Compared to the prior art, the water quality in the steam turbine system is evaluated accurately and reliably. Among the steam turbines, a sampling pipe 22 for acquiring steam passing through a low pressure extraction pipe 12A for extracting steam from the low pressure turbine 12 having a low pressure of the supplied steam, and the steam obtained from the sampling pipe 22 The measurement results of the water quality measuring device 50 and the water quality measuring device 50 are used to measure the water quality of the steam inlet tank 32 into which the steam flows in, and the condensed water that condenses the steam flowing into the steam inlet tank 32. Thus, the water quality diagnosis device 100 for diagnosing the water quality of the condensed water is provided, the steam inlet tank 32 is installed at a higher place than the water quality measuring device 50, and the water quality measuring device 50 uses a head difference. And measure the water quality of the condensed water that has been elevated to atmospheric pressure.
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