Loading and unloading device and method for fuel ball of high-temperature gas cooled reactor

Abstract

The invention discloses loading and unloading device and method for a fuel ball of a high-temperature gas cooled reactor, a bottom outlet of a reactor pressure vessel is communicated with an inlet of a loading control valve group, an outlet of the loading control valve group is communicated with an inlet of a burnup measuring device, and an outlet of the burnup measuring device is communicated with an inlet of an unloading control valve group; a first outlet of the discharging control valve group is communicated with an inlet of the fuel storage system and an inlet of the rotatable charging device, a second outlet of the unloading control valve group is communicated with an inlet of the fuel storage system, an outlet of the rotatable charging device is communicated with an inlet of the reactor pressure vessel, and an outlet of the fuel storage system and an outlet of a new fuel tank are communicated with an inlet of the loading control valve group. According to the device and the method, the neutron flux distribution of the reactor core can be flattened, and the safety and the economy of the reactor are improved.

Description

technical field [0001] The invention belongs to the field of nuclear reactor fuel loading and unloading, and relates to a loading and unloading device and method for high-temperature gas-cooled reactor fuel spheres. Background technique [0002] The fuel pellets of the pebble bed high-temperature gas-cooled reactor have to go through the internal and external circulation of the reactor many times during normal operation. The current fuel loading and unloading system divides the fuel into two types: spent fuel pellets and recycled fuel pellets. The fuel consumption depth is distinguished, and the refueling process is to directly transfer the recyclable fuel balls and newly loaded new fuel balls back to the core, and randomly fall into the pebble bed. [0003] As long as the burnup depth of recycled fuel balls is less than 80000MW / tU, they will recirculate into the reactor core. From the new fuel balls with 0MW / tU burnup to 80000MW / tU recycled fuel balls, after passing through...

AI Technical Summary

Problems solved by technology

[0003] As long as the burnup depth of recycled fuel balls is less than 80000MW / tU, they will recirculate into the reactor core. From the new fuel balls with 0MW / tU burnup to 80000MW / tU recycled fuel balls, after passing through the fuel loading and unloading system, they will be randomly discharged from the reactor The charging port falls into the core. This undiscriminated random ball falling behavior will inevitably lead to an asymmetric distribution of the radial power of the core during the daily operation of the unit. In severe cases, it may lead to serious radial power deflection.

In addition, the axial power distribution of the core also has a large randomness. How to flatten the neutron flux distribution of the core and improve the safety and economy of the reactor has become a difficult problem in the industry.

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