Device for simulating graphite dust emission during break accident of high-temperature reactor and discharge testing method

Abstract

The invention provides a device for simulating graphite dust emission during a break accident of a high-temperature reactor and a discharge testing method. The device comprises a pressure injection system, a main loop pipeline system, a spray pipe discharge system and a vacuum can collection system. Based on analysis a similar principle, external air enters the main loop pipeline system through the pressure injection system to achieve a design rated value, and fine graphite dust is added into a pipeline by a dust addition system to form uniform gas dust two-phase flow under the driving of a circulating fan. By designing a spray pipe discharge pipe system vertically connected with a main loop pipeline, graphite dust is sprayed into a vacuum tank through a transonic spray pipe under the action of static pressure of main loop gas, the graphite dust in the main loop is discharged into the vacuum tank along with the air flow, and the graphite dust which is discharged into the vacuum tank is collected, so that the emission of the graphite dust of the high-temperature gas cooled reactor under accident conditions can be predicted.

Description

technical field [0001] The invention relates to a device for simulating the discharge behavior of graphite dust in the case of a breach accident in a high-temperature gas-cooled reactor and a test method for the discharge amount, belonging to the technical field of nuclear reactor engineering. Background technique [0002] In a high-temperature gas-cooled reactor, except for a small amount of fuel and control materials, the core is basically made of graphite materials, and the unique fuel ball circulation mode of the pebble bed reactor makes the fuel ball itself and other graphite components in the process of movement And the pipeline will inevitably have friction and wear, resulting in graphite dust. Part of the radioactive material in the primary circuit of the reactor may adhere to the graphite dust, and these fine graphite particles will flow with the helium flow. In the case of a break accident in the primary loop of the reactor, the graphite dust will be discharged fr...

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Problems solved by technology

[0003] However, due to the particularity of the reactor, it is unrealistic to actually measure the graphite dust emission in the case of a breach accident. Therefore, it is necessary to design other equivalent devices to simulate the emission behavior of graphite dust in the high temperature reactor under accident conditions, and to measure the emission amount of graphite dust. to test

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