Venting system for the containment structure of a nuclear installation

It is sought to provide a pressure release system (30) for the containment structure (4) of a nuclear installation (2), which pressure release system permits effective and reliable operation of a wet scrubber (36) for the pressure release flow with a simultaneously compact design, in particular with regard to the amounts of washing fluid (52) that must be kept available. This is achieved according to the invention by means of a pressure release system (30) having a pressure release line (28) which is guided through the containment structure (4) and which can be closed off by means of a shut-off fitting (26), a wet scrubber (36), which is connected into a section of the pressure release line (28) situated within the containment structure (4), for the pressure release flow generated during pressure release operation with the shut-off fitting (26) open, a reservoir (100) which is situated within the containment structure (4) and which is connected in terms of flow to the rest of the interior of the containment structure (4) such that a positive pressure prevailing there in relation to the environment outside the containment structure (4) is at least partially, preferably predominantly or entirely, transmitted to the reservoir (100), and a feed line (72) which leads from the reservoir (100) to the wet scrubber (36) and which serves for the feed of liquid (14), which acts as washing fluid (52), from the reservoir (100) to the wet scrubber (36), wherein the wet scrubber (36) has a washing fluid vessel (38) which is sealed off with respect to the rest of the interior of the containment structure (4), and wherein a throttle section (102) is formed in a section of the pressure release line (28) upstream of the passage (44) into the washing fluid vessel (38).