Final answer:
NEI 08-09, or 'Cyber Security Plan for Nuclear Power Reactors,' was endorsed by the NRC on September 30, 2009, establishing guidelines for nuclear power plants to protect against cyber threats.
Step-by-step explanation:
NEI 08-09, titled 'Cyber Security Plan for Nuclear Power Reactors', was endorsed by the U.S. Nuclear Regulatory Commission (NRC) on September 30, 2009. The endorsement of NEI 08-09 was a significant step as it laid the groundwork for the cyber security programs that would be implemented at nuclear facilities to protect against cyber attacks and safeguard digital systems critical to the safety and operation of nuclear reactors.
NEI 08-09 reflects the collaborative efforts between the Nuclear Energy Institute (NEI) and the NRC to establish cyber security guidelines that are binding for all nuclear power plants. As a document that influences the national security posture of critical infrastructure, it is vital to the engineering and nuclear sectors.