UK Nuclear Material Transport: A Secure Journey

The United Kingdom's Ministry of Defence (MoD) operates a highly sophisticated and secure system for the transport of Defence Nuclear Materials (DNM), a process also commonly referred to as DNM Transportation, Nuclear movements, or DNM movements. This encompasses the movement of military nuclear materials within, to, and from the UK. The utmost priority is placed on safety and security throughout these operations, involving a combination of specialised vehicles, highly trained personnel, and stringent protocols to mitigate any potential risks. The information available, though often subject to a 'Neither Confirm Nor Deny' (NCND) policy for national security reasons, reveals a comprehensive approach to safeguarding these sensitive materials.

Nuclear Weapon Transport by Road

The primary method for transporting nuclear weapons within the UK is by road, utilising a convoy system. Trident warheads, for instance, are housed within specialised packages known as PD AWG 516 packages. These are initially placed on Load Transfer Platform Trolleys (LTPT) before being moved by crane or loaded onto Truck Cargo Heavy Duty (TCHD) carriers. Consequently, these operations are frequently termed TCHD Convoys.

The evolution of TCHD carriers highlights the commitment to enhanced protection. The Mark I TCHDs were AEC Mammoth Majors. The subsequent Mark II TCHD carriers were advanced 7-axle articulated lorries, with their four-axle tractors originally manufactured by Foden. These vehicles feature cargo bodies engineered to provide superior protection for the nuclear weapon containers. The Mark III vehicle, introduced in 2011, replaced the Foden towing a similar three-axle trailer. It is a highly capable four-axle tractor based on a heavily modified Mercedes-Benz Actros, notably with its manufacturer's logo removed, underscoring the bespoke nature of these critical assets.

The most significant logistical movement of nuclear weapons involves the transfer from the Atomic Weapons Establishment (AWE) in Berkshire to the Royal Naval Armaments Depot (RNAD) Coulport in Argyll, Scotland, which is part of HMNB Clyde. Due to the necessity for continuous refurbishment of warheads, batches are transported by road convoy several times a year. These journeys are facilitated by Staging Posts (SP) and Crew Change Locations (CCL).

Convoy Composition and Escort

A typical TCHD convoy carrying nuclear weapons is escorted by a fleet of MoD vehicles, all under the command of a Ministry of Defence (MDP) Chief Inspector. The escort team is substantial, comprising up to 50 personnel. This dedicated crew includes specialists such as a first aid team, a fire crew, and personnel equipped for monitoring radiological hazards. The convoy maintains constant communication via radio and telephone with Task Control, located at the MDP Central Information Room in Wethersfield, Essex. This control centre is responsible for monitoring the convoy's progress. Additionally, liaison is maintained with the civil police forces operating within the areas the convoy traverses.

Civil police forces are provided with advance notification of at least 24 hours before a convoy is routed through their jurisdiction. This allows them to offer advice regarding any potential local traffic issues. Furthermore, police forces may inform fire brigades if a convoy is moving into proximity of an ongoing fire brigade operation.

The operational structure of these convoys involves three key organisations:

• Fleet Protection Group Royal Marines: Provide armed military personnel to counter any potential threats.
• AWE Civilian Personnel: Involved in the operational aspects of the transport.
• Special Escort Group (SEG): Responsible for close escort duties, security, and traffic management throughout the convoy's movement.

The vehicles within a convoy are specifically allocated roles:

A crucial 'Support Element' operates approximately two miles behind the main convoy. This element includes a Convoy Support vehicle, a recovery vehicle, and a coach. The AWE provides a Deputy Convoy Safety Officer who oversees this rear element.

Secrecy and Oversight

Many details pertaining to nuclear weapon convoys are classified by the Government and the MoD, adhering to a strict 'Neither Confirm Nor Deny' (NCND) policy regarding public disclosure. Information shared with the Defence Select Committee by the Nuclear Information Campaign, based on figures from Nukewatch UK for the period 2000-2006, indicated between two to six return journeys per year between Aldermaston and Coulport. Estimates suggest that during this period, approximately 88 warheads were moved from Aldermaston to Coulport, with 120 returned, implying a withdrawal of 30 to 50 warheads, leaving an operational stockpile of 150 to 170.

Tracking of the convoy is managed by the Task Control, MDP Central Information Room in Wethersfield, Essex, and the Special Safety Cell (SSC) in Ensleigh, Bath. In the event of a nuclear accident, the SSC would initiate the MoD’s Nuclear Accident Response Organisation (NARO) and immediately alert the relevant local police constabulary. The Director Nuclear Movements & Nuclear Accident Response Group (D NM&NARG) holds ultimate responsibility for these operations. All mission-critical support vehicles used in nuclear weapon transport are owned by D NM&NARG. These vehicles were originally acquired by the MoD for their then-current role from the Royal Air Force (RAF) Nuclear Weapon Convoy Group and transferred to D NM&NARG in 2002. Prior to this transfer, the RAF had commanding roles during nuclear weapon convoys.

Protests and Countermeasures

Protesters frequently attempt to disrupt these convoys, sometimes by attempting to climb onto the TCHDs. The MDP receives regular training to counter such protest activities. MDP motorcyclists and traffic car officers are authorised to make arrests, subsequently handing over responsibility to the local Police Force. For 22 years, the Aldermaston Women’s Peace Campaign (AWPC) has maintained a monthly vigil outside the fence at AWE Aldermaston. Nukewatch UK actively tracks convoys and has provided evidence to the House of Commons Defence Select Committee.

Special Nuclear Material (SNM) Transport

Special Nuclear Material (SNM) is transported within the UK primarily by road, and also by air for overseas movements. Road transport of SNM involves High Security Vehicles (HSV) escorted in a convoy of MoD vehicles, commanded by an MDP Inspector. The convoy typically comprises up to 30 personnel, including specialists equipped to handle potential accidents and monitor radiological hazards. The MDP has been involved in SNM convoys since 1978, escorting MoD's Special Nuclear Materials around the UK, with a significant portion of this work involving transport to and from the Atomic Weapons Establishment at Aldermaston.

New Reactor Fuel Transport

Reactor fuel for nuclear-powered submarines is manufactured by Rolls-Royce in Derby. From there, it is transported by road to Devonport Dockyard for installation into submarines undergoing refit. New reactor cores are also transported to BAE Systems at Barrow-in-Furness for integration into new build submarines. Infrequently, these cores are transported to the Vulcan Naval Reactor Test Establishment (NRTE) at Dounreay in northern Scotland.

New fuel is transported in the form of individual modular units, each packaged within protective containers known as New Module Containers (NMC). These NMCs are loaded onto standard road transport vehicles that travel as part of a convoy. These movements are escorted by the Ministry of Defence Police Special Escort Group (MDP SEG). Specialists travelling in separate vehicles provide crucial technical support, particularly in areas such as radiation monitoring. The convoy crew typically exceeds 20 personnel. Civil police are notified at least 24 hours in advance of a move, and the convoy commander maintains contact with them upon entering and leaving their areas of responsibility. Local fire services are informed through prior agreements.

Nuclear Weapon and SNM Transport by Air

While UK nuclear weapons are moved by road, the transport of US nuclear weapons within or through the UK is conducted by air. The Royal Air Force (RAF) maintains response teams at various bases along potential flight routes, which are placed on immediate standby during such transits. The Special Safety Cell (SSC) in Ensleigh, Bath, operates on a 24/7 basis during these flights. Only multi-engined military transport aircraft are utilised for the air transport of nuclear weapons or SNM, following meticulous route selection. Furthermore, aircraft designated for these missions undergo special safety checks and an enhanced maintenance regime to ensure operational integrity.

SNM material is flown to the United States under specific agreements. The MoD has confirmed that it transports SNM by air to the US as per the 1958 UK/US Agreement for Cooperation on the Uses of Atomic Energy for Mutual Defence Purposes. However, some non-nuclear states party to the Nuclear Non-Proliferation Treaty (NPT) have raised concerns that this movement of SNM may contravene Article I of the NPT.

Used Reactor Fuel Transport

Used reactor fuel is transported by rail from Devonport, and occasionally from the Vulcan Naval Reactor Test Establishment at Dounreay (when it was operational), to British Nuclear Fuels Limited (BNFL) at Sellafield. This used fuel is conveyed in purpose-built transport containers, designed to meet International Atomic Energy Agency (IAEA) standards. These containers are loaded onto special wagons, which can be configured for either rail or road use. A train typically carries one or two containers, each mounted on a separate wagon.

The MoD is responsible for the consignment of used reactor fuel. All movements of used fuel are escorted by the MDP SEG, who travel in two additional rail vehicles positioned at either end of the container transporter. Specialist personnel, familiar with the load and capable of providing technical support during the journey, also accompany the MDP SEG. The SEG maintains constant communication of their position to the MDP control centre in Wethersfield, and local police forces are informed in advance. The Fire Service is notified according to local agreements with the civil police.

In cases where used reactor fuel requires a short road journey to connect with the rail network, the security and safety measures employed are equivalent to those used for the road transport of new fuel. The consignment is transported in the same protective, purpose-built containers designed to IAEA standards and loaded onto the specialised wagons configured for both rail and road transport.

The Auxiliary Fire Service (AFS)

The Auxiliary Fire Service (AFS) was an organisation reformed on 29 November 1949, following the Civil Defence (Fire Service) Regulations 1949. Its role, largely unchanged from its World War II origins, was to recruit male and female volunteers to support 'Regular' Fire Brigades in combating fires caused by air raids. Established during the early years of the Cold War, and in anticipation of potential atomic and nuclear warfare, the AFS trained extensively for air attacks on the United Kingdom. This era is remembered for the distinctive green fire engines, most famously the 'Green Goddess'. While women played various roles, they were not permitted to be part of the firefighting crews. Although the AFS was never called upon to perform its primary intended role, its training activities did unfortunately result in some loss of life. The organisation, along with the Civil Defence Corps, was disbanded on 1 April 1968.

Frequently Asked Questions

Q1: Does the UK Ministry of Defence transport nuclear materials by air?
Yes, while UK nuclear weapons are primarily moved by road, the transport of US nuclear weapons and Special Nuclear Material (SNM) to the United States is conducted by air.

Q2: What is the role of the Special Escort Group (SEG)?
The SEG, part of the Ministry of Defence Police, provides close escort, security, and traffic management for convoys transporting nuclear materials. They work alongside other specialist units.

Q3: How are nuclear weapon convoys kept secure?
Convoys are highly secure, involving specialised vehicles (TCHDs), armed escorts from the MDP and Royal Marines, continuous communication with a central control room, and advance notification to civil police forces. Many details remain classified for security reasons.

Q4: What types of vehicles are used for nuclear material transport?
Specialised vehicles like Truck Cargo Heavy Duty (TCHD) carriers are used for road transport. For air transport, only multi-engined military transport aircraft are employed, subjected to special safety checks and maintenance.

Q5: Who is responsible for overseeing nuclear material transport operations?
The Director Nuclear Movements & Nuclear Accident Response Group (D NM&NARG) holds the ultimate responsibility for these operations.