A calibration test device and test method for a liquid level gauge in a nuclear power plant ptr pool

Abstract

The present invention provides a nuclear power plant PTR pool liquid level gauge verification test device and its test method, the test device includes: a communication device, connected to the desalinated water system for providing water source, the communication device is provided with a plurality of connecting pipes , each connecting pipe is provided with a main needle valve; a plurality of adapters are respectively detachably sealed and installed at the bottom of the liquid level gauge, each of the adapters is connected to the connecting pipe through a water injection pipe, and the water injection pipe is also connected to the connecting pipe. A branch needle valve and a branch joint are provided, and the branch joint is arranged between the main needle valve and the branch needle valve, and each branch joint has at least one water-splitting port pair, which is used to realize the Individual level adjustment for each of said level gauges. The test method uses the test apparatus described above. The nuclear power plant PTR pool liquid level gauge verification test device and the test method provided by the present invention are not restricted by field test conditions, the test cost is lower, the test process is more flexible and efficient, and has strong popularization and application value.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant debugging, in particular to a verification test device and a test method for a liquid level gauge in a PTR pool of a nuclear power plant. Background technique [0002] PTR (Fuel pool cooling and purification system, fuel pool cooling and purification system) pool level gauge is an important device to monitor the pool liquid level to generate automatic replenishment signals and issue protection commands. According to the design requirements of the pressurized water reactor nuclear power plant, all liquid level gauges of PTR need to be compared with each other during commissioning to ensure that the reading deviation of all liquid level gauges is within the allowable error range. The current test method is to inject desalted water into the pool, all the liquid level gauges in the pool measure different liquid levels simultaneously, and check whether the measurement deviation of each liqu...

AI Technical Summary

Problems solved by technology

[0003] However, because the PTR pool level gauge adopts a large number of redundancy and "anti-common cause failure" designs, the number of level gauges that need to be cross-compared is as many as 40, and because the entire pool needs to be filled with water, the test time is long. High test cost

If there is a problem with the liquid level gauge, it is necessary to perform filling and draining operations many times, which is inconvenient for quick processing, and the cost of repeated tests is high, which seriously affects the progress of the test; on the other hand, this test plan not only occupies the main line of construction, but also has high requirements on the site environment , before the pool enters the water, it is necessary to complete the nuclear cleaning of all PTR pools, and temporarily block the holes on the pool wall. During the water intake, it is also necessary to ensure that there are no foreign objects around the pool.

However, during the commissioning stage, there is a lot of installation work in the PTR pool, the pool is not clean, there is a lot of dust and debris inside, and the test conditions are not available

Therefore, this test plan is only applicable to the periodic test after the commercial operation of the unit, and not applicable to the on-site commissioning stage before commercial operation

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