- Date released: 27 March 2026
- Request number: FOI202602079
- Release of information under: FOIA
Information requested
Under the Freedom of Information Act 2000, a request was made for the full text and official document relating to the following enforcement action:
- Document type: Improvement Notice
- Reference number: ONR-IN-23-004
- Date issued: 23 January 2024 (following an incident on 23 December 2023)
- Recipient: EDF Energy Nuclear Generation Ltd
- Location: Heysham 1 Power Station
The request also included:
- The complete wording of the improvement notice, including breaches under the Pressure Systems Safety Regulations 2000 (Regulation 12: Maintenance) and the Health and Safety at Work etc. Act 1974 (section 2(1));
- The schedule or detailed list of remedial actions required to comply with the notice; and
- Any final close-out report or confirmation of compliance issued by ONR.
Our response
We confirm that under section 1 of the FOIA, we hold the information requested.
The following documents are provided:
- ONR-IN-23-004 – Operating Reactors – Improvement Notice (23 January 2024) (redacted)
- ONR-IN-23-004 Schedule – Improvement Notice Schedule (January 2024) (redacted)
- Response to improvement notice and enforcement letter (redacted)
- Letter confirming completion of works associated with the improvement notice (26 March 2024) (redacted)
- Close-out report for improvement notice (25 April 2024) (redacted)
Please note that personal data has been redacted from the documents, as its disclosure could identify individuals either directly or indirectly. This information has been withheld under section 40(2) of the FOIA.
Exemptions applied
s.40(2)
Public Interest Test
Not applicable.