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ACOP  Approved Code of Practice
ACP   Access Control Point 
ACWP  Actual Cost of Work Performed 
AEAC United Kingdom Atomic Energy Authority Constabulary, the former name for the Civil Nuclear Constabulary (CNC).
AECL  Atomic Energy of Canada Limited
AECP  Atomic Energy Code of Practice
AEEU  Amalgamated Engineering and Electrical Union
AETP  Active Effluent Treatment Plant 
AGR Advanced Gas Cooled Reactor - A term used for the second generation of British Power Reactors, now operated by British Energy. The fuel used in the reactor is slightly enriched uranium oxide clad in stainless steel. The coolant is carbon dioxide and the moderator is graphite. The fuel is manufactured by Westinghouse Ltd at Springfields and reprocessed in THORP.
ALARA As Low As Reasonably Achievable. The ALARA principle is contained in the Euratom Basic Safety Standards Directive 96.29, which is transposed into UK Law. Essentially, it means that all reasonable steps should be taken to protect people. In making judgement, factors such as the costs involved in taking protection measures are weighted against benefits obtained, including the reduction in risks to people.
ALARP As Low as Reasonably Practicable. To satisfy this principle, measures necassary to reduce risk must be taken until the cost of these measures whether in money, time or trouble, is disproportionate to the reduction of risk. (Cm 2919) (Edwards v. National Coal Board [1949])
ANDRA  Agence nationale pour la gestion des déchets radioactifs-National agency for the management of radioactive waste
ANS  American Nuclear Society
ASB  Accounting Standards Board
ASFL  Annual Site Funding Limit - The NDA will determine the Annual SLC (Site) Funding Limit (ASFL) for each SLC based upon the funds allocated by HM Treasury. The ASFL will provide the financial constraints within which the SLC strategy, and effectively, the scope of work which can be delivered.
Attribute  Quality or inherent property belonging to or representative of a person or thing. 
AWVR Active Waste Vaults Recovery