Burnable absorber-integrated control rod guide thimble

Abstract

Disclosed is a burnable absorber-integrated control rod guide thimble (200) that guides an up-and-down motion of a control rod provided to control reactivity of a reactor core. The control rod guide thimble (200) includes burnable absorbers (500).

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2013-0163426 filed with the Korean Intellectual Property Office on December 26, 2013, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a control rod guide tube, in particular to a control rod guide tube integrally formed with a combustible absorber, the control rod guide tube controls the power distribution and the reaction of the reactor core. Background technique [0004] A nuclear reactor is a device that generates heat through a chain fission reaction of fuel located in the core of the reactor core. For safe and economical operation of nuclear reactors, proper management of power distribution and reactions in the reactor core is necessary. In the technical form of commercial pressurized light water reactor (commercial pressurized light water reactor), there ...

AI Technical Summary

Problems solved by technology

Therefore, it is possible to minimize distortion of core power distribution while controlling core reactions

However, injecting soluble boron into the coolant and diluting it takes time when rapid control of the reaction in the reactor core is required

Therefore, the use of boric acid does not properly control the reaction of the core

Further, a large amount of liquid waste is produced when diluting the concentration of soluble boron

Furthermore, in order to regulate the concentration of soluble boron and the water chemistry profile in the main cooling system, an expensive and complex device known as the "Chemistry and Volumetric Control System (CVCS)" is required

In addition, boron-containing water is acidic, which accelerates the corrosion of structural materials that make up the primary cooling system and ultimately reduces the operational performance of the nuclear reactor

Also, when the concentration of soluble boron in the coolant is high, the resulting coolant temperature coefficient may approach zero (0) or even become positive, which is undesirable in terms of safety

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