Regular bed modular high temperature gas cooled reactor and its fuel sphere disposal method

Abstract

A regular bed modular high temperature gas cooled reactor and its fuel ball disposition method in the field of nuclear reactor technology. In the reactor,heluim is arranged inside the graphite block reflector. The control rod and the absorbing small ball are positioned inside the graphite block reflector. Fuel balls are arranged on the level of the graphite block reflector hollow cavity,in the form of square array,the center cave formed by each four balls can be used as the location of the second layer ball so as to form the regular bed,and the up end and the bottom end of the bed are graphite block reflectors.

Description

technical field [0001] The invention relates to a regular-bed modular high-temperature gas-cooled reactor and a method for arranging fuel balls thereof, belonging to the technical field of nuclear reactors. Background technique [0002] The high-temperature gas-cooled reactor is an advanced nuclear reactor type recognized internationally with good safety, high power generation efficiency and wide application. Due to the use of high-temperature-resistant ceramic-type coated particles as fuel, inert gas helium as coolant, and graphite as moderator and core structure material, it can generate high temperatures above 950 degrees, not only high-efficiency power generation, but also in coal It has broad application prospects in gasification, liquefaction and hydrogen production. [0003] The emergence of modular high-temperature gas-cooled reactors in the 1990s has made great progress in this technology. The modular high-temperature gas-cooled reactor is characterized by miniatu...

AI Technical Summary

Problems solved by technology

However, the fuel balls piled up randomly move from top to bottom in the core, and cannot obtain the best power and temperature distribution. Although the fuel balls pass through the core more than 10 times on average before becoming spent fuel, the axial and radial The power non-uniformity coefficient is very large, so that within the limited volume of the modular reactor, the maximum output thermal power of the reactor can only reach about 400 megawatts

Coupled with the high flow resistance of the pebble bed core coolant, when the helium turbine is used for direct cycle power generation, the high-efficiency measures to reduce the temperature difference and increase the flow rate are limited, so the net power generation efficiency is only about 41%.

The block reactor not only has a thermal power output of 600 MW, but also has a net power generation efficiency of about 47%. The electrical power output of the two modular high-temperature gas-cooled reactors is quite different.

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