Patent BG-111534-A (BG)
Title: Passive vertical and horizontal capping units for preventing the leak of melt out of the hermetic zone during a serious accident in a nuclear power plant
Inventor: YURUKOV VLADIMIR
IPC: G21C11/00
Filed: 2013-07-11
Abstract: The passive vertical capping unit for preventing the leak of melt on the mechanism of early bypass of the hermetic zone/hermetic volume during a serious accident in a nuclear power plant consists of a vertical cylindrical central pipe (1), raised and fixed on a steel plate (2). Around the pipe (1) there is a casing pipe (3), mounted in a concrete structure (4.b). In the lower part of the pipe (1) there is a solid bioprotective cylinder consisting of two semi-cylindrical segments (5.1 and 5.2). Between the two segments (5.1 and 5.2) there is a central opening/groove (6), in which there is a cable/rope (8). The space between the casing pipe (3) and the vertical pipe (1) is filled with concrete (9). Above the bioprotective cylinder from the two segments (5.1 and 5.2) there is a cap from two segments (7.1 and 7.2), fixed tightly together with clamps (12.1 and 12.2) the groove (6) also passes between these two segments (7.1 and 7.2). In these segments there are gaps forming respective cavities (10.1 and 10.2), whose lower inclination of the two segments (7.1 and 7.2), supports a closing sphere-shutter (11), which is fixed on the side by the cable/rope (8). Passive horizontal capping unit for preventing the leak of melt on the mechanism of early bypass of the hermetic zone/hermetic volume during a serious accident in a nuclear power plant consists of a central, cylindrical pipe (13), which is in a concrete structure (4.х) with a horizontal inclination at an angle alpha from 6 to 30 degrees to the horizontal. In a central pipe (13) there is a hull pipe (14), in which there is a support ring (15), which is welded to the hull pipe (14). A support ring (15) blocks a tightly pressed to it tapered saddle (16), whose head (17) is cone-shaped with a funnel form (17), in front of which there is a welded to the hull pipe (14) spacer ring (23). Between the support ring (15) and the pressing plate (18) there is a tensioned spring (19). Between the loop with a screw and nut (28) of the pressing plate (18) by means of the loop with a screw and nut (28) and the loop of the fastening screw (25.2), screwed in a bushing (26.2) in the closer to the spring (19) end of the closing organ (20) there is a connecting rod (21). The closing organ (20) has streamlined truncated cones (20.1 and 20.2) from both its ends. Its middle part (20.3) is also a truncated cone with its smaller base toward the mouth of the saddle (16). The groove is leading-through from the intake of the hull pipe (14), through a spacer ring (23), the saddle (16), support ring (15), through the openings of the pressing plate (18) and the end of the hull pipe (14). The cone surfaces of the inside of the spacer ring (23), head (17) and inside of the saddle (16), gradually flow into one another. At the other end of the closing organ (20), to the loop of the fastening screw (25.1) screwed in a bushing (26.2) there is a rod (24), fixed to an anchoring element (22), fixed to the hull pipe (14).