Negative pressure degree adjusting method of unloading bulb tube based on spent fuel storage system

Abstract

The invention provides a negative pressure degree adjusting method of a discharging bulb tube based on a spent fuel storage system. The negative pressure degree adjusting method comprises the following steps that a discharging element flows out of a discharging device to a secondary discharging tube; the gas separator is used for dividing the gas flow at the first preset position; the unloading element flows along with the first air flow and enters the unloading element tank under the action of gravity; sucking the first air flow through a first air return valve, sucking the second air flow through a second air return valve, and shunting the air flow; the first air flow and the second air flow which are sucked are gathered together to flow to a Roots blower; part of airflow passing through the Roots blower is discharged into the atmosphere through the exhaust valve, and the other part of airflow flows back into the secondary discharging pipe. The secondary discharge pipe has the technical effects that the design is reasonable, and the secondary discharge pipe can be kept in a good negative pressure environment, so that substances such as graphite dust can be prevented from overflowing.

Description

technical field [0001] The invention belongs to the technical field of high temperature gas-cooled reactor unloading, in particular to a method for adjusting the negative pressure of a discharge bulb based on a spent fuel storage system. Background technique [0002] The high temperature gas-cooled reactor adopts the non-stop refueling mode, and the core of the high temperature gas-cooled reactor can be divided into the initial core, the transition core and the balance core according to the fuel loading state. At present, the core of high temperature gas-cooled reactor needs to be loaded into the core according to the ratio of fuel balls:graphite balls=7:8 when the core is in the initial stage of core construction, and the fuel balls or graphite balls at the bottom of the core should be unloaded at the same time. The unloading elements are unloaded, and the unloaded unloading elements are stored in the unloading device after one unloading. When the number of unloading elemen...

AI Technical Summary

Problems solved by technology

During this process, graphite dust will overflow through the assembly gap between the spent fuel loading device and the ground car shield, causing environmental pollution

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