Monitoring Seabrook Station

Radiological Airborne Monitoring by the C-10 Research and Education Foundation

The C-10 Radiological Monitoring Network (CRMN) program was developed in 1991 when Seabrook Station first became operational. Believing monitoring was not sufficient, citizens formed to become public watchdogs, confronting the issues of the health effects of ionizing radiation. Today, C-10 Foundation is under contract by the Massachusetts Department of Public Health to conduct monitoring in Massachusetts.

Under normal operations at a pressurized water reactor such as Seabrook Station, there are routine releases of large numbers of radioisotopes into the environment. Seabrook Station’s only monitoring of these releases, which might yield data on the magnitude and type of isotopes released, is done at the stack vent or within the plant’s various ventilation, waste, and steam-handling systems.


Offsite minute-to-minute monitoring is done by C-10 because Seabrook Station does not have continuous, real-time monitoring of plant emissions at the plant perimeter or anywhere in the populated area around the plant.

Beta, gamma, and weather data is recorded continually at 15 remote sites located within a ten-mile radius around the Seabrook Nuclear Power Plant. The data is compiled and graphed, and monthly reports are submitted to Massachusetts Department of Public Health. C-10’s data is available upon request.

Download a fact sheet, here: C-10 Monitoring -2 pager