Define stop-work authority in re-entry operations and when the Re-Entry Control Supervisor should exercise it.

• A. The authority to halt any operation that presents an unsafe condition.
• B. The authority to halt any operation that presents an unsafe condition or excessive risk; exercised whenever conditions become unsafe or a control measure fails.
• C. The authority to extend permits.
• D. The authority to revoke the Re-Entry Permit unilaterally.

Answer: (B)

Stop-work authority in re-entry operations means the Re-Entry Control Supervisor can halt all activities if conditions are unsafe, if there is excessive risk, or if a safety control measure fails. This power is there to protect workers from hazardous atmospheres, confined-space dangers, and equipment or procedure failures that could lead to injury. The best choice reflects both unsafe conditions and excessive risk, and it specifies action whenever conditions become unsafe or a control measure fails, which covers real-time changes and potential system faults. In practice, this means stopping work immediately, alerting the team, evaluating the situation, and taking corrective actions or evacuating as needed, before resuming only when it’s safe. Extensions or unilateral revocation of permits are separate decisions within permit management and are not the core stop-work authority.