REFUELING-CORE I, SEED 1-DISASSEMBLY INSPECTION OF CONTROL ROD DRIVE MECHANISMS. Test Results T-643711

An inspection was made of the drive mechanisms for corrosion, crud, pitting, and activity. Localized crud deposits were found in the L-5, F-12, and H-4 damper guide cup washers. Corrosion and pitting appeared slight. The gamma radiation level of the components ranged from 1 to 1900 mr/hr. Smear samples of the components indicated relatively low activity levels-the highest being 140 mr/ hr, gamma . The gamma emission spectrum for each smear sample showed the composition of all samples to be identical from Fe/sup 59/, Co/sup 60/, Mn/sup 54/ , Cr/sup 51/, Hf/sup 181/, and Zr/sup 95/. T he specific activity was highest for Co/sup 60/ (1.90 x 1O/sup 7/ dpm/mg) and lowest for Zr/sup 95/ (2.20 x 10/sup 4/ dpm/mg). (B.O.G.