Abstract

A revised authorisation to discharge liquid radioactive waste from Sellafield came into effect in January 1994. The revision took account inter alia of new plant developments at Sellafield, including the Thermal Oxide Reprocessing Plant (THORP) and the Enhanced Actinide Removal Plant (EARP). The revised authorisation included reduced discharge limits for radionuclides of greatest radiological significance, such as 106 Ru, 137 Cs and the transuranics. To allow operation of new plants, increased limits were allowed for some nuclides of low radiological significance, including 3 H, 14 C, 99 Tc and 129 I. Changes in discharges of radionuclides are described, together with selected results from a comprehensive programme of aquatic environmental monitoring. The trends in monitoring results over the period 1990-96 are related to changes in discharge patterns. The effects in terms of radiological significance to the potentially critical group of fish and shellfish consumers are presented, showing the changes in contributions due to different radionuclides.

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