Nuclear instrument system for nuclear power station and positioning method thereof

Abstract

The invention relates to a nuclear instrument system for a nuclear power station and a positioning method thereof. The nuclear instrument system comprises a source range channel, a middle range channel and a power range channel, wherein each channel comprises a detector arranged on the periphery of a pressure vessel; the detectors of the power range channel and the middle range channel respectively comprise a plurality of fission chambers; the plurality of fission chambers are shared by the detectors of the power range channel and the middle range channel. The fission chambers are selected as some detectors of the nuclear instrument system, so that the anti-gamma radiating capacity, anti-noise capability and anti-electromagnetic interference property are high; the fission chambers are shared, so that the quantity of the detectors is reduced and the subsequent mounting positioning workload of the detectors is reduced; furthermore, the redundancy of some channels is increased and the system reliability is promoted; 'bucket type' mounting is adopted, so that the detectors can be conveniently mounted and taken out and the staff is prevented from high irradiation; a cable connecting plate is mounted at a hoisting port of an operation platform and is away from a reactor core, so that the transmission signal is difficult to be interfered and influenced by the reactor core environment.

Description

technical field [0001] The invention relates to the field of nuclear power systems, in particular to a nuclear instrument system of a nuclear power plant and a positioning method thereof. Background technique [0002] The nuclear instrumentation system, also known as the RPN system, uses a series of detectors distributed outside the reactor pressure vessel to measure reactor power, power change rate, and radial and axial distribution of power. The currently known RPN system includes 2 source range detectors, 2 intermediate range detectors, and 4 power range detectors. Among them, the middle range detector is composed of several compensation ionization chambers, and the power range detector is composed of 6 long ionization chambers. Due to the use of compensation ionization chambers, long ionization chambers, the anti-gamma radiation capabilities of the middle range detectors and power range detectors , Anti-noise performance and anti-electromagnetic interference performance...

AI Technical Summary

Problems solved by technology

This installation and positioning method is not only cumbersome to operate, but also has a large space for installation and maintenance, and is inconvenient for operation and maintenance.

During the test maintenance during the outage and refueling period, the staff also need to receive a lot of radioactive dose of radiation. If the detector is inspected or replaced, the radiation dose received will be even greater

In addition, since the cable connection plate is very close to the reactor core, thermal expansion and contraction may easily lead to loose connections, which may cause sudden changes or loss of detector measurement signals

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