Safety culture in the nuclear context is not a program or a policy — it is the product of how an organisation consistently behaves when safety and other pressures compete. IAEA GSR Part 2 Requirement 1 establishes that leadership and management must demonstrate that safety is the overriding priority. CNSC REGDOC-2.1.2 sets out Canadian regulatory expectations for safety culture. In the US, 10 CFR 50.7 provides the legal non-retaliation protections that make safety culture behavioural expectations enforceable. The three practical expressions of safety culture — stop work authority, a questioning attitude, and non-retaliation for raising concerns — are where these principles meet daily work.
What safety culture means in practice
The IAEA definition describes safety culture as the assembly of characteristics and attitudes in organisations and individuals that establishes that, as an overriding priority, nuclear plant safety issues receive the attention warranted by their significance. The key phrase is "overriding priority." Safety culture is tested precisely in those moments when safety requirements impose costs, delays, or inconvenience — and the measure of the culture is whether safety is treated as non-negotiable even then.
Safety culture is distinct from compliance. An organisation can be fully compliant with every regulatory requirement while having a weak safety culture: one where workers do not raise concerns, where problems are managed at the lowest level to avoid visibility, where the formal QA program and the actual practice diverge. Conversely, a strong safety culture actively reinforces compliance by creating an environment where deviations are surfaced and corrected before they become violations.
Regulators assess safety culture not by reviewing the safety culture policy document, but by examining organisational behaviour: how the corrective action program is used, whether concerns are raised and taken seriously, how management responds when safety and schedule conflict, and whether workers at all levels understand and apply their stop work authority. A safety culture finding from a regulatory inspection is among the most serious types of findings because it indicates a systemic organisational condition rather than an isolated procedural failure.
Stop work authority
Stop work authority is the right and obligation of any worker — regardless of role or seniority — to halt work when they identify an unsafe condition, an apparent violation of a procedure, or a situation they do not understand and cannot resolve. It is not a suggestion or a discretionary option. NQA-1 Requirement 1 §300 establishes that the QA program must provide workers with the authority to identify quality problems and initiate, recommend, or provide solutions.
A stop work must be documented. When a worker exercises stop work authority, the condition that prompted the stop must be entered into the corrective action program, evaluated, and resolved before work resumes. This documentation requirement serves two purposes: it creates a record of the condition for evaluation and trending, and it prevents stop works from being quietly reopened without proper resolution.
Stop work must be non-punitive to be effective: If workers who exercise stop work authority experience negative consequences, including informal pressure, reassignment, performance review impacts, or social ostracism, the authority becomes theoretical. The measure of an organisation's stop work program is not how many stop works are exercised but whether workers believe they can exercise it without fear. 10 CFR 50.7 provides federal legal protection against discrimination for raising nuclear safety concerns, including stop works.
Management response to stop works is the primary signal workers use to calibrate whether their concerns are genuinely welcomed. If a stop work results in a thorough evaluation and, where warranted, a genuine improvement, workers learn that raising concerns is valued. If stop works are routinely closed as "no issue found" without meaningful investigation, or if workers observe that those who raise concerns are treated differently from those who do not, the culture signal is clear.
Questioning attitude
A questioning attitude is the individual behaviour that feeds a strong safety culture. It means that workers do not proceed when something does not look right, do not assume that an apparent deviation is intentional or acceptable, and do not remain silent when they observe a condition that concerns them. In nuclear QA, a questioning attitude is not a personality trait — it is a professional obligation.
Questioning attitude is most important at interfaces: when work is handed off between shifts or crews, when a procedure step does not match the physical condition of the equipment, when a drawing does not agree with the as-built configuration, and when an instruction is ambiguous. These are the moments when the gap between what was intended and what is actually happening becomes visible, and a questioning attitude is what closes that gap before it becomes an event.
Organisations foster questioning attitude by making it safe to ask questions and to say "I don't understand" or "this doesn't look right." Pre-job briefings that explicitly invite questions, peer checking practices, and management walk-downs that model curiosity rather than audit create the conditions where a questioning attitude can function as a real safety barrier.
Regulatory framework and non-retaliation
In the US, 10 CFR 50.7 prohibits nuclear licensees from discriminating against employees who raise safety concerns, refuse to engage in activities they believe violate NRC regulations, or testify or provide information to the NRC. The NRC's differing professional opinion (DPO) program and allegations process provide channels for workers and members of the public to raise safety concerns directly with the regulator when internal channels have not been responsive.
CNSC REGDOC-2.1.2 establishes Canadian regulatory expectations for safety culture. The document identifies the key attributes of a healthy safety culture, including leadership for safety, safety is a clearly recognised value, accountability for safety, decision-making, safety communication, a questioning attitude, organisational learning, and safety consciousness. Licensees are expected to periodically assess their safety culture against these attributes and address identified weaknesses through their corrective action programs.
The IAEA safety culture framework, codified in GSR Part 2 and supported by safety guides, identifies three evolutionary stages of safety culture development: a compliance-based stage where rules are followed because they are required, a performance-based stage where improvement is actively sought, and an enhanced stage where safety culture is deeply embedded and self-sustaining. Regulators use this framework to characterise the maturity of an organisation's safety culture during inspections and performance reviews.
Forged Operations supports safety culture through transparent corrective action tracking — stop works, concerns, and near-misses all feed the same program. AI identifies patterns in how concerns are raised and resolved, giving leadership early visibility into culture indicators before they become regulatory findings.
References
- International Atomic Energy Agency. Safety Standards Series No. GSR Part 2: Leadership and Management for Safety, Requirement 1 — Leadership for Safety. Vienna: IAEA, 2016.
- Canadian Nuclear Safety Commission. REGDOC-2.1.2: Safety Culture. Ottawa: CNSC, 2018.
- American Society of Mechanical Engineers. ASME NQA-1-2022: Quality Assurance Requirements for Nuclear Facility Applications, Requirement 1 §300 — Employee Concerns. New York: ASME, 2022.
- U.S. Nuclear Regulatory Commission. "10 CFR 50.7 — Employee Protection." Code of Federal Regulations. Washington, D.C.: NRC.