Lower horizontal supporting structure of nuclear power plant vapor generator

Abstract

The invention discloses a lower horizontal supporting structure of a nuclear power plant vapor generator. The lower horizontal supporting structure of the nuclear power plant vapor generator comprises a supporting device for preventing the vapor generator from generating instant displacement. The supporting device comprises a base and an axial clearance adjustment device arranged on the base. The base is shaped like a stepped shaft in outline, and the outer diameter of the base is gradually decreased from back to front to form a base large end and a base secondarily large end. The front section of the base large end is of a hollow structure, the inner diameter of the front section of the base large end is larger than the outer diameter of the base secondarily large end, and therefore a radius difference delta[r] is formed between the inner wall of the front section of the base large end and the outer wall of the base secondarily large end. Compared with the prior art, the lower horizontal supporting structure of the nuclear power plant vapor generator has the following effects that (1) the base with a buffering function is simple in structure, excellent in buffering performance and convenient to install and maintain, and the manufacturing and installation cost is effectively lowered; (2) clearance measurement operation is convenient and rapid, and the measurement result is small in error; and (3) clearance adjustment is more convenient, the time of clearance measurement and adjustment is effectively shortened through the structure, and the time cost and labor cost are reduced.

Description

technical field [0001] The invention relates to a lower horizontal support structure of a steam generator of a nuclear power plant. Background technique [0002] Under normal working conditions, the supporting structure of the steam generator in a nuclear power plant can provide support for the steam generator and bear the supporting load under corresponding working conditions; The structure can ensure the unconstrained free thermal expansion and thermal displacement of the steam generator; when an earthquake or a dehydration accident occurs (hereinafter referred to as a LOCA accident), the supporting structure of the steam generator can limit the instantaneous displacement of the steam generator, Ensure the stability and safety of reactor coolant systems, steam generators and civil structures. [0003] The disclosed horizontal support structure for the lower part of the steam generator in a nuclear power plant is composed of a lateral limit seat 2 and a front end limit sea...

AI Technical Summary

Problems solved by technology

[0005] 1. The square buffer block used has a long procurement cycle and high cost, and later installation, operation and maintenance are more troublesome;

[0006] 2. The measurement and adjustment of the gap needs to be repeated every time the fuel is changed, which increases the input of manpower and material resources of the maintenance personnel;

[0007] 3. Due to the small adjustment gap between the adjustment block and the cushion block, the measurement operation space is limited, and the adjustment block is relatively long, it is difficult for the measuring equipment to accurately measure the adjustment gap at these positions, resulting in large measurement errors;

[0008] 4. The adjusted gap value measured under the condition of each refueling hot shutdown needs to be evaluated by a professional company or institution, and the evaluation cost is high and the duration is long;

Images