CARBON-14 MONITORING IN THE UNITED STATES
Entergy Nuclear/Pilgrim Station
This presentation was prepared for the information exchange with the
Korea Electric Power Company, which took place in February 2001. At the request of
the Korean sponsors of the information exchange, an assessment and overview of carbon-14
monitoring and dose assessment in the United States was presented. Current
regulations in Korea require monitoring and assessment of C-14 impacts, and the
presentation served as a basis for discussion of similarities and differences between
monitoring efforts in the US and Korea.
Existing regulations in the US do not require monitoring of C-14 in liquid or gaseous effluents, nor the assessment of dose impacts from such effluents. However, equations in Reg.Guide 1.109 allow for assessment of dose impact. The BWR-GALE code estimates a nominal annual release of approximately 9.5 Ci/yr from a typical BWR plant. When processed through Reg.Guide 1.109 equations, the estimated dose impact from such releases is about 2 mrem/yr. For comparison, many of the reactor sites in Korea have six operating units, and the total collective dose impact from such a multi-unit site is estimated at 12-20 mrem/yr from carbon-14 releases. This fact explains the heightened interest in C-14 methodologies in Korea.
North American Technical Center