This standard establishes typical long-term concentrations of principal radionuclides in fluid streams of light-water-cooled nuclear power plants for use in estimating the expected release of radioactivity from various effluent streams. These fluid streams are: Boiling Water Reactor (BWR) and Pressurized Water Reactor (PWR) reactor coolant and PWR steam generator fluids. The concentrations in fluid streams of BWRs and PWRs are treated in a similar manner@ but have different numerical values because of the differences in design. The numerical values given in this standard are based on available data from operating plants which use Zircaloy clad-uranium dioxide fuel. The values are given for a set of reference conditions and guidance is provided for adjusting to other conditions. Purpose The purpose of this standard is to provide a uniform approach@ applicable to light-water-cooled nuclear power plants@ for the determination of expected concentrations in fluid streams. Through application of this standard@ a common basis for the determination of radioactive source terms for normal operating conditions is established with the goal of providing a consistent approach for those involved in the design@ licensing@ and operation of nuclear power plants. Utilization of this standard is expected to aid the licensing process and the public's understanding of the impact of nuclear power@ relative to radionuclide concentrations and possible releases to the environment. The values given in this standard will be revised periodically as additional plant operating data become available.