An evaluation is made of a "typical" harbor of poor flushing char- 

 acteristics. The results are summarized in the following table, which 

 gives the maximum permissible total activity for a single discharge, as 

 a function of selected values of the ppc value for the environment and the 

 maximum permissible number of discharges per month. 



The weighted mean ppc value for the inshore environment com- 

 puted for the primary coolant of the SAVANNAH is 2 x 10'^ [ic/ml, and 

 the predicted gross activity which would be contained in the warm-up 

 expansion volume from this primary coolant is 6.8 x lO'l curies. Hence 

 this "typical" harbor would be unsuitable as a receiver of warm-up ex- 

 pansion volume wastes from nuclear -powered ships having the activity 

 characteristics predicted for the SAVANNAH, 



The weighted mean ppc value for this marine environment com- 

 puted for the primary coolant of the NAUTILUS is 4 x 10'^ iJ,c/ml, and the 

 observed average activity due to the significant isotopes contained in the 

 normal warm-up expansion volume of 500 gal is 1.4 x 10"^ curies. Hence 

 apparently this "typical" harbor could receive a maximum of over 10 

 discharges per day of w^arm-up expansion volume wastes from nuclear - 

 powered ships having the activity characteristics observed for the 

 NAUTILUS. 



While relatively poor flushing characteristics were chosen for the 

 harbor used in these sample computations, they do not represent the most 

 restrictive conditions which might be encountered in marine harbors. 

 Also, because of lack of adequate data, it was not possible to include the 

 potential effect on bottom -living animals and plants, of concentration by 

 the bottom sediments. For these reasons the recommendations which 

 follow are somewhat more conservative than might otherwise be drawn 

 from the above numerical results. 



Since the total activities on the spent ion exchange resins, as pre- 

 dicted for the SAVANNAH and observed on the NAUTILUS, are 100 to 



xii 



