Independent Environmental Monitoring Program: Darlington nuclear generating site

Publication date: June 20, 2018

Ontario Power Generation (OPG) is licensed by the CNSC to operate the Darlington nuclear generating site, located on the north shore of Lake Ontario, in the Municipality of Clarington, Ontario. OPG operates four 881 megawatt CANDU reactors and a tritium removal facility (TRF). The TRF extracts tritium from the heavy water used in the reactors to minimize the amount of tritium going into the environment, as well as reducing the potential radiation exposure of workers. OPG maintains a comprehensive environmental protection program to monitor and control radioactive and hazardous substances released from the Darlington site, determine concentrations of contaminants in the environment, and assess exposure to the public.

The Independent Environmental Monitoring Program (IEMP) results for confirm that the public and the environment around the Darlington site are protected and that there are no expected health impacts.

Legend

[ ] Guideline/Reference Level

 

Darlington nuclear generating site

Sample Type Sample Description Parameter 2017 Result 2015 Result 2014 Result Guideline/
Reference Level
Expected Health Impact (Yes/No) Background Sample Code
Water Lake water (Surface) pH 8.1 N/A N/A 6.5 - 9.0 No N/A DP01-W01
Water Lake water (Surface) Gross Alpha <0.1 Bq/L <0.03 Bq/L <0.11 Bq/L 0.5 Bq/L No N/A DP01-W01
Water Lake water (Surface) Gross Beta <0.1 Bq/L 0.08 Bq/L 0.11 Bq/L 1 Bq/L No N/A DP01-W01
Water Lake water (Surface) Cesium-137 <0.25 Bq/L <0.25 Bq/L <0.24 Bq/L 10 Bq/L No 0.00012 - 0.005 Bq/L DP01-W01
Water Lake water (Surface) Copper 3.44 µg/L N/A N/A 2 - 4 µg/L No N/A DP01-W01
Water Lake water (Surface) Zinc 1.19 µg/L N/A N/A 30 µg/L No N/A DP01-W01
Water Lake water (Surface) Tritiated water 10.1 Bq/L <3 Bq/L 4.3 Bq/L 7,000 Bq/L No 0.12 - 45 Bq/L DP01-W01
Water Lake water (Surface) Aluminum 10.52 µg/L N/A N/A 100 µg/L No N/A DP01-W01
Water Lake water (Surface) Iron 5.45 µg/L N/A N/A 300 µg/L No N/A DP01-W01
Water Lake water (Surface) Cadmium <0.10 µg/L N/A N/A 0.09 µg/L No N/A DP01-W01
Water Lake water (Surface) Cobalt-60 <0.26 Bq/L <0.29 Bq/L N/A 12.1 Bq/L No N/A DP01-W01
Water Lake water (Surface) Total Dissolved Solids 209 mg/L N/A N/A 500 mg/L No N/A DP01-W01
Water Lake water (Surface) Ammonia <0.20 mg/L N/A N/A 0.3 mg/L No N/A DP01-W01
Water Lake water (Surface) Hydrazine <0.1 µg/L N/A N/A 2.6 µg/L No N/A DP01-W01
Water Lake water (Surface) Morpholine <0.1 mg/L N/A N/A 0.004 mg/L No N/A DP01-W01
Beach Sand 0-5 cm Cesium-137 <0.7 Bq/kg dry weight 0.56 Bq/kg dry weight <0.49 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP02-SA01
Beach Sand 0-5 cm Cobalt-60 <0.8 Bq/kg dry weight <0.54 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP02-SA01
Water Lake water (Surface) Gross Alpha N/A N/A <0.11 Bq/L 0.5 Bq/L No N/A DP02-W02
Water Lake water (Surface) Gross Beta N/A N/A 0.1 Bq/L 1 Bq/L No N/A DP02-W02
Water Lake water (Surface) Cesium-137 N/A N/A <0.24 Bq/L 10 Bq/L No 0.00012 - 0.005 Bq/L DP02-W02
Water Lake water (Surface) Tritiated water N/A N/A <3.5 Bq/L 7,000 Bq/L No 0.12 - 45 Bq/L DP02-W02
Soil 0-5 cm Cesium-137 <0.7 Bq/kg dry weight 3.26 Bq/kg dry weight 8.47 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP03-S01
Soil 0-5 cm Cobalt-60 <0.8 Bq/kg dry weight <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP03-S01
Vegetation Wild Vegetation/Grass Organically Bound Tritium 5.0 Bq/kg fresh weight N/A 2.3 Bq/kg fresh weight 73,000 Bq/kg fresh weight No N/A DP03-V01
Vegetation Wild Vegetation/Grass Cesium-137 <5.0 Bq/kg fresh weight <3.2 Bq/kg fresh weight N/A 52 Bq/kg fresh weight No N/A DP03-V01
Vegetation Wild Vegetation/Grass Tritiated water 68.6 Bq/kg fresh weight N/A 5.4 Bq/kg fresh weight 10,900 Bq/kg fresh weight No N/A DP03-V01
Vegetation Wild Vegetation/Grass Cobalt-60 <5.5 Bq/kg fresh weight <3.5 Bq/kg fresh weight N/A 605 Bq/kg fresh weight No N/A DP03-V01
Air Ambient Elemental Tritium <1.9 Bq/m3 <1 Bq/m3 <2 Bq/m3 5,100,000 Bq/m3 No N/A DP04-A01
Air Ambient Cesium-137 <0.000049Bq/m3 <0.000065 Bq/m3 <0.0004 Bq/m3 2.56 Bq/m3 No N/A DP04-A01
Air Ambient Tritiated water <1.9 Bq/m3 1.9 Bq/m3 <2 Bq/m3 340 Bq/m3 No N/A DP04-A01
Air Ambient Cobalt-60 <0.000065Bq/m3 <0.000072 Bq/m3 N/A 0.832 Bq/m3 No N/A DP04-A01
Air Ambient Iodine-131 <0.00071Bq/m3 <0.00037 Bq/m3 <0.001 Bq/m3 0.228 Bq/m3 No N/A DP04-A01
Beach Sand 0-5 cm Cesium-137 <0.7 Bq/kg dry weight 0.52 Bq/kg dry weight <0.49 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP04-SA02
Beach Sand 0-5 cm Cobalt-60 <0.8 Bq/kg dry weight <0.54 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP04-SA02
Water Lake water (Surface) pH 8 N/A N/A 6.5 - 9.0 No N/A DP04-W03
Water Lake water (Surface) Gross Alpha <0.1 Bq/L 0.16 Bq/L <0.11 Bq/L 0.5 Bq/L No N/A DP04-W03
Water Lake water (Surface) Gross Beta <0.1 Bq/L 0.14 Bq/L 0.1 Bq/L 1 Bq/L No N/A DP04-W03
Water Lake water (Surface) Cesium-137 <0.25 Bq/L <0.25 Bq/L <0.24 Bq/L 10 Bq/L No 0.00012 - 0.005 Bq/L DP04-W03
Water Lake water (Surface) Copper 2.15 µg/L N/A N/A 2 - 4 µg/L No N/A DP04-W03
Water Lake water (Surface) Zinc 0.78 µg/L N/A N/A 30 µg/L No N/A DP04-W03
Water Lake water (Surface) Tritiated water 24.7 Bq/L 3.6 Bq/L <3.5 Bq/L 7,000 Bq/L No 0.12 - 45 Bq/L DP04-W03
Water Lake water (Surface) Aluminum 6.15 µg/L N/A N/A 100 µg/L No N/A DP04-W03
Water Lake water (Surface) Iron 8.61 µg/L N/A N/A 300 µg/L No N/A DP04-W03
Water Lake water (Surface) Cadmium <0.10 µg/L N/A N/A 0.09 µg/L No N/A DP04-W03
Water Lake water (Surface) Cobalt-60 <0.26 Bq/L <0.29 Bq/L N/A 12.1 Bq/L No N/A DP04-W03
Water Lake water (Surface) Total Dissolved Solids 299 mg/L N/A N/A 500 mg/L No N/A DP04-W03
Water Lake water (Surface) Ammonia <0.20 mg/L N/A N/A 0.3 mg/L No N/A DP04-W03
Water Lake water (Surface) Hydrazine <0.1 µg/L N/A N/A 2.6 µg/L No N/A DP04-W03
Water Lake water (Surface) Morpholine <0.1 mg/L N/A N/A 0.004 mg/L No N/A DP04-W03
Air Ambient Elemental Tritium <1.9 Bq/m3 <1 Bq/m3 <2 Bq/m3 5,100,000 Bq/m3 No N/A DP05-A02
Air Ambient Cesium-137 <0.000052Bq/m3 <0.000065 Bq/m3 <0.0004 Bq/m3 2.56 Bq/m3 No N/A DP05-A02
Air Ambient Tritiated water <1.9 Bq/m3 <1 Bq/m3 <2 Bq/m3 340 Bq/m3 No N/A DP05-A02
Air Ambient Cobalt-60 <0.000064Bq/m3 <0.000072 Bq/m3 N/A 0.832 Bq/m3 No N/A DP05-A02
Air Ambient Iodine-131 <0.00061Bq/m3 <0.00037 Bq/m3 <0.001 Bq/m3 0.228 Bq/m3 No N/A DP05-A02
Soil 0-5 cm Cesium-137 2.4 Bq/kg dry weight 2.31 Bq/kg dry weight 1.72 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP05-S02
Soil 0-5 cm Cobalt-60 <0.9 Bq/kg dry weight <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP05-S02
Vegetation Wild Vegetation/Grass Organically Bound Tritium 14.1 Bq/kg fresh weight N/A 10.1 Bq/kg fresh weight 73,000 Bq/kg fresh weight No N/A DP05-V02
Vegetation Wild Vegetation/Grass Cesium-137 <5.0 Bq/kg fresh weight <3.2 Bq/kg fresh weight N/A 52 Bq/kg fresh weight No N/A DP05-V02
Vegetation Wild Vegetation/Grass Tritiated water 127.6 Bq/kg fresh weight N/A 105.5 Bq/kg fresh weight 10,900 Bq/kg fresh weight No N/A DP05-V02
Vegetation Wild Vegetation/Grass Cobalt-60 <5.5 Bq/kg fresh weight <3.5 Bq/kg fresh weight N/A 605 Bq/kg fresh weight No N/A DP05-V02
Soil 0-5 cm Cesium-137 3.8 Bq/kg dry weight 2.16 Bq/kg dry weight 1.49 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP06-S03
Soil 0-5 cm Cobalt-60 <0.9 Bq/kg dry weight <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP06-S03
Air Ambient Elemental Tritium <1.9 Bq/m3 <1 Bq/m3 <2 Bq/m3 5,100,000 Bq/m3 No N/A DP07-A03
Air Ambient Cesium-137 <0.000053Bq/m3 <0.000065 Bq/m3 <0.0004 Bq/m3 2.56 Bq/m3 No N/A DP07-A03
Air Ambient Tritiated water 2.6 Bq/m3 1.8 Bq/m3 <2 Bq/m3 340 Bq/m3 No N/A DP07-A03
Air Ambient Cobalt-60 <0.000063Bq/m3 <0.000072 Bq/m3 N/A 0.832 Bq/m3 No N/A DP07-A03
Air Ambient Iodine-131 <0.00059Bq/m3 <0.00037 Bq/m3 <0.001 Bq/m3 0.228 Bq/m3 No N/A DP07-A03
Soil 0-5 cm Cesium-137 1.4 Bq/kg dry weight 1.55 Bq/kg dry weight 5.04 Bq/kg dry weight 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP07-S04
Soil 0-5 cm Cobalt-60 <0.9 Bq/kg dry weight <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP07-S04
Vegetation Wild Vegetation/Grass Organically Bound Tritium 6.5 Bq/kg fresh weight N/A 4.1 Bq/kg fresh weight 73,000 Bq/kg fresh weight No N/A DP07-V04
Vegetation Wild Vegetation/Grass Cesium-137 <5.0 Bq/kg fresh weight <3.2 Bq/kg fresh weight N/A 52 Bq/kg fresh weight No N/A DP07-V04
Vegetation Wild Vegetation/Grass Tritiated water 781.5 Bq/kg fresh weight N/A 3.3 Bq/kg fresh weight 10,900 Bq/kg fresh weight No N/A DP07-V04
Vegetation Wild Vegetation/Grass Cobalt-60 <5.5 Bq/kg fresh weight <3.5 Bq/kg fresh weight N/A 605 Bq/kg fresh weight No N/A DP07-V04
Water Lake water (Surface) pH 8 N/A N/A 6.5 - 9.0 No N/A DP07-W04
Water Lake water (Surface) Gross Alpha <0.1 Bq/L <0.03 Bq/L <0.11 Bq/L 0.5 Bq/L No N/A DP07-W04
Water Lake water (Surface) Gross Beta <0.1 Bq/L 0.08 Bq/L 0.09 Bq/L 1 Bq/L No N/A DP07-W04
Water Lake water (Surface) Cesium-137 <0.25 Bq/L <0.25 Bq/L <0.24 Bq/L 10 Bq/L No 0.00012 - 0.005 Bq/L DP07-W04
Water Lake water (Surface) Copper 1.23 µg/L N/A N/A 2 - 4 µg/L No N/A DP07-W04
Water Lake water (Surface) Zinc 1.27 µg/L N/A N/A 30 µg/L No N/A DP07-W04
Water Lake water (Surface) Tritiated water 32.2 Bq/L 4.8 Bq/L <3.5 Bq/L 7,000 Bq/L No 0.12 - 45 Bq/L DP07-W04
Water Lake water (Surface) Aluminum 4.54 µg/L N/A N/A 100 µg/L No N/A DP07-W04
Water Lake water (Surface) Iron 0.65 µg/L N/A N/A 300 µg/L No N/A DP07-W04
Water Lake water (Surface) Cadmium <0.10 µg/L N/A N/A 0.09 µg/L No N/A DP07-W04
Water Lake water (Surface) Cobalt-60 <0.26 Bq/L <0.29 Bq/L N/A 12.1 Bq/L No N/A DP07-W04
Water Lake water (Surface) Total Dissolved Solids 197 mg/L N/A N/A 500 mg/L No N/A DP07-W04
Water Lake water (Surface) Ammonia <0.20 mg/L N/A N/A 0.3 mg/L No N/A DP07-W04
Water Lake water (Surface) Hydrazine <0.1 µg/L N/A N/A 2.6 µg/L No N/A DP07-W04
Water Lake water (Surface) Morpholine <0.1 mg/L N/A N/A 0.004 mg/L No N/A DP07-W04
Water Lake water (Surface) pH 8.1 N/A N/A 6.5 - 9.0 No N/A DP08-W05
Water Lake water (Surface) Gross Alpha <0.1 Bq/L <0.03 Bq/L <0.11 Bq/L 0.5 Bq/L No N/A DP08-W05
Water Lake water (Surface) Gross Beta <0.1 Bq/L 0.07 Bq/L 0.09 Bq/L 1 Bq/L No N/A DP08-W05
Water Lake water (Surface) Cesium-137 <0.25 Bq/L <0.25 Bq/L <0.24 Bq/L 10 Bq/L No 0.00012 - 0.005 Bq/L DP08-W05
Water Lake water (Surface) Copper 4.27 µg/L N/A N/A 2 - 4 µg/L No N/A DP08-W05
Water Lake water (Surface) Zinc <0.50 µg/L N/A N/A 30 µg/L No N/A DP08-W05
Water Lake water (Surface) Tritiated water 19.4 Bq/L 5.1 Bq/L 3.6 Bq/L 7,000 Bq/L No 0.12 - 45 Bq/L DP08-W05
Water Lake water (Surface) Aluminum 2.6 µg/L N/A N/A 100 µg/L No N/A DP08-W05
Water Lake water (Surface) Iron 3.9 µg/L N/A N/A 300 µg/L No N/A DP08-W05
Water Lake water (Surface) Cadmium <0.10 µg/L N/A N/A 0.09 µg/L No N/A DP08-W05
Water Lake water (Surface) Cobalt-60 <0.26 Bq/L <0.29 Bq/L N/A 12.1 Bq/L No N/A DP08-W05
Water Lake water (Surface) Total Dissolved Solids 229 mg/L N/A N/A 500 mg/L No N/A DP08-W05
Water Lake water (Surface) Ammonia <0.20 mg/L N/A N/A 0.3 mg/L No N/A DP08-W05
Water Lake water (Surface) Hydrazine <0.1 µg/L N/A N/A 2.6 µg/L No N/A DP08-W05
Water Lake water (Surface) Morpholine <0.1 mg/L N/A N/A 0.004 mg/L No N/A DP08-W05
Foodstuffs Milk - from tank Organically Bound Tritium N/A <1.5 Bq/kg fresh weight 1.5 Bq/kg fresh weight 2,260 Bq/kg fresh weight No N/A DP09-F01
Foodstuffs Milk - from tank Cesium-137 N/A 0.39 Bq/kg fresh weight N/A 25 Bq/kq fresh weight No N/A DP09-F01
Foodstuffs Milk - from tank Tritiated water N/A 6.7 Bq/kg fresh weight 3.4 Bq/kg fresh weight 5,560 Bq/kg fresh weight No N/A DP09-F01
Foodstuffs Milk - from tank Cobalt-60 N/A <0.32 Bq/kg fresh weight N/A 11 Bq/kg fresh weight No N/A DP09-F01
Foodstuffs Apples Organically Bound Tritium 1.7 Bq/kg fresh weight <1.5 Bq/kg fresh weight <1.5 Bq/kg fresh weight 50,300 Bq/kg fresh weight No N/A DP10-F02
Foodstuffs Apples Tritiated water 12.6 Bq/kg fresh weight 7 Bq/kg fresh weight 11.9 Bq/kg fresh weight 123,000 Bq/kg fresh weight No N/A DP10-F02
Soil 0-5 cm Cesium-137 N/A 3.09 Bq/kg dry weight N/A 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP10-S06
Soil 0-5 cm Cobalt-60 N/A <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP10-S06
Soil 0-5 cm Cesium-137 3.3 Bq/kg dry weight N/A N/A 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP10-S07
Soil 0-5 cm Cobalt-60 <0.9 Bq/kg dry weight N/A N/A 14 Bq/kg dry weight No N/A DP10-S07
Vegetation Wild Vegetation/Grass Cesium-137 N/A <3.2 Bq/kg fresh weight N/A 52 Bq/kg fresh weight No N/A DP10-V06
Vegetation Wild Vegetation/Grass Cobalt-60 N/A <3.5 Bq/kg fresh weight N/A 605 Bq/kg fresh weight No N/A DP10-V06
Vegetation Wild Vegetation/Grass Organically Bound Tritium 1.6 Bq/kg fresh weight N/A N/A 73,000 Bq/kg fresh weight No N/A DP10-V07
Vegetation Wild Vegetation/Grass Cesium-137 <5.0 Bq/kg fresh weight N/A N/A 52 Bq/kg fresh weight No N/A DP10-V07
Vegetation Wild Vegetation/Grass Tritiated water 56.9 Bq/kg fresh weight N/A N/A 10,900 Bq/kg fresh weight No N/A DP10-V07
Vegetation Wild Vegetation/Grass Cobalt-60 <5.5 Bq/kg fresh weight N/A N/A 605 Bq/kg fresh weight No N/A DP10-V07
Foodstuffs Potatoes Organically Bound Tritium 2.1 Bq/kg fresh weight 2.1 Bq/kg fresh weight 1.6 Bq/kg fresh weight 121,000 Bq/kg fresh weight No N/A DP11-F03
Foodstuffs Potatoes Tritiated water 13.8 Bq/kg fresh weight 6.5 Bq/kg fresh weight 13.4 Bq/kg fresh weight 279,000 Bq/kg fresh weight No N/A DP11-F03
Foodstuffs Kale Organically Bound Tritium <1.2 Bq/kg fresh weight N/A <1.5 Bq/kg fresh weight 45,200 Bq/kg fresh weight No N/A DP11-F04
Foodstuffs Kale Tritiated water 8.8 Bq/kg fresh weight N/A 21.1 Bq/kg fresh weight 104,000 Bq/kg fresh weight No N/A DP11-F04
Foodstuffs Chicken (necks) Organically Bound Tritium N/A N/A <1.5 Bq/kg fresh weight 85,500 Bq/kg fresh weight No N/A DP11-F05
Foodstuffs Chicken (necks) Tritiated water N/A N/A 2.8 Bq/kg fresh weight 196,000 Bq/kg fresh weight No N/A DP11-F05
Foodstuffs Chicken Organically Bound Tritium 2.8 Bq/kg fresh weight N/A N/A 85,500 Bq/kg fresh weight No N/A DP11-F06
Foodstuffs Chicken Tritiated water 7.2 Bq/kg fresh weight N/A N/A 196,000 Bq/kg fresh weight No N/A DP11-F06
Foodstuffs Chicken (breast) Organically Bound Tritium N/A 10.5 Bq/kg fresh weight N/A 85,500 Bq/kg fresh weight No N/A DP11-F06
Foodstuffs Chicken (breast) Tritiated water N/A 3.1 Bq/kg fresh weight N/A 196,000 Bq/kg fresh weight No N/A DP11-F06
Foodstuffs Swiss Chard Organically Bound Tritium N/A 3.5 Bq/kg fresh weight N/A 45,200 Bq/kg fresh weight No N/A DP11-F07
Foodstuffs Swiss Chard Tritiated water N/A 7.4 Bq/kg fresh weight N/A 104,000 Bq/kg fresh weight No N/A DP11-F07
Foodstuffs Tomatoes Organically Bound Tritium <1.5 Bq/kg fresh weight <1.5 Bq/kg fresh weight N/A 45,200 Bq/kg fresh weight No N/A DP11-F08
Foodstuffs Tomatoes Tritiated water 15.9 Bq/kg fresh weight 12.4 Bq/kg fresh weight N/A 104,000 Bq/kg fresh weight No N/A DP11-F08
Soil 0-5 cm Cesium-137 4.8 Bq/kg dry weight 6.15 Bq/kg dry weight N/A 58.6 Bq/kg dry weight No 0.15 - 60 Bq/kg dry weight DP11-S05
Soil 0-5 cm Cobalt-60 <0.9 Bq/kg dry weight <0.99 Bq/kg dry weight N/A 14 Bq/kg dry weight No N/A DP11-S05
Vegetation Wild Vegetation/Grass Organically Bound Tritium 4.3 Bq/kg fresh weight N/A N/A 73,000 Bq/kg fresh weight No N/A DP11-V05
Vegetation Wild Vegetation/Grass Cesium-137 <5.0 Bq/kg fresh weight <3.2 Bq/kg fresh weight N/A 52 Bq/kg fresh weight No N/A DP11-V05
Vegetation Wild Vegetation/Grass Tritiated water 16.0 Bq/kg fresh weight N/A N/A 10,900 Bq/kg fresh weight No N/A DP11-V05
Vegetation Wild Vegetation/Grass Cobalt-60 <5.5 Bq/kg fresh weight <3.5 Bq/kg fresh weight N/A 605 Bq/kg fresh weight No N/A DP11-V05
Foodstuffs Milk - from tank Organically Bound Tritium <1.5 Bq/kg fresh weight N/A N/A 2,260 Bq/kg fresh weight No N/A DP12-F09
Foodstuffs Milk - from tank Tritiated water 3.1 Bq/kg fresh weight N/A N/A 123,000 Bq/kg fresh weight No N/A DP12-F09
Table Footnotes

1 The < symbol indicates that a result is below the provided laboratory analytical detection limit.

2 N/A – not available

3 For radiological parameters where no guidelines exist, CNSC screening levels (also known as reference levels) were established based on conservative assumptions using CSA Group Standard N288.1-14 and ICRP 119. The screening level for a particular radionuclide in a particular medium (e.g., water, air, food) represents the activity concentration that would result in a dose of 0.1 mSv/y (millisieverts/year), a dose at which no health impacts are expected.

4 Tritiated water (HTO) is a radioactive form of water where the usual hydrogen atoms in H2O are replaced with tritium. Elemental Tritium (HT) refers to the radioactive form of hydrogen gas.

Background

Under the Nuclear Safety and Control Act (NSCA), licensees of nuclear facilities are required to implement an environmental monitoring program to demonstrate that the public and the environment are protected from emissions related to the facility's nuclear activities. The results of these monitoring programs are submitted to the CNSC to ensure compliance with applicable guidelines and limits, as set out in regulations that oversee Canada's nuclear industry.

The CNSC has implemented its IEMP to verify that the public and the environment around licensed nuclear facilities are protected. It is separate from, but complementary to, the CNSC's ongoing compliance verification program. The IEMP involves taking samples from public areas around the facilities, and measuring and analyzing the amount of radioactive and hazardous substances in those samples. CNSC staff collect the samples and send them to the CNSC's state-of-the-art laboratory for testing and analysis. Since the implementation of the IEMP, the area outside of the Darlington site perimeter was sampled in 2014, 2015, and 2017.

2017 results

The 2017 IEMP sampling plan for the Darlington site focused on nuclear and hazardous contaminants. A site-specific sampling plan was developed based on OPG's approved environmental monitoring program, CSA Group standards and the CNSC's regulatory experience with the site. In 2017, samples were collected in publicly accessible areas outside the Darlington site perimeter and included water, soil and beach sand, air, vegetation, and foods such as meat, fruits, vegetables and milk from local farms. View detailed sampling data.

The radiological and non-radiological analysis in air, water, sand, soil, vegetation, as well as samples of food, was below guidelines and CNSC screening levels. CNSC screening levels are based on conservative assumptions about the exposure that would result in a dose of 0.1 mSv/year, which represents one-tenth of the CNSC's public dose limit of 1 mSv/year. No health impacts are expected at this dose level.

Past results

The 2014 and 2015 IEMP sampling plan for the Darlington site focused on radioactive contaminants. A site-specific sampling plan was developed based on OPG's approved environmental monitoring program, CSA Group standards and the CNSC's regulatory experience with the site. Samples were collected in publicly accessible areas outside the Darlington site perimeter and included water, soil and beach sand, air, vegetation, and foods such as meat, fruit, vegetables and milk from local farms. View detailed sampling data.

The radioactivity measured in air, water, sand, soil, vegetation, as well as samples of food, were below guidelines and CNSC screening levels. CNSC screening levels are based on conservative assumptions about the exposure that would result in a dose of 0.1 mSv/year. No health impacts are expected at this dose level.

Conclusions

IEMP results indicate that the public and the environment around the Darlington site are protected and that there are no expected health impacts. These results are consistent with the results submitted by OPG, demonstrating that the licensee's environmental protection program protects the health and safety of people and the environment.

To obtain the full technical IEMP report, contact us at cnsc.information.ccsn@canada.ca or call 613-995-5894 or 1-800-668-5284 (in Canada). Please provide the name of the facility and the report year.

Date modified: