Abstract: The invention relates to a process for immobilizing, by an hydraulic binder, radioactive ion exchange resins or IER, which can contain borates in a quantity which can reach up to the equivalent of 1000 g H.sub.3 BO.sub.3 /kg of dry IER, wherein the IER are decanted and then placed in contact for a maximum of three hours with an eluant solution of 100 to 300 g/l in Ca(NO.sub.3).sub.2 in the proportion of 1 to 2 l/kg of decanted IER, an hydraulic binder of low hydration heat being added to the medium of pH.gtoreq.9 so that the ratio of the water of the eluant solution to the binder (by weight) is between 0.3 and 0.5 and that the incorporation rate:dry IER/final product (by weight) is between 3% and 10%.

Abstract: A flowmeter for dangerous fluids, using the deformation of a flexible metic diaphragm under the effect of a pressure variation caused by the liquid flow, the flowmeter being placed under a protective plate and comprising a body of general cylindrical shape placed inside a bowl equipped with a lower inlet connection piece for introducing liquid into the bowl and an upper outlet connection piece for receiving liquid leaving the bowl, the body having a calibrated inlet orifice on its lower face, an outlet orifice in its upper lateral part, the metallic diaphragm being situated in said body at the upper interior part of the body above said upper connection piece, and a metallic segment for sealing the joinder between the body and the bowl, at a level situated between the inlet and outlet connection pieces and a hollow pin, joined to said diaphragm and having a lower end extending into the calibrated orifice, the pin having an outlet orifice situated above the metallic diaphragm, the upper end of said pin extendin

Abstract: The present invention relates to a process for the immobilization of ion hange resins originating from the secondary circuits of pressurized water nuclear reactors and gas-cooled graphite-moderated reactors, wherein the ion exchange resins are saturated with a base, preferably sodium hydroxide, under conditions such that the pH of the medium is greater than about 9 and such as to favor the release of ammonia, after which the said resins are concreted with a hydraulic binder.