Patent ID: 7983377

Claim:
An emergency core cooling system, comprising: at least one direct vessel injection nozzle, arranged without protrusion towards a core barrel arranged in a reactor vessel, that injects a jet of emergency core cooling water toward the core barrel arranged in the reactor vessel, wherein the reactor vessel comprises a cooling system having a plurality of cold legs and hot legs installed thereon; and at least one injection extension duct arranged on an outer surface of the core barrel facing a corresponding direct vessel injection nozzle, the at least one injection extension duct being mechanically disconnected from the corresponding direct vessel injection nozzle and protruding from the core barrel toward the reactor vessel within a predetermined distance that is less than a hot leg surface defined by a hot leg inner diameter and less than an upper alignment key portion surface defined by a minimum inner diameter of an upper alignment key portion of the reactor vessel, wherein the at least one injection extension duct includes unperforated lateral faces inclined in a transverse direction at an angle of about 45° with reference to an outer surface of the core barrel, at least one air vent configured to permit gas discharge when the reactor vessel is filled with cooling water, and an emergency core cooling water intake port, arranged without protrusion towards the corresponding direct vessel injection nozzle, passing through an outer surface of the at least one injection extension duct, wherein the emergency core cooling water intake port includes a diameter about twice an inner diameter of the corresponding direct vessel injection nozzle and is axially aligned along the corresponding direct vessel injection nozzle such that the jet of emergency core cooling water injected from the corresponding direct vessel injection nozzle flows into the corresponding injection extension duct.