In legal practice, INPO refers to the Institute of Nuclear Power Operations, a US industry body that promotes high standards of safety, reliability and operational excellence in commercial nuclear power stations through peer evaluations, training and the sharing of operating experience. It is not defined in UK or Irish legislation or case law and has no regulatory authority in England & Wales, Scotland, Northern Ireland or Ireland.
INPO is commonly used as a descriptive benchmark in nuclear-related contracts and due diligence, for example in O&M agreements, procurement specifications, safety culture obligations and vendor qualification, particularly where parties operate globally or supply to US fleets. References may appear alongside, or be read consistently with, guidance from the World Association of Nuclear Operators (WANO) and international good practice.
For UK transactions and compliance, statutory obligations remain those imposed by the Office for Nuclear Regulation and environmental regulators; in Ireland (which has no operating nuclear power plants), INPO references typically arise in cross‑border supply chain and project documentation. Across the UK and Ireland, INPO materials can be cited as persuasive industry standards, but they do not create legal duties unless expressly incorporated by contract. Usage and interpretation are broadly consistent across the jurisdictions.