NOISE INHIBITOR FOR PIPING LEAKAGE DETECTOR

摘要

PURPOSE:To improve S/N ratio by forming an ultrasonic wave scattering body fixed on the surface of a piping between an ultrasonic sensor and a noise generation source through a clamp to inhibit ultrasonic waves as noise propagating through the surface thereof. CONSTITUTION:A water drum 3 is provided on a piping 2 between a reactor core and a recirculation pump 1 and an ultrasonic sensor 4, on the drum 3. The sensor 4 detects an ultrasonic wave of a released sound accompanied by a leakage 7 of a coolant at a rupture 6 which will occur at any portion of the piping 2 inadvertently to be inputted into a leakage detector 5. A noise inhibitor 8 is provided fixed at the portion of the piping close to the drum 3 between the sensor 4 and the pump 1. The device 8 is made up of a pair of split halves which are integrally fixed with bolts and nuts 11, 11... as clamping means. The inner surface 12 of the device 8 is made the same in the shape as the outer diameter of the piping 2 and concave grooves 13 are formed in such a manner as to be perpendicular to the direction of the axis thereof so that they will combine with convexes 14 relatively formed to create a scattering body 15. This can inhibit noises propagating through the surface of the piping 2 from the pump 1.