i__t LUNITED STATES ATOMIC ENERGY COMMISSION WASHINGTON, O.C. 20543 ii December 23, 1974 Warren D. Johnsoa Lieutenant General, USAF tne a | a! orway rm Director Defeuse Nuclear Agency Washington, D. C. 20305 Dear General Johnson: Please refer to my letter of December 9, 1974, transmitting AEC comments on the Draft Environmental Impact Statement for Clean Up, Rehabilitation, Resettlement of Enewetak Atoll - Marshall Islands. It is requested that our comments be revised to include the following additional information: During the last 8 years the Nuclear Energy Agency (NEA), formerly the European Nuclear Energy Agency (ENEA), has managed an ocean disposal program for radioactive wastes bees hen. from the member countries. The following, by years, is a listing of the curies (Ci) of alpha activity in the materials so disposed. be Pu 239. 1974 1975 1972 1971 - 416 773 674 324 The alpha activity is assumed to 1970 1969 1968 1967 Total - 233 390 721 92 3633 Ci - alpha Other operations from 1949 to 1967; such as U.S. and U.K., disposed of wastes containing similar quantities of longlived alpha active materials. Thus, a total of at least 7,000 alpha Ci have been disposed of into the ocean. If we assume 15 grams of Pu per Ci alpha activity, the total is at least 100 kilograms of Pu. Thus, it is evident the disposal of a few hundred grams of Pu from Enewetak Atoll would not materially add to the alpha activity already disposed in the deep ocean. cc: HG&N Mr. Woolfenden) _ 1/8/75 AFRRI, lr. Slaback)