Environmental Measurement Requirements Resulting from the Tmi-2 Accident

The "lessons learned" from the TMI-2 accident has resulted in expansion of the radiological monitoring requirements in and around nuclear power facilities. Additional instrument requirements, include expanded range of detection (10-6 to 105 ¿Ci/cc), broader energy response, and environs monitors are under consideration. Environs monitors are real-time exposurerate monitors with a range of 10-6 to 10 R/hr. These monitors are supplemented by TLD\´s in the environment placed by the facility operator and supplemented by additional TLD\´s placed by the State and NRC. Present considerations indicate that both active and passive environmental monitoring will be required. Active monitoring including selected area monitoring can be useful in conjunction with emergency planning and evacuation measures and routes. Both active and passive systems can be used to assess the radiological impact on the population.