Drone Rules Near Nuclear Sites UK 2026

Why Nuclear Sites Have Special Drone Restrictions

Nuclear power stations, fuel processing facilities, waste storage sites, and military nuclear establishments are among the most security-sensitive locations in the United Kingdom. The potential consequences of an incident — whether accidental or deliberate — involving an unmanned aircraft at a nuclear site are severe enough to justify airspace restrictions that go far beyond standard CAA regulations.

The UK currently has approximately 30 nuclear licensed sites, operated by organisations including EDF Energy (operating fleet of advanced gas-cooled reactors and one pressurised water reactor at Sizewell B), Sellafield Ltd (the Sellafield reprocessing and waste management complex), Magnox Ltd (decommissioning sites), and the Nuclear Decommissioning Authority (NDA). Additionally, the Ministry of Defence operates nuclear facilities at sites including Devonport, Faslane, and the Atomic Weapons Establishment (AWE) at Aldermaston and Burghfield.

The threat from drones is taken seriously by the ONR and the Civil Nuclear Constabulary (CNC). Concerns include aerial surveillance of security arrangements, the delivery of prohibited items, disruption to operations, and the potential — however remote — for a drone to interfere with safety-critical equipment.

Restricted Airspace Around Nuclear Sites

The CAA has established Restricted Airspace (designated RA(T) — Restricted Area, Temporary, though many are effectively permanent) around nuclear licensed sites. The key characteristics of these restrictions are:

• Lateral extent: the restricted zone typically extends to a radius of approximately 2-5 kilometres from the site boundary, though the exact dimensions vary by site and are published in UK Aeronautical Information Publication (AIP) supplements and NOTAMs
• Vertical extent: restrictions typically extend from the surface to 2,000 feet above ground level (AGL), though some sites have higher limits
• Applicability to drones: the restrictions apply to all aircraft, including unmanned aircraft of any size. There is no sub-250g exemption for nuclear site restricted airspace
• Criminal offence: entering nuclear site restricted airspace without authorisation is an offence under the Air Navigation Order 2016. Penalties can include an unlimited fine and up to five years' imprisonment

ONR's Role in Drone Regulation

The Office for Nuclear Regulation (ONR) is the independent regulator responsible for nuclear safety and security in Great Britain. In the context of drone operations, the ONR's role includes:

• Security plan approval: every nuclear licensed site must have an approved security plan under the Nuclear Industries Security Regulations 2003. The plan must address the threat from unmanned aircraft, and any authorised drone operations must be incorporated into the plan
• Threat assessment: the ONR works with the Centre for the Protection of National Infrastructure (CPNI) and other intelligence agencies to assess the drone threat to nuclear sites and ensure that counter-drone measures are proportionate and effective
• Authorisation for inspection flights: when site operators wish to use drones for inspection purposes (e.g., surveying reactor buildings, inspecting cooling structures, or monitoring decommissioning progress), the ONR must be satisfied that the operation does not compromise site security

The ONR does not directly authorise drone flights — that remains the CAA's responsibility. However, the ONR's security approval is a prerequisite for the CAA to grant an Operational Authorisation for flights within or near nuclear site restricted airspace.

Authorised Drone Inspections at Nuclear Sites

Despite the severe restrictions, drones are increasingly used for legitimate inspection work at nuclear sites. Applications include:

• Reactor building surveys: external condition assessment of reactor buildings, including concrete degradation, steelwork corrosion, and roofing integrity
• Cooling infrastructure: inspection of cooling towers, ponds, and water intake structures using thermal and visual cameras
• Decommissioning support: radiological survey mapping, progress monitoring, and access to areas too hazardous for human entry
• Environmental monitoring: aerial surveys of site drainage systems, ecological mitigation areas, and boundary fence lines
• Construction monitoring: at new-build sites such as Hinkley Point C, drones provide regular progress imagery and volumetric surveys

The Authorisation Process

Obtaining permission to fly a drone at a nuclear site involves a multi-stage process:

1. Site operator engagement: the drone operator must first be commissioned by the site operator and complete the operator's contractor vetting process
2. Security vetting: all personnel involved in the drone operation must obtain the required level of security clearance. For most nuclear sites, this is Baseline Personnel Security Standard (BPSS) as a minimum, with Counter Terrorist Check (CTC) or Security Check (SC) clearance required for operations in sensitive areas
3. ONR notification: the site operator notifies the ONR of the planned drone operation through the site security team. The ONR assesses whether the operation is compatible with the site's security plan
4. CAA Operational Authorisation: the drone operator applies to the CAA for an Operational Authorisation (or variation of an existing one) that specifically covers flight within the nuclear site restricted airspace
5. Operational coordination: on the day of flight, the drone operation is managed through the site's permit-to-work system, with real-time coordination between the drone pilot, the site security control room, and the CNC

What Happens If You Fly Near a Nuclear Site Without Permission

Unauthorised drone flights near nuclear sites are treated as serious security incidents. The response typically involves:

• Detection: nuclear sites are equipped with radar, radio frequency detection, and electro-optical tracking systems capable of detecting and tracking small drones at significant range
• Response: the Civil Nuclear Constabulary (CNC) — an armed police force with specific responsibility for nuclear site security — will respond to detected drone incursions. The CNC has powers to detain individuals and seize equipment
• Investigation: the police will investigate under both aviation law (ANO 2016) and nuclear security law (Energy Act 2004). Evidence may be referred to the Crown Prosecution Service for criminal proceedings
• Penalties: conviction for entering nuclear site restricted airspace without authorisation can result in an unlimited fine and imprisonment. If the flight is deemed to have had a security purpose, charges under the Energy Act 2004 carry penalties of up to five years' imprisonment

Even if you are flying a small recreational drone and inadvertently enter the restricted zone, the consequences are serious. Always check the NATS Drone Assist app or the CAA's online airspace map before flying in any area near a nuclear site.

Counter-Drone Measures at Nuclear Sites

The UK government has invested significantly in counter-drone technology to protect nuclear sites. Whilst the specific capabilities deployed at individual sites are not publicly disclosed for security reasons, the general categories of counter-drone measures available in the UK include:

• Detection: radar systems optimised for small, slow-moving targets; RF spectrum analysers that detect drone control signals; acoustic sensors; and electro-optical/infrared cameras
• Tracking: integrated systems that combine multiple sensor inputs to track drone flight paths and identify the pilot's location
• Defeat: electronic countermeasures including RF jamming, GPS spoofing, and protocol-specific command injection. Physical countermeasures such as net-capture drones may also be deployed

The deployment of counter-drone defeat measures at nuclear sites is authorised under specific legal powers and is coordinated through the Joint Counter-Drone Authority. Legitimate drone operators flying near (but outside) nuclear site restricted zones should be aware that counter-drone systems may affect their aircraft's GPS or control link if they approach the restricted zone boundary.