Health, Safety and Environment Report 2020
Environment
Other Discharges – NORM and Drill Cuttings
Figure 21: Radioactivity Discharged to Sea
0.009
800,000
0.009
800,000
Pb-210 Activity To Sea (MBq)
Pb-210 Activity To Sea (MBq)
0.008
Ra-226 Activity To Sea (MBq)
700,000
0.008
Ra-226 Activity To Sea (MBq)
700,000
Ra-228 Activity To Sea (MBq)
0.007
Ra-228 Activity To Sea (MBq)
Naturally occurring radioactive materials (NORM) including isotopes of lead and radium are discharged to sea in produced water. The total activity discharged to sea in 2019 increased by 1 per cent, attributable to an increase in Ra226 to sea
0.007
600,000
600,000
Ra-226 Concentration (Bq/ml)
Ra-226 Concentration (Bq/ml)
0.006
0.006
Total NORM To Sea Avg Concentration (Bq/ml) Total NORM To Sea Avg Concentration (Bq/ml)
500,000
500,000
0.005
0.005
400,000
400,000
0.004
0.004
The concentration of NORM in discharged water remained steady, at 0.0037 Bq/ml, well below the notifiable threshold of 0.1 Bq/ml
300,000
Concentration (Bq/ml)
300,000
Concentration (Bq/ml) 0.003
0.003
200,000
200,000 Total NORM Activity Discharged to Sea (MBq) Total NORM Activity Discharged to Sea (MBq)
0.002
0.002
100,000
0.001
100,000
0.001
0.000
0
0.000
0
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
Source: EEMS May 2020
Source: EEMS May 2020
HEALTH, SAFETY AND ENVIRONMENT REPORT 2020
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