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Sellafield Fined Over Cybersecurity Breaches

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Sellafield Ltd has been fined £332,500 due to significant cybersecurity failings over a four-year period, with the prosecution led by the Office for Nuclear Regulation (ONR).

From 2019 to 2023, Sellafield’s management of its IT systems was deemed inadequate, violating the Nuclear Industries Security Regulations 2003. The vulnerabilities were considered serious, though no exploitation occurred.

The case against Sellafield Ltd serves as a critical reminder of the imperatives in maintaining robust cybersecurity frameworks, particularly within the nuclear sector.

As Sellafield Ltd moves forward with enhanced security measures, the nuclear industry as a whole is encouraged to prioritise vigilant and robust cybersecurity practices.


Sellafield Ltd’s case underscores the critical importance of stringent cybersecurity protocols in the nuclear industry. The organisation’s progress in addressing these issues is notable, yet ongoing vigilance remains paramount.

With new leadership in place, there is optimism for improved cybersecurity fortitude at Sellafield. However, regulatory bodies will continue to ensure standards are upheld to safeguard against future vulnerabilities.

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