[en] The application is described of Acoustic Emission Equipment at Risley Nuclear Laboratories to the detection and location of impulsive acoustic signals from cavitation in pumps and flow circuits. The technique has been successfully applied to three systems: a static water filled centrifugal pump; an operating half scale PFR primary coolant pump and its test circuit; and the pump in an RNL sodium test loop. The results from these applications are encouraging and show that the well developed techniques of acoustic emission analysis can form the nucleus of a cavitation location system. (author)