Sellafield didn't learn the lessons before the same worker got another radiation dose, regulator says Regulator finds Sellafield missed lessons before a worker received a second radiation dose
Marra Mode is how we'd tell you this in the Co-op. Switch it off for the straight version.
The nuclear regulator says Sellafield hadn't properly acted on lessons from 2022 before the same worker in the Magnox plant picked up another dose last October. It's still below the legal limit, and there'll be no enforcement action.
This one's for the Sellafield workforce and their families, and anybody in West Cumbria who keeps an eye on safety at the site.
The Office for Nuclear Regulation (ONR) has put out findings, dated Friday 16 October, about a worker in Sellafield's Magnox Reprocessing Plant who's had a second internal radiation dose, the News & Star says.
Back in 2022, the same worker took in a dose over the legal yearly limit of 20 millisieverts (mSv). Checks every year after that showed it going down like it should, but a sample in October 2025 showed they'd taken in more, most likely on 9 or 10 October 2025. That new dose came to 9.8mSv, putting their total for the year, outside exposure included, at 10.21mSv. That's under the legal limit.
Sellafield couldn't pin down exactly how it happened. But its own investigation found some lessons from 2022 hadn't been put in place properly. The ONR said "key learnings were missed and gaps continued to exist", and pointed to "inconsistencies and failures in supervision and post-job monitoring". Sellafield bumped the incident up to Level 2 on the international nuclear event scale.
The ONR's radiation expert reckons the extra health risk is about the same as a CT scan of the body. There's no sign anybody else was exposed, so the plant kept running, and the regulator decided enforcement action would be over the top. It'll keep checking things improve through its normal work.
The worker's still employed but kept out of controlled areas, and has been offered medical and radiation protection support. Sellafield says it's reviewed how people work there, tightened controls and given refresher training.
What you can do: if you work at Sellafield and you're worried, raise it with your manager, safety rep or union. The ONR puts its findings up on onr.org.uk.
The Office for Nuclear Regulation says lessons from a 2022 overexposure were not properly put in place before the same Magnox Reprocessing Plant worker took in a further 9.8mSv dose in October 2025, though it ruled out enforcement action.
This is for Sellafield's workforce and their families, and for anyone in West Cumbria who follows safety at the site.
The Office for Nuclear Regulation (ONR) has published findings, dated Friday 16 October, about a worker at Sellafield's Magnox Reprocessing Plant who received a second internal radiation dose, the News & Star reports.
The same employee had received an internal dose above the statutory annual limit of 20 millisieverts (mSv) in 2022. Annual monitoring after that showed the expected fall in radioactive material in their body, but a sample taken in October 2025 showed a new intake, most likely on 9 or 10 October 2025. The extra internal dose was calculated at 9.8mSv, bringing their total dose for the year, including external exposure, to 10.21mSv. That is below the legal limit.
Sellafield could not establish exactly how the worker took in the material. But its own investigation found that some lessons from the 2022 case had not been correctly put in place. The ONR said "key learnings were missed and gaps continued to exist", and highlighted "inconsistencies and failures in supervision and post-job monitoring". Sellafield raised the incident to Level 2 on the international nuclear event scale.
The ONR's radiation specialist judged the extra health risk to be similar to a CT scan of the torso. It found no sign that other workers had been similarly exposed, so operations were not suspended, and it decided enforcement action would be disproportionate. It will check improvements through routine regulation.
The worker is still employed but is barred from controlled areas, and has been offered medical and radiation protection support. Sellafield said its measures include reviewing working arrangements, strengthening controls and refresher training.
What you can do: Sellafield staff with concerns can raise them through their manager, safety representative or union. The ONR publishes its findings on onr.org.uk.