Passive water replenishment system for nuclear power plant spent fuel pool

Abstract

The invention relates to the technical field of containment protection in a nuclear power plant, and discloses a passive water replenishment system for a spent fuel pool in a nuclear power plant. The passive water replenishment system comprises the spent fuel pool and a water replenishment pipeline, wherein the water replenishment pipeline forms a water replenishment joint connected with an external water source; a source taking hole is formed in the sidewall of the spent fuel pool, and is connected with a liquid level monitoring mechanism through an inlet pipeline; the liquid level monitoring mechanism comprises a nuclear grade pressure transmitter for converting the pressure information of cooling water in the spent fuel pool to liquid level information, and the nuclear grade pressure transmitter is connected with an instrument control cabinet for monitoring the liquid level information of cooling water in the spent fuel pool and controlling the water replenishment pipeline to carry out water replenishment. When the spent fuel pool loses forced cooling, the water replenishment pipeline is connected with the external water source, and the cooling water cools a spent fuel, thus avoiding the release of radioactive substances; the pressure information of the cooling water can be converted into the liquid level information by virtue of the nuclear grade pressure transmitter, and is monitored by virtue of the instrument control cabinet connected to the nuclear grade pressure transmitter, and the instrument control cabinet controls the water replenishment pipeline to carry out water replenishment according to the monitored liquid level information of the cooling water.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant spent fuel pools, in particular to a nuclear power plant spent fuel water supply system. Background technique [0002] On March 11, 2013, a 9.0-magnitude earthquake occurred in the northern part of Miyagi Prefecture, Japan, and a strong tsunami was triggered, resulting in a nuclear leakage accident at units 1-4 of the Fukushima Daiichi Nuclear Power Plant located southwest of the earthquake epicenter. . Among them, units 1-3 were shut down in an emergency due to normal operating conditions, while unit 4 was shut down for maintenance, and the earthquake caused the nuclear power plant to lose power support outside the plant. machine) failure, resulting in the complete loss of functionality of the reactor cooling system and an accident at the nuclear power plant. [0003] Before the earthquake, because Unit 4 was in maintenance shutdown mode, the spent fuel pool in the nuclear power pla...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a water replenishment system for spent fuel pools of nuclear power plants, which aims to solve the problem in the prior art that when nuclear power plants are in a power-off state, it is difficult to add cooling water to the spent fuel pools, resulting in the loss of cooling of the spent fuel and causing the spent fuel to melt down serious accidents, and solve the problem that the cooling water level in the spent fuel pool cannot be monitored when the nuclear power plant is powered off

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