In Table 4 are recapitulated from the Maritime Administration's 

 report the corrosion products expected to be present in the ion exchange 

 resins of the SAVANNAH at time of their discharge. If these are dis- 

 posed of in the open sea far from known fishing areas, and if the prob- 

 ability of two such discharges occurring in the same vicinity within a 

 period of several days is negligible, the minimum necessary dilution 



TABLE 4 



IMPORTANT CORROSION ISOTOPES IN DEMINERALIZER 

 AFTER 50 DAYS OF OPERATION, N. S. SAVANNAH 



* For disposal in open sea, in regions not designated as known fishing areas 

 (Zone 4b). 



volumes can be calculated by dividing the total activity by the ppc 

 value for the open sea, for regions not designated as knov/n fishing 

 areas. This has been done for the corrosion product isotopes for which 

 data are available. 



The report "Radioactive Waste Disposal from U. S. Naval Nuclear- 

 Powered Ships" gives information on the actual observed concentrations 

 of the various radioisotopes in the primary coolant and on the spent ion 

 exchange resins for the U.S.S. NAUTILUS. These data are reproduced 

 for the significant isotopes in Tables 5 and 6. 



The evaluation of permissible rates of discharge of nuclear wastes 

 is complicated by the fact that the potential effluents from nuclear-pow- 

 ered ships are composed of a mix of isotopes which may have additive 

 effects on man. In order to include this feature in later computations, 

 it is convenient to determine a -weighted mean ppc value for the isotope 



25 



