Loading and temporary storage device for new fuel of pebble-bed high-temperature reactor

Abstract

The invention relates to a loading and temporary storage device for new fuel of a pebble-bed high-temperature reactor, which is provided with an upper seal end device, a barrel assembly and a bottom flange assembly in sequence from top to bottom, the barrel assembly is internally provided with a bin assembly, a conveyance mono-device is arranged under a bottom baffle, and the bottom of the conveyance mono-device and the bottom flange assembly are installed in a penetrating manner. According to the bin assembly design adopted by the loading and temporary storage device, about 800 new fuel produced by a dual-reactor core every day can be temporarily stored, the atmosphere switching time is reduced to one time from the original four times, the reliability of a fuel feed and discharge system in the discharge process can be guaranteed, and the usability of a nuclear reactor can be ensured.

Description

technical field [0001] The invention relates to a new fuel charging temporary storage device for a pebble bed high temperature reactor, in particular to a new fuel charging buffer temporary storage device for a pebble bed modular high temperature gas-cooled reactor nuclear power plant fuel loading and unloading system. Background technique [0002] The pebble bed high-temperature gas-cooled reactor uses spherical elements to pass through the core multiple times to achieve non-stop continuous operation. After a certain amount of spent fuel is discharged from the core every day, the same amount of new fuel must be added to the reactor to ensure stable Reactor power. During the loading process of new fuel, it is necessary to go through the atmosphere switching process from normal pressure air to medium pressure helium, on the one hand, to ensure the purity of helium in the fuel loading and unloading system, and on the other hand, to prevent polluted helium with radioactive dust...

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Problems solved by technology

[0005] First, it takes up a lot of space. The square spiral pipeline system is arranged on a nearly 11m high steel structure support, covering an area of ​​more than 25m 2 ; Second, the technical requirements for pipeline installation are high. There are more than ten sets of equipment and dozens of elbow pipe fittings in the square spiral pipeline, and there are strict requirements for misalignment, ellipticity and pipe section inclination angle. It is very difficult to detect seams; thirdly, the action frequency of pipeline valves is high, and the number of operations of the atmosphere switching ball circuit isolation valve exceeds 60,000 times, and the number of operations of related gas circuit valves exceeds 120,000 times. Such a high The frequency of action is an extremely severe test for the sealing of the valve and the electric device. If the life of the packing, bellows and electric device of the conventional nuclear power valve is considered (usually 2,000 to 5,000 times), it must be performed almost once a year. System outage or even shutdown for inspection, maintenance and seal replacement for more than 30 related valves, not only is it unrealistic to carry out maintenance and inspection work in the radioactive cabin environment, but also the continuous operation of the high-temperature pebble bed reactor without stacking The advantages are also difficult to make full use of; on the other hand, if the operation reliability requirements of nuclear power plant 3-5 equipment maintenance must be met, the life of the packing, bellows and electric devices of ball-way valves and gas-way-related valves must be increased to 6,000-12,000 For more than one time, with the current technical level of valve structure and spare parts, such a long life requirement is almost impossible to achieve

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