Patent Number: 047568763
Section: claims

1. In a nuclear reactor having a liquid coolant at a high pressure of the order of 155.10.sup.5 Pa and at a high temperature of the order of 320.degree. C., a modular ultrafiltration device comprising (a) a containment the walls of which are made of a material absorbing radiation, said contaiment incorporating a removable cover;  (b) an ultrafilter (15) which is arranged inside the containment (1) and has a pressure-resistant casing (8) open at one of its ends (8a) provided with a connecting flange (9), and which contains a removable ultrafiltration assembly (10) which can be introduced or removed via an orifice in the casing (8), and an inlet connection piece (12) for liquid to be purified, a filtrate-outlet connection piece (16) and a concentrate-outlet connection piece (14) passing through the pressure-resistant casing (8);  (c) a concentrate circulation pump (25) fastened to the removable cover (7) of the containment (1) and incorporating a connecting flange (26) matching the connecting flange (9) of the pressure-resistant casing (8), to form together with this casing (8), when the removable cover (7) and the pump (25) are in the operating position, a closed and leak-proof volume in which the concentrate is made to circulate by means of the pump (25);  (d) a heat exchanger (32) placed in the containment (1) and connected to the concentrate-oulet connection piece (14) penetrating into the heat exchanger (32) cooling the concentrate, as well as to a cooled-concentrate discharge connection piece (35) and to an inlet connection piece (37) and an outlet connection piece (39) for cooling fluid;  (e) connection means (13, 17, 36, 38, 40) fastening respectively to the inlet connection piece (12) for liquid to be purified, to the filtrate-outlet connection piece (16), to the concentrate discharge connection piece (35) and to the inlet and outlet connection pieces (37, 39) for cooling fluid, outside the containment (1), these connection pieces passing through the walls (2) of the containment in a leak-proof manner; and  (f) a heat-insulating material (41) in divided form which fills the free volume of the containment (1).  beams (50) radially arranged between the casing (8) of the ultrafilter (15) and the inner wall of the containment (1), to absorb forces which can arise under accidental conditions. 2. Modular device according to claim 1, comprising 3. Modular device according to claim 1, wherein the casing (8) of the ultrafilter (15) is a substantially cylindrical shape with a vertical axis ZZ' and is open in its upper part, and the assembly consisting of the removal cover (7), the pump (25) and its flange (26) comes to rest on the connecting flange (9) of the casing (8). 4. Modular device according to claim 3, wherein the pump (25) has a lifting ring (32) for selectively lifting and putting down the assembly resting on the flange (9) of the casing (8) of the ultrafilter (15). 5. Modular device according to claim 3, wherein the removable cover (7) of the containment (1) has holes (29) in a vertical line with means of fastening the flanges (26 and 9) to one another. 6. Modular device according to claim 1, wherein the containment (1) incorporates lifting rings (31) for transporting it and installing it in the reactor as a single unit. 7. Modular device according to claim 1, wherein the ultrafilter (15) incorporates partitionings (21, 22) for guiding the concentrate and the filtrate inside the casing (8) and inside the ultrafiltration assembly (10) respectively.