Cold test device and method for control rod drive line of nuclear power plant

Abstract

The invention discloses a cold test device and a cold test method for a control rod drive line of a nuclear power plant. The test device comprises a pressure-bearing cylinder for simulating a reactor pressure vessel, a guide cylinder assembly, fuel assemblies, a control rod assembly and a drive mechanism. The pressure-bearing cylinder is a vessel which is formed by a top cylinder, an upper cylinder, a lower cylinder and a bottom connecting cylinder. All cylinders are sequentially and detachably connected through flanges. The test method comprises the step of replacing one or more of the top cylinder, the upper cylinder and the lower cylinder to realize the increase or decrease of the axial size of the pressure-bearing cylinder, so as to test reactor core fuel assemblies at different active section heights. Compared with the prior art, the cold test device for the control rod drive line of the nuclear power plant has the advantages that since the pressure-bearing cylinder is arranged to be a detachable structure which is formed by multiple sections, the increase or the decrease of the axial size of the pressure-bearing cylinder is realized by replacing the cylinders and the reactor core fuel assemblies at different active section heights can be tested.

Description

technical field [0001] The invention relates to a cold state test of a control rod driving line of a nuclear power plant, more specifically, the invention relates to a cold state test device and a test method of a control rod driving line. Background technique [0002] The reactor control rod driving line is an important guarantee for the safe operation of the nuclear power plant. It uses the driving mechanism arranged on the upper part of the pressure vessel to drive the control rod assembly to move up and down in the core, and controls the rapid change of the core reactivity to achieve reactor start-up, power Regulation, normal shutdown and emergency shutdown under accident conditions. Since the reliability of the function of the reactor control rod drive line is directly related to the operational safety of the reactor, it is necessary to verify the reliability of the drive line design through the cold state test of the drive line during reactor design. [0003] The whol...

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Problems solved by technology

[0004] However, the existing drive line cold test device can only be used for the test verification of the 12-foot core, and the type of the upper and lower guide cylinders can only be the 12-foot stack type; and the content of the test is only the amount of misalignment The drop speed and drop time of the lower rods cannot be used for cross-flow tests, and the impact force at the end of the drop and the transient pressure in the guide tube during the drop process cannot be measured.

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