The primary purpose of this document is to capture the rationale used in determining the safety classification of Tank Farm systems, structures, and components (SSCs) below the level of their parent Safety SSC as identified in the Tank Farms Final Safety Analysis Report (FSAR). The intended working purpose is for all necessary and sufficient information be incorporated herein to (1) justify the safety classifications assigned, (2) enable understanding of the safety functions thus defined for any subsequent design or equipment changes, and (3) as an aid in determining the level of qualification control required for operation, maintenance, and field replacement.