ATOMIC REACTOR WATER SUPPLY PIPING STRUCTURE AND ULTRASONIC FLOWMETER SYSTEM

摘要

A technology for accurately measuring with the use of an ultrasonic flowmeter the flow rate through an atomic reactor water supply piping interposed between an atomic reactor and an atomic reactor water supply pump. In reactor coolant cleaning system (30), a pipe joined with reactor water supply system (10) is branched, thereby forming auxiliary path (A) also joined with the reactor water supply system (10). The auxiliary path (A) is furnished with restriction part (C) having an inside diameter rendered smaller than in other parts of the auxiliary path (A). Thus, there is provided an atomic reactor water supply piping structure. In this structure, cavitation bubbles occur from the restriction part (C). Ultrasonic transducer (40) is disposed between atomic reactor (1) and auxiliary path (A) in the piping for constituting the reactor water supply system (10), thereby carrying out measurement of the flow rate of fluid within the piping.