Transfer container for nuclear reactor main cooling agent pump mechanical seals

Abstract

The invention relates to a transfer container for nuclear reactor main cooling agent pump mechanical seals. The transfer container comprises a barrel body, a barrel liner, a dewatering ball valve, barrel cover, annular nuts, movable bolts, shackles and a handle; the barrel body is divided into three layers from outside to inside, wherein the first and third layers are welded by stainless steel plates, and the second layer is a lead plate sandwich layer; the barrel liner is embedded in the barrel body; 12 movable bolt mounting plates are uniformly distributed on the outer side of the upper partof the barrel body; the movable bolts are mounted on the movable bolt mounting plates of the barrel body; and the annular nuts are mounted on the movable bolts. Mechanical seal parts are effectivelyprotected. An outer shell of the stainless steel barrel body is used for protection to effectively prevent collision of the mechanical seal parts in the transfer process; and the collective dosage ofoperators is reduced. A lead layer is added in the stainless steel sandwich layer around the barrel body for effectively shielding the radiation dose rate of high-dosage mechanical seals by about 80%,so that the personal radiation dose is reduced.

Description

technical field [0001] The invention belongs to the technical field of maintenance of nuclear grade pumps of nuclear reactors and radiation protection, and in particular relates to a mechanically sealed transfer container of a main coolant pump of a nuclear reactor. Background technique [0002] The shaft seal of the nuclear reactor main coolant pump (referred to as "main pump") is a mechanical seal device that prevents the leakage of radioactive coolant in the pump. Its performance directly affects the safe and reliable operation of the entire nuclear reactor. It is a must-do item for unit refueling maintenance every year. The components of the mechanical seal of the main pump have high matching precision, high cost, and high radioactivity on the surface. Therefore, the technical and skill requirements for maintenance personnel to replace the mechanical seal are relatively high. [0003] During the maintenance of mechanical seal components, mechanical seal transfer contain...

AI Technical Summary

Problems solved by technology

The current transportation method of mechanical seals has the following disadvantages: 1. The maintenance area of ​​the mechanical seal is narrow, and there is a risk of large damage to the components during the hoisting and transshipment process; 2. Highly radioactive media remain inside the equipment during the mechanical seal transshipment, and there are pollution diffusion and personnel problems. Contamination risk; 3. The shaking of the mechanical seal during transportation may cause the matching displacement between the parts, seriously affecting the quality of equipment assembly, and even rework and reassembly; 4. The maintenance of the mechanical seal belongs to the first level of anti-foreign matter, which may cause dust, Foreign matter such as debris enters the interior of the equipment, which does not meet the requirements of foreign matter control management and seriously affects the quality of equipment assembly; 5. After the mechanical seal is removed, the surface is highly radioactive, resulting in a large dose of exposure to the workers during the entire transfer process

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