Canned reactor coolant pump locking cup local video inspection method

Abstract

The invention discloses a canned reactor coolant pump locking cup local video inspection method. The method comprises the following steps of S1, installing a soft guide pipe extending to a position near an inspection space at an inspection inlet of a canned reactor coolant pump, wherein the inspection space is located between a thrust bearing and a locking cup both in the canned reactor coolant pump; S2, extending an endoscope probe into the inspection space along the soft guide pipe; and S3, operating the endoscope probe to enable the endoscope probe to circularly move along the inspection space to inspect the locking cup. According to the method, the video inspection can be carried out on the locking cup of the canned reactor coolant pump in the high-radioactivity environment of a localcanned motor pump of a nuclear power plant, the endoscope probe is guided to reach the interior of the inspection space through the soft guide pipe so that the endoscope probe can complete a pluralityof 90-degree turns in a narrow space, and the video inspection on the surface of the locking cup of the canned motor pump is completed; and the operation is convenient, the inspection efficiency is high, the tools are simple, the investment is low, the inspection period is short, the equipment of the power plant is free of any damage, and the inspection cost of the power plant is greatly saved.

Description

technical field [0001] The invention belongs to the inspection field of shielded reactor coolant pumps in nuclear power plants (hereinafter referred to as: shielded main pumps), and specifically relates to a video inspection method for the locking cup of the main pump without dismantling the shielded main pump in an in-situ high-radioactive environment . Background technique [0002] The shielded main pump of the nuclear power plant is the core equipment of the nuclear power plant. During the manufacturing process, the locking cup of the shielded main pump may have manufacturing stress concentration or weak areas. After a long period of operation, it may be affected by temperature, stress, vibration, etc. Defects can even affect the operation of the unit in severe cases. [0003] The locking cup is located inside the shielded main pump and is an annular part with a thrust bearing on its outside. Through the structural analysis of the locking cup, the main difficulties in d...

AI Technical Summary

Problems solved by technology

Through the structural analysis of the locking cup, the main difficulties in determining the inspection are as follows: 1. The inspection space is narrow: the locking cup is located in the center of the canned pump, and its outer side surrounds the thrust bearing. There is a gap between the locking cup and the thrust bearing. 6.3mm annular space; 2. The inspection path is complicated: the inspection entrance is at the lower part of the shielded pump, and the endoscope probe needs to be folded upward for 4-6 90° bends to reach the inspection site, and complete the inspection of all inspection sites; 3 1. High risk of inspection: During the inspection process, if the endoscope lens is stuck in the inspection part and cannot be taken out by retraction, the main pump can only be disassembled and taken out, which is labor-intensive and time-consuming, and affects the operation of the unit. The loss will be hundreds of millions. huge amount

Images