Method for monitoring the activity of a gaseous or liquid means in a control-volume in nuclear plants and device for carrying it out

摘要

The invention is provided in particular for monitoring the activity of the vessel atmosphere (A1) and, if necessary, of the building sump water (A2) in the containment vessel (1) of a nuclear power plant. Transport fluid is fed from a transport fluid source (3) into a transport fluid branch line (5), which is laid on a part of its length in the containment (A0) of the containment vessel (1) as a bleedline section (5c) and fed back into a header (3) arranged outside the containment vessel. The transport fluid is mixed in the containment (A0) by means of at least one bleed fitting (8) with a defined sample volume of the medium to be monitored, so that in the case of the particular sampling the mixture is fed to the header (3). From the latter, the mixture or a gaseous component of the mixture is fed to at least one measurement section (23, 25, 28) for measuring the radioactivity of the monitored medium. The transport fluid is, in particular, water. A device for carrying out the method is described which has a particular configuration of the bleed fittings (8). IMAGE