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| ALARP | As Low As Reasonably Practicable |
| AP | Assessment Phase |
| BNG | British Nuclear Group |
| BPEO | Best Practicable Environmental Option |
| CADMID | Concept, Assessment, Development, Manufacture, In-service Disposal |
| CIOP | Consultation on ISOLUS Outline Proposals |
| CoRWM | Committee on Radioactive Waste Management |
| COSLA | Convention of Scottish Local Authorities |
| Cut out | This term is used to refer to the option of cutting out the complete Reactor Compartment (RC), thus separating it from the rest of the submarine. The RC can then be stored intact, or cut up and packaged. |
| Cut up | This term is used to refer to the option of cutting up the Reactor Compartment and the items within it to reduce their size, so that the radioactive waste can be packaged in radioactive wastes containers and be more easily transported and stored. |
| CWE | Collaborative Working Environment |
| DA | Devolved Administrations |
| DBERR | Department of Business and Regulatory Reform (ex-Department of Trade and Industry) |
| DCB | Defence Contracts Bulletin |
| DDLP | De-Equip, De-Fuel and Lay-Up Preparations |
| DE | Defence Estates |
| DEFRA | Department for the Environment, Fisheries and Rural Affairs |
| DE&S | Defence Equipment & Support |
| DG | Director General |
| DGRP | Director General Resource and Planning |
| DfT | Department for Transport |
| DLO | Defence Logistics Organisation (a department of the MOD) |
| DNEB | Defence Nuclear Executive Board |
| DNSR | Defence Nuclear Safety Regulator |
| DSM | Director Submarines |
| DTI | Department of Trade and Industry |
| EA | Environment Agency |
| FEC | Front End Consultation – the first stage of consultation on Project ISOLUS |
| HISM | Head of In-Service Submarines |
| HSE | Health & Safety Executive |
| IAC | ISOLUS Advisory Committee |
| IAG | ISOLUS Advisory Group |
| ILW | Intermediate Level Waste |
| ISOLUS | Interim Storage of Laid-up Submarines |
| KUR | Key User Requirement |
| LLW | Low Level Waste |
| LTB | Long-Term Berthing |
| LUSM | Laid-Up Submarine |
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