In energy and cybersecurity: the expectation that a system does not, under defined conditions, lead to a state in which human like, health, property, or the environment is endangered (NIST Special Publication 800-160 Volume 1). It also refers to the freedom from conditions that can cause death, injury, occupational illness, damage to or loss of equipment or property, or damage to the environment (NIST Special Publication 800-160, Volume 2) [Section 3(cc), DOE Department Circular No. DC2025-01-001, Institutionalizing the Energy Sector Cybersecurity and Cyber Resilience Framework]
In nuclear energy: the achievement of proper operating conditions, prevention of accidents, and mitigation of accident consequences, resulting in the protection of workers, the public and the environment from undue radiation risks [Section 5(rr), Philippine National Nuclear Energy Safety Act of 2025]