Reactor core fuel sphere position measurement device of pebble-bed-type high-temperature gas cooled reactor

Abstract

The invention discloses a reactor core fuel sphere position measurement device of a pebble-bed-type high-temperature gas cooled reactor. A reactor core is a cylindrical cavity with a cone-shaped bottom, the cylindrical cavity is formed by graphite blocks in a stacking mode, the graphite blocks form side reflection layers, and fuel is a spherical body with a graphite substrate. The measurement device comprises a plurality of sphere position probes arranged on the side reflection layers at intervals, each sphere position probe is connected with an electrode lead, and the electrode leads are connected with a secondary indication instrument to display fuel sphere position information detected by the sphere position probes. The measurement device is simple in structure, stable, reliable, and capable of providing precise sphere position information in the gas cooled reactor; currently a high-temperature gas cooled experiment reactor cannot achieve the functions; electrode contact-type measurement adapts to various measurement ranges and meets requirements of the resolution ratio, the sphere position information can be directly displayed through the indication instrument, measurement circuits are obviously simplified, and stability is improved; and annular air nozzles and gas guide channels in the sphere position probes can achieve helium washing, avoid accumulation of graphite dust, and guarantee long-term operation of a measurement system.

Description

technical field [0001] The invention belongs to the field of in-core measurement of nuclear reactors, in particular to a pebble bed type high temperature gas-cooled reactor core fuel ball position measurement device. Background technique [0002] The modular pebble bed type high temperature gas-cooled reactor is an internationally recognized new generation of advanced reactors. The successful construction of the 10-megawatt high-temperature gas-cooled experimental reactor (HTR-10) under the responsibility of the Institute of Nuclear Research of Tsinghua University marks that my country has reached the world's advanced level in the field of high-temperature gas-cooled reactor technology, and has contributed to the development of nuclear energy in my country and the world. important contribution. [0003] The pebble bed type high temperature gas-cooled reactor core is a cylindrical chamber with a conical bottom, which is built by a graphite reflector. The fuel element adopts ...

AI Technical Summary

Problems solved by technology

There are many types of traditional industrial level gauges, such as resistive, inductive, capacitive, ultrasonic, and laser level sensors, but few of them can adapt to the operating conditions in the reactor and meet the requirements of nuclear-level instruments.

For example, capacitive sensors need to cooperate with complex measurement circuits in practical applications. The structure is complex and prone to failure, which does not meet the requirements of stable and reliable components in the reactor, reducing maintenance times, and avoiding radiation pollution.

Radar and ultrasonic level gauges tend to crash in high-temperature environments, and there is a lot of dust in the container, which absorbs seriously, and the interface between the material level and the air is unclear, so it cannot be used normally

In a dusty environment, after the probes of various level sensors are installed for a long time, graphite dust will adhere to the probe or between the probe and the side wall, and accumulate thicker and thicker, forming a short circuit or hindering the entry and exit of sound waves, resulting in detector failure

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