23: Environmental water analyses usually assume unidentified beta activity to be strontium-90 for this reason. £ # Comparable effort is devoted to predicting radionuclide yields from nuclear devices. For ‘both nucleur devices and reactor fuel cycle activi- -; ties, exposure estimates based on radionuclide releases are supplemented and verified by evaluations based on actual measurements. Question 1LE If this data does not exist, even an estimate, do you think we ought to start keeping such inventories? Answer We do not feel that total inventories for all radionuclides need be kept. However, there are certain radionuclides for which inventories have en . been determined so that the information would be available for research or other investigative purposes. The present approach of careful surveillance of the environment and developing data in a meaningful manner to evaluate . ' potential hazards to man is sufficient. If new and unusual potential problems present themselves, evaluations and procedures will be modified to meet the need. As the nuclear power industry grows it will continue to be AEC policy to provide long-term storage for the high-level wastes at a relatively small number of Federal repositories. For design and planning purposes, it will become increasingly important to have inventories of these types of wastes at a central point.