EDF, the company responsible for operating multiple nuclear power facilities in the United Kingdom, has come under increased regulatory scrutiny concerning its cybersecurity practices. 

This heightened attention signifies an escalation of the regulatory oversight initiated the previous year. According to the annual report from the UK's chief nuclear inspector, EDF failed to fulfill its commitment to deliver a comprehensive and adequately resourced cybersecurity improvement plan.

A spokesperson from EDF acknowledged that cybersecurity is a continually evolving concern for all organizations and emphasized their commitment to ongoing enhancement of their management processes, with the aim of eventually returning to standard regulatory scrutiny. The spokesperson also asserted that EDF's current measures pose no risk to the safety of their power stations, recognizing the significance of information security and the associated risks linked to data loss.

There is currently no concrete evidence of successful cyberattacks on British nuclear power plants. Nonetheless, earlier this year, the Intelligence and Security Committee (ISC) of the UK Parliament issued a warning regarding China's widespread cyber operations, including targeting endeavors in the civil nuclear sector. The ISC revealed that Chinese threat actors had infiltrated the computer networks of energy sector companies, with the primary focus on the non-nuclear segment, driven by China's domestic energy demand.

The specific reasons behind this new wave of regulatory scrutiny, as first reported by The Ferret, have not been disclosed to the public. EDF, a provider of energy to over five million residential and business customers, generated over £8.7 billion in revenue in 2021 but did not provide a comment when requested.

As detailed in the UK's civil nuclear cybersecurity strategy, the National Cyber Security Centre (NCSC) threat assessment highlighted ransomware as the most likely disruptive threat. While a ransomware attack on the IT systems of a nuclear power plant could disrupt its operations, these systems are designed with multiple fail-safes to prevent radiological accidents.

While cyberattacks on the operational technology systems of power plants are uncommon, they are not unprecedented, with the Triton malware in Saudi Arabia in 2017 serving as a notable example. Whether the suspected Russian actors behind such an attack could potentially circumvent the fail-safe mechanisms preventing an explosion remains unknown.

According to the UK government's National Risk Register, a cyberattack targeting the computer systems controlling a nuclear reactor might necessitate a controlled shutdown as a protective measure. While the register did not cite a risk of radiological contamination, the disruption to energy production could be protracted due to the stringent regulatory controls in place for nuclear safety and security.