FA3 is industry shorthand for Flamanville 3, the third reactor unit at EDF’s Flamanville nuclear power station in France, built to the EPR reactor design. In UK and Irish legal practice it is commonly used as a reference point in energy and infrastructure matters—especially nuclear procurement, EPC contracts, equipment supply, warranties, performance guarantees, risk allocation, and disputes.
FA3 is not defined in legislation or case law; it is a descriptive term used across the nuclear sector. Lawyers cite FA3 as a “reference plant” when benchmarking programme, cost, quality, safety and regulatory risk, including in due diligence, disclosure, expert evidence and regulatory submissions (for example, by comparison with UK EPR projects such as Hinkley Point C and Sizewell C).
Its practical significance stems from widely reported construction delays, cost overruns and remedial works at Flamanville 3, frequently invoked in drafting and litigating issues around excusable delay/force majeure, liquidated damages, caps and carve-outs, and “lessons learned” provisions.
Usage and meaning are consistent across England & Wales, Scotland, Northern Ireland and Ireland. Where precision matters, define “FA3” expressly in the relevant document to avoid ambiguity.