Spent fuel water tank liquid level and temperature measuring device

Abstract

The invention belongs to the technical field of nuke industry measurement, and particularly relates to a spent fuel water tank liquid level and temperature measuring device. The device comprises a measuring barrel with an opening in the bottom, wherein a RTD continuous liquid level sensor, a differential thermocouple discrete liquid level sensor and a thermocouple temperature sensor, which are isolated with one another, are installed in the measuring barrel along the height direction; the liquid level measuring range of the RTD continuous liquid level sensor is from the top of a fuel grillage to the full water level of a water tank, and the thermocouple discrete liquid level sensor is arranged on a set standard height level of the water tank; the RTD continuous liquid level sensor, the differential thermocouple discrete liquid level sensor and the thermocouple temperature sensor are connected with respective transmitting processing units through respective cables. The continuous liquid level, the discrete point liquid level and the temperature in the water tank are measured by adopting the three sensor elements based on different measuring principles and independent from one another, and the problem for simultaneously monitoring the continuous liquid level, the discrete point liquid level and the temperature in the water tank, caused by the failure of a common mode, can be avoided.

Description

technical field [0001] The invention belongs to the technical field of nuclear industry measurement, and in particular relates to a liquid level and temperature measuring device of a spent fuel pool. Background technique [0002] The spent fuel pool is used as a storage place for spent fuel. As long as there is spent fuel in the pool, it must be filled with water and maintain a normal water level to provide the necessary safe biological protection; hot. After the large-scale nuclear leak caused by the Fukushima earthquake on March 11, 2011, improving the state monitoring of spent fuel pools has received great attention from the nuclear safety bureaus of various countries. In the context of this demand, continuous monitoring of the state of spent fuel pools is required to ensure safety under various operating conditions of nuclear power plants, especially in accidents. [0003] After the Fukushima accident, in order to meet the monitoring requirements of spent fuel pools un...

AI Technical Summary

Problems solved by technology

Since the unit uses RTD elements for continuous level, discrete level, and continuous temperature measurements, there is a risk of common mode failure

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