66 Question 13 Do you or your colleagues have any reason to think that, due to accumulation and reconcentration in the foodchain, the "acceptasle" limits (RPG's ): may have been exceeded in the past? may presently be exceeded in some places? will bd exbeeded in the future if the use of nuclear energy increases without any new controls over the totality of waste released into the environment? Answer 13 . _ The Radiation Protection Guides of the Federal Radiation Councti present the significant factors relating potential radiation risk to man. these factors sre: Some of if a critical segments of the population, critical radio- nuclides (such as the long-lived nuclides strontium-90, cesium-137, earton-I4 and tritium and the short-lived radioiodines); ecology; total quantity of , radionuclide involved; food chains, and consideration of the actual or potential concentrations of radioactive materials in air, water or food. Thus reconcentration in food chains is considered in applying FRC guidance. There is no evidence that the Radiation Protection Guides have been exceeded in the past from peacetime uses of nuclear energy nor do we: believe that they will be exceeded in the foreseeable future due to accumulation and reconcentration of radionuclides in the food chain. There is evidence that the Radiation Protection Guides were exceeded in certain areas and years due to environmental contamination resulting from atmospheric nuclear testing. However, should this situation change, as might be indicated by the surveillance network and assessments of release of significant radionuclides | . mentioned in previous answers, it is obvious that the FRC and regulatory agencies would take suitable precautions for protecting public health and safety.