REACTOR WATER LEVEL MEASUREMENT SYSTEM

摘要

A reactor water level measurement system including: a condensation tank connected with a steam region of a pressure vessel; a reference pipe with one end connected with the condensation tank; fluctuation pipes with one end connected with the pressure vessel; pressure difference measurement type water gauges that detect the water head difference of the reference pipe and the fluctuation pipes and that are connected with the other ends of the reference pipe and the fluctuation pipes; non-pressure difference water gauges that detect the water level of the pressure vessel; and a computation device that selects a pressure difference type water gauge or a non-pressure difference type water gauge, in accordance with a condition of the containment vessel or of the pressure vessel and that indicates/records the water level of the pressure vessel based on the detection result of the selected water gauge.

主权项

1. A reactor water level measurement system comprising:
a condensation tank connected with a steam region of a reactor pressure vessel contained in a reactor containment vessel; a reference water column instrumentation pipe whereof one end is connected with said condensation tank; a first fluctuating water column instrumentation pipe whereof one end is connected with said reactor pressure vessel; a pressure difference measurement type first water gauge that detects a water head difference of said reference water column instrumentation pipe and said first fluctuating water column instrumentation pipe and that is connected with the other ends of said reference water column instrumentation pipe and said first fluctuating water column instrumentation pipe; a second water gauge having a different construction from said first water gauge and that detects a water level of said reactor pressure vessel; and a computation device that selects said first water gauge or said second water gauge in accordance with a condition of said reactor containment vessel or said reactor pressure vessel and that indicates/records a water level of said reactor pressure vessel based on a detection result of a selected water gauge, wherein said second water gauge is arranged inside said reactor pressure vessel or outside said reactor pressure vessel and detects a water level of said reactor pressure vessel by a different system than said pressure difference system.