37. 



And then perhaps c: If there are questions that are still unan- 

 swered, what do we have to do to get answers to them? 



Because of the restrictions of classification and because of 

 certain detailed technological data that have not yet been pinned down, 

 there may be at the moment a lack of clear definition. This does not, 

 however, make the problem any less real or less serious. It is not 

 an academic problem. 



CHAIRMAN HESS: Thank you. 



Does anybody have a question he would like to ask? 



DR. M. HAWKINS: I wonder if it would be possible to have a 

 description of the cooling system in the tanks in Idaho which Dr. 

 Lieberman refers to. 



DR. LIEBERMAN: It is simply a cooling coil which is put into 

 the tank. Mr. Culler can give a more detailed answer. 



DR. F. L. CULLER: There are two systems. When the tanks 

 were first built it was not known that aluminum nitrate would attack 

 the weld in type 347 stainless steel, and it was supposed that the heat 

 would be removed during boiling by refluxing the water. The tank was 

 a standard API tank with a lower course going up to an umbrella type 

 roof. Inside it was an octagonal concrete structure. After about a 

 year and a half of exhaustive solution tests in the laboratory, it was 

 tentatively concluded that a knife line would form along the center of 

 the type 347 stainless steel, unless the temperature of the solution in 

 the tank was kept below 150 degrees Fahrenheit. This meant that boil- 

 ing cannot be tolerated and cooling must be accomplished with reflux - 

 ers. Man-holes around the periphery of the tank provide access for 

 dropping type 347 2-inch coils into the tank. Water was circulated 

 through the coils, pumped through an external cooling structure, down 

 the umbrella, and then allowed to trickle down the outside of the tank. 

 This kept the walls cool even if the center of the tank was hot. There 

 was a recirculating water system to pump extra water into the cooling 

 system if a leak occurred. There was no connection with the water 

 supply. So, it is a plain secondary heating circuit, somewhat unfortu- 

 nately designed, but effective and operating. 



QUESTION: How thick are the concrete walls? 



