What is defined as a written plan for tracking and managing refrigerants?

The correct answer is "Refrigerant management plan" because it specifically refers to a comprehensive written plan designed to track and manage refrigerants throughout their lifecycle. This plan includes protocols for the capture, recycling, and disposal of refrigerants, ensuring compliance with federal and state regulations. The importance of having a refrigerant management plan cannot be overstated, as it helps prevent leaks, reduces environmental impact, and maintains accurate records for refrigerant use and disposal, which is critical for regulatory compliance.

The other options, while potentially related to the broader subject of refrigerant management, do not encapsulate the entire scope of the tracking and management duties as effectively. A refrigerant tracking system might pertain solely to the technology or software used to monitor refrigerant levels but does not reference the comprehensive strategy needed. A service maintenance log typically records maintenance actions taken on equipment but does not necessarily capture the broader considerations of refrigerant management. Lastly, a compliance assurance plan focuses on ensuring adherence to regulations but does not specifically detail the management and tracking of refrigerants.