Marine nuclear power platform reactor pressure vessel support skirt

Abstract

The invention relates to a supporting skirt for a reactor pressure vessel of an ocean nuclear power platform. The supporting skirt comprises a cylinder body, and the supporting skirt is characterizedin that the cylinder body has a thin-wall cylinder structure, three or more kidney-shaped discharge holes are arranged in the upper part of the cylinder body, the long axis and the short axis of eachkidney-shaped discharge hole are respectively located in the vertical direction and the horizontal direction, the kidney-shaped discharge holes are located in the same horizontal height, and the distance between the center lines of the kidney-shaped discharge holes and the top end of the cylinder body is 350 mm to 450 mm; and one or more circular manholes which are also used as water inlet holes are formed in the lower part of the cylinder body, the manholes which are also used as water inlet holes are located at the same horizontal height, the distance between the center lines of the manholeswhich are also used as the water inlet holes and the bottom end of the cylinder body is 300 mm to 600 mm, and the upper end surface and the lower end surface of the cylinder body are respectively welded with the reactor pressure vessel and a containment bottom plate. The supporting skirt provided by the invention has a simple structure, easily guides out heat, and can reduce irradiation degradation of weld joints and deck materials, and prolong the service life.

Description

technical field [0001] The invention relates to the bearing and fixing of reactor pressure vessels under marine environment conditions, in particular to the supporting skirt of reactor pressure vessels of marine nuclear power platforms. Background technique [0002] The reactor pressure vessel is usually carried and fixed by a support structure. On the one hand, the support structure must bear the contents of the reactor pressure vessel and the loads generated and transmitted by related mechanisms and structures, and at the same time limit the displacement of the reactor pressure vessel in all directions. The commonly used support forms of reactor pressure vessels in existing nuclear power plants or nuclear facilities mainly include circular support structures and support skirt (thin-walled cylinder) structures. [0003] The reactor pressure vessels of land-based nuclear power plants or nuclear facilities generally adopt a circular support structure, and its use status is as...

AI Technical Summary

Problems solved by technology

This structural form can limit the displacement of the reactor pressure vessel in any direction, and is suitable for the marine environment, but there are still the following disadvantages: 1. Due to the high cumulative dose of neutron irradiation of each component of the reactor, the weld material deteriorates, which in turn affects the use 2. Since the support skirt is a whole section of closed thin-walled cylinder, when the core melt accumulates on the bottom head, the heat cannot be discharged in time, and may melt through and leak, resulting in accidents; 3. Since the support skirt is a whole section of closed thin-walled cylinder During installation, the welds at the lower end cannot be cleaned, and the upper welds are difficult to carry out non-destructive testing, posing safety risks; 4. Since the support skirt is a closed thin-walled cylinder, the insulation layer can only be installed on the outside of the support skirt, resulting in large heat loss. and cannot install pile bottom shielding within the support skirt to address radiation degradation of deck materials

Images