418 



SUDE No. 13 ' 



This slide shows a close-up of the concrete end of the waste 

 package. Most of the radioactive wastes were packaged in 55-gallon 

 drums. The top of the drum was cut off; the waste was put inside; 

 and concerete was poured around and over the waste to make a 

 solid matrix. 



What we can see here in this slide is that the concrete shows 

 very little evidence of spallation or cracking. There is some surface 

 dissolution of the concrete material. The cylindrical hole in the 

 center of the concrete is where the radioactive waste is located, in 

 this case a piece of iron pipe embedded or set into the drum with 

 concrete poured around it. It doesn't show up too clearly in the 

 slide here, but the drum has been perforated along the chime area 

 by sea water corrosion. 



This corrosion is expected where you have both sides of the 

 metal exposed to seawater, since seawater is very corrosive. 



Where the drum has only been exposed on one surface, there has 

 been very little corrosion. 



Next slide, please. 



(Slide No. 14.) 



