| 摘要 |
PURPOSE: To raise reliability by arranging a plurality of sensors for measuring process parameters indicative of a loss of pump suction, determining whether or not conditions leading to a loss of pump suction are present and protecting a pump automatically. CONSTITUTION: An automatic pump protection system 19 provided to associate with a residual heat removal system(RHRS) 20 for recycling and cooling cooling water from a reactor cooling system(RCS) 21 of a nuclear power plant comprises an MPU 42 for inputting outputs for a fluid level sensor 33, pressure sensors 34, 35 a temperature sensor 36 and a fluid flow rate sensor 37. In the MPU 42, the lowest level of the fluid upstream of an outlet of the RCS 21 for ensuring that no air is mixed into the system is obtained. Whether the lowest level is above the RCS fluid level or not is determined. If it is NO, an analysis as to whether or not there is the possibility that air may be adjoint is conducted. If there is the possibility that air may be adjoint, protection measures such as tripping a valve 23, etc., is conducted.
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