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The data available on the radiochemical composition and rates of discharge of the reactor cooling water have been reviewed for the period from 1951 through 1954. The degree of hazard existent has been estimated by extrapolation of these data to various points of use and comparison with maximum permissible concentrations for drinking based on absorption of the isotopes to bone or irradiation of the gastrointestinal tract. Direct dosage rates from immersion or boating were obtained by comparison with maximum permissible concentration based on dosage rates of 300 mrem per week. An operating limit for uncontrolled use as based on 10% of the radiation dose permitted for plant workers was defined. By extrapolation of the rates of output of each isotope, the river at Pasco-Kennewick was found to be at 10 to 15% of this limit for irradiation of the gastrointestinal tract and 3 to 4% for irradiation of bone during the winter months. Since the concentrations calculated in this manner are 3 to 4 times the measured concentrations, it is postulated that the gastrointestinal tract dose may be lower than quoted. The relative hazards to humans for times after discharge up to 240 hours are derived. In general, the immersion dose is highest at short times with gastrointestinal tract dose limiting at times to 10 or 20 days with bone dose limiting thereafter. Some statistical conclusions as to the variation in hazard are made. 26 refs., 16 figs., 18 tabs.