Assessment of Abnormal Radioactive Discharges in Ground Water to the Unrestricted Area at Nuclear Power Plant Sites

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The U.S. Nuclear Regulatory Commission (NRC) is issuing Regulatory Guide (RG) 4.25, "Assessment of Abnormal Radioactive Discharges in Ground Water to the Unrestricted Area at Nuclear Power Plant Sites," as a new guide (Revision 0). The guide describes an approach that the NRC staff considers acceptable for use in assessing abnormal discharges of radionuclides in ground water from the subsurface to the unrestricted area at commercial nuclear power plant sites.