Gaseous discharges: discharge limits and radiation doses

1 January 2000

Gaseous 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)	2.0	1.5	3.0	25	5.0	7.0	10	20	73.5
Limit in draft authorisation (TBq/year)	0.05	0.025	1.5	2.6	5.0	9.0	3.5	0.75	18	40.4
Critical group dose at draft authorisation
limit (microSv/year)	0.028	0.0071	0.26	0.14	0.48	1.2	0.51	0.066	1.0	n/a
Carbon-14
Existing limit (TBq/year)	0.2	0.6	5.0	4.0	6.0	1.5	5.0	2.4	24.7
Limit in draft authorisation (TBq/year)	0.001	0.0005	0.6	5.0	4.0	5.0	2.0	0.01	2.3	18.9
Critical group dose at darft authorisation
(microSv/year)	0.073	0.024	14	12	50	86	38	0.15	17	n/a
Sulphur-35
Existing limit (TBq/year)	0.006	0.20	0.40	0.20	0.75	0.60	0.40	0.50	3.06
Limit in draft authorisation (TBq/year)	No limit	No limit	0.19	0.15	0.17	0.45	0.35	No limit	0.45	1.76
Critical group dose at draft authorisation llimit
(microSv/year)	n/a	n/a	51	0.59	26	96	82	n/a	45	n/a
Argon-41
Existing limit (TBq/year)	No limit	No limit	1000	2000	4500	500	3000	3500	120	14,620
Limit in draft authorisation (TBq/year)	No limit	No limit	1000	1700	4000	500	3000	No limit	100	10,300
Critical group dose at draft authorisation limit
(microSv/year)	n/a	n/a	15	152	40	7.6	53	n/a	0.71	n/a
Beta particulate
Existing limit (Tq/year)	0.00002	0.0002	0.001	0.001	0.001	0.001	0.001	0.002	0.001	0.00822
Limit in draft authorisation (TBq/year)	0.00001	0.00002	0.00075	0.00055	0.0004	0.0001	0.00085	0.00005	0.001	0.00373
Critical group dose at draft authorisation limit
(microSv/year)	0.0073	0.017	0.18	0.36	0.055	0.019	0.18	0.0084	0.089	n/a
Total dose to critical group from gaseous discharges
(microSv/year)	0.11	0.048	80	165	116	191	174	0.22	64	n/a
1. At Berkeley centre, a draft limit of 100GBq/year is placed on gaseous discharges of Krypton-85. This would result in a critical group dose of 0.00011microSv/year.
2. The critical group doses for Berkeley Centre and Berkeley Station are subject to amendment following receipt of an application document from BNFL. After recalculation, the combined contribution to the critical group dose will remain small and will not exceed 1microSv/year

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