Reactivity control method of pebble-bed high-temperature gas cooled reactor and telescopiform control rod

Abstract

The invention discloses a reactivity control method of a pebble-bed high-temperature gas cooled reactor and a telescopiform control rod. The invention discloses the telescopiform control rod arranged at a side reflective layer of a reactor and capable of realizing cold shutdown independently. The control rod comprises an inner rod, an outer rod, and a guide barrel assembly which are vertical and coaxial, wherein the outer rod and the guide barrel assembly are hollow cylindrical objects, the top end of the inner rod is capable of moving up and down in the outer rod, and the other end of the inner rod is positioned below the guide barrel assemble and is capable of moving up and down in a control rod channel coaxial with the guide barrel assembly along with the top end of the inner rod; the top end of the outer rod is capable of moving up and down in the guide barrel assembly, and the other end of the outer rod is capable of moving up and down in the control rod channel along with the top end of the outer rod. In the premise of not changing a pressure vessel height and an overall design parameter of other existing modular pebble-bed high temperature gas cooled reactors, the effective control of the control rod can be maximally improved, the reactivity value of the control rod system is improved; meanwhile, the starting and running control operation of the modular pebble-bed high-temperature gas cooled reactor are simplified, and the technological base is established for the safety and economic running of a high-temperature reactor plant.

Description

technical field [0001] The invention relates to the reactivity control of a modular pebble bed high-temperature gas-cooled reactor nuclear power plant and the design of a control rod, in particular to a method for controlling the reactivity of a pebble bed high-temperature gas-cooled reactor and a telescopic control rod. Background technique [0002] The pebble bed high-temperature gas-cooled reactor originated from the AVR experimental reactor in Germany. Based on the successful AVR reactor experiment, Germany built and operated a thorium high-temperature gas-cooled reactor with an electric power of 300MW in the 1970s, which was the period of rapid development of nuclear power in the world. Demonstration power plant (THTR-300). With the occurrence of accidents at the Three Mile Island in the United States and the Chernobyl nuclear power plant in the Soviet Union, the public and regulatory agencies in various countries have paid more and more attention to the safety of nucle...

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Problems solved by technology

[0007] The reactivity control of the above-mentioned HTR-MODUL has the following problems: ① The absorption ball shutdown system requires many functions, the system design is complex, and the operation reliability is high; , it is also necessary to blow up the absorbing balls evenly from each absorbing ball hole by means of pneumatic conveying, and the amount of absorbing balls transported each time must be accurately and controllable, which brings greater operational difficulty to reactor operators and is prone to accidents

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