Nuclear Fire Engineering
The highest consequence environments demand the most rigorous fire engineering. From existing licensed sites to new-build reactors — rigorous, standards-based analysis.
Nuclear facilities represent the ultimate fire safety challenge. The consequences of failure are not merely financial — they are radiological, environmental, and reputational on a national scale. Magnus Opifex Seven provides fire hazard analysis input within a safety-case framework owned by the licensee. The licensee holds the safety case and the regulatory relationship with the Office for Nuclear Regulation; we are not a regulator and do not determine regulatory acceptability.
Key Challenges
Nuclear Safety Case
Developing fire safety elements of nuclear safety cases including ALARP demonstrations, fault schedule entries, and safety function claims.
Deterministic Fire Hazard Analysis
Systematic identification and assessment of fire hazards using deterministic methods aligned with ONR guidance (NS-TAST-GD-051).
ONR Regulatory Compliance
Meeting Office for Nuclear Regulation expectations for fire safety in nuclear licensed sites and authorised defence sites.
Radioactive Contamination Spread
Fire strategies that prevent fire-driven dispersal of radioactive contamination — a unique nuclear-specific challenge.
Decommissioning Fire Safety
Managing fire risks during nuclear decommissioning where building conditions, fire loads, and access are constantly changing.
Defence in Depth
Implementing multiple independent layers of fire protection aligned with nuclear safety's defence-in-depth philosophy.
Our Services
What makes nuclear fire safety different
The governing consequence is not only life safety: a fire that disturbs containment or a safety function has radiological consequences that no conventional building strategy addresses.
Argument has to be documented to safety-case standards, which means assumptions, faults and claims must be traceable rather than merely reasonable.
Decommissioning environments change continuously, so a fire-safety position taken six months ago may no longer describe the building.
Who we usually work with
- ·Licensee safety-case and engineering teams
- ·Tier-1 contractors delivering on licensed sites
- ·Decommissioning programme managers
- ·Site fire-safety and assurance leads
Which requirements typically apply, and how
Nuclear site licensing regime
Nuclear licensed sites are regulated by the Office for Nuclear Regulation. Magnus Opifex Seven is not a regulator and does not determine regulatory acceptability; the licensee owns the safety case.
Regulatory Reform (Fire Safety) Order 2005, as amended by the Fire Safety Act 2021
Applies to relevant premises in England and Wales alongside — not instead of — the nuclear regime.
Building Regulations and Approved Document B
Applies to building work on site in the normal way; the safety-case route is additional.
Applicability is confirmed for the specific building. This is technical fire-safety consultancy and not legal advice; legal interpretation is a matter for your own advisers.
What you can instruct — and what is excluded
Scoped deliverables
- Fire hazard analysis input within a defined, client-owned safety-case framework
- Fire strategy for conventional buildings and support facilities on site
- Compartmentation and protection-measure review
- Fire risk assessment for relevant premises
- Technical review and independent challenge of fire-safety submissions, where instructed
Boundaries of the work
- ·We do not own, submit or approve a nuclear safety case; the licensee holds the safety case and the regulatory relationship.
- ·Site access, security vetting and information-handling arrangements are set by the licensee and must be in place before any work begins.
- ·Radiological consequence assessment is carried out by the client's radiological specialists.
- ·This is technical fire-safety consultancy. Magnus Opifex Seven is not a building control authority, not the Building Safety Regulator, and not a certification body.
- ·We do not take on Responsible Person, Accountable Person, Principal Designer or Principal Contractor duties, and no approval outcome, programme or cost is guaranteed.
- ·British Standards and PAS documents are standards and guidance, not legislation; where they are referenced the statutory position is stated separately.
- ·We do not issue or sign EWS1 forms. EWS1 is a valuation-related form for lenders and is not a life-safety certificate or a fire risk assessment.
- ·Scope, fees and programme are confirmed in a written quotation once the building information is reviewed.
What we need to scope your enquiry
Information needed
- ·Facility type and its position in the site's safety-case hierarchy
- ·Whether the work is operational, modification or decommissioning
- ·The access and vetting arrangements that would apply
- ·The specific fire-safety question the licensee needs answered
Useful reference
Scope a nuclear-sector enquiry
Tell us the facility type, the phase and the exact question. You get a written scope that states what we can support and what remains with the licensee.
Discuss a nuclear-sector enquiry
Ready to Discuss Your Nuclear Project?
Tell us about the building and the fire-safety question you need answered. We confirm what is in scope, what evidence is missing, and the fee — in writing, before work begins.