What procedure should investigators follow after a detector fails during testing?

Investigators should conduct a thorough investigation if a detector fails during testing. This is crucial because the initial failure could indicate deeper underlying issues with the fire detection system or its components. By conducting a comprehensive investigation, investigators can identify the root cause of the failure, which may range from equipment malfunction to issues with installation, maintenance, or environmental interference.

An in-depth investigation will provide insights into the reliability of the system and highlight potential hazards, ensuring that corrective actions can be implemented to prevent future failures. Determining the reasons for the failure is essential for maintaining safety standards and operational integrity in powerplant environments.

The other options may not address the situation adequately; for example, simply resetting the entire system might not resolve the issue if there is a fundamental flaw, and replacing only the batteries may overlook more serious problems. Assuming it was a one-time failure could lead to a dangerous situation if the problem recurs without proper investigation and remediation.