Floating roof type diaphragm structure, detection method thereof, and liquid level calibration method of backpressure water

Abstract

The invention discloses a floating roof type diaphragm structure, a detection method thereof, and a liquid level calibration method of back pressure water. The liquid level calibration method of the backpressure water should be carried out after the backpressure water reaches a standard value and comprises the steps of measuring and calibrating the liquid level of the backpressure water; the method particularly comprises the steps that a liquid storage tank is recovered to an online state from an emptying state, a medium is slowly filled into the liquid storage tank, and the relative positionof the liquid level of the backpressure water needs to be recorded every time the liquid level rises by a certain distance; then the distance between the liquid level of the backpressure water and thereference in different states is measured by using a measuring tape, and the results are recorded; and several special point locations are selected as reference and judgment bases for field personnelinspection. The backpressure water liquid level mark calibrated by the liquid level calibration method can help workers to observe the relationship between the liquid level of the backpressure waterand the liquid level of the liquid storage tank very visually, so that the workers can know the operation condition of equipment at any time, normal operation of the equipment is guaranteed, and the detection workload is greatly reduced.

Description

technical field [0001] The invention relates to the field of nuclear power generation, in particular to a floating roof diaphragm structure, a detection method thereof and a liquid level calibration method of back pressure water. Background technique [0002] Units 1 and 2 of Fangchenggang Nuclear Power Plant are CPR1000 reactors. The REA / TEP system is equipped with 5 floating roofs, which are used for storage of deaerated water, distilled water, and concentrated boron. They are key equipment for chemical control of the primary circuit and unit power regulation. Since the handover of the project, floating roof tilting and bulging defects have frequently occurred. Among them, F9TEP007BA often has bulging due to the inability to make up the back pressure water, and the equipment cannot run stably and continuously, which affects the boron production work plan of the system. Before January 31, 2018, F9TEP007BA filled in a total of 22 NG notices due to the floating roof problem, ...

AI Technical Summary

Problems solved by technology

Since the handover of the floating roof, the floating roof has frequently experienced tilting and bulging defects, among which F9TEP007BA often has bulging due to the failure of back pressure water to make up, and the equipment cannot run stably and continuously, which affects the boron production work plan of the system

Before January 31, 2018, F9TEP007BA filled in a total of 22 NG notices due to the floating roof problem, and issued tickets 15 times (6 second-level tickets) to eliminate the shortage, which consumed a lot of manpower and time

[0010] When the back pressure water is excessive, the balance of the floating roof will be greatly reduced. Once the back pressure water accumulates in the low place, the floating roof will be tilted obviously, and the back pressure water will flow through the floating roof even when the equipment is at a low liquid level. , causing the floating roof to sink

[0011] There are limitations in the maintenance method of the prior art: in the original maintenance method, back pressure water cannot be added during the operation of the equipment, because neither the remaining water nor the amount of water to be added is known, and if excessive water is added, It may cause damage to the capsule, and at the same time affect the stability of the floating roof at a low liquid level. At this time, the excessive back pressure water level may even cause water to flow in from the floating roof, causing the floating roof to sink

There is no reference standard for back pressure water volume, and maintenance personnel cannot judge whether the water volume is sufficient, which has become a problem left over from history

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