Boron injection system for second reactor shutdown system of research reactor

Abstract

The invention provides a boron injection system for a second reactor shutdown system of a research reactor. The system comprises a boron liquid tank, an inlet valve, a boron injection pipe, an outlet valve and a boron liquid recovery tank, wherein a liquid outlet of the boron liquid tank is connected with a liquid inlet of the boron injection pipe through a first pipeline; a liquid outlet of the boron injection pipe is connected with a liquid inlet of the boron liquid recovery tank through a second pipeline; the inlet valve is arranged on the first pipeline; the outlet valve is arranged on the second pipeline; the boron injection pipe is arranged around a fuel assembly in the reactor. Compared with the prior art, the boron injection system for the second reactor shutdown system of the research reactor, provided by the invention, is simple in structure, quick in motion, easy to manufacture and mount, and convenient to overhaul; furthermore, the boron solution and a reactor coolant are mutually isolated, so that after the reactor shutdown function is executed, the reactor coolant is not required to be processed, and the normal operation of the reactor can be quickly restored.

Description

technical field [0001] The invention relates to the field of nuclear reactors, in particular to a boron injection system used for the second shutdown system of a research reactor. Background technique [0002] It is the most important function to ensure the safety of the reactor that the reactor can be shut down under any working conditions. For this reason, two sets of shutdown systems are usually required. In addition to being independent from each other, these two systems also require a different approach or principle. The maximum degree of difference in order to reduce the probability of common cause failure. The most commonly used method for the first shutdown system of research reactors is to drop or insert control rods, while for the second shutdown system, except for a few research reactors that can discharge heavy water as a neutron reflection layer, most research reactors still use control rods. Rod movement is used as the second shutdown means, so that the two sh...

AI Technical Summary

Problems solved by technology

The most commonly used method for the first shutdown system of research reactors is to drop or insert control rods, while for the second shutdown system, except for a few research reactors that can discharge heavy water as a neutron reflection layer, most research reactors still use control rods. Rod movement is used as the second shutdown means, so that the two shutdown systems are the same in mode or principle, which is not ideally in line with the requirements of the principle of diversity

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