Pressurised-water reactor having a reactor pressure vessel

摘要

There is a flow of primary coolant in the direction of the arrow through a reactor core (1) arranged in the reactor pressure vessel (2). Only a deficient circulation and cooling still takes place in the space (12) bounded by the closure head (3) in the event of failure of the pumps installed in the part of the primary circuit extending outside the reactor pressure vessel. For the purpose of avoiding the formation of steam or of rapidly reducing the formation of steam in this space, a coolant line (10) reaches with its free end (11) deep into the reactor pressure vessel closure head (3). In this arrangement, the part (10a) of the coolant line (10) that is arranged inside the closure head (3) is constructed throughout its entire length as a multi-nozzle feed/spray device. <IMAGE>