Method for preventing abnormity of mechanical seal leakage rate of nuclear reactor coolant pump

A technology for coolant pumps and mechanical seals, which is applied in the field of prevention of abnormal leakage and flow rate of nuclear reactor coolant pump mechanical seals. It can solve the problems of No. 1 shaft seal damage and unfavorable No. 1 shaft seal leakage, so as to prolong life and improve sealing conditions. , Safe and reliable operation effect

Active Publication Date: 2012-05-16
GUANGDONG NUCLEAR POWER JOINT VENTURE +1
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Problems solved by technology

When the pressure difference across the filter exceeds the rated value, it means that a large amount of impurities have accumulated in the

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  • Method for preventing abnormity of mechanical seal leakage rate of nuclear reactor coolant pump
  • Method for preventing abnormity of mechanical seal leakage rate of nuclear reactor coolant pump
  • Method for preventing abnormity of mechanical seal leakage rate of nuclear reactor coolant pump

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Embodiment Construction

[0021] The implementation of the method for preventing abnormal leakage of the mechanical seal of the nuclear reactor coolant pump according to the present invention will be described in detail below in conjunction with specific embodiments.

[0022] Since part of the water in the shaft seal injection water circuit flows into the primary circuit, the other part of the water and the shaft seal leakage water return to the shaft seal injection water circuit together. During stable operation, the boron concentration of the online column filter and the boron concentration of the primary circuit It is consistent, so the boron concentration of the filter of the online operation column can be obtained by detecting the boron concentration of the first loop, and the boron concentration of the first loop can be read from the boron concentration meter of the first loop; after obtaining the boron concentration of the first loop and the standby column The boron concentration of the filter is...

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Abstract

The invention relates to a method for preventing abnormity of mechanical seal leakage rate of a nuclear reactor coolant pump. An injection water loop of a No. 1 shaft seal of a coolant pump is provided with two parallel columns of filters; one row of the filters are operating on the line, and the other column of filters are for standby. The preventive method comprises the following steps: S1. detecting a boron concentration of a loop; S2. comparing the boron concentration of the loop with that of the row of filters for standby; and S3. when a difference between the boron concentration of the standby row and that of the loop exceeds a preset value, switching the standby column of filters to on-line operation, and switching the on-line operating row of filters into a standby state. In the preventive method of the invention, when the difference between the boron concentration of the standby column and that of the loop exceeds the preset value, filter switching is carried out; and a sealing surface of the No. 1 shaft seal can be flushed timely by shaft seal injection water with a relative high boron concentration in the standby column of filters, so as to improve a seal status of the sealing surface of the No. 1 shaft seal timely and effectively.

Description

technical field [0001] The invention relates to a safety maintenance method of a nuclear power plant, and more specifically relates to a method for preventing an abnormal leakage flow rate of a nuclear reactor coolant pump mechanical seal. Background technique [0002] The reactor coolant system (hereinafter referred to as RCP system) is the main circuit of the primary circuit of the nuclear power plant. Its main function is to circulate the coolant, transfer the heat generated by nuclear fission in the core to the secondary circuit through the evaporator, and cool the core at the same time to prevent Fuel elements burned or destroyed. The reactor coolant pump is referred to as the main pump for short, and each main loop of the primary loop has a main pump, which is used to drive the coolant to circulate in the RCP system. The shaft seal assembly (also known as the shaft seal system) is a key component of the main pump of the primary circuit of the nuclear reactor, and its ...

Claims

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Application Information

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IPC IPC(8): G21C17/00G21C17/022G21C17/032
CPCY02E30/30
Inventor 王勤湖刘军生洪振旻张朝文曹智鹏侯晔王春毛文军安建军袁建春张兰岐任合斌何继强
Owner GUANGDONG NUCLEAR POWER JOINT VENTURE
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