The U.S. Nuclear Regulatory Commission (NRC) is a strong regulator in this area. The NRC’s efforts to create a cyber security regulatory framework for the plants began shortly after September 11, 2001. The NRC issued orders after September 11 that required power reactor licensees to implement interim compensatory measures to enhance cyber security at their sites. These security measures required an assessment sufficient to provide protection against the cyber threats at the time of the orders. Subsequently, the NRC amended the Design Basis Treat requirements to include cyber attacks. In 2009 the NRC ammended their extensive physical protection program regulations to include specific requirements for a cyber security program to protect systems that, if compromised, would adversely impact safety, security or emergency preparedness.
So what does all of this mean? What have the plants actually done to implement cyber security protective measures in response to the cyber threat?
Every plant submitted a cyber security plan to the NRC that describes how the plant will implement their cyber security program. The NRC has reviewed and approved each of these plans.
Each plant also submitted an implementation schedule describing the interim milestone actions toward full implementation of the cyber security program. The NRC has reviewed and approved each of these schedules. The interim milestones of the schedule prioritize key activities designed to address the most prominent cyber threats to these facilities.
By December 31, 2012, each U.S. nuclear power plant has:
- Isolated key control systems using either air-gaps or robust hardware based isolation devices. As a result, the key safety, security, and power generation equipment at the plants are protected from any network based cyber attacks originating outside the plant.
- Enhanced and implemented robust controls over the use of portable media and equipment. Where devices like thumb drives, CD’s, and laptops are used to interface with plant equipment, measures are in place to minimize the cyber threat. These measures include such actions as: minimizing the use of devices that are not maintained at the plant; virus scanning devices both before and after being connected to plant equipment; and, implementing additional measures where the source of the data or device originates outside the plant. As a result, the plants are well protected from attacks like Stuxnet, that propagated through the use of portable media.
- Enhanced defenses against the insider threat. Training and insider mitigation programs have been enhanced to include cyber attributes. Individuals who work with digital plant equipment are subject to increased security screening, cyber security training, and behavioral observation.
- Implemented cyber security controls to protect equipment deemed most essential for the protection of the public health and safety. While full implementation of cyber security controls for all digital equipment requiring protection will take some time, plants have prioritized the implementation to cover the assets most essential to the public health and safety.
- Implemented measures to maintain the effectiveness of the implemented portions of the program. These measures include maintaining the equipment described above in the plant configuration management program, ensuring changes to the equipment are performed in a controlled way. A cyber security impact analysis is performed before making changes to the equipment. The effectiveness of implemented cyber security controls is periodically assessed, and enhancements made where necessary. Vulnerability assessments are performed to ensure the cyber security posture of the equipment is maintained.
The balance of the implementation of the cyber security program is ongoing. And I look forward to keeping the readers of the blog up-to-speed on advancements.
No cyber security program will be 100% perfect. These interim measures well position the plants to ensure that the public health and safety are maintained, and that the sites will reliably continue to make their significant contribution to the nation’s electrical supply.