Steam generator comprising an emergency feed water device

Steam generator comprising an outer jacket (2) of generally cylindrical shape arranged with its vertical axis having a lower cylindrical part (2a) containing a bundle (3) of heat exchange tubes connected to a primary fluid circuit and arranged in a bundle wrapper (4) which is substantially coaxial with the outer jacket (2), an upper cylindrical part (2b) having a diameter greater than the diameter of the lower part (2a) in particular containing separators and steam dryers (15) and a part (2c) with a frustoconical junction between the lower part (2a) and the upper part (2b) of the outer jacket (2), at least a first and a second device (8, 16) for supplying feed water to an annular space (7) between the bundle wrapper (4) and one of a guide skirt (13) and the outer jacket (2), via the upper part of the annular space (7) which communicates with the inner space of the bundle wrapper (4) at its lower part, each one comprising a feed water distribution header (10, 17) in the annular space (7) arranged inside the outer jacket (2) having a toroidal wall substantially coaxial with the outer jacket (2) and with the bundle wrapper (4), the toroidal wall being penetrated by a plurality of openings for the passage of water into its upper part and at least one feed water supply pipe (9, 19) in a space inside the toroidal wall of the header (10, 17) penetrating the outer wall (2) of the steam generator (1), the first feed device (8) being used during normal operation of the steam generator (1) and the second feed device (16) being used in order to feed the steam generator (1) with emergency water, characterized in that the second toroidal header (17) of the second emergency feed water device (16) placed inside the upper part (2b) of the outer jacket (2) comprises, fastened to each of its openings (21) for the passage of water from its toroidal wall, a tube (22) for injecting water having an open lower end part (22a) fastened to the opening (21) of the toroidal wall, a straight part (22b) which is inclined with respect to the vertical axial direction in the direction of a central part of the steam generator (1) and an upper end open at the end of the straight part (22b) of the tube (22) for injecting emergency water inside the steam generator (1).