A method for jacking up the rotor of a main coolant pump motor in a nuclear power plant

Abstract

The invention relates to the technical field of nuclear power debugging and maintenance, and specifically discloses a method for jacking up the rotor of a main coolant pump motor in a nuclear power plant, comprising the following steps: Step 1: Confirm the initial state of the valve; Step 2: Adjust the state of the valve so that the main coolant The rotor of the pump motor is subjected to upward force; Step 3: The rotor of the main coolant pump motor is jacked up; Step 4: Restore the valve state. The method of the invention has high reliability, convenient operation, shortens the operation period, reduces the collective radiation dose, and has reference significance for the lifting or lifting method of the main pump motor rotor of the same power plant.

Description

technical field [0001] The invention belongs to the technical field of nuclear power debugging and maintenance, and in particular relates to a method for jacking up the rotor of a main coolant pump motor of a nuclear power plant. Background technique [0002] When the oil temperature of the main coolant pump of the nuclear power plant, that is, the motor bearing chamber of the main pump, is less than 20°C, the conditions for starting the main pump are not met, and the lubricating oil temperature needs to be raised by starting the jacking oil pump. In order to avoid the oil film establishment affected by the load on the auxiliary shoe caused by long-term start-up of the jacking shaft oil pump, the rotor jacking or lifting operation must be carried out before the start-up of the main pump. The quality of the jacking effect and the length of the operation period will directly affect the safe and reliable start-up and operation of the main pump. If there is an abnormality, it wi...

AI Technical Summary

Problems solved by technology

[0004] 1. When the rotor is lifted by using the special tooling for lifting the main pump motor rotor and the ring crane, the center of the macroscopic motor rotor and the ring lifting point can only be aligned with the naked eye, and the accuracy cannot be guaranteed, such as the gap between the upper guide tile and the main pump motor The center deviation of the verticality of the rotor and the concentricity of the main pump motor rotor and stator is relatively large, which will seriously affect the assembly quality of the main pump motor and increase the risk of equipment damage;

[0005] 2. The operation period is long, and the entire rotor lifting operation process is complicated, and the operation period needs at least 20 hours / 3 sets;

[0006] 3. It consumes a lot of manpower and material resources, and at least 10-12 people are required to cooperate with each other to carry out the operation;

[0007] 4. When the commercial nuclear power unit conducts this operation, due to the large number of operators and the long time, the collective exposure dose of the operation group is relatively high

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