Documentation updates are required after modifications or renovations.

• A. Update only drawings.
• B. Update calculations only.
• C. Do nothing.
• D. Update drawings, calculations, and operating manuals to reflect changes; re-verify design concentrations and control logic.

Answer: (D)

When a clean agent system undergoes modifications or renovations, every element that defines how the system is supposed to work needs to be kept current. That means updating the drawings to reflect the new layout and equipment, updating the calculations to account for any changes in agent quantities, room volumes, or distribution, and updating the operating manuals so procedures, alarms, interlocks, and maintenance instructions match the new configuration.

Updating drawings ensures the as-built reality matches what operators and maintenance personnel reference during normal operation and emergencies. Updating calculations keeps the design basis valid—agent quantities, hold times, and distribution assumptions must align with the changed space and components. Updating operating manuals communicates the exact procedures, control logic, testing criteria, and safety considerations for the updated system.

Because renovations can alter how the system detects, releases, and sequences action, it’s essential to re-verify design concentrations and control logic. Re-verification confirms that the system still delivers the required protective concentration for the intended hold time and that the release sequencing, interlocks, and control routines function correctly with the new configuration. This verification maintains safety margins and compliance with NFPA 2001 requirements.

So, documentation should reflect drawings, calculations, and operating manuals updated to the new state, with a fresh check of design concentrations and control logic, rather than updating only one piece or doing nothing.