Application of remote nondestructive test methods for quality verification of grouted radioactive waste.

摘要

The Grout Disposal Program at Hanford will dispose of low level radioactive mixed wastes as a grout in near surface disposal vaults. Because of the activity level of the grouted waste, direct physical measurement of product quality is difficult. A program of remote, nondestructive testing has been initiated to verify the quality of the grouted waste produced. This paper describes the development of pulse velocity testing methods for verification of grout quality. The three methods evaluated include Ultrasonic Pulse Velocity, Crosshole Sonic Logging, and Mechanical Crosshole Seismic tests. Ultrasonic pulse velocity transducer arrays were cast into the grouted waste at known locations. The pulse velocity was measured as a function of time. Crosshole sonic logging was conducted between four tubes cast into the grout. The mechanical crosshole seismic tests utilized the same tubes, but utilized mechanical means to generate shear and compression waves. 12 figs., 3 tabs.