Liquid discharges: discharge limits and radiation doses

1 January 2000

Liquid discharges: discharge limits and radiation doses
  Berkeley Berkeley     Hinkley          
Liquid Charges Centre Station Bradwell DungenessA Point A Oldbury Sizewell A Trawsfynydd Wylfa Total
Tritium                    
Existing limit (TBq/year)   8.0 30.0 35.0 25.0 25.0 35.0 12.0 40.0 210.0
Limit in draft authorisation (TBq/year)   2.0 7.0 8.0 1.2 1.0 11.0 .05 15.0 45.7
Critical group dose at draft authorisation level                    
(micoSv/year)   0.001 0.00042 0.00025 0.00066 0.000048 0.00024 0.0012 0.000091 n/a
Caesium 137                    
Existing limit (Tq/year)   0.2 0.75 1.2 1.5 0.7 1.0 0.05 § 5.4
Limit in draft authorisation (TBq/year)   0.2 0.7 1.1 1.0 0.7 1.0 0.03 § 4.73
Critical group dose at draft authorisation limit                    
(micoSv/year)   1.5 0.66 3.1 0.6 0.38 0.53 90 n/a n/a
Other radionuclides                    
Existing limit (TBq/year)   0.4 1.0 1.4 1.0 1.3 0.7 0.72* 0.15 6.67
Limit in draft authorisation (TBq/year)   0.4 0.7 0.8 0.7 0.7 0.7 0.12* 0.11 4.23
Critical group dose at draft authorisation limit                    
(microSv/year)   0.45 0.16 0.62 0.1 0.074 0.12 5.4 0.61 n/a
Strontium 90                    
Existing limit (TBq/year)   § § § § § § 0.08 § 0.08
Limit in draft authorisation (TBq/year)   § § § § § § 0.05 § 0.05
Critical group dose at draft authorisation limit                    
(microSv/year)   n/a n/a n/a n/a n/a n/a 10 n/a n/a
Total dose to critical group from liquid discharges                    
(microSv/year)   2.0 0.82 3.7 0.66 0.45 0.65 105 .62 n/a
Notes:                    
* Not including strontium 90. § Included in other radionuclides.



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