Patent Number: 048266507
Section: claims

1. A process of testing a top guide assembly in a boiling water reactor having a horizontally disposed lattice constructed of orthogonally intersecting bars defining discrete cells for orienting fuel assemblies at their respective ends in vertically disposed spaced apart relation, said process comprising the steps of: removing the fuel assemblies adjoining the bars to be tested;  providing a first transducer emanating a vertical ultrasound signal;  sweeping said first transducer horizontally along the top side edge of a bar to interrogate said bar with vertical ultrasound signals to detect cracks in said bar having horizontal components;  providing a second transducer emanating horizontal ultrasound; and,  sweeping said second transducer vertically along the side edge of said bar to detect cracks having vertical components in said bar.  providing a third transducer emanating horizontal ultrasound at an opposite angle with respect to said second transducer;  sweeping said third transducer with said second transducer vertically along the side edge of said bar to detect cracks having vertical components in said bar. 2. The process of claim 1 and wherein said second transducer emanates horizontal ultrasound at an angle with respect to the side of said bar. 3. The process of claim 2 and wherein said angle is an angle of incidence of 70.degree. with respect to the side of said bar. 4. The process of claim 2 and including: 5. The process of claim 4 and wherein said second and third transducers emanating horizontal ultrasound have angles of incidence towards one another into said bar to interrogate said bar with ultrasound in opposite directions.