The discharge of low level liquid wastes from the Sellafield site in the north west of England is the most significant source of artificial radioactivity in the Irish marine environment. Sellafield is located across the Irish Sea on the Cumbrian coast and is approximately 170 km (112 miles) from the north east coast of Ireland. The main activities at the plant include reprocessing of spent fuel from nuclear power reactors and storage of nuclear waste. The remaining two nuclear reactors at the site (the Calder Hall reactors) were closed down in March 2003 and are currently being decommissioned.
Release of Radioactivity from Sellafield into the Environment
Nuclear fuel reprocessing and other activities at Sellafield give rise to the discharge of low level radioactive materials in the form of liquids and gases into the environment. These discharges are regulated by the UK authorities and authorisation limits are set by the Environment Agency of England and Wales (EA) . The EA is required by law to report the actual discharges annually.
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Liquid radioactive waste is discharged from the plant into the Irish Sea via a pipeline, about 3 km from land. Gases are released from the plant via a number of chimneys (referred to as ‘stacks’). Discharges into the Irish Sea peaked in the mid-1970s and have dropped significantly in recent years. This is as a result of improved waste treatment facilities at Sellafield, which convert much of this radioactive waste into a solid for long-term storage.
Artificial Radioactivity in the Irish Sea
As a result of the discharges from Sellafield, low levels of artificial radioactivity can be detected in sediments, seawater, seaweeds, fish and shellfish taken from the Irish Sea. Radioactivity levels in the Irish marine environment are monitored extensively by the RPII so as to monitor the radiation dose received by the Irish population. A wide range of marine samples are collected and analysed on a regular basis. For more information on radiation monitring click here.
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The results of this monitoring are published by the RPII in an annual report and on this website. These results show that the increased radiation exposure resulting from artificial radioactivity in the Irish marine environment is very small and, even for those who consume large amounts of fish and shellfish from the Irish Sea,, this amounts to much less than 1 per cent of the total radiation dose received by a member of the Irish public from all sources of radiation.
Transporting radioactive materials by sea
Radioactive materials are routinely transported through the Irish Sea to and from Sellafield. Shipments pass through the Irish Sea to the ports of Barrow-in-Furness and Workington.
The transportation of radioactive material is carried out on vessels which adhere to safety standards set by the International Maritime Organisation. The containers used to carry the radioactive material must comply with standards set by the International Atomic Energy Agency. Click here for more information on the safe transport for radioactive material.
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