaster that is used to operate equipment in emergency; and a communication information room provided with equipment for communicating with the outside; characterized by further comprising a movable heat-removing system including a mobile facility for alternative heat-exchanging and a power-source vehicle for the mobile facility for alternative heat-exchanging, the mobile facility for alternative heat-exchanging being adapted to remove heat of cooling water in the reactor building from an outside of the reactor building, and the power-source vehicle being adapted to supply electric power to the mobile facility for alternative heat-exchanging; a portable pump being adapted to supply cooling water to the inside of the reactor building from the outside of the reactor building; a power-source vehicle being adapted to supply electric power to equipment in the reactor building from the outside of the reactor building; a battery being adapted to supply operation power to the generator installed in the safety facility; a portable temporary power-source capable of being moved to and installed at a required location; and an emergency water-source being adapted to supply water to the reactor building.